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<dc:title xml:lang="fr">La protéine apparentée à l'hormone parathyroïdienne (PTHrP) dans la biologie de la cellule mésangiale : rôles dans l'inflammation, la croissance et la survie</dc:title>
<dcterms:alternative xml:lang="en">The parathyroid hormone-related protein (PTHrP) in the biology of the mesangial cell : roles in inflammation, growth and survival</dcterms:alternative>
<dc:subject xml:lang="fr">Cellule mésangiale</dc:subject>
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<dc:subject xml:lang="fr">Prolifération</dc:subject>
<dc:subject xml:lang="fr">Apoptose</dc:subject>
<dc:subject xml:lang="fr">Inflammation</dc:subject>
<dc:subject xml:lang="fr">Intracrine</dc:subject>
<dc:subject xml:lang="fr">Paracrine</dc:subject>
<dc:subject xml:lang="en">Mesangial cells</dc:subject>
<dc:subject xml:lang="en">PTHrP</dc:subject>
<dc:subject xml:lang="en">Prolifération</dc:subject>
<dc:subject xml:lang="en">Apoptosis</dc:subject>
<dc:subject xml:lang="en">Inflammation</dc:subject>
<dc:subject xml:lang="en">Intracrine</dc:subject>
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<tef:elementdEntree autoriteExterne="032294522" autoriteSource="Sudoc">Glomérulonéphrite mésangiale</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La glomérulonéphrite mésangioproliférative (GNMP) se caractérise par une inflammation locale et la prolifération et l’apoptose des cellules mésangiales (CM). La protéine apparentée à l’hormone parathyroïdienne (PTHrP) a été impliquée dans ces processus dans divers types cellulaires. Nous avons analysé les effets de la PTHrP sur ces processus dans les CM. Nous montrons que la PTHrP majore la prolifération des CM par voie intracrine et diminue leur apoptose par voie paracrine. La PTHrP stimule les voies de l’AMPc/PKA et PI3-K/Akt conduisant à l’activation du NFkB et à la majoration de la cyclooxygénase-2 (Cox-2). La Cox-2 était responsable de la survie des CM par la PTHrP. Par ailleurs, l’IL-1beta et le TNF-alpha majorent l’expression de la PTHrP dans les CM, et la PTHrP elle-même induisait l’expression de cytokines et chimiokines. L’expression des cytokines (IL-17, IL-16), était brève (pic à 2h). L’expression des chimiokine (RANTES, MIP-2, TARC et I-TAC) était plus prolongée (4h). Dans un modèle murin de GNMP, la PTHrP était surexprimée à J1 dans les glomérules malades. Elle pourrait contribuer à l’inflammation locale, à la prolifération et à la survie des CM.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Mesangial proliferative glomerulonephritis (MPGN) is characterized by mesangial cells (MC) inflammation, proliferation and apoptosis. The parathyroid hormone-related protein (PTHrP) is known to influence these processes in many cell types. In this work we analyzed the effects of PTHrP on MC proliferation, apoptosis and inflammation. Our results show that PTHrP induced MC proliferation through the intracrine pathway while it promoted their survival through the paracrine one. PTHrP activating its receptor PTH1R, led to the activation of cAMP/PKA and PI3-K/Akt pathways, which induced NF-kappaB, and upregulated the cyclooxygenase-2 (Cox-2). We have shown that the Cox-2 was responsible of the anti-apoptotic effect of PTHrP on MC. Otherwise, IL-1beta and TNF-alpha importantly upregulated the PTHrP in MC and PTHrP itself led to an overexpression of many cytokines and chemokines. The overexpression of cytokines (IL-17 and IL-16) was brief (2h) while that of chemokines was extended (4h). In a mouse model of MPGN, PTHrP was upregulated in the injured glomeruli at day 1. PTHrP may then contribute to the inflammation, the proliferation and the survival of MC.</dcterms:abstract>
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