Synthesis, surface deposition, and secretion of immunoglobulins by Abelson virus-transformed lymphosarcoma cell lines - PubMed (original) (raw)
Synthesis, surface deposition, and secretion of immunoglobulins by Abelson virus-transformed lymphosarcoma cell lines
E Premkumar et al. Cell. 1975 Oct.
Abstract
Three Abelson virus-transformed lymphoma cell lines were established in tissue culture and the immunoglobulin biosynthesis by these cell lines was studied. Two of the cell lines (ABLS-1 and ABLS-5) were found to synthesize monomeric IgM molecules which were deposited in the cell membrane, probably to serve as an antigen receptor. The third cell line (ABLS-8) was found to synthesize membrane-associated IgM as well as cellular IgG molecules. In addition, these cell lines were found to synthesize a protein of 35,000 molecular weight which is also membrane-associated and which has the capability to bind the immunoglobulin (MAID). It is speculated that this protein might play a role in adapting the receptor immunoglobulin molecule to the hydrophobic environment of the cell membrane. The kinetics of amino acid incorporation into immunoglobulins by these cell lines show that they produce immunoglobulins at a rate which is two orders of magnitude smaller than plasmacytoma cells (MOPC 104E). These results suggest that Abelson virus transforms thymus-independent lymphocytes in various stages of maturation and these lymphocytes might be of B cell origin. The T lymphoma (P1798) used as a control cell line was found occasionally to produce minute amounts of immunoglobulin.
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