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Stat5: an essential regulator of mast cell biology
Christopher P Shelburne1, Margaret E McCoy, Roland Piekorz
1Department of Biology, Virginia Commonwealth University, Richmond, VA 23284-2012, USA. jjryan@saturn.vcu.edu
Abstract:
Interleukin-3 (IL-3) and stem cell factor (SCF) are important mast cell growth and differentiation factors. Since both cytokines activate the transcription factor Stat5, a known regulator of proliferation and survival, we investigated the effects of Stat5 deficiency on mast cell development and survival. This article will review data presented at The Fourth International Workshop on Signal Transduction in the Activation and Development of Mast Cells and Basophils. The full set of data is now in preparation for publication. We find that the absence of Stat5 A and B results in a total loss of in vivo mast cell development. Bone marrow-derived mast cell (BMMC) populations can be cultured and maintained from Stat5-deficient mice in IL-3+SCF, but not in either cytokine alone. The absence of Stat5 resulted in aberrant control of Bcl-2, Bcl-x(L) and cyclin A2, with increased apoptosis and delayed cell cycle progression after IL-3 or SCF stimulation. These results indicate that Stat5 A and B are critical regulators of in vitro and in vivo mast cell biology.
Insights
Stat5 transcription factors are essential for mast cell development and survival. Their absence causes a complete loss of in vivo mast cell development and aberrant in vitro mast cell responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Interleukin-3 (IL-3) and stem cell factor (SCF) are key cytokines for mast cell growth and differentiation.
- Stat5 is a transcription factor activated by IL-3 and SCF, regulating cell proliferation and survival.
Purpose of the Study:
- To investigate the role of Stat5 transcription factors in mast cell development and survival.
- To analyze the effects of Stat5 deficiency on mast cell biology in vitro and in vivo.
Main Methods:
- Studied mast cell development and survival in Stat5-deficient mice.
- Cultured bone marrow-derived mast cells (BMMC) from Stat5-deficient mice with IL-3 and SCF.
- Analyzed the expression of Bcl-2, Bcl-x(L), and cyclin A2, and assessed apoptosis and cell cycle progression.
Main Results:
- Stat5 A and B deficiency resulted in a complete loss of in vivo mast cell development.
- BMMC from Stat5-deficient mice could be cultured with IL-3+SCF but not with either cytokine alone.
- Stat5 absence led to aberrant control of Bcl-2, Bcl-x(L), and cyclin A2, increased apoptosis, and delayed cell cycle progression.
Conclusions:
- Stat5 A and B are critical regulators of both in vitro and in vivo mast cell biology.
- Stat5 is indispensable for normal mast cell development, proliferation, and survival.