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首页> 外文期刊>Cell biology international. >All-trans retinoic acid displays multiple effects on the growth, lipogenesis and adipokine gene expression of AML-I preadipocyte cell line.
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All-trans retinoic acid displays multiple effects on the growth, lipogenesis and adipokine gene expression of AML-I preadipocyte cell line.

机译:全反式维甲酸对AML-1前脂肪细胞系的生长,脂肪生成和脂肪因子基因表达表现出多种作用。

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摘要

Adipose tissue is a potential site of retinoic acid (RA) action, but its physiological significance remains to be clarified. We have examined the effect of all-trans retinoic acid (ATRA) on growth and differentiation of preadipocytes, and on adipokine gene expression in mature adipocytes using human preadipocyte cell model, AML-I. Both ATRA and 9-cis RA induced growth arrest in AML-I preadipocyte at between 50 and 100?μM, which was accompanied by apoptosis. Western blotting showed a loss of NF-κB, Bcl-2 and p-Akt, and the accumulation of Bad and Akt in cytoplasm of ATRA-treated AML-I preadipocytes. Exposure of AML-I to ATRA or 9-cis RA increased intracellular lipid accumulation in a time-dependent manner compared to vehicle-treated cells. Expression of fatty acid synthase (FAS) and peroxisome proliferator-activated receptor-γ (PPAR-γ) proteins was increased in ATRA-treated cells. Thus, both ATRA and 9-cis RA promoted differentiation, inhibited proliferation and induced apoptosis in AML-I preadipocytes. ATRA also modulated adipokine expression by increasing the mRNA level of adipocytokines (adiponectin, leptin and LPL), and by inhibiting PAI-1 mRNA expression in mature AML-I adipocytes. The data suggest that ATRA exerts a wide range of effects-growth arrest, apoptosis, lipogenesis and modulation of adipokine gene expression-during the maturation of preadipocytes into adipocytes.
机译:脂肪组织是视黄酸(RA)作用的潜在部位,但其生理学意义尚待阐明。我们已经使用人前脂肪细胞模型AML-1检查了全反式维甲酸(ATRA)对前脂肪细胞的生长和分化以及成熟脂肪细胞中脂肪因子基因表达的影响。 ATRA和9-cis RA均可诱导AML-1前脂肪细胞的生长停滞在50至100?M之间,并伴有细胞凋亡。 Western印迹显示NF-κB,Bcl-2和p-Akt缺失,Bad和Akt在ATRA处理的AML-1前脂肪细胞的细胞质中积累。与媒介物处理的细胞相比,将AML-1暴露于ATRA或9-cis RA会以时间依赖性方式增加细胞内脂质的积累。在ATRA处理的细胞中,脂肪酸合酶(FAS)和过氧化物酶体增殖物激活的受体-γ(PPAR-γ)蛋白的表达增加。因此,ATRA和9-顺式RA都促进AML-1前脂肪细胞的分化,抑制增殖并诱导凋亡。 ATRA还通过增加脂肪细胞因子(脂联素,瘦素和LPL)的mRNA水平以及抑制成熟AML-1脂肪细胞中PAI-1 mRNA的表达来调节脂肪因子的表达。数据表明,在前脂肪细胞成熟为脂肪细胞的过程中,ATRA发挥了广泛的作用,包括生长停滞,凋亡,脂肪生成和对脂肪因子基因表达的调节。

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