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Mitochondrial ferritin suppresses MPTP-induced cell damage by regulating iron metabolism and attenuating oxidative
Lin-Hao You1, Zhen Li1, Xiang-Lin Duan1
1Laboratory of Molecular Iron Metabolism, College of Life Science, Hebei Normal University, Shijiazhuang 050016, Hebei Province, China.
Abstract:
Our previous work showed that mitochondrial ferritin (MtFt) played an important role in preventing neuronal damage in 6-OHDA-induced Parkinson's disease (PD). However, the role of MtFt in a PD model induced by MPTP is not clear. Here, we found that methyl-4-phenyl-1, 2, 3, 6-tetra-pyridine (MPTP) significantly upregulated MtFt in the mouse hippocampus, substantia nigra (SN) and striatum. To explore the effect of MtFt upregulation on the MPTP-mediated injury to neural cells, MtFt-/- mice and MtFt-overexpressing cells were used to construct models of PD induced by MPTP. Our results showed that MPTP dramatically downregulated expression of transferrin receptor 1 (TfR1) and tyrosine hydroxylase and upregulated L-ferritin expression in the mouse striatum and SN. Interestingly, MPTP induced high levels of MtFt in these tissues, indicating that MtFt was involved in iron metabolism and influenced dopamine synthesis induced by MPTP. Meanwhile, the Bcl2/Bax ratio was decreased significantly by MPTP in the striatum and SN of MtFt knockout (MtFt-/-) mice compared with controls. Overexpression of MtFt increased TfR1 and decreased ferroportin 1 induced by 1-methyl-4-phenylpyridinium ions (MPP+). MtFt strongly inhibited mitochondrial damage through maintaining the mitochondrial membrane potential and protecting the integrity of the mitochondrial membrane. It also suppressed the increase of the labile iron pool, decreased production of reactive oxygen species and dramatically rescued the apoptosis induced by MPP+. In conclusion, this study demonstrates that MtFt plays an important role in preventing neuronal damage in the MPTP-induced parkinsonian phenotype by inhibiting cellular iron accumulation and subsequent oxidative stress.
Insights
Mitochondrial ferritin (MtFt) protects against MPTP-induced Parkinson's disease by reducing iron accumulation and oxidative stress, preserving neuronal integrity.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Mitochondrial ferritin (MtFt) is known to protect against 6-OHDA-induced Parkinson's disease (PD).
- The role of MtFt in MPTP-induced PD models remains unclear.
- MPTP is a common neurotoxin used to model Parkinson's disease.
Purpose of the Study:
- To investigate the role of mitochondrial ferritin (MtFt) in methyl-4-phenyl-1, 2, 3, 6-tetra-pyridine (MPTP)-induced Parkinson's disease (PD).
- To determine the protective mechanisms of MtFt against MPTP-induced neurotoxicity.
Main Methods:
- MPTP was used to induce a PD model in mice.
- Mitochondrial ferritin knockout (MtFt-/-) mice and MtFt-overexpressing cells were utilized.
- Expression levels of TfR1, tyrosine hydroxylase, L-ferritin, Bcl2/Bax ratio, and ferroportin 1 were analyzed.
- Mitochondrial membrane potential, labile iron pool, reactive oxygen species, and apoptosis were assessed.
Main Results:
- MPTP upregulated MtFt expression in mouse brain regions (hippocampus, substantia nigra, striatum).
- MPTP downregulated TfR1 and tyrosine hydroxylase, while upregulating L-ferritin.
- MtFt deficiency exacerbated MPTP-induced neuronal damage, indicated by a decreased Bcl2/Bax ratio.
- MtFt overexpression protected against MPP+-induced mitochondrial damage, reduced oxidative stress, and inhibited apoptosis.
Conclusions:
- Mitochondrial ferritin plays a crucial protective role in MPTP-induced Parkinson's disease.
- MtFt mitigates neurotoxicity by inhibiting cellular iron accumulation and subsequent oxidative stress.
- These findings highlight MtFt as a potential therapeutic target for Parkinson's disease.
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