The FASEB Journal, Vol 2, 3087-3091, Copyright © 1988 by The Federation of American Societies for Experimental Biology

RESEARCH COMMUNICATIONS

Induction of mitochondrial manganese superoxide dismutase by interleukin 1

A Masuda, DL Longo, Y Kobayashi, E Appella, JJ Oppenheim and K Matsushima
Division of Cancer Treatment, National Cancer Institute, Frederick Cancer Research Facility, Maryland 21701.

Interleukin 1 (IL 1) inhibits the growth of human melanoma A375 cells. To identify the subcellular events preceding inhibition of growth by IL 1, we have examined the effect of IL 1 on protein synthesis caused by A375 cells. IL 1 selectively and predominantly induced a 25-kDa polypeptide (p25) in A375 cells after 12 h. On subcellular fractionation, p25 was exclusively located in the 10,000 x g-pelleted (mitochondria-enriched) fraction. To identify the p25 moiety, it was purified to homogeneity by sequential chromatography on DEAE-Sephacel and reverse-phase, high-pressure liquid chromatography and its amino- terminal amino acid sequence was determined. The sequence of the 35 amino-terminal amino acids of the p25 moiety was identical to that of human manganese superoxide dismutase (Mn SOD). The enzymatic activities of SOD were induced only in the mitochondria-enriched fraction of IL 1- treated A375 cells. However, IL 1 also induced Mn SOD in normal human skin fibroblasts and peripheral blood mononuclear cells, whose growth was stimulated by IL 1. The results show that induction of Mn SOD by IL 1 is a common biochemical event in IL 1-responsive cells.

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