Direct identification of the murine IL-2 receptor p55-p75 heterodimer in the absence of IL-2

H. Saragovi, T. R. Malek

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The proteins cross-linked to the IL-2R p55 subunit were biochemically compared in distinct cell populations that varied in their capacity to express high affinity IL-2R. We directly cross-linked p75 to p55 in the absence of IL-2 for the cell populations that bear only high affinity IL-2R. Furthermore, although no endogenous Il-2 production was detected, p75 was readily cross-linked to p55 for EL4J-3.4, a p55 transfectant of EL4 that bears high affinity IL-2R. These results strongly suggest that high affinity IL-2R exist as a preformed heterodimer of p55 and p75 which do not require IL-2 for their association. Furthermore, cross-linking of three other proteins of apparent M(r) of 100,000, 135,000, and 180,000 to p55 was also seen, raising the possibility of a more complex subunit composition for the IL-2R.

Original languageEnglish (US)
Pages (from-to)476-482
Number of pages7
JournalJournal of Immunology
Volume141
Issue number2
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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