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A protocol for visualizing active cathepsin K in osteoclasts with a quenched-fluorescence-activity-based probe
Aleksandra Korba1, Izabela Ciastoń2, Joanna Kozieł2
1Department of Chemical Biology and Bioimaging, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland.
STAR Protocols
|July 23, 2023
Summary
This study presents a new method to visualize active osteoclast cathepsin K (CatK) using the qTJK17 probe. This protocol allows precise localization of CatK activity within osteoclasts.
Area of Science:
- Biochemistry
- Cell Biology
- Biomedical Research
Background:
- Osteoclasts are crucial for bone remodeling.
- Active cathepsin K (CatK) plays a key role in osteoclast function.
- Visualizing active CatK is essential for understanding bone metabolism and diseases.
Purpose of the Study:
- To develop and present a protocol for visualizing active CatK in osteoclasts.
- To introduce the quenched-fluorescent-activity-based probe qTJK17 for CatK detection.
- To enable precise localization of active CatK within osteoclasts.
Main Methods:
- Isolation of peripheral blood mononuclear cells (PBMCs).
- Differentiation of PBMCs into osteoclasts.
- Staining for tartrate-resistant acid phosphatase (TRAP).
- Application of the qTJK17 probe for active CatK visualization.
Main Results:
- A detailed protocol for visualizing active CatK in osteoclasts is provided.
- The qTJK17 probe successfully binds to the active site of CatK.
- The probe's design, featuring a reactive group and fluorescence pair, enables specific detection.
- The protocol allows for the precise determination of active CatK localization within osteoclasts.
Conclusions:
- The developed protocol using qTJK17 is effective for visualizing active CatK in osteoclasts.
- This method provides a valuable tool for studying osteoclast biology and related bone diseases.
- Accurate localization of active CatK can advance research in bone metabolism and pathology.
