Proteinases in bone resorption: obvious and less obvious roles

Area of Science:

• Biochemistry
• Cell Biology
• Skeletal Biology

Background:

• Bone resorption is a vital physiological process for skeletal development and maintenance.
• Dysregulation of bone resorption is linked to various pathological conditions.
• Proteinases play a crucial role in the complex mechanisms of bone resorption.

Purpose of the Study:

• To review the multifaceted roles of proteinases in bone resorption.
• To highlight the involvement of proteinases beyond matrix solubilization.
• To discuss the potential role of proteinases in regulating the initiation and coupling of bone resorption and formation.

Main Methods:

• Literature review of scientific articles on proteinases and bone resorption.
• Analysis of identified proteinases involved in bone resorption processes.
• Discussion of recent findings on specific proteinases such as cathepsin K, MMP-9, and interstitial collagenase.

Main Results:

• Proteinases are essential for solubilizing bone matrix during resorption.
• Proteinases act as key regulators, determining the location and timing of bone resorption initiation.
• Emerging evidence suggests proteinases may influence the coupling of bone resorption with subsequent bone formation.
• Specific proteinases like cathepsin K, MMP-9, and interstitial collagenase have been identified.

Conclusions:

• Proteinases are indispensable for bone resorption, serving regulatory functions beyond matrix degradation.
• The specific proteinases critical for bone resorption may vary depending on bone type and other influencing factors.
• Further research is needed to fully elucidate the precise roles and interplay of different proteinases in skeletal homeostasis.