The Journal of clinical endocrinology and metabolism · 2019
Hypothalamic Reproductive Endocrine Pulse Generator Activity Independent of Neurokinin B and Dynorphin Signaling.
СтатьяПоддержка NIH: внешняя программаПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
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Lippincott Margaret F, León Silvia, Chan Yee-Ming, Fergani Chrysanthi, Talbi Rajae, Farooqi I Sadaf, Jones Christopher M, Arlt Wiebke, Stewart Susan E, Cole Trevor R, Terasawa Ei, Hall Janet E, Shaw Natalie D, Navarro Victor M, Seminara Stephanie Beth
Аннотация
CONTEXT: Kisspeptin-neurokinin B (NKB)-dynorphin neurons are critical regulators of the hypothalamic-pituitary-gonadal axis. NKB and dynorphin are hypothesized to influence the frequency of GnRH pulses, whereas kisspeptin is hypothesized to be a generator of the GnRH pulse. How these neuropeptides interact remains unclear.
OBJECTIVE: To probe the role of NKB in GnRH pulse generation and to determine the interactions between NKB, kisspeptin, and dynorphin in humans and mice with a complete absence of NKB.
DESIGN: Case/control.
SETTING: Academic medical center.
PARTICIPANTS: Members of a consanguineous family bearing biallelic loss-of-function mutations in the gene encoding NKB and NKB-deficient mice.
INTERVENTIONS: Frequent blood sampling to characterize neuroendocrine profile and administration of kisspeptin, GnRH, and naloxone, a nonspecific opioid receptor antagonist used to block dynorphin.
MAIN OUTCOME MEASURES: LH pulse characteristics.
RESULTS: Humans lacking NKB demonstrate slow LH pulse frequency, which can be increased by opioid antagonism. Mice lacking NKB also demonstrate impaired LH secretion, which can be augmented with an identical pharmacologic manipulation. Both mice and humans with NKB deficiency respond to exogenous kisspeptin.
CONCLUSION: The preservation of LH pulses in the absence of NKB and dynorphin signaling suggests that both peptides are dispensable for GnRH pulse generation and kisspeptin responsiveness. However, NKB and dynorphin appear to have opposing roles in the modulation of GnRH pulse frequency.
OBJECTIVE: To probe the role of NKB in GnRH pulse generation and to determine the interactions between NKB, kisspeptin, and dynorphin in humans and mice with a complete absence of NKB.
DESIGN: Case/control.
SETTING: Academic medical center.
PARTICIPANTS: Members of a consanguineous family bearing biallelic loss-of-function mutations in the gene encoding NKB and NKB-deficient mice.
INTERVENTIONS: Frequent blood sampling to characterize neuroendocrine profile and administration of kisspeptin, GnRH, and naloxone, a nonspecific opioid receptor antagonist used to block dynorphin.
MAIN OUTCOME MEASURES: LH pulse characteristics.
RESULTS: Humans lacking NKB demonstrate slow LH pulse frequency, which can be increased by opioid antagonism. Mice lacking NKB also demonstrate impaired LH secretion, which can be augmented with an identical pharmacologic manipulation. Both mice and humans with NKB deficiency respond to exogenous kisspeptin.
CONCLUSION: The preservation of LH pulses in the absence of NKB and dynorphin signaling suggests that both peptides are dispensable for GnRH pulse generation and kisspeptin responsiveness. However, NKB and dynorphin appear to have opposing roles in the modulation of GnRH pulse frequency.
Предметные рубрики MeSH
Academic Medical CentersAdolescentAdultAnimalsCase-Control StudiesChildDisease Models, AnimalDynorphinsFemaleGonadotropin-Releasing HormoneHumansHypogonadismKisspeptinsLuteinizing HormoneMiceMice, KnockoutNarcotic AntagonistsNeurokinin BNeuronsSignal TransductionSubstance PTreatment OutcomeYoung Adult