Title: Effect of electro-acupuncture on ovarian expression of ? (1)- and ? (2)-adrenoceptors, and p75 neurotrophin receptors in rats with steroid-induced polycystic ovaries
Author: Manni Luigi ; Lundeberg Thomas ; Holmäng Agneta ; Aloe Luigi ; Stener-Victorin Elisabet
Estradiol valerate (EV)-induced polycystic ovaries (PCO) in rats is associated with an increase in ovarian sympathetic outflow. Low-frequency (2 Hz) electro-acupuncture (EA) has been shown to modulate sympathetic markers as well as ovarian blood flow as a reflex response via the ovarian sympathetic nerves, in rats with EV-induced PCO.
In the present study, we further tested the hypothesis that repeated 2 Hz EA treatments modulate ovarian sympathetic outflow in rats with PCO, induced by a single i.m. injection of EV, by investigating the mRNA expression, the amount and distribution of proteins of ?1a-, ?1b-, ?1d-, and ?2-adrenoceptors (ARs), as well as the low-affinity neurotrophin receptor (p75NTR).
It was found that EV injection results in significantly higher mRNA expression of ovarian ?1b- and ?1d-AR in PCO rats compared to control rats. The p75NTR and ?2-ARs mRNA expression were unchanged in the PCO ovary. Low-frequency EA resulted in a significantly lower expression of ?2-ARs mRNA expression in PCO rats. The p75NTR mRNA was unaffected in both PCO and control rats. PCO ovaries displayed significantly higher amount of protein of ?1a-, ?1b- and ?1d-ARs, and of p75NTR, compared to control rats, that were all counteracted by repeated low-frequency EA treatments, except for ?1b-AR.
The present study shows that EA normalizes most of the EV-induced changes in ovarian ARs. Furthermore, EA was able to prevent the EV-induced up regulation of p75NTR, probably by normalizing the sympathetic ovarian response to NGF action. Our data indicate a possible role of EA in the regulation of ovarian responsiveness to sympathetic inputs and depict a possible complementary therapeutic approach to overcoming sympathetic-related anovulation in women with PCOS.
Journal: Reproductive Biology and Endocrinology