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Kisspeptin-10 potentiates miniature excitatory postsynaptic currents in the rat supraoptic nucleus

2014; Elsevier BV; Volume: 1583; Linguagem: Inglês

10.1016/j.brainres.2014.08.020

1872-6240

Tōru Yokoyama, Kouichiro Minami, Kiyoshi Terawaki, Kanako Miyano, Junichi Ogata, Takashi Maruyama, Mamoru Takeuchi, Yasuhito Uezono, Yoichi Ueta,

Neuropeptides and Animal Physiology

Kisspeptin is the natural ligand of the G protein-coupled receptor -54 and plays a major role in gonadotropin-releasing hormone secretion in the hypothalamus. Kisspeptin-10 is an endogenous derivative of kisspeptin and has 10 -amino acids. Previous studies have demonstrated that central administration of kisspeptin-10 stimulates the secretion of arginine vasopressin (AVP) in male rats. We examined the effects of kisspeptin-10 on- excitatory synaptic inputs to magnocellular neurosecretory cells (MNCs) including AVP neurons in the supraoptic nucleus (SON) by obtaining in vitro whole-cell patch-clamp recordings from slice preparations of the rat brain. The application of kisspeptin-10 (100 nM–1 μM) significantly increased the frequency of miniature excitatory postsynaptic currents (mEPSCs) in a dose-related manner without affecting the amplitude. The kisspeptin-10-induced potentiation of the mEPSCs was significantly attenuated by previous exposure to the kisspeptin receptor antagonist kisspeptin-234 (100 nM) and to the protein kinase C inhibitor bisindolylmaleimide I (20 nM). These results suggest that kisspeptin-10 participates in the regulation of synaptic inputs to the MNCs in the SON by interacting with the kisspeptin receptor.