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Assessment of the Effects of Endocrine Disrupting Compounds on the Development of Vertebrate Neural Network Function Using Multi-electrode Arrays
Published on: April 26, 2018
In vitro effects of bisphenol A on developing hypothalamic neurons
Takashi Iwakura1, Makiko Iwafuchi, Daisuke Muraoka
1Department of Life Sciences, Toyo University, 1-1-1 Itakura, Oura, Gunma 374-0193, Japan.
Toxicology
|April 20, 2010
Summary
Bisphenol A (BPA) enhances neuronal development in the hypothalamus by affecting synapsin I and MAP2. These effects involve distinct molecular pathways, suggesting complex impacts on brain development.
Area of Science:
- Neuroendocrinology
- Developmental Neuroscience
- Environmental Toxicology
Background:
- Estradiol is crucial for sexual differentiation of the rodent hypothalamus.
- Estrogenic endocrine disruptors like bisphenol A (BPA) can disrupt this process.
- Understanding BPA's in vitro effects on developing neurons is important.
Purpose of the Study:
- To investigate the in vitro effects of BPA on developing hypothalamic neurons.
- To examine BPA's impact on the presynaptic protein synapsin I and microtubule-associated protein 2 (MAP2).
Main Methods:
- Primary cultures of fetal rat hypothalamic cells were treated with BPA.
- Effects on synapsin I and MAP2 were assessed using immunofluorescence.
- Involvement of estrogen receptor (ER) and ERK pathways was investigated using antagonists/inhibitors.
Main Results:
- BPA treatment enhanced dendritic and synaptic development, indicated by increased MAP2 and synapsin I staining.
- An ER antagonist partially blocked BPA's effect on synapsin I but suppressed the MAP2 increase.
- An ERK inhibitor reduced synapsin I staining without affecting MAP2; BPA decreased phosphorylated synapsin I levels.
Conclusions:
- BPA influences hypothalamic neuronal development through distinct molecular pathways.
- ER and ERK signaling mediate different aspects of BPA's effects on synapsin I and MAP2.
- These findings highlight the complex mechanisms by which endocrine disruptors impact brain development.
