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Ventricular injection of nerve growth factor increases dopamine content in the striata of MPTP-treated mice
1Laboratory of Neuroimmunology, National Institute of Neurology and Neurosurgery, Mexico.
Abstract:
Experimental depletion of dopaminergic striatal neurons was induced in mice with the neurotoxin MPTP. To investigate a possible effect of nerve growth factor on the damaged neurons, we injected 4 micrograms into the right cerebral ventricle of mice three days after the last administration of MPTP. We found a significant increase of dopamine and homovanillic acid in the striatum of MPTP treated mice after NGF administration when compared with dopamine and HVA levels in MPTP-treated control mice (p less than 0.001). The increase of dopamine and homovanillic acid seems to be related to a partial restorative effect of NGF on the damaged dopaminergic cells, since ventricular administration of NGF to normal mice did not increase dopamine or homovanillic acid contents above the levels measured in untreated controls. It appears that administration of nerve growth factor produces a beneficial effect on damaged dopaminergic neurons; this effect could be due to stimulation of neuron sprouting from neurons that survived the toxic effect of MPTP. The increase of dopamine levels was seen 8 days after injection of nerve growth factor and was maintained at least until day 25, showing a lasting persistence of the restorative effect.
Insights
Nerve growth factor (NGF) partially restored dopamine and homovanillic acid levels in mice with damaged dopaminergic neurons. This suggests NGF may promote neuron sprouting and offers a potential therapeutic avenue for neurodegenerative conditions.
Area of Science:
- Neuroscience
- Neurobiology
- Pharmacology
Background:
- Dopaminergic striatal neurons are crucial for motor control.
- Neurotoxin MPTP induces experimental Parkinsonism by damaging these neurons.
- Investigating neurotrophic factors like NGF is vital for understanding neuroprotection.
Purpose of the Study:
- To determine the effect of nerve growth factor (NGF) on MPTP-induced dopaminergic neurodegeneration.
- To assess NGF's potential to restore dopamine and homovanillic acid levels in damaged striatal neurons.
Main Methods:
- Mice were treated with the neurotoxin MPTP to induce experimental Parkinsonism.
- Nerve growth factor (NGF) was administered intracerebroventricularly three days after MPTP exposure.
- Dopamine and homovanillic acid levels in the striatum were measured and compared between groups.
Main Results:
- NGF administration significantly increased dopamine and homovanillic acid levels in MPTP-treated mice compared to controls (p < 0.001).
- NGF did not elevate these levels in normal, untreated mice, indicating a restorative effect on damaged neurons.
- The observed increase in dopamine levels persisted for at least 25 days post-NGF injection.
Conclusions:
- Nerve growth factor (NGF) demonstrates a beneficial, restorative effect on damaged dopaminergic neurons.
- NGF may promote neuron sprouting from surviving dopaminergic cells, contributing to functional recovery.
- These findings suggest NGF as a potential therapeutic agent for conditions involving dopaminergic neurodegeneration.