1
|
Alam A, Levanduski E, Bhatta M, Senchanthisai S, Sait SJ, Wang J, Abrams SIAI, Dey P. Abstract 2119: KRAS and fungi cooperate to drive IL33 secretion and type 2 immunity in the pancreatic cancer tumor microenvironment. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-2119] [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
Pancreatic ductal adenocarcinoma (PDAC) is one of the deadliest cancers, the five-year survival rate of PDAC patient is around ten percent. It is fourth largest cause of cancer related death and is projected to become the second deadliest cancer by 2030. PDAC patients generally present with advanced stage, metastatic disease that is mostly resistant to chemotherapy, radiation, and immunotherapy. A significant finding is that mutant KrasG12D (Kras*) is the primary oncogenic driver of PDAC development, and therefore efforts have been devoted to target KRAS. Here, we show in pancreatic ductal adenocarcinoma (PDAC), oncogenic KrasG12D (Kras*) increases the expression of IL33, a damage-associated molecular pattern (DAMP) molecule, member of IL1 cytokine family protein and localized in the PDAC cell nucleus, which upon secretion, chemoattracts the type 2 immunocytes. Type 2 immune cells—TH2, eosinophils and innate lymphoid cells (ILC)2, stimulate tumor growth by secreting pro-tumorigenic cytokines such as IL4, IL5 and IL13. However, the mechanisms by which type 2 immune cells traffic to the tumor microenvironment (TME) are unknown. Cancer cell-specific deletion of IL33 leads to a significant reduction in TH2 and ILC2 recruitment and lead to tumor regression. Further, we discovered that the release of IL33 requires interactions between cancer cells and the intratumoral mycobiome. PDA tumors harbors a ~3000-fold higher fungal load compared to normal pancreas in both mouse and humans. However, the mechanism of fungal mediated cytokine release is still unknown and represents a target for limiting IL33 release, and lessening PDAC tumor burden. Genetic deletion of IL33 alone or fungal depletion leads to a decrease in TH2 and ILC2 infiltration along with robust tumor regression. Moreover, repopulation of the PDAC TME with fungal species such as Alternaria and Malassezia lead to a re-infiltration of type 2 immunocytes that reinvigorates tumor growth. Notably, transplantation of tumor-derived ILC2s into mice accelerates PDAC growth. Mechanistically fungus activates dectin-1 pathway in PDAC cancer cells, mediating the release of IL33. Consistent with the murine data, IL33 expression is upregulated in approximately 20% of human PDAC, which is mainly restricted to cancer cells. Collectively, our work shows that the intratumoral mycobiome stimulates PDAC to secrete IL33, which plays a leading role in facilitating the recruitment of type 2 immunocytes that promote tumor progression.
Citation Format: Aftab Alam, Eric Levanduski, Maulasri Bhatta, Sharon Senchanthisai, Sheila Jani Sait, Jianmin Wang, Scott I. Abrams I. Abrams, Prasenjit Dey. KRAS and fungi cooperate to drive IL33 secretion and type 2 immunity in the pancreatic cancer tumor microenvironment [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 2119.
Collapse
Affiliation(s)
- Aftab Alam
- 1Roswell Park Comprehensive Cancer Center, Buffalo, NY
| | | | | | | | | | - Jianmin Wang
- 1Roswell Park Comprehensive Cancer Center, Buffalo, NY
| | | | - Prasenjit Dey
- 1Roswell Park Comprehensive Cancer Center, Buffalo, NY
| |
Collapse
|
2
|
Alam A, Levanduski E, Denz P, Villavicencio HS, Bhatta M, Alhorebi L, Zhang Y, Gomez EC, Morreale B, Senchanthisai S, Li J, Turowski SG, Sexton S, Sait SJ, Singh PK, Wang J, Maitra A, Kalinski P, DePinho RA, Wang H, Liao W, Abrams SI, Segal BH, Dey P. Fungal mycobiome drives IL-33 secretion and type 2 immunity in pancreatic cancer. Cancer Cell 2022; 40:153-167.e11. [PMID: 35120601 PMCID: PMC8847236 DOI: 10.1016/j.ccell.2022.01.003] [Citation(s) in RCA: 109] [Impact Index Per Article: 54.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 10/30/2021] [Accepted: 01/06/2022] [Indexed: 12/13/2022]
Abstract
TH2 cells and innate lymphoid cells 2 (ILC2) can stimulate tumor growth by secreting pro-tumorigenic cytokines such as interleukin-4 (IL-4), IL-5, and IL-13. However, the mechanisms by which type 2 immune cells traffic to the tumor microenvironment are unknown. Here, we show that oncogenic KrasG12D increases IL-33 expression in pancreatic ductal adenocarcinoma (PDAC) cells, which recruits and activates TH2 and ILC2 cells. Correspondingly, cancer-cell-specific deletion of IL-33 reduces TH2 and ILC2 recruitment and promotes tumor regression. Unexpectedly, IL-33 secretion is dependent on the intratumoral fungal mycobiome. Genetic deletion of IL-33 or anti-fungal treatment decreases TH2 and ILC2 infiltration and increases survival. Consistently, high IL-33 expression is observed in approximately 20% of human PDAC, and expression is mainly restricted to cancer cells. These data expand our knowledge of the mechanisms driving PDAC tumor progression and identify therapeutically targetable pathways involving intratumoral mycobiome-driven secretion of IL-33.
Collapse
Affiliation(s)
- Aftab Alam
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Eric Levanduski
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Parker Denz
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Helena Solleiro Villavicencio
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Maulasri Bhatta
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Lamees Alhorebi
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Yali Zhang
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Eduardo Cortes Gomez
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Brian Morreale
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Sharon Senchanthisai
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Jun Li
- Department of Genomic Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Steven G Turowski
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Sandra Sexton
- Department of Animal Resources, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Sheila Jani Sait
- Department of Cytogenetics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Prashant K Singh
- Genomics Shared Resource, Department of Cancer Genetics & Genomics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Jianmin Wang
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Anirban Maitra
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Pawel Kalinski
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA; Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Ronald A DePinho
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Huamin Wang
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Wenting Liao
- Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
| | - Scott I Abrams
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA
| | - Brahm H Segal
- Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Prasenjit Dey
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Elm & Carlton Sts. CGP/BLSC-L5307, Buffalo, NY 14263, USA.
| |
Collapse
|
3
|
Shenoy GN, Bhatta M, Bankert RB. Tumor-Associated Exosomes: A Potential Therapeutic Target for Restoring Anti-Tumor T Cell Responses in Human Tumor Microenvironments. Cells 2021; 10:cells10113155. [PMID: 34831378 PMCID: PMC8619102 DOI: 10.3390/cells10113155] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/10/2021] [Accepted: 11/11/2021] [Indexed: 02/07/2023] Open
Abstract
Exosomes are a subset of extracellular vesicles (EVs) that are released by cells and play a variety of physiological roles including regulation of the immune system. Exosomes are heterogeneous and present in vast numbers in tumor microenvironments. A large subset of these vesicles has been demonstrated to be immunosuppressive. In this review, we focus on the suppression of T cell function by exosomes in human tumor microenvironments. We start with a brief introduction to exosomes, with emphasis on their biogenesis, isolation and characterization. Next, we discuss the immunosuppressive effect of exosomes on T cells, reviewing in vitro studies demonstrating the role of different proteins, nucleic acids and lipids known to be associated with exosome-mediated suppression of T cell function. Here, we also discuss initial proof-of-principle studies that established the potential for rescuing T cell function by blocking or targeting exosomes. In the final section, we review different in vivo models that were utilized to study as well as target exosome-mediated immunosuppression, highlighting the Xenomimetic mouse (X-mouse) model and the Omental Tumor Xenograft (OTX) model that were featured in a recent study to evaluate the efficacy of a novel phosphatidylserine-binding molecule for targeting immunosuppressive tumor-associated exosomes.
Collapse
Affiliation(s)
- Gautam N. Shenoy
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY 14203, USA;
| | - Maulasri Bhatta
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA;
| | - Richard B. Bankert
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY 14203, USA;
- Correspondence: ; Tel.: +1-716-829-2701
| |
Collapse
|
4
|
Bhatta M, Shenoy GN, Loyall JL, Gray BD, Bapardekar M, Conway A, Minderman H, Kelleher RJ, Carreno BM, Linette G, Shultz LD, Odunsi K, Balu-Iyer SV, Pak KY, Bankert RB. Novel phosphatidylserine-binding molecule enhances antitumor T-cell responses by targeting immunosuppressive exosomes in human tumor microenvironments. J Immunother Cancer 2021; 9:jitc-2021-003148. [PMID: 34599030 PMCID: PMC8488709 DOI: 10.1136/jitc-2021-003148] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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] [Accepted: 08/21/2021] [Indexed: 12/21/2022] Open
Abstract
Background The human tumor microenvironment (TME) is a complex and dynamic milieu of diverse acellular and cellular components, creating an immunosuppressive environment, which contributes to tumor progression. We have previously shown that phosphatidylserine (PS) expressed on the surface of exosomes isolated from human TMEs is causally linked to T-cell immunosuppression, representing a potential immunotherapeutic target. In this study, we investigated the effect of ExoBlock, a novel PS-binding molecule, on T-cell responses in the TME. Methods We designed and synthesized a new compound, (ZnDPA)6-DP-15K, a multivalent PS binder named ExoBlock. The PS-binding avidity of ExoBlock was tested using an in vitro competition assay. The ability of this molecule to reverse exosome-mediated immunosuppression in vitro was tested using human T-cell activation assays. The in vivo therapeutic efficacy of ExoBlock was then tested in two different human tumor xenograft models, the melanoma-based xenomimetic (X-)mouse model, and the ovarian tumor-based omental tumor xenograft (OTX) model. Results ExoBlock was able to bind PS with high avidity and was found to consistently and significantly block the immunosuppressive activity of human ovarian tumor and melanoma-associated exosomes in vitro. ExoBlock was also able to significantly enhance T cell-mediated tumor suppression in vivo in both the X-mouse and the OTX model. In the X-mouse model, ExoBlock suppressed tumor recurrence in a T cell-dependent manner. In the OTX model, ExoBlock treatment resulted in an increase in the number as well as function of CD4 and CD8 T cells in the TME, which was associated with a reduction in tumor burden and metastasis, as well as in the number of circulating PS+ exosomes in tumor-bearing mice. Conclusion Our results establish that targeting exosomal PS in TMEs with ExoBlock represents a promising strategy to enhance antitumor T-cell responses.
Collapse
Affiliation(s)
| | - Gautam N Shenoy
- Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York, USA
| | - Jenni L Loyall
- Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York, USA
| | - Brian D Gray
- Molecular Targeting Technologies Inc, West Chester, Pennsylvania, USA
| | - Meghana Bapardekar
- Flow & Image Cytometry Shared Resource, Roswell Park Comprehensive Cancer Center, Buffalo, New York, USA
| | - Alexis Conway
- Flow & Image Cytometry Shared Resource, Roswell Park Comprehensive Cancer Center, Buffalo, New York, USA
| | - Hans Minderman
- Flow & Image Cytometry Shared Resource, Roswell Park Comprehensive Cancer Center, Buffalo, New York, USA
| | - Raymond J Kelleher
- Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York, USA
| | - Beatriz M Carreno
- Center for Cellular Immunotherapies, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Gerald Linette
- Center for Cellular Immunotherapies, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | | | - Kunle Odunsi
- University of Chicago Biological Sciences Division, Chicago, Illinois, USA
| | - Sathy V Balu-Iyer
- Department of Pharmaceutical Sciences, University at Buffalo-The State University of New York, Buffalo, New York, USA
| | - Koon Yan Pak
- Molecular Targeting Technologies Inc, West Chester, Pennsylvania, USA
| | - Richard B Bankert
- Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York, USA
| |
Collapse
|
5
|
Pototskaya IV, Shamanin VP, Shepelev SS, Bhatta M, Morgounov AI. Analysis of the Genome D Polymorphism of Synthetic Wheat Obtained on the Basis of Ae. tauschii L. RUSS J GENET+ 2021. [DOI: 10.1134/s1022795421020083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
6
|
Shenoy GN, Greene CJ, Bhatta M, Baroja ML, Loyall JL, Balu‐Iyer SV, Kelleher RJ, Carreno BM, Linette GP, Shultz LD, Bankert RB. Preclinical evaluation of cancer immune therapy using patient-derived tumor antigen-specific T cells in a novel xenograft platform. Clin Transl Immunology 2021; 10:e1246. [PMID: 33552509 PMCID: PMC7853904 DOI: 10.1002/cti2.1246] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 09/29/2020] [Revised: 12/16/2020] [Accepted: 01/09/2021] [Indexed: 01/07/2023] Open
Abstract
OBJECTIVES With a rapidly growing list of candidate immune-based cancer therapeutics, there is a critical need to generate highly reliable animal models to preclinically evaluate the efficacy of emerging immune-based therapies, facilitating successful clinical translation. Our aim was to design and validate a novel in vivo model (called Xenomimetic or 'X' mouse) that allows monitoring of the ability of human tumor-specific T cells to suppress tumor growth following their entry into the tumor. METHODS Tumor xenografts are established rapidly in the greater omentum of globally immunodeficient NOD-scid IL2Rγnull (NSG) mice following an intraperitoneal injection of melanoma target cells expressing tumor neoantigen peptides, as well as green fluorescent protein and/or luciferase. Changes in tumor burden, as well as in the number and phenotype of adoptively transferred patient-derived tumor neoantigen-specific T cells in response to immunotherapy, are measured by imaging to detect fluorescence/luminescence and flow cytometry, respectively. RESULTS The tumors progress rapidly and disseminate in the mice unless patient-derived tumor-specific T cells are introduced. An initial T cell-mediated tumor arrest is later followed by a tumor escape, which correlates with the upregulation of the checkpoint molecules programmed cell death-1 (PD-1) and lymphocyte-activation gene 3 (LAG3) on T cells. Treatment with immune-based therapies that target these checkpoints, such as anti-PD-1 antibody (nivolumab) or interleukin-12 (IL-12), prevented or delayed the tumor escape. Furthermore, IL-12 treatment suppressed PD-1 and LAG3 upregulation on T cells. CONCLUSION Together, these results validate the X-mouse model and establish its potential to preclinically evaluate the therapeutic efficacy of immune-based therapies.
Collapse
Affiliation(s)
- Gautam N Shenoy
- Department of Microbiology and Immunology at the Jacobs School of Medicine and Biomedical SciencesUniversity at BuffaloBuffaloNYUSA
| | - Christopher J Greene
- Department of Microbiology and Immunology at the Jacobs School of Medicine and Biomedical SciencesUniversity at BuffaloBuffaloNYUSA,Present address:
Hodgson Russ LLP.BuffaloNYUSA
| | - Maulasri Bhatta
- Immune Modulatory Therapies, LLCEdenNYUSA,Present address:
Roswell Park Comprehensive Cancer CenterBuffaloNYUSA
| | - Miren L Baroja
- Center for Cellular ImmunotherapiesPerelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Jenni L Loyall
- Department of Microbiology and Immunology at the Jacobs School of Medicine and Biomedical SciencesUniversity at BuffaloBuffaloNYUSA
| | - Sathy V Balu‐Iyer
- Department of Pharmaceutical SciencesUniversity at BuffaloBuffaloNYUSA
| | - Raymond J Kelleher
- Department of Microbiology and Immunology at the Jacobs School of Medicine and Biomedical SciencesUniversity at BuffaloBuffaloNYUSA
| | - Beatriz M Carreno
- Center for Cellular ImmunotherapiesPerelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Gerald P Linette
- Center for Cellular ImmunotherapiesPerelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | | | - Richard B Bankert
- Department of Microbiology and Immunology at the Jacobs School of Medicine and Biomedical SciencesUniversity at BuffaloBuffaloNYUSA
| |
Collapse
|
7
|
Shenoy GN, Bhatta M, Loyall JL, Kelleher RJ, Bernstein JM, Bankert RB. Exosomes Represent an Immune Suppressive T Cell Checkpoint in Human Chronic Inflammatory Microenvironments. Immunol Invest 2020; 49:726-743. [PMID: 32299258 PMCID: PMC7554261 DOI: 10.1080/08820139.2020.1748047] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 01/07/2023]
Abstract
Background: T cells present in chronic inflammatory tissues such as nasal polyps (from chronic rhinosinusitis patients) have been demonstrated to be hypo-responsive to activation via the TCR, similar to tumor-specific T cells in multiple different human tumor microenvironments. While immunosuppressive exosomes have been known to contribute to the failure of the tumor-associated T cells to respond optimally to activation stimuli, it is not known whether they play a similar role in chronic inflammatory microenvironments. In the current study, we investigate whether exosomes derived from chronic inflammatory microenvironments contribute to the immune suppression of T cells. Methods: Exosomes were isolated by ultracentrifugation and characterized by size and composition using nanoparticle tracking analysis, scanning electron microscopy, antibody arrays and flow exometry. Immunosuppressive ability of the exosomes was measured by quantifying its effect on activation of T cells, using nuclear translocation of NFκB as an activation endpoint. Results: Exosomes were isolated and characterized from two different types of chronic inflammatory tissues - nasal polyps from chronic rhinosinusitis patients and synovial fluid from rheumatoid arthritis patients. These exosomes arrest the activation of T cells stimulated via the TCR. This immune suppression, like that which is seen in tumor microenvironments, is dependent in part upon a lipid, ganglioside GD3, which is expressed on the exosomal surface. Conclusion: Immunosuppressive exosomes present in non-malignant chronic inflammatory tissues represent a new T cell checkpoint, and potentially represent a novel therapeutic target to enhance the response to current therapies and prevent disease recurrences.
Collapse
Affiliation(s)
- Gautam N Shenoy
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | | | - Jenni L Loyall
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | - Raymond J Kelleher
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | - Joel M Bernstein
- Department of Otolaryngology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | - Richard B Bankert
- Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| |
Collapse
|
8
|
Yadav S, Rai B, Bhatta M, Thakur J. MON-313 PROFILE OF NEPHROTIC SYNDROME ATTENDING PEDIATRIC RENAL CLINIC: A SINGLE CENTER EXPERIENCE. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.1124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
9
|
Bhatta M, Ma JH, Wang JJ, Sakowski J, Zhang SX. Enhanced endoplasmic reticulum stress in bone marrow angiogenic progenitor cells in a mouse model of long-term experimental type 2 diabetes. Diabetologia 2015; 58:2181-90. [PMID: 26063198 PMCID: PMC4529381 DOI: 10.1007/s00125-015-3643-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 05/01/2015] [Indexed: 01/08/2023]
Abstract
AIMS/HYPOTHESIS Bone marrow-derived circulating angiogenic cells (CACs) play an important role in vascular repair. In diabetes, compromised functioning of the CACs contributes to the development of diabetic retinopathy; however, the underlying mechanisms are poorly understood. We examined whether endoplasmic reticulum (ER) stress, which has recently been linked to endothelial injury, is involved in diabetic angiogenic dysfunction. METHODS Flow cytometric analysis was used to quantify bone marrow-derived progenitors (Lin(-)/c-Kit(+)/Sca-1(+)/CD34(+)) and blood-derived CACs (Sca-1(+)/CD34(+)) in 15-month-old Lepr (db) (db/db) mice and in their littermate control (db/+) mice used as a model of type 2 diabetes. Markers of ER stress in diabetic (db/db) and non-diabetic (db/+) bone marrow-derived early outgrowth cells (EOCs) and retinal vascular density were measured. RESULTS The numbers of bone-marrow progenitors and CACs were significantly reduced in db/db mice. Vascular density was markedly decreased in the retinas of db/db mice, and this was accompanied by vascular beading. Microglial activation was enhanced, as was the production of hypoxia inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF). The production of ER stress markers (glucose-regulated protein-78 [GRP-78], phosphorylated inositol-requiring enzyme-1α [p-IRE-1α], phosphorylated eukaryotic translation initiation factor-2α [p-eIF2α], activating transcription factor-4 [ATF4], C/EBP homologous protein [CHOP] and spliced X-box binding protein-1 [XBP1s]) was significantly increased in bone marrow-derived EOCs from db/db mice. In addition, mouse EOCs cultured in high-glucose conditions demonstrated higher levels of ER stress, reduced colony formation, impaired migration and increased apoptosis, all of which were largely prevented by the chemical chaperone 4-phenylbutyrate. CONCLUSIONS/INTERPRETATION Taken together, our results indicate that diabetes increases ER stress in bone marrow angiogenic progenitor cells. Thus, targeting ER stress may offer a new approach to improving angiogenic progenitor cell function and promoting vascular repair in diabetes.
Collapse
Affiliation(s)
- Maulasri Bhatta
- Department of Ophthalmology, University at Buffalo, State University of New York, 3435 Main Street, Buffalo, NY, 14214, USA
| | | | | | | | | |
Collapse
|
10
|
Bhatta M. A Prospective, Cross-Sectional Study On Cost And Adherence Of Antidiabetic Prescriptions At A Tertiary Care Teaching Hospital In South India. Value Health 2014; 17:A746. [PMID: 27202697 DOI: 10.1016/j.jval.2014.08.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- M Bhatta
- Raghavendra Institute of Pharmaceutical Education & Research, Anantapur, India
| |
Collapse
|