Environmental antiecdysteroids alter embryo development in the crustacean Daphnia magna

Wiley - Tập 292 Số 3 - Trang 287-292 - 2002
Xueyan Mu1, Gerald A. LeBlanc2
1Department of Environmental & Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695-7633
2Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695‐7633

Tóm tắt

Abstract

The role of ecdysteroids in crustacean embryo development and the susceptibility of the developing embryo to the antiecdysteroidal properties of an environmental chemical were evaluated. The agricultural fungicide fenarimol was shown to exhibit antiecdysteroidal activity to the crustacean Daphnia magna by lowering endogenous ecdysone levels and delaying molting in a concentration‐dependent fashion that was mitigated by co‐exposure to exogenous 20‐hydroxyecdysone. Exposure of either gravid maternal organisms or isolated embryos to fenarimol resulted in embryo abnormalities ranging from early partial developmental arrest to incomplete development of antennae and shell spines. Developmental abnormalities were associated with suppressed ecdysone levels in the embryos and the abnormalities could be prevented by co‐exposure to 20‐hydroxyecdysone. Developmental abnormalities caused by the antiecdysteroid were associated with reduced fecundity of the parental organisms. These results demonstrate that ecdysteroids are critical to normal crustacean embryo development and environmental antiecdysteroids can disrupt normal embryo development and compromise the production of viable offspring. Antiecdysteroidal activity may provide a means by which environmental chemicals impact crustacean species while not affecting vertebrates. J. Exp. Zool. 292:287–292, 2002. © 2002 Wiley‐Liss, Inc.

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Wiley

Tập 292 Số 3

287-292

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