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Suarez-Carmona M, Bourcy M, Lesage J, Leroi N, Syne L, Blacher S, Hubert P, Erpicum C, Foidart JM, Delvenne P, Birembaut P, Noël A, Polette M, Gilles C. Soluble factors regulated by epithelial-mesenchymal transition mediate tumour angiogenesis and myeloid cell recruitment. J Pathol 2015; 236:491-504. [PMID: 25880038 DOI: 10.1002/path.4546] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/18/2015] [Accepted: 04/13/2015] [Indexed: 01/13/2023]
Abstract
Epithelial-mesenchymal transition (EMT) programmes provide cancer cells with invasive and survival capacities that might favour metastatic dissemination. Whilst signalling cascades triggering EMT have been extensively studied, the impact of EMT on the crosstalk between tumour cells and the tumour microenvironment remains elusive. We aimed to identify EMT-regulated soluble factors that facilitate the recruitment of host cells in the tumour. Our findings indicate that EMT phenotypes relate to the induction of a panel of secreted mediators, namely IL-8, IL-6, sICAM-1, PAI-1 and GM-CSF, and implicate the EMT-transcription factor Snail as a regulator of this process. We further show that EMT-derived soluble factors are pro-angiogenic in vivo (in the mouse ear sponge assay), ex vivo (in the rat aortic ring assay) and in vitro (in a chemotaxis assay). Additionally, conditioned medium from EMT-positive cells stimulates the recruitment of myeloid cells. In a bank of 40 triple-negative breast cancers, tumours presenting features of EMT were significantly more angiogenic and infiltrated by a higher quantity of myeloid cells compared to tumours with little or no EMT. Taken together, our results show that EMT programmes trigger the expression of soluble mediators in cancer cells that stimulate angiogenesis and recruit myeloid cells in vivo, which might in turn favour cancer spread.
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Gohy ST, Hupin C, Fregimilicka C, Detry BR, Bouzin C, Gaide Chevronay H, Lecocq M, Weynand B, Ladjemi MZ, Pierreux CE, Birembaut P, Polette M, Pilette C. Imprinting of the COPD airway epithelium for dedifferentiation and mesenchymal transition. Eur Respir J 2015; 45:1258-72. [DOI: 10.1183/09031936.00135814] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 10/24/2014] [Indexed: 02/03/2023]
Abstract
In chronic obstructive pulmonary disease (COPD), epithelial changes and subepithelial fibrosis are salient features in conducting airways. Epithelial-to-mesenchymal transition (EMT) has been recently suggested in COPD, but the mechanisms and relationship to peribronchial fibrosis remain unclear. We hypothesised that de-differentiation of the COPD respiratory epithelium through EMT could participate in airway fibrosis and thereby, in airway obstruction.Surgical lung tissue and primary broncho-epithelial cultures (in air–liquid interface (ALI)) from 104 patients were assessed for EMT markers. Cell cultures were also assayed for mesenchymal features and for the role of transforming growth factor (TGF)-β1.The bronchial epithelium from COPD patients showed increased vimentin and decreased ZO-1 and E-cadherin expression. Increased vimentin expression correlated with basement membrane thickening and airflow limitation. ALI broncho-epithelial cells from COPD patients also displayed EMT phenotype in up to 2 weeks of culture, were more spindle shaped and released more fibronectin. Targeting TGF-β1 during ALI differentiation prevented vimentin induction and fibronectin release.In COPD, the airway epithelium displays features of de-differentiation towards mesenchymal cells, which correlate with peribronchial fibrosis and airflow limitation, and which are partly due to a TGF-β1-driven epithelial reprogramming.
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Medjber K, Freidja ML, Grelet S, Lorenzato M, Maouche K, Nawrocki-Raby B, Birembaut P, Polette M, Tournier JM. Role of nicotinic acetylcholine receptors in cell proliferation and tumour invasion in broncho-pulmonary carcinomas. Lung Cancer 2015; 87:258-64. [DOI: 10.1016/j.lungcan.2015.01.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 12/19/2014] [Accepted: 01/02/2015] [Indexed: 11/29/2022]
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Lesage J, Grelet S, Nawrocki-Raby B, Birembaut P, Gilles C, Polette M. Régulation de l’interleukine-8 par les ZOs : un mécanisme dépendant de NF-κB. Rev Mal Respir 2015. [DOI: 10.1016/j.rmr.2015.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Vuiblet V, Nguyen TT, Wynckel A, Fere M, Van-Gulick L, Untereiner V, Birembaut P, Rieu P, Piot O. Contribution of Raman spectroscopy in nephrology: a candidate technique to detect hydroxyethyl starch of third generation in osmotic renal lesions. Analyst 2015; 140:7382-90. [DOI: 10.1039/c5an00821b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Raman spectroscopy, a candidate tool for detection of HES, a volume expander administrated after hemodynamic instability, in the kidney.
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Perotin JM, Adam D, Vella-Boucaud J, Delepine G, Sandu S, Jonvel AC, Prevost A, Berthiot G, Pison C, Lebargy F, Birembaut P, Coraux C, Deslee G. Delay of airway epithelial wound repair in COPD is associated with airflow obstruction severity. Respir Res 2014; 15:151. [PMID: 25427655 PMCID: PMC4251925 DOI: 10.1186/s12931-014-0151-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 11/11/2014] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Airway epithelium integrity is essential to maintain its role of mechanical and functional barrier. Recurrent epithelial injuries require a complex mechanism of repair to restore its integrity. In chronic obstructive pulmonary disease (COPD), an abnormal airway epithelial repair may participate in airway remodeling. The objective was to determine if airway epithelial wound repair of airway epithelium is abnormal in COPD. METHODS Patients scheduled for lung resection were prospectively recruited. Demographic, clinical data and pulmonary function tests results were recorded. Emphysema was visually scored and histological remodeling features were noted. Primary bronchial epithelial cells (BEC) were extracted and cultured for wound closure assay. We determined the mean speed of wound closure (MSWC) and cell proliferation index, matrix metalloprotease (MMP)-2, MMP-9 and cytokines levels in supernatants of BEC 18 hours after cell wounding. In a subset of patients, bronchiolar epithelial cells were also cultured for wound closure assay for MSWC analyze. RESULTS 13 COPD and 7 non COPD patients were included. The severity of airflow obstruction and the severity of emphysema were associated with a lower MSWC in BEC (p = 0.01, 95% CI [0.15-0.80]; p = 0.04, 95% CI [-0.77;-0.03] respectively). Cell proliferation index was decreased in COPD patients (19 ± 6% in COPD vs 27 ± 3% in non COPD, p = 0.04). The severity of COPD was associated with a lower level of MMP-2 (7.8 ± 2 10(5) AU in COPD GOLD D vs 12.8 ± 0.13 10(5) AU in COPD GOLD A, p = 0.04) and a lower level of IL-4 (p = 0.03, 95% CI [0.09;0.87]). Moreover, higher levels of IL-4 and IL-2 were associated with a higher MSWC (p = 0.01, 95% CI [0.17;0.89] and p = 0.02, 95% CI [0.09;0.87] respectively). Clinical characteristics and smoking history were not associated with MSWC, cell proliferation index or MMP and cytokines levels. Finally, we showed an association of the MSWC of bronchial and corresponding bronchiolar epithelial cells obtained from the same patients (p = 0.02, 95% CI [0.12;0.89]). CONCLUSION Our results showed an abnormal bronchial epithelial wound closure process in severe COPD. Further studies are needed to elucidate the contribution and the regulation of this mechanism in the complex pathophysiology of COPD.
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Joannes A, Grelet S, Duca L, Gilles C, Kileztky C, Dalstein V, Birembaut P, Polette M, Nawrocki-Raby B. Fhit Regulates EMT Targets through an EGFR/Src/ERK/Slug Signaling Axis in Human Bronchial Cells. Mol Cancer Res 2014; 12:775-83. [DOI: 10.1158/1541-7786.mcr-13-0386-t] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Adam D, Perotin JM, Lebargy F, Birembaut P, Deslée G, Coraux C. [Regeneration of airway epithelium]. Rev Mal Respir 2013; 31:300-11. [PMID: 24750950 DOI: 10.1016/j.rmr.2013.11.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 10/04/2013] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Epithelial regeneration is a complex process. It can lead to the remodeling of the airway epithelium as in asthma, COPD or cystic fibrosis. BACKGROUND The development of in vivo and in vitro models has allowed the analysis of remodeling mechanisms and showed the role of components of extracellular matrix, proteases, cytokines and growth factors. Airway epithelial progenitors and stems cells have been studied in these models. However, their identification remains difficult. CONCLUSION Identification and characterization of airway epithelial progenitor/stem-cells, and a better knowledge of the regeneration process may allow the development of new therapeutic strategies for airway epithelial reconstitution.
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Guyot-Colosio C, Vuiblet V, Barbe C, Toupance O, Lavaud S, Touré F, Birembaut P, Rieu P. Influence de l’expression du VEGF glomérulaire en transplantation rénale. Nephrol Ther 2013. [DOI: 10.1016/j.nephro.2013.07.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Vuiblet V, Feré M, Wynckel A, Bankole E, Birembaut P, Piot O, Rieu P. Accumulation et persistance d’hydroxyéthyl amidon 130/0,4 dans les greffons rénaux détectées par microspectroscopie Raman. Nephrol Ther 2013. [DOI: 10.1016/j.nephro.2013.07.141] [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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Bessaci-Kabouya K, Gaultier B, Zahm JM, Coraux C, Mauran P, Weiss L, Dalphin ML, Derelle J, Tatopoulos A, Huet F, Perez-Martin S, Birembaut P, Abely M. 116 Effect of Staphylococcus aureus supernatant on airway epithelium functionality in infants with cystic fibrosis. J Cyst Fibros 2013. [DOI: 10.1016/s1569-1993(13)60258-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Luczka E, Syne L, Nawrocki-Raby B, Kileztky C, Hunziker W, Birembaut P, Gilles C, Polette M. Regulation of membrane-type 1 matrix metalloproteinase expression by zonula occludens-2 in human lung cancer cells. Clin Exp Metastasis 2013; 30:833-43. [PMID: 23605953 DOI: 10.1007/s10585-013-9583-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 04/08/2013] [Indexed: 01/11/2023]
Abstract
During tumor invasion, tumor epithelial cells acquire migratory and invasive properties involving important phenotypic alterations. Among these changes, one can observe reorganization or a loss of cell-cell adhesion complexes such as tight junctions (TJs). TJs are composed of transmembrane proteins (occludin, claudins) linked to the actin cytoskeleton through cytoplasmic adaptor molecules including those of the zonula occludens family (ZO-1, -2, -3). We here evaluated the potential role of ZO-2 in the acquisition of invasive properties by tumor cells. In vivo, we showed a decrease of ZO-2 expression in bronchopulmonary cancers, with a preferential localization in the cytoplasm. In addition, in vitro, the localization of ZO-2 varied according to invasive properties of tumor cells, with a cytoplasmic localization correlating with invasion. In addition, we demonstrated that ZO-2 inhibition increases invasive and migrative capacities of invasive tumor cells. This was associated with an increase of MT1-MMP. These results suggest that ZO-2, besides its structural role in tight junction assembly, can act also as a repressor of tumor progression through its ability to reduce the expression of tumor-promoting genes in invasive tumor cells.
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Dauphin M, Barbe C, Lemaire S, Nawrocki-Raby B, Lagonotte E, Delepine G, Birembaut P, Gilles C, Polette M. Vimentin expression predicts the occurrence of metastases in non small cell lung carcinomas. Lung Cancer 2013; 81:117-22. [PMID: 23562674 DOI: 10.1016/j.lungcan.2013.03.011] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 03/04/2013] [Accepted: 03/09/2013] [Indexed: 10/27/2022]
Abstract
Epithelial-to-mesenchymal transition (EMT) is believed to contribute to tumour invasion. Vimentin expression by carcinoma cells is a largely recognized marker of EMT. This study aimed at examining vimentin expression in non small cell lung carcinomas (NSCLC) by immunohistochemistry to evaluate potential correlations between vimentin expression and the differentiation status, the TNM stage and the outcome of the patients. 295 NSCLC including 164 squamous cell carcinomas (SCC), 108 adenocarcinomas (AC) and 23 other NSCLC carcinomas have been examined by immunohistochemistry. Vimentin was indeed detected in 145 cases (49.2%). It was principally present in isolated tumour cells and invasive clusters, particularly in cells at the tumour/stroma interface. Vimentin expression was significantly more expressed in large cell neuroendocrine, adeno-squamous and sarcomatoid carcinomas than in SCC and AC and was significantly associated with the differentiation status of carcinomas. The follow-up of 193 patients further demonstrated that an extensive expression of vimentin (>50% of tumour cells) was associated with the occurrence of metastases. In conclusion, our data demonstrate that vimentin expression is a frequent event in NSCLC and that its expression can be associated with a lack of differentiation and the occurrence of metastases.
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Dauphin M, Barbe C, Lemaire S, Lagonotte E, Delepine G, Birembaut P, Gilles C, Polette M. Rôle pronostique de la vimentine comme marqueur de transition épithélio-mésenchymateuse dans les carcinomes non à petites cellules du poumon. Ann Pathol 2012. [DOI: 10.1016/j.annpat.2012.09.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Adam D, Roux J, Lingée S, Nawrocki-Raby B, Birembaut P, Coraux C. WS2.5 Airway epithelial regeneration is abnormal in CF in absence of endogenous infection and inflammation. J Cyst Fibros 2012. [DOI: 10.1016/s1569-1993(12)60014-9] [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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Joannes A, Birembaut P, Nawrocki-Raby B. Implication du gène Fhit dans la régulation de l’invasion tumorale. Rev Mal Respir 2012. [DOI: 10.1016/j.rmr.2011.10.966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Rotondo S, Menard J, Durlach A, Birembaut P, Staerman F. Endothéline-1 et récepteur A : valeur pronostique pour la reprise évolutive biologique dans l’adénocarcinome de prostate localement avancé et métastatique ganglionnaire. Prog Urol 2012; 22:38-44. [DOI: 10.1016/j.purol.2011.08.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Revised: 08/21/2011] [Accepted: 08/23/2011] [Indexed: 10/17/2022]
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Bonnomet A, Syne L, Brysse A, Feyereisen E, Thompson EW, Noël A, Foidart JM, Birembaut P, Polette M, Gilles C. A dynamic in vivo model of epithelial-to-mesenchymal transitions in circulating tumor cells and metastases of breast cancer. Oncogene 2011; 31:3741-53. [PMID: 22120722 DOI: 10.1038/onc.2011.540] [Citation(s) in RCA: 145] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Epithelial-to-mesenchymal transition (EMT) processes endow epithelial cells with enhanced migratory/invasive properties and are therefore likely to contribute to tumor invasion and metastatic spread. Because of the difficulty in following EMT processes in human tumors, we have developed and characterized an animal model with transplantable human breast tumor cells (MDA-MB-468) uniquely showing spontaneous EMT events to occur. Using vimentin as a marker of EMT, heterogeneity was revealed in the primary MDA-MB-468 xenografts with vimentin-negative and vimentin-positive areas, as also observed on clinical human invasive breast tumor specimens. Reverse transcriptase-PCR after microdissection of these populations from the xenografts revealed EMT traits in the vimentin-positive zones characterized by enhanced 'mesenchymal gene' expression (Snail, Slug and fibroblast-specific protein-1) and diminished expression of epithelial molecules (E-cadherin, ZO-3 and JAM-A). Circulating tumor cells (CTCs) were detected in the blood as soon as 8 days after s.c. injection, and lung metastases developed in all animals injected as examined by in vivo imaging analyses and histology. High levels of vimentin RNA were detected in CTCs by reverse transcriptase-quantitative PCR as well as, to a lesser extent, Snail and Slug RNA. Von Willebrand Factor/vimentin double immunostainings further showed that tumor cells in vascular tumoral emboli all expressed vimentin. Tumoral emboli in the lungs also expressed vimentin whereas macrometastases displayed heterogenous vimentin expression, as seen in the primary xenografts. In conclusion, our data uniquely demonstrate in an in vivo context that EMT occurs in the primary tumors, and associates with an enhanced ability to intravasate and generate CTCs. They further suggest that mesenchymal-to-epithelial phenomena occur in secondary organs, facilitating the metastatic growth.
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Brysse A, Mestdagt M, Polette M, Luczka E, Hunziker W, Noël A, Birembaut P, Foidart JM, Gilles C. Regulation of CXCL8/IL-8 Expression by Zonula Occludens-1 in Human Breast Cancer Cells. Mol Cancer Res 2011; 10:121-32. [DOI: 10.1158/1541-7786.mcr-11-0180] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Marcet B, Chevalier B, Luxardi G, Coraux C, Zaragosi LE, Cibois M, Robbe-Sermesant K, Jolly T, Cardinaud B, Moreilhon C, Giovannini-Chami L, Nawrocki-Raby B, Birembaut P, Waldmann R, Kodjabachian L, Barbry P. Erratum: Control of vertebrate multiciliogenesis by miR-449 through direct repression of the Delta/Notch pathway. Nat Cell Biol 2011. [DOI: 10.1038/ncb2358] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zahm JM, Milliot M, Bresin A, Coraux C, Birembaut P. The effect of hyaluronan on airway mucus transport and airway epithelial barrier integrity: potential application to the cytoprotection of airway tissue. Matrix Biol 2011; 30:389-95. [PMID: 21839834 DOI: 10.1016/j.matbio.2011.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 07/27/2011] [Accepted: 07/27/2011] [Indexed: 10/17/2022]
Abstract
The lubricating abilities and the protective functions of hyaluronan, a structural component of interstitial and connective tissues, were assessed in in vitro models of airway mucus transport and epithelial barrier. We found that hyaluronan enhanced the transport of airway mucus by cilia and by cough: the lower the hyaluronan molecular weight, the higher the increase. By immunofluorescence and western blot, we observed a significant dose-dependent (0.1, 1, 5 and 10 mg/ml) increase by low molecular weight hyaluronan (40 kDa) in the expression of tight junction proteins such as ZO-1, as well as an increase in the trans-epithelial resistance. Incubation of airway epithelial cells with hyaluronan 40 kDa also significantly increased the gap junction functionality. Finally, we demonstrated that hyaluronan 40 kDa protects the airway epithelium against injury induced by bacterial products during infection. These results demonstrate that the expression and functionality of intercellular adhesion molecules are increased by hyaluronan which can also act as a lubricant at the airway epithelium surface and suggest that hyaluronan may play a therapeutic role in a variety of respiratory diseases.
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Vuiblet V, Birembaut P, François A, Cordonnier C, Noel LH, Goujon JM, Paraf F, Machet MC, Girardot-Seguin S, Lebranchu Y, Rieu P. Sirolimus-based regimen is associated with decreased expression of glomerular vascular endothelial growth factor. Nephrol Dial Transplant 2011; 27:411-6. [PMID: 21617191 DOI: 10.1093/ndt/gfr261] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND Sirolimus (SRL) is a potent immunosuppressant used in organ transplantation. It is known to decrease vascular endothelial growth factor (VEGF) synthesis, making it an interesting treatment option for transplant patients who develop Kaposi sarcoma or other malignant diseases. Because VEGF plays a key role in glomerular function and vascular remodelling, we determined the effect of SRL on renal VEGF expression. METHODS Using immunohistochemistry and quantitative image analysis, we examined renal VEGF expression in routine kidney biopsies performed at 1 year post-transplant in the CONCEPT study, a prospective randomized study comparing a cyclosporine (CsA)-based regimen to a SRL-based regimen in association with mycophenolate mofetil (MMF). RESULTS A total of 74 patients were included in this substudy; 35 were randomized to the CsA group and 39 to the SRL group. Using continuous variables, the mean percentage of glomerular VEGF expression at Week 52 was significantly lower in the SRL group (14.7 ± 13%) compared to CsA group (21.2 ± 14%: P = 0.02). The percentage of glomerular VEGF expression at Week 52 was not influenced by recipient or donor age, gender, renal function, CsA dose, CsA blood level, SRL dose or SRL blood level. It was significantly lower in patients with a proteinuria over versus below 0.5 g/day (11.58 ± 7.9 versus 19.45 ± 15.53; P = 0.036). CONCLUSIONS There is emerging evidence that the VEGF system can play either a beneficial or a detrimental role depending on the specific pathologic situations. Therefore, modulating the renal VEGF axis by using an SRL-based regimen may influence the evolution of kidney injury associated with renal transplantation.
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Lacau Saint Guily J, Pretet J, Agius G, Rousseau A, Barry B, Dufour X, Perie S, Lefevre M, Birembaut P, Mougin C, Simon T, Clavel C. PAPILLOPHAR: Impact of the human papillomavirus (HPV) status in the prognosis of oropharynx squamous cell carcinoma (OSCC). J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.tps198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Krais AM, Hautefeuille AH, Cros MP, Krutovskikh V, Tournier JM, Birembaut P, Thépot A, Paliwal A, Herceg Z, Boffetta P, Brennan P, Hainaut PL. CHRNA5 as negative regulator of nicotine signaling in normal and cancer bronchial cells: effects on motility, migration and p63 expression. Carcinogenesis 2011; 32:1388-95. [PMID: 21586512 DOI: 10.1093/carcin/bgr090] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Genome-wide association studies have linked lung cancer risk with a region of chromosome 15q25.1 containing CHRNA3, CHRNA5 and CHRNB4 encoding α3, α5 and β4 subunits of nicotinic acetylcholine receptors (nAChR), respectively. One of the strongest associations was observed for a non-silent single-nucleotide polymorphism at codon 398 in CHRNA5. Here, we have used pharmacological (antagonists) or genetic (RNA interference) interventions to modulate the activity of CHRNA5 in non-transformed bronchial cells and in lung cancer cell lines. In both cell types, silencing CHRNA5 or inhibiting receptors containing nAChR α5 with α-conotoxin MII exerted a nicotine-like effect, with increased motility and invasiveness in vitro and increasing calcium influx. The effects on motility were enhanced by addition of nicotine but blocked by inhibiting CHRNA7, which encodes the homopentameric receptor α7 subunit. Silencing CHRNA5 also decreased the expression of cell adhesion molecules P120 and ZO-1 in lung cancer cells as well as the expression of DeltaNp63α in squamous cell carcinoma cell lines. These results demonstrate a role for CHRNA5 in modulating adhesion and motility in bronchial cells, as well as in regulating p63, a potential oncogene in squamous cell carcinoma.
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Ghoneim C, Kaoma T, Nicot N, François B, Nazarov P, Muller A, Birembaut P, Vallar L. Abstract 3905: Identification of new tumor-specific splice variants in NSCL cancers by whole genome exon arrays. Cancer Res 2011. [DOI: 10.1158/1538-7445.am2011-3905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Although lung cancer is one of the major causes of cancer death in men and women worldwide, the molecular pathogenesis of this disease remains elusive. The contribution of alternative splicing (AS) to cancer pathogenesis and progression is emerging as an area of considerable interest. Cancer-specific splice variants seem to play a key role in disease mechanism and etiology.
In this study, we analyzed 20 matched pairs of tumor specimens of Adenocarcinomas (AC), Squamous Cell Carcinomas (SCC) and adjacent normal tissue using Affymetrix GeneChip Exon microarrays. With this technology, it is possible to profile simultaneously gene expression and alternative splicing patterns for the entire genome using a single array. At the exon level, multiple probes for each exon enable the discrimination among different isoforms of a gene. Total RNA from tumors or normal tissue samples were amplified using the Ambion whole transcript expression kit and were hybridized onto GeneChip Human Exon 1.0 ST Array®. Data generated were normalized using RMA and were subjected to several layers of filtering (DABG filter, Multiple mRNAs filter). The delta splice index (ΔSI) was calculated, and alternative splicing events were detected using MIDAS and Rank Product method. Probesets were ranked based on their SI p-values.
By comparing tumor samples to the corresponding normal subgroups, we generated a list of 1689 splice variant candidates for SCC and 1010 for AC showing significant differential expression between normal and tumor tissues. Top candidates in each tumor subtype were selected based on their ΔSI for manual inspection and further bioinformatics analysis. Study of alternatively spliced candidates revealed that approximately 30 % of the genes were detected in both types of cancer. Gene function analysis combining text mining and knowledge-based approaches indicated that the largest subset (70 %) of these genes was related to cancer. Within this group, 30% of genes were related to lung cancers. Interestingly the major part (85%) of variant candidates was not previously associated with AS events in cancer. We focused our attention on this latter group and, through validation by RT/PCR, confirmed the existence of new specific alternative splicing events occurring in each cancer type. In addition, we identified biological pathways and gene networks that are specifically altered in AC or SCC. The cancer-specific AS variants and pathways identified in our study are promising biomarkers and targets for diagnostic or therapeutic purposes.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 3905. doi:10.1158/1538-7445.AM2011-3905
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