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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Bi-Sen Ding
  • Catherine H Liu
  • Yue Sun
  • Yutian Chen
  • Steven L Swendeman
  • Bongnam Jung
  • Deebly Chavez
  • Zhongwei Cao
  • Christoffersen, Christina
  • Lars Bo Nielsen
  • Susan R Schwab
  • Shahin Rafii
  • Timothy Hla

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 agonist specific for S1P1 enhanced regeneration of metabolically functional vasculature and alleviated fibrosis in mouse chronic injury and cholestasis models. This study shows that natural and pharmacological ligands modulate endothelial S1P1 to stimulate liver regeneration and inhibit fibrosis, suggesting that activation of this pathway may be a novel therapeutic strategy for liver fibrosis.

OriginalsprogEngelsk
Artikelnummere87058
TidsskriftJCI insight
Vol/bind1
Udgave nummer21
Antal sider16
ISSN2379-3708
DOI
StatusUdgivet - 22 dec. 2016

ID: 172616600