Neural Regeneration Research ›› 2013, Vol. 8 ›› Issue (2): 162-168.doi: 10.3969/j.issn.1673-5374.2013.02.009

Previous Articles     Next Articles

Kisspeptin regulates gonadotropin-releasing hormone secretion in gonadotropin-releasing hormone/enhanced green fluorescent protein transgenic rats

Haogang Xue, Chunying Yang, Xiaodong Ge, Weiqi Sun, Chun Li, Mingyu Qi   

  1. Department of Orthopedic Surgery, First Clinical Hospital, Beihua University, Jilin 132011, Jilin Province, China
  • Received:2012-07-02 Revised:2012-11-13 Online:2013-01-15 Published:2013-01-15
  • Contact: Chunying Yang, Ph.D., Professor, Department of Orthopedic Surgery, First Clinical Hospital, Beihua University, Jilin 132011, Jilin Province, China,yjjalw2009@126.com.
  • About author:Haogang Xue☆, Ph.D., Chief physician.

Abstract:

Kisspeptin is essential for activation of the hypothalamo-pituitary-gonadal axis. In this study, we established gonadotropin-releasing hormone/enhanced green fluorescent protein transgenic rats. Rats were injected with 1, 10, or 100 pM kisspeptin-10, a peptide derived from full-length kisspeptin, into the arcuate nucleus and medial preoptic area, and with the kisspeptin antagonist peptide 234 into the lateral cerebral ventricle. The results of immunohistochemical staining revealed that pulsatile luteinizing hormone secretion was suppressed after injection of antagonist peptide 234 into the lateral cerebral ventricle, and a significant increase in luteinizing hormone level was observed after kisspeptin-10 injection into the arcuate nucleus and medial preoptic area. The results of an enzyme-linked immunosorbent assay showed that luteinizing hormone levels during the first hour of kisspeptin-10 infusion into the arcuate nucleus were significantly greater in the 100 pM kisspeptin-10 group than in the 10 pM kisspeptin-10 group. These findings indicate that kisspeptin directly promotes gonadotropin-releasing hormone secretion and luteinizing hormone release in gonadotropin-releasing hormone/enhanced green fluorescent protein transgenic rats. The arcuate nucleus is a key component of the kisspeptin-G protein-coupled receptor 54 signaling pathway underlying regulating luteinizing hormone pulse secretion.

Key words: neural regeneration, basic research, gonadotropin-releasing hormone, enhanced green fluorescent protein, transgenic, luteinizing hormone, G protein-coupled receptor 54, medial preoptic area, arcuate nucleus, anteroventral periventricular nucleus, organum vasculosum of the lamina terminalis, photographs-containing paper, neuroregeneration