Sensory denervation with capsaicin reduces ovarian follicular development and delays the onset of puberty in guinea pigs

DOI: 10.4236/arsci.2013.13005   PDF   HTML   XML   3,843 Downloads   8,095 Views   Citations


Introduction: It has been documented that mammalian ovaries receive sympathetic, parasympathetic and sensory nerve fibers. The aim of this work was to investigate the effects of sensory denervation with capsaicin at the first vaginal opening (FVO) on follicular development and the expression of TRPV1 receptors in ovary cells as well as in the dorsal root ganglia (DRGs) and lumbar dorsal spinal cord neurons of guinea pigs. The DRGs and lumbar dorsal spinal cord neurons serve as a nerve connection from the ovaries to the CNS. Materials and Methods: Female guinea pigs received a subcutaneous injection of capsaicin (30 mM) at 10 days of age (P10), while control animals were injected with vehicle. Using light microscopy, we counted healthy preantral follicles (HPF), healthy antral follicles (HAF), atretic preantral follicles (APF), and atretic antral follicles (AAF) in the ovaries at the FVO, and the numbers of TRPV1-positive cells were counted in the ovarian follicles, DRGs, and lumbar dorsal spinal cord (L2-L4) neurons by immunohistochemistry. Results: Guinea pigs treated with capsaicin showed a significant delay of FVO in comparison with the control animals (36 vs. 44 days). In the ovaries, the number of preantral and antral follicles decreased significantly. Additionally, the number of TRPV1-positive thecainterstitial cells of the antral follicles was reduced significantly, and the number of TRPV1-positive neurons in the DRGs and lumbar dorsal spinal cord (L2-L4) decreased. Thus, we showed that TRPV1 receptors throughout the sensory fibers modulate ovarian follicular development and the onset of puberty in guinea pigs. Conclusion: Sensory denervation decreases ovarian follicular development and delays the onset of puberty of guinea pigs. Our data support the idea that through TRPV1 receptors, ovarian afferent fibers sense local stimuli that are sent to the CNS.

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Alatriste, V. , Herrera-Camacho, I. , I. Martínez, M. , D. Limón, I. , González-Flores, O. and Luna, F. (2013) Sensory denervation with capsaicin reduces ovarian follicular development and delays the onset of puberty in guinea pigs. Advances in Reproductive Sciences, 1, 29-37. doi: 10.4236/arsci.2013.13005.

Conflicts of Interest

The authors declare no conflicts of interest.


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