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Here, deletion of the prolactin receptor (Prlr) from forebrain neurons or arcuate kisspeptin neurons resulted in failure to maintain normal lactation-induced suppression of estrous cycles. Kisspeptin immunoreactivity and pulsatile LH secretion were increased in these mice, even in the presence of ongoing suckling stimulation and lactation. GCaMP fibre photometry of arcuate kisspeptin neurons revealed that the normal episodic activity of these neurons is rapidly suppressed in pregnancy and this was maintained throughout early lactation. Deletion of Prlr from arcuate kisspeptin neurons resulted in early reactivation of episodic activity of kisspeptin neurons prior to a premature return of reproductive cycles in early lactation. These observations show dynamic variation in arcuate kisspeptin neuronal activity associated with the hormonal changes of pregnancy and lactation, and provide direct evidence that prolactin action on arcuate kisspeptin neurons is necessary for suppressing fertility during lactation in mice.<\/jats:p>","DOI":"10.7554\/elife.94570","type":"journal-article","created":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T06:25:58Z","timestamp":1710829558000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.94570","source":"Crossref","is-referenced-by-count":12,"title":["Prolactin-mediates a lactation-induced suppression of arcuate kisspeptin neuronal activity necessary for lactational infertility in mice"],"prefix":"10.7554","volume":"13","author":[{"given":"Eleni CR","family":"Hackwell","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01jmxt844","id-type":"ROR","asserted-by":"publisher"}],"name":"Centre for Neuroendocrinology, School of Biomedical Sciences, University of 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