1. Stress-induced glucocorticoid desensitizes adrenoreceptors to gate the neuroendocrine response to somatic stress in male mice.
- Author
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Jiang, Zhiying, Chen, Chun, Weiss, Grant L., Fu, Xin, Stelly, Claire E., Sweeten, Brook L.W., Tirrell, Parker S., Pursell, India, Stevens, Carly R., Fisher, Marc O., Begley, John C., Harrison, Laura M., and Tasker, Jeffrey G.
- Abstract
Noradrenergic afferents to hypothalamic corticotropin releasing hormone (CRH) neurons provide a major excitatory drive to the hypothalamic-pituitary-adrenal (HPA) axis via α1 adrenoreceptor activation. Noradrenergic afferents are recruited preferentially by somatic, rather than psychological, stress stimuli. Stress-induced glucocorticoids feed back onto the hypothalamus to negatively regulate the HPA axis, providing a critical autoregulatory constraint that prevents glucocorticoid overexposure and neuropathology. Whether negative feedback mechanisms target stress modality-specific HPA activation is not known. Here, we describe a desensitization of the α1 adrenoreceptor activation of the HPA axis following acute stress in male mice that is mediated by rapid glucocorticoid regulation of adrenoreceptor trafficking in CRH neurons. Glucocorticoid-induced α1 receptor trafficking desensitizes the HPA axis to a somatic but not a psychological stressor. Our findings demonstrate a rapid glucocorticoid suppression of adrenergic signaling in CRH neurons that is specific to somatic stress activation, and they reveal a rapid, stress modality-selective glucocorticoid negative feedback mechanism. [Display omitted] • Stress-induced glucocorticoid suppresses norepinephrine activation of CRH neurons • The rapid glucocorticoid effect is mediated by α1 adrenoreceptor desensitization • The glucocorticoid effect is specific to somatic, not psychological, stress • This reveals a stress modality-specific rapid glucocorticoid feedback mechanism Physical and psychological stressors activate neuroendocrine secretion of corticosteroid. Noradrenaline circuits are critical to the neuroendocrine response to physical but not psychological stress. Jiang et al. show that stress-induced corticosteroids decrease noradrenaline sensitivity in the brain, which suppresses the response to subsequent physical stressors but leaves the psychological stress response intact. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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