Abstract
Our objective was to test the hypothesis that endothelial selectins, P and E selectins, are necessary for leukocyte migration after muscle injury from unloading/reloading. Mice hindlimbs were suspended for 10 days followed by reloading periods of 6 or 24 h after which the soleus muscle was dissected. Light microscopic observations showed that macrophages, but not neutrophils, were able to invade soleus muscles in mice deficient in P/E selectins (P/E -/-) during reloading periods. The recruitment efficiency of neutrophils after 6 and 24 h of reloading was minimal in P/E-/- mice relative to unloaded animals. The recruitment of macrophages in the soleus muscle was preserved in P/E-/- mice. The concentration of macrophages increased by 8.1-fold compared with unloaded muscles in double-mutant mice after 24 h of reloading. The accumulation of macrophages in reloaded muscles did not lead to fiber necrosis. Together, these findings indicate that macrophages can invade skeletal muscle through cellular mechanisms that do not involve P/E selectins during skeletal muscle reloading.
Original language | English (US) |
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Pages (from-to) | R727-R732 |
Journal | American Journal of Physiology - Regulatory Integrative and Comparative Physiology |
Volume | 285 |
Issue number | 4 54-4 |
DOIs | |
State | Published - Oct 1 2003 |
Externally published | Yes |
Keywords
- Hindlimb suspension
- Mechanical stress
- Muscle inflammation
ASJC Scopus subject areas
- Physiology
- Physiology (medical)