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Purified secondary cultures of mouse Schwann cells (less than 5% fibroblast contamination) have been obtained by taking advantage of the differential adhesion of Schwann cells and fibroblasts during trypsinization. The growth properties of the purified subcultures changed with time in culture. Cells passaged after 5 days in vitro (DIV) divided rapidly (doubling time 22 h), whereas cells that had been in vitro for longer periods progressively decreased their growth rate, becoming quiescent after 20 or more days. Schwann cells lacked the Thy 1.2 surface antigen, but were positively stained with antigalactocerebroside antibodies after prefixation. Biochemical analyses showed Schwann cells to be enriched in the activities of enzymes characteristic of the myelin-forming cells: 2'3'-cyclic nucleotide 3'-phosphodiesterase (CNP), cerebroside sulfotransferase (CST) and UDP-galactose: ceramide galactosyltransferase (CGalT).
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