Angiotensina II no mecanismo inicial de ovulação, através dos receptores AT2, em bovinos

Abstract

The aim of this work was to investigate the role of angiotensin II (Ang II) in the mechanism of ovulation in the bovine, using an in vivo model, through the injection of the Ang II receptor antagonists in mature follicles. The animals were pre-synchronized and when the follicles reached a minimum diameter of 12mm, they received the treatments and were challenged with an IM application of GnRH-analogous. The intrafolicular application of 100 μM of saralasin blocked the ovulation only before estrous; therefore, before the LH surge (14.3% e 83.3% cows ovulated in the saralasin and control group, respectively; P<0.05). Based in these results, a second experiment was carried out to determine the moment in which Ang II plays critical role in the ovulation. Saralasin blocked ovulation only when applied at 0 and 6 hours (16.7 e 42.9% in the 0 and 6 hours groups, respectively) but not at 12 hours (100%) after GnRh-analogous treatment (P<0.001). To determine which Ang II receptor is involved in the LH-induced ovulation, an intrafolicular application of losartan (AT1-Ang II receptor-antagonist), PD123,319 (AT2 antagonist), losartan+PD123,319 or saline was performed at the moment in which the cows were challenged with GnRH-analogous. The ovulation was inhibited by PD123,319 and losartan+PD123,319 application (50.0 e 33.3% on ovulation rate, respectively), but not by the application of losartan or saline solution (100% in both the groups). The results demonstrated that Ang II plays a basic role in the early mechanism of bovine ovulation via AT2 receptor subtype.