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Long-term Recordings of Arcuate Nucleus Kisspeptin Neurons Across the Mouse Estrous Cycle.

Authors :
Vas S
Wall E
Zhou Z
Kalmar L
Han SY
Herbison AE
Source :
Endocrinology [Endocrinology] 2024 Jan 16; Vol. 165 (3).
Publication Year :
2024

Abstract

The arcuate nucleus kisspeptin (ARNKISS) neurons represent the GnRH pulse generator that likely drives pulsatile gonadotropin secretion in all mammals. Using an improved GCaMP fiber photometry system enabling long-term continuous recordings, we aimed to establish a definitive profile of ARNKISS neuronal activity across the murine estrous cycle. As noted previously, a substantial reduction in the frequency of ARNKISS neuron synchronization events (SEs) occurs on late proestrus and extends into estrus. The SE amplitude remains constant throughout the cycle. During metestrus, we unexpectedly detected many multipeak SEs where many SEs occurred rapidly, within 160 seconds of each other. By applying a machine learning-based, k-means clustering analysis, we were further able to detect substantial within-stage variability in the patterns of pulse generator activity. Estrous cycle-dependent changes in SE activity occurred around the time of lights on and off. We also find that a mild stressor such as vaginal lavage reduces ARNKISS neuron SE frequency for up to 3 hours. These observations provide a comprehensive account of ARNKISS neuron activity across the estrous cycle, highlight a new pattern of multipeak SE activity, and introduce a new k-means clustering approach for analyzing ARNKISS neuron population behavior.<br /> (© The Author(s) 2024. Published by Oxford University Press on behalf of the Endocrine Society.)

Details

Language :
English
ISSN :
1945-7170
Volume :
165
Issue :
3
Database :
MEDLINE
Journal :
Endocrinology
Publication Type :
Academic Journal
Accession number :
38279940
Full Text :
https://doi.org/10.1210/endocr/bqae009