Rat peritoneal macrophages stimulated in vivo by group A streptococcal peptidoglycan-polysaccharide (PG-APS) resorb bone as measured by solubilization of45Ca from radiolabeled, devitalized bone chips. Activity was strain-dependent and correlated with the susceptibility of rat strains to PG-APS-induced arthritis. PG-APS-stimulated macrophages from the resistant Buf rat strain were not induced to resorb bone, but ingested equivalent concentrations of PG-APS compared to bone-resorbing macrophages from the arthritis-susceptible Lew strain. Resorptive activity peaked at three to five days and decreased to background levels by 10 days after injection. PG-APS-stimulated macrophages from congenitally athymic Lew rats were as effective as macrophages from heterozygous littermates at resorbing bone. Lew macrophages were also responsive to small, nonarthropathic PG-APS polymers generated by mutanolysin digestion. Resident peritoneal macrophages did not respond to stimulation by PG-APS in vitro. Indomethacin at a concentration of 10 μg/ml was an effective blockade against PG-APS-induced macrophage bone resorption in vitro, but catalase was ineffective. These results indicate that expression of rat macrophage bone-resorbing activity reflects genetic regulation of the response to PG-APS rather than a defect in ingestion of these polymers and imply that PG-APS-stimulated, bone-resorbing macrophages may contribute to early, initial bone destruction that occurs in inflammatory arthritis.
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Bristol-Rothstein, L.A., Schwab, J.H. Bone-resorbing activity is expressed by rat macrophages in response to arthropathic streptococcal cell wall polymers. Inflammation 16, 485–496 (1992). https://doi.org/10.1007/BF00918974
- Peritoneal Macrophage
- Inflammatory Arthritis
- Bone Destruction