期刊
STRESS-THE INTERNATIONAL JOURNAL ON THE BIOLOGY OF STRESS
卷 19, 期 4, 页码 374-382出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10253890.2016.1174851
关键词
Acute psychogenic stress; chronic psychogenic stress; corticosterone; HPA axis; hypophagia; pituitary adenylate cyclase-activating polypeptide; prolonged psychogenic stress; restraint stress
资金
- Intramural NIH HHS [ZIA MH002386-23, ZIA MH002386] Funding Source: Medline
- NIMH NIH HHS [Z01 MH002386] Funding Source: Medline
We measured serum CORT elevation in wild-type and PACAP-deficient C57BL/6N male mice after acute (1h) or prolonged (2-3h) daily restraint stress for 7 d. The PACAP dependence of CORT elevation was compared to that of stress-induced hypophagia. Daily restraint induced unhabituated peak CORT elevation, and hypophagia/weight loss, of similar magnitude for 1, 2, and 3h of daily restraint, in wild-type mice. Peak CORT elevation, and hypophagia, were both attenuated in PACAP-deficient mice for 2 and 3h daily restraint. Hypophagia induced by 1-h daily restraint was also greatly reduced in PACAP-deficient mice, however CORT elevation, both peak and during recovery from stress, was unaffected. Thus, hypothalamic PACAPergic neurotransmission appears to affect CRH gene transcription and peptide production, but not CRH release, in response to psychogenic stress. A single exposure to restraint sufficed to trigger hypophagia over the following 24h. PACAP deficiency attenuated HPA axis response (CORT elevation) to prolonged (3h) but not acute (1h) single-exposure restraint stress, while hypophagia induced by either a single 1h or a single 3h restraint were both abolished in PACAP-deficient mice. These results suggest that PACAP's actions to promote suppression of food intake following an episode of psychogenic stress is unrelated to the release of CRH into the portal circulation to activate the pituitary-adrenal axis. Furthermore, demonstration of suppressed food intake after a single 1-h restraint stress provides a convenient assay for investigating the location of the synapses and circuits mediating the effects of PACAP on the behavioral sequelae of psychogenic stress.
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