Y
Yoshitaka Oka
Researcher at University of Tokyo
Publications - 150
Citations - 5028
Yoshitaka Oka is an academic researcher from University of Tokyo. The author has contributed to research in topics: Gonadotropin-releasing hormone & Terminal nerve. The author has an hindex of 40, co-authored 145 publications receiving 4537 citations. Previous affiliations of Yoshitaka Oka include University of Oslo.
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Identification of KiSS-1 product kisspeptin and steroid-sensitive sexually dimorphic kisspeptin neurons in medaka (oryzias latipes).
Shinji Kanda,Yasuhisa Akazome,Takuya Matsunaga,Naoyuki Yamamoto,Shunji Yamada,Hiroko Tsukamura,Kei-ichiro Maeda,Yoshitaka Oka +7 more
TL;DR: It is concluded that the Medaka KiSS-1 neuronal system is involved in the central regulation of reproductive functions, and, given many experimental advantages, the medaka brain may serve as a good model system to study its physiology.
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Immunocytochemical demonstration of salmon GnRH and chicken GnRH-II in the brain of masu salmon, Oncorhynchus masou.
Masafumi Amano,Yoshitaka Oka,Katsumi Aida,Naoto Okumoto,Seiichiro Kawashima,Yoshihisa Hasegawa +5 more
TL;DR: Results showed that contents of the two GnRHs are variable among different brain regions, and the distribution of immunoreactive sGnRH and cGn RH‐II in the brain of masu salmon was examined by using immunocytochemical techniques.
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Lesions of gonadotropin-releasing hormone-immunoreactive terminal nerve cells: effects on the reproductive behavior of male dwarf gouramis.
TL;DR: These results suggest that (1) TN-GnRH cells are involved in the control of the threshold for nest-building behavior initiation and (2) TNs are not a prerequisite for other aspects of reproductive behavior in the male gouramis.
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Neurobiological mechanisms underlying GnRH pulse generation by the hypothalamus
Kei-ichiro Maeda,Satoshi Ohkura,Yoshihisa Uenoyama,Yoshihiro Wakabayashi,Yoshitaka Oka,Hiroko Tsukamura,Hiroaki Okamura +6 more
TL;DR: The present article provides a brief historical background to the work that led to the concept of the GnRH pulse generator, and proposes that kisspeptin neurons in the arcuate nucleus are key players in this regard.
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Gonadotropin-releasing hormone (GnRH)-immunoreactive terminal nerve cells have intrinsic rhythmicity and project widely in the brain
Yoshitaka Oka,Toshiya Matsushima +1 more
TL;DR: A whole-brain in vitro preparation is used to examine the spontaneous electrical activities of TN-GnRH cells and to determine the morphology of individual cells by intracellular injections of either neurobiotin or biocytin, proposing a hypothesis that may be relevant to the peptidergic and monoaminergic neuromodulatory systems in general.