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Regulation of ENaC-mediated alveolar fluid clearance by insulin via PI3K/Akt pathway in LPS-induced acute lung injury

Respiratory research, 2012-03, Vol.13 (31), p.29-29, Article 29 [Peer Reviewed Journal]

COPYRIGHT 2012 BioMed Central Ltd. ;2012 Deng et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ;Copyright ©2012 Deng et al; licensee BioMed Central Ltd. 2012 Deng et al; licensee BioMed Central Ltd. ;ISSN: 1465-993X ;ISSN: 1465-9921 ;EISSN: 1465-993X ;DOI: 10.1186/1465-9921-13-29 ;PMID: 22458687

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Title:
Regulation of ENaC-mediated alveolar fluid clearance by insulin via PI3K/Akt pathway in LPS-induced acute lung injury
Author: Deng, Wang ; Li, Chang-Yi ; Tong, Jin ; Zhang, Wei ; Wang, Dao-Xin
Subjects: Acute lung injury ; Acute Lung Injury - chemically induced ; Acute Lung Injury - metabolism ; Acute Lung Injury - pathology ; Adult respiratory distress syndrome ; Akt ; Alveolar fluid clearance ; Analysis ; Animals ; Blood Glucose - metabolism ; Cells, Cultured ; DNA polymerases ; Endosomal Sorting Complexes Required for Transport - metabolism ; Enzymes ; Epithelial sodium channel ; Epithelial Sodium Channels - metabolism ; Hyperglycemia ; In Vitro Techniques ; Insulin ; Insulin - blood ; Insulin - pharmacology ; Interleukin-6 - metabolism ; Kinases ; Lipopolysaccharides - adverse effects ; Male ; Models, Animal ; Nedd4 Ubiquitin Protein Ligases ; Peroxidase - metabolism ; Phosphatidylinositol 3-kinase ; Phosphatidylinositol 3-Kinases - metabolism ; Proto-Oncogene Proteins c-akt - metabolism ; Pulmonary Alveoli - metabolism ; Pulmonary Alveoli - pathology ; Rats ; Rats, Sprague-Dawley ; Respiratory distress syndrome ; Rodents ; Signal Transduction - drug effects ; Signal Transduction - physiology ; Tumor Necrosis Factor-alpha - metabolism ; Ubiquitin-Protein Ligases - metabolism
Is Part Of: Respiratory research, 2012-03, Vol.13 (31), p.29-29, Article 29
Description: Stimulation of epithelial sodium channel (ENaC) increases Na(+) transport, a driving force of alveolar fluid clearance (AFC) to keep alveolar spaces free of edema fluid that is beneficial for acute lung injury (ALI). It is well recognized that regulation of ENaC by insulin via PI3K pathway, but the mechanism of this signaling pathway to regulate AFC and ENaC in ALI remains unclear. The aim of this study was to investigate the effect of insulin on AFC in ALI and clarify the pathway in which insulin regulates the expression of ENaC in vitro and in vivo. A model of ALI (LPS at a dose of 5.0 mg/kg) with non-hyperglycemia was established in Sprague-Dawley rats receiving continuous exogenous insulin by micro-osmotic pumps and wortmannin. The lungs were isolated for measurement of bronchoalveolar lavage fluid(BALF), total lung water content(TLW), and AFC after ALI for 8 hours. Alveolar epithelial type II cells were pre-incubated with LY294002, Akt inhibitor and SGK1 inhibitor 30 minutes before insulin treatment for 2 hours. The expressions of α-,β-, and γ-ENaC were detected by immunocytochemistry, reverse transcriptase polymerase chain reaction (RT-PCR) and western blotting. In vivo, insulin decreased TLW, enchanced AFC, increased the expressions of α-,β-, and γ-ENaC and the level of phosphorylated Akt, attenuated lung injury and improved the survival rate in LPS-induced ALI, the effects of which were blocked by wortmannin. Amiloride, a sodium channel inhibitor, significantly reduced insulin-induced increase in AFC. In vitro, insulin increased the expressions of α-,β-, and γ-ENaC as well as the level of phosphorylated Akt but LY294002 and Akt inhibitor significantly prevented insulin-induced increase in the expression of ENaC and the level of phosphorylated Akt respectively. Immunoprecipitation studies showed that levels of Nedd4-2 binding to ENaC were decreased by insulin via PI3K/Akt pathway. Our study demonstrated that insulin alleviated pulmonary edema and enhanced AFC by increasing the expression of ENaC that dependent upon PI3K/Akt pathway by inhibition of Nedd4-2.
Publisher: England: BioMed Central Ltd
Language: English
Identifier: ISSN: 1465-993X
ISSN: 1465-9921
EISSN: 1465-993X
DOI: 10.1186/1465-9921-13-29
PMID: 22458687
Source: SpringerOpen
Geneva Foundation Free Medical Journals at publisher websites
MEDLINE
PubMed Central
ProQuest Central
DOAJ Directory of Open Access Journals

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Regulation of ENaC-mediated alveolar fluid clearance by insulin via PI3K/Akt pathway in LPS-induced acute lung injury

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