| Activation of the heat shock response attenuates the interleukin 1β-mediated inhibition of the amiloride-sensitive alveolar epithelial ion transport. | |
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MedLine Citation:
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PMID: 23324889 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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ABSTRACT: Acute lung injury (ALI) is a clinical syndrome characterized by hypoxia, which is caused by the breakdown of the alveolar capillary barrier. Interleukin 1β (IL-1β), a cytokine released within the airspace in ALI, downregulates the α subunit of the epithelial sodium channel (αENaC) transcription and protein expression via p38 MAP kinase-dependent signaling. Although induction of the heat shock response can restore alveolar fluid clearance compromised by IL-1β following the onset of severe hemorrhagic shock in rats, the mechanisms are not fully understood. In this study, we report that the induction of the heat shock response prevents IL-1β-dependent inhibition of αENaC mRNA expression and subsequent channel function. Heat shock results in IRAK1 detergent insolubility and a disruption of Hsp90 binding to IRAK1. Likewise, TAK1, another client protein of Hsp90 and signaling component of the IL-1β pathway, is also detergent insoluble after heat shock. Twenty-four hours after heat shock, both IRAK1 and TAK1 are again detergent soluble, which correlates with the IL-1β-dependent p38 activation. Remarkably, IL-1β-dependent p38 activation 24 h after heat shock did not result in an inhibition of αENaC mRNA expression and channel function. Further analysis demonstrates prolonged preservation of αENaC expression by the activation of the heat shock response that involves inducible Hsp70. Inhibition of Hsp70 at 24 h after heat shock results in p38-dependent IL-1β inhibition of αENaC mRNA expression, whereas overexpression of Hsp70 attenuates the p38-dependent IL-1β inhibition of αENaC mRNA expression. These studies demonstrate new mechanisms by which the induction of the heat shock response protects the barrier function of the alveolar epithelium in ALI. |
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Authors:
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Marybeth Howard; Jérémie Roux; Karen E Iles; Byron Miyazawa; Sarah Christiaans; Naseem Anjum; Dale A Dickinson; Arnaud Goolaerts; Michael A Matthay; Jean Francois Pittet |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Shock (Augusta, Ga.) Volume: 39 ISSN: 1540-0514 ISO Abbreviation: Shock Publication Date: 2013 Feb |
Date Detail:
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Created Date: 2013-01-17 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9421564 Medline TA: Shock Country: United States |
Other Details:
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Languages: eng Pagination: 189-96 Citation Subset: IM |
Affiliation:
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Laboratory of Surgical Research, Departments of *Anesthesia, †Surgery, ‡Medicine, and §Cardiovascular Research Institute, University of California, San Francisco, California; and Departments of ∥Anesthesiology, ¶Nutrition, and **Environmental Health Sciences, University of Alabama at Birmingham, Birmingham, Alabama. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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