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双酚-F 和双酚-S(BPF 和 BPS)损害海马中的神经干细胞的干性和神经元命运决定,导致认知功能障碍。

Bisphenol-F and Bisphenol-S (BPF and BPS) Impair the Stemness of Neural Stem Cells and Neuronal Fate Decision in the Hippocampus Leading to Cognitive Dysfunctions.

机构信息

Molecular Neurotoxicology and Cell Integrity Laboratory, Systems Toxicology and Health Risk Assessment Group, FEST Division, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhavan, 31, Mahatma Gandhi Marg, Lucknow, 226001, Uttar Pradesh (U.P.), India.

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.

出版信息

Mol Neurobiol. 2024 Nov;61(11):9347-9368. doi: 10.1007/s12035-024-04160-1. Epub 2024 Apr 18.

Abstract

Neurogenesis occurs throughout life in the hippocampus of the brain, and many environmental toxicants inhibit neural stem cell (NSC) function and neuronal generation. Bisphenol-A (BPA), an endocrine disrupter used for surface coating of plastic products causes injury in the developing and adult brain; thus, many countries have banned its usage in plastic consumer products. BPA analogs/alternatives such as bisphenol-F (BPF) and bisphenol-S (BPS) may also cause neurotoxicity; however, their effects on neurogenesis are still not known. We studied the effects of BPF and BPS exposure from gestational day 6 to postnatal day 21 on neurogenesis. We found that exposure to non-cytotoxic concentrations of BPF and BPS significantly decreased the number/size of neurospheres, BrdU (proliferating NSC marker) and MAP-2 (neuronal marker) cells and GFAP astrocytes in the hippocampus NSC culture, suggesting reduced NSC stemness and self-renewal and neuronal differentiation and increased gliogenesis. These analogs also reduced the number of BrdU/Sox-2, BrdU/Dcx, and BrdU/NeuN co-labeled cells in the hippocampus of the rat brain, suggesting decreased NSC proliferation and impaired maturation of newborn neurons. BPF and BPS treatment increases BrdU/cleaved caspase-3 cells and Bax-2 and cleaved caspase protein levels, leading to increased apoptosis in hippocampal NSCs. Transmission electron microscopy studies suggest that BPF and BPS also caused degeneration of neuronal myelin sheath, altered mitochondrial morphology, and reduced number of synapses in the hippocampus leading to altered cognitive functions. These results suggest that BPF and BPS exposure decreased the NSC pool, inhibited neurogenesis, induced apoptosis of NSCs, caused myelin degeneration/synapse degeneration, and impaired learning and memory in rats.

摘要

神经发生发生在大脑海马体的整个生命周期中,许多环境毒物会抑制神经干细胞(NSC)的功能和神经元的产生。双酚 A(BPA)是一种用于塑料产品表面涂层的内分泌干扰物,会对发育中和成年期的大脑造成损伤;因此,许多国家已经禁止其在塑料消费品中的使用。BPA 的类似物/替代品,如双酚 F(BPF)和双酚 S(BPS),也可能具有神经毒性;然而,它们对神经发生的影响仍不清楚。我们研究了从妊娠第 6 天到产后第 21 天暴露于 BPF 和 BPS 对神经发生的影响。我们发现,暴露于非细胞毒性浓度的 BPF 和 BPS 显著减少了神经球的数量/大小、BrdU(增殖 NSC 标志物)和 MAP-2(神经元标志物)细胞和 GFAP 星形胶质细胞在海马 NSC 培养物中的数量,表明 NSC 干性和自我更新以及神经元分化减少,神经胶质发生增加。这些类似物还减少了大鼠海马体中 BrdU/Sox-2、BrdU/Dcx 和 BrdU/NeuN 共标记细胞的数量,表明 NSC 增殖减少,新生神经元成熟受损。BPF 和 BPS 处理增加了 BrdU/cleaved caspase-3 细胞和 Bax-2 和 cleaved caspase 蛋白水平,导致海马 NSCs 凋亡增加。透射电子显微镜研究表明,BPF 和 BPS 还导致神经元髓鞘变性、线粒体形态改变以及海马突触数量减少,导致认知功能改变。这些结果表明,BPF 和 BPS 暴露减少了 NSC 池,抑制了神经发生,诱导了 NSCs 的凋亡,导致了髓鞘变性/突触变性,并损害了大鼠的学习和记忆能力。

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