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. 1995 Dec;102(3):596–602. doi: 10.1111/j.1365-2249.1995.tb03858.x

Increased expression of proopiomelanocortin (POMC) mRNA in adrenal glands of mice undergoing graft-versus-host disease (GVHD): association with persistent elevated plasma corticosterone levels.

K E You-Ten 1, A Itié 1, T A Seemayer 1, R G Palfree 1, W S Lapp 1
PMCID: PMC1553375  PMID: 8536378

Abstract

GVHD in animal models induces severe thymic atrophy as a result of prolonged secretion of high concentrations of adrenal glucocorticoids. In this study we investigated the mechanism responsible for the persistent stimulation of the adrenal glands to secrete glucocorticoids in mice undergoing GVHD. GVHD was induced across the major and multiple minor histocompatibility antigen difference in unirradiated C57Bl/6 x AF1 hybrid mice by the intravenous injection of A strain parental lymphoid cells. Our results showed plasma corticosterone (CS) levels were elevated in association with high concentrations of corticotropin (ACTH) in both the GVHD and control syngeneic (SYN) groups on day 9. By days 16 and 24, plasma CS and ACTH in the SYN mice returned to basal levels. In contrast, plasma CS levels remained elevated in the GVHD animals on days 16 and 24 despite decreasing concentrations of plasma ACTH. Reverse transcription-polymerase chain reaction (RT-PCR) showed several-fold increase in POMC mRNA in the adrenal glands of GVHD mice compared with SYN animals. In addition, high mRNA levels for murine prohormone convertase 1, the enzyme that cleaves POMC into ACTH, were also detected in GVHD adrenals. Histological analysis of GVHD adrenals failed to show any sign of adrenalitis, and RT-PCR of GVHD adrenals also failed to detect mRNA for interferon-gamma (IFN-gamma), a cytokine expressed by activated T and natural killer (NK) cells. However, mRNA for IL-12, a cytokine produced by activated macrophages, was increased in GVHD adrenals, suggesting that resident adrenal macrophages were activated during GVHD. Our findings suggest that persistent elevated levels of plasma glucocorticoids during GVHD could be mediated by intra-adrenal ACTH produced by resident adrenal macrophages activated as a consequence of GVHD.

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Selected References

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