Developmental programming and endocrine disruptor effects on reproductive neuroendocrine systems
1Division of Pharmacology and Toxicology, Institute for Neuroscience and Institute for Cellular and Molecular Biology, The University of Texas at Austin, 1 University Station A1915, Austin, TX 78712, USA. andrea.gore@mail.utexas.edu
Frontiers in Neuroendocrinology
|April 9, 2008
Summary
Early life exposure to endocrine-disrupting chemicals (EDCs) can disrupt reproductive neuroendocrine system development, impacting fertility. These epigenetic changes may even affect future generations.
Area of Science:
- Reproductive neuroendocrinology
- Developmental biology
- Environmental toxicology
Background:
- Successful reproduction hinges on precise developmental programming, especially during embryonic and early postnatal stages.
- Gonadal steroid hormones imprint sexually differentiated hypothalamic brain regions, influencing adult reproductive function.
- Aberrant exposure to endocrine-disrupting chemicals (EDCs) can interfere with this programming.
Purpose of the Study:
- To review evidence on how gonadal steroids and EDCs affect hypothalamic development and reproductive success.
- To explore the mechanisms, including epigenetic modifications, underlying these effects.
- To discuss the implications for understanding normal development and potential interventions.
Main Methods:
- Review of existing scientific literature on hormonal imprinting and endocrine disruption.
- Examination of evidence for non-genomic, epigenetic mechanisms (DNA methylation, histone acetylation).
- Analysis of transgenerational effects via germline transmission.
Main Results:
- Gonadal steroids critically influence hypothalamic morphology and adult reproductive function.
- Early exposure to EDCs can lead to improper hypothalamic programming and reduced reproductive success.
- Epigenetic mechanisms, including DNA methylation and histone acetylation, mediate EDC effects on gene expression.
- Transgenerational epigenetic inheritance is a potential consequence of germline exposure.
Conclusions:
- Understanding the impact of natural hormones and xenobiotics on the reproductive neuroendocrine system is crucial.
- Early life exposures to EDCs pose a significant risk to reproductive health.
- Epigenetic mechanisms offer insights into developmental disruption and potential therapeutic targets.
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