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Effect of tumor suppressor PTEN gene on apoptosis and cell cycle of human airway smooth muscle cells.
MedLine Citation:
PMID:  23275086     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
It is well established that hyperplasia and decreased apoptosis of airway smooth muscle cells (ASMCs) play an important role in the asthmatic airway remodeling. Tumor suppressor PTEN gene with phosphatase activity plays an important regulatory role in embryonic development, cell proliferation, and apoptosis, cell cycle regulation, migration (invasion) of the cytoskeleton. We hypotheses that PTEN gene could affect the growth and viability of ASMCs through the regulation of PI3K/Akt, MAPK, and cell cycle-related gene expression. We constructed a recombinant adenovirus to transfect ASMCs. Cells were divided into the overexpression of PTEN gene group (Ad-PTEN-GFP), negative control group (Ad-GFP), and blank control group (DMEM). The cell apoptosis of ASMCs were evaluated by Hoechst-33342 staining and PE-7AAD double-labeled flow cytometry. The cell cycle distribution was observed by flow cytometry with PI staining. The expression of PTEN, p-Akt, total-Akt, p-ERK1/2, total-ERK1/2, cleaved-Caspases-3, Caspases-9, p21, and Cyclin D1 were tested by the Western blotting. Our study revealed that overexpression of PTEN gene did not induce apoptosis of human ASMCs cultured in vitro. However, overexpression of PTEN inhibited proliferation of human ASMCs cultured in vitro and was associated with downregulation of Akt phosphorylation levels, while did not affect ERK1/2 phosphorylation levels. Moreover, overexpression of PTEN could induce ASMCs arrested in the G0/G1 phase through the downregulation of Cyclin D1 and upregulation of p21 expressions.
Authors:
Liang Luo; Yuan Qi Gong; Xiefei Qi; Wenyan Lai; Haibing Lan; Yaling Luo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-29
Journal Detail:
Title:  Molecular and cellular biochemistry     Volume:  -     ISSN:  1573-4919     ISO Abbreviation:  Mol. Cell. Biochem.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0364456     Medline TA:  Mol Cell Biochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Medical Intensive Care Unit, The First Affiliated Hospital of Sun Yat-sen University, No. 58, Zhong Shan Er Road, Guangzhou, People's Republic of China.
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