Endocannabinoid receptor blockade increases vascular endothelial growth factor and inflammatory markers in obese women with polycystic ovary syndrome

Abstract

Context

Animal studies suggest that cannabinoid receptor-1 (CB-1) blockade reduces inflammation and neovascularization by decreasing vascular endothelial growth factor (VEGF) levels associated with a reduction in inflammatory markers, thereby potentially reducing cardiovascular risk.

Objective

To determine the impact of CB1 antagonism by rimonabant on VEGF and inflammatory markers in obese PCOS women.

Design

Randomised, open-labelled parallel study.

Setting

Endocrinology outpatient clinic in a referral centre.

Subjects

Twenty patients with PCOS and biochemical hyperandrogenaemia with a body mass index of ≥ 30kg/m² were recruited. Patients were randomised to 1.5g daily of metformin or 20mg daily of rimonabant.

Main Outcome Measures

Post hoc review to detect VEGF and pro-inflammatory cytokines TNF-α, IL-1β, IL-1ra, IL-2, IL6, IL-8, IL-10 and MCP-1 before and after 12 weeks treatment.

Results

After 12 weeks of rimonabant there was a significant increase in VEGF (99.2±17.6 vs 116.2±15.8pg/ml, p<0.01) and IL-8 (7.4±11.0 vs 18.1±13.2pg/ml, p<0.05) but not after metformin (VEGF p=0.7; IL-8 p=0.9). There was no significant difference in the pro-inflammatory cytokines TNF-α, IL-1β, IL-1ra, IL-2, IL6, IL-8, IL-10 and MCP-1 following either treatment.

Conclusion

This study suggests that rimonabant CB-I blockade paradoxically raised VEGF and the cytokine IL-8 in obese women with PCOS that may have offset the potential benefit associated with weight loss.

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