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Published on: November 6, 2014
Cysteine-proteinase localization in osteoclasts: an immunocytochemical study
1Second Department of Oral Anatomy, School of Dentistry, Showa University, Tokyo, Japan.
Cell and Tissue Research
|January 1, 1993
Summary
Cysteine-proteinases, cathepsin B and G, are found in rat osteoclasts, suggesting their role in breaking down bone matrix proteins extracellularly. These enzymes are located in specific cellular compartments and the bone resorption area.
Area of Science:
- Biochemistry
- Cell Biology
- Histology
Background:
- Osteoclasts are crucial for bone resorption.
- Cysteine-proteinases are implicated in matrix degradation.
- Localization of these enzymes within osteoclasts is not fully understood.
Purpose of the Study:
- To localize cathepsin B and G within rat osteoclasts.
- To investigate the potential role of these enzymes in bone matrix degradation.
Main Methods:
- Indirect protein A-immunogold labeling technique.
- Analysis of post-embedded ultrathin sections of rat osteoclasts.
Main Results:
- Specific immunogold labeling for cathepsin B and G was observed in Golgi vesicles, lysosomes, pale vacuoles, and extracellular canals of ruffled borders.
- No immunoreactivity was detected in the cytoplasmic matrix, mitochondria, rough endoplasmic reticulum, or nuclei.
- Labeling was present in both osteoclasts and the subosteoclastic compartment.
Conclusions:
- Cathepsin B and G are present in specific intracellular compartments of osteoclasts.
- These enzymes are likely involved in the extracellular degradation of collagen and other bone matrix proteins.
