Effects of PKCα/c-fos, Bax/Bcl-2 expression on the proliferation and apoptosis of rat pulmonary arterial smooth muscle cells in hypoxia

Abstract

To explore the effects of PKCα/c-fos, Bax/Bcl-2 on the proliferation and apoptosis of rat pulmonary arterial smooth musclecells(PASMCs) in hypoxia. The PASMCs of rats had been isolated and cultured, and then were cultured under normoxia (5%CO2、21%O2、74%N2)and hypoxia(5%CO2,2% O2,93%N2)condition for 24 h and 48 h, respectively. The proliferation of PASMCs was tested by methylthiazolyltetrazolium (MTT). The changes of PASMCs apoptosis were detected by Annexin V-FITC/PI staining combined flow cytometry. RT-PCR and Western blot analysis were performed to detect the gene and protein levels of PKCα/c-fos, Bax/Bcl-2, respectively. All experiments were repeated three times with at least triplicate samples. The proliferation of PASMCs in hypoxia group were stronger than that of normoxia group after 24 h and 48 h (P < 0.01), while the apoptosis rate did not change significantly. Meanwhile, the higher levels of PKCα, c-fos, Bcl-2 mRNA and proteins after hypoxia for 24 h and 48 h were detected by RT-PCR and Western blot analysis, while the ex-pression levels of Bax had no significant difference under normoxic and hypoxic conditions. Elevated proliferation and expression of PKCα, c-fos, Bcl-2 was observed in rat PASMCs in hypoxia, and while the apoptosis rate had no significant change.