Premium
CuZn‐SOD suppresses the bovine papillomavirus‐induced proliferation of fibroblasts
Author(s) -
RAUSALU KAI,
KAROASTOVER LIIS,
KILK ANN,
USTAV MART
Publication year - 2007
Publication title -
apmis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0903-4641
DOI - 10.1111/j.1600-0463.2007.00779.x
Subject(s) - bovine papillomavirus , cell growth , transfection , superoxide dismutase , cell culture , microbiology and biotechnology , cell , reactive oxygen species , cell cycle , biology , chemistry , oxidative stress , biochemistry , gene , genetics , genome
Eukaryotic cells continuously produce reactive oxygen species (ROS) and have mechanisms to control ROS levels. ROS have been shown to mediate cell proliferation and transformation. We studied the effect of CuZn‐superoxide dismutase (CuZnSOD) on the focus‐forming ability of bovine papillomavirus (BPV‐1) wtDNA and hypertransforming mutant of its major oncoprotein E5, E5–17S. We found that CuZnSOD suppresses the focus‐forming ability of BPV‐1 wtDNA and E5 oncoprotein. Significantly fewer foci were detected in pCGCuZnSOD‐ and BPV‐1 DNA‐cotransfected cell culture compare to BPV‐1 DNA‐transfected cell culture (p<0.001). CuZnSOD decreases the rate of cell proliferation in both non‐transformed C127 and BPV‐1‐ and E5‐transformed cell lines. CuZnSOD decelerates cell entry into the S phase of the cell cycle and has a suppressing effect on the actively dividing cells. As the transformed cells proliferate faster than normal cells when confluent, CuZnSOD inhibits the growth of foci. These results indicate that superoxide radicals may be involved in signaling for cell proliferation and that SOD suppresses cell proliferation.