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Volume 76, Issue 1
July 2002

Article Navigation
Research Articles| July 01 2002


5-HT2A AND 5-HT2C SEROTONIN RECEPTORS DIFFERENTIALLY MODULATE MOUSE SEXUAL
AROUSAL AND THE HYPOTHALAMO-PITUITARY-TESTICULAR RESPONSE TO THE PRESENCE OF A
FEMALE

Subject Area: Endocrinology , Neurology and Neuroscience
Nina K. Popova;
Nina K. Popova
Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of
Sciences, Novosibirsk, Russia
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Tamara G. Amstislavskaya
Tamara G. Amstislavskaya
Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of
Sciences, Novosibirsk, Russia
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Neuroendocrinology (2002) 76 (1): 28–34.
https://i646f69o6f7267z.oszar.com/10.1159/000063681
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Published Online:
July 01 2002

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Citation

Nina K. Popova, Tamara G. Amstislavskaya; 5-HT2A and 5-HT2C Serotonin Receptors
Differentially Modulate Mouse Sexual Arousal and the
Hypothalamo-Pituitary-Testicular Response to the Presence of a Female.
Neuroendocrinology 1 July 2002; 76 (1): 28–34.
https://i646f69o6f7267z.oszar.com/10.1159/000063681

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ABSTRACT

The role of 5-HT2A and 5-HT2C subtypes of serotonergic receptors in the control
of sexual behavior and plasma testosterone regulation was studied in male CBA
mice exposed to a sexually receptive female separated by a transparent
partition. Introduction of the receptive female induced sexual motivation and
arousal in males, as evidenced by a prolonged time spent at the partition,
unsuccessful attempts to step across it and a significant increase in plasma
testosterone levels. Administration of 5-HT2A receptor antagonists ketanserin
(1.0 and 2.0 mg/kg i.p.) or cyproheptadine (1.0 and 2.0 mg/kg i.p.) diminished
the behavioral components and prevented the hormonal components of male sexual
arousal. Administration of the selective 5-HT2C antagonist RS 102221 (1.0 and
2.0 mg/kg) considerably increased the time spent by males at the partition (p <
0.001) and, at the dose of 2.0 mg/kg, increased plasma testosterone levels (p <
0.01). Administration of ritanserin – a nonselective 5-HT2A/2C antagonist and,
to a smaller degree, 5-HT2B antagonist – at doses of 0.1 and 0.5 mg/kg did not
significantly influence male behavior and the activating effect of the presence
of a female on the hypothalamo-pituitary-testicular system, although it
increased resting testosterone levels (p < 0.05). The present findings suggest
that 5-HT2A/5-HT2C receptors may be involved in the neural control of male
sexual motivation and arousal, presumably by exerting reciprocal facilitative
(5-HT2A) or suppressive (5-HT2C) influences.

Keywords:
Sexual arousal, Serotonin receptors, Gonadal steroids, Serotonin antagonists



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