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MITOGEN PLUS INTERLEUKIN 4 INDUCTION OF Cs TRANSCRIPTS IN B LYMPHOID CELLS

The Ig H chain locus contains multiple C region genes that encode different effector functions; the order of these genes from 5' to 3' is lt, S, y3, yl, y2b, y2a, s, and a (1). Recombination events between sets of repetitive elements located upstream of each C region gene (switch regions) can replace the w gene with a downstream C region gene (termed HC class or isotype switching), and thereby allow an antibody of given specificity (variable region) to change constant region effector function (for review see reference 2). As a test of this hypothesis, we have examined the effects of LPS and IL-4 on Cs and Cyl gene expression in B lineage cells. The 18-81A20 (A20) Abelson murine leukemia virus (A-MuLV)-transformed cell line is a subclone of the 18-81 line. The A20 line produces R H chains (12). WCPR8 was derived by preculturing BALB/c mousebone marrow with IL-4 (150 U/ml) for 12 h before infection with A-MuLV Viral infections, propagation of cells, and LPS or IL-4 treat-This