Isolation and characterization of a GnRH-like peptide from Octopus vulgaris

Eiko Iwakoshi, Kyoko Takuwa-Kuroda, Yuko Fujisawa, Miki Hisada, Kazuyoshi Ukena, Kazuyoshi Tsutsui, Kazuyoshi Tsutsui*


研究成果: Article査読

156 被引用数 (Scopus)


Gonadotropin-releasing hormone (GnRH) is the key peptide in the hypothalamo-hypophysial-gonadal axis, the core of regulation of reproduction in vertebrates. In this study, an octopus peptide with structural features similar to vertebrate GnRHs was isolated from brains of Octopus vulgaris. This peptide showed luteinizing hormone-releasing activity in quail anterior pituitary cells. A cDNA encoding the precursor protein was cloned. The RT-PCR transcripts were expressed in the supraesophageal and subesophageal brains, peduncle complex, and optic gland. The presence of the peptide in the different brain region was confirmed with enzyme-linked immunosorbent assay and time-of-flight mass spectrometric analysis. Immunoreactive neuronal cell bodies and fibers were observed in the subpedunculate lobe that controls the optic-gland activity. Optic gland nerves and glandular cells in the optic gland were immunostained. The isolated peptide may be octopus GnRH that contributes to octopus reproduction not only as a neurohormone but also as an endocrine hormone.

ジャーナルBiochemical and Biophysical Research Communications
出版ステータスPublished - 2002

ASJC Scopus subject areas

  • 生化学
  • 生物理学
  • 分子生物学


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