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Sex-specific pubertal and metabolic regulation of Kiss1 neurons via Nhlh2. | LitMetric

AI Article Synopsis

Article Abstract

Hypothalamic Kiss1 neurons control gonadotropin-releasing hormone release through the secretion of kisspeptin. Kiss1 neurons serve as a nodal center that conveys essential regulatory cues for the attainment and maintenance of reproductive function. Despite this critical role, the mechanisms that control kisspeptin synthesis and release remain largely unknown. Using Drop-Seq data from the arcuate nucleus of adult mice and in situ hybridization, we identified Nescient Helix-Loop-Helix 2 (), a transcription factor of the basic helix-loop-helix family, to be enriched in Kiss1 neurons. JASPAR analysis revealed several binding sites for NHLH2 in the and (neurokinin B) 5' regulatory regions. In vitro luciferase assays evidenced a robust stimulatory action of NHLH2 on human and promoters. The recruitment of NHLH2 to the and promoters was further confirmed through chromatin immunoprecipitation. In vivo conditional ablation of from Kiss1 neurons using : mice induced a male-specific delay in puberty onset, in line with a decrease in arcuate expression. Females retained normal reproductive function albeit with irregular estrous cycles. Further analysis of male mice revealed higher susceptibility to metabolic challenges in the release of luteinizing hormone and impaired response to leptin. Overall, in Kiss1 neurons, Nhlh2 contributes to the metabolic regulation of kisspeptin and NKB synthesis and release, with implications for the timing of puberty onset and regulation of fertility in male mice.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8439651PMC
http://dx.doi.org/10.7554/eLife.69765DOI Listing

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