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Retinoic acid receptor γ regulates B and T lymphopoiesis via nestin-expressing cells in the bone marrow and thymic microenvironments

Citation

Joseph, C and Nota, C and Fletcher, JL and Maluenda, AC and Green, AC and Purton, LE, Retinoic acid receptor γ regulates B and T lymphopoiesis via nestin-expressing cells in the bone marrow and thymic microenvironments, Journal of Immunology, 196, (5) pp. 2132-2144. ISSN 0022-1767 (2016) [Refereed Article]

DOI: doi:10.4049/jimmunol.1501246

Abstract

Vitamin A has essential but largely unexplained roles in regulating lymphopoiesis. We have previously shown that retinoic acid receptor (RAR) γ-deficient mice have hematopoietic defects, some phenotypes of which were microenvironment induced. Bone marrow (BM) microenvironment cells identified by either their expression of nestin (Nes) or osterix (Osx) have previously been shown to have roles in regulating lymphopoiesis. We therefore conditionally deleted Rarγ in Nes- or Osx-expressing microenvironment cells. Osx cell-specific deletion of Rarγ had no impact on hematopoiesis. In contrast, deletion of Rarγ in Nes-expressing cells resulted in reductions in peripheral blood B cells and CD4+ T cells, accompanied by reductions of immature PreB cells in BM. The mice lacking Rarγ in Nes-expressing cells also had smaller thymi, with reductions in double-negative 4 T cell precursors, accompanied by reduced numbers of both TCRβlow immature single-positive CD8+ cells and double-positive T cells. In the thymus, Nes expression was restricted to thymic stromal cells that expressed cerebellar degeneration-related Ag 1 and lacked expression of epithelial cell adhesion molecule. These cells expressed platelet-derived growth factor α and high transcript levels of Rars, Cxcl12, and stem cell factor (Scf). Short-term treatment of mice with all-trans retinoic acid resulted in increased PreB lymphopoiesis in BM and an increase in thymic double-negative 4 T cells, inverse to that observed upon Nes cell-specific deletion of Rarγ. Collectively, these studies show that RARγ is a regulator of B and T lymphopoiesis via Nes-expressing cells in the BM and thymic microenvironments, respectively.

Item Details

Item Type:Refereed Article
Keywords:haematopoiesis, lymphocytes, thymus
Research Division:Biomedical and Clinical Sciences
Research Group:Cardiovascular medicine and haematology
Research Field:Haematology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biomedical and clinical sciences
UTAS Author:Fletcher, JL (Dr Jessica Fletcher)
ID Code:147215
Year Published:2016
Web of Science® Times Cited:12
Deposited By:Menzies Institute for Medical Research
Deposited On:2021-10-19
Last Modified:2021-10-25
Downloads:0

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