Family with sequence similarity 13, member A modulates adipocyte insulin signaling and preserves systemic metabolic homeostasis.

Family with sequence similarity 13, member A modulates adipocyte insulin signaling and preserves systemic metabolic homeostasis.
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具有序列相似性的家族 13,成员 A 调节脂肪细胞胰岛素信号传导并保持全身代谢稳态。

DOI:
10.1073/pnas.1720475115
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发表时间:
2018
影响因子:
11.1
通讯作者:
Emoto,Noriaki
Emoto,Noriaki
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wardhana,DonytraArby;Ikeda,Koji;Barinda,AgianJeffilano;Nugroho,DhiteBayu;Qurania,KikidRucira;Yagi,Keiko;Miyata,Keishi;Oike,Yuichi;Hirata,Ken-Ichi;Emoto,Noriaki

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脂肪组织功能障碍与肥胖相关的代谢稳态受损有因果关系;然而,肥胖中脂肪细胞功能失调的详细机制仍有待阐明。在这里,我们寻找的基因,提供了一个以前未知的机制,在脂肪细胞的代谢功能,并确定了家庭与序列相似性13,成员A(Fam 13 a)作为一个因素,修改胰岛素信号级联脂肪细胞。Fam 13 a在脂肪组织中高度表达,主要在成熟脂肪细胞中,并且与瘦小鼠相比,其在肥胖小鼠脂肪组织中的表达显著降低。我们发现,Fam 13 a通过招募蛋白磷酸酶2A与胰岛素受体底物1(IRS 1),从而保护IRS 1免受蛋白酶体降解,从而增强胰岛素信号传导。我们进一步证明,Fam 13 a的遗传丢失会加剧肥胖相关的代谢紊乱,而脂肪细胞中Fam 13 a的靶向激活与小鼠脂肪组织胰岛素敏感性的改变相关,可以改善肥胖相关的代谢紊乱。我们的数据揭示了Fam 13 a调节脂肪细胞胰岛素信号传导的一种以前未知的机制,并确定了其在全身代谢稳态中的重要作用,阐明了Fam 13 a作为治疗肥胖相关代谢紊乱的药物靶点。
Adipose tissue dysfunction is causally implicated in the impaired metabolic homeostasis associated with obesity; however, detailed mechanisms underlying dysregulated adipocyte functions in obesity remain to be elucidated. Here we searched for genes that provide a previously unknown mechanism in adipocyte metabolic functions and identified family with sequence similarity 13, member A (Fam13a) as a factor that modifies insulin signal cascade in adipocytes. Fam13a was highly expressed in adipose tissue, predominantly in mature adipocytes, and its expression was substantially reduced in adipose tissues of obese compared with lean mice. We revealed that Fam13a accentuated insulin signaling by recruiting protein phosphatase 2A with insulin receptor substrate 1 (IRS1), leading to protection of IRS1 from proteasomal degradation. We further demonstrated that genetic loss of Fam13a exacerbated obesity-related metabolic disorders, while targeted activation of Fam13a in adipocytes ameliorated it in association with altered adipose tissue insulin sensitivity in mice. Our data unveiled a previously unknown mechanism in the regulation of adipocyte insulin signaling by Fam13a and identified its significant role in systemic metabolic homeostasis, shedding light on Fam13a as a pharmacotherapeutic target to treat obesity-related metabolic disorders.
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