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Open AccessArticle

Angiopoietin-Like Protein 4 Overexpression in Visceral Adipose Tissue from Obese Subjects with Impaired Glucose Metabolism and Relationship with Lipoprotein Lipase

1
Department of Experimental Medicine, Sapienza University of Rome, 00161 Rome, Italy
2
Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy
3
Cardiometabolic Risk Unit, Institute of Clinical Physiology, CNR, 56100 Pisa, Italy
4
Department of Clinical Medicine, Public Health, Life and Environmental Sciences (MeSVA) University of L’Aquila, 67100 Coppito (AQ) Italy
5
IRCCS Neuromed, 86077 Pozzilli (Is), Italy
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(19), 7197; https://doi.org/10.3390/ijms21197197
Received: 12 September 2020 / Accepted: 26 September 2020 / Published: 29 September 2020
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; p = 0.02) and AUROC = 0.76 (95% C.I.: 1.2–23; p < 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. View Full-Text
Keywords: ANGPTL4; lipoprotein lipase; lipids; adipose tissue; adipocyte; diabetes; glucose tolerance ANGPTL4; lipoprotein lipase; lipids; adipose tissue; adipocyte; diabetes; glucose tolerance
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Barchetta, I.; Chiappetta, C.; Ceccarelli, V.; Cimini, F.A.; Bertoccini, L.; Gaggini, M.; Cristofano, C.D.; Silecchia, G.; Lenzi, A.; Leonetti, F.; Baroni, M.G.; Gastaldelli, A.; Cavallo, M.G. Angiopoietin-Like Protein 4 Overexpression in Visceral Adipose Tissue from Obese Subjects with Impaired Glucose Metabolism and Relationship with Lipoprotein Lipase. Int. J. Mol. Sci. 2020, 21, 7197.

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