Abstract：
:We examined the possibility that chondrocytes in Meckel's cartilage might secrete matrix metalloproteinase-1 (MMP-1) during degradation of the extracellular matrix. Evidence for the secretion of MMP-1 was obtained by immunohistochemical staining and immunoelectron microscopy, in addition to general histochemical staining for proteoglycans. Not only staining with toluidine blue and alcian blue but also immunostaining for chondroitin sulfate proteoglycan (CSPG) revealed that levels of glycoproteins are rapidly reduced at the late stage of degradation. MMP-1 was detected continuously in cells from chondrocytes at the early stage to hypertrophic chondrocytes at the late stage. Immunoelectron microscopy revealed that the deposition of colloidal golds shifted from an intracellular localization in chondrocytes at the early stage to pericellular spaces at the late stage. The localization of tissue inhibitor of the metalloproteinase-1 (TIMP-1) at the early stage was similar to that of MMP-1, but the level of TIMP-1 decreased significantly in hypertrophic cartilage. These findings suggest that MMP-1 is present continuously in Meckel's chondrocytes but that the active form, which degrades the extracellular matrix, is the MMP-1 that accumulates in the pericellular spaces around hypertrophic chondrocytes.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Ishizeki K,Nawa Tdoi
10.1054/tice.2000.0106subject
Has Abstractpub_date
2000-06-01 00:00:00pages
207-15issue
3eissn
0040-8166issn
1532-3072pii
S0040-8166(00)90106-Xjournal_volume
32pub_type
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