Injury and repair of the soleus muscle after electrical stimulation of the sciatic nerve in the rat
Use this link to cite this item : https://ir.lib.hiroshima-u.ac.jp/00020793
ID | 20793 |
file | |
creator |
Matsuura, Natsue
Ozawa, Junya
Kai, Satoru
Sakakima, Harutoshi
Abiko, Sachiko
|
NDC |
Medical sciences
|
abstract | To study injury and subsequent changes in skeletal muscles, the rat sciatic nerve was electrically stimulated at 50 Hz and muscle contraction was induced for 30 min. Muscle damage was classified into five types (hypercontraction, hyperstretching, Z band disorders, misalignment of myofilament and regions of scarce myofilaments) by electron microscopy and quantified by ultrastructural assessment. After electrical nerve stimulation, the percentages of the injured areas of the soleus muscle were 18.8 ± 15.8% (mean ± SD) at O h, 9.7 ± 1.0 0x1.3f1c4p-890t 6 h, 22.0 ± 23.6 0x0p+0t 12 h, 13.1 ± 3.2 0x0p+0t 24 h, 4.9 ± 6.0 0x0p+0t 3 days and 0.5 ± 0.4 0x0p+0t 7 days. At 0 h, the vast majority of ultrastructural alterations were sarcomere hypercontraction. At 6 h, hypercontraction was not recognizable and sarcomere hyperstretching and Z band disarrangement constituted the major findings. At 12 h, when the injury reaehed its maximum, myofilament disorganization and hyperstretching were predominant. At 24 h or afterwards, the injury began to decrease and recovered to almost normal conditions by 7 days. There were very few necrotic muscle fibers in all specimens. It is considered that the muscle lesions in the present study were reversible, and recovered through changes in various types of sarcomere alterations. Z band streaming and free ribosomes were frequently found at 12 and 24 h, which may indicate repair processes rather than newly formed lesions.
|
journal title |
Archives of Histology and Cytology
|
volume | Volume 64
|
issue | Issue 4
|
start page | 393
|
end page | 400
|
date of issued | 2001
|
publisher | International Society of Histology and Cytology
|
issn | 0914-9465
|
ncid | |
publisher doi | |
pubmed id | |
language |
eng
|
nii type |
Journal Article
|
HU type |
Journal Articles
|
DCMI type | text
|
format | application/pdf
|
text version | publisher
|
relation url | |
department |
Graduate School of Health Science
|