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Bivalent ligand UDCA-LPE inhibits pro-fibrogenic integrin signalling by inducing lipid raft-mediated internalization

Ursodeoxycholyl lysophosphatidylethanolamide (UDCA-LPE) is a synthetic bile acid-phospholipid conjugate with profound hepatoprotective and anti-fibrogenic functions in vitro and in vivo. Herein, we aimed to demonstrate the inhibitory effects of UDCA-LPE on pro-fibrogenic integrin signalling. UDCA-LP...

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Main Authors: Su, Jie (Author) , Gan-Schreier, Hongying (Author) , Goeppert, Benjamin (Author) , Chamulitrat, Walee (Author) , Stremmel, Wolfgang (Author) , Pathil-Warth, Anita (Author)
Format: Article (Journal)
Language:English
Published: 20 October 2018
In: International journal of molecular sciences
Year: 2018, Volume: 19, Issue: 10, Pages: 1-15
ISSN:1422-0067
DOI:10.3390/ijms19103254
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3390/ijms19103254
Verlag, kostenfrei, Volltext: https://www.mdpi.com/1422-0067/19/10/3254
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Author Notes:Jie Su, Hongying Gan-Schreier, Benjamin Goeppert, Walee Chamulitrat, Wolfgang Stremmel and Anita Pathil
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Summary:Ursodeoxycholyl lysophosphatidylethanolamide (UDCA-LPE) is a synthetic bile acid-phospholipid conjugate with profound hepatoprotective and anti-fibrogenic functions in vitro and in vivo. Herein, we aimed to demonstrate the inhibitory effects of UDCA-LPE on pro-fibrogenic integrin signalling. UDCA-LPE treatment of human embryonic liver cell line CL48 and primary human hepatic stellate cells induced a non-classical internalization of integrin β1 resulting in dephosphorylation and inhibition of SRC and focal adhesion kinase (FAK). Signalling analyses suggested that UDCA-LPE may act as a heterobivalent ligand for integrins and lysophospholipid receptor1 (LPAR1) and co-immunoprecipitation demonstrated the bridging effect of UDCA-LPE on integrin β1 and LPAR1. The disruption of either the UDCA-moiety binding to integrins by RGD-containing peptide GRGDSP or the LPE-moiety binding to LPAR1 by LPAR1 antagonist Ki16425 reversed inhibitory functions of UDCA-LPE. The lack of inhibitory functions of UDCA-PE and UDCA-LPE derivatives (14:0 and 12:0, LPE-moiety containing shorter fatty acid chain) as well as the consistency of the translocation of UDCA-LPE and integrins, which co-fractionated with LPE but not UDCA, suggested that the observed UDCA-LPE-induced translocation of integrins was mediated by LPE endocytic transport pathway.
Physical Description:Online Resource
ISSN:1422-0067
DOI:10.3390/ijms19103254

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