HDL activation of endothelial sphingosine-1-phosphate receptor-1 (S1P₁) promotes regeneration and suppresses fibrosis in the liver.

ABSTRACT: Regeneration of hepatic sinusoidal vasculature is essential for non-fibrotic liver regrowth and restoration of its metabolic capacity. However, little is known about how this specialized vascular niche is regenerated. Here we show that activation of endothelial sphingosine-1-phosphate receptor-1 (S1P₁) by its natural ligand bound to HDL (HDL-S1P) induces liver regeneration and curtails fibrosis. In mice lacking HDL-S1P, liver regeneration after partial hepatectomy was impeded and associated with aberrant vascular remodeling, thrombosis and peri-sinusoidal fibrosis. Notably, this "maladaptive repair" phenotype was recapitulated in mice that lack S1P₁ in the endothelium. Reciprocally, enhanced plasma levels of HDL-S1P or administration of SEW2871, a pharmacological agon

SUBMITTER: Ding BS 

PROVIDER: S-EPMC5161208 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature