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| 1 | Rnf20 deficiency in adipocyte impairs adipose tissue development and thermogenesis显示文摘RNF20,an E3 ligase critical for monoubiquitination of histone H2B at lysine 120(H2Bub),has been implicated in the regulation of various cellar processes;however,its physiological roles in adipocytes remain poorly characterized.Here,we report that the adipocyte-specific knockout of Rnf20(ASKO)in mice led to progressive fat toss,organomegaly and hyperinsulinemia.Despite signs of hyperinsulinemia,normal insulin sensitivity and improved glucose tolerance were observed in the young and aged CD-fed ASKO mice.In addition,high-fat diet-fed ASKO mice developed severe liver steatosis.Moreover,we observed that the ASKO mice were extremely sensitive to a cold environment due to decreased expression levels of brown adipose tissue(BAT)selective genes,including uncoupling protein 1(l/cpf),and impaired mitochondrial functions.Significantly decreased levels of peroxisome proliterator-activated receptor gamma(Ppary)were observed in the gonadal white adipose tissues(gWAT)from the ASKO mice,suggesting that Rnf20 regulates adipogenesis,at least in part,through Ppary.Rosiglitazone-treated ASKO mice exhibited increased fat mass compared to that of the non-treated ASKO mice.Collectively,our results illustrate the critical role of RNF20 in control of white and brown adipose tissue development and physiological function. | Xiaojuan Liang Cong Tao Jianfei Pan Lilan Zhang Lulu Liu Ying Zhao Yiping Fan Chunwei Cao Jiali Liu Jin Zhang Sin Man Lam Guanghou Shui Wanzhu Jin Wei Li Jianguo Zhao Kui Li Yanfang Wang | 2021 | Protein & Cell2021，12，6： | 1 |
| 2 | RNF20及其介导的组蛋白H2B单泛素化对小鼠棕色脂肪细胞分化的影响显示文摘旨在研究RNF20及其介导的组蛋白H2B第120位赖氨酸的单泛素化(H2Bub)对小鼠棕色脂肪细胞成脂分化的影响。采集1日龄和2月龄雄性C57BL/6小鼠的棕色脂肪组织(n=3),用Western blot方法检测RNF20的表达及其介导的H2Bub水平。利用胶原酶消化法分离获得1日龄小鼠的棕色前体脂肪细胞。分别诱导棕色前体脂肪细胞和C3H10T1/2细胞系成脂分化,通过油红O染色检测其分化效果,进一步通过Western blot检测细胞分化前后(0和8 d)RNF20的表达及其介导的H2Bub水平。通过siRNA干扰Rnf20基因在C3H10T1/2细胞系中的表达,油红O染色方法观察Rnf20基因对成脂分化的影响,利用qPCR和Western blot技术检测Rnf20基因的干扰效率及其介导的H2Bub水平。结果显示,2月龄小鼠棕色脂肪组织中RNF20表达量及其介导的H2Bub水平均显著高于1日龄小鼠。脂肪细胞分化标记蛋白PPARγ和CEBPα的表达水平,RNF20表达量及其介导的H2Bub水平在棕色前体脂肪细胞及C3H10T1/2细胞成脂分化后均显著增加。此外,在C3H10T1/2细胞中敲降Rnf20基因后,与阴性对照组相比,RNF20及其介导的H2Bub水平显著降低,成脂分化后脂滴明显减少。综上表明,RNF20对小鼠棕色脂肪细胞的分化是必需的,敲降Rnf20基因导致组蛋白H2Bub水平显著降低,且降低了C3H10T1/2细胞的成脂分化效率。本研究丰富了小鼠棕色脂肪细胞分化过程中的表观遗传调控研究,为深入理解动物脂肪细胞分化提供了新的基因素材。 | 梁小娟 陶聪 赵莹 王超 刘璐璐 王彦芳 | 2020 | 畜牧兽医学报2020，51，4： | 0 |
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