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- Title
Lentivirus-mediated angiopoietin-2 gene silencing decreases TNF-α induced apoptosis of alveolar epithelium cells.
- Authors
Sun, Nan-Nan; Li, Chong; Zhou, Lei; Peng, Yan; Zhang, Bin; Qiu, Xian-Ming; Jiang, Zhi-Ming; Xu, Jiang
- Abstract
Objective: To investigate the role of angiopoietin-2 (Ang-2) in tumor necrosis factor-α (TNF-α) induced apoptosis of alveolar epithelium cells (AECs). Methods: TNF-α was used to induce human alveolar epithelial HPAEpiC cells, and Ang-2 siRNA vector was transfected to the HPAEpiC cells. RT-PCR and Western blot were used. TUNEL staining was applied to observe apoptosis, and annexin V-FITC-PI staining was used to calculate apoptosis rate. Results: mRNA and protein expressions of Ang-2, activated Bax, and cleaved caspase-3 in HPAEpiC cells were up-regulated, but the expression level of Bcl-2 decreased ( P < 0.05). After transfection of Ang-2 siRNA, mRNA and protein expressions of Ang-2, activated Bax, and cleaved caspase-3 in HPAEpiC cells were down-regulated, but the expression level of Bcl-2 increased ( P < 0.05). The number of apoptotic cells increased after TNF-α treatment; however, the number decreased after Ang-2 siRNA transfection. Annexin V-FITC-PI staining verified that the total number of apoptotic cells was elevated with TNF-α treatment, but declined after transfection of Ang-2 siRNA. Conclusions: The expression level of Ang-2 increased during TNF-α-induced apoptosis. Inhibiting Ang-2 expression may suppress the early stages of cell apoptosis and the degree of TNF-α-induced apoptosis.
- Subjects
ANGIOPOIETIN-2; TUMOR necrosis factors; APOPTOSIS; EPITHELIAL cells; GENE silencing; LENTIVIRUSES; CELL physiology
- Publication
Biochemistry & Cell Biology, 2016, Vol 94, Issue 5, p491
- ISSN
0829-8211
- Publication type
Article
- DOI
10.1139/bcb-2016-0045