Endocrinology, Vol 137, 1719-1726, Copyright © 1996 by Endocrine Society

ARTICLES

Expression of growth hormone receptors in murine lymphoid cells analyzed by flow cytofluorometry

MC Gagnerault, MC Postel-Vinay and M Dardenne
CNRS URA 1461, Universite Paris V, Hopital Necker, France.

We have analyzed the expression of GH receptors (GHR) in murine lymphoid organs using flow cytofluorometry with biotinylated bovine GH and specific fluorescein isothiocyanate-labeled monoclonal antibodies defining distinct lymphoid cell populations. GHR were widely expressed in al murine hematopoietic tissues and in fetuses, newborns, and 3- and 7-week-old animals. In the bone marrow, all hematopoietic lineages expressed variable levels of GH receptors, whereas in the thymus, this expression was mainly seen in CD4-, CD8-, CD4+CD8+, and CD8+ subpopulations. At the periphery, 50% of splenocytes and peripheral blood lymphocytes and 20% of lymph node cells were GHR positive, with a wider receptor expression on B cells and macrophages (approximately 50%) than on T cells (approximately 20%), where the labeling was seen on both CD4+ and CD8+ cell subsets. Interestingly, the proportion of GHR-bearing CD4+ and CD8+ splenocytes significantly increased after T cell activation with Concanavalin A or anti-CD3. Finally, we demonstrated that all peripheral T cells expressing GHR also expressed PRL receptors. Our study provides a molecular basis to study the factors controlling GHR expression and to better understand the influence of GH in the regulation of immune function.

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