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The authors investigated changes in the location and number of osteoclasts and their precursors during the development of articular lesions in type II collagen-induced arthritis in mice using tartrate-resistant acid phosphatase (TRAP) staining. The limb joints were examined at 6 to 15 weeks after the second immunization. The number of TRAP-positive cells increased as the articular lesions progressed. TRAP-positive macrophage-like cells were found in the hyperplastic synovial tissue and bone marrow stroma in the early stage. In the advanced stage, in addition to many TRAP-positive osteoclasts on the bone surface, TRAP-positive macrophage-like cells were observed in the pannus apart from the bone surface in the pannus-joint junctions. The above mentioned TRAP-positive macrophage-like cells are considered to be osteoclast precursors.

jikken doubutsu ihou/jikken doubutsu/experimental animals/jikken dobutsu

Changes in Location and Number of Tartrate-Resistant Acid Phosphatase(TRAP)-Positive Cells During the Development of Type II Collagen-Induced Arthritis in DBA/1J Mice.