GLP-1 improves adipose tissue glyoxalase activity and capillarization improving insulin sensitivity in type 2 diabetes. (November 2020)

• Record Type: Journal Article
• Authors: Rodrigues, Tiago; Borges, Patrícia; Mar, Laura; Marques, Daniela; Albano, Miguel; Eickhoff, Hans; Carrêlo, Catarina; Almeida, Bruno; Pires, Salomé; Abrantes, Margarida; Martins, Beatriz; Uriarte, Cristina; Botelho, Filomena; Gomes, Pedro; Silva, Sónia; Seiça, Raquel; Matafome, Paulo
• Is Part Of: Pharmacological research. Volume 161(2020)
• Publication Date: 2020-11
• Subjects: Adipose tissue -- Glyoxalase -- GLP-1 -- Capillarization -- Insulin resistance -- Liraglutide; Pharmacology -- Periodicals; Pharmacology -- Periodicals; Research -- Periodicals; Médicaments -- Recherche -- Périodiques; Pharmacologie -- Périodiques; 615.105
• DOI: 10.1016/j.phrs.2020.105198
• Languages: English
• ISSNs: 1043-6618

Abstract

Graphical abstract: Abstract: Methylglyoxal was shown to impair adipose tissue capillarization and insulin sensitivity in obese models. We hypothesized that glyoxalase-1 (GLO-1) activity could be diminished in the adipose tissue of type 2 diabetic obese patients. Moreover, we assessed whether such activity could be increased by GLP-1-based therapies in order to improve adipose tissue capillarization and insulin sensitivity. GLO-1 activity was assessed in visceral adipose tissue of a cohort of obese patients. The role of GLP-1 in modulating GLO-1 was assessed in type 2 diabetic GK rats submitted to sleeve gastrectomy or Liraglutide treatment, in the adipose tissue angiogenesis assay and in the HUVEC cell line. Glyoxalase-1 activity was decreased in visceral adipose tissue of pre-diabetic and diabetic obese patients, together with other markers of adipose tissue dysfunction and correlated with increased HbA1c levels. Decreased adipose tissue GLO-1 levels in GK rats were increased by sleeve gastrectomy and Liraglutide, being associated with overexpression of angiogenic and vasoactive factors, as well as insulin receptor phosphorylation (Tyr1161). Moreover, GLP-1 increased adipose tissue capillarization and HUVEC proliferation in a glyoxalase-dependent manner. Lower adipose tissue GLO-1 activity was observed in dysmetabolic patients, being a target for GLP-1 in improving adipose tissue capillarization and insulin sensitivity.