陆军军医大学(第三军医大学)军队劳动卫生学教研室,电磁辐射医学防护教育部重点实验室,重庆
Received:22 May 2025,
Revised:2025-09-05,
Accepted:08 September 2025,
Published:15 October 2025
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揭晟,田蕊,曲育辰,等.PCBP1调控铁稳态抑制铁死亡对抗镉神经毒性的作用研究[J].陆军军医大学学报,2025,47(19):2315-2326.DOI:10.16016/j.2097-0927.202505051.
JIE S,TIAN R,QU Y C,et al.PCBP1-mediated regulation of iron homeostasis suppresses ferroptosis against cadmium-induced neurotoxicity in mouse neuroblastoma cells[J].J Army Med Univ,2025,47(19):2315-2326.DOI:10.16016/j.2097-0927.202505051.
揭晟,田蕊,曲育辰,等.PCBP1调控铁稳态抑制铁死亡对抗镉神经毒性的作用研究[J].陆军军医大学学报,2025,47(19):2315-2326.DOI:10.16016/j.2097-0927.202505051. DOI:
JIE S,TIAN R,QU Y C,et al.PCBP1-mediated regulation of iron homeostasis suppresses ferroptosis against cadmium-induced neurotoxicity in mouse neuroblastoma cells[J].J Army Med Univ,2025,47(19):2315-2326.DOI:10.16016/j.2097-0927.202505051. DOI:
目的
2
探讨聚(rC)结合蛋白1 [Poly(rC)-binding protein 1,PCBP1]在镉(Cadmium,Cd)诱导小鼠神经细胞Neuro-2a(N2A)铁死亡中的作用。
方法
2
以N2A细胞构建浓度梯度(0、1、2、4 μmol/L)CdCl₂体外暴露模型(72 h)。通过台盼蓝染色检测细胞存活率,Western blot分析铁死亡相关蛋白(GPX4、HMOX1、ACSL4)及PCBP1表达。以FerroOrange和BODIPY
581/591
C11 探针检测胞内Fe²⁺和脂质过氧化水平。应用铁死亡抑制剂Fer-1明确铁死亡在镉暴露抑制N2A细胞存活率中的重要作用。以分子对接技术解析PCBP1与铁蛋白的互作模式及与Cd²⁺的结合位点。进一步构建PCBP1过表达质粒验证其重要作用及功能。
结果
2
镉暴露以剂量依赖性方式抑制细胞存活率(
P<
0.01),显著下调GPX4表达水平(
P<
0.05),上调HMOX1表达水平(
P<
0.01),诱导Fe²⁺过量蓄积及脂质过氧化水平显著增加(
P<
0.01)。分子对接揭示,Cd²⁺可直接结合PCBP1的KH2结构域,并且可共同结合于铁蛋白重链外侧。过表达PCBP1可明显逆转镉暴露诱导的Fe²⁺蓄积、GPX4表达下调、过氧化脂质增加及细胞存活率下降。
结论
2
镉暴露通过抑制PCBP1表达及以金属离子竞争扰乱PCBP1介导的铁稳态网络,协同驱动Fe²⁺超载触发铁死亡级联反应,最终导致神经毒性。靶向PCBP1介导的铁稳态可有效抑制铁死亡,为干预镉神经毒性提供新策略。
Objective
2
To investigate the role of poly(rC)-binding protein 1 (PCBP1) in cadmium (Cd)-induced ferroptosis in mouse neuroblastoma Neuro-2a (N2A) cells.
Methods
2
N2A cells were exposed to a concentration gradient of CdCl₂ (0
1
2
4 μmol/L) for 72 h. Cell viability was assessed by trypan blue staining. Western blotting was employed to detect the expression of ferroptosis-related proteins (GPX4
HMOX1
ACSL4) and PCBP1. Intracellular Fe²⁺ level and lipid peroxidation were detected using FerroOrange and BODIPY
581/591
C11 probes
respectively. Ferrostatin-1 (Fer-1)
a ferroptosis inhibitor
was applied to confirm the critical role of ferroptosis in Cd-induced cytotoxicity. Molecular docking was performed to elucidate the interaction between PCBP1 and ferritin
as well as the binding sites of Cd²⁺. PCBP1 overexpression plasmid was further constructed for functional validation.
Results
2
Cd exposure suppressed cell
viability in N2A cells in a dose-dependent manner (
P
<
0.01)
significantly down-regulated GPX4 expression (
P
<
0.05)
up-regulated HMOX1 expression (
P
<
0.01)
and induced Fe²⁺ overload and lipid peroxidation (
P
<
0.01). Molecular docking revealed that Cd²⁺ directly bound to the KH2 domain of PCBP1 and then co-localized on the outer surface of ferritin heavy chain. Overexpression of PCBP1 markedly reversed Cd-induced Fe²⁺ accumulation
GPX4 down-regulation
lipid peroxidation
and cell death.
Conclusion
2
Cd exposure disrupts PCBP1-mediated iron homeostasis
via
transcriptional suppression and competitive displacement of metal ions
and then synergistically drives Fe²⁺ overload-triggered ferroptosis cascades
ultimately leading to neurotoxicity. Targeting PCBP1-mediated iron homeostasis can effectively mitigate Cd-induced neurotoxicity
and may serve as a novel therapeutic strategy.
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