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Release of a Gonad‐Stimulating Substance from the Radial Nerves of the Cushion Star, Asterina pectinifera , in response to Excess Potassium *
Author(s) -
TAKAHASHI NOBUAKI
Publication year - 1985
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1985.00447.x
Subject(s) - radial nerve , stimulation , gonad , potassium , medicine , endocrinology , cushion , chemistry , anatomy , biology , organic chemistry , mechanical engineering , engineering
The release of a gonad‐stimulating substance (GSS) from radial nerves stimulated by a K + ‐rich solution was examined in the cushion star, Asterina pectinifera. The threshold concentration of K + necessary for the release of a sufficient amount of GSS to induce shedding of mature oocytes from ovarian fragments was 50 to 75 mM. The minimal amount of fresh nerve required for this release was 3 mg per ml of medium. The time of K + stimulation necessary to induce maximal GSS release was about 20 min. Repeated stimulations of radial nerves with 100 mM K + caused repeated release of GSS.