Document Detail

Claudin-5 levels are reduced from multiple cell types in human failing hearts and are associated with mislocalization of ephrin-B1.
MedLine Citation:
PMID:  25440958     Owner:  NLM     Status:  Publisher    
Claudin-5 is transcriptionally downregulated resulting in dramatically reduced protein levels in human heart failure. Studies in mice have demonstrated that reduced claudin-5 levels occur prior to cardiac damage and far before reduced whole heart function. Therefore, claudin-5 may be a useful early therapeutic target for human heart failure. However, the cell types in which claudin-5 is localized in human heart and from which claudin-5 is reduced in heart failure is not known. The recent identification of claudin-5's interaction with ephrin-B1 in mouse hearts has also not been investigated in non-failing or failing human hearts. In this study we collected human left ventricular mid-myocardium histological samples from 7 non-failing hearts and 16 end-stage failing hearts. Immunoblots demonstrate severe reductions of claudin-5 protein in 14 of 16 failing hearts compared to non-failing controls. Claudin-5 was observed to localize to cardiomyocytes, endothelial cells, and a subset of fibroblasts in non-failing human heart sections. In isolated cardiomyocytes, the transmembrane claudin-5 protein localized in longitudinal striations in lateral membranes. In failing heart, both cardiomyocyte and endothelial claudin-5 localization was severely reduced, but claudin-5 remained in fibroblasts. Absence of claudin-5 staining also correlated with the reduction of the endothelial cell marker CD31. Ephrin-B1 localization, but not protein levels, was altered in failing hearts supporting that claudin-5 is required for ephrin-B1 localization. These data support that loss of claudin-5 in cardiomyocytes and endothelial cells is prevalent in human heart failure. Investigating claudin-5/ephrin-B1 protein complexes and gene regulation may lead to novel therapies.
Sarah A Swager; Dawn A Delfín; Neha Rastogi; Honglan Wang; Benjamin D Canan; Vadim V Fedorov; Peter J Mohler; Ahmet Kilic; Robert S D Higgins; Mark T Ziolo; Paul M L Janssen; Jill A Rafael-Fortney
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-7
Journal Detail:
Title:  Cardiovascular pathology : the official journal of the Society for Cardiovascular Pathology     Volume:  -     ISSN:  1879-1336     ISO Abbreviation:  Cardiovasc. Pathol.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-12-2     Completed Date:  -     Revised Date:  2014-12-3    
Medline Journal Info:
Nlm Unique ID:  9212060     Medline TA:  Cardiovasc Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Inc. All rights reserved.
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