Date of Graduation
Davis College of Agriculture, Natural Resources and Design
Animal and Nutritional Sciences
Stanley M Hileman
Robert L Goodman
Clay A Lents
Puberty is a process that incorporates a large array of both external factors and internal signals. The endocrinology of puberty has been studied in a number of mammalian species and typically depends upon an increase in hypothalamic secretion of gonadotropin releasing hormone (GnRH). Neural inputs regulating GnRH secretion during the pubertal process are not completely understood. In the past decade, attention has focused on the role for a particular set of neurons located in the arcuate nucleus (ARC) of the hypothalamus. They have been named KNDy neurons because they coexpress kisspeptin, neurokinin B (NKB) and dynorphin and have been shown to stimulate (kisspeptin, NKB) or inhibit (dynorphin) GnRH and luteinizing hormone (LH) secretion. While KNDy neurons have been studied extensively in primates, rodents, and sheep, almost nothing is known about this system in porcine, a species of significant agricultural importance. Our studies describe an initial foray into characterizing this system in the porcine hypothalamus. We first determined that, similar to other species, kisspeptin was expressed in the ARC and that NKB and kisspeptin were coexpressed in this region to a very high extent. We then examined the distribution of receptors for NKB (NK3R) and found them to be expressed in the preoptic area (POA) and several areas of the hypothalamus, including the paraventricular nucleus (PVN) and retrochiasmatic area (RCh). However, there was no evidence of NK3R expression in the ARC. The NK3R-positive cells found in the POA did not co-localize with GnRH but expressed close contacts with GnRH neurons. We then used gilts that were ovariectomized (OVX) or OVX and treated with Altrenogest (OVXA), a progestin, to test the hypothesis that Altrenogest would suppress kisspeptin and NKB immunopositive cell numbers in the ARC and NK3R-positive cell numbers throughout the hypothalamus. Surprisingly, kisspeptin containing cell numbers tended to be increased (p = 0.09) in in OVXA gilts (n = 6) compared to their OVX, untreated counterparts (n = 6). In addition, there was no significant change in NKB-positive cell numbers in response to Altrenogest. Subsequent analysis determined a tendency (p = 0.08) for a decrease in the percentage of kisspeptin neurons expressing c-Fos, a marker of neural activation, in OVXA versus OVX gilts. There was no effect of Altrenogest on NK3R-positive cell numbers in any area. These studies mark one of the first investigations into the KNDy system in swine. Many of the characteristics examined here are similar to that previously reported for other mammalian species, with the notable exception of an absence of NK3R expression within the ARC. Treatment with a progestin did not suppress kisspeptin or NKB expression but did tend to reduce activity of kisspeptin neurons. These results suggest that, similar to other species, KNDy neurons likely play an important role in regulating reproduction in swine.
Lindo, Ashley Nicollette, "Characterization of KNDy Neuronal Activity in Gilts: Distribution and Effect of A Progestin" (2018). Graduate Theses, Dissertations, and Problem Reports. 6093.