Chronic Peripheral Administration of Kappa-Opioid Receptor Antagonist Advances Puberty Onset Associated with Acceleration of Pulsatile Luteinizing Hormone Secretion in Female Rats

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Author(s)

    • MAEDA Kei-ichiro
    • Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
    • TSUKAMURA Hiroko
    • Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
    • UENOYAMA Yoshihisa
    • Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
    • IWASE Akira
    • Graduate School of Medicine, Nagoya University, Nagoya 466-8550, Japan
    • OISHI Shinya
    • Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, Japan
    • NAKAMURA Sho
    • Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
    • MINABE Shiori
    • Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
    • WATANABE Youki
    • Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
    • DEURA Chikaya
    • Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
    • NOGUCHI Taro
    • Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, Japan

Abstract

Puberty in mammals is timed by an increase in gonadotropin-releasing hormone (GnRH) secretion. Previous studies have shown involvement of the two neuropeptides, kisspeptin and neurokinin B (NKB), in controlling puberty onset. Little is known about the role of the other key neuropeptide, dynorphin, in controlling puberty onset, although these three neuropeptides colocalize in the arcuate kisspeptin neurons. The arcuate kisspeptin neuron, which is also referred to as the KNDy neuron, has recently been considered to play a role as an intrinsic source of the GnRH pulse generator. The present study aimed to determine if attenuation of inhibitory dynorphin-kappa-opioid receptor (KOR) signaling triggers the initiation of puberty in normal developing female rats. The present study also determined if stimulatory NKB-neurokinin 3 receptor (NK3R) signaling advances puberty onset. Female Wistar-Imamichi rats were weaned and intraperitoneally implanted with osmotic minipumps filled with nor-binaltorphimine (nor-BNI), a KOR antagonist, or senktide, a NK3R agonist, at 20 days of age. Fourteen days of intraperitoneal infusion of nor-BNI or senktide advanced puberty onset, manifested as vaginal opening and the first vaginal estrus in female rats. Frequent blood sampling showed that nor-BNI significantly increased luteinizing hormone (LH) pulse frequency at 29 days of age compared with vehicle-treated controls. Senktide tended to increase this frequency, but its effect was not statistically significant. The present results suggest that the inhibitory input of dynorphin-KOR signaling plays a role in the prepubertal restraint of GnRH/LH secretion in normal developing female rats and that attenuation of dynorphin-KOR signaling and increase in NKB-NK3R signaling trigger the onset of puberty in female rats.

Journal

  • Journal of Reproduction and Development

    Journal of Reproduction and Development 59(5), 479-484, 2013

    THE SOCIETY FOR REPRODUCTION AND DEVELOPMENT

Codes

  • NII Article ID (NAID)
    130003361050
  • NII NACSIS-CAT ID (NCID)
    AA10936678
  • Text Lang
    ENG
  • ISSN
    0916-8818
  • NDL Article ID
    024943104
  • NDL Call No.
    Z54-H305
  • Data Source
    NDL  J-STAGE 
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