Expression of novel interleukin 2 binding molecules and their functional roles in human B cell differentiation.

T Tanaka; O Saiki; S Doi; M Suemura; S Negoro; S Kishimoto

doi:10.1172/JCI113589

Third Department of Internal Medicine, Osaka University, Japan.

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Third Department of Internal Medicine, Osaka University, Japan.

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Third Department of Internal Medicine, Osaka University, Japan.

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Third Department of Internal Medicine, Osaka University, Japan.

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Third Department of Internal Medicine, Osaka University, Japan.

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Third Department of Internal Medicine, Osaka University, Japan.

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Published in Volume 82, Issue 1 on July 1, 1988
J Clin Invest. 1988;82(1):316–321. https://doi.org/10.1172/JCI113589.
© 1988 The American Society for Clinical Investigation

Published July 1, 1988 - Version history

Expressions and functional roles of novel IL-2 binding molecules (p70, 75) in the differentiation of B cells into Ig secreting cells were explored by using human several B cell lines and tonsillar B cells. Affinity-crosslinking studies revealed that five of nine B cell lines expressed p70 and p75 without detectable Tac antigen (p55) expression and the expression was associated with B cell maturation. In tonsillar B cells, small high-density B cells did not express p70 and p75, whereas large low-density B cells, which were thought to be activated in vivo, expressed them. Binding assays of radiolabeled IL-2 showed that the affinity of these molecules was intermediate (kD = 1-3 nM, 700-3,000 sites/cell). Furthermore, high concentrations of IL-2 (greater than 100 U/ml) induced Ig productions in large B cells and two of five cell lines. These results taken together suggest that B cells may express novel IL-2 binding molecules, associated with B cell differentiation and differentiate into Ig secreting cells by IL-2 through novel IL-2 binding molecules.

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