Endocrine Disruptors: What are they, and why should we care? httpwww.usgs.govthemesFS-189-97.

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Presentation transcript:

Endocrine Disruptors: What are they, and why should we care? httpwww.usgs.govthemesFS

The Endocrine System Hormones secreted into bloodstream from glands Conveys information throughout body Regulates metabolism, growth, reproduction, immune function, etc.

Examples of Human Hormones Testosterone Estrogen Growth hormone Insulin Thyroxine Adrenaline

Hormone Receptors Each hormone molecule fits a specific receptor protein Different cells, organs, have different receptors Hormones can target specific cells, organs via these receptors

Hormones target specific cells via their receptors

Different cells have different receptors

Endocrine disruptors: Molecules that interfere with endocrine system Naturally occurring or man-made Enter organisms via air, water, diet, skin Can cause problems with an organisms development, reproduction, immune system, etc.

Effects of Endocrine Disruptors Intersex characteristics: both male and female characteristics are present in the same fish; feminization of males Abnormal breeding cycles Impaired immune systems

Cellular growth/tumors Abnormal development

Sources of Endocrine Disruptors: Drugs/medicines Pesticides Plasticizers Consumer products (plastic bottles, metal cans, detergents, cosmetics, toys, food)

Examples of Endocrine Disruptors DDT PCBs (polychlorinated biphenyls) BPA (bisphenol A) Phthalates

Dealing with Endocrine Disruptors Prevent exposure (laws, policy-making) Remove contaminants ???

Endocrine Disruptors and Frogs Limb development pdf/wildlife/r827398_gardiner final.pdf