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Academic literature on the topic 'Protéine TRPM4'
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Dissertations / Theses on the topic "Protéine TRPM4"
Aize, Margaux. "Rôle du canal iοnique ΤRΡΜ4 dans la différenciatiοn οstéοgénique des cellules interstitielles de la valve aοrtique humaine." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC411.
Full textTRPM4 is a non-selective cation channel activated by intracellular calcium involved in the remodeling of human cardiac fibroblasts. These cells share properties with the valvular interstitial cells (VIC), the main cells that compose the aortic valves, including their capacity for phenotypic transdifferentiation. Osteogenic differentiation is a key element in valve mineralization leading to calcified aortic stenosis. TRPM4 channel expression is increased in aortic valves from patients with calcified aortic stenosis suggesting that TRPM4 could be involved in the valve’s calcification process. Furthermore, this channel is involved in radiation-induced aortic valve remodeling in mouse. However, the cellular actors and TRPM4-dependant pathways involved in this remodeling remain unknown. The purpose of this study was to search for potential implication of TRPM4 in osteogenic differentiation of human VIC (hVIC) and underlying molecular mechanisms.This work demonstrated that the TRPM4 channel is preferentially expressed at the plasma membrane and a typical electrophysiological signature of TRPM4 was recorded on hVIC. TRPM4 is involved in the osteogenic differentiation of hVIC both in cells originating from calcified valves and in hVIC originating from non-calcified valves. This effect occured through the activation of various signaling pathways, including a TRPM4-dependent activation of the BMP2/SMAD1/5 pathway and the NFAT pathway. Moreover, we were able to observe a stronger expression of the TRPM4 channel in hVIC from calcified valves compared to cells from non-calcified valves. Likewise, the culture of hVIC in a pro-calcifying medium led to an increase in the expression of the channel. Finally, hVIC radiation at a dose of 8 Gy resulted in an increase in cell surface area associated to a cellular senescence which are both TRPM4-dependent.Overall, this work highlights the TRPM4 channel as a new player in the differentiation of hVIC
Vanlaeys, Alison. "Implication du canal TRPM7 dans les mécanismes métastatiques de l'adénocarcinome canalaire pancréatique." Electronic Thesis or Diss., Amiens, 2018. http://www.theses.fr/2018AMIE0018.
Full textPancreatic ductal adenocarcinoma (PDAC) is the most common form of pancreatic cancer. It is characterized by a metastatic and chemoresistant phenotype for which there is no diagnostic marker or effective treatment. It may become the second leading cause of cancer-related death by 2030. There is an urgent need to better understand PDAC progression. Metastatic spread depends on several cellular mechanisms, including the invasion of stroma by cancer cells. We have recently shown that the transmembrane channel TRPM7 (Transient Receptor Potential Melastatin related 7) is overexpressed in PDAC and regulates cell migration. The aim of this work is to evaluate TRPM7 implication in invasion and to highlight the molecular mechanisms in PDAC and non-cancer pancreatic cells. TRPM7 channel regulates basal cell invasion, MMP-2, uPA and Hsp90α secretion in human pancreatic cancer cell lines through constitutive magnesium entry. TRPM7 interacts directly with Hsp90α and it contributes to the phosphorylation of serine residues. Magnesium could participate by activating TRPM7 kinase or by modifying Hsp90α conformation. Moreover, TRPM7 expression in metastatic lymph nodes is correlated to its expressionin primary tumor. In non-cancer cells, TRPM7 is not implicated in basal cell invasion but its overexpression (through plasmid orchronic treatment with cadmium, known as probable carcinogen pollutant) induces invasive phenotype transition. TRPM7 is mainly involved in magnesium homeostasis variation, in cellular morphology modification and mesenchymal transition. In conclusion, our results provide new insights into the key role of TRPM7 in both regulation of basal cell invasion in ACP and initiation of invasive phenotype acquisition in non-cancer epithelial cells
Vanlaeys, Alison. "Implication du canal TRPM7 dans les mécanismes métastatiques de l'adénocarcinome canalaire pancréatique." Thesis, Amiens, 2018. http://www.theses.fr/2018AMIE0018/document.
Full textPancreatic ductal adenocarcinoma (PDAC) is the most common form of pancreatic cancer. It is characterized by a metastatic and chemoresistant phenotype for which there is no diagnostic marker or effective treatment. It may become the second leading cause of cancer-related death by 2030. There is an urgent need to better understand PDAC progression. Metastatic spread depends on several cellular mechanisms, including the invasion of stroma by cancer cells. We have recently shown that the transmembrane channel TRPM7 (Transient Receptor Potential Melastatin related 7) is overexpressed in PDAC and regulates cell migration. The aim of this work is to evaluate TRPM7 implication in invasion and to highlight the molecular mechanisms in PDAC and non-cancer pancreatic cells. TRPM7 channel regulates basal cell invasion, MMP-2, uPA and Hsp90α secretion in human pancreatic cancer cell lines through constitutive magnesium entry. TRPM7 interacts directly with Hsp90α and it contributes to the phosphorylation of serine residues. Magnesium could participate by activating TRPM7 kinase or by modifying Hsp90α conformation. Moreover, TRPM7 expression in metastatic lymph nodes is correlated to its expressionin primary tumor. In non-cancer cells, TRPM7 is not implicated in basal cell invasion but its overexpression (through plasmid orchronic treatment with cadmium, known as probable carcinogen pollutant) induces invasive phenotype transition. TRPM7 is mainly involved in magnesium homeostasis variation, in cellular morphology modification and mesenchymal transition. In conclusion, our results provide new insights into the key role of TRPM7 in both regulation of basal cell invasion in ACP and initiation of invasive phenotype acquisition in non-cancer epithelial cells
Grolez, Guillaume. "Rôle et régulation du canal TRPM8 dans la progression et la dissémination métastatique du cancer de la prostate." Thesis, Lille, 2018. http://www.theses.fr/2018LIL1S110.
Full textSeveral studies in recent decades suggest the importance of TRP channel including TRPM8 in the development and metastatic dissemination of prostate cancer. Nevertheless, the different studies conducted on this channel are contradictory. The aim of my thesis was to study the precise role of TRPM8 in prostate cancer by in vivo studies to study the impact of TRPM8 on tumor growth and metastatic dissemination. In addition, we determined the underlying molecular mechanisms regulating the anti-migratory effect of TRPM8.Due to the use of lipid nanocapsules containing a TRPM8 channel agonist, we have confirmed by in vitro and in vivo studies an inhibitory role of TRPM8 on the migration and invasion capacities of prostatic cancer cells. In addition, we also determined an inhibitory role of TRPM8 on tumor growth through the use of orthotopic grafts in murine prostates. We also determined the regulatory mechanisms of cell migration by TRPM8 channel and its partner proteins. In this context, we defined and determined a regulation of the TRPM8 channel by androgens modulating cell migration. Moreover, we determined also the mechanisms underlying the inhibition of TRPM8-induced cell migration involving the small Rap1 GTPase.All of my results demonstrate an anti-proliferative and anti-migratory role of the TRPM8 channel on prostatic cancer cells, suggesting a protective action of this channel in the dissemination of prostatic metastases
Lefebvre, Thibaut. "Rôle du canal TRPM7 dans la prolifération des cellules stellaires pancréatiques humaines activées." Electronic Thesis or Diss., Amiens, 2019. http://www.theses.fr/2019AMIE0057.
Full textPancreatic Ductal Adenocarcinoma (PDAC) is one of the deadliest cancers with a 5 years survival rate under 5%. PDAC development and aggressivness involve pancreatic stellate cells (PSC) activation occurring during desmoplasia. PSC activation induces α-SMA expression, increases proliferative capacities of the CSP, and leads to cancer growth and metastasis. Ion channels are involved in many cellular mechanisms including cell migration, invasion and proliferation. We previously described the role of TRPM7 in PDAC cell invasion and migration (Rybarczyk et al. 2012 and 2017) but its role in PSC remains unknown. Here we show that TRPM7 is involved in magnesium homeostasis and PSC cell proliferation throughPI3K/AKT pathway activation by magnesium. TRPM7 mediated magnesium entry inducing PI3K/AKT pathway activation and leading to P53 and GSK3 inhibition, and CDK2 and PCNA upregulation inducing G1 to S transition. Our results show that TRPM7 is also involved in α-SMA expression by regulating ERK activation in a magnesium dependent manner. PSC activation also regulates TRPM7 expression. Taking together our results show TRPM7 as a potential biomarker for CSP activation and proliferation in PDAC
Bavencoffe, Alexis. "Étude des mécanismes de modulation du canal cationique TRPM8 : implication dans la physiopathologie sensorielle et prostatique." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10154/document.
Full textTRPM8 is known as a cold receptor expressed in the subset of dorsal root ganglion (DRG) and trigeminal (TG) sensory neurons which are activated by cooling temperatures (<28°C) or by chemical imitators of cooling sensation (menthol, icilin and eucalyptol). While screening for a new marker of prostate carcinoma, Larisa Tsavaler et al. detected TRPM8 channel expression in normal and cancer prostate epithelial cells. Expression of trpm8 gene is androgeno-dependent and change during cancer development. Even though many studies investigated the role of TRPM8 as a cold receptor and described its activation mechanisms, at the beginning of this work no research team had published any information about TRPM8 physiological modulators other than cold, be it in prostate or sensory neurons. Since several works reported modifications of thermosensation during physiological situations such as stress, hormonal therapy, age and gender, we investigated a possible regulation of the cold receptor by neuromodulators, hormones and their signalization pathways. Our results demonstrate three new regulatory mechanisms for TRPM8 involving respectively a new non genomic androgenic, a muscarinic or an alpha2A adrenergic receptors pathway.Our data are confirmed in two physiological models, epithelial prostate cells and dorsal root ganglia neurons. This work leads us to propose a possible explanation for variations which could be accounted for during stress, gender, as well as inter- and intra-individual disparity in thermosensation. Finally, our results could help establishing new therapeutic strategies for pathologies involving TRPM8 such as cold allodynia and prostate cancer