Department of Experimental Medicine, Sapienza University of Rome, 00161 Rome, Italy.
Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy.
Int J Mol Sci. 2020 Sep 29;21(19):7197. doi: 10.3390/ijms21197197.
Angiopoietin-like protein 4 (ANGPTL4) regulates lipid partitioning by inhibiting circulating and tissue lipoprotein lipase (LPL); ANGPTL4 loss-of-function variants improve insulin sensitivity and reduce type 2 diabetes (T2D) risk with mechanisms partially unknown. This study was designed to explore metabolic implications of differential ANGPTL4 and LPL expression in human adipose tissue (AT). We recruited eighty-eight obese individuals, with and without abnormal glucose metabolism (AGM), undergoing bariatric surgery; visceral AT (VAT) fragments were obtained intra-operatively and analyzed by immunohistochemistry and mRNA by rt-PCR. Data on hepatic ANGPTL4 mRNA were available for 40 participants. VAT ANGPTL4 expression was higher in AGM individuals than in those with normal glucose tolerance (NGT) and associated with VAT inflammation, insulin resistance, and presence of adipocyte size heterogeneity. Increased ANGPTL4 was associated with AGM with OR = 5.1 (95% C.I.: 1.2-23; = 0.02) and AUROC = 0.76 (95% C.I.: 1.2-23; < 0.001). High LPL was associated with the detection of homogeneous adipocyte size, reduced microvessel density, and higher HIF-1α levels and inversely correlated to blood transaminases. In conclusion, in obese individuals, VAT ANGPTL4 levels are increased in the presence of local inflammation and AGM. Conversely, higher LPL expression describes a condition of increased lipid storage in adipocytes, which may serve as a protective mechanism against ectopic fat accumulation and related metabolic disease in obesity.
血管生成素样蛋白 4(ANGPTL4)通过抑制循环和组织脂蛋白脂肪酶(LPL)来调节脂质分配;ANGPTL4 功能丧失变异可改善胰岛素敏感性并降低 2 型糖尿病(T2D)风险,但其机制尚不完全清楚。本研究旨在探讨人脂肪组织(AT)中 ANGPTL4 和 LPL 表达差异的代谢意义。我们招募了 88 名接受减肥手术的肥胖个体,包括伴有和不伴有异常葡萄糖代谢(AGM)的个体;术中获得内脏脂肪组织(VAT)片段,并通过免疫组织化学和 rt-PCR 分析 mRNA。40 名参与者的肝 ANGPTL4 mRNA 数据可用。AGM 个体的 VAT ANGPTL4 表达高于葡萄糖耐量正常(NGT)个体,与 VAT 炎症、胰岛素抵抗和存在脂肪细胞大小异质性有关。增加的 ANGPTL4 与 AGM 相关,OR = 5.1(95%CI:1.2-23; = 0.02)和 AUROC = 0.76(95%CI:1.2-23; < 0.001)。高 LPL 与同质脂肪细胞大小的检测、微血管密度降低、HIF-1α 水平升高有关,与血液转氨酶呈负相关。总之,在肥胖个体中,VAT ANGPTL4 水平在局部炎症和 AGM 存在时增加。相反,较高的 LPL 表达描述了脂肪细胞中脂质储存增加的情况,这可能是肥胖相关异位脂肪积累和相关代谢疾病的一种保护机制。
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