{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:18:36Z","timestamp":1760235516092,"version":"build-2065373602"},"reference-count":89,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2021,8,31]],"date-time":"2021-08-31T00:00:00Z","timestamp":1630368000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>We investigated the effects of sexual arousal induced by olfactory stimuli on the expression of neuromodulators, neurotransmitters and sexual steroid receptors in the suprachiasmatic nucleus (SCN, the circadian pacemaker of mammals) and other cerebral entities of Syrian hamsters (Mesocricetus auratus) compared to manual sleep deprivation and immobilization stress. The hamsters kept under a 12:12 hours (h) light:dark cycle were deprived of sleep by sexual stimulation, gentle manual handling or immobilization stress for 1 h at the beginning of the light phase and subsequently sacrificed at zeitgeber time 01:00, respectively; for comparison, hamsters were manually sleep deprived for 6 or 20 h or sacrificed after completing a full sleep phase. As demonstrated by immunohistochemistry, apart from various alterations after manual sleep deprivation, sexual stimulation caused down-regulation of arginine-vasopressin (AVP), vasointestinal peptide (VIP), serotonin (5-HT), substance P (SP), and met-enkephalin (ME) in the SCN. Somatostatin (SOM) was diminished in the medial periventricular nucleus (MPVN). In contrast, an increase in AVP was observed in the PVN, that of oxytocin (OXY) in the supraoptic nucleus (SON), of tyrosine-hydroxylase (TH) in the infundibular nucleus (IN), and dopamine beta-hydroxylase (DBH) in the A7 neuron population of the brain stem (A7), respectively. Testosterone in plasma was increased. The results indicate that sexual arousal extensively influences the neuropeptide systems of the SCN, suggesting an involvement of the SCN in reproductive behavior.<\/jats:p>","DOI":"10.3390\/ijerph18179169","type":"journal-article","created":{"date-parts":[[2021,8,31]],"date-time":"2021-08-31T08:42:32Z","timestamp":1630399352000},"page":"9169","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Effects of Sleep Deprivation by Olfactorily Induced Sexual Arousal Compared to Immobilization Stress and Manual Sleep Deprivation on Neuromessengers and Time Keeping Genes in the Suprachiasmatic Nuclei and Other Cerebral Entities of Syrian Hamsters\u2014An Immunohistochemical Study"],"prefix":"10.3390","volume":"18","author":[{"given":"Christian","family":"Kn\u00f6chel","sequence":"first","affiliation":[{"name":"Vitos Clincis of Forensic Psychiatry Eltville, 65346 Eltville, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8967-9528","authenticated-orcid":false,"given":"Hagen","family":"Frickmann","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Hospital Hygiene, Bundeswehr Hospital Hamburg, 20359 Hamburg, Germany"},{"name":"Institute for Medical Microbiology, Virology and Hygiene, University Medicine Rostock, 18057 Rostock, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank","family":"N\u00fcrnberger","sequence":"additional","affiliation":[{"name":"Institute for Anatomy II, Goethe-Universit\u00e4t Frankfurt am Main, 60590 Frankfurt am Main, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"843","DOI":"10.1016\/j.neuroscience.2006.01.002","article-title":"Vasopressin interactions with oxytocin in the control of female sexual behavior","volume":"139","author":"Pedersen","year":"2006","journal-title":"Neuroscience"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1016\/S0149-7634(05)80176-9","article-title":"Oxytocin and sexual behavior","volume":"16","author":"Carter","year":"1992","journal-title":"Neurosci. 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