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Abstract Title:

Developmental exposure of bisphenol A induces spatial memory deficits by weakening the excitatory neural circuits of CA3-CA1 and EC-CA1 in mice.

Abstract Source:

Toxicol Appl Pharmacol. 2021 Jul 7 ;426:115641. Epub 2021 Jul 7. PMID: 34242568

Abstract Author(s):

Nanxi Bi, Jinjun Ding, Rongxin Zou, Xiaozhen Gu, Zhi-Hua Liu, Hui-Li Wang

Article Affiliation:

Nanxi Bi

Abstract:

Bisphenol-A (BPA) is an environmental endocrine disruptor and impairs learning and memory. However, the direct evidence for BPA exposure affecting neural circuits has been limited. In this study, a virus tracing assay has been established to explore the brain's neural circuits. Thy1-Cre mice were used to investigate the effects of BPA on the neural projection of glutamatergic pyramidal neurons in hippocampal CA1 based on Thy1 promoter. These transgenic mice were orally exposed to BPA (0, 0.5 mg/kg/day) from postnatal day (PND) 0 to PND60 and then subjected to behavioral tests. Morris water maze(MWM)and Barnes maze's showed that the spatial memory was seriously impaired in BPA exposed Thy1-Cre mice. Virus tracing assay indicated that CA1 pyramidal neurons mainly received neural inputsfrom hippocampal CA3, entorhinal cortex (EC), and medial septum (MS). The analysis showed that BPA reduced the number of RVneurons in CA3 and EC but not MS. The immunohistochemistry experiment displayed that BPA decreased the percentage of CaMKIIcells in CA3 and EC. The results demonstrated that the synaptic connection of upstream glutamatergic neurons and CA1 pyramidal cells was weakened by BPA exposure. These point to potentially detrimental effects of BPA exposure on the excitatory neural circuit of CA3-CA1 and EC-CA1 in memory formation. Thus, our findings revealed that the decrease in excitatory neural circuits of CA3-CA1 and EC-CA1 contribute to the BPA-induced spatial memory deficits in Thy1-Cre mice.

Study Type : Animal Study
Additional Links
Adverse Pharmacological Actions : Neurotoxic : CK(2715) : AC(657)

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