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KNDy Neurons of the Infundibular Nucleus: Core Functions

The KNDy neurons (co-expressing Kisspeptin, Neurokinin B, and Dynorphin) of the arcuate/infundibular nucleus act as a central node controlling GnRH secretion, with roles in puberty, LH pulsatility, and — unexpectedly — thermoregulation KNDy central node review. In humans, the arcuate nucleus corresponds to the infundibular nucleus, where kisspeptin/NKB/dynorphin co-expression is conserved.

Evidence: Three Functional Roles

• Reproductive pulse generation: Ablation of ARC Kiss1 neurons in juvenile mice delays puberty in both sexes and reduces basal and pulsatile LH in adulthood, while AVPV Kiss1 neurons drive the preovulatory surge independently Obesity and KNDy gene expression study. Notably, kisspeptin from KNDy neurons appears dispensable for puberty itself but essential for female fertility and gonadotropin pulsatility KNDy hypothesis dissection preprint.
• Thermoregulation / hot flushes: In OVX rats, KNDy ablation (NK3-SAP) reduced tail-skin vasodilatation (heat loss index), implicating KNDy neurons in the estrogen modulation of body temperature and menopausal hot flush generation KNDy thermoregulation ablation study.
• Integrative hub: Viral monosynaptic tracing in Kiss1-Cre mice shows ~90% of KNDy afferents are hypothalamic (ARC, PVN, DMH, AVPV, MPON), with sexually dimorphic inputs (PeN/VMH higher in females, PaLM higher in males), supporting KNDy neurons as integrators of metabolic and external cues KNDy afferent connectome mapping.

Reported observations vs inference: The HLI reductions are reported observations in rats (n=6–11/group); the hot-flush mechanism in humans is an author-level inference requiring translation studies. Birds (Gallus gallus) lack key KNDy signaling components, so the KNDy-GnRH node is a mammalian (and partially fish) feature, not universal Avian KNDy absence study.

Confidence: Moderate-strong for rodent GnRH pulse-generator and thermoregulation roles; weaker for direct extrapolation to human infundibular nucleus physiology. Known gaps: off-target NK3-SAP effects, rabies-tracing toxicity artifacts, and species differences in NKB function NKB comparative review.