PMID- 24805361 OWN - NLM STAT- MEDLINE DCOM- 20150123 LR - 20211021 IS - 1932-6203 (Electronic) IS - 1932-6203 (Linking) VI - 9 IP - 5 DP - 2014 TI - Estrogenic regulation of histamine receptor subtype H1 expression in the ventromedial nucleus of the hypothalamus in female rats. PG - e96232 LID - 10.1371/journal.pone.0096232 [doi] LID - e96232 AB - Female sexual behavior is controlled by central estrogenic action in the ventromedial nucleus of the hypothalamus (VMN). This region plays a pivotal role in facilitating sex-related behavior in response to estrogen stimulation via neural activation by several neurotransmitters, including histamine, which participates in this mechanism through its strong neural potentiating action. However, the mechanism through which estrogen signaling is linked to the histamine system in the VMN is unclear. This study was undertaken to investigate the relationship between estrogen and histamine receptor subtype H1 (H1R), which is a potent subtype among histamine receptors in the brain. We show localization of H1R exclusively in the ventrolateral subregion of the female VMN (vl VMN), and not in the dorsomedial subregion. In the vl VMN, abundantly expressed H1R were mostly colocalized with estrogen receptor alpha. Intriguingly, H1R mRNA levels in the vl VMN were significantly elevated in ovariectomized female rats treated with estrogen benzoate. These data suggest that estrogen can amplify histamine signaling by enhancing H1R expression in the vl VMN. This enhancement of histamine signaling might be functionally important for allowing neural excitation in response to estrogen stimulation of the neural circuit and may serve as an accelerator of female sexual arousal. FAU - Mori, Hiroko AU - Mori H AD - Department of Medical Education, Kyoto Prefectural University of Medicine, Kawaramachi Hirokoji, Kamigyo-ku, Kyoto, Japan. FAU - Matsuda, Ken-Ichi AU - Matsuda K AD - Department of Anatomy and Neurobiology, Kyoto Prefectural University of Medicine, Kawaramachi Hirokoji, Kamigyo-ku, Kyoto, Japan. FAU - Yamawaki, Masanaga AU - Yamawaki M AD - Department of Medical Education, Kyoto Prefectural University of Medicine, Kawaramachi Hirokoji, Kamigyo-ku, Kyoto, Japan. FAU - Kawata, Mitsuhiro AU - Kawata M AD - Department of Anatomy and Neurobiology, Kyoto Prefectural University of Medicine, Kawaramachi Hirokoji, Kamigyo-ku, Kyoto, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20140507 PL - United States TA - PLoS One JT - PloS one JID - 101285081 RN - 0 (Estrogens) RN - 0 (Receptors, Histamine H1) SB - IM MH - Animals MH - Blotting, Western MH - Estrogens/*pharmacology MH - Female MH - Immunohistochemistry MH - Male MH - Ovariectomy MH - Rats MH - Rats, Sprague-Dawley MH - Real-Time Polymerase Chain Reaction MH - Receptors, Histamine H1/genetics/*metabolism MH - Ventromedial Hypothalamic Nucleus/*drug effects/*metabolism PMC - PMC4013143 COIS- Competing Interests: The authors have declared that no competing interests exist. EDAT- 2014/05/09 06:00 MHDA- 2015/01/24 06:00 PMCR- 2014/05/07 CRDT- 2014/05/09 06:00 PHST- 2013/05/08 00:00 [received] PHST- 2014/04/04 00:00 [accepted] PHST- 2014/05/09 06:00 [entrez] PHST- 2014/05/09 06:00 [pubmed] PHST- 2015/01/24 06:00 [medline] PHST- 2014/05/07 00:00 [pmc-release] AID - PONE-D-13-18872 [pii] AID - 10.1371/journal.pone.0096232 [doi] PST - epublish SO - PLoS One. 2014 May 7;9(5):e96232. doi: 10.1371/journal.pone.0096232. eCollection 2014.