Small-molecule Cathepsin K inhibitors: a medicinal chemistry perspective

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Xuan Guan1,2, Shu Cheng1, Yifei Yin1

  • 1State Key Laboratory of Oral Diseases, West China School of Stomatology, National Clinical Research Center for Oral Diseases, Sichuan University, Chengdu, China.

Future Medicinal Chemistry
|August 5, 2025
PubMed

Insights

Cathepsin K (Cat K) is a key enzyme in bone resorption and protein breakdown. Inhibitors targeting Cat K offer promising therapeutic strategies for various human diseases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Cathepsin K (Cat K) is a cysteine protease predominantly expressed in osteoclasts.
  • It plays a crucial role in extracellular matrix degradation, particularly collagen.
  • Dysregulation of Cat K is implicated in bone diseases and other pathologies.

Purpose of the Study:

  • To review the structure and biological functions of Cathepsin K.
  • To explore the therapeutic potential of Cat K inhibitors for human diseases.

Main Methods:

  • Literature review of Cat K structure and function.
  • Analysis of existing research on Cat K inhibitors.
  • Evaluation of therapeutic applications.

Main Results:

  • Cat K possesses potent collagenolytic activity, essential for osteoclast function.
  • Its specific structure allows for targeted inhibition.
  • Various Cat K inhibitors are under investigation for diseases like osteoporosis and arthritis.

Conclusions:

  • Cathepsin K is a significant therapeutic target.
  • Development of specific Cat K inhibitors holds promise for treating bone-related disorders and other diseases.
  • Further research is needed to optimize inhibitor efficacy and safety.
Keywords:
Cathepsin Kdrug designmolecular binding modessmall molecule inhibitorsstructure-activity relationships (SAR)

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