Haploinsufficiency of steroidogenic factor-1 in mice disrupts adrenal development leading to an impaired stress response
AUTOR(ES)
Bland, Michelle L.
FONTE
The National Academy of Sciences
RESUMO
Adrenal steroids are essential for homeostasis and survival during severe physiological stress. Analysis of a patient heterozygous for the steroidogenic factor-1 (SF-1) gene suggested that reduced expression of this nuclear receptor leads to adrenal failure. We therefore examined SF-1 heterozygous (+/−) mice as a potential model for delineating mechanisms underlying this disease. Here we show that SF-1 +/− mice exhibit adrenal insufficiency resulting from profound defects in adrenal development and organization. However, compensatory mechanisms, such as cellular hypertrophy and increased expression of the rate-limiting steroidogenic protein StAR, help to maintain adrenal function at near normal capacity under basal conditions. In contrast, adrenal deficits in SF-1 heterozygotes are revealed under stressful conditions, demonstrating that normal gene dosage of SF-1 is required for mounting an adequate stress response. Our findings predict that natural variations leading to reduced SF-1 function may underlie some forms of subclinical adrenal insufficiency, which become life threatening during traumatic stress.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=18946Documentos Relacionados
- Impaired adrenal stress response in Toll-like receptor 2-deficient mice
- Inhibition of Adrenocortical Carcinoma Cell Proliferation by Steroidogenic Factor-1 Inverse Agonists
- Impaired Cardiac Contractility Response to Hemodynamic Stress in S100A1-Deficient Mice
- Chemotaxis of primitive hematopoietic cells in response to stromal cell–derived factor-1
- Impaired colonization of the gonads by primordial germ cells in mice lacking a chemokine, stromal cell-derived factor-1 (SDF-1)