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. 1972 Jun 1;135(6):1392–1405. doi: 10.1084/jem.135.6.1392

CELL SURFACE IMMUNOGLOBULIN

III. ISOLATION AND CHARACTERIZATION OF IMMUNOGLOBULIN FROM NONSECRETORY HUMAN LYMPHOID CELLS

Charles J Sherr 1, Sonia Baur 1, Inge Grundke 1, Joseph Zeligs 1, Barbara Zeligs 1, Jonathan W Uhr 1
PMCID: PMC2139180  PMID: 5025439

Abstract

Cells from an established line of Burkitt lymphoma (Daudi) were enzymatically radioiodinated, and labeled Ig from the cell surface was isolated and studied. Subcellular fractionation of labeled cells confirmed that intracellular proteins from the cytoplasm are not iodinated by this method. Radioactive Ig was identified as monomeric (8S) IgM, and an average of 105 Ig molecules was found per cell. Ig molecules could be released from the plasma membrane by detergent lysis under nonreducing conditions indicating that attachment of Ig to the plasma membrane occurs via noncovalent interactions. The ratio of µ/L radioactivity in surface Ig was the same as that of total cellular Ig radioiodinated in solution suggesting that a large portion of the Fc fragment is not buried within the membrane. In contrast to the results obtained with cell surface Ig, most intracellular Ig was found as "free" µ- and L chains regardless of whether lysates were labeled with 125I or cells were labeled with leucine-3H. The results indicate that only a small percentage of the total Ig of Daudi cells is associated with the cell surface and suggest that covalent assembly of Ig occurs at or near the time that the molecule becomes part of the plasma membrane. Similarities between cell surface Ig on normal splenic lymphocytes and Daudi cells suggest that the latter is a neoplasm of bone marrow-derived lymphocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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