Expression of caveolin-1 and PTEN in cardiac fibroblasts of normoxia and hypoxia groups. Cardiac fibroblasts of hypoxia groups were exposed to GENbag anaer for 12, 24 and 48 hours. Hypoxia versus normoxia, *P<0.05, **P<0.005. (A) Western blotting; (B) expression of Caveolin-1, P=0.0019<0.005; (C) expression of PTEN, P=0.006<0.05. Data are representative of three separate experiments. PTEN, phosphatase and tensin homolog.