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Endocrine Signaling01:45

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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Using Tg(Vtg1:mcherry) Zebrafish Embryos to Test the Estrogenic Effects of Endocrine Disrupting Compounds
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Endocrine disruption in aquatic vertebrates.

Werner Kloas1, Ralph Urbatzka, Robert Opitz

  • 1Department of Endocrinology, Institute of Biology, Humboldt University, Berlin, Germany. werner.kloas@igb-berlin.de

Annals of the New York Academy of Sciences
|May 22, 2009
PubMed
Summary

Environmental endocrine disruptors (ED) in surface waters threaten aquatic wildlife. These compounds interfere with reproductive and thyroid systems, impacting sexual differentiation and reproduction in fish and amphibians.

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Area of Science:

  • Environmental toxicology
  • Endocrinology
  • Aquatic ecotoxicology

Background:

  • Surface waters act as a sink for endocrine-disrupting compounds (ED).
  • Aquatic vertebrates, including fish and amphibians, are particularly vulnerable to ED.
  • ED can disrupt reproductive biology and thyroid function through various modes of action.

Purpose of the Study:

  • To review the impact of environmental endocrine disruptors on aquatic vertebrates.
  • To highlight the mechanisms of action of ED, including effects on sex steroid receptors and the thyroid system.
  • To discuss emerging sources of ED and their ecotoxicological implications.

Main Methods:

  • Literature review of environmental toxicology and ecotoxicology studies.
  • Analysis of ED modes of action, focusing on estrogenic, androgenic, and thyroidal pathways.
  • Examination of effects on sexual differentiation and reproduction in fish and amphibians.

Main Results:

  • ED interfere with sex steroid receptors, leading to abnormal sexual differentiation and impaired reproduction.
  • Amphibian metamorphosis is a sensitive model for detecting thyroidal ED, though a fish model is lacking.
  • Both anthropogenic and natural sources contribute to ED contamination, affecting aquatic life.

Conclusions:

  • ED pose a significant threat to aquatic vertebrate endocrine systems, impacting reproduction and development.
  • The interconnectedness of endocrine systems means widespread deregulation can occur.
  • Pharmaceutically active compounds (PhACs) represent a growing concern for endocrine disruption in aquatic environments.