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  • Title: Kisspeptin: beyond the brain.
    Author: Bhattacharya M, Babwah AV.
    Journal: Endocrinology; 2015 Apr; 156(4):1218-27. PubMed ID: 25590245.
    Abstract:
    The hypothalamic-based kisspeptin-signaling system is a major positive regulator of the neuroendocrine-reproductive axis in mammals. During the last decade, major advances have been made in understanding how this signaling system is regulated and how it can be manipulated clinically to achieve beneficial outcomes in treating sex steroid-dependent disorders. Interestingly, kisspeptin was not first identified as a regulator of fertility. Instead, approximately 7 years earlier KISS1 was reported to be expressed in nonmetastatic melanoma cells and was subsequently demonstrated to act as a powerful suppressor of the metastatic potential of malignant melanoma cells. Since this discovery, numerous studies have demonstrated the expression of the kisspeptin-signaling system at several peripheral sites implicating it in biological processes such as the regulation of ovarian function, embryo implantation, placentation, angiogenesis, insulin secretion, and kidney development. Although much work remains to be done to assess how important kisspeptin signaling is in regulating some of these processes, for other processes recent studies have made tremendous strides toward such an assessment. Using mice lacking either Kiss1 or Kiss1r alleles, researchers have provided compelling evidence for kisspeptin playing a major role in regulating breast cancer metastasis, oocyte survival, follicular maturation, ovulation, and embryo implantation. This review critically discusses the findings from these as well as other studies which suggest roles for kisspeptin in regulating important physiological processes beyond the brain. It also discusses the challenges that lie ahead in determining whether findings made with animal models are relevant in humans.
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