PMID: 16786109Jun 21, 2006Paper

Cigarette smoke extract inhibits the proliferation of alveolar epithelial cells and induces apoptosis

Sheng li xue bao : [Acta physiologica Sinica]
Z JiaoM Xiong


Cigarette smoke extract (CSE) contains abundant oxidants and free radicals. Oxidative stress caused by cigarette smoking results in the destruction of the alveolar cell walls and emphysema. However, there exists discrepancy about how CSE works in the process. In the present study, we observed the effect of CSE on the cell growth of type II alveolar epithelial cell-derived A549 cell line, and provided molecular understanding of this effect. The MTT assay results showed that CSE decreased the cell viability of A549 cells in a dose- and time-dependent manner, and cell cycle was arrested in G(1)/S phase. Furthermore, CSE-induced apoptosis of A549 cells was verified by Hoechst 33258 staining, electron microscopy in morphology, and the appearance of DNA fragmentation and annexin V-FITC/propidium iodide (PI) staining assay at molecular level. It was found that CSE treatment resulted in the upregulation of Fas/APO-1 receptor and activation of caspase-3. CSE also initiated accumulation of intracellular reactive oxygen species, which was detected by laser confocal microscopy. Taken together, CSE could inhibit the cell growth and induce apoptosis of A549 cells through Fas receptor pathway. Oxidative stress caused by CSE may be the radical...Continue Reading

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Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis