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arg-phe-amide-related peptides influence gonadotropin-releasing hormone neurons

Neural Regeneration Research 2013年第18期8卷 1714-1720页

作者： Haluk Kelestimur Emine Kacar Aysegul Uzun Mete Ozcan Selim Kutlu Department of Physiology Medical School Firat University Department of Biochemistry Medical School Karadeniz Technical University Department of Biophysics Medical School Firat University

The hypothalamic arg-phe-amide-related peptides, gonadotropin-inhibitory hormone and orthologous mammalian peptides of arg-phe-amide, may be important regulators of the hypothalamus-pituitary-gonadal reproductive axis. These peptides may modulate the effects of kisspeptins because they are presently recognized as the most potent activators of the hypothalamus-pituitary-gonadal axis. However, their effects on gonadotropin-releasing hormone neurons have not been investigated. In the current study, the GT1-7 cell line-expressing gonadotropin-releasing hormone was used as a model to explore the effects of arg-phe- amide-related peptides on kisspeptin activation. Intracellular calcium concentration was quantified using the calcium-sensitive dye, fura-2 acetoxymethyl ester. Gonadotropin-releasing hormone released into the medium was detected via enzyme-linked immunosorbent assay. Results showed that 100 nmol/L kisspeptin-10 significantly increased gonadotropin-releasing hormone levels （at 120 minutes of exposure） and intracellular calcium concentrations. Co-treatment of kisspeptin with 1 μmol/L gonadotropin-inhibitory hormone or 1 μmol/L arg-phe-amide-related peptide-1 significantly attenuated levels of kisspeptin-induced gonadotropin-releasing hormone but did not affect kisspeptin-induced elevations of intracellular calcium concentration. Overall, the results suggest that gonadotropin-inhibitory hormone and arg-phe-amide-related peptide-1 may have inhibitory effects on kisspeptin-activated gonadotropin-releasing hormone neurons independent of the calcium signaling pathway.

关键词： neural regeneration hypothalamus gonadotropin-inhibitory hormone arg-phe-amide-relatedpeptide-1 kisspeptin gonadotropin-releasing hormone calcium signaling GT1-7 cells neuroregeneration

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