Journal Article

Endocannabinoid receptor blockade reduces alanine aminotransferase in polycystic ovary syndrome independent of weight loss

Atkin, Stephen L., Ahmed, Lina, Dakroury, Youssra, Kilpatrick, Eric S., Dawson, Alison J., Elshewehy, Abeer M. M., Sathyapalan, Thozhukat, Coady, Anne-Marie

2017

Overview

Background Evidence suggests that endocannabinoid system activation through the cannabinoid receptor 1 (CB1) is associated with enhanced liver injury, and CB1 antagonism may be beneficial. The aim of this study was to determine the impact of rimonabant (CB1 antagonist) on alanine aminotransferase (ALT), a hepatocellular injury marker, and a hepatic inflammatory cytokine profile. Methods Post hoc review of 2 studies involving 50 obese women with PCOS and well matched for weight, randomised to weight reducing therapy; rimonabant (20 mg od) or orlistat (120 mg tds), or to insulin sensitising therapy metformin, (500 mg tds), or pioglitazone (45 mg od). No subject had non-alcoholic fatty liver disease (NAFLD). Results Treatment with rimonabant for 12 weeks reduced both ALT and weight ( p  < 0.01), and there was a negative correlation between Δ ALT and Δ HOMA-IR ( p  < 0.001), but not between Δ ALT and Δ weight. There was a significant reduction of weight with orlistat ( p  < 0.01); however, orlistat, metformin and pioglitazone had no effect on ALT. The free androgen index fell in all groups ( p  < 0.05). The inflammatory marker hs-CRP was reduced by pioglitazone ( p  < 0.001) alone and did not correlate with changes in ALT. The inflammatory cytokine profile for IL-1β, IL-6, IL-7, IL-10, IL12, TNF-α, MCP-1 and INF-γ did not differ between groups. None of the interventions had an effect on biological variability of ALT. Conclusion Rimonabant through CB1 receptor blockade decreased serum ALT that was independent of weight loss and hepatic inflammatory markers in obese women with PCOS without NAFLD. Trial registration ISRCTN58369615 (February 2007; retrospectively registered) ISRCTN75758249 (October 2007; retrospectively registered).

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
• Subject: Alanine / Alanine transaminase / Alanine Transaminase - metabolism / Alt / Anti-Obesity Agents - pharmacology / Basic and Clinical Endocrinology / Body Mass Index / Cannabinoid CB1 receptors / Cannabinoid Receptor Antagonists - pharmacology / Case-Control Studies / Cytokines / Diabetes / Endocannabinoid system / Endocrinology / Fatty liver / Female / Follow-Up Studies / Health aspects / Humans / Hypoglycemic Agents - pharmacology / Inflammation / Insulin / Insulin Resistance / Interleukin 1 / Interleukin 10 / Interleukin 12 / Interleukin 6 / Interleukin 7 / Lactones - pharmacology / Liver diseases / Liver Diseases - physiopathology / Medicine / Medicine & Public Health / Metabolic Diseases / Metformin / Metformin - pharmacology / Monocyte chemoattractant protein 1 / Nafld / Obesity - physiopathology / Pioglitazone / Piperidines - pharmacology / Polycystic ovarian syndrome / Polycystic ovary syndrome / Polycystic Ovary Syndrome - drug therapy / Polycystic Ovary Syndrome - enzymology / Polycystic Ovary Syndrome - pathology / Prognosis / Pyrazoles - pharmacology / Receptor, Cannabinoid, CB1 - antagonists & inhibitors / Research Article / Retrospective Studies / Rimonabant / rology / Thiazolidinediones - pharmacology / Tumor necrosis factor / Weight loss / Weight Loss - drug effects