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Retrograde changes in transglutaminase activity after peripheral nerve injuries
W Tetzlaff1, V H Gilad, C Leonard
1Department of Medical Physiology, University of Calgary, Alta., Canada.
Brain Research
|March 29, 1988
Summary
Transglutaminase activity increases in peripheral nerves and ganglia after injury, indicating a role in nerve repair. These changes occur in specific nerve segments and neuronal systems, offering insights into neural injury responses.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Transglutaminase activity is known to increase in the superior cervical ganglion after nerve injury.
- The response of other peripheral neuronal systems to nerve injury is less understood.
Purpose of the Study:
- To investigate transglutaminase activity changes in other peripheral neuronal systems following nerve injury.
- To determine the location (axons vs. non-neuronal cells) and distribution of injury-induced transglutaminase activity along the nerve.
Main Methods:
- Nerve crush injury was performed on the vagus nerve, sciatic nerve, and facial nerve in rats.
- Transglutaminase activity was measured in ganglia and nerve segments at various time points post-injury.
Main Results:
- Vagus nerve crush led to increased transglutaminase activity in the nodose ganglion and proximal vagus nerve stump.
- Facial nerve crush caused a transient increase in facial nucleus transglutaminase activity, with a rebound effect after a second lesion.
- No significant changes were observed in dorsal root ganglia up to 24 hours after sciatic nerve crush.
Conclusions:
- Transglutaminase activity changes in response to nerve injury are not uniform across all peripheral neuronal systems.
- The observed increases in transglutaminase activity suggest its involvement in the neuronal response to peripheral nerve injury.
- Injury-induced transglutaminase activity is localized to specific nerve segments and neuronal cell types.