Gonad Response to Calcium and a Comparison of the Effects of Calcium, Potassium, Acetylcholine and γ-Aminobutyric Acid on the Sea Urchin Gonad : Physiology

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概要

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• Gonad response to calcium and the effects of calcium, potassium, acetylcholine (ACh) and γ-aminobutyric acid (GABA) on the gonads of the sea urchin, Strongylocentrotus intermedius were studied on the basis of measurements of the potential difference (PD). Rhythmical contraction due to Ca^<2+> occurred at a concentration exceeding 50mM and its frequency increased as the concentration rose above this. In mature gonads, rhythmical contraction lasted for over an hour. Among four stimuli, ACh initiated threshold-contraction at the lowest concentration, 10^<-8> or 10^<-7>M. In relative response (RR) indicating the PD of a certain stimulation against that of 500mM K^+, the RR of GABA and K^+ reached 1.0 but Ca^<2+> and ACh saturated near 0.8. Ca^<2+> and GABA induced both rhyihmical and smooth phasic contraction while K^+ and ACh, only smooth long lasting contraction. The response to 50mM K^+ and 50mM Ca^<2+> persisted for more than an hour but that toward 2mM GABA and 2mM ACh, only about 20min.

• 社団法人日本動物学会の論文
• 1987-06-15

著者

• Takahashi S

  Marine Biomedical Institute Sapporo Medical University School Of Medicine

• TAKAHASHI Nobuaki

  Marine Biomedical Institute

• TAKAHASHI MASAKI

  Marine Biomedical Institute, Sapporo Medical College

• Takahashi M

  Univ. Tokyo

• Takahashi Masaki

  Marine Biomedical Institute Sapporo Medical College

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