14 research outputs found
Effets et mecanismes d'action de trois types d'antihormones ovariennes dans le cancer du sein humain en culture
SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
Acides gras alimentaires et cancers: mécanismes d'action cellulaire et moléculaire
National audienc
Cloning and regulation of a mRNA specifically expressed in the preadipose state.
International audienceA cDNA library of Ob1771 preadipocytes was constructed, and a cDNA clone designated pOb24 was isolated by differential screening. The pOb24 mRNA, 6 kilobases in length, rose sharply in early differentiating Ob1771 and 3T3-F442A cells and decreased thereafter. In mouse adipose tissue, it was present at a high level in stromal-vascular cells (containing adipose precursor cells) and at a low level in mature adipocytes. Thus, pOb24 mRNA appears to be both in vitro and in vivo an unique marker of the preadipose state, i.e. of cell commitment during adipose cell differentiation. In contrast to glycerol-3-phosphate dehydrogenase mRNA, the emergence of pOb24 mRNA in Ob1771 cells required neither growth hormone or triiodothyronine as obligatory hormones nor insulin as a modulating hormone. Comparative studies of the expression of pOb24 and dihydrofolate reductase genes during the cell cycle suggest that arrest at the G1/S boundary was critical for the entry into the preadipose state. Tumor necrosis factor and transforming growth factor-beta were able to induce a large decrease of pOb24 mRNA level in growth-arrested Ob1771 cells. This decrease was shown to be only confined to early differentiating, glycerol-3-phosphate dehydrogenase negative cells as no decrease of pOb24 mRNA level was observed in glycerol-3-phosphate dehydrogenase positive cells. This result suggests that signals generated by tumor necrosis factor and transforming growth factor-beta have no effect on a commitment-related gene in late differentiated cells
Cloning and regulation of a mRNA specifically expressed in the preadipose state.
International audienceA cDNA library of Ob1771 preadipocytes was constructed, and a cDNA clone designated pOb24 was isolated by differential screening. The pOb24 mRNA, 6 kilobases in length, rose sharply in early differentiating Ob1771 and 3T3-F442A cells and decreased thereafter. In mouse adipose tissue, it was present at a high level in stromal-vascular cells (containing adipose precursor cells) and at a low level in mature adipocytes. Thus, pOb24 mRNA appears to be both in vitro and in vivo an unique marker of the preadipose state, i.e. of cell commitment during adipose cell differentiation. In contrast to glycerol-3-phosphate dehydrogenase mRNA, the emergence of pOb24 mRNA in Ob1771 cells required neither growth hormone or triiodothyronine as obligatory hormones nor insulin as a modulating hormone. Comparative studies of the expression of pOb24 and dihydrofolate reductase genes during the cell cycle suggest that arrest at the G1/S boundary was critical for the entry into the preadipose state. Tumor necrosis factor and transforming growth factor-beta were able to induce a large decrease of pOb24 mRNA level in growth-arrested Ob1771 cells. This decrease was shown to be only confined to early differentiating, glycerol-3-phosphate dehydrogenase negative cells as no decrease of pOb24 mRNA level was observed in glycerol-3-phosphate dehydrogenase positive cells. This result suggests that signals generated by tumor necrosis factor and transforming growth factor-beta have no effect on a commitment-related gene in late differentiated cells
Cloning and regulation of a mRNA specifically expressed in the preadipose state.
International audienceA cDNA library of Ob1771 preadipocytes was constructed, and a cDNA clone designated pOb24 was isolated by differential screening. The pOb24 mRNA, 6 kilobases in length, rose sharply in early differentiating Ob1771 and 3T3-F442A cells and decreased thereafter. In mouse adipose tissue, it was present at a high level in stromal-vascular cells (containing adipose precursor cells) and at a low level in mature adipocytes. Thus, pOb24 mRNA appears to be both in vitro and in vivo an unique marker of the preadipose state, i.e. of cell commitment during adipose cell differentiation. In contrast to glycerol-3-phosphate dehydrogenase mRNA, the emergence of pOb24 mRNA in Ob1771 cells required neither growth hormone or triiodothyronine as obligatory hormones nor insulin as a modulating hormone. Comparative studies of the expression of pOb24 and dihydrofolate reductase genes during the cell cycle suggest that arrest at the G1/S boundary was critical for the entry into the preadipose state. Tumor necrosis factor and transforming growth factor-beta were able to induce a large decrease of pOb24 mRNA level in growth-arrested Ob1771 cells. This decrease was shown to be only confined to early differentiating, glycerol-3-phosphate dehydrogenase negative cells as no decrease of pOb24 mRNA level was observed in glycerol-3-phosphate dehydrogenase positive cells. This result suggests that signals generated by tumor necrosis factor and transforming growth factor-beta have no effect on a commitment-related gene in late differentiated cells
SystĂšme dâinformation nutritionnelle en face avant des emballages : Nutri-Score. Etude de cas ASIRPA
LâInra, en partenariat avec lâuniversitĂ© Paris-XIII (UniversitĂ© Sorbonne Paris Nord), lâInserm, le Cnam et Grenoble INP, a contribuĂ© Ă dĂ©velopper un Ă©tiquetage nutritionnel Ă cinq couleurs, le Nutri-Score, dont lâobjectif est dâinciter les Français Ă limiter leur consommation de produits riches en gras, en sel, en sucre et en calories, pour lutter contre la progression de lâobĂ©sitĂ© et des maladies chroniques. Au terme dâun dĂ©bat public animĂ©, dâune Ă©tude grandeur nature testant quatre systĂšmes dâinformation, et de travaux de recherche qui ont constituĂ© progressivement un dossier scientifique permettant de soutenir la dĂ©cision politique, un arrĂȘtĂ© interministĂ©riel a reconnu en octobre 2017 le Nutri-Score comme le systĂšme dâinformation nutritionnelle officiel pour la France.MalgrĂ© des rĂ©sistances initiales, le Nutri-Score a Ă©tĂ© adoptĂ© sur la base du volontariat par plus de 200 entreprises, distributeurs et industriels, reprĂ©sentant fin 2019 plus de 20% des parts de marchĂ© des produits laitiers, des plats cuisinĂ©s et des aliments transformĂ©s suivis par lâObservatoire de lâalimentation (OQALI).Cette Ă©volution prĂ©sage dâun impact nutritionnel potentiellement important pour les consommateurs, dans la mesure oĂč le Nutri-Score leur donnera les moyens dâamĂ©liorer la qualitĂ© nutritionnelle de leurs achats alimentaires. Dâautre part, on observe que les industriels ont engagĂ© les premiĂšres reformulations nutritionnelles de leurs produits alimentaires, afin dâamĂ©liorer leurs scores. Le Nutri-Score a rapidement dĂ©passĂ© les frontiĂšres françaises : il a Ă©tĂ© adoptĂ© en Belgique en 2018 puis en Allemagne et en Espagne en 2019. Le succĂšs de cette initiative alimente un dĂ©bat Ă lâĂ©chelle europĂ©enne sur lâopportunitĂ© dâharmoniser lâĂ©tiquetage en face avant des emballages. Sept associations membres du Bureau EuropĂ©en des Unions de Consommateurs (Beuc) ont lancĂ© une Initiative Citoyenne EuropĂ©enne visant Ă inciter la Commission EuropĂ©enne Ă rendre obligatoire le Nutri-Score sur les emballages alimentaires en Europe. En France, lâAssemblĂ©e Nationale a votĂ© en 2019 un amendement pour rendre lâutilisation du Nutri-Score obligatoire pour la publicitĂ© alimentaire. Les pouvoirs publics ont Ă©galement annoncĂ© son extension Ă la restauration collective et aux aliments vendus en vrac. Les associations de consommateurs françaises militent pour la crĂ©ation dâun dispositif dâĂ©tiquetage analogue des produits mĂ©nagers
SystĂšme dâinformation nutritionnelle en face avant des emballages : Nutri-Score. Etude de cas ASIRPA
LâInra, en partenariat avec lâuniversitĂ© Paris-XIII (UniversitĂ© Sorbonne Paris Nord), lâInserm, le Cnam et Grenoble INP, a contribuĂ© Ă dĂ©velopper un Ă©tiquetage nutritionnel Ă cinq couleurs, le Nutri-Score, dont lâobjectif est dâinciter les Français Ă limiter leur consommation de produits riches en gras, en sel, en sucre et en calories, pour lutter contre la progression de lâobĂ©sitĂ© et des maladies chroniques. Au terme dâun dĂ©bat public animĂ©, dâune Ă©tude grandeur nature testant quatre systĂšmes dâinformation, et de travaux de recherche qui ont constituĂ© progressivement un dossier scientifique permettant de soutenir la dĂ©cision politique, un arrĂȘtĂ© interministĂ©riel a reconnu en octobre 2017 le Nutri-Score comme le systĂšme dâinformation nutritionnelle officiel pour la France.MalgrĂ© des rĂ©sistances initiales, le Nutri-Score a Ă©tĂ© adoptĂ© sur la base du volontariat par plus de 200 entreprises, distributeurs et industriels, reprĂ©sentant fin 2019 plus de 20% des parts de marchĂ© des produits laitiers, des plats cuisinĂ©s et des aliments transformĂ©s suivis par lâObservatoire de lâalimentation (OQALI).Cette Ă©volution prĂ©sage dâun impact nutritionnel potentiellement important pour les consommateurs, dans la mesure oĂč le Nutri-Score leur donnera les moyens dâamĂ©liorer la qualitĂ© nutritionnelle de leurs achats alimentaires. Dâautre part, on observe que les industriels ont engagĂ© les premiĂšres reformulations nutritionnelles de leurs produits alimentaires, afin dâamĂ©liorer leurs scores. Le Nutri-Score a rapidement dĂ©passĂ© les frontiĂšres françaises : il a Ă©tĂ© adoptĂ© en Belgique en 2018 puis en Allemagne et en Espagne en 2019. Le succĂšs de cette initiative alimente un dĂ©bat Ă lâĂ©chelle europĂ©enne sur lâopportunitĂ© dâharmoniser lâĂ©tiquetage en face avant des emballages. Sept associations membres du Bureau EuropĂ©en des Unions de Consommateurs (Beuc) ont lancĂ© une Initiative Citoyenne EuropĂ©enne visant Ă inciter la Commission EuropĂ©enne Ă rendre obligatoire le Nutri-Score sur les emballages alimentaires en Europe. En France, lâAssemblĂ©e Nationale a votĂ© en 2019 un amendement pour rendre lâutilisation du Nutri-Score obligatoire pour la publicitĂ© alimentaire. Les pouvoirs publics ont Ă©galement annoncĂ© son extension Ă la restauration collective et aux aliments vendus en vrac. Les associations de consommateurs françaises militent pour la crĂ©ation dâun dispositif dâĂ©tiquetage analogue des produits mĂ©nagers