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Assessing Teratogenic Changes in a Zebrafish Model of Fetal Alcohol Exposure
Published on: March 20, 2012
Ethanol disrupts cell cycle regulation in developing rat cortex interaction with transforming growth factor beta1
Julie A Siegenthaler1, Michael W Miller
1Department of Neuroscience and Physiology, State University of New York, Upstate Medical University, Syracuse, New York 13210, USA.
Abstract:
Ethanol is a potent teratogenic agent that disrupts several aspects of neuronogenesis, including the proliferation rate of cortical precursors. With regard to corticogenesis, possible targets of ethanol toxicity include soluble factors, like transforming growth factor beta1 (TGFbeta1), that regulate cortical growth and cell cycle proteins that control the kinetics of the cell cycle. The effect of ethanol on normal cell proliferation and TGFbeta1-regulated cell proliferation in the developing cortex was assessed using an organotypic slice culture model. Ethanol elongated the cell cycle, possibly through a decrease in the expression of G1 cell cycle protein cyclin D1. Further, ethanol exposure antagonized the anti-proliferative action of TGFbeta1 and blocked TGFbeta1-dependent increases in cell cycle inhibitor p21. Collectively, this evidence suggests that disruption of appropriate cell cycle protein expression and inhibition of TGFbeta1 activity are potential mechanisms underlying the effect of ethanol on cortical development.
Insights
Ethanol exposure disrupts developing brain cell growth by altering cell cycle proteins and inhibiting transforming growth factor beta1 (TGFbeta1) signaling, impacting neuron development.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Ethanol is a known teratogen affecting fetal development.
- Cortical development involves precise regulation of neuron proliferation.
- Transforming growth factor beta1 (TGFbeta1) influences cortical growth and cell cycle dynamics.
Purpose of the Study:
- To investigate ethanol's effects on cortical precursor proliferation.
- To determine how ethanol impacts TGFbeta1-regulated cell proliferation.
- To elucidate the role of cell cycle proteins in ethanol-induced neurodevelopmental disruption.
Main Methods:
- Utilized an organotypic slice culture model of developing cortex.
- Assessed the impact of ethanol on normal and TGFbeta1-stimulated cell proliferation.
- Analyzed changes in cell cycle proteins, including cyclin D1 and p21.
Main Results:
- Ethanol exposure prolonged the cell cycle in cortical precursors.
- Ethanol decreased the expression of the G1 cell cycle protein cyclin D1.
- Ethanol antagonized TGFbeta1's anti-proliferative effects and blocked TGFbeta1-dependent p21 increases.
Conclusions:
- Ethanol disrupts cortical development by interfering with cell cycle regulation.
- Inhibition of TGFbeta1 activity is a potential mechanism for ethanol's teratogenic effects.
- Altered expression of cell cycle proteins contributes to ethanol's impact on neuronogenesis.
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