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M9650357.TXT
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1996-03-09
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Document 0357
DOCN M9650357
TI The role of endogenous glucocorticoids on host T cell populations in the
peripheral lymphoid organs of mice with graft-versus-host disease.
DT 9605
AU You-Ten KE; Lapp WS; Department of Physiology, McGill University,
Montreal, Quebec,; Canada.
SO Transplantation. 1996 Jan 15;61(1):76-83. Unique Identifier : AIDSLINE
MED/96144872
AB Previously, we demonstrated that immature CD4+8+ and mature CD4+
thymocyte populations were selectively eliminated during murine
graft-versus-host disease (GVHD) as a consequence of elevated levels of
endogenous glucocorticoids. In this report, we investigated whether the
marked reduction of CD4+8+ and CD4+ thymocyte populations would affect
host CD4+ and CD8+ T cell populations in the spleens and lymph nodes
(LN) of mice undergoing GVHD. GVHD was induced in (C57BL/6 x A)F1
(B6AF1) mice by injecting A strain parental lymphoid cells. Using an
antibody against H2Kb antigens, labeled host B6AF1 cells were
distinguished from unlabeled donor A cells. Our results demonstrated a
marked deficiency of host CD4+ and CD8+ T cells in the spleens and LN of
GVHD mice on day 21 after GVHD induction. The severe reduction of host T
cell populations in the peripheral lymphoid organs did not appear to
result from the elimination of CD4+8+ and CD4+ thymocyte populations.
However, adrenalectomy before GVHD induction reversed the severe loss of
both host CD4+ and CD8+ T cell populations in the LN of GVHD mice on day
21, whereas cortisone treatment of adrenalectomized (ADX) GVHD mice
resulted in reduction of host LN CD4+ and CD8+ T cell populations
similar to that observed in non-ADX GVHD animals on day 21. In addition,
adrenalectomy markedly improved the proliferative response of LN T cells
to mitogens when compared with immunosuppressed T cells from the LN of
non-ADX GVHD mice. In contrast, adrenalectomy did not reverse splenic T
cell immunosuppression and the marked reduction of splenic host T cell
populations during GVHD. These results suggest that high levels of
endogenous glucocorticoids during GVHD play a central role in mediating
severe deficiency of host T cell populations and inducing severe T cell
immunosuppression in the LN, but not in the spleen, of GVHD mice.
DE Adrenalectomy Animal CD4-Positive T-Lymphocytes/*IMMUNOLOGY
CD8-Positive T-Lymphocytes/*IMMUNOLOGY Glucocorticoids/*METABOLISM
Graft vs Host Disease/*IMMUNOLOGY/METABOLISM Immunophenotyping
Lymphoid Tissue/*IMMUNOLOGY Mice Mice, Inbred Strains Support,
Non-U.S. Gov't T-Lymphocyte Subsets/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).