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Changes in and effective factors of microtubule-associated protein 2 in traumatic neurons
1Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
Objective:
To investigate alterations in the microtubule-associated protein 2 (MAP-2) of neurons in Wistar rats and the effect of nimodipine (Nim), D-2-amino-5-phosphonovaleric acid (D-AP-5) and mild hypothermia on neuronal MAP-2 following fluid percussion injury (FPI).
Methods:
Alterations of MAP-2 in Wistar rat neurons following FPI were measured by a confocal laser-scanning microscope using MAP-2 immunofluorescence staining as a MAP-2 indicator.
Results:
MAP-2 immunofluorescence staining was limited to the cell bodies and dendritic compartments of neurons and more intense in dendrites than in cell bodies. The loss of MAP-2 was marked at 3 h post-trauma (P < 0.01), and reached a maximum at 48 h post-trauma. Afterwards, fluorescence recovered partly at 72 h post-trauma. The application of Nim markedly reduced the loss of MAP-2 immunoreactivity within 1 h post-trauma (P < 0.01), and the application of D-AP-5 markedly reduced the loss of MAP-2 immunoreactivity within 10 h post-injury (P < 0.01). The application of mild hypothermia decreased the loss of MAP-2 immunoreactivity within 1 h post-injury (P < 0.05).
Conclusions:
The partial recovery of fluorescence at 72 h post-trauma indicate that the partial structure of the neuronal microtubules can be repaired by itself. Nim, D-AP-5 and mild hypothermia reduce the degradation of MAP-2 by different mechanisms. The treatment of neuronal cytoskeleton degradation following FPI must employ multiple therapeutic approaches.
Insights
Fluid percussion injury (FPI) causes significant loss of microtubule-associated protein 2 (MAP-2) in neurons. Nimodipine, D-AP-5, and mild hypothermia treatments mitigate this neuronal damage.
Area of Science:
- Neuroscience
- Cell Biology
- Trauma Research
Background:
- Microtubule-associated protein 2 (MAP-2) is crucial for neuronal structure and function.
- Fluid percussion injury (FPI) is a common model for traumatic brain injury (TBI).
- Neuronal cytoskeleton integrity is compromised following TBI.
Purpose of the Study:
- To investigate changes in neuronal MAP-2 after FPI in Wistar rats.
- To evaluate the neuroprotective effects of nimodipine (Nim), D-2-amino-5-phosphonovaleric acid (D-AP-5), and mild hypothermia on MAP-2 following FPI.
Main Methods:
- Wistar rats were subjected to FPI.
- MAP-2 alterations were assessed using confocal laser-scanning microscopy and MAP-2 immunofluorescence staining.
- The effects of Nim, D-AP-5, and mild hypothermia were evaluated post-injury.
Main Results:
- MAP-2 immunofluorescence was observed in neuronal cell bodies and dendrites, with higher intensity in dendrites.
- Significant MAP-2 loss occurred by 3 hours post-FPI, peaking at 48 hours, with partial recovery by 72 hours.
- Nim, D-AP-5, and mild hypothermia significantly reduced MAP-2 loss post-injury.
Conclusions:
- Neuronal microtubules show partial self-repair capacity following FPI.
- Nim, D-AP-5, and mild hypothermia protect against MAP-2 degradation through distinct mechanisms.
- Combined therapeutic strategies are necessary to address neuronal cytoskeleton degradation after FPI.