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Clin Sci (Lond). 2018 Jan 5;132(1):69-83. doi: 10.1042/CS20171221. Print 2018 Jan 16.

TRAIL reduces impaired glucose tolerance and NAFLD in the high-fat diet fed mouse.

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Department of Medical Sciences, Università degli Studi di Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, Trieste 34100, Italy
Department of Advanced Diagnostic, Institute for Maternal and Child Health, IRCCS 'Burlo Garofolo', Via dell'Istria 65, Trieste 34137, Italy.
Animal Care Unit, Department of Morphology, Surgery and Experimental Medicine and LTTA Centre, Università degli Studi di Ferrara, Via Fossato di Mortara 66, Ferrara 44100, Italy.
Department of Medical Sciences, Università degli Studi di Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, Trieste 34100, Italy.
Cluster in Biomedicine, CBM S.c.r.l., Area Science Park, Trieste, Italy.


Recent studies suggest that a circulating protein called TRAIL (TNF-related apoptosis inducing ligand) may have an important role in the treatment of type 2 diabetes. It has been shown that TRAIL deficiency worsens diabetes and that TRAIL delivery, when it is given before disease onset, slows down its development. The present study aimed at evaluating whether TRAIL had the potential not only to prevent, but also to treat type 2 diabetes. Thirty male C57BL/6J mice were randomized to a standard or a high-fat diet (HFD). After 4 weeks of HFD, mice were further randomized to receive either placebo or TRAIL, which was delivered weekly for 8 weeks. Body weight, food intake, fasting glucose, and insulin were measured at baseline and every 4 weeks. Tolerance tests were performed before drug randomization and at the end of the study. Tissues were collected for further analyses. Parallel in vitro studies were conducted on HepG2 cells and mouse primary hepatocytes. TRAIL significantly reduced body weight, adipocyte hypertrophy, free fatty acid levels, and inflammation. Moreover, it significantly improved impaired glucose tolerance, and ameliorated non-alcoholic fatty liver disease (NAFLD). TRAIL treatment reduced liver fat content by 47% in vivo as well as by 45% in HepG2 cells and by 39% in primary hepatocytes. This was associated with a significant increase in liver peroxisome proliferator-activated receptor (PPAR) γ (PPARγ) co-activator-1 α (PGC-1α) expression both in vivo and in vitro, pointing to a direct protective effect of TRAIL on the liver. The present study confirms the ability of TRAIL to significantly attenuate diet-induced metabolic abnormalities, and it shows for the first time that TRAIL is effective also when administered after disease onset. In addition, our data shed light on TRAIL therapeutic potential not only against impaired glucose tolerance, but also against NAFLD.


NAFLD; PGC-1alpha; TRAIL; high-fat diet; impaired glucose tolerance; type 2 diabetes

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