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首页> 外文期刊>European Journal of Histochemistry >The selective blockade of metabotropic glutamate receptor-5 attenuates fat accumulation in an emin vitro/em model of benign steatosis
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The selective blockade of metabotropic glutamate receptor-5 attenuates fat accumulation in an emin vitro/em model of benign steatosis

机译:代谢性谷氨酸受体-5的选择性阻断衰减在良性脂肪变量中的中的脂肪积累

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摘要

It has been previously found that the blockade of metabotropic glutamate receptor type 5 (mGluR5) protects against hepatic ischemia/reperfusion injury and acetaminophen toxicity. The role of mGluR5 in NAFLD has not yet been elucidated. Here, we evaluated the effects of mGluR5 blockade in an in vitro model of steatosis. HepG2 cells were pre-incubated for 12 h with an mGluR5 agonist, a negative allosteric modulator (DHPG and MPEP, respectively) or vehicle, then treated with 1.5 mM oleate/palmitate (O/P) for another 12 h. Cell viability was evaluated with the MTT assay; fat accumulation was measured using the fluorescent dye nile red; SREBP-1, PPAR-α, iNOS and Caspase-3 protein expression were evaluated by Western blot; NFkB activity was evaluated as pNFkB/NFkB ratio. mGluR5 modulation did not alter cell viability in O/P-incubated cells; MPEP prevented intracellular lipid accumulation in O/P treated cells; MPEP administration was also associated with a reversion of O/P-induced changes in SREBP-1 and PPAR-α expression, involved in free fatty acid (FFA) metabolism and uptake. No changes were observed in iNOS and Caspase-3 expression, or in NFkB activity. In conclusion, mGluR5 pharmacological blockade reduced fat accumulation in HepG2 cells incubated with O/P, probably by modulating the expression of SREBP-1 and PPAR-α.
机译:先前已经发现,代谢性谷氨酸受体类型5(MGLUR5)的阻断保护肝缺血/再灌注损伤和乙酰氨基酚毒性。 MGLUR5在NAFLD的作用尚未阐明。在这里,我们评估了MGLUR5封闭在体外模型的脂肪化模型中的影响。用MgluR5激动剂,负颠aroseric调制剂(DHPG和MPEP)或载体预孵育12小时,然后用1.5mM油酸/棕榈酸酯(O / P)进行另外12小时。用MTT测定评估细胞活力;使用荧光染料尼罗红测量脂肪积聚;通过Western印迹评估SrebP-1,PPAR-α,InOS和Caspase-3蛋白表达; NFKB活性被评估为PNFKB / NFKB比率。 MGLUR5调节在O / P孵育的细胞中没有改变细胞活力; MPEP防止了O / P处理细胞中的细胞内脂质积累; MPEP给药也与SREBP-1和PPAR-α表达中的O / P诱导的变化的逆转相关,参与游离脂肪酸(FFA)代谢和摄取。在InOS和Caspase-3表达中或在NFKB活性中没有观察到任何变化。总之,MGLUR5药理学阻断降低了与O / P孵育的HepG2细胞中的脂肪积累,可能通过调节Srebp-1和PPAR-α的表达。

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