Abstract
A functionally rearranged human gamma 1 heavy-chain immunoglobulin gene was cloned from a human plasma cell leukemia cell line, ARH-77, into the phage lambda Charon 4A. The recombinant phage DNA was introduced into fertilized mouse eggs (about 200 copies of the human gene per egg). A total of 30 mice were born and were screened for the presence of the human gamma 1 gene by dot hybridization. Two of these 30 mice had integrated one or two copies of the gene. The gamma 1 mRNAs were detected only in spleen. Levels of gamma 1 mRNA and the percentage of spleen cells producing human gamma chain increased up to 50-fold after treatment with bacterial lipopolysaccharide (a B-cell mitogen) but not with concanavalin A (a T-cell mitogen), suggesting B-cell-specific and regulated expression of the human gamma 1 heavy-chain gene. Human gamma chain-producing cells were found only in the periphery of the germinal center of the white pulp in histological sections of the spleen but not in sections of other tissues. Human gamma chains appeared to be coupled with mouse light chains to form a complete IgG molecule and were secreted into the cell supernatant. The production and secretion of endogenous immunoglobulin heavy and light chains in transgenic mice appeared to be the same as in normal mice. About one-seventh of the spleen cells that produced endogenous mouse heavy chains also produced human gamma chains, but no cells that produced only human gamma chain were observed.
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