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The roles of Ca and Mg in starfish oocyte maturation induced by 1‐methyladenine by Michael P. Rosenberg; Harold H. Lee is a Environmental Science article available to read on EtoBox.

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## Abstract The ovarian hormone 1‐methyladenine (1‐MA) stimulates fully grown starfish oocytes to undergo germinal vesicle breakdown (GVB). __Patiria miniata__ oocytes treated with 10^−6^ M 1‐MA underwent GVB by 45 minutes of treatment. However, in the absence of extracellular Ca^++^ GVB was delayed, with maximum GVB occuring at 180 minutes of treatment. Both the rate and amount of^3^ H‐1‐MA bound were depressed in the absence of extracellular Ca^++^ Reflecting this decrease in hormone binding, the minimum time oocytes in CaFSW needed to be exposed to the hormone was increased from 12 to 35 minutes. Direct measurement of total cellular Ca concentrations during 1‐MA‐induced maturation revealed an increase in Ca levels by 30 minutes posttreatment, followed by a decrease to initial level by 60 minutes. In the absence of extracellular Mg^++^, oocytes treated with 1‐MA did not undergo GVB. However, binding of the hormone was not dependent on extracellular Mg^++^. Total cellular Mg concentrations were found to increase to maximum levels by 10 minutes of hormone treatment, and to decrease to basal levels after 30 minutes. Our data suggest that free‐diffusable Mg^++^ was necessary for horm

Who reads The roles of Ca and Mg in starfish oocyte maturation induced by 1‐methyladenine?

Author

Michael P. Rosenberg; Harold H. Lee

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0022-104X)

Published

1981

Language

EN

Field

Environmental Science (Life Sciences)