Interleukin 4 signals through two related pathways Academic Article Article uri icon

Overview

MeSH Major

  • Arthritis, Rheumatoid
  • Interleukin-17
  • Lupus Erythematosus, Systemic
  • Signal Transduction
  • T-Lymphocyte Subsets

abstract

  • The interleukin 4 (IL-4) signaling pathway involves activation, by tyrosine phosphorylation, of two distinct substrates, a signal-transducing factor (STF-IL4) and the IL-4-induced phosphotyrosine substrate (4PS). It is not known whether the IL-4-mediated activation of these substrates occurs via related or distinct signaling pathways. We report that 32D cells, an IL-3-dependent myeloid progenitor cell line in which no phosphorylated 4PS is found, activate high levels of STF-IL4 in response to IL-4. Consistent with the known requirement for 4PS or insulin receptor substrate 1 (IRS-1) in IL-4-mediated mitogenesis, activation of STF-IL4 in 32D cells is not sufficient for IL-4-inducible c-myc expression. In addition, we have examined the ability of 32D cells transfected with different truncation mutants of the human IL-4 receptor to activate Jak-3 kinase and STF-IL4 in response to human IL-4. As in the case of 4PS/IRS-1, we have found that activation of both Jak-3 and STF-IL4 requires the presence of the IL-4 receptor region comprising aa 437-557. The finding that the same region of the IL-4 receptor is required for the induction of both 4PS/IRS-1 and STF-IL4 suggests that the IL-4-stimulated activation of these two substrates might involve common factors.

publication date

  • August 15, 1995

Research

keywords

  • Academic Article

Identity

Digital Object Identifier (DOI)

  • 10.1073/pnas.92.17.7971

PubMed ID

  • 7544011

Additional Document Info

start page

  • 7971

end page

  • 5

volume

  • 92

number

  • 17