1
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Reolo MJY, Otsuka M, Seow JJW, Lee J, Lee YH, Nguyen PHD, Lim CJ, Wasser M, Chua C, Lim TKH, Leow WQ, Chung A, Goh BKP, Chow PKH, DasGupta R, Yeong JPS, Chew V. CD38 marks the exhausted CD8 + tissue-resident memory T cells in hepatocellular carcinoma. Front Immunol 2023; 14:1182016. [PMID: 37377962 PMCID: PMC10292929 DOI: 10.3389/fimmu.2023.1182016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
Introduction Despite recent advances in immunotherapy for hepatocellular carcinoma (HCC), the overall modest response rate underscores the need for a better understanding of the tumor microenvironment (TME) of HCC. We have previously shown that CD38 is widely expressed on tumor-infiltrating leukocytes (TILs), predominantly on CD3+ T cells and monocytes. However, its specific role in the HCC TME remains unclear. Methods In this current study, we used cytometry time-of-flight (CyTOF), bulk RNA sequencing on sorted T cells, and single-cell RNA (scRNA) sequencing to interrogate expression of CD38 and its correlation with T cell exhaustion in HCC samples. We also employed multiplex immunohistochemistry (mIHC) for validating our findings. Results From CyTOF analysis, we compared the immune composition of CD38-expressing leukocytes in TILs, non-tumor tissue-infiltrating leukocytes (NIL), and peripheral blood mononuclear cells (PBMC). We identified CD8+ T cells as the dominant CD38-expressing TILs and found that CD38 expression was significantly higher in CD8+ TRM in TILs than in NILs. Furthermore, through transcriptomic analysis on sorted CD8+ TRM from HCC tumors, we observed a higher expression of CD38 along with T cell exhaustion genes, including PDCD1 and CTLA4, compared to the circulating memory CD8 T cells from PBMC. This was validated by scRNA sequencing that revealed co-expression of CD38 with PDCD1, CTLA4, and ITGAE (CD103) in T cells from HCC tumors. The protein co-expression of CD38 and PD-1 on CD8+ T cells was further demonstrated by mIHC on HCC FFPE tissues, marking CD38 as a T cell co-exhaustion marker in HCC. Lastly, the higher proportions of CD38+PD-1+ CD8+ T cells and CD38+PD-1+ TRM were significantly associated with the higher histopathological grades of HCC, indicating its role in the aggressiveness of the disease. Conclusion Taken together, the concurrent expression of CD38 with exhaustion markers on CD8+ TRM underpins its role as a key marker of T cell exhaustion and a potential therapeutic target for restoring cytotoxic T cell function in HCC.
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Affiliation(s)
- Marie J. Y. Reolo
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Masayuki Otsuka
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Justine Jia Wen Seow
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Joycelyn Lee
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Yun Hua Lee
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Phuong H. D. Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Tony K. H. Lim
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
| | - Wei Qiang Leow
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
| | - Alexander Chung
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, Singapore
| | - Brian K. P. Goh
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, Singapore
- SingHealth-DukeNUS Academic Surgery Program, Duke-NUS Graduate Medical School, Singapore, Singapore
| | - Pierce K. H. Chow
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, Singapore
- SingHealth-DukeNUS Academic Surgery Program, Duke-NUS Graduate Medical School, Singapore, Singapore
- Division of Medical Science, National Cancer Center, Singapore, Singapore
| | - Ramanuj DasGupta
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Joe Poh Sheng Yeong
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
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2
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Cheung CCL, Seah YHJ, Fang J, Orpilla NHC, Lau MC, Lim CJ, Lim X, Lee JNLW, Lim JCT, Lim S, Cheng Q, Toh HC, Choo SP, Lee SY, Lee JJX, Liu J, Lim TKH, Tai D, Yeong J. Immunohistochemical scoring of LAG-3 in conjunction with CD8 in the tumor microenvironment predicts response to immunotherapy in hepatocellular carcinoma. Front Immunol 2023; 14:1150985. [PMID: 37342338 PMCID: PMC10277502 DOI: 10.3389/fimmu.2023.1150985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 05/04/2023] [Indexed: 06/22/2023] Open
Abstract
Introduction Immune checkpoint blockade (ICB) is a systemic therapeutic option for advanced hepatocellular carcinoma (HCC). However, low patient response rates necessitate the development of robust predictive biomarkers that identify individuals who will benefit from ICB. A 4-gene inflammatory signature, comprising CD8, PD-L1, LAG-3, and STAT1, was recently shown to be associated with a better overall response to ICB in various cancer types. Here, we examined whether tissue protein expression of CD8, PD-L1, LAG-3, and STAT1 predicts response to ICB in HCC. Methods HCC samples from 191 Asian patients, comprising resection specimens from 124 patients (ICB-naïve) and pre-treatment specimens from 67 advanced HCC patients treated with ICB (ICB-treated), were analyzed for CD8, PD-L1, LAG-3, and STAT1 tissue expression using multiplex immunohistochemistry followed by statistical and survival analyses. Results Immunohistochemical and survival analyses of ICB-naïve samples showed that high LAG-3 expression was associated with shorter median progression-free survival (mPFS) and overall survival (mOS). Analysis of ICB-treated samples revealed that high proportions of LAG-3+ and LAG-3+CD8+ cells pre-treatment were most closely associated with longer mPFS and mOS. Using a log-likelihood model, adding the total LAG-3+ cell proportion to the total CD8+ cell proportion significantly increased the predictive values for mPFS and mOS, compared with the total CD8+ cell proportion alone. Moreover, levels of CD8 and STAT1, but not PD-L1, were significantly correlated with better responses to ICB. After analyzing viral-related and non-viral HCC samples separately, only the LAG3+CD8+ cell proportion was significantly associated with responses to ICB regardless of viral status. Conclusion Immunohistochemical scoring of pre-treatment levels of LAG-3 and CD8 in the tumor microenvironment may help predict ICB benefits in HCC patients. Furthermore, immunohistochemistry-based techniques offer the advantage of being readily translatable in the clinical setting.
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Affiliation(s)
- Chun Chau Lawrence Cheung
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Duke-NUS Medical School, Singapore, Singapore
| | - Yong Hock Justin Seah
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Juntao Fang
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | | | - Mai Chan Lau
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Chun Jye Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Xinru Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Justina Nadia Li Wen Lee
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Jeffrey Chun Tatt Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Sherlly Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Qing Cheng
- Duke-NUS Medical School, Singapore, Singapore
- Center of Statistical Research, School of Statistics, Southwestern University of Finance and Economics, Chengdu, Sichuan, China
| | - Han Chong Toh
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Su Pin Choo
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Suat Ying Lee
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Joycelyn Jie Xin Lee
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Jin Liu
- Duke-NUS Medical School, Singapore, Singapore
| | - Tony Kiat Hon Lim
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Duke-NUS Medical School, Singapore, Singapore
| | - David Tai
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Joe Yeong
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Duke-NUS Medical School, Singapore, Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
- Singapore Immunology Network (SIgN), Agency of Science, Technology, and Research (A*STAR), Singapore, Singapore
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3
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Lee YH, Chuah S, Nguyen PHD, Lim CJ, Lai HLH, Wasser M, Chua C, Lim TKH, Leow WQ, Loh TJ, Wan WK, Pang YH, Soon G, Cheow PC, Kam JH, Iyer S, Kow A, Bonney GK, Chan CY, Chung A, Goh BKP, Zhai W, Chow PKH, Albani S, Liu H, Chew V. IFNγ -IL-17 + CD8 T cells contribute to immunosuppression and tumor progression in human hepatocellular carcinoma. Cancer Lett 2023; 552:215977. [PMID: 36279983 DOI: 10.1016/j.canlet.2022.215977] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/12/2022] [Accepted: 10/18/2022] [Indexed: 11/07/2022]
Abstract
IL-17-producing CD8 (Tc17) T cells have been shown to play an important role in infection and chronic inflammation, however their implications in hepatocellular carcinoma (HCC) remain elusive. In this study, we performed cytometry by time-of-flight (CyTOF) and revealed the distinctive immunological phenotypes of two IFNγ+ and IFNγ- Tc17 subsets that were preferentially enriched in human HCC. Single-cell RNA-sequencing analysis further revealed regulatory circuits governing the different phenotypes of these Tc17 subsets. In particular, we discovered that IFNγ- Tc17 subset demonstrated pro-tumoral characteristics and expressed higher levels of CCL20. This corresponded to increased tumor infiltration of T regulatory cells (Treg) validated by immunohistochemistry in another independent HCC cohort, demonstrating the immunosuppressive functions of IFNγ- Tc17 subset. Most importantly, higher intra-tumoral proportions of IFNγ- Tc17 were associated with poorer prognosis in patients with HCC and this was further validated in The Cancer Genome Atlas (TCGA) HCC cohort. Taken together, this compendium of transcriptomic and proteomic data of Tc17 subsets sheds light on the immunosuppressive phenotypes of IFNγ- Tc17 and its implications in HCC progression.
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Affiliation(s)
- Yun Hua Lee
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Samuel Chuah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Phuong H D Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Hannah L H Lai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Tony K H Lim
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Wei Qiang Leow
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Tracy Jiezhen Loh
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Wei Keat Wan
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Yin Huei Pang
- Department of Pathology, National University Hospital Singapore, 119074, Singapore
| | - Gwyneth Soon
- Department of Pathology, National University Hospital Singapore, 119074, Singapore
| | - Peng Chung Cheow
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Juinn Huar Kam
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Shridhar Iyer
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Alfred Kow
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Glenn K Bonney
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Chung Yip Chan
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Alexander Chung
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Brian K P Goh
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Weiwei Zhai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore; Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100107, China; Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, Yunan, 650223, China
| | - Pierce K H Chow
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Haiyan Liu
- Immunology Programme, Life Sciences Institute, Immunology Translational Research Program and Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117456, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore.
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4
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Suthen S, Lim CJ, Nguyen PHD, Dutertre CA, Lai HLH, Wasser M, Chua C, Lim TKH, Leow WQ, Loh TJ, Wan WK, Pang YH, Soon G, Cheow PC, Kam JH, Iyer S, Kow A, Tam WL, Shuen TWH, Toh HC, Dan YY, Bonney GK, Chan CY, Chung A, Goh BKP, Zhai W, Ginhoux F, Chow PKH, Albani S, Chew V. Hypoxia-driven immunosuppression by Treg and type-2 conventional dendritic cells in HCC. Hepatology 2022; 76:1329-1344. [PMID: 35184329 DOI: 10.1002/hep.32419] [Citation(s) in RCA: 63] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/25/2022] [Accepted: 02/07/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND AND AIMS Hypoxia is one of the central players in shaping the immune context of the tumor microenvironment (TME). However, the complex interplay between immune cell infiltrates within the hypoxic TME of HCC remains to be elucidated. APPROACH AND RESULTS We analyzed the immune landscapes of hypoxia-low and hypoxia-high tumor regions using cytometry by time of light, immunohistochemistry, and transcriptomic analyses. The mechanisms of immunosuppression in immune subsets of interest were further explored using in vitro hypoxia assays. Regulatory T cells (Tregs) and a number of immunosuppressive myeloid subsets, including M2 macrophages and human leukocyte antigen-DR isotype (HLA-DRlo ) type 2 conventional dendritic cell (cDC2), were found to be significantly enriched in hypoxia-high tumor regions. On the other hand, the abundance of active granzyme Bhi PD-1lo CD8+ T cells in hypoxia-low tumor regions implied a relatively active immune landscape compared with hypoxia-high regions. The up-regulation of cancer-associated genes in the tumor tissues and immunosuppressive genes in the tumor-infiltrating leukocytes supported a highly pro-tumorigenic network in hypoxic HCC. Chemokine genes such as CCL20 (C-C motif chemokine ligand 20) and CXCL5 (C-X-C motif chemokine ligand 5) were associated with recruitment of both Tregs and HLA-DRlo cDC2 to hypoxia-high microenvironments. The interaction between Tregs and cDC2 under a hypoxic TME resulted in a loss of antigen-presenting HLA-DR on cDC2. CONCLUSIONS We uncovered the unique immunosuppressive landscapes and identified key immune subsets enriched in hypoxic HCC. In particular, we identified a potential Treg-mediated immunosuppression through interaction with a cDC2 subset in HCC that could be exploited for immunotherapies.
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Affiliation(s)
- Sheena Suthen
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Phuong H D Nguyen
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Charles-Antoine Dutertre
- Gustave Roussy Cancer Campus, Villejuif, France.,Institut National de la Santé Et de la Recherche Médicale (INSERM) U1015, Equipe Labellisée-Ligue Nationale Contre le Cancer, Villejuif, France
| | - Hannah L H Lai
- Agency for Science, Technology and Research, Genome Institute of Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Camillus Chua
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Tony K H Lim
- Duke-NUS Medical School, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore
| | - Wei Qiang Leow
- Duke-NUS Medical School, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore
| | - Tracy Jiezhen Loh
- Duke-NUS Medical School, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore
| | - Wei Keat Wan
- Duke-NUS Medical School, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore
| | - Yin Huei Pang
- Department of Pathology, National University Hospital, Singapore
| | - Gwyneth Soon
- Department of Pathology, National University Hospital, Singapore
| | - Peng Chung Cheow
- Duke-NUS Medical School, Singapore.,Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore
| | - Juinn Huar Kam
- Duke-NUS Medical School, Singapore.,Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore
| | - Shridhar Iyer
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore
| | - Alfred Kow
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore
| | - Wai Leong Tam
- Agency for Science, Technology and Research, Genome Institute of Singapore, Singapore.,School of Biological Sciences, Nanyang Technological University, Singapore.,Cancer Science Institute of Singapore, National University of Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Timothy W H Shuen
- Division of Medical Oncology, National Cancer Center Singapore, Singapore
| | - Han Chong Toh
- Duke-NUS Medical School, Singapore.,Division of Medical Oncology, National Cancer Center Singapore, Singapore
| | - Yock Young Dan
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Glenn K Bonney
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore
| | - Chung Yip Chan
- Duke-NUS Medical School, Singapore.,Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore
| | - Alexander Chung
- Duke-NUS Medical School, Singapore.,Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore
| | - Brian K P Goh
- Duke-NUS Medical School, Singapore.,Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore
| | - Weiwei Zhai
- Gustave Roussy Cancer Campus, Villejuif, France.,Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China
| | - Florent Ginhoux
- Gustave Roussy Cancer Campus, Villejuif, France.,Institut National de la Santé Et de la Recherche Médicale (INSERM) U1015, Equipe Labellisée-Ligue Nationale Contre le Cancer, Villejuif, France
| | - Pierce K H Chow
- Division of Surgery and Surgical Oncology, Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital and National Cancer Center Singapore, Singapore.,Academic Clinical Programme for Surgery, SingHealth Duke-NUS Academic Medical Centre, Singapore
| | - Salvatore Albani
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
| | - Valerie Chew
- Translational Immunology Institute, SingHealth Duke-NUS Academic Medical Center, Singapore
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5
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Lau MC, Yi Y, Goh D, Cheung CCL, Tan B, Lim JCT, Joseph CR, Wee F, Lee JN, Lim X, Lim CJ, Leow WQ, Lee JY, Ng CCY, Bashiri H, Cheow PC, Chan CY, Koh YX, Tan TT, Kalimuddin S, Tai WMD, Ng JL, Low JGH, Lim TKH, Liu J, Yeong JPS. Case report: Understanding the impact of persistent tissue-localization of SARS-CoV-2 on immune response activity via spatial transcriptomic analysis of two cancer patients with COVID-19 co-morbidity. Front Immunol 2022; 13:978760. [PMID: 36172383 PMCID: PMC9510984 DOI: 10.3389/fimmu.2022.978760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 08/26/2022] [Indexed: 11/13/2022] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has infected half a billion people, including vulnerable populations such as cancer patients. While increasing evidence supports the persistence of SARS-CoV-2 months after a negative nasopharyngeal swab test, the effects on long-term immune memory and cancer treatment are unclear. In this report, we examined post-COVID-19 tissue-localized immune responses in a hepatocellular carcinoma (HCC) patient and a colorectal cancer (CRC) patient. Using spatial whole-transcriptomic analysis, we demonstrated spatial profiles consistent with a lymphocyte-associated SARS-CoV-2 response (based on two public COVID-19 gene sets) in the tumors and adjacent normal tissues, despite intra-tumor heterogeneity. The use of RNAscope and multiplex immunohistochemistry revealed that the spatial localization of B cells was significantly associated with lymphocyte-associated SARS-CoV-2 responses within the spatial transcriptomic (ST) niches showing the highest levels of virus. Furthermore, single-cell RNA sequencing data obtained from previous (CRC) or new (HCC) ex vivo stimulation experiments showed that patient-specific SARS-CoV-2 memory B cells were the main contributors to this positive association. Finally, we evaluated the spatial associations between SARS-CoV-2-induced immunological effects and immunotherapy-related anti-tumor immune responses. Immuno-predictive scores (IMPRES) revealed consistent positive spatial correlations between T cells/cytotoxic lymphocytes and the predicted immune checkpoint blockade (ICB) response, particularly in the HCC tissues. However, the positive spatial correlation between B cells and IMPRES score was restricted to the high-virus ST niche. In addition, tumor immune dysfunction and exclusion (TIDE) analysis revealed marked T cell dysfunction and inflammation, alongside low T cell exclusion and M2 tumor-associated macrophage infiltration. Our results provide in situ evidence of SARS-CoV-2-generated persistent immunological memory, which could not only provide tissue protection against reinfection but may also modulate the tumor microenvironment, favoring ICB responsiveness. As the number of cancer patients with COVID-19 comorbidity continues to rise, improved understanding of the long-term immune response induced by SARS-CoV-2 and its impact on cancer treatment is much needed.
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Affiliation(s)
- Mai Chan Lau
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yang Yi
- Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
| | - Denise Goh
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chun Chau Lawrence Cheung
- Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
| | - Benedict Tan
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Jeffrey Chun Tatt Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Craig Ryan Joseph
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Felicia Wee
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Justina Nadia Lee
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Xinru Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chun Jye Lim
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Wei Qiang Leow
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
| | - Jing Yi Lee
- Department of Infectious Diseases, Singapore General Hospital, Singapore, Singapore
| | | | - Hamed Bashiri
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Peng Chung Cheow
- Cancer Discovery Hub, National Cancer Centre Singapore, Singapore, Singapore
| | - Chun Yip Chan
- Cancer Discovery Hub, National Cancer Centre Singapore, Singapore, Singapore
| | - Ye Xin Koh
- Cancer Discovery Hub, National Cancer Centre Singapore, Singapore, Singapore
| | - Thuan Tong Tan
- Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Shirin Kalimuddin
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Wai Meng David Tai
- National Cancer Centre Singapore, Division of Medical Oncology, Singapore, Singapore
| | - Jia Lin Ng
- Department of Colorectal Surgery, Singapore General Hospital, Singapore, Singapore
| | - Jenny Guek-Hong Low
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Tony Kiat Hon Lim
- Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- *Correspondence: Joe Poh Sheng Yeong, ; Jin Liu, ; Tony Kiat Hon Lim,
| | - Jin Liu
- Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
- *Correspondence: Joe Poh Sheng Yeong, ; Jin Liu, ; Tony Kiat Hon Lim,
| | - Joe Poh Sheng Yeong
- Institute of Molecular and Cell Biology (IMCB), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore
- Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, Singapore
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
- *Correspondence: Joe Poh Sheng Yeong, ; Jin Liu, ; Tony Kiat Hon Lim,
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6
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Chuah S, Lee J, Song Y, Kim HD, Wasser M, Kaya NA, Bang K, Lee YJ, Jeon SH, Suthen S, A'Azman S, Gien G, Lim CJ, Chua C, Hazirah SN, Lee HK, Lim JQ, Lim TKH, Yeong J, Chen J, Shin EC, Albani S, Zhai W, Yoo C, Liu H, Choo SP, Tai D, Chew V. Uncoupling immune trajectories of response and adverse events from anti-PD-1 immunotherapy in hepatocellular carcinoma. J Hepatol 2022; 77:683-694. [PMID: 35430299 DOI: 10.1016/j.jhep.2022.03.039] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 03/27/2022] [Accepted: 03/31/2022] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS While immune checkpoint blockade (ICB) has shown promise in patients with hepatocellular carcinoma (HCC), it is associated with modest response rates and immune-related adverse events (irAEs) are common. In this study, we aimed to decipher immune trajectories and mechanisms of response and/or irAEs in patients with HCC receiving anti-programmed cell death 1 (anti-PD-1) therapy. METHODS Pre- and on-treatment peripheral blood samples (n = 60) obtained from 32 patients with HCC (Singapore cohort) were analysed by cytometry by time-of-flight and single-cell RNA sequencing, with flow cytometric validation in an independent Korean cohort (n = 29). Mechanistic validation was conducted by bulk RNA sequencing of 20 pre- and on-treatment tumour biopsies and using a murine HCC model treated with different immunotherapeutic combinations. RESULTS Single-cell analyses identified CXCR3+CD8+ effector memory T (TEM) cells and CD11c+ antigen-presenting cells (APC) as associated with response (p = 0.0004 and 0.0255, respectively), progression-free survival (p = 0.00079 and 0.0015, respectively), and irAEs (p = 0.0034 and 0.0125, respectively) in anti-PD-1-treated patients with HCC. Type-1 conventional dendritic cells were identified as the specific APC associated with response, while 2 immunosuppressive CD14+ myeloid clusters were linked to reduced irAEs. Further analyses of CXCR3+CD8+ TEM cells showed cell-cell interactions specific to response vs. irAEs, from which the anti-PD-1 and anti-TNFR2 combination was harnessed to uncouple these effects, resulting in enhanced response without increased irAEs in a murine HCC model. CONCLUSIONS This study identifies early predictors of clinical response to anti-PD-1 ICB in patients with HCC and offers mechanistic insights into the immune trajectories of these immune subsets at the interface between response and toxicity. We also propose a new combination immunotherapy for HCC to enhance response without exacerbating irAEs. CLINICAL TRIAL NUMBER NCT03695952. LAY SUMMARY Response rates to immune checkpoint blockade (ICB) treatment in hepatocellular carcinoma (HCC) remain modest and adverse events are common. Herein, we identified early predictors of response and gained an in-depth understanding of the immunological mechanisms behind response and adverse events in patients with HCC treated with ICB. We also proposed a new combination immunotherapy for HCC that enhances response without exacerbating adverse events.
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Affiliation(s)
- Samuel Chuah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Joycelyn Lee
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore
| | - Yuan Song
- Immunology Programme, Life Sciences Institute, Immunology Translational Research Program and Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
| | - Hyung-Don Kim
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore
| | - Neslihan A Kaya
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Kyunghye Bang
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Yong Joon Lee
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Sheena Suthen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Shamirah A'Azman
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Gerald Gien
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Sharifah Nur Hazirah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Hong Kai Lee
- Singapore Immunology Network (SIgN), A∗STAR, Singapore 138648, Singapore
| | - Jia Qi Lim
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore
| | - Tony K H Lim
- Duke-NUS Medical School, Singapore 169857, Singapore; Department of Anatomical Pathology, Singapore General Hospital (SGH), Singapore 169856, Singapore
| | - Joe Yeong
- Duke-NUS Medical School, Singapore 169857, Singapore; Department of Anatomical Pathology, Singapore General Hospital (SGH), Singapore 169856, Singapore; Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Jinmiao Chen
- Singapore Immunology Network (SIgN), A∗STAR, Singapore 138648, Singapore
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore
| | - Weiwei Zhai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore; Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100107, China; Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650223, China
| | - Changhoon Yoo
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Haiyan Liu
- Immunology Programme, Life Sciences Institute, Immunology Translational Research Program and Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
| | - Su Pin Choo
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore; Curie Oncology, Mount Elizabeth Novena Specialist Centre, Singapore 329563, Singapore
| | - David Tai
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore.
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore.
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7
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Tam A, Kulkarni J, An K, Li L, Dorscheid DR, Singhera GK, Bernatchez P, Reid G, Chan K, Witzigmann D, Cullis PR, Sin DD, Lim CJ. Lipid nanoparticle formulations for optimal RNA-based topical delivery to murine airways. Eur J Pharm Sci 2022; 176:106234. [PMID: 35688311 DOI: 10.1016/j.ejps.2022.106234] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Lipid nanoparticles (LNP) have been successfully used as a platform technology for delivering nucleic acids to the liver. To broaden the application of LNPs in targeting non-hepatic tissues, we developed LNP-based RNA therapies (siRNA or mRNA) for the respiratory tract. Such optimized LNP systems could offer an early treatment strategy for viral respiratory tract infections such as COVID-19. METHODS We generated a small library of six LNP formulations with varying helper lipid compositions and characterized their hydrodynamic diameter, size distribution and cargo entrapment properties. Next, we screened these LNP formulations for particle uptake and evaluated their potential for transfecting mRNA encoding green fluorescence protein (GFP) or SARS-CoV2 nucleocapsid-GFP fusion reporter gene in a human airway epithelial cell line in vitro. Following LNP-siGFP delivery, GFP protein knockdown efficiency was assessed by flow cytometry to determine %GFP+ cells and median fluorescence intensity (MFI) for GFP. Finally, lead LNP candidates were validated in Friend leukemia virus B (FVB) male mice via intranasal delivery of an mRNA encoding luciferase, using in vivo bioluminescence imaging. RESULTS Dynamic light scattering revealed that all LNP formulations contained particles with an average diameter of <100 nm and a polydispersity index of <0.2. Human airway epithelial cell lines in culture internalized LNPs with differential GFP transfection efficiencies (73-97%). The lead formulation LNP6 entrapping GFP or Nuc-GFP mRNA demonstrated the highest transfection efficiency (97%). Administration of LNP-GFP siRNA resulted in a significant reduction of GFP protein expression. For in vivo studies, intranasal delivery of LNPs containing helper lipids (DSPC, DOPC, ESM or DOPS) with luciferase mRNA showed significant increase in luminescence expression in nasal cavity and lungs by at least 10 times above baseline control. CONCLUSION LNP formulations enable the delivery of RNA payloads into human airway epithelial cells, and in the murine respiratory system; they can be delivered to nasal mucosa and lower respiratory tract via intranasal delivery. The composition of helper lipids in LNPs crucially modulates transfection efficiencies in airway epithelia, highlighting their importance in effective delivery of therapeutic products for airways diseases.
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Affiliation(s)
- A Tam
- NanoVation Therapeutics Inc. Vancouver, British Columbia, Canada; Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, University of British Columbia Vancouver, British Columbia, Canada; University of British Columbia (UBC) Center for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - J Kulkarni
- NanoVation Therapeutics Inc. Vancouver, British Columbia, Canada; NanoMedicines Innovation Network, Vancouver, British Columbia, Canada; University of British Columbia (UBC), Department of Biochemistry and Molecular Biology, Vancouver, British Columbia, Canada
| | - K An
- NanoVation Therapeutics Inc. Vancouver, British Columbia, Canada; University of British Columbia (UBC), Department of Biochemistry and Molecular Biology, Vancouver, British Columbia, Canada
| | - L Li
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, University of British Columbia Vancouver, British Columbia, Canada
| | - D R Dorscheid
- University of British Columbia (UBC) Center for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - G K Singhera
- University of British Columbia (UBC) Center for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada; Department of Medicine (Division of Respirology), UBC, Vancouver, British Columbia, Canada
| | - P Bernatchez
- University of British Columbia (UBC) Center for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada; Department of Medicine (Division of Respirology), UBC, Vancouver, British Columbia, Canada; Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, 217-2176 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Gsd Reid
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, University of British Columbia Vancouver, British Columbia, Canada
| | - Kyt Chan
- NanoMedicines Innovation Network, Vancouver, British Columbia, Canada; University of British Columbia (UBC), Department of Biochemistry and Molecular Biology, Vancouver, British Columbia, Canada
| | - D Witzigmann
- NanoVation Therapeutics Inc. Vancouver, British Columbia, Canada; NanoMedicines Innovation Network, Vancouver, British Columbia, Canada; University of British Columbia (UBC), Department of Biochemistry and Molecular Biology, Vancouver, British Columbia, Canada
| | - P R Cullis
- NanoVation Therapeutics Inc. Vancouver, British Columbia, Canada; NanoMedicines Innovation Network, Vancouver, British Columbia, Canada; University of British Columbia (UBC), Department of Biochemistry and Molecular Biology, Vancouver, British Columbia, Canada
| | - D D Sin
- University of British Columbia (UBC) Center for Heart Lung Innovation, St. Paul's Hospital, Vancouver, British Columbia, Canada
| | - C J Lim
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, University of British Columbia Vancouver, British Columbia, Canada.
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8
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Chung KKI, Lim CJ. Gender, ethnic difference in arrhythmic risks and prognosis in patients with non-ischaemic cardiomyopathy. Europace 2022. [DOI: 10.1093/europace/euac053.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
The mortality benefits of Automatic Intracardiac Defibrillator (AICD) in non-ischaemic cardiomyopathy patients is less clear. Subgroup analysis of Definite trial showed that female patients favoured medical treatment. Ethnic difference in arrhythmic risk also not known.
Method
447 patients with heart failure and reduced left ventricular ejection fraction (LVEF <40%) due to non-ischemic cardiomyopathy, all have coronary angiogram to exclude significant coronary artery disease (>70% stenosis).
Continuous variables were compared by Student t tests and categorical variables compared by use of the Fisher exact test. Composite endpoints include death, sudden cardiac death (SCD), ventricular arrhythmias (VA ) and hospitalisations for heart failure. P<0.05 was denoted as statistical significant.
Results
Mean age 63.07 ± 14.19 years, male patients 314 (70%), 360 Chinese and 87 non-chinese. Mean age of male and female patients were 61.21 ± 13.65 and 67.46 ± 14.52 years old respectively. Patients with diabetes mellitus 38%, hypertension 76%, atrial fibrillation 38%, stroke 9%. LDL 2.78 ± 1.04 mmol/l, HbA1c 6.56 ± 1.62%, baseline creatinine 98.43 ± 37.27umol/l. Patients taking ivabradine 9%, b-blocker 88%, Angiotensin inhibitors/Angiotensin Receptor Blocker 66%, Sacubitrial/ Valsartan 26%, spironolactone 57%, SGLT-2 inhibitor 9%.
Mean follow-up duration of 6.18 ± 4.16 years. There were 61 deaths (13%, 2.20% death/ year, 20 females and 41 males). 38 SCD, 22 VA, 218 hospitalisation for heart failure
There was a significant increase in LVEF from 24.88 ± 8.17 to 39.92 ± 13.88% and 22.05 ± 8.52 to 36.14 ± 8.17 % in female and male patients respectively (p=0.023). 190 patients (43%) have LVEF increased to or more than 35%.
40 patients (9%) received device therapy (AICD and Cardiac resynchronization therapy), 19% secondary prevention, 81% for primary prevention. The median time from diagnosis of NICMP to appropriate device therapy for VT/ VT storms was 85.5 months (interquartile range 35-131). 18/21 patients (86%) noted to have appropriate therapy for VT/ VT storms were males. HR for males 8, 95% CI (1.06, 60.34, p=0.044). All the device therapy occurred in patients with LVEF< 35%. There is also gender difference in composite endpoints (p=0.0022)
LVEF improved from 23.31± 8.67 to 38.10 ±15.20 and 21.63 ±7.57 to 33.74 ±12.92% respectively (p=0.014) in Chinese and non-Chinese patients respectively. There are no significant difference in the VA or primary composite endpoints.
Conclusions
The study showed progressive improvement of the therapeutic regimens improve mortality by improving LVEF regardless of gender or ethnicity. The ventricular tachyarrhythmic risk, composite endpoints are significantly higher in male than female patients with non-ischaemic cardiomyopathy. There is no ethnic difference in clinical endpoints.
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Affiliation(s)
- KKI Chung
- Tan Tock Seng Hospital, Singapore, Singapore
| | - CJ Lim
- Tan Tock Seng Hospital, Singapore, Singapore
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9
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Nguyen PHD, Wasser M, Tan CT, Lim CJ, Lai HLH, Seow JJW, DasGupta R, Phua CZJ, Ma S, Yang J, Suthen SD, Tam WL, Lim TKH, Yeong J, Leow WQ, Pang YH, Soon G, Loh TJ, Wan WK, Chan CY, Cheow PC, Toh HC, Kow A, Dan YY, Kam JH, Iyer S, Madhavan K, Chung A, Bonney GK, Goh BKP, Fu N, Yu VC, Zhai W, Albani S, Chow PKH, Chew V. Trajectory of immune evasion and cancer progression in hepatocellular carcinoma. Nat Commun 2022; 13:1441. [PMID: 35301339 PMCID: PMC8931110 DOI: 10.1038/s41467-022-29122-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 02/17/2022] [Indexed: 12/15/2022] Open
Abstract
Immune evasion is key to cancer initiation and later at metastasis, but its dynamics at intermediate stages, where potential therapeutic interventions could be applied, is undefined. Here we show, using multi-dimensional analyses of resected tumours, their adjacent non-tumour tissues and peripheral blood, that extensive immune remodelling takes place in patients with stage I to III hepatocellular carcinoma (HCC). We demonstrate the depletion of anti-tumoural immune subsets and accumulation of immunosuppressive or exhausted subsets along with reduced tumour infiltration of CD8 T cells peaking at stage II tumours. Corresponding transcriptomic modification occur in the genes related to antigen presentation, immune responses, and chemotaxis. The progressive immune evasion is validated in a murine model of HCC. Our results show evidence of ongoing tumour-immune co-evolution during HCC progression and offer insights into potential interventions to reverse, prevent or limit the progression of the disease.
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Affiliation(s)
- Phuong H D Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore.,Duke-Nus Medical School, Singapore, 169857, Singapore
| | - Chong Teik Tan
- Department of Pharmacy, National University of Singapore, Singapore, 117559, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Hannah L H Lai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Justine Jia Wen Seow
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Ramanuj DasGupta
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Cheryl Z J Phua
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Siming Ma
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore
| | - Jicheng Yang
- Duke-Nus Medical School, Singapore, 169857, Singapore
| | - Sheena D/O Suthen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore
| | - Wai Leong Tam
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore.,School of Biological Sciences, Nanyang Technological University, Singapore, 637551, Singapore.,Cancer Science Institute of Singapore, National University of Singapore, Singapore, 117599, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117596, Singapore
| | - Tony K H Lim
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Joe Yeong
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore.,Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, 138673, Singapore
| | - Wei Qiang Leow
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Yin Huei Pang
- Department of Pathology, National University Hospital, Singapore, 119074, Singapore
| | - Gwyneth Soon
- Department of Pathology, National University Hospital, Singapore, 119074, Singapore
| | - Tracy Jiezhen Loh
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Wei Keat Wan
- Department of Anatomical Pathology, Singapore General Hospital, Singapore, 169856, Singapore
| | - Chung Yip Chan
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Peng Chung Cheow
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Han Chong Toh
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Division of Medical Oncology, National Cancer Centre Singapore, Singapore, 169610, Singapore
| | - Alfred Kow
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Yock Young Dan
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117597, Singapore
| | - Juinn Huar Kam
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Shridhar Iyer
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Krishnakumar Madhavan
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Alexander Chung
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Glenn K Bonney
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, 119074, Singapore
| | - Brian K P Goh
- Duke-Nus Medical School, Singapore, 169857, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore
| | - Naiyang Fu
- Duke-Nus Medical School, Singapore, 169857, Singapore
| | - Victor C Yu
- Department of Pharmacy, National University of Singapore, Singapore, 117559, Singapore
| | - Weiwei Zhai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, 138672, Singapore.,Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100107, China.,Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, Yunan, 650223, China
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore. .,Duke-Nus Medical School, Singapore, 169857, Singapore.
| | - Pierce K H Chow
- Department of Hepatopancreatobiliary and Transplant Surgery, Division of Surgery and Surgical Oncology, Singapore General Hospital and National Cancer Centre Singapore, Singapore, 169608, Singapore. .,Academic Clinical Programme for Surgery, SingHealth Duke-NUS Academic Medical Centre (AMC), Singapore, 169857, Singapore.
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, 169856, Singapore. .,Duke-Nus Medical School, Singapore, 169857, Singapore.
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10
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Nguyen PHD, Ma S, Phua CZJ, Kaya NA, Lai HLH, Lim CJ, Lim JQ, Wasser M, Lai L, Tam WL, Lim TKH, Wan WK, Loh T, Leow WQ, Pang YH, Chan CY, Lee SY, Cheow PC, Toh HC, Ginhoux F, Iyer S, Kow AWC, Young Dan Y, Chung A, Bonney GK, Goh BKP, Albani S, Chow PKH, Zhai W, Chew V. Author Correction: Intratumoural immune heterogeneity as a hallmark of tumour evolution and progression in hepatocellular carcinoma. Nat Commun 2021; 12:1372. [PMID: 33623020 PMCID: PMC7902808 DOI: 10.1038/s41467-021-21556-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- Phuong H D Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Siming Ma
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Cheryl Z J Phua
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Neslihan A Kaya
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,School of Biological Sciences, Nanyang Technological University Singapore, Singapore, Singapore
| | - Hannah L H Lai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Jia Qi Lim
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Liyun Lai
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Wai Leong Tam
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,School of Biological Sciences, Nanyang Technological University Singapore, Singapore, Singapore.,Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Tony K H Lim
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Wei Keat Wan
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Tracy Loh
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Wei Qiang Leow
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Yin Huei Pang
- Department of Pathology, National University Hospital Singapore, Singapore, Singapore
| | - Chung Yip Chan
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Ser Yee Lee
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Peng Chung Cheow
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Han Chong Toh
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore
| | - Florent Ginhoux
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore.,Singapore Immunology Network (SIgN), A*STAR, Singapore, Singapore
| | - Shridhar Iyer
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Alfred W C Kow
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Yock Young Dan
- Department of Medicine, Yong Loo Lin School of Medicine, National University Hospital Singapore, Singapore, Singapore
| | - Alexander Chung
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Glen K Bonney
- Division of Hepatobiliary & Pancreatic Surgery, Department of Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Brian K P Goh
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Pierce K H Chow
- Duke-NUS Medical School, Singapore, Singapore. .,National Cancer Centre, Singapore, Singapore. .,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore.
| | - Weiwei Zhai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore. .,Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China. .,Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China.
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore.
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11
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Lim CJ, Nguyen PHD, Wasser M, Kumar P, Lee YH, Nasir NJM, Chua C, Lai L, Hazirah SN, Loh JJH, Khor LY, Yeong J, Lim TKH, Low AWX, Albani S, Chong TW, Chew V. Immunological Hallmarks for Clinical Response to BCG in Bladder Cancer. Front Immunol 2021; 11:615091. [PMID: 33584702 PMCID: PMC7879685 DOI: 10.3389/fimmu.2020.615091] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 12/10/2020] [Indexed: 12/13/2022] Open
Abstract
Intravesical Bacillus Calmette-Guerin (BCG) is an effective immunotherapy for non-muscle invasive bladder cancer (NMIBC). However, recurrence and progression remain frequent warranting deeper insights into its mechanism. We herein comprehensively profiled blood and tissues obtained from NMIBC patients before, during and after BCG treatment using cytometry by time-of-flight (CyTOF) and RNA sequencing to identify the key immune subsets crucial for anti-tumor activity. We observed the temporal changes of peripheral immune subsets including NKT cells, central memory CD4+ T cells, CD8+ T cells and regulatory T cells (Treg) during the course of BCG. Gene expression analysis revealed enriched immune pathways involving in T cell activation and chemotaxis, as well as a more diversified T cell receptor repertoire in post-BCG tissues. Moreover, tissue multiplexed-immunofluorescence (mIF) showed baseline densities of non-Treg and CD8+PD-1+ T cells were predictive of response and better recurrence-free survival after BCG. Remarkably, post-BCG tissues from responders were found to be infiltrated with more active CD8+PD-1- T cells and non-Treg CD4+FOXP3- T cells; but increased exhausted CD8+PD-1+ T cells were found in non-responders. Taken together, we identified predictive biomarkers for response and uncovered the post-treatment expansion of exhausted PD-1+CD8+ T cells as key to BCG resistance, which could potentially be restored by combining with anti-PD-1 immunotherapy.
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Affiliation(s)
- Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Phuong Hoang Diem Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Pavanish Kumar
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Yun Hua Lee
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Nurul Jannah Mohamed Nasir
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Liyun Lai
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Sharifah Nur Hazirah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Josh Jie Hua Loh
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Li Yan Khor
- Duke-NUS Medical School, Singapore, Singapore.,Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Joe Yeong
- Division of Pathology, Singapore General Hospital, Singapore, Singapore.,Institute of Molecular Cell Biology (IMCB), Agency of Science, Technology and Research (ASTAR), Singapore, Singapore
| | - Tony Kiat Hon Lim
- Duke-NUS Medical School, Singapore, Singapore.,Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | | | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Tsung Wen Chong
- Duke-NUS Medical School, Singapore, Singapore.,Department of Urology, Singapore General Hospital, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
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12
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Nguyen PHD, Ma S, Phua CZJ, Kaya NA, Lai HLH, Lim CJ, Lim JQ, Wasser M, Lai L, Tam WL, Lim TKH, Wan WK, Loh T, Leow WQ, Pang YH, Chan CY, Lee SY, Cheow PC, Toh HC, Ginhoux F, Iyer S, Kow AWC, Young Dan Y, Chung A, Goh BKP, Albani S, Chow PKH, Zhai W, Chew V, Chew V. Intratumoural immune heterogeneity as a hallmark of tumour evolution and progression in hepatocellular carcinoma. Nat Commun 2021; 12:227. [PMID: 33431814 PMCID: PMC7801667 DOI: 10.1038/s41467-020-20171-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 11/18/2020] [Indexed: 02/06/2023] Open
Abstract
The clinical relevance of immune landscape intratumoural heterogeneity (immune-ITH) and its role in tumour evolution remain largely unexplored. Here, we uncover significant spatial and phenotypic immune-ITH from multiple tumour sectors and decipher its relationship with tumour evolution and disease progression in hepatocellular carcinomas (HCC). Immune-ITH is associated with tumour transcriptomic-ITH, mutational burden and distinct immune microenvironments. Tumours with low immune-ITH experience higher immunoselective pressure and escape via loss of heterozygosity in human leukocyte antigens and immunoediting. Instead, the tumours with high immune-ITH evolve to a more immunosuppressive/exhausted microenvironment. This gradient of immune pressure along with immune-ITH represents a hallmark of tumour evolution, which is closely linked to the transcriptome-immune networks contributing to disease progression and immune inactivation. Remarkably, high immune-ITH and its transcriptomic signature are predictive for worse clinical outcome in HCC patients. This in-depth investigation of ITH provides evidence on tumour-immune co-evolution along HCC progression.
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Affiliation(s)
- Phuong H. D. Nguyen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Siming Ma
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Cheryl Z. J. Phua
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Neslihan A. Kaya
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore ,grid.59025.3b0000 0001 2224 0361School of Biological Sciences, Nanyang Technological University Singapore, Singapore, Singapore
| | - Hannah L. H. Lai
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Jia Qi Lim
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Liyun Lai
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Wai Leong Tam
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore ,grid.59025.3b0000 0001 2224 0361School of Biological Sciences, Nanyang Technological University Singapore, Singapore, Singapore ,grid.4280.e0000 0001 2180 6431Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore ,grid.4280.e0000 0001 2180 6431Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Tony K. H. Lim
- grid.163555.10000 0000 9486 5048Department of Pathology, Singapore General Hospital, Singapore, Singapore ,grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore
| | - Wei Keat Wan
- grid.163555.10000 0000 9486 5048Department of Pathology, Singapore General Hospital, Singapore, Singapore ,grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore
| | - Tracy Loh
- grid.163555.10000 0000 9486 5048Department of Pathology, Singapore General Hospital, Singapore, Singapore ,grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore
| | - Wei Qiang Leow
- grid.163555.10000 0000 9486 5048Department of Pathology, Singapore General Hospital, Singapore, Singapore ,grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore
| | - Yin Huei Pang
- grid.412106.00000 0004 0621 9599Department of Pathology, National University Hospital Singapore, Singapore, Singapore
| | - Chung Yip Chan
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Ser Yee Lee
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Peng Chung Cheow
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Han Chong Toh
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore
| | - Florent Ginhoux
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore ,grid.430276.40000 0004 0387 2429Singapore Immunology Network (SIgN), A*STAR, Singapore, Singapore
| | - Shridhar Iyer
- grid.412106.00000 0004 0621 9599Department of Medicine, Yong Loo Lin School of Medicine, National University Hospital Singapore, Singapore, Singapore
| | - Alfred W. C. Kow
- grid.412106.00000 0004 0621 9599Department of Medicine, Yong Loo Lin School of Medicine, National University Hospital Singapore, Singapore, Singapore
| | - Yock Young Dan
- grid.412106.00000 0004 0621 9599Division of Gastroenterology and Hepatology, National University Hospital Singapore, Singapore, Singapore
| | - Alexander Chung
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Brian K. P. Goh
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Pierce K. H. Chow
- grid.428397.30000 0004 0385 0924Duke-NUS Medical School, Singapore, Singapore ,grid.410724.40000 0004 0620 9745National Cancer Centre, Singapore, Singapore ,grid.163555.10000 0000 9486 5048Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Weiwei Zhai
- grid.418377.e0000 0004 0620 715XGenome Institute of Singapore (GIS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore ,grid.458458.00000 0004 1792 6416Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China ,grid.9227.e0000000119573309Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore.
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13
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Wasser M, Yeo JG, Kumar P, Chew V, Lim CJ, Arkachaisri T, Poh SL, Leong JY, Yeo KT, Albani S. The EPIC data analytics platform for clinical mass cytometry. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.159.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Single cell technologies, such as high-dimensional cytometry, promise to enable the discovery of immune cell populations that will serve as clinical biomarkers. Recently, we reported the creation of a reference database of the healthy immune system from birth to old age and the development of the EPIC (Extended Poly-dimensional Immunome characterisation) data mining platform (Nature Biotech, accepted). Here we extend the analytics pipeline to facilitate detection of clinically stratifying cell populations in mass cytometry (CyTOF or cytometry by time-of-flight) data. Data structures called immune maps are used to integrate single cell protein expression data (over 40) of multiple samples with clinical metadata and phenotypic information inferred from automated clustering and assisted cell type annotation. Clustering is combined with batch effect correction to reduce technical while preserving biological variations. Subsequent single cell exploratory data analysis and statistical tests help to identify cell populations whose frequencies differ significantly between groups of patients. To gain further insights, users can compare their cytometry data with the healthy reference immunome by performing two types of analysis; (1) mapping to existing clusters helps obtain abundance estimates of immune cell types, (2) reclustering of uploaded data merged with reference immunomes uncovers differences to healthy immune profiles of different ages. We implemented the EPIC pipeline using R Shiny to provide interactive visualisation and an intuitive user interface. We will show examples on how the EPIC platform can characterise cellular diversity in the context of disease and the morphogenesis of the healthy immune system.
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Affiliation(s)
- Martin Wasser
- 1SingHealth Duke NUS Academic Medical Centre, Singapore
| | - Joo Guan Yeo
- 1SingHealth Duke NUS Academic Medical Centre, Singapore
- 2KK Women’s and Children’s Hospital, Singapore, Singapore
| | | | - Valerie Chew
- 1SingHealth Duke NUS Academic Medical Centre, Singapore
| | - Chun Jye Lim
- 1SingHealth Duke NUS Academic Medical Centre, Singapore
| | | | - Su Li Poh
- 1SingHealth Duke NUS Academic Medical Centre, Singapore
| | | | - Kee Thai Yeo
- 2KK Women’s and Children’s Hospital, Singapore, Singapore
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14
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Abstract
Hepatocellular carcinoma (HCC), is the most common type of liver cancer which is derived mostly from the background of chronic inflammation. Chronic hepatitis viral infection remains one of the most common etiologies implicated in chronic liver inflammation, cirrhosis, and HCC. With such background inflammation, immunotherapy-particularly the checkpoint inhibitors-have been tested in HCC patients with unprecedented success. However, despite the initial enthusiasm, the response rate to immunotherapy remains modest in most clinical trials (approximately 20%), with mixed reports on response rates in hepatitis viral-related HCC as compared with nonviral HCC. Given such complexity in response to immunotherapy, it is increasingly appreciated that deeper understanding of the tumor molecular features and tumor microenvironment of hepatitis viral-related HCC is crucial for the design of more effective immunotherapeutics. We discuss herein the current knowledge in tumor genomic mutational and immune landscapes as well as the ongoing immunotherapy trials in HCC with the unique focus on their viral etiologies. Based on this understanding, we also outline perspectives and rationale on the design of potential immunotherapeutic strategies in HCC patients according to their viral etiologies.
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Affiliation(s)
- Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-Duke-NUS Academic Medical Centre, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-Duke-NUS Academic Medical Centre, Singapore, Singapore
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15
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Lam JH, Ng HHM, Lim CJ, Sim XN, Malavasi F, Li H, Loh JJH, Sabai K, Kim JK, Ong CCH, Loh T, Leow WQ, Choo SP, Toh HC, Lee SY, Chan CY, Chew V, Lim TS, Yeong J, Lim TKH. Expression of CD38 on Macrophages Predicts Improved Prognosis in Hepatocellular Carcinoma. Front Immunol 2019; 10:2093. [PMID: 31552039 PMCID: PMC6738266 DOI: 10.3389/fimmu.2019.02093] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 08/20/2019] [Indexed: 12/28/2022] Open
Abstract
Background: CD38 is involved in the adenosine pathway, which represents one of the immunosuppressive mechanisms in cancer. CD38 is broadly expressed across immune cell subsets, including human macrophages differentiated in vitro from monocytes, but expression by tissue-resident macrophages remains to be demonstrated. Methods: Tissue samples were obtained from 66 patients with hepatocellular carcinoma (HCC) from Singapore and analyzed using immunohistochemistry. Tumor-infiltrating leukocytes (TILs) were further examined using DEPArray™, and the phenotype of freshly isolated TILs was determined using flow cytometry. Results: CD38 was frequently co-expressed with the macrophage-specific marker CD68. CD38+CD68+ macrophage density was associated with improved prognosis after surgery, while total CD68+ macrophage density was associated with poor prognosis. DEPArray™ analysis revealed the presence of large (>10 μm), irregularly shaped CD45+CD14+ cells that resembled macrophages, with concurrent CD38+ expression. Flow cytometry also revealed that majority of CD14+HLA-DR+ cells expressed CD38. Conclusion: CD38 expression was clearly demonstrated on human macrophages in an in vivo setting. The positive association identified between CD38+ macrophage density and prognosis may have implications for routine diagnostic work.
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Affiliation(s)
- Jian Hang Lam
- Division of Pathology, Singapore General Hospital, Singapore, Singapore.,A. Menarini Biomarkers Singapore Pte Ltd., Singapore, Singapore
| | | | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Xin Ni Sim
- Division of Pathology, Singapore General Hospital, Singapore, Singapore.,Temasek Polytechnic, Singapore, Singapore
| | - Fabio Malavasi
- Department of Medical Science, University of Turin and Fondazione Ricerca Molinette, Turin, Italy
| | - Huihua Li
- Division of Medicine, Singapore General Hospital, Singapore, Singapore.,Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore
| | - Josh Jie Hua Loh
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Khin Sabai
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Joo-Kyung Kim
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | | | - Tracy Loh
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Wei Qiang Leow
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Su Pin Choo
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Han Chong Toh
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore
| | - Ser Yee Lee
- Duke-NUS Medical School, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Chung Yip Chan
- Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Tong Seng Lim
- A. Menarini Biomarkers Singapore Pte Ltd., Singapore, Singapore
| | - Joe Yeong
- Division of Pathology, Singapore General Hospital, Singapore, Singapore.,Institute of Molecular Cell Biology, Agency of Science, Technology and Research (ASTAR), Singapore, Singapore
| | - Tony Kiat Hon Lim
- Division of Pathology, Singapore General Hospital, Singapore, Singapore
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16
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Lim CJ, Lee YH, Pan L, Lai L, Chua C, Wasser M, Lim TKH, Yeong J, Toh HC, Lee SY, Chan CY, Goh BK, Chung A, Heikenwälder M, Ng IO, Chow P, Albani S, Chew V. Multidimensional analyses reveal distinct immune microenvironment in hepatitis B virus-related hepatocellular carcinoma. Gut 2019; 68:916-927. [PMID: 29970455 DOI: 10.1136/gutjnl-2018-316510] [Citation(s) in RCA: 196] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/30/2018] [Accepted: 06/01/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Chronic inflammation induced by chronic hepatitis B virus (HBV) infection increases the risk of hepatocellular carcinoma (HCC). However, little is known about the immune landscape of HBV-related HCC and its influence on the design of effective cancer immunotherapeutics. METHODS We interrogated the immune microenvironments of HBV-related HCC and non-viral-related HCC using immunohistochemistry and cytometry by time-of-flight (CyTOF). On identifying unique immune subsets enriched in HBV-related HCC, we further interrogated their phenotypes and functions using next-generation sequencing (NGS) and in vitro T-cell proliferation assays. RESULTS In-depth interrogation of the immune landscapes showed that regulatory T cells (TREG) and CD8+ resident memory T cells (TRM) were enriched in HBV-related HCC, whereas Tim-3+CD8+ T cells and CD244+ natural killer cells were enriched in non-viral-related HCC. NGS of isolated TREG and TRM from HBV-related HCC and non-viral-related HCC identified distinct functional signatures associated with T-cell receptor signalling, T-cell costimulation, antigen presentation and programmed cell death protein 1 (PD-1) signalling. TREG and TRM from HBV-related HCC expressed more PD-1 and were functionally more suppressive and exhausted than those from non-virus-related HCC. Furthermore, immunosuppression by PD-1+ TREG could be reversed with anti-PD-1 blockade. Using multiplexed tissue immunofluorescence, we further demonstrated that TREG and TRM contributed to overall patient survival: TREG were associated with a poor prognosis and TRM were associated with a good prognosis in HCC. CONCLUSION We have shown that the HBV-related HCC microenvironment is more immunosuppressive and exhausted than the non-viral-related HCC microenvironment. Such in-depth understanding has important implications in disease management and appropriate application of immunotherapeutics.
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Affiliation(s)
- Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Yun Hua Lee
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Lu Pan
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Liyun Lai
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Tony Kiat Hon Lim
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Duke-NUS Medical School, Singapore, Singapore
| | - Joe Yeong
- Department of Pathology, Singapore General Hospital, Singapore, Singapore.,Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Han Chong Toh
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore
| | - Ser Yee Lee
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Chung Yip Chan
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Brian Kp Goh
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Alexander Chung
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Mathias Heikenwälder
- Division of Chronic Inflammation and Cancer, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Irene Ol Ng
- Department of Pathology and State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, Hong Kong
| | - Pierce Chow
- Duke-NUS Medical School, Singapore, Singapore.,National Cancer Centre, Singapore, Singapore.,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore, Singapore
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore, Singapore
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17
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Chew V, Lee YH, Pan L, Nasir NJM, Lim CJ, Chua C, Lai L, Hazirah SN, Lim TKH, Goh BKP, Chung A, Lo RHG, Ng D, Filarca RLF, Albani S, Chow PKH. Immune activation underlies a sustained clinical response to Yttrium-90 radioembolisation in hepatocellular carcinoma. Gut 2019; 68:335-346. [PMID: 29440463 PMCID: PMC6352403 DOI: 10.1136/gutjnl-2017-315485] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/29/2017] [Accepted: 12/15/2017] [Indexed: 02/06/2023]
Abstract
OBJECTIVES Yttrium-90 (Y90)-radioembolisation (RE) significantly regresses locally advanced hepatocellular carcinoma and delays disease progression. The current study is designed to deeply interrogate the immunological impact of Y90-RE, which elicits a sustained therapeutic response. DESIGN Time-of-flight mass cytometry and next-generation sequencing (NGS) were used to analyse the immune landscapes of tumour-infiltrating leucocytes (TILs), tumour tissues and peripheral blood mononuclear cells (PBMCs) at different time points before and after Y90-RE. RESULTS TILs isolated after Y90-RE exhibited signs of local immune activation: higher expression of granzyme B (GB) and infiltration of CD8+ T cells, CD56+ NK cells and CD8+ CD56+ NKT cells. NGS confirmed the upregulation of genes involved in innate and adaptive immune activation in Y90-RE-treated tumours. Chemotactic pathways involving CCL5 and CXCL16 correlated with the recruitment of activated GB+CD8+ T cells to the Y90-RE-treated tumours. When comparing PBMCs before and after Y90-RE, we observed an increase in tumour necrosis factor-α on both the CD8+ and CD4+ T cells as well as an increase in percentage of antigen-presenting cells after Y90-RE, implying a systemic immune activation. Interestingly, a high percentage of PD-1+/Tim-3+CD8+ T cells coexpressing the homing receptors CCR5 and CXCR6 denoted Y90-RE responders. A prediction model was also built to identify sustained responders to Y90-RE based on the immune profiles from pretreatment PBMCs. CONCLUSION High-dimensional analysis of tumour and systemic immune landscapes identified local and systemic immune activation that corresponded to the sustained response to Y90-RE. Potential biomarkers associated with a positive clinical response were identified and a prediction model was built to identify sustained responders prior to treatment.
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Affiliation(s)
- Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Yun Hua Lee
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Lu Pan
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Nurul J M Nasir
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Liyun Lai
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Sharifah Nur Hazirah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Tony Kiat Hon Lim
- Department of Pathology, Singapore General Hospital, Singapore,Duke-NUS Medical School, Singapore
| | - Brian K P Goh
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore
| | - Alexander Chung
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore
| | - Richard H G Lo
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Diagnostic Radiology, Singapore General Hospital, Singapore
| | - David Ng
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Nuclear Medicine and Molecular Imaging, Singapore General Hospital, Singapore
| | - Rene L F Filarca
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore.
| | - Pierce K H Chow
- Duke-NUS Medical School, Singapore,National Cancer Centre, Singapore,Department of Hepatopancreatobiliary and Transplant Surgery, Singapore General Hospital, Singapore
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18
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Hoeppli RE, MacDonald KN, Leclair P, Fung VCW, Mojibian M, Gillies J, Rahavi SMR, Campbell AIM, Gandhi SK, Pesenacker AM, Reid G, Lim CJ, Levings MK. Tailoring the homing capacity of human Tregs for directed migration to sites of Th1-inflammation or intestinal regions. Am J Transplant 2019; 19:62-76. [PMID: 29766641 DOI: 10.1111/ajt.14936] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 04/17/2018] [Accepted: 05/06/2018] [Indexed: 01/25/2023]
Abstract
Cell-based therapy with CD4+ FOXP3+ regulatory T cells (Tregs) is a promising strategy to limit organ rejection and graft-vs-host disease. Ongoing clinical applications have yet to consider how human Tregs could be modified to direct their migration to specific inflammation sites and/or tissues for more targeted immunosuppression. We show here that stable, homing-receptor-tailored human Tregs can be generated from thymic Tregs isolated from pediatric thymus or adult blood. To direct migration to Th1-inflammatory sites, addition of interferon-γ and IL-12 during Treg expansion produced suppressive, epigenetically stable CXCR3+ TBET+ FOXP3+ T helper (Th)1-Tregs. CXCR3 remained expressed after injection in vivo and Th1-Tregs migrated efficiently towards CXCL10 in vitro. To induce tissue-specific migration, addition of retinoic acid (RA) during Treg expansion induced expression of the gut-homing receptors α4β7-integrin and CCR9. FOXP3+ RA-Tregs had elevated expression of the functional markers latency-associated peptide and glycoprotein A repetitions predominant, increased suppressive capacity in vitro and migrated efficiently to healthy and inflamed intestine after injection into mice. Homing-receptor-tailored Tregs were epigenetically stable even after long-term exposure to inflammatory conditions, suppressive in vivo and characterized by Th1- or gut-homing-specific transcriptomes. Tailoring human thymic Treg homing during in vitro expansion offers a new and clinically applicable approach to improving the potency and specificity of Treg therapy.
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Affiliation(s)
- R E Hoeppli
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - K N MacDonald
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC, Canada.,Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
| | - P Leclair
- Department of Pediatrics, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - V C W Fung
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - M Mojibian
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - J Gillies
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - S M R Rahavi
- Department of Pediatrics, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - A I M Campbell
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - S K Gandhi
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - A M Pesenacker
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - G Reid
- Department of Pediatrics, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - C J Lim
- Department of Pediatrics, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada
| | - M K Levings
- Department of Surgery, University of British Columbia & British Columbia Children's Hospital Research Institute, Vancouver, BC, Canada.,School of Biomedical Engineering, University of British Columbia, Vancouver, BC, Canada
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19
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Lim JCT, Yeong JPS, Lim CJ, Ong CCH, Wong SC, Chew VSP, Ahmed SS, Tan PH, Iqbal J. An automated staining protocol for seven-colour immunofluorescence of human tissue sections for diagnostic and prognostic use. Pathology 2018; 50:333-341. [PMID: 29429740 DOI: 10.1016/j.pathol.2017.11.087] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 11/09/2017] [Accepted: 11/14/2017] [Indexed: 02/06/2023]
Abstract
Multiplex immunofluorescence (mIF) allows simultaneous antibody-based detection and quantification of the expression of up to six markers, plus a nuclear counterstain, on a single tissue section. Recent studies have shown the potential for mIF to advance our understanding of complex disease processes, including cancer. It is important that the technique be standardised and validated to facilitate its transition into clinical use. Traditional approaches to mIF rely on manual processing of sections, which is time-consuming and a source of significant variation between samples/individuals. Here we determined if an automated diagnostic tissue stainer could be used for mIF incorporating tyramide signal amplification (TSA), and how the final image quality compared with sections stained semi-automatically or manually. Using tissue microarrays of fixed human breast tumour sections, we observed comparable antibody labelling between the diagnostic autostainer and manual technique. The diagnostic autostainer produced higher signal intensity with similar spectral unmixing efficiency. We also found that microwave treatment for antibody stripping during TSA labelling could be replaced by the heating option incorporated within the diagnostic-use autostainer. These data show that diagnostic autostainers used for traditional immunohistochemistry protocols can be readily adapted to achieve rapid preparation of high-quality sections using a TSA method for clinical mIF.
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Affiliation(s)
| | - Joe Poh Sheng Yeong
- Department of Anatomical Pathology, Singapore General Hospital, Singapore; Singapore Immunology Network, Agency of Science, Technology and Research, Singapore
| | - Chun Jye Lim
- SingHealth Translational Immunology and Inflammation Centre, Singapore
| | | | - Siew Cheng Wong
- Singapore Immunology Network, Agency of Science, Technology and Research, Singapore
| | | | | | - Puay Hoon Tan
- Division of Pathology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore
| | - Jabed Iqbal
- Department of Anatomical Pathology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore.
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20
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Kaan HYK, Chan SW, Tan SKJ, Guo F, Lim CJ, Hong W, Song H. Crystal structure of TAZ-TEAD complex reveals a distinct interaction mode from that of YAP-TEAD complex. Sci Rep 2017; 7:2035. [PMID: 28515457 PMCID: PMC5435683 DOI: 10.1038/s41598-017-02219-9] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 04/07/2017] [Indexed: 12/12/2022] Open
Abstract
The Hippo pathway is a tumor suppressor pathway that is implicated in the regulation of organ size. The pathway has three components: the upstream regulatory factors, the kinase core, and the downstream transcriptional machinery, which consists of YAP, TAZ (transcription co-activators) and TEAD (transcription factor). Formation of YAP/TAZ-TEAD complexes leads to the transcription of growth-promoting genes. Herein, we report the crystal structure of TAZ-TEAD4 complex, which reveals two binding modes. The first is similar to the published YAP-TEAD structure. The second is a unique binding mode, whereby two molecules of TAZ bind to and bridge two molecules of TEAD4. We validated the latter using cross-linking and multi-angle light scattering. Using siRNA, we showed that TAZ knockdown leads to a decrease in TEAD4 dimerization. Lastly, results from luciferase assays, using YAP/TAZ transfected or knockdown cells, give support to the non-redundancy of YAP/TAZ co-activators in regulating gene expression in the Hippo pathway.
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Affiliation(s)
- Hung Yi Kristal Kaan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Siew Wee Chan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Siew Kim Joyce Tan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Fusheng Guo
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Chun Jye Lim
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Wanjin Hong
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore.
| | - Haiwei Song
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore. .,Department of Biochemistry, National University of Singapore, 14 Science Drive, Singapore, 117543, Singapore.
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21
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Garnelo M, Tan A, Her Z, Yeong J, Lim CJ, Chen J, Lim KH, Weber A, Chow P, Chung A, Ooi LLPJ, Toh HC, Heikenwalder M, Ng IOL, Nardin A, Chen Q, Abastado JP, Chew V. Interaction between tumour-infiltrating B cells and T cells controls the progression of hepatocellular carcinoma. Gut 2017; 66:342-351. [PMID: 26669617 PMCID: PMC5284473 DOI: 10.1136/gutjnl-2015-310814] [Citation(s) in RCA: 305] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 10/12/2015] [Accepted: 10/14/2015] [Indexed: 12/12/2022]
Abstract
OBJECTIVE The nature of the tumour-infiltrating leucocytes (TILs) is known to impact clinical outcome in carcinomas, including hepatocellular carcinoma (HCC). However, the role of tumour-infiltrating B cells (TIBs) remains controversial. Here, we investigate the impact of TIBs and their interaction with T cells on HCC patient prognosis. DESIGN Tissue samples were obtained from 112 patients with HCC from Singapore, Hong Kong and Zurich and analysed using immunohistochemistry and immunofluorescence. RNA expression of CD19, CD8A, IFNG was analysed using quantitative PCR. The phenotype of freshly isolated TILs was analysed using flow cytometry. A mouse model depleted of mature B cells was used for functional study. RESULTS Tumour-infiltrating T cells and B cells were observed in close contact with each other and their densities are correlated with superior survival in patients with HCC. Furthermore, the density of TIBs was correlated with an enhanced expression of granzyme B and IFN-γ, as well as with reduced tumour viability defined by low expression of Ki-67, and an enhanced expression of activated caspase-3 on tumour cells. CD27 and CD40 costimulatory molecules and TILs expressing activation marker CD38 in the tumour were also correlated with patient survival. Mice depleted of mature B cells and transplanted with murine hepatoma cells showed reduced tumour control and decreased local T cell activation, further indicating the important role of B cells. CONCLUSIONS The close proximity of tumour-infiltrating T cells and B cells indicates a functional interaction between them that is linked to an enhanced local immune activation and contributes to better prognosis for patients with HCC.
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Affiliation(s)
- Marta Garnelo
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| | - Alex Tan
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| | - Zhisheng Her
- Institute of Molecular and Cell Biology (IMCB), A*STAR, Biopolis, Singapore
| | - Joe Yeong
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore,Department of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Chun Jye Lim
- SingHealth Translational Immunology and Inflammation Centre (STIIC), Singapore Health Services Pte Ltd, Singapore, Singapore
| | - Jinmiao Chen
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| | - Kiat Hon Lim
- Department of Pathology, Singapore General Hospital, Singapore, Singapore
| | - Achim Weber
- Institute of Surgical Pathology, University Hospital of Zurich, Zurich, Switzerland
| | - Pierce Chow
- National Cancer Centre, Singapore, Singapore,Singapore General Hospital, Singapore, Singapore,Duke-NUS Graduate Medical School, Singapore, Singapore
| | - Alexander Chung
- National Cancer Centre, Singapore, Singapore,Singapore General Hospital, Singapore, Singapore
| | - London Lucien PJ Ooi
- National Cancer Centre, Singapore, Singapore,Singapore General Hospital, Singapore, Singapore,Duke-NUS Graduate Medical School, Singapore, Singapore
| | | | - Mathias Heikenwalder
- Division of Chronic Inflammation and Cancer, German Cancer Research Center (DKFZ), Heidelberg, Germany,Institute of Virology, Technical University München/Helmholtz Zentrum München, Germany
| | - Irene O L Ng
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, Hong Kong
| | - Alessandra Nardin
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| | - Qingfeng Chen
- Institute of Molecular and Cell Biology (IMCB), A*STAR, Biopolis, Singapore,National Cancer Centre, Singapore, Singapore
| | - Jean-Pierre Abastado
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore,Institut de Recherches Internationales Servier, Suresnes, France
| | - Valerie Chew
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore,SingHealth Translational Immunology and Inflammation Centre (STIIC), Singapore Health Services Pte Ltd, Singapore, Singapore,Duke-NUS Graduate Medical School, Singapore, Singapore
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22
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Khademolhosseini F, Liu CC, Lim CJ, Chiao M. A magnetically actuated cellular strain assessment tool for quantitative analysis of strain induced cellular reorientation and actin alignment. Rev Sci Instrum 2016; 87:085004. [PMID: 27587150 DOI: 10.1063/1.4960567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Commercially available cell strain tools, such as pneumatically actuated elastomer substrates, require special culture plates, pumps, and incubator setups. In this work, we present a magnetically actuated cellular strain assessment tool (MACSAT) that can be implemented using off-the-shelf components and conventional incubators. We determine the strain field on the MACSAT elastomer substrate using numerical models and experimental measurements and show that a specific region of the elastomer substrate undergoes a quasi-uniaxial 2D stretch, and that cells confined to this region of the MACSAT elastomer substrate undergo tensile, compressive, or zero axial strain depending on their angle of orientation. Using the MACSAT to apply cyclic strain on endothelial cells, we demonstrate that actin filaments within the cells reorient away from the stretching direction, towards the directions of minimum axial strain. We show that the final actin orientation angles in strained cells are spread over a region of compressive axial strain, confirming previous findings on the existence of a varied pre-tension in the actin filaments of the cytoskeleton. We also demonstrate that strained cells exhibit distinctly different values of actin alignment coherency compared to unstrained cells and therefore propose that this parameter, i.e., the coherency of actin alignment, can be used as a new readout to determine the occurrence/extent of actin alignment in cell strain experiments. The tools and methods demonstrated in this study are simple and accessible and can be easily replicated by other researchers to study the strain response of other adherent cells.
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Affiliation(s)
- F Khademolhosseini
- Department of Mechanical Engineering, University of British Columbia, Vancouver, British Columbia V6T-1Z4, Canada
| | - C-C Liu
- Department of Medicine, University of British Columbia, Vancouver, British Columbia V5Z-1M9, Canada
| | - C J Lim
- Child and Family Research Institute, BC Children's Hospital, Vancouver, British Columbia V5Z-4H4, Canada
| | - M Chiao
- Department of Mechanical Engineering, University of British Columbia, Vancouver, British Columbia V6T-1Z4, Canada
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23
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Liu CC, Leclair P, Monajemi M, Sly LM, Reid GS, Lim CJ. α-Integrin expression and function modulates presentation of cell surface calreticulin. Cell Death Dis 2016; 7:e2268. [PMID: 27310876 PMCID: PMC5143402 DOI: 10.1038/cddis.2016.176] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 05/10/2016] [Accepted: 05/26/2016] [Indexed: 12/22/2022]
Abstract
Calreticulin presentation on the cell surface is an important hallmark of immunogenic cell death (ICD), serving as the prophagocytic signal for macrophages. Cell adhesion is a physiologically relevant stimulus previously shown to increase calreticulin interaction with α-integrins via the juxtamembrane, cytosolic GFFKR motif. This study assessed whether integrin function can regulate surface calreticulin levels in ICD. We generated calreticulin-null T-lymphoblasts and confirmed the loss of surface calreticulin expression on cells treated with doxorubicin, an ICD inducer. Reconstituted expression with full-length calreticulin targeted to the endoplasmic reticulum (ER) successfully rescued doxorubicin-induced surface calreticulin. Reconstitution with a truncation mutant calreticulin targeted to the cytosol led to constitutively high surface calreticulin that was not further elevated by doxorubicin, suggesting calreticulin released from the stressed ER transits the cytosol before its translocation to the cell surface. When stimulated to engage integrin substrates, doxorubicin-treated wild-type T-lymphoblasts exhibited decreased surface calreticulin compared with cells under non-adherent conditions. The inhibitory effect on surface calreticulin was recapitulated for cells in suspension treated with a β1-integrin-activating antibody, 9EG7. Similarly, cells expressing a truncated α-integrin cytosolic tail, bearing only the juxtamembrane GFFKR calreticulin-binding motif, exhibited low surface calreticulin with doxorubicin treatment under non-adherent conditions. Using partial permeabilization techniques to distinguish between cytosolic and ER staining, we found that ICD inducers promoted the accumulation of cytosolic calreticulin with negligible change in total calreticulin, suggesting that integrin-mediated inhibition of surface calreticulin was due to reduced cytosolic to surface translocation. T-lymphoblasts co-treated with an ICD inducer and 9EG7 exhibited reduced phagocytosis by macrophages when compared with treatment with only ICD inducer. This study reveals a previously uncharacterized function of integrins as negative regulators of ICD by suppressing presentation of cell surface calreticulin.
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Affiliation(s)
- C-C Liu
- Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada V5Z 4H4.,Department of Medicine, University of British Columbia, Vancouver, BC, Canada V5Z 4H4
| | - P Leclair
- Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada V5Z 4H4
| | - M Monajemi
- Department of Medicine, University of British Columbia, Vancouver, BC, Canada V5Z 4H4
| | - L M Sly
- Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada V5Z 4H4
| | - G S Reid
- Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada V5Z 4H4.,Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital, Vancouver, BC, Canada V5Z 4H4
| | - C J Lim
- Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada V5Z 4H4.,Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital, Vancouver, BC, Canada V5Z 4H4
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24
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Li Y, Zhou H, Li F, Chan SW, Lin Z, Wei Z, Yang Z, Guo F, Lim CJ, Xing W, Shen Y, Hong W, Long J, Zhang M. Angiomotin binding-induced activation of Merlin/NF2 in the Hippo pathway. Cell Res 2015; 25:801-17. [PMID: 26045165 PMCID: PMC4493278 DOI: 10.1038/cr.2015.69] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 12/18/2022] Open
Abstract
The tumor suppressor Merlin/NF2 functions upstream of the core Hippo pathway kinases Lats1/2 and Mst1/2, as well as the nuclear E3 ubiquitin ligase CRL4(DCAF1). Numerous mutations of Merlin have been identified in Neurofibromatosis type 2 and other cancer patients. Despite more than two decades of research, the upstream regulator of Merlin in the Hippo pathway remains unknown. Here we show by high-resolution crystal structures that the Lats1/2-binding site on the Merlin FERM domain is physically blocked by Merlin's auto-inhibitory tail. Angiomotin binding releases the auto-inhibition and promotes Merlin's binding to Lats1/2. Phosphorylation of Ser518 outside the Merlin's auto-inhibitory tail does not obviously alter Merlin's conformation, but instead prevents angiomotin from binding and thus inhibits Hippo pathway kinase activation. Cancer-causing mutations clustered in the angiomotin-binding domain impair angiomotin-mediated Merlin activation. Our findings reveal that angiomotin and Merlin respectively interface cortical actin filaments and core kinases in Hippo signaling, and allow construction of a complete Hippo signaling pathway.
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Affiliation(s)
- Youjun Li
- Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong, China
| | - Hao Zhou
- 1] State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China [2] College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Fengzhi Li
- 1] State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China [2] College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Siew Wee Chan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 61, Biopolis Drive, Proteos, Singapore 138673, Singapore
| | - Zhijie Lin
- Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong, China
| | - Zhiyi Wei
- 1] Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong, China [2] Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong 518055, China
| | - Zhou Yang
- Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong, China
| | - Fusheng Guo
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 61, Biopolis Drive, Proteos, Singapore 138673, Singapore
| | - Chun Jye Lim
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 61, Biopolis Drive, Proteos, Singapore 138673, Singapore
| | - Wancai Xing
- 1] State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China [2] College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Yuequan Shen
- 1] State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China [2] College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Wanjin Hong
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 61, Biopolis Drive, Proteos, Singapore 138673, Singapore
| | - Jiafu Long
- 1] State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China [2] College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Mingjie Zhang
- 1] Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong, China [2] Center of Systems Biology and Human Health, School of Science and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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25
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Chan HK, Hassali MA, Lim CJ, Saleem F, Tan WL. Using pictograms to assist caregivers in liquid medication administration: a systematic review. J Clin Pharm Ther 2015; 40:266-72. [PMID: 25865563 DOI: 10.1111/jcpt.12272] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 03/18/2015] [Indexed: 01/20/2023]
Abstract
WHAT IS KNOWN AND OBJECTIVE It has been reported that more than 80% of out-of-hospital medication errors among the young children involve liquid formulations. The usefulness of pictorial aids to improve communication of medication instructions has not been extensively investigated for child health. The objective of this study was to determine the effectiveness of pictorial aids used to assist caregivers in the administration of liquid medications. METHODS MEDLINE, CINAHL, PsycINFO, ScienceDirect, Scopus and the Cochrane Library were searched for articles published up to February 2015. Studies that used pictorial aids with liquid medications and measured at least one of the following outcomes were included: dosing accuracy, comprehension of medication instructions, recall of information and adherence of caregivers. Two authors independently selected studies, extracted data and assessed methodological quality of studies using the Cochrane Collaboration's tool. RESULTS AND DISCUSSION Five experimental studies (four hospital based and one community based) with a total of 962 participants were included. A wide range of liquid formulations were studied, including both prescription and over-the-counter medications. The existing findings suggest that pictographic interventions reduced dosing errors, enhanced comprehension and recall of medication instructions and improved adherence of caregivers. Incorporating pictorial aids into verbal medication counselling or text-based instructions was more beneficial than using the single approach alone. Mixed results were identified for the relationship between health literacy of caregivers and effectiveness of pictorial aids. WHAT IS NEW AND CONCLUSION The evidence remains limited due to the small number of studies found and variations in methodological quality. This review suggests that pictorial aids might be potential interventions, but more high-quality studies are needed to support the routine use of any pictogram-based materials with liquid medications in the clinical settings.
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Affiliation(s)
- H K Chan
- Department of Pharmacy, Hospital Sultanah Bahiyah, Kedah, Malaysia
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26
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Oh KS, Lee JH, Yi KY, Lim CJ, Lee S, Park CH, Seo HW, Lee BH. The orally active urotensin receptor antagonist, KR36676, attenuates cellular and cardiac hypertrophy. Br J Pharmacol 2015; 172:2618-33. [PMID: 25597918 DOI: 10.1111/bph.13082] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 12/11/2014] [Accepted: 01/13/2015] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Blockade of the actions of urotensin-II (U-II) mediated by the urotensin (UT) receptor should improve cardiac function and prevent cardiac remodelling in cardiovascular disease. Here, we have evaluated the pharmacological properties of the recently identified UT receptor antagonist, 2-(6,7-dichloro-3-oxo-2H-benzo[b][1,4]oxazin-4(3H)-yl)-N-methyl-N-(2-(pyrrolidin-1-yl)-1-(4-(thiophen-3-yl)phenyl) ethyl)acetamide (KR36676). EXPERIMENTAL APPROACH Pharmacological properties of KR36676 were studied in a range of in vitro assays (receptor binding, calcium mobilization, stress fibre formation, cellular hypertrophy) and in vivo animal models such as cardiac hypertrophy induced by transverse aortic constriction (TAC) or myocardial infarction (MI). KEY RESULTS KR36676 displayed high binding affinity for the UT receptor (Ki : 0.7 nM), similar to that of U-II (0.4 nM), and was a potent antagonist at that receptor (IC50 : 4.0 nM). U-II-induced stress fibre formation and cellular hypertrophy were significantly inhibited with low concentrations of KR36676 (≥0.01 μM). Oral administration of KR36676 (30 mg·kg(-1) ) in a TAC model in mice attenuated cardiac hypertrophy and myocardial fibrosis. Moreover, KR36676 restored cardiac function and myocyte size in rats with MI-induced cardiac hypertrophy. CONCLUSIONS AND IMPLICATIONS A highly potent UT receptor antagonist exerted anti-hypertrophic effects not only in infarcted rat hearts but also in pressure-overloaded mouse hearts. KR36676 could be a valuable pharmacological tool in elucidating the complicated physiological role of U-II and UT receptors in cardiac hypertrophy.
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Affiliation(s)
- K S Oh
- Research Center for Drug Discovery Technology, Korea Research Institute of Chemical Technology, Daejeon, Korea; Department of Medicinal and Pharmaceutical Chemistry, University of Science and Technology, Daejeon, Korea
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Chan SW, Lim CJ, Guo F, Tan I, Leung T, Hong W. Actin-binding and cell proliferation activities of angiomotin family members are regulated by Hippo pathway-mediated phosphorylation. J Biol Chem 2013; 288:37296-307. [PMID: 24225952 DOI: 10.1074/jbc.m113.527598] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Whether the Hippo pathway has downstream targets other than YAP and TAZ is unknown. In this report, we have identified angiomotin (Amot) family members as novel substrates of Hippo core kinases. The N-terminal regions of Amot proteins contain a conserved HXRXXS consensus site for LATS1/2-mediated phosphorylation. Phospho-specific antibodies showed that Hippo core kinases could mediate phosphorylation of endogenous as well as exogenous Amot family members. Knockdown of LATS1 and LATS2 endogenously reduced the phosphorylation of Amots detected by the phospho-specific antibodies. Mutation of the serine to alanine within this HXRXXS site in Amot and AmotL2 established that this site was essential for Hippo core kinase-mediated phosphorylation. Wild-type and non-phosphorylated Amot (Amot-S175A) were targeted to actin filaments, whereas phospho-mimic Amot (Amot-S175D) failed to be localized with actin. Overexpression of LATS2 caused dissociation of Amot from actin but not Amot-S175A. Mapping of the actin-binding site of Amot showed that serine 175 of Amot was important for the actin-binding activity. Amot-S175A promoted, whereas Amot and Amot-S175D inhibited, cell proliferation. These results collectively suggest that the Hippo pathway negatively regulates the actin-binding activity of Amot family members through direct phosphorylation.
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Affiliation(s)
- Siew Wee Chan
- From the Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
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Wang C, Peng J, Li H, Bi XT, Legros R, Lim CJ, Sokhansanj S. Oxidative torrefaction of biomass residues and densification of torrefied sawdust to pellets. Bioresour Technol 2013; 127:318-325. [PMID: 23131655 DOI: 10.1016/j.biortech.2012.09.092] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2012] [Revised: 09/25/2012] [Accepted: 09/25/2012] [Indexed: 06/01/2023]
Abstract
Oxidative torrefaction of sawdust with a carrier gas containing 3-6% O(2) was investigated in a TG and a fluidized bed reactor, with the properties of the torrefied sawdust and pellets compared with traditional torrefaction without any O(2), as well as the dry raw material. It is found that the oxidative torrefaction process produced torrefied sawdust and pellets of similar properties as normally torrefied sawdust and corresponding pellets, especially on the density, energy consumption for pelletization, higher heating value and energy yield. For moisture absorption and hardness of the torrefied pellets, the oxidative torrefaction process showed slightly poor but negligible performance. Therefore, it is feasible to use oxygen laden combustion flue gases as the carrier gas for torrefaction of biomass. Besides, torrefied sawdust can be made into dense and strong pellets of high hydrophobicity at a higher die temperature than normally used in the production of traditional control pellets.
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Affiliation(s)
- Congwei Wang
- Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China
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Rydin Y, Bleahu A, Davies M, Dávila JD, Friel S, De Grandis G, Groce N, Hallal PC, Hamilton I, Howden-Chapman P, Lai KM, Lim CJ, Martins J, Osrin D, Ridley I, Scott I, Taylor M, Wilkinson P, Wilson J. Shaping cities for health: complexity and the planning of urban environments in the 21st century. Lancet 2012; 379:2079-108. [PMID: 22651973 PMCID: PMC3428861 DOI: 10.1016/s0140-6736(12)60435-8] [Citation(s) in RCA: 473] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Li H, Liu X, Legros R, Bi XT, Lim CJ, Sokhansanj S. Torrefaction of sawdust in a fluidized bed reactor. Bioresour Technol 2012; 103:453-458. [PMID: 22055091 DOI: 10.1016/j.biortech.2011.10.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2011] [Revised: 10/01/2011] [Accepted: 10/02/2011] [Indexed: 05/31/2023]
Abstract
In the present work, stable fluidization of sawdust was achieved in a bench fluidized bed with an inclined orifice distributor without inert bed materials. A solids circulation pattern was established in the bed without the presence of slugging and channeling. The effects of treatment severity and weight loss on the solid product properties were identified. The decomposition of hemicelluloses was found to be responsible for the significant changes of chemical, physical and mechanical properties of the torrefied sawdust, including energy content, particle size distribution and moisture absorption capacity. The hydrophobicity of the torrefied sawdust was improved over the raw sawdust with a reduction of around 40 wt.% in saturated water uptake rate, and enhanced with increasing the treatment severity due to the decomposition of hemicelluloses which are rich in hydroxyl groups. The results in this study provided the basis for torrefaction in fluidized bed reactors.
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Affiliation(s)
- Hui Li
- Clean Energy Research Centre & Department of Chemical & Biological Engineering, University of British Columbia, Vancouver, Canada
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31
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Chan SW, Lim CJ, Chong YF, Pobbati AV, Huang C, Hong W. Hippo pathway-independent restriction of TAZ and YAP by angiomotin. J Biol Chem 2011; 286:7018-26. [PMID: 21224387 PMCID: PMC3044958 DOI: 10.1074/jbc.c110.212621] [Citation(s) in RCA: 307] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 01/10/2011] [Indexed: 01/08/2023] Open
Abstract
The Hippo pathway restricts the activity of transcriptional co-activators TAZ and YAP by phosphorylating them for cytoplasmic sequestration or degradation. In this report, we describe an independent mechanism for the cell to restrict the activity of TAZ and YAP through interaction with angiomotin (Amot) and angiomotin-like 1 (AmotL1). Amot and AmotL1 were robustly co-immunoprecipitated with FLAG-tagged TAZ, and their interaction is dependent on the WW domain of TAZ and the PPXY motif in the N terminus of Amot. Amot and AmotL1 also interact with YAP via the first WW domain of YAP. Overexpression of Amot and AmotL1 caused cytoplasmic retention of TAZ and suppressed its transcriptional outcome such as the expression of CTGF and Cyr61. Hippo refractory TAZ mutant (S89A) is also negatively regulated by Amot and AmotL1. HEK293 cells express the highest level of Amot and AmotL1 among nine cell lines examined, and silencing the expression of endogenous Amot increased the expression of CTGF and Cyr61 either at basal levels or upon overexpression of exogenous S89A. These results reveal a novel mechanism to restrict the activity of TAZ and YAP through physical interaction with Amot and AmotL1.
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Affiliation(s)
- Siew Wee Chan
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
| | - Chun Jye Lim
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
| | - Yaan Fun Chong
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
| | - Ajaybabu V. Pobbati
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
| | - Caixia Huang
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
| | - Wanjin Hong
- From the Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673 and
- the Department of Biochemistry, National University of Singapore, Singapore 119077
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Abstract
The Hippo pathway is an evolutionally conserved protein kinase cascade involved in regulating organ size in vivo and cell contact inhibition in vitro by governing cell proliferation and apoptosis. Deregulation of the Hippo pathway is linked to cancer development. Its first core kinase Warts was identified in Drosophila more than 15 years ago, but it gained much attention when other core components of the pathway were identified 8 years later. Major discoveries of the pathway were made during past several years. The core kinase components Hippo, Salvador, Warts, and Mats in the fly and Mst1/2, WW45, Lats1/2, and Mob1 in mammals phosphorylate and inactivate downstream transcriptional co-activators Yorkie in the fly, Yes-associated protein (YAP) and transcriptional co-activator with PDZ-binding motif (TAZ) in mammals, respectively. Phosphorylated Yorkie, YAP, and TAZ are sequestered in the cytoplasm by interaction with 14-3-3 proteins. Here we review recent progresses of this pathway by focusing on how these proteins communicate with each other and how loss of regulation results in cancers.
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Affiliation(s)
- Siew Wee Chan
- Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, Singapore, Republic of Singapore
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Chan SW, Lim CJ, Huang C, Chong YF, Gunaratne HJ, Hogue KA, Blackstock WP, Harvey KF, Hong W. WW domain-mediated interaction with Wbp2 is important for the oncogenic property of TAZ. Oncogene 2010; 30:600-10. [PMID: 20972459 PMCID: PMC3033532 DOI: 10.1038/onc.2010.438] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The transcriptional co-activators YAP and TAZ are downstream targets inhibited by the Hippo tumor suppressor pathway. YAP and TAZ both possess WW domains, which are important protein–protein interaction modules that mediate interaction with proline-rich motifs, most commonly PPXY. The WW domains of YAP have complex regulatory roles as exemplified by recent reports showing that they can positively or negatively influence YAP activity in a cell and context-specific manner. In this study, we show that the WW domain of TAZ is important for it to transform both MCF10A and NIH3T3 cells and to activate transcription of ITGB2 but not CTGF, as introducing point mutations into the WW domain of TAZ (WWm) abolished its transforming and transcription-promoting ability. Using a proteomic approach, we discovered potential regulatory proteins that interact with TAZ WW domain and identified Wbp2. The interaction of Wbp2 with TAZ is dependent on the WW domain of TAZ and the PPXY-containing C-terminal region of Wbp2. Knockdown of endogenous Wbp2 suppresses, whereas overexpression of Wbp2 enhances, TAZ-driven transformation. Forced interaction of WWm with Wbp2 by direct C-terminal fusion of full-length Wbp2 or its TAZ-interacting C-terminal domain restored the transforming and transcription-promoting ability of TAZ. These results suggest that the WW domain-mediated interaction with Wbp2 promotes the transforming ability of TAZ.
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Affiliation(s)
- S W Chan
- Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, Singapore
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34
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Liu CY, Zha ZY, Zhou X, Zhang H, Huang W, Zhao D, Li T, Chan SW, Lim CJ, Hong W, Zhao S, Xiong Y, Lei QY, Guan KL. The hippo tumor pathway promotes TAZ degradation by phosphorylating a phosphodegron and recruiting the SCF{beta}-TrCP E3 ligase. J Biol Chem 2010; 285:37159-69. [PMID: 20858893 DOI: 10.1074/jbc.m110.152942] [Citation(s) in RCA: 401] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The TAZ transcription co-activator promotes cell proliferation and epithelial-mesenchymal transition. TAZ is inhibited by the Hippo tumor suppressor pathway, which promotes TAZ cytoplasmic localization by phosphorylation. We report here that TAZ protein stability is controlled by a phosphodegron recognized by the F-box protein β-TrCP and ubiquitylated by the SCF/CRL1(β-TrCP) E3 ligase. The interaction between TAZ and β-TrCP is regulated by the Hippo pathway. Phosphorylation of a phosphodegron in TAZ by LATS primes it for further phosphorylation by CK1ε and subsequent binding by β-TrCP. Therefore, the Hippo pathway negatively regulates TAZ function by both limiting its nuclear accumulation and promoting its degradation. The phosphodegron-mediated TAZ degradation plays an important role in negatively regulating TAZ biological functions.
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Affiliation(s)
- Chen-Ying Liu
- Key Laboratory of Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology School of Medicine
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Igathinathane C, Tumuluru JS, Sokhansanj S, Bi X, Lim CJ, Melin S, Mohammad E. Simple and inexpensive method of wood pellets macro-porosity measurement. Bioresour Technol 2010; 101:6528-6537. [PMID: 20371174 DOI: 10.1016/j.biortech.2010.03.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2009] [Revised: 03/06/2010] [Accepted: 03/11/2010] [Indexed: 05/29/2023]
Abstract
A novel simplified stereometric measurement method for determining the macro-porosity of wood pellets through geometrical approach was successfully developed and tested. The irregular ends of pellets of circular cross-section were sanded flat so that their geometry becomes cylinder and their volumes evaluated using mensuration formula. Such formed cylindrical pellets were loose or tap filled to selected volumes to evaluate the macro-porosity and the constant specific weight. The method was extended to evaluate actual wood pellets properties. Overall macro-porosity of actual wood pellets was determined as 41.0+/-2.5% and 35.5+/-2.7%, mean bulk density as 670+/-29 kg m(-3) and 731+/-31 kg m(-3), and classified as "Class-3:Medium" and "Class-3&4:Medium to Low" for loose and tapped fills, respectively. Hausner ratio and Carr's compressibility index classify wood pellets as "freely flowing." The developed stereometric method can be used as a handy inexpensive laboratory procedure to estimate the macro-porosity of different types and makes of wood pellets and other similar packaged materials.
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Affiliation(s)
- C Igathinathane
- Department of Agricultural and Biosystems Engineering, North Dakota State University, Fargo, ND 58102, USA.
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36
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Yazdanpanah F, Sokhansanj S, Lau AK, Lim CJ, Bi X, Melin S, Afzal M. Permeability of wood pellets in the presence of fines. Bioresour Technol 2010; 101:5565-5570. [PMID: 20223658 DOI: 10.1016/j.biortech.2010.01.096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 01/14/2010] [Accepted: 01/21/2010] [Indexed: 05/28/2023]
Abstract
Broken pellets and fines are produced when pellets are handled. The resistance to air flow was measured for clean pellets and for pellets mixed with 1-20% broken pellets (fines). A pellet diameter was 6mm. The lengths ranged from 6 to 12 mm. Clean pellets were defined as particles that remained on a 4mm screen. A typical sieve analysis showed 30% of the mass of particles that passed through the 4mm screen was smaller than 1mm. The airflow rates used in the experiment ranged from 0.004 to 0.357 ms(-1). The corresponding pressure drop ranged from 1.9 to 271 Pam(-1) for clean pellets, from 4.8 to 1100 Pam(-1) for 10% fines content, and from 7.9 to 1800 Pam(-1) for 20% fines content. Coefficients of Hukill and Ives' equation were estimated for clean pellets and a multiplier was defined to calculate pressure drop for pellets mixed with fines.
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Affiliation(s)
- F Yazdanpanah
- Chemical and Biological Engineering Department, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada V6T 1Z3
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Chan SW, Lim CJ, Huang C, Chong YF, Harvey K, Hong W. Abstract LB-17: WW domain-mediated interaction with Wbp2 is important for the oncogenic property of TAZ. Cancer Res 2010. [DOI: 10.1158/1538-7445.am10-lb-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The transcriptional co-activators YAP and TAZ are downstream targets inhibited by the Hippo tumor suppressor pathway. YAP and TAZ both possess WW domains which are important protein-protein interaction modules that mediate interaction with proline-rich motifs, most commonly PPXY. The WW domains of YAP play complex regulatory roles as exemplified by two recent reports showing that they can positively or negatively influence YAP activity in a cell and context-specific fashion. In this study, we show that the WW domain of TAZ is important for it to transform both MCF10A and NIH3T3 cells and to activate transcription of ITGB2 but not CTGF, as introducing point mutations into the WW domain of TAZ (WWm) abolished its transforming and transcription-promoting ability. Using a proteomic approach we discovered potential regulatory proteins that interact with TAZ WW domain and identified Wbp2. The interaction of Wbp2 with TAZ is dependent on the WW domain of TAZ and the PPXY-containing C-terminal region of Wbp2. Knockdown of endogenous Wbp2 suppresses, whereas overexpression of Wbp2 enhances, TAZ-driven transformation. Forced interaction of WWm with Wbp2 by direct C-terminal fusion of full-length Wbp2 or its TAZ-interacting C-terminal domain restored the transforming and transcription-promoting ability of TAZ. These results suggest that the WW domain-mediated interaction with Wbp2 promotes the transforming ability of TAZ.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr LB-17.
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Affiliation(s)
- Siew Wee Chan
- 1Institute of Molecular and Cell Biology, Singapore, Singapore
| | - Chun Jye Lim
- 1Institute of Molecular and Cell Biology, Singapore, Singapore
| | - Caixia Huang
- 1Institute of Molecular and Cell Biology, Singapore, Singapore
| | - Yaan Fun Chong
- 1Institute of Molecular and Cell Biology, Singapore, Singapore
| | | | - Wanjin Hong
- 1Institute of Molecular and Cell Biology, Singapore, Singapore
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Nor Shazwani MN, Suzana S, Hanis Mastura Y, Lim CJ, Teh SC, Mohd Fauzee MZ, Lim HC, Dahlia S, Norliza M. Assessment of Physical Activity Level among Individuals with Type 2 Diabetes Mellitus at Cheras Health Clinic, Kuala Lumpur. Malays J Nutr 2010; 16:101-112. [PMID: 22691857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A cross-sectional study was carried out to assess the physical activity levels among patients with type 2 diabetes mellitus (DM) at Cheras Health Clinic in Kuala Lumpur. A total of 132 subjects (62 men and 70 women) aged 30 years and above participated in this study. Data was collected using an interview based questionnaire to obtain socio-demographic and health profile information. Physical activity was assessed using a shortened version of the International Physical Activity Questionnaire (IPAQ). Anthropometric measurements and body fat were also taken. Glycaemic status, that is, HbA1c, fasting blood sugar (FBS) and 2 hours post-prandial (2-HPP) were obtained from medical records. Results showed that the mean age of the patients was 51.9 + 5.8 years. The majority of patients had poor glycaemic control based on HbA1c (70.7%), FBS (71.9%) and 2HPP (85.4%). Patients who were unmarried and aged(60 years and above had a lower physical activity level (p< 0.05). In the older age group, low physical activity was associated with poor glycaemic control (p< 0.05). Patients in the moderate and high physical activity level were motivated to perform physical activity so as to be healthy (68.1%). Low physical activity level among patients was due to lack of time (54.5%) and lack of energy (21.2%). In conclusion, physical activity levels of the patients were unsatisfactory and associated with poor glycaemic control, especially in the elderly. There is a need to encourage diabetic patients to undertake regular physical activity in order to achieve optimal glycaemic control.
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Affiliation(s)
- M N Nor Shazwani
- Department of Nutrition and Dietetics of Allied Health Sciences, Universiti Kebangsaan Malaysia
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Abstract
The Hippo signaling pathway controls cell growth, proliferation, and apoptosis by regulating the expression of target genes that execute these processes. Acting downstream from this pathway is the YAP transcriptional coactivator, whose biological function is mediated by the conserved TEAD family transcription factors. The interaction of YAP with TEADs is critical to regulate Hippo pathway-responsive genes. Here, we describe the crystal structure of the YAP-interacting C-terminal domain of TEAD4 in complex with the TEAD-interacting N-terminal domain of YAP. The structure reveals that the N-terminal region of YAP is folded into two short helices with an extended loop containing the PXXPhiP motif in between, while the C-terminal domain of TEAD4 has an immunoglobulin-like fold. YAP interacts with TEAD4 mainly through the two short helices. Point mutations of TEAD4 indicate that the residues important for YAP interaction are required for its transforming activity. Mutagenesis reveals that the PXXPhiP motif of YAP, although making few contacts with TEAD4, is important for TEAD4 interaction as well as for the transforming activity.
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Affiliation(s)
- Liming Chen
- The Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, Proteos, Singapore
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40
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Abstract
The transcriptional coactivators YAP and TAZ are downstream targets inhibited by the Hippo tumor suppressor pathway. The expression level of TAZ is recently shown to be elevated in invasive breast cancer cells and some primary breast cancers. TAZ is important for breast cancer cell migration, invasion, and tumorigenesis, but the underlying mechanism is not defined. In this study, we show that TAZ interacts with TEAD transcriptional factors. Knockdown of TEADs suppresses TAZ-mediated oncogenic transformation of MCF10A cells. Uncoupling TAZ from Hippo regulation by S89A mutation enhances its transforming ability. Several residues located in the N-terminal region of TAZ are identified to be important for interaction with TEADs, and these same residues are equally important for TAZ to transform MCF10A cells. Mechanistically, TAZ mutants defective in interaction with TEADs fail to accumulate in the nucleus. Live cell imaging of enhanced green fluorescent protein-TAZ and its mutant defective in TEAD interaction suggests that TEAD interaction mediates nuclear retention. These results reveal a novel mechanism for TEADs to regulate nuclear retention and thus the transforming ability of TAZ.
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Affiliation(s)
- Siew Wee Chan
- Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, Singapore 138673, Singapore
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Chan SW, Lim CJ, Guo K, Ng CP, Lee I, Hunziker W, Zeng Q, Hong W. A role for TAZ in migration, invasion, and tumorigenesis of breast cancer cells. Cancer Res 2008; 68:2592-8. [PMID: 18413727 DOI: 10.1158/0008-5472.can-07-2696] [Citation(s) in RCA: 381] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
TAZ (WWTR1), identified as a 14-3-3 binding protein with a PDZ binding motif, modulates mesenchymal stem cell differentiation. We now show that TAZ plays a critical role in the migration, invasion, and tumorigenesis of breast cancer cells. TAZ is conspicuously expressed in human breast cancer cell lines in which its expression levels generally correlate with the invasiveness of cancer cells. Overexpression of TAZ in low-expressing MCF10A cells causes morphologic changes characteristic of cell transformation and promotes cell migration and invasion. Conversely, RNA interference-mediated knockdown of TAZ expression in MCF7 and Hs578T cells reduces cell migration and invasion. TAZ knockdown in MCF7 cells also retards anchorage-independent growth in soft agar and tumorigenesis in nude mice. Significantly, TAZ is overexpressed in approximately 20% of breast cancer samples. These results indicate that TAZ plays a role in the migration, invasion, and tumorigenesis of breast cancer cells and thus presents a novel target for the detection and treatment of breast cancer.
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Affiliation(s)
- Siew Wee Chan
- Cancer and Developmental Cell Biology Division, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
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Laursen K, Grace JR, Lim CJ. Enhancement of the sulfur capture capacity of limestones by the addition of Na2CO3 and NaCl. Environ Sci Technol 2001; 35:4384-4389. [PMID: 11718362 DOI: 10.1021/es0108279] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The ability of Na2CO3 and NaCl to enhance the sulfur capture capacity of three limestones was evaluated via fixed-bed calcination and sulfation experiments. The tested limestones represent three different sulfation morphologies: unreacted-core, network, and uniformly sulfated. Treatment with aqueous or powdered Na2CO3 significantly increased the Ca-utilization for two stones which normally sulfate in an unreacted-core pattern (20% to 45%) and network pattern (33% to 49%). The increase was lower for the uniformly sulfated stone (44% to 48%). Na2CO3 treatment increased the number of macropores leading to uniform sulfation of all particles, nearly eliminating the normal strong dependence of utilization on limestone type and particle size. The effect of Na2CO3 is believed to be associated with formation of a eutectic melt which enhances ionic diffusion and accelerates molecular rearrangement of the CaO. Treatment with aqueous NaCl solution caused a decrease in utilization, probably due to formation of large grains and plugging of pores caused by formation of a large amount of eutectic melt. The effect of Na2CO3 is less sensitive than that of NaCl to the amount added and the combustion environment (temperature and gas composition). In addition, Na2CO3 neither promotes corrosion nor forms chlorinated byproducts, which are main concerns associated with NaCl. Thus, Na2CO3 appears to have significant advantages over NaCl for enhancement of limestone sulfur capture capacity in fluidized-bed combustors.
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Affiliation(s)
- K Laursen
- Environmental Technology Institute, Innovation Centre (NTU), Singapore.
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Kim HG, Park KN, Cho YW, Park EH, Fuchs JA, Lim CJ. Characterization and regulation of glutathione S-transferase gene from Schizosaccharomyces pombe. Biochim Biophys Acta 2001; 1520:179-85. [PMID: 11513961 DOI: 10.1016/s0167-4781(01)00265-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A glutathione S-transferase (GST) gene has been cloned from Schizosaccharomyces pombe for the first time. The nucleotide sequence determined was found to contain 2030 base pairs including an open reading frame of 229 amino acids that would encode a protein of a molecular mass of 27017 Da. The cloned GST gene was expressed and was found to function in S. pombe, Saccharomyces cerevisiae, and Escherichia coli. The plasmid pGT207 encoding the S. pombe GST gene appeared to be able to accelerate the growth of a wild type S. pombe culture. In a culture of S. pombe containing plasmid pGT207, the growth was inhibited less by mercuric chloride than in a culture with vector alone. The 1088 bp region upstream from the GST gene as well as the region encoding the N-terminal 14 amino acids was transferred into the promoterless beta-galactosidase gene of plasmid YEp357R to yield the fusion plasmid pYSH2000. beta-Galactosidase synthesis was induced by cadmium chloride, mercuric chloride, hydrogen peroxide, and menadione. It was also induced by high temperature. These results suggest that the cloned S. pombe GST gene is involved in the oxidative stress response.
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Affiliation(s)
- H G Kim
- Division of Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, South Korea
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Wang J, Yao H, Lim CJ, Zhao Y, Yeo TJ, Hwang NH. Computational fluid dynamics study of a protruded-hinge bileaflet mechanical heart valve. J Heart Valve Dis 2001; 10:254-262; discussion 263. [PMID: 11297213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
BACKGROUND AND AIM OF THE STUDY Following clinical experience with the Medtronic Parallel bileaflet mechanical heart valve, considerable interest has been shown in investigating fluid mechanics inside the hinge socket. Most of these studies involved hinges that are recessed into the valve housing, such as the St. Jude Medical (SJM), CarboMedics, Sorin and On-X bileaflet mechanical heart valves. The aim of this study was to investigate the flow fields of a protruded hinge under steady flow conditions, with the occluder in its fully open position. Computational fluid dynamics (CFD) simulation using the Fluent 4.4.7 commercial solver was applied in this investigation. This protruded hinge mechanism for pivoting the occluder is an in-house design from the Cardiovascular Dynamics Laboratory, Nanyang Technological University. METHODS The Fluent 4.4.7 code was run on a Silicon Graphic Inc. computer (4-CPUx185 MHz) in the CFD simulation. A body-fitted coordinates (BFC) grid was generated to cover the entire valvular flow domain, including the interior of the hinge and leaflet. Clearance between the leaflet and pivot housing was 50-70 microm. In the vicinity of the protruded hinge, mesh cells were small compared with hinge dimensions. A power law distribution of grid points was applied to optimize the number of cells used to cluster the entire flow field. The overall computational flow domain of the valve channel, including the floating leaflet and immersed hinge, was approximately 170,000 cells in total. Inside the hinge socket, approximately 10,000 cells were generated. A comparative model with recessed hinge that resembled the SJM valve hinge design was modeled. Due to geometric difficulties, an unstructured grid scheme was applied. Great attention was focused within the hinge pocket, in particular to the clearance between the hinge pivot and leaflet. A total of 2 million cells was generated for the whole computational flow domain. RESULTS Under steady flow conditions, with the leaflet fixed in an open position, the protruded hinge design yielded a pair of small vortices that formed behind the stoppers. A low-magnitude velocity was observed inside the hinge clearance. Vortices developed behind the protruded stopper. Migrating flow was noted beneath the leaflet clearance as a result of pressure difference across the leaflet. For the recessed hinge design, reverse flow dominated the inside of the hinge socket, and developed into a pair of vortices at high Reynolds number. CONCLUSION The protruded hinge mechanism was designed to expose the overall hinge region to the mainstream flow for a positive washing effect. Flow in this protruded hinge design is, in general, found to be three-dimensional. Initial results under steady flow conditions showed low laminar and turbulent shear stress, while the hinge clearance was well washed.
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Affiliation(s)
- J Wang
- Cardiovascular Dynamics Laboratory, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore
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Cho YW, Kim HG, Park EH, Fuchs JA, Lim CJ. Cloning, expression and regulation of Schizosaccharomyces pombe gene encoding thioltransferase. Biochim Biophys Acta 2000; 1517:171-5. [PMID: 11118633 DOI: 10.1016/s0167-4781(00)00242-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The genomic DNA encoding thioltransferase was isolated from Schizosaccharomyces pombe using the polymerase chain reaction. The amplified DNA fragment was confirmed by Southern hybridization, completely digested with HindIII and BamHI, and then ligated into the yeast-Escherichia coli shuttle vector pRS316, which resulted in plasmid pEH1. The insert of plasmid pEH1 was transferred into the multi-copy vector YEp357 to generate plasmid pYEH1. The determined nucleotide sequence harbors an open reading frame consisting of four exons and three introns, which encodes a polypeptide of 101 amino acids with a molecular mass of 11261 Da. Thioltransferase activity was increased 1.6-fold in Saccharomyces cerevisiae containing plasmid pYEH1, and 1.8- and 2.7-fold in S. pombe containing plasmid pEH1 and pYEH1, respectively. The upstream sequence and the region encoding the N-terminal six amino acids were fused into promoterless beta-galactosidase gene of the shuttle vector YEp357R to generate the fusion plasmid pYEHR1. Synthesis of beta-galactosidase from the fusion plasmid was found to be enhanced by zinc and NO-generating S-nitroso-N-acetylpenicillamine.
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Affiliation(s)
- Y W Cho
- Division of Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, South Korea
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Hwang DY, Chae KR, Shin DH, Jang IS, Hwang JH, Kim YJ, Cho JY, Kim BJ, Goo JS, Lim CJ, Kim CK, Cho YY, Paik SG, Kim YK, Cho JS. Mammary gland tumor in transgenic mice expressing targeted beta-casein/HPV16E6 fusion gene. Int J Oncol 2000; 17:1093-8. [PMID: 11078793 DOI: 10.3892/ijo.17.6.1093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The human papillomaviruses (HPV)-16 and HPV-18 referred to as high-risk HPVs are strongly associated with anogenital malignancies as well as benign epithelial cysts. It has been demonstrated that transgenic mice carrying HPV-16 E6-E7 under the control of the MMTV LTR developed malignant tumors including salivary gland carcinoma, lymphoma, skin histiocytomas and testicular tumors in a non-mammary gland specific manner. Another regulatory unit of rat beta-casein gene can confer the expression of fusion gene preferentially in the mammary glands of transgenic mice in a developmentally regulated manner. In order to generate mammary tumor formation in transgenic mice directing HPV16E6 gene alone into the mammary gland, this regulatory unit was fused to the E6 gene of HPV-16 type to constructing fusion gene. By screening 51 newborn founder transgenic mice, three mice carrying transgenes were identified. One line termed TG32 developed in a mammary gland tumor with large subcutaneous mass in the left rib region at 17 months of age. The levels of E6 transcript in the mass-tumor of TG32 line were lower than those in non-tumor mammary gland of identical TG32 and of TG250. In each tissue of TG32 line, high expression of E6 transcript was detected both in the mammary gland and brain. Histological analysis showed that cells from mammary gland tumor of the TG32 line had also hyperplasia appearance, with irregular or increased total number of mitotic rate. These observations suggest that developing phenotype and the level of E6 transcripts in the process of malignant transformation may have different mechanisms involving the capacity to bind and destabilize p53, although for confirmation it is necessary to investigate many more transgenic mice.
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MESH Headings
- Animals
- Caseins/genetics
- Caseins/metabolism
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Viral/genetics
- Female
- Genes, Synthetic
- Mammary Glands, Animal/metabolism
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Inbred ICR
- Mice, Transgenic
- Oncogene Proteins, Viral/genetics
- Oncogene Proteins, Viral/physiology
- Organ Specificity
- Papillomaviridae/genetics
- Promoter Regions, Genetic
- Rats
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/physiology
- Repressor Proteins
- Transgenes
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- D Y Hwang
- Division of Laboratory Animal Resources, Korea Food and Drug Administration, National Institute of Toxicological Research, Seoul 122-704, Korea
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Abstract
The two promoters of Escherichia coli trxA gene were separately cloned into pKO100 as well as pJEL170. Galactokinase expression in cells containing the pKO100 derivatives was found to be negatively correlated with growth rate and was 6- to 20-fold higher in stationary cultures than in exponential cultures. The expression of trxA-galK was induced by amino acid starvation in a RelA(+) strain but not in an isogenic Rel(-) strain indicating that the control involves guanosine 3',5'-bispyrophosphate (ppGpp). RpoS, which appears to be essential for expression of most stationary phase expressed genes, is not required for trxA expression. Increased expression of relA, which increases ppGpp concentration, increases trxA expression.
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Affiliation(s)
- C J Lim
- Division of Life Sciences, Kangwon National University, Chuncheon, South Korea.
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Kim HG, Cho YW, Park EH, Park SS, Ahn KS, Lim CJ. Cloning, nucleotide sequence and expression of thioltransferase (glutaredoxin) cDNA from Schizosaccharomyces pombe. Mol Cells 1999; 9:668-72. [PMID: 10672936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Thioltransferase (TTase), also known as glutaredoxin (Grx), is an enzyme that catalyzes the reduction of a variety of disulfide compounds, including protein disulfides, in the presence of reduced glutathione. TTase acts as a cofactor for various enzymes such as ribonucleotide reductase. We previously purified a TTase from Schizosaccharomyces pombe and its molecular size was determined. In the present study, a cDNA coding TTase was isolated from a cDNA library of Schizosaccharomyces pombe by colony hybridization, which was constructed in a plasmid vector pGAD GH, and its corresponding insert was confirmed by Southern hybridization. The nucleotide sequence of the 375 bp long cDNA clone reveals an open reading frame, which encodes a protein of 101 amino acids. The coding region of the original clone was transferred after the lac promoter of pUC13 vector for expression in E. coli, and simultaneously, a suitable Shine-Dalgarno (SD) sequence was added in front of the coding region by PCR. The two primers used for PCR also separately contained BamHI and HindIII restriction sites. The E. coli strain (A434) harboring the pUC13 derivative pKU10 showed a 17.3-fold increase in TTase activity compared to the strain with only the vector plasmid.
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Affiliation(s)
- H G Kim
- Division of Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, Korea
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Cho YW, Kim JC, Jin CD, Han TJ, Lim CJ. Thioltransferase from Arabidopsis thaliana seed: purification to homogeneity and characterization. Mol Cells 1998; 8:550-5. [PMID: 9856342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Thioltransferase is a general GSH-disulfide reductase of importance for redox regulation. The protein thioltransferase has been purified to apparent homogeneity on SDS-PAGE from the Arabidopsis thaliana seed. The purification procedures included DEAE-cellulose ion exchange chromatography, Sephadex G-75 gel filtration, Q-Sepharose ion exchange chromatography, and DEAE-Sephadex A-25 ion exchange chromatography. The enzyme has a molecular mass of 22 kDa and a pI of 4.8, and it is heatstable. The protein had broad specificities for substrates ranging from low-molecular disulfides (S-sulfocysteine and cystine) to protein disulfides (trypsin and insulin). However, it could not reduce the disulfide linkages of ribonuclease A and bovine serum albumin. It could utilize non-disulfide substrates such as dehydroascorbic acid and alloxan. The protein can reduce the disulfide bond in 2-hydroxyethyl disulfide with an optimum pH of 8.5. Its activity was greatly activated by monothiol compounds such as reduced glutathione and L-cysteine.
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Affiliation(s)
- Y W Cho
- Division of Life Sciences, Kangwon National University, Chuncheon, Korea
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Kim HG, Park EH, Lim CJ. Thioltransferase from Schizosaccharomyces pombe: purification to homogeneity and some properties. Mol Cells 1998; 8:431-7. [PMID: 9749530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Two types of thioltransferase were identified in the cytosolic extract of Schizosaccharomyces pombe, a fission yeast. In the present study, the major one of them was purified to homogeneity using chromatography processes such as ion-exchange chromatography and gel filtration. Purification was monitored by the transhydrogenase activity of thioltransferase with 2-hydroxyethyl disulfide as a substrate. Its molecular weight was estimated to be about 14,000 on SDS-polyacrylamide gel electrophoresis. The purified enzyme catalyzes the reduction of various disulfide compounds such as S-sulfocysteine, L-cystine, and insulin. It was also found to contain the reducing activity on non-disulfide substrates such as dehydroascorbic acid and alloxan. Its activity was greatly activated by high concentrations of reduced glutathione. It was found to be very heat-stable as like other thioltransferases. It was characterized on other aspects such as kinetic parameters and optimal reaction conditions.
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Affiliation(s)
- H G Kim
- Division of Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, Korea
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