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Thymocytes may persist and differentiate without any input from bone marrow progenitors.

Abstract
Thymus transplants can correct deficiencies of the thymus epithelium caused by the complete DiGeorge syndrome or FOXN1 mutations. However, thymus transplants were never used to correct T cell-intrinsic deficiencies because it is generally believed that thymocytes have short intrinsic lifespans. This notion is based on thymus transplantation experiments where it was shown that thymus-resident cells were rapidly replaced by progenitors originating in the bone marrow. In contrast, here we show that neonatal thymi transplanted into interleukin 7 receptor-deficient hosts harbor populations with extensive capacity to self-renew, and maintain continuous thymocyte generation and export. These thymus transplants reconstitute the full diversity of peripheral T cell repertoires one month after surgery, which is the earliest time point studied. Moreover, transplantation experiments performed across major histocompatibility barriers show that allogeneic transplanted thymi are not rejected, and allogeneic cells do not induce graft-versus-host disease; transplants induced partial or total protection to infection. These results challenge the current dogma that thymocytes cannot self-renew, and indicate a potential use of neonatal thymus transplants to correct T cell-intrinsic deficiencies. Finally, as found with mature T cells, they show that thymocyte survival is determined by the competition between incoming progenitors and resident cells.
AuthorsLaetitia Peaudecerf, Sara Lemos, Alessia Galgano, Gerald Krenn, Florence Vasseur, James P Di Santo, Sophie Ezine, Benedita Rocha
JournalThe Journal of experimental medicine (J Exp Med) Vol. 209 Issue 8 Pg. 1401-8 (Jul 30 2012) ISSN: 1540-9538 [Electronic] United States
PMID22778388 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Receptors, Interleukin-7
Topics
  • Animals
  • Bone Marrow Cells (cytology, immunology, metabolism)
  • Cell Differentiation (immunology)
  • Graft vs Host Disease (immunology, metabolism, prevention & control)
  • Mice
  • Mice, Inbred BALB C
  • Receptors, Interleukin-7 (deficiency, immunology, metabolism)
  • T-Lymphocytes (cytology, immunology, metabolism)
  • Thymocytes (cytology, immunology, metabolism)
  • Thymus Gland (immunology, metabolism, transplantation)
  • Transplantation, Homologous

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