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IL-7 reconstitutes multiple aspects of v-Abl-mediated signaling

A Banerjee1, P Rothman

  • 1Integrated Program in Cellular, Molecular, and Biophysical Studies, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 30, 1998
PubMed

Insights

Interleukin-7 (IL-7) signaling delays apoptosis and cell cycle arrest in v-Abl transformed cells, suggesting a role in Abelson murine leukemia virus transformation. However, IL-7 cannot replace v-Abl kinase activity for full transformation.

Area of Science:

  • Oncology
  • Virology
  • Immunology

Background:

  • v-Abl oncoprotein transforms early lymphoid cells, activating IL-4 and IL-7 signaling pathways.
  • Constitutive activation of Janus protein kinase (JAK)1, JAK3, STAT5, and STAT6 is observed in v-Abl transformed pre-B cells.

Purpose of the Study:

  • To investigate the role of IL-4 and IL-7 signaling pathways in v-Abl-induced cellular events.
  • To determine if these cytokine pathways are essential for Abelson murine leukemia virus transformation.

Main Methods:

  • Examined the effects of IL-4 and IL-7 on pre-B cells transformed with a temperature-sensitive v-Abl mutant.
  • Assessed apoptosis, cell cycle arrest, c-Myc, Bcl-2, Bcl-xL levels, NF-kappaB activation, and RAG gene transcription.

Main Results:

  • IL-7, but not IL-4, delayed apoptosis and cell cycle arrest upon v-Abl kinase inactivation.
  • IL-7 also delayed the reduction of c-Myc, Bcl-2, and Bcl-xL levels following loss of v-Abl kinase activity.
  • IL-7 did not affect NF-kappaB activation or RAG gene transcription, indicating it doesn't maintain differentiation arrest.

Conclusions:

  • IL-7 signaling pathways play a potential role in v-Abl-mediated transformation.
  • IL-4 and IL-7 signaling cannot substitute for active v-Abl kinase in transformed pre-B cells.

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