The kinase domain of Jak2 mediates induction of Bcl-2 and delays cell death in hematopoietic cells

Ikuya Sakai, Andrew Kraft

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin (IL)-3, and IL-5 stimulate DNA synthesis and proliferation and inhibit apoptosis in hematopoietic cells. Multiple signal pathways are activated by binding of these ligands to their receptors, which share a common β subunit. Janus protein kinase 2 (Jak2) binds to the membrane proximal domain of the β chain and is phosphorylated on receptor ligation. To explore the role of Jak2 in the regulation of specific signal transduction pathways, we constructed fusion proteins with a CD16 external domain, a CD7 transmembrane region, and a Jak2 cytoplasmic domain. This cytoplasmic domain consisted either of wild type Jak2 (CD16/Jak2-W) or Jak2 mutations with deletions of (a) the amino terminus (CD16/Jak2-N), (b) kinase-like domain (CD16/Jak2-B), (c) kinase domain (CD16/Jak2-C), or (d) amino-terminal and kinase-like domains, leaving the kinase domain (CD16/Jak-K) intact. In contrast to the CD16/Jak2-W fusion protein, which requires cross-linking for activation, CD16/Jak2-N, CD16/Jak2- B, and CDI6/Jak2-K were constitutively phosphorylated, and they stimulated Shc phosphorylation and increased binding of STAT to DNA in Ba/F3 cells. Cell lines derived from IL-3-dependent Ba/F3 cells stably transfected with CD16/Jak2-W, CD16/Jak2-N, or CD16/Jak2-B mammalian expression vectors died at a rate similar to that of the parental cells on IL-3 deprivation. In contrast, CD16/Jak2-K cell lines exhibited increased expression of bcl-2 and pim-1 mRNA and maintained their viability when compared with control cell lines. Thus, activation of tyrosine phosphorylation by creating a CD16/Jak2- K fusion is sufficient to activate pathways that prevent cell death.

Original languageEnglish (US)
Pages (from-to)12350-12358
Number of pages9
JournalJournal of Biological Chemistry
Volume272
Issue number19
DOIs
StatePublished - May 9 1997
Externally publishedYes

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Janus Kinase 2
Cell death
Protein Kinases
Cell Death
Phosphotransferases
Interleukin-3
Phosphorylation
Fusion reactions
Cells
Cell Line
Signal Transduction
Chemical activation
Signal transduction
Proto-Oncogene Proteins c-akt
Sequence Deletion
DNA
Interleukin-5

ASJC Scopus subject areas

  • Biochemistry

Cite this

The kinase domain of Jak2 mediates induction of Bcl-2 and delays cell death in hematopoietic cells. / Sakai, Ikuya; Kraft, Andrew.

In: Journal of Biological Chemistry, Vol. 272, No. 19, 09.05.1997, p. 12350-12358.

Research output: Contribution to journalArticle

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