Effects of systemic administration or intrabursal injection of serotonin on puberty, first ovulation and follicular development in rats
M. J. Moran A E , M. E. Ayala A E , E. Gallegos A , J. Romero A , R. Chavira C , P. Damián-Matsumura D and R. Domínguez A
+ Author Affiliations
- Author Affiliations
A Unidad de Investigación en Biología de la Reproducción, Laboratorio de Pubertad. Facultad de Estudios Superiores Zaragoza, UNAM. AP 9-020, CP 15000, México D.F., México.
B Laboratorio de Hormonas Esteroides. Instituto de Ciencias Médicas y de la Salud Salvador Subirán, Tlalpan, México D.F. 14000, México D.F., Mexico.
C Departamento de Biología de la Reproducción. UAM Iztapalapa, México D.F., México.
D Deceased.
E Corresponding author. Email: marayalamx@yahoo.com.mx
Reproduction, Fertility and Development 25(8) 1105-1114 https://doi.org/10.1071/RD12253
Submitted: 2 August 2012 Accepted: 7 October 2012 Published: 23 November 2012
Abstract
To elucidate the role of serotonin in the onset of puberty, the effects of both systemic and in-ovarian bursa administration of serotonin on the neuroendocrine mechanism that modulates the onset of puberty, follicular development and first ovulation were evaluated. Two experiments were carried out. For the first, 25 or 37.5 mg kg–1 of bodyweight of serotonin creatinine sulfate was administered by a subcutaneous route to 30-day-old female rats. In the second experiment, serotonin creatinine sulfate was administered directly into the ovarian bursa of 34-day-old female rats. Systemic administration of 25 or 37.5 mg kg–1 of serotonin creatinine sulfate induced a delay in the ages of vaginal opening and first vaginal oestrus, a decrease in the number of ovulating animals, and serum concentrations of FSH, LH, oestradiol and progesterone. An increase in the number of Class 3 (>500 μm) and atretic follicles was observed in the ovaries of these animals. The administration of serotonin creatinine sulfate in the ovarian bursa did not modify the onset of puberty and ovulation, but a reduced serum concentration of oestradiol was observed. Our results suggest that serotonin acts on the components of the hypothalamus–hypophysis–ovary axis by modulating follicular development, ovarian functions and the onset of puberty.
Additional keywords : gonadotrophins, hypothalamus, oestrogens, ovary, progesterone.
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