PMID: 8604016Mar 1, 1996Paper

Apoptosis of macrophages during the resulution of muscle inflammation

Journal of Leukocyte Biology
James G Tidball, B A St Pierre

Abstract

We tested the hypothesis that apoptosis contributes to the depletion of macrophages expressing the ED1 or ED2 antigen during the resolution of rat muscle inflammation. Muscle inflammation was induced by subjecting rat soleus muscle to 10 days of unloading followed by periods of muscle reloading. Terminal deoxynucleotidyl transferase- mediated deoxyuridine triphosphate (dUTP) labeling of apoptotic nuclei showed that apoptotic inflammatory cells increase in concentration within necrotic fibers and in the connective tissue at 2 days following muscle injury caused by increased loading. Four days following injury, the apoptotic cells within damaged fibers returned to control levels, and at 7 days following injury apoptotic cells in the connective tissue returned to control concentrations. No preferential, internucleosomal cleavage of DNA from inflamed muscle was observed, although there was greater fragmentation of DNA in inflamed muscle than in controls. Double labeling studies show that cells expressing either ED1 or ED2 antigen can undergo apoptosis in vivo. The time course of apoptosis and concentration of apoptotic cells within damaged muscle fibers indicates that apoptosis contributes to returning ED1+ cells to control concent...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis