Estradiol Increases Alpha7 Nicotinic Receptor in Serotonergic Dorsal Raphe and Noradrenergic Locus Coeruleus Neurons of Macaques.
From: Division of Reproductive Sciences, Oregon National Primate Research Center, Beaverton, Oregon 97006, USA. centenom@ohsu.edu
The Journal of comparative neurology
- Publish Date: Jul 2006
- ISSN: 0021-9967
- Volume: 497
- Issue: 3
- Pages: 489-501
- Medium: Print
- Language: English
- Citation (JAMA): Centeno Maria Luisa, Henderson Jessica A, Pau K-Y Francis, et al. Estradiol Increases Alpha7 Nicotinic Receptor in Serotonergic Dorsal Raphe and Noradrenergic Locus Coeruleus Neurons of Macaques.. J. Comp. Neurol. Jul 2006;497:489-501
Abstract
Acetylcholine, acting on presynaptic nicotinic receptors (nAChRs), modulates the release of neurotransmitters in the brain. The rat dorsal raphe nucleus (DR) and the locus coeruleus (LC) receive cholinergic input and express the alpha7nAChR. In previous reports, we demonstrated that estradiol (E) administration stimulates DR serotonergic and LC noradrenergic function in the macaque. In addition, it has been reported that E induces the expression of the alpha7nAChR in rats. We questioned whether E increased the expression of the alpha7nAChR in the macaque DR and LC. We utilized double immunostaining to study the effect of a simulated preovulatory surge of E on the expression of the alpha7nAChR in the DR and the LC and to determine whether alpha7nAChR colocalizes with serotonin and tyrosine hydroxylase (TH) in macaques. There was no difference in the number of alpha7nAChR-positive neurons between ovariectomized (OVX) controls and OVX animals treated with a silastic capsule containing E (Ecap). However, supplemental infusion of E for 5-30 hours to Ecap animals (Ecap + inf) significantly increased the number of alpha7nAChR-positive neurons in DR and LC. In addition, supplemental E infusion significantly increased the number of neurons in which alpha7nAChR colocalized with serotonin and TH. These results constitute an important antecedent for study of the effects of nicotine and ovarian steroid hormones in the physiological functions regulated by the DR and the LC in women.
Mesh Headings (Keywords): Animals, Drug Implants, Estradiol, Female, Follicular Phase, Immunohistochemistry, Locus Coeruleus, Macaca mulatta, Neurons, Norepinephrine, Ovariectomy, Presynaptic Terminals, Raphe Nuclei, Receptors, Nicotinic, Serotonin, Tissue Distribution
Check for Full Text / PubMed Unique Identifier (PMID): 16736471
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