Inhibition of Cell Growth by Overexpression of Manganese Superoxide Dismutase (MnSOD) in Human Pancreatic Carcinoma

Free Radic Res. 2004 Nov;38(11):1223-33. doi: 10.1080/10715760400017376.


Manganese superoxide dismutase (MnSOD) levels have been found to be low in human pancreatic cancer [Pancreas 26, (2003), 23] and human pancreatic cancer cell lines [Cancer Res. 63, (2003), 1297] when compared to normal human pancreas. We hypothesized that stable overexpression of pancreatic cancer cells with MnSOD cDNA would alter the malignant phenotype. MIA PaCa-2 cells were stably transfected with a pcDNA3 plasmid containing sense human MnSOD cDNA or containing no MnSOD insert by using the lipofectAMINE method. G418-resistant colonies were isolated, grown and maintained. Overexpression of MnSOD was confirmed in two selected clones with a 2-4-fold increase in MnSOD immunoreactive protein. Compared with the parental and neo control cells, the MnSOD-overexpressing clones had decreased growth rates, growth in soft agar and plating efficiency in vitro, while in vivo, the MnSOD-overexpressing clones had slower growth in nude mice. These results suggest that MnSOD may be a tumor suppressor gene in human pancreatic cancer.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Agar
  • Aged
  • Animals
  • Antioxidants / metabolism
  • Cell Proliferation
  • Cells, Cultured
  • DNA, Complementary / genetics
  • Dicumarol / pharmacology
  • Gene Expression / radiation effects
  • Humans
  • Male
  • Mice
  • Mice, Nude
  • Neoplasm Transplantation
  • Pancreatic Neoplasms / enzymology*
  • Pancreatic Neoplasms / genetics
  • Pancreatic Neoplasms / pathology*
  • Superoxide Dismutase / genetics*
  • Superoxide Dismutase / metabolism*
  • Superoxides / metabolism
  • Transfection


  • Antioxidants
  • DNA, Complementary
  • Superoxides
  • Dicumarol
  • Agar
  • Superoxide Dismutase