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Improved Cathepsin Probes for Sensitive Molecular Imaging.

Yonit Yitzhak1, Hanmant Gaikwad1, Tommy Weiss-Sadan1

  • 1The Institute for Drug Research, The School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.

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This summary is machine-generated.

Researchers developed improved fluorescent probes to detect cysteine cathepsin protease activity within cells. These next-generation probes offer enhanced sensitivity and detection capabilities for cellular cathepsin activity.

Keywords:
activity-based probescathepsincell permeability

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Cysteine cathepsin proteases are vital lysosomal enzymes involved in cellular processes.
  • Dysregulated cathepsin activity is linked to diseases like cancer and cardiovascular conditions.
  • Existing fluorescent probes have suboptimal binding potency and cell permeability.

Purpose of the Study:

  • To develop improved fluorescent activity-based probes (ABPs) for monitoring intracellular cathepsin activity.
  • To enhance probe potency and cell permeability for better detection.

Main Methods:

  • Designed a novel cathepsin ABP with a P1 positive charge by modifying tag linkage.
  • Optimized probe structure by trimming and altering fluorophore attachment for improved cell permeability.
  • Evaluated probe performance against recombinant cathepsins and in intact cells.

Main Results:

  • The modified probe demonstrated enhanced binding potency towards recombinant cathepsins.
  • Initial modifications reduced cell permeability, which was overcome by subsequent structural optimization.
  • The final probe design exhibited excellent cell permeability and superb detection of cathepsin activity in intact cells.

Conclusions:

  • Introduced a prototype for next-generation, highly sensitive cathepsin activity-based probes.
  • The optimized probe design facilitates superior detection of intracellular cathepsin activity.
  • This advancement aids in understanding cathepsin roles in health and disease.