Trends in Endocrinology & Metabolism
Brief reviewThe preovulatory LH surge: A case of a neuroendocrine switch
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Cited by (45)
Live birth associated with peak serum estradiol levels in letrozole intrauterine insemination cycles
2023, Fertility and SterilityEstrus Synchronization in the Sheep and Goat
2021, Veterinary Clinics of North America - Food Animal PracticeCitation Excerpt :FSH secretion stimulates follicular development and increases estradiol-17β secretion. As the estradiol-17β concentration increases, hypothalamic sensitivity to estradiol-17β decreases, which in turn increases GnRH and LH pulse frequency culminating in the LH surge.24,25 The first ovulation of the breeding season occurs after the LH surge, but resultant corpus luteal formation and diestrus is represented by a significantly shortened luteal phase26,27 with minimal progesterone production.28–31
Peptide Neuromodulation in Invertebrate Model Systems
2012, NeuronCitation Excerpt :The authors infer a loop wherein Bseg activity feeds back positively to permit its own concerted release of BUR and release of the proper behavioral sequence (Luan et al., 2012). In endocrinology, the classic example of a positive feedback system is the control of ovulation in mammals, in which the hypothalamus and ovary interact positively to generate the luteinizing hormone surge that coordinates ovulatory events (Clarke, 1995). A threshold level of estrogen is reached in the follicular phase of the ovarian cycle and this signals changes from a negative feedback to a positive one: it now activates cells within the brain, probably disinhibiting inhibitory systems and activating positive inputs including kisspetin and noradrenergic afferents to gonadotropin releasing hormone (GnRH) neurons (Smith et al., 2011).
Neuroendocrine control of reproduction
2012, Handbook of NeuroendocrinologyControl of GnRH secretion: One step back
2011, Frontiers in NeuroendocrinologyCitation Excerpt :This particular study compared responses in ovariectomised ewes within 1 h after a challenge with estrogen, which is considered to be a transient signal to activate the positive feedback mechanism [31]. This signal activates a chain of events, leading to a time-delayed surge in GnRH secretion [26]. This study contrasted the activational state of kisspeptin neurons in the ARC in ovariectomised ewes that were receiving chronic estrogen treatment as opposed to a transient challenge.