PMID: 2106874Feb 15, 1990Paper

Expression of extracellular superoxide dismutase by human cell lines

The Biochemical Journal
S L Marklund

Abstract

Extracellular superoxide dismutase (EC-SOD) is the major SOD isoenzyme in extracellular fluids, but occurs also in tissues. The sites and characteristics of the synthesis of the enzyme are unknown. The occurrence of EC-SOD in cultures of a large panel of human cell lines was assayed by means of an e.l.i.s.a. Unlike the situation for the intracellular isoenzymes CuZn-SOD and Mn-SOD, expression of EC-SOD occurs in only a few cell types. None of the ten investigated suspension-growing cell lines produced EC-SOD. Among normal diploid anchorage-dependent cell lines, expression was found in all 25 investigated fibroblast cell lines, in the two glia-cell lines, but not in six endothelial-cell lines, two epithelial-cell lines or in two amnion-derived lines. Among neoplastic anchorage-dependent cell lines expression was found in 13 out of 29. EC-SOD was secreted into the culture medium by cell lines expressing the enzyme. The rate of EC-SOD synthesis varied by nearly 100-fold among the fibroblast lines and remained essentially constant in the individual lines during long-term culture. In the nine investigated cases, the secreted EC-SOD was of the high-heparin-affinity C type. It is suggested that tissue EC-SOD is secreted by a few well-...Continue Reading

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