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de Almeida RMM, Cabral JCC, Narvaes R. Behavioural, hormonal and neurobiological mechanisms of aggressive behaviour in human and nonhuman primates. Physiol Behav 2015; 143:121-35. [DOI: 10.1016/j.physbeh.2015.02.053] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Revised: 02/25/2015] [Accepted: 02/28/2015] [Indexed: 12/27/2022]
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Mallmann ES, Paixão L, Ribeiro MF, Spritzer PM. Serotonergic 5-HT2A/2C receptors are involved in prolactin secretion in hyperestrogenic rats. Neurosci Lett 2014; 582:71-4. [PMID: 25220702 DOI: 10.1016/j.neulet.2014.09.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 08/18/2014] [Accepted: 09/01/2014] [Indexed: 11/24/2022]
Abstract
Serotonin (5-HT) has been shown to participate in prolactin secretion through a complex process resulting in both positive and negative effects. Estrogen has also been recognized as being involved in this serotonergic effect on prolactin release. Therefore, the aim of the present study was to assess whether estradiol modulates serotonergic involvement in prolactin secretion though 5-HT1A and/or 5-HT2A/2C receptors. Ovariectomized female Wistar rats, treated for 2 weeks with estrogen to induce a hyperprolactinemic status (hyperestrogenic rats) or with sunflower oil vehicle (hypoestrogenic rats), were injected daily with normal saline solution or 6-chloro-2-(1-piperazinyl)pyrazine (MK-212), an 5-HT2A/2C receptor agonist, for 4 days. Other groups of ovariectomized animals received 8-hydroxy-2-(di-N-propylamino)tetralin (8-OH-DPAT) or pindolol, an agonist and antagonist of the 5-HT1A receptor respectively, on the last day of treatment with estrogen or vehicle. Prolactin levels were compared among groups in each experiment under the distinct drug treatments. MK-212 was found to increase prolactin concentrations both in hyper- and hypoestrogenic females compared to controls (p<0.05). In contrast, prolactin levels remained similar to those of controls both in hyperestrogenic animals treated with 8-OH-DPAT and pindolol and in hypoestrogenic rats administered the same treatments. In conclusion, our findings indicate the involvement of 5-HT2A/2C receptors on prolactin release through serotonergic pathways in female animals, especially in hyperestrogenic states.
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Affiliation(s)
- E S Mallmann
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre (HCPA), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil; Division of Gynecology and Obstetrics, Hospital Presidente Vargas, Avenida Independência 661, 90035-070 Porto Alegre, Brazil
| | - L Paixão
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre (HCPA), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil; Department of Physiology, Universidade Federal do Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil
| | - M F Ribeiro
- Department of Physiology, Universidade Federal do Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil
| | - P M Spritzer
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre (HCPA), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil; Department of Physiology, Universidade Federal do Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2350, 90035-003 Porto Alegre, Brazil.
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