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Distribution of free and conjugated ecdysteroids between follicle cell sheath and ooplasm in oocytes of the cockroachNauphoeta cinerea

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Summary

It is shown that both follicle cell sheath and ooplasm contain only small quantities ofHelix-hydrolyzable ecdysteroid conjugates and that 20-hydroxy-ecdysone is the predominant free ecdysteroid. Its concentration is very high in the follicle cell sheath immediately before chorion formation (6825 ng/g) and much lower after chorion formation (150 ng/g), while it is 234 ng/g and 95 ng/g in the ooplasm at the same stages respectively.

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Authors and Affiliations

  1. Division of Animal Physiology, Zoological Institute, University of Bern, Erlachstrasse 9a, CH-3012, Bern, Switzerland

    X. X. Zhu & B. Lanzrein

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  1. X. X. Zhu
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  2. B. Lanzrein
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Additional information

Thanks are due to Dr J.D. O'Connor (Los Angeles) for the ecdysone antiserum, to Dr J. Koolman (Marburg) for 23,24-[3H]-ecdysone and to Mrs A. Tschan for technical assistance. A fellowship to X. Zhu from the Chinese Ministry of Education and financial support from the Swiss National Science Foundation (grant no. 3.714-0.80 to B. Lanzrein) are gratefully acknowledged.

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Zhu, X.X., Lanzrein, B. Distribution of free and conjugated ecdysteroids between follicle cell sheath and ooplasm in oocytes of the cockroachNauphoeta cinerea. Experientia 40, 496–498 (1984). https://doi.org/10.1007/BF01952404

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