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Proc Natl Acad Sci U S A. 1988 Sep;85(18):6934-8.

Functional and structural characterization of P40, a mouse glycoprotein with T-cell growth factor activity.

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  • 1Ludwig Institute for Cancer Research, Brussels Branch, Belgium.


Antigen-independent cell lines were derived from mouse helper T-cell clones by culture in autologous supernatant obtained after stimulation with concanavalin A. A factor, termed P40, supporting the growth of these lines was purified and characterized as a basic 32- to 39-kDa single-chain glycoprotein functionally distinct from previously identified T-cell growth factors and apparently unrelated structurally to any known protein. Of a number of cell lines, only helper T cells responded to P40, and this response was not mediated by either interleukin 2 or interleukin 4.

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