Sphingosine 1-Phosphate Receptor 2 and 3 Mediate Bone Marrow-Derived Monocyte/Macrophage Motility in Cholestatic Liver Injury in Mice

Scientific Reports
Le YangLiying Li

Abstract

Sphingosine 1-phosphate (S1P)/S1P receptor (S1PR) system has been implicated in the pathological process of liver injury. This study was designed to evaluate the effects of S1P/S1PR on bone marrow-derived monocyte/macrophage (BMM) migration in mouse models of cholestatic liver injury, and identify the signaling pathway underlying this process. S1PR1-3 expression in BMM was characterized by immunofluorescence, RT-PCR and Western blot. Cell migration was determined in Boyden chambers. In vivo, the chimera mice, which received BM transplants from EGFP-transgenic mice, received an operation of bile duct ligation (BDL) to induce liver injury with the administration of S1PR2/3 antagonists. The results showed that S1PR1-3 were all expressed in BMMs. S1P exerted a powerful migratory action on BMMs via S1PR2 and S1PR3. Furthermore, PTX and LY-294002 (PI3K inhibitor) prevented S1PR2/3-mediated BMM migration, and Rac1 activation by S1P was inhibited by JTE-013, CAY-10444 or LY294002. Administration of S1PR2/3 antagonists in vivo significantly reduced BMM recruitment in BDL-treated mice, and attenuated hepatic inflammation and fibrosis. In conclusion, S1P/S1PR2/3 system mediates BMM motility by PTX-PI3K-Rac1 signaling pathway, which provid...Continue Reading

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Citations

Jul 28, 2016·The American Journal of Pathology·Keisaku SatoGianfranco Alpini
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Methods Mentioned

BETA
PCR
GTPase
FACS
transfection
flow cytometry
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