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Liu Y, Corrales-Guerrero S, Kuo JC, Robb R, Nagy G, Cui T, Lee RJ, Williams TM. Improved Targeting and Safety of Doxorubicin through a Novel Albumin Binding Prodrug Approach. ACS OMEGA 2024; 9:977-987. [PMID: 38222540 PMCID: PMC10785662 DOI: 10.1021/acsomega.3c07163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/08/2023] [Accepted: 12/12/2023] [Indexed: 01/16/2024]
Abstract
Human serum albumin (HSA) improves the pharmacokinetic profile of drugs attached to it, making it an attractive carrier with proven clinical success. In our previous studies, we have shown that Caveolin-1 (Cav-1) and caveolae-mediated endocytosis play important roles in the uptake of HSA and albumin-bound drugs. Doxorubicin is an FDA-approved chemotherapeutic agent that is effective against multiple cancers, but its clinical applicability has been hampered by its high toxicity levels. In this study, a doxorubicin-prodrug was developed that could independently and avidly bind HSA in circulation, called IPBA-Dox. We first developed and characterized IPBA-Dox and confirmed that it can bind albumin in vitro while retaining a potent cytotoxic effect. We then verified that it efficiently binds to HSA in circulation, leading to an improvement in the pharmacokinetic profile of the drug. In addition, we tested our prodrug for Cav-1 selectivity and found that it preferentially affects cells that express relatively higher levels of Cav-1 in vitro and in vivo. Moreover, we found that our compound was well tolerated in vivo at concentrations at which doxorubicin was lethal. Altogether, we have developed a doxorubicin-prodrug that can successfully bind HSA, retaining a strong cytotoxic effect that preferentially targets Cav-1 positive cells while improving the general tolerability of the drug.
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Affiliation(s)
- Yang Liu
- Division
of Pharmaceutics and Pharmacology, The Ohio
State University, Columbus, Ohio 43210-1132, United States
| | - Sergio Corrales-Guerrero
- Biomedical
Sciences Graduate Program, The Ohio State
University, Columbus, Ohio 43210-1132, United States
| | - Jimmy C. Kuo
- Division
of Pharmaceutics and Pharmacology, The Ohio
State University, Columbus, Ohio 43210-1132, United States
| | - Ryan Robb
- University
of North Carolina, Chapel
Hill, North Carolina 27514-3916, United States
| | - Gregory Nagy
- Biomedical
Sciences Graduate Program, The Ohio State
University, Columbus, Ohio 43210-1132, United States
| | - Tiantian Cui
- Department
of Radiation Oncology, City of Hope National
Medical Center, Duarte, California 91010, United States
| | - Robert J. Lee
- Division
of Pharmaceutics and Pharmacology, The Ohio
State University, Columbus, Ohio 43210-1132, United States
| | - Terence M. Williams
- Department
of Radiation Oncology, City of Hope National
Medical Center, Duarte, California 91010, United States
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Zeng Y, Chen M, Ganesh S, Hu S, Chen H. Clinicopathological and prognostic significance of caveolin-1 and ATG4C expression in the epithelial ovarian cancer. PLoS One 2020; 15:e0232235. [PMID: 32401768 PMCID: PMC7219755 DOI: 10.1371/journal.pone.0232235] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 04/09/2020] [Indexed: 12/24/2022] Open
Abstract
Objective Altered expression of caveolin-1 (CAV1) and autophagy marker ATG4C is observed in various types of human cancers. However, the clinical significance of CAV1 and ATG4C expression in epithelial ovarian cancer (EOC) remains largely unknown. The present study aims to explore the clinicopathological value and prognostic significance of CAV1 and ATG4C expression in EOC. Methods The expression pattern and prognostic value of CAV1 and ATG4C mRNA in EOC were analyzed using data from the Cancer Genome Atlas (TCGA) database (N = 373). In addition, immunohistochemistry analysis was performed to detect and assay the expression of CAV1 and ATG4C proteins in tissue microarray of EOC. Results Based on TCGA data, Kaplan-Meier analysis indicated that patients with low CAV1 mRNA (p = 0.021) and high ATG4C mRNA (p = 0.018) expression had a significantly shorter overall survival (OS). Cox regression analysis demonstrated that the expression levels of CAV1 (p = 0.023) and ATG4C mRNA (p = 0.040) were independent prognostic factors for OS in EOC. In addition, the Concordance Index of the nomogram for OS prediction was 0.660. Immunohistochemical analysis showed the expression levels of stromal CAV1 and cancerous ATG4C proteins, and high expression of both CAV1 and ATG4C protein in the stroma were found to significantly correlate with the histologic subtypes of EOC, especially with serous subtype. Conclusions Decreased expression of CAV1 mRNA and increased expression of ATG4C mRNA in EOC can predict poor overall survival. The expression levels of CAV1 protein in stromal cells and ATG4C protein in cancer cells are significantly associated with histologic subtypes of EOC. These findings suggest that CAV1 and ATG4C serve as useful prognostic biomarkers and candidate therapeutic targets in EOC.
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Affiliation(s)
- Yuyang Zeng
- Department of Pathology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Mengxi Chen
- Department of Pathology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Sridha Ganesh
- Department of Pathology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei Province, P. R. China
| | - Shunze Hu
- Department of Pathology, Maternal and Child Health Hospital of Hubei, Wuhan, Hubei Province, P. R. China
- * E-mail: (SH); (HC)
| | - Honglei Chen
- Department of Pathology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei Province, P. R. China
- Department of Pathology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, P. R. China
- * E-mail: (SH); (HC)
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Stromal Caveolin-1 and Caveolin-2 Expression in Primary Tumors and Lymph Node Metastases. Anal Cell Pathol (Amst) 2018; 2018:8651790. [PMID: 29850392 PMCID: PMC5914130 DOI: 10.1155/2018/8651790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 01/23/2018] [Indexed: 12/26/2022] Open
Abstract
The expression of caveolin-1 (CAV1) in both tumor cell and cancer-associated fibroblasts (CAFs) has been found to correlate with tumor aggressiveness in different epithelial tumor entities, whereas less is known for caveolin-2 (CAV2). The aim of this study was to investigate the clinicopathological significance and prognostic value of stromal CAV1 and CAV2 expression in lung cancer. The expression of these two genes was investigated at protein level on a tissue microarray (TMA) consisting of 161 primary tumor samples. 50.7% of squamous cell lung cancer (SCC) tumors showed strong expression of CAV1 in the tumor-associated stromal cells, whereas only 15.1% of adenocarcinomas (AC) showed a strong CAV1 expression (p < 0.01). A strong CAV2 stromal expression was found in 46.0% of the lung tumor specimens, with no significant difference between the subtypes. Neither CAV1 nor CAV2 stromal expression was associated with any other clinicopathological factor including survival. When the stromal expression in matched primary tumors and lymph node metastases was compared, both CAV1 and CAV2 expressions were frequently found lost in the corresponding stroma of the lymph node metastasis (40.6%, p = 0.003 and 38.4%, p = 0.001, resp.). Loss of stromal CAV2 in the lymph node metastases was also significantly associated with earlier death (p = 0.011). In conclusion, in contrast to the expression patterns in the tumor tissue of lung cancer, stromal expression of CAV1 in primary tumors was not associated with clinical outcome whereas the stromal expression of especially CAV2 in the metastatic lymph nodes could be associated with lung cancer pathogenesis.
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High expression of synthesis of cytochrome c oxidase 2 and TP53-induced glycolysis and apoptosis regulator can predict poor prognosis in human lung adenocarcinoma. Hum Pathol 2018; 77:54-62. [PMID: 29634976 DOI: 10.1016/j.humpath.2017.12.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 12/10/2017] [Accepted: 12/15/2017] [Indexed: 01/08/2023]
Abstract
Synthesis of cytochrome c oxidase 2 (SCO2) and TP53-induced glycolysis and apoptosis regulator (TIGAR) are 2 p53-mediated proteins that can play a regulatory role in cancer energy metabolism. However, no study has examined the association of SCO2 and TIGAR with the prognosis of patients with lung adenocarcinoma (AC). In our study, the expression of SCO2 and TIGAR proteins in lung AC was detected, and the potential relation to prognosis was evaluated, aiming to take a further view of lung AC progression. Quantum dots-based immunofluorescence histochemistry staining was performed to observe the expression of p53, SCO2, and TIGAR in 75 specimens of lung AC. Of these, 51 (68.0%) showed high expression of SCO2, and 59 (78.7%) showed high expression of TIGAR. High TIGAR expression was significantly associated with a history of smoking (P = .017) and being male (P = .006). The correlation between high SCO2 expression and age also was significant (P = .042). Moreover, high TIGAR expression was positively correlated with high SCO2 expression (P = .019; rs = 0.271). High expression of the SCO2 and TIGAR proteins predicted poorer survival and a higher mortality rate (P = .024 and .030, respectively). High expression of SCO2 and TIGAR proteins is significantly associated with lung AC progression, suggesting their potential use as prognostic markers and therapeutic targets.
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Wang A, Zhao C, Liu X, Su W, Duan G, Xie Z, Chu S, Gao Y. Knockdown of TBRG4 affects tumorigenesis in human H1299 lung cancer cells by regulating DDIT3, CAV1 and RRM2. Oncol Lett 2017; 15:121-128. [PMID: 29387213 PMCID: PMC5769239 DOI: 10.3892/ol.2017.7328] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 08/23/2017] [Indexed: 01/14/2023] Open
Abstract
The transforming growth factor β regulator 4 (TBRG4) gene, located on the 7p14-p13 chromosomal region, is implicated in numerous types of cancer. However, the contribution(s) of TBRG4 in human lung cancer remains unknown. In the present study, the expression of TBRG4 mRNA was investigated in the H1299 lung cancer cell line using the quantitative polymerase chain reaction (qPCR) following the knockdown of TBRG4 by a lentivirus-mediated small interfering RNA (siRNA). Results identified that the expression of TBRG4 within H1299 cells was significantly suppressed (P<0.01) by RNA interference, and 586 genes were differentially expressed following TBRG4 silencing. Ingenuity Pathway Analysis (IPA) revealed that these genes were often associated with infectious diseases, organismal injury, abnormalities and cancer functional networks. Further IPA of these networks revealed that TBRG4 knockdown in H1299 cells deregulated the expression of 21 downstream genes, including the upregulation of DNA damage-inducible transcript 3 (DDIT3), also termed CCAAT/enhancer-binding protein homologous protein, and downregulation of caveolin 1 (CAV1) and ribonucleotide reductase regulatory subunit M2 (RRM2). Results were validated using qPCR and western blotting. Furthermore, immunohistochemical staining of TBRG4 protein identified that expression was markedly increased in carcinoma compared with in normal tissue. In conclusion, TBRG4 serves a role in the tumorigenesis of lung cancer via deregulation of DDIT3, CAV1 and RRM2. The results of the present study may be important in contributing to our understanding of TBRG4 as a target for lung cancer treatment.
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Affiliation(s)
- Ansheng Wang
- Shandong University School of Medicine, Jinan, Shandong 250100, P.R. China.,Department of Thoracic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Chengling Zhao
- Shandong University School of Medicine, Jinan, Shandong 250100, P.R. China
| | - Xuegang Liu
- Department of Cardiac Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Wen Su
- Department of Medical Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Guixin Duan
- Department of Thoracic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Zongyu Xie
- Department of Radiology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Shanshan Chu
- Department of Thoracic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Yuan Gao
- Department of Thoracic Surgery, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
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Chatterjee M, Ben-Josef E, Robb R, Vedaie M, Seum S, Thirumoorthy K, Palanichamy K, Harbrecht M, Chakravarti A, Williams TM. Caveolae-Mediated Endocytosis Is Critical for Albumin Cellular Uptake and Response to Albumin-Bound Chemotherapy. Cancer Res 2017; 77:5925-5937. [PMID: 28923854 DOI: 10.1158/0008-5472.can-17-0604] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 07/03/2017] [Accepted: 09/06/2017] [Indexed: 01/04/2023]
Abstract
Nab-paclitaxel, a nanoparticle conjugate of paclitaxel to human albumin, exhibits efficacy in pancreatic cancer, non-small cell lung cancer and breast cancer. However, there is a lack of predictive biomarkers to identify patients who might benefit most from its administration. This study addresses this gap in knowledge by identifying that caveolin-1 (Cav-1) is a candidate mechanism-based biomarker. Caveolae are small membrane invaginations important for transendothelial albumin uptake. Cav-1, the principal structural component of caveolae, is overexpressed in the cancers noted above that respond to nab-paclitaxel. Thus, we hypothesized that Cav-1 may be critical for albumin uptake in tumors and perhaps determine their response to this drug. Cav-1 protein levels correlated positively with nab-paclitaxel sensitivity. RNAi-mediated attenuation of Cav-1 expression reduced uptake of albumin and nab-paclitaxel in cancer cells and rendered them resistant to nab-paclitaxel-induced apoptosis. Conversely, Cav-1 overexpression enhanced sensitivity to nab-paclitaxel. Selection for cellular resistance to nab-paclitaxel in cell culture correlated with a loss of Cav-1 expression. In mouse xenograft models, cancer cells, where Cav-1 was attenuated, exhibited resistance to the antitumor effects of nab-paclitaxel therapy. Overall, our findings suggest Cav-1 as a predictive biomarker for the response to nab-paclitaxel and other albumin-based cancer therapeutic drugs. Cancer Res; 77(21); 5925-37. ©2017 AACR.
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Affiliation(s)
- Moumita Chatterjee
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Edgar Ben-Josef
- Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ryan Robb
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Marall Vedaie
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Star Seum
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Krishnan Thirumoorthy
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Kamalakannan Palanichamy
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Matthew Harbrecht
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Arnab Chakravarti
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio
| | - Terence M Williams
- The Ohio State University Medical Center, Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute, Columbus, Ohio.
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7
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Qu B, Yao L, Ma HL, Chen HL, Zhang Z, Xie J. Prognostic significance of autophagy-related proteins expression in resected human gastric adenocarcinoma. ACTA ACUST UNITED AC 2017; 37:37-43. [PMID: 28224423 DOI: 10.1007/s11596-017-1691-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 01/10/2017] [Indexed: 12/19/2022]
Abstract
Gastric adenocarcinoma (GC) is one of the most common malignancies in the world and one of the most frequent causes of cancer-related death. Autophagy is a highly regulated catabolic pathway responsible for the degradation of long-lived proteins and damaged intracellular organelles. However, the mechanism and guiding significance of autophagy in the development and progression of GC have remained to be elucidated. This study aimed to explore the clinicopathological significances and prognostic values of autophagy-related proteins AMBRA1 and Beclin-1 in GC. Quantum dots based immunofluorescence histochemistry (QDs-IHC) was performed to observe the expression of AMBRA1 and Beclin-1 proteins in the tissue microarrays including 163 specimens of GC and 20 noncancerous gastric tissues. Simultaneously, AMBRA1 and Beclin-1 proteins were detected by Western blotting in the 10 fresh GC and corresponding normal gastric tissues. The results showed that the expression levels of both AMBRA1 and Beclin-1 proteins were higher in GC tissues than in noncancerous gastric tissues by QDs-IHC and Western blotting (P<0.05). High AMBRA1 expression was detected in 90 of 163 (55.2%) GCs and high Beclin-1 expression was detected in 83 of 163 (50.9%) GCs. High AMBRA1 expression was closely related to depth of invasion, and lymph nodes metastasis (P<0.05). High expression of Beclin-1 protein was correlated with tumor grade (P<0.05). Positive correlation was observed between AMBRA1 and Beclin-1. Survival analysis indicated the high expression of AMBRA1 and Beclin- 1 was an independent factor in predicting poor overall survival (OS) of GC patients. These findings suggest the high expression of AMBRA1 and Beclin-1 proteins is significantly correlated with GC progression. High AMBRA1 and Beclin-1 expression heralds worse outcome of GC patients, suggesting a novel candidate prognostic marker and a therapeutic target for GC.
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Affiliation(s)
- Bing Qu
- Department of General Surgery, China Resources & WISCO General Hospital, Wuhan, 430080, China
| | - Lei Yao
- Department of General Surgery, China Resources & WISCO General Hospital, Wuhan, 430080, China
| | - Hua-Ling Ma
- Department of Pathology, China Resources & WISCO General Hospital, Wuhan, 430080, China
| | - Hong-Lei Chen
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan, 430071, China
| | - Zhi Zhang
- Department of Science and Education, China Resources & WISCO General Hospital, Wuhan, 430080, China.
| | - Jiang Xie
- Department of General Surgery, China Resources & WISCO General Hospital, Wuhan, 430080, China.
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Caiola E, Marrazzo E, Alesci S, Broggini M, Marabese M. ∆Np73beta induces caveolin-1 in human non-small cell lung cancer cell line H1299. Tumour Biol 2015; 37:2015-21. [PMID: 26337278 DOI: 10.1007/s13277-015-4012-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 08/27/2015] [Indexed: 11/26/2022] Open
Abstract
Caveolins have recently attracted attention for their possible involvement in signal transduction. Their role in cancer is debated, being reported both a suppressive and oncogenic role in different experimental conditions. Caveolin-1 is regulated by the tumor suppressor p53 which is able to bind its promoter and activate transcription. We had previous evidences indicating that a specific p73 isoform, namely ∆Np73β, when overexpressed in NCI-H1299 induced growth arrest and cell death. By gene expression analysis in cell transiently overexpressed with ∆Np73β, a strong induction of caveolin-1 was found. Caveolin was induced both at mRNA and protein level, and we characterised the promoter sequence of the gene encoding for caveolin-1 and found that the promoter region containing the putative p53 (and hence p73) binding sequence was responsive to ∆Np73β, but not to ∆Np73α and ∆Np73γ which do not induce growth arrest as ∆Np73β does. A reduction in cell adhesion was observed in ∆Np73β overexpressing cells, again supporting a possible role of caveolins in determining these effects. By using specific siRNA directed against human caveolin-1, we could not however antagonize the effects induced by ∆Np73β. Although caveolin-1 represents one of the genes whose expression is strongly activated by ∆Np73β, we could not define a role of caveolin-1 as a mediator of ∆Np73β associated growth arrest. It could well be that the expression of caveolin-1 is able to mediate other activities of ∆Np73β, and studies are in progress to determine whether its expression is mainly associated to metastatic spread.
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Affiliation(s)
- Elisa Caiola
- Laboratory of Molecular Pharmacology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", via G. La Masa 19, 20156, Milan, Italy
| | - Eleonora Marrazzo
- Laboratory of Molecular Pharmacology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", via G. La Masa 19, 20156, Milan, Italy
| | - Simona Alesci
- Laboratory of Molecular Pharmacology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", via G. La Masa 19, 20156, Milan, Italy
| | - Massimo Broggini
- Laboratory of Molecular Pharmacology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", via G. La Masa 19, 20156, Milan, Italy.
| | - Mirko Marabese
- Laboratory of Molecular Pharmacology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", via G. La Masa 19, 20156, Milan, Italy
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Kilvaer TK, Paulsen EE, Hald SM, Wilsgaard T, Bremnes RM, Busund LT, Donnem T. Lymphangiogenic Markers and Their Impact on Nodal Metastasis and Survival in Non-Small Cell Lung Cancer--A Structured Review with Meta-Analysis. PLoS One 2015; 10:e0132481. [PMID: 26305218 PMCID: PMC4549062 DOI: 10.1371/journal.pone.0132481] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 06/15/2015] [Indexed: 12/17/2022] Open
Abstract
Background In non-small cell lung cancer (NSCLC), nodal metastasis is an adverse prognostic factor. Several mediating factors have been implied in the development of nodal metastases and investigated for predictive and prognostic properties in NSCLC. However, study results differ. In this structured review and meta-analysis we explore the published literature on commonly recognized pathways for molecular regulation of lymphatic metastasis in NSCLC. Methods A structured PubMed search was conducted for papers reporting on the expression of known markers of lymhangiogenesis in NSCLC patients. Papers of sufficient quality, presenting survival and/or correlation data were included. Results High levels of vascular endothelial growth factor C (VEGF-C, HR 1.57 95% CI 1.34–1.84) and high lymphatic vascular density (LVD, HR 1.84 95% CI 1.18–2.87) were significant prognostic markers of poor survival and high expression of VEGF-C, vascular endothelial growth factor receptor 3 (VEGFR3) and LVD was associated with lymph node metastasis in NSCLC. Conclusion Lymphangiogenic markers are prognosticators of survival and correlate with lymph node metastasis in NSCLC. Their exact role and clinical implications should be further elucidated.
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Affiliation(s)
- Thomas K. Kilvaer
- Department of Oncology, University Hospital of North Norway, Tromso, Norway
- Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromso, Norway
- * E-mail:
| | - Erna-Elise Paulsen
- Department of Oncology, University Hospital of North Norway, Tromso, Norway
- Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromso, Norway
| | - Sigurd M. Hald
- Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromso, Norway
| | - Tom Wilsgaard
- Department of Community Medicine, UiT The Arctic University of Norway, Tromso, Norway
| | - Roy M. Bremnes
- Department of Oncology, University Hospital of North Norway, Tromso, Norway
- Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromso, Norway
| | - Lill-Tove Busund
- Department of Clinical Pathology, University Hospital of North Norway, Tromso, Norway
- Institute of Medical Biology, UiT The Arctic University of Norway, Tromso, Norway
| | - Tom Donnem
- Department of Oncology, University Hospital of North Norway, Tromso, Norway
- Institute of Clinical Medicine, UiT The Arctic University of Norway, Tromso, Norway
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10
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Yan P, Li YH, Tang ZJ, Shu X, Liu X. High monocarboxylate transporter 4 protein expression in stromal cells predicts adverse survival in gastric cancer. Asian Pac J Cancer Prev 2015; 15:8923-9. [PMID: 25374230 DOI: 10.7314/apjcp.2014.15.20.8923] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Increasing evidence suggests that stromal monocarboxylate transporter 4 (MCT4) and carbonic anhydrase IX (CA IX) may play key roles in tumor development. However, their clinical value remains largely unexplored in gastric cancer (GC). The present study aimed to determine clinicopathological significance and prognostic values of stromal MCT4 and CA IX in GC. MATERIALS AND METHODS Specimens from 143 GC patients were immunohistochemically stained using polyclonal anti-MCT4 and anti-CA IX antibodies. Expression was correlated with patient clinicopathologic characteristics and survival data. RESULTS High stromal MCT4 expression was detected in 72 of 143 (50.3%) GCs and high CA IX in 74 (51.7%). Both high stromal MCT4 and CA IX were correlated with advanced TNM stage (p=0.000; p=0.000). High CA IX expression was positively related to depth of invasion (p=0.022) and positive lymph nodes (p=0.002) as well. Survival analysis indicated high expression of stromal MCT4 to be an independent factor in predicting poor overall survival (OS) (HR and 95%CI=1.962, 1.032-3.729, p=0.040) and disease free survival (DFS) (HR and 95%CI=2.081, 1.158-3.741, p=0.014) of GC patients. However, high CA IX expression exhibited no significant predictive value. CONCLUSIONS These findings suggest that high expression of stromal MCT4 and CA IX proteins is significantly correlated with GC progression. High stromal MCT4 heralds worse outcome of GC patient, suggesting a novel candidate prognostic marker and therapeutic target.
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Affiliation(s)
- Ping Yan
- Department of Occupational and Environmental Health, School of Public Health, Wuhan University, Wuhan, PR China E-mail :
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11
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Bertino EM, Williams TM, Nana-Sinkam SP, Shilo K, Chatterjee M, Mo X, Rahmani M, Phillips GS, Villalona-Calero MA, Otterson GA. Stromal Caveolin-1 Is Associated With Response and Survival in a Phase II Trial of nab-Paclitaxel With Carboplatin for Advanced NSCLC Patients. Clin Lung Cancer 2015; 16:466-74. [PMID: 26123189 DOI: 10.1016/j.cllc.2015.05.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 04/28/2015] [Accepted: 05/05/2015] [Indexed: 01/05/2023]
Abstract
UNLABELLED In this phase II trial, carboplatin with nanoparticle albumin-bound (nab)-paclitaxel as first-line therapy for advanced non-small-cell lung cancer (NSCLC) was evaluated. Most patients had squamous cell histology. Tumor-associated stromal caveolin-1 (Cav-1) expression was correlated with improved response rate and survival in NSCLC patients who received nab-paclitaxel in this phase II trial. These results suggest Cav-1 might serve as a potential biomarker in this patient population. BACKGROUND The combination of bevacizumab with platinum-based chemotherapy results in greater response rate (RR) and overall survival (OS) in advanced non-small-cell lung cancer (NSCLC). Bevacizumab is contraindicated in patients with squamous histology or hemoptysis. Nanoparticle albumin-bound (nab)-paclitaxel is a novel formulation of paclitaxel with greater dose tolerance and improved efficacy. We hypothesized that nab-paclitaxel and carboplatin would be superior to alternative doublets in advanced NSCLC patients ineligible for bevacizumab. PATIENTS AND METHODS We conducted a single-arm phase II trial (NCT00729612) with carboplatin and nab-paclitaxel on day 1 of a 21-day cycle to evaluate RR (primary end point), safety, toxicity, and OS. Eligibility included: squamous histology, hemoptysis, or ongoing anticoagulation. Correlative studies included immunohistochemistry for secreted protein acid rich in cysteine (SPARC) and caveolin-1 (Cav-1). RESULTS Sixty-three patients were enrolled. Most patients had squamous cell carcinoma (n = 48); other reasons for eligibility included hemoptysis (n = 11) and anticoagulation (n = 2). Toxicity Grade ≥ 3/4 included neuropathy, cytopenias, and fatigue. RR was 38% (24 partial response/0 complete response); 20 patients had stable disease (32%). Median progression-free survival was 5 months and median OS was 9.7 months. Immunohistochemistry for SPARC and Cav-1 was performed in 38 and 37 patients respectively. Although no association was found for SPARC expression in tumor or stroma with RR or OS, we found that higher Cav-1 levels in tumor-associated stroma was associated with improved RR and OS. CONCLUSION Carboplatin and nab-paclitaxel every 21 days demonstrated promising efficacy with tolerable toxicity in NSCLC patients ineligible for bevacizumab therapy. Further analysis and validation of Cav-1 and SPARC expression in tumor and stromal compartments as prognostic and/or predictive biomarkers of NSCLC or nab-paclitaxel treatment is warranted.
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Affiliation(s)
- Erin M Bertino
- Department of Internal Medicine, Division of Medical Oncology, The Ohio State University, Columbus, OH
| | - Terence M Williams
- Department of Radiation Oncology, The Ohio State University, Columbus, OH
| | - S Patrick Nana-Sinkam
- Department of Internal Medicine, Division of Pulmonology/Critical Care, The Ohio State University, Columbus, OH
| | - Konstantin Shilo
- Department of Pathology, The Ohio State University, Columbus, OH
| | - Moumita Chatterjee
- Department of Radiation Oncology, The Ohio State University, Columbus, OH
| | - Xiaokui Mo
- Comprehensive Cancer Center, The Ohio State University, Columbus, OH
| | - Meliha Rahmani
- Comprehensive Cancer Center, The Ohio State University, Columbus, OH
| | - Gary S Phillips
- Comprehensive Cancer Center, The Ohio State University, Columbus, OH
| | - Miguel A Villalona-Calero
- Department of Internal Medicine, Division of Medical Oncology, The Ohio State University, Columbus, OH
| | - Gregory A Otterson
- Department of Internal Medicine, Division of Medical Oncology, The Ohio State University, Columbus, OH.
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Gupta R, Toufaily C, Annabi B. Caveolin and cavin family members: dual roles in cancer. Biochimie 2014; 107 Pt B:188-202. [PMID: 25241255 DOI: 10.1016/j.biochi.2014.09.010] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 09/04/2014] [Indexed: 12/16/2022]
Abstract
Caveolae are specialized plasma membrane subdomains with distinct lipid and protein compositions, which play an essential role in cell physiology through regulation of trafficking and signaling functions. The structure and functions of caveolae have been shown to require the proteins caveolins. Recently, members of the cavin protein family were found to be required, in concert with caveolins, for the formation and function of caveolae. Caveolins have a paradoxical role in the development of cancer formation. They have been involved in both tumor suppression and oncogenesis, depending on tumor type and progress stage. High expression of caveolins and cavins leads to inhibition of cancer-related pathways, such as growth factor signaling pathways. However, certain cancer cells that express caveolins and cavins have been shown to be more aggressive and metastatic because of their increased potential for anchorage-independent growth. Here, we will survey the functional roles of caveolins and of different cavin family members in cancer regulation.
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Affiliation(s)
- Reshu Gupta
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Département de Chimie, Université du Québec à Montréal, Québec H3C 3P8, Canada.
| | - Chirine Toufaily
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Département de Chimie, Université du Québec à Montréal, Québec H3C 3P8, Canada
| | - Borhane Annabi
- Laboratoire d'Oncologie Moléculaire, Centre de Recherche BioMed, Département de Chimie, Université du Québec à Montréal, Québec H3C 3P8, Canada
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Wang HY, Yang GF, Huang YH, Huang QW, Gao J, Zhao XDA, Huang LM, Chen HL. Reduced expression of autophagy markers correlates with high-risk human papillomavirus infection in human cervical squamous cell carcinoma. Oncol Lett 2014; 8:1492-1498. [PMID: 25202355 PMCID: PMC4156245 DOI: 10.3892/ol.2014.2417] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 07/08/2014] [Indexed: 02/05/2023] Open
Abstract
Infection by an oncogenic human papillomavirus (HPV), in particular HPV16 and 18, is a high risk factor for developing cervical cancer; however, viral infection alone is not sufficient for cancer progression. Autophagy is hypothesized to be an important process during carcinogenesis. The aim of the present study was to investigate the association between autophagy and high-risk HPV (hrHPV) infection in human cervical squamous cell carcinomas (SCCs), and to analyze the clinical significance of this association. Quantum dot (QD)-based immunofluorescence histochemistry was used to detect the expression of autophagy markers, Beclin-1 and microtubule-associated proteins 1A/1B light chain 3B (LC3B) proteins, in 104 cases of cervical cancer (including 80 SCCs and 24 adenocarcinomas) and 20 normal cervical tissues. hrHPV (HPV16/18) infection was detected by QDs based fluorescence in situ hybridization in cervical cancers. The results revealed that the expression levels of Beclin-1 and LC3B were significantly lower in cervical cancer cells when compared with those of normal cervical squamous epithelial cells, and were found to negatively correlate with hrHPV infection. The expression levels of Beclin-1 and LC3B were not associated with age, tumor grade, tumor stage, tumor node metastasis stage or lymph node metastasis. However, a positive correlation was identified between Beclin-1 and LC3B protein expression. In addition, the absence of autophagy in combination with hrHPV infection may accelerate the progression of cervical SCC. In conclusion, decreased expression of Beclin-1 and LC3B may be important in cervical carcinogenesis. The hrHPV-host cell interaction may inhibit autophagy, which may aid virus duplication and infection, as well as cervical cancer development.
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Affiliation(s)
- Hua-Yi Wang
- Department of Pathology, Jingzhou Second People's Hospital, Jingzhou, Hubei 434000, P.R. China
| | - Gui-Fang Yang
- Department of Pathology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Yan-Hua Huang
- Department of Molecular Pathology, Wuhan Nano Tumor Diagnosis Engineering Research Center, Wuhan, Hubei 430075, P.R. China
| | - Qi-Wen Huang
- Department of Pathology, Jingzhou Second People's Hospital, Jingzhou, Hubei 434000, P.R. China
| | - Jun Gao
- Department of Molecular Pathology, Wuhan Nano Tumor Diagnosis Engineering Research Center, Wuhan, Hubei 430075, P.R. China
| | - Xian-DA Zhao
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Li-Ming Huang
- Department of Oncology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Hong-Lei Chen
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan, Hubei 430071, P.R. China
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14
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Chen D, Shen C, Du H, Zhou Y, Che G. Duplex value of caveolin-1 in non-small cell lung cancer: a meta analysis. Fam Cancer 2014; 13:449-57. [DOI: 10.1007/s10689-014-9707-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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15
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Caveolin-1 expression level in cancer associated fibroblasts predicts outcome in gastric cancer. PLoS One 2013; 8:e59102. [PMID: 23527097 PMCID: PMC3602462 DOI: 10.1371/journal.pone.0059102] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 02/11/2013] [Indexed: 12/15/2022] Open
Abstract
Aims Altered expression of epithelial or stromal caveolin-1 (Cav-1) is observed in various types of human cancers. However, the clinical significance of Cav-1 expression in gastric cancer (GC) remains largely unknown. The present study aims to explore the clinicopathological significance and prognostic value of both tumor cells and cancer associated fibroblasts (CAFs) Cav-1 in GC. Methods and Results Quantum dots immunofluorescence histochemistry was performed to examine the expression of Cav-1 in 20 cases of gastritis without intestinal metaplasia (IM), 20 cases of gastritis with IM and 286 cases of GC. Positive rates of epithelial Cav-1 in gastritis without IM, gastritis with IM and GC showed a decreasing trend (P = 0.012). Low expression of Cav-1 in CAFs but not in tumor cells was an independent predictor of poor prognosis in GC patients (P = 0.034 and 0.005 respectively in disease free survival and overall survival). Cav-1 level in tumor cells and CAFs showed no significant correlation with classic clinicopathological features. Conclusions Loss of epithelial Cav-1 may promote malignant progression and low CAFs Cav-1 level herald worse outcome of GC patient, suggesting CAFs Cav-1 may be a candidate therapeutic target and a useful prognostic marker of GC.
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He Y, Zhao X, Gao J, Fan L, Yang G, Cho WCS, Chen H. Quantum dots-based immunofluorescent imaging of stromal fibroblasts Caveolin-1 and light chain 3B expression and identification of their clinical significance in human gastric cancer. Int J Mol Sci 2012. [PMID: 23203033 PMCID: PMC3509549 DOI: 10.3390/ijms131113764] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Caveolin-1 (Cav-1) expression deficiency and autophagy in tumor stromal fibroblasts (hereafter fibroblasts) are involved in tumor proliferation and progression, particularly in breast and prostate cancer. The aim of this study was to detect the expression of fibroblastic Cav-1 and LC3B, markers of autophagy, in gastric cancer (GC) and to analyze their clinical significances. Furthermore, because Epstein-Barr virus (EBV)-associated GC (EBVaGC) is a unique subtype of GC; we compared the differential expression of fibroblastic Cav-1 and LC3B in EBVaGC and non-EBVaGC. Quantum dots (QDs)-based immunofluorescence histochemistry was used to examine the expression of fibroblastic Cav-1 and LC3B in 118 cases of GC with adequate stroma. QDs-based double immunofluorescence labeling was performed to detect the coexpression of Cav-1 and LC3B proteins. EBV-encoded small RNA was detected by QDs-based fluorescence in situ hybridization to identify EBVaGC. Multivariate analysis indicated that low fibroblastic Cav-1 level was an independent prognosticator (p = 0.029) that predicted poorer survival of GC patients. Positive fibroblastic LC3B was correlated with lower invasion (p = 0.032) and was positively associated with Cav-1 expression (r = 0.432, p < 0.001). EBV infection did not affect fibroblastic Cav-1 and LC3B expression. In conclusion, positive fibroblastic LC3B correlates with lower invasion, and low expression of fibroblastic Cav-1 is a novel predictor of poor GC prognosis.
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Affiliation(s)
- Yuyu He
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan 430071, China; E-Mails: (Y.H.); (X.Z.); (L.F.)
| | - Xianda Zhao
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan 430071, China; E-Mails: (Y.H.); (X.Z.); (L.F.)
| | - Jun Gao
- Department of Molecular Pathology, Wuhan Nano Tumor Diagnosis Engineering Research Center, Wuhan 430075, China; E-Mail:
| | - Lifang Fan
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan 430071, China; E-Mails: (Y.H.); (X.Z.); (L.F.)
| | - Guifang Yang
- Department of Pathology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; E-Mail:
| | - William Chi-shing Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, 30 Gascoigne Road, Kowloon, Hong Kong
- Authors to whom correspondence should be addressed; E-Mails: (W.C.C.); (H.C.); Tel.: +86-27-6875-9735 (H.C.); Fax: +86-27-6875-9222 (H.C.)
| | - Honglei Chen
- Department of Pathology, School of Basic Medical Science, Wuhan University, Wuhan 430071, China; E-Mails: (Y.H.); (X.Z.); (L.F.)
- Department of Biochemistry, Rush University Medical Center, 1735 West Harrison Street, Chicago, IL 60612, USA
- Authors to whom correspondence should be addressed; E-Mails: (W.C.C.); (H.C.); Tel.: +86-27-6875-9735 (H.C.); Fax: +86-27-6875-9222 (H.C.)
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Zhang PF, Zeng GQ, Hu R, Li C, Yi H, Li MY, Li XH, Qu JQ, Wan XX, He QY, Li JH, Chen Y, Ye X, Li JY, Wang YY, Feng XP, Xiao ZQ. Identification of flotillin-1 as a novel biomarker for lymph node metastasis and prognosis of lung adenocarcinoma by quantitative plasma membrane proteome analysis. J Proteomics 2012; 77:202-14. [PMID: 22982323 DOI: 10.1016/j.jprot.2012.08.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 08/14/2012] [Accepted: 08/31/2012] [Indexed: 12/18/2022]
Abstract
To identify a novel lung adenocarcinoma (AdC) biomarker, iTRAQ-tagging combined with 2D LC-MS/MS analysis was used to identify differentially expressed plasma membrane (PM) proteins in primary lung AdCs and paraneoplastic normal lung tissues (PNLTs). As a result, 36 differentially expressed membrane proteins were identified. Two differential PM proteins flotillin-1 and caveolin-1 were selectively validated by Western blotting. As there has been no report on the association of flotillin-1 with lung AdC, immunohistochemistry was further performed to detect the expression of flotillin-1 in the archival tissue specimens including 42 cases of PNLTs, 62 cases of primary lung AdCs with lymph node metastasis (LNM AdCs), and 46 cases of primary lung AdCs without lymph node metastasis (non-LNM AdCs), and the correlation of flotillin-1 expression levels in lung AdCs with clinicopathological features and clinical outcomes were evaluated. The results showed that up-regulation of flotillin-1 expression in lung AdCs was significantly correlated with advanced clinical stage, lymph node metastasis, increased postoperative relapse and decreased overall survival. Cox regression analysis revealed that the expressional level of flotillin-1 was an independent prognostic factor. The data suggest that flotillin-1 is a potential novel biomarker for lymph node metastasis and prognosis of lung AdC, and flotillin-1 up-regulation might play an important role in the pathogenesis of lung AdC.
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Affiliation(s)
- Peng-Fei Zhang
- Key Laboratory of Cancer Proteomics of Chinese Ministry of Health, Xiangya Hospital, Central South University, Changsha 410008, China
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Taurin S, Nehoff H, Greish K. Anticancer nanomedicine and tumor vascular permeability; Where is the missing link? J Control Release 2012; 164:265-75. [PMID: 22800576 DOI: 10.1016/j.jconrel.2012.07.013] [Citation(s) in RCA: 222] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 06/29/2012] [Accepted: 07/08/2012] [Indexed: 12/26/2022]
Abstract
Anticancer nanomedicine was coined to describe anticancer delivery systems such as polymer conjugates, liposomes, micelles, and metal nanoparticles. These anticancer delivery platforms have been developed with the enhanced permeability and retention (EPR) effect as a central mechanism for tumor targeting. EPR based nanomedicine has demonstrated, beyond doubt, to selectively target tumor tissues in animal models. However, over the last two decades, only nine anticancer agents utilizing this targeting strategy have been approved for clinical use. In this review, we systematically analyze various aspects that explain the limited clinical progress yet achieved. The influence of nanomedicine physicochemical characteristics, animal tumor models, and variations in tumor biology, on EPR based tumor targeting is closely examined. Furthermore, we reviewed results from over one hundred publications to construct patterns of factors that can influence the transition of EPR based anticancer nanomedicine to the clinic.
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Affiliation(s)
- Sebastien Taurin
- Department of Pharmacology & Toxicology, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
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Du X, Qian X, Papageorge A, Schetter AJ, Vass WC, Liu X, Braverman R, Robles AI, Lowy DR. Functional interaction of tumor suppressor DLC1 and caveolin-1 in cancer cells. Cancer Res 2012; 72:4405-16. [PMID: 22693251 DOI: 10.1158/0008-5472.can-12-0777] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Deleted in liver cancer 1 (DLC1), a tumor suppressor gene frequently inactivated in non-small cell lung cancer (NSCLC) and other malignancies, encodes a multidomain protein with a RhoGTPase-activating (RhoGAP) domain and a StAR-related lipid transfer (START) domain. However, no interacting macromolecule has been mapped to the DLC1 START domain. Caveolin-1 (CAV-1) functions as a tumor suppressor in most contexts and forms a complex with DLC1. Here, we have mapped the region of DLC1 required for interaction with CAV-1 to the DLC1 START domain. Mutation of the DLC1 START domain disrupted the interaction and colocalization with CAV-1. Moreover, DLC1 with a START domain mutation failed to suppress neoplastic growth, although it negatively regulated active Rho. CAV-1 and DLC1 expression levels were correlated in two public datasets of NSCLC lines and in two independent publicly available mRNA expression datasets of NSCLC tumors. Clinically, low DLC1 expression predicted a poor clinical outcome in patients with lung cancer. Together, our findings indicate that complex formation between the DLC1 START domain and CAV-1 contributes to DLC1 tumor suppression via a RhoGAP-independent mechanism, and suggest that DLC1 inactivation probably contributes to cancer progression.
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Affiliation(s)
- Xiaoli Du
- Laboratory of Cellular Oncology, Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
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Current World Literature. Curr Opin Support Palliat Care 2012; 6:109-25. [DOI: 10.1097/spc.0b013e328350f70c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Impaired caveolae function and upregulation of alternative endocytic pathways induced by experimental modulation of intersectin-1s expression in mouse lung endothelium. Biochem Res Int 2012; 2012:672705. [PMID: 22506115 PMCID: PMC3299393 DOI: 10.1155/2012/672705] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 11/16/2011] [Indexed: 11/17/2022] Open
Abstract
Intersectin-1s (ITSN-1s), a protein containing five SH3 (A-E) domains, regulates via the SH3A the function of dynamin-2 (dyn2) at the endocytic site. ITSN-1s expression was modulated in mouse lung endothelium by liposome delivery of either a plasmid cDNA encoding myc-SH3A or a specific siRNA targeting ITSN-1 gene. The lung vasculature of SH3A-transduced and ITSN-1s- deficient mice was perfused with gold albumin (Au-BSA) to analyze by electron microscopy the morphological intermediates and pathways involved in transendothelial transport or with dinitrophenylated (DNP)-BSA to quantify by ELISA its transport. Acute modulation of ITSN-1s expression decreased the number of caveolae, impaired their transport, and opened the interendothelial junctions, while upregulating compensatory nonconventional endocytic/transcytotic structures. Chronic inhibition of ITSN-1s further increased the occurrence of nonconventional intermediates and partially restored the junctional integrity. These findings indicate that ITSN-1s expression is required for caveolae function and efficient transendothelial transport. Moreover, our results demonstrate that ECs are highly adapted to perform their transport function while maintaining lung homeostasis.
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