213 research outputs found

    Activation of mutated TRPA1 ion channel by resveratrol in human prostate cancer associated fibroblasts (CAF)

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    Previous studies showed the effects of resveratrol (RES) on several cancer cells, including prostate cancer (PCa) cell apoptosis without taking into consideration the impact of the tumor microenvironment (TME). The TME is composed of cancer cells, endothelial cells, blood cells and cancer-associated fibroblasts (CAF), the main source of growth factors. The latter cells might modify in the TME the impact of RES on tumor cells via secreted factors. Recent data clearly show the impact of CAF on cancer cells apoptosis resistance via secreted factors. However, the effects of RES on PCa CAF have not been studied so far. We have investigated here for the first time the effects of RES on the physiology of PCa CAF in the context of TME. Using a prostate cancer CAF cell line and primary cultures of CAF from prostate cancers, we show that RES activates the N-terminal mutated Transient Receptor Potential Ankyrin 1 (TRPA1) channel leading to an increase in intracellular calcium concentration and the expression and secretion of growth factors (HGF and VEGF) without inducing apoptosis in these cells. Interestingly, in the present work, we also show that when the prostate cancer cells were co-cultured with CAF, the RES-induced cancer cell apoptosis was reduced by 40%, an apoptosis reduction canceled in the presence of the TRPA1 channel inhibitors. The present work highlights CAF TRPA1 ion channels as a target for RES and the importance of the channel in the epithelial-stromal crosstalk in the TME leading to resistance to the RES-induced apoptosis

    Rapport de mission (Cirad/MAE) CENARGEN, Brésil du 21 au 28 novembre 1998. Appui au projet INCO ananas

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    Dans le cadre du projet INCO ananas financĂ© par l'Union EuropĂ©enne, un volet concernant l'analyse molĂ©culaire de la diversitĂ© gĂ©nĂ©tique de l'ananas a Ă©tĂ© pris en charge par le Cirad-flhor. I1 a semblĂ© nĂ©cessaire d'assurer un appui sur place. Le but de cette prise de contact Ă©tait de faciliter l'intĂ©gration de MF. Duval. L'ABM est un laboratoire de bonne dimension qui a su s'Ă©quiper d'une façon cohĂ©rente. I1 a produit un bon nombre de publications scientifiques de haut niveau. Si, du point de vue de la gĂ©nĂ©tique de l'ananas en gĂ©nĂ©ral, la compĂ©tence et le statut de MF Duval Ă©taient dĂ©jĂ  bien Ă©tablis auprĂšs de ses collĂšgues BrĂ©siliens, cela semblait moins Ă©vident pour la partie liĂ©e Ă  une approche molĂ©culaire. La reconnaissance rĂ©ciproque, lors de cette mission, des similitudes entre les objectifs et les moyens de Programme Biotrop et de 1'ABM, permettra de conforter la place de MF Duval Ă  l'ABM. Les rĂ©sultats pourront ĂȘtre exploitĂ©s aussi bien au BrĂ©sil qu'au Portugal (autre partenaire) ce qui permet d'envisager avec optimisme la globalitĂ© du projet y compris pour le volet cartographie gĂ©nĂ©tique. Ceci permet aussi d'envisager d'autres collaborations entre l'ABM et le Programme Biotro
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