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Positive Reinforcing Mechanisms between GPR120 and PPAR gamma Modulate Insulin Sensitivity

机译:GPR120与PPARγ与PPARγ的阳性增强机制调节胰岛素敏感性

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摘要

G protein-coupled receptor 120 (GPR120) and PPAR gamma agonists each have insulin sensitizing effects. But whether these two pathways functionally interact and can be leveraged together to markedly improve insulin resistance has not been explored. Here, we show that treatment with the PPAR gamma agonist rosiglitazone (Rosi) plus the GPR120 agonist Compound A leads to additive effects to improve glucose tolerance and insulin sensitivity, but at lower doses of Rosi, thus avoiding its known side effects. Mechanistically, we show that GPR120 is a PPAR gamma target gene in adipocytes, while GPR120 augments PPAR gamma activity by inducing the endogenous ligand 15d-PGJ2 and by blocking ERK-mediated inhibition of PPAR gamma. Further, we used macrophage- (MKO) or adipocyte-specific GPR120 KO (AKO) mice to show that GRP120 has anti-inflammatory effects via macrophages while working with PPAR gamma in adipocytes to increase insulin sensitivity. These results raise the prospect of a safer way to increase insulin sensitization in the clinic.
机译:G蛋白偶联受体120(GPR120)和PPARγ激动剂均具有胰岛素增敏作用。但是,这两种途径是否在功能上相互作用,并能一起被利用来显著改善胰岛素抵抗,尚未被探索。在这里,我们表明,使用PPARγ激动剂罗格列酮(Rosi)加上GPR120激动剂化合物A的治疗可产生相加效应,以改善葡萄糖耐受性和胰岛素敏感性,但使用较低剂量的罗格列酮,从而避免其已知的副作用。从机理上讲,我们表明GPR120是脂肪细胞中的PPARγ靶基因,而GPR120通过诱导内源性配体15d-PGJ2和阻断ERK介导的PPARγ抑制来增强PPARγ活性。此外,我们使用巨噬细胞-(MKO)或脂肪细胞特异性GPR120-KO(AKO)小鼠证明,GRP120通过巨噬细胞具有抗炎作用,同时与脂肪细胞中的PPARγ一起增加胰岛素敏感性。这些结果为临床上提高胰岛素敏感性提供了一种更安全的方法。

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  • 来源
    《Cell metabolism》 |2020年第6期|共21页
  • 作者单位

    Univ Texas Southwestern Med Ctr Dallas Dept Internal Med Touchstone Diabet Ctr Dallas TX 75390;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Salk Inst Biol Studies Gene Express Lab La Jolla CA 92037 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Pharmacol La Jolla CA 92093 USA;

    Salk Inst Biol Studies Gene Express Lab La Jolla CA 92037 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Pharmacol La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Med Div Endocrinol &

    Metab La Jolla CA 92093 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Internal Med Touchstone Diabet Ctr Dallas TX 75390;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 内分泌腺疾病及代谢病;
  • 关键词

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