Interleukin-7 Receptor is Indispensable for Proliferation and Survival in Thymic ${\gamma}{\delta}$T Cell Development

  • Kim, Dong-Hyun (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Yoon, Byung-Hak (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Jung, Joo-Eun (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Kim, Hoog-Sook (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Ko, Seong-Hee (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Choi, Eun-Young (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Lee, Kwang-Ho (Bio-Food and Drug Research Center, and Department of Biotechnology, Faculty of Life Science, College of Natural Science, Konkuk University) ;
  • Kim, Kyung-Jae (Department of Pharmacy, Sahmyook University) ;
  • Ye, Sang-Kyu (Department of Pharmacology, Seoul National University College of Medicine) ;
  • Chung, Myung-Hee (Department of Pharmacology, Seoul National University College of Medicine)
  • Published : 2005.03.31

Abstract

Background: Interleukin-7 receptor (IL-7R) ${\alpha}$-deficient mice have small numbers of B cells and ${\alpha}{\beta}$T cells in periphery, they totally lack ${\gamma}{\delta}$T cells. In addition, the V-J recombination and transcription of TCR ${\gamma}$ genes is also severely impaired in IL-7R ${\alpha}$-deficient mice. Stat5, a signaling molecule of the IL-7R, induces germline transcription in the TCR ${\gamma}$ locus, and promotes V-J recombination and ${\gamma}{\delta}$T cell development. However, the roles for IL-7R signaling pathway in thymic or extrathymic ${\gamma}{\delta}$T cell development are largely unknown. Methods: To clarify the role of the IL-7 receptor in proliferation and survival of ${\gamma}{\delta}$T cells, we introduced the TCR ${\gamma}{\delta}$ transgene, $V_{{\gamma}2}/V{\delta}_5$, into IL-7R ${\alpha}$-deficient mice, and investigated the development of ${\gamma}{\delta}$T cells. Results: We found that $V_{{\gamma}2}/V{\delta}_5$ transgene restored ${\gamma}{\delta}$T cells in the epithelium of the small intestine (IEL) but not in the thymus and the spleen. Further addition of a bcl-2 transgene resulted in partial recovery of ${\gamma}{\delta}$T cells in the thymus and the spleen of these mice. Conclusion: Taken together, this study revealed that the IL-7R ${\alpha}$ is indispensable for proliferation and survival mainly in thymic ${\gamma}{\delta}$T cell development.

Keywords

References

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