A phosphatidylcholine phospholipase C inhibitor, D609, blocks interleukin-3 (IL-3)-induced bcl-2 expression but not

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Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
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Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence

Published on: January 7, 2019

R A Mufson1, E Gubina, M Rinaudo

  • 1Holland Laboratory for Biomedical Science, American Red Cross, Rockville, Maryland 20855, USA.

Experimental Cell Research
|May 23, 1998
PubMed

Insights

Interleukin-3 (IL-3) receptor activation involves distinct pathways. Phosphatidylcholine hydrolysis specifically regulates cell survival genes like bcl-2, while tyrosine kinases impact both proliferation and survival.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Hematopoiesis

Background:

  • Interleukin-3 (IL-3) receptor activation is crucial for hematopoietic progenitor cell proliferation and survival.
  • IL-3 signaling involves rapid tyrosine kinase and phosphatidylcholine-specific phospholipase C activation.
  • The precise signal transduction pathways for IL-3-mediated proliferation and apoptosis suppression remain unclear.

Purpose of the Study:

  • To investigate the roles of tyrosine kinases and phosphatidylcholine-specific phospholipase C in IL-3 signaling.
  • To elucidate the specific genes regulated by these pathways in IL-3-dependent cells.
  • To explore the hypothesis of bifurcating signaling pathways downstream of the IL-3 receptor.

Main Methods:

  • Utilized human IL-3-dependent TF-1 cells.
  • Employed genistein, a tyrosine kinase inhibitor.
  • Used D609, a specific inhibitor of phosphatidylcholine-specific phospholipase C.

Main Results:

  • Genistein inhibited IL-3-induced apoptosis suppression and the expression of bcl-2 and c-myc genes.
  • D609 inhibited IL-3-induced bcl-2 expression but not tyrosine phosphorylation, and induced apoptosis.
  • Phosphatidylcholine hydrolysis is specifically linked to the induction of cell survival genes like bcl-2.

Conclusions:

  • IL-3 signaling pathways diverge downstream of receptor-induced tyrosine phosphorylation.
  • Phosphatidylcholine hydrolysis is a key mediator for IL-3's anti-apoptotic effects via bcl-2.
  • Tyrosine kinases regulate both IL-3-induced proliferation (c-myc) and survival (bcl-2).

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