Abstract
Studies investigating the relative rates of biosynthesis of mu- and delta-polypeptide chains in normal resting B lymphocytes have shown that the translation rate of mu m is about sevenfold higher than that of delta m, thus reflecting the relative abundance of mRNA encoding these two chains. The turnover rate of cell surface IgM is faster, however, than that of cell surface IgD, resulting in higher expression of cell surface IgD relative to IgM under steady state conditions. LPS stimulation of B lymphocytes induces the complete cessation of synthesis of the delta-chain, thus accounting for the gradual disappearance of IgD from the cell surface of activated cells.
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