Overexpression of Hsp70 confers cytoprotection during gliadin exposure in Caco-2 cells.

Abstract:

BACKGROUND:In Celiac disease (CD), cytoskeletal integrity of intestinal cells is disrupted by gliadin exposure. This study investigates the role of heat shock protein (Hsp)70 during cytoskeletal recovery in CD by assessing its induction and effects on junctional proteins. METHODS:Using an in-vitro model of CD, cytoskeletal injury and recovery was assessed in gliadin-exposed Caco-2 cells by measuring cellular distribution of ezrin, E-cadherin, and Hsp70 by differential centrifugation. Effects of Hsp70 were tested by an in-vitro repair assay, based on the incubation of injured or recovered cytoskeletal cellular fractions in noncytoskeletal supernatants containing low or high levels of Hsp70, or by transient transfection of Caco-2 cells with Hsp70. RESULTS:Cytoskeletal disruption of ezrin and E-cadherin was demonstrated in gliadin-exposed Caco-2 cells by their significant shift from the cytoskeletal pellet into the noncytoskeletal supernatant fraction. Recovery from gliadin exposure was associated with induction and cytoskeletal redistribution of Hsp70. The in-vitro repair assay delineated direct evidence for HSP-mediated repair by stabilization of junctional proteins by Hsp70. Overexpression of Hsp70 resulted in significantly increased cytoskeletal integrity. CONCLUSION:Our results establish an essential role of HSP-mediated cytoskeletal repair in Caco-2 cells during recovery from in-vitro gliadin exposure.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Bidmon-Fliegenschnee B,Lederhuber HCh,Csaicsich D,Pichler J,Herzog R,Memaran-Dadgar N,Huber WD,Aufricht C,Kratochwill K

doi

10.1038/pr.2015.112

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

358-64

issue

4

eissn

0031-3998

issn

1530-0447

pii

pr2015112

journal_volume

78

pub_type

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