Persistent penetration of MPTP through the nasal route induces Parkinson's disease in mice
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Updated: Jul 19, 2026
Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
Published on: January 7, 2014
Ana I Rojo1, Celia Montero, María Salazar
1Instituto de Investigaciones Biomédicas and Departamento de Bioquímica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029 Madrid, Spain.
Abstract:
The aetiology of idiopathic Parkinson's disease (PD) is poorly defined but environmental aggression may be relevant. Here, we report a new model of PD in mice, based on chronic inoculation with neurotoxins in the nasal cavity, which is a natural route of contact with the environment. C57BL/6 mice, submitted to daily intranasal inoculation with MPTP for 30 days, developed motor deficits that correlated with a progressive and severe depletion of striatal dopamine levels, and loss of tyrosine hydroxylase and dopamine transporter staining in substantia nigra and striatum. Moreover, mice intranasally inoculated with MPTP developed strong astrogliosis and microgliosis in substantia nigra and striatum. Consistent with these observations, a role for oxidant aggression was demonstrated by increased levels of Mn-superoxide dismutase. However, alpha-synuclein aggregation was not observed. This new animal model provides a new tool for studying PD symptoms that develop slowly over time, and it may be used to asses risk from environmental neurotoxins.
Insights
Researchers developed a new Parkinson's disease (PD) mouse model using intranasal neurotoxin exposure. This model mimics slow-onset PD symptoms and aids in studying environmental risk factors for Parkinson's disease.
Area of Science:
- Neuroscience
- Toxicology
- Pathology
Background:
- The causes of idiopathic Parkinson's disease (PD) are not fully understood, but environmental factors may play a role.
- The nasal cavity offers a direct route for environmental neurotoxins to reach the brain.
Purpose of the Study:
- To develop a novel mouse model of Parkinson's disease (PD) using chronic intranasal neurotoxin administration.
- To investigate the pathological changes and motor deficits associated with this new PD model.
Main Methods:
- C57BL/6 mice received daily intranasal inoculation with MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) for 30 days.
- Assessed motor function, striatal dopamine levels, tyrosine hydroxylase (TH) and dopamine transporter (DAT) staining.
- Examined glial activation (astrogliosis and microgliosis) and oxidative stress markers (Mn-superoxide dismutase).
Main Results:
- Mice exhibited motor deficits and progressive depletion of striatal dopamine.
- Significant loss of TH and DAT staining was observed in the substantia nigra and striatum.
- Intranasal MPTP induced astrogliosis and microgliosis, with increased Mn-superoxide dismutase, indicating oxidative stress.
- Alpha-synuclein aggregation was not detected in this model.
Conclusions:
- Chronic intranasal MPTP administration creates a valid mouse model for studying slowly developing Parkinson's disease (PD) symptoms.
- This model is valuable for investigating the role of environmental neurotoxins in PD pathogenesis.
- The model can be used to assess the risk associated with environmental neurotoxins and test potential interventions.
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