Slow progression of sciatic nerve degeneration and regeneration after loose ligation through microglial activation and decreased KCC2 levels in the mouse spinal cord ventral horn
| Autor: | Koyata Matsuda, Daichi Kinjo, Chitoshi Takayama, Shiori Kobayashi, Yoshinori Kosaka, Jeongtae Kim, Tsukasa Yafuso, Nobuhiko Okura, Akihito Okabe, Chigusa Shimizu-Okabe |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Glycine Choline O-Acetyltransferase Mice Peripheral Nerve Injuries Internal medicine medicine Animals Galanin gamma-Aminobutyric Acid Motor Neurons Symporters Chemistry General Neuroscience Regeneration (biology) Spinal Cord Ventral Horn General Medicine Motor neuron Spinal cord Choline acetyltransferase Sciatic Nerve Nerve Regeneration Endocrinology medicine.anatomical_structure nervous system Spinal Cord Peripheral nerve injury Nerve Degeneration Sciatic nerve Microglia Acetylcholine medicine.drug |
| Zdroj: | Neuroscience research. 177 |
| ISSN: | 1872-8111 |
| Popis: | Peripheral nerve injury affects motor functions. To reveal the mechanisms underlying motor dysfunction and recovery after nerve compression, which have not been precisely examined, we investigated the temporal relationship among changes in motor function, nerve histopathology, and marker molecule expression in the spinal cord after loose ligation of the mouse sciatic nerve. After ligation, sciatic motor function suddenly declined, and axons gradually degenerated. During degeneration, galanin was localized in motor neuron cell bodies. Then, in the ventral horn, microglia were activated, and expression of choline acetyltransferase (ChAT), a synthetic enzyme of acetylcholine, and potassium chloride co-transporter 2 (KCC2), which shifts the action of γ-amino butyric acid (GABA) and glycine to inhibitory, decreased. Motor function recovery was insufficient although axonal regeneration was complete. ChAT levels gradually recovered during axonal regeneration. When regeneration was nearly complete, microglial activation declined, and KCC2 expression started to increase. The KCC2 level sufficiently recovered when axonal regeneration was complete, suggesting that the excitatory action of GABA/glycine may participate in axonal regeneration. Furthermore, these changes proceeded slower than those after severance, suggesting that loose ligation, compression, may mediate slower progression of degeneration and regeneration than severance, and these changes may cause the motor dysfunction and its recovery. |
| Databáze: | OpenAIRE |
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