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Regulating Enzyme Activity via Microaggregates Mediated by Phase Separation.

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Summary
This summary is machine-generated.

Researchers developed D-Peptide mediated Microaggregate Degradation (DPMD) to treat postoperative pancreatic fistula (POPF) by inducing liquid-solid phase separation (LSPS) of enzymes. This novel approach effectively sequesters pathogenic enzymes, reducing inflammation and improving survival in preclinical models.

Keywords:
chiral peptideenzyme sequestrationmicroaggregatesphase separationpostoperative pancreatic fistula

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Area of Science:

  • Biochemistry and Molecular Biology
  • Biomaterials Science
  • Translational Medicine

Background:

  • Liquid-solid phase separation (LSPS) is a key biomolecular process for forming aggregates that influence biochemical reactions.
  • Postoperative pancreatic fistula (POPF) is a severe complication characterized by pathogenic enzyme activity in the seroperitoneum.
  • Current treatments for POPF lack targeted enzyme sequestration strategies.

Purpose of the Study:

  • To develop a novel enzyme-regulation strategy using LSPS for treating POPF.
  • To create a D-Peptide mediated Microaggregate Degradation (DPMD) system for capturing trypsin and chymotrypsin.
  • To evaluate the efficacy and safety of DPMD in preclinical POPF models.

Main Methods:

  • Designed DPMD with specific peptide motifs for binding cationic and hydrophobic residues, promoting β-sheet formation and self-assembly.
  • Induced LSPS to form peptide-enzyme microaggregates, sequestering target proteases from the extracellular environment.
  • Assessed DPMD's efficacy in rat POPF models, measuring pancreatic fluid leakage, inflammatory markers, survival rates, and performing toxicity evaluations.

Main Results:

  • DPMD successfully induced LSPS, forming microaggregates that captured target enzymes (trypsin and chymotrypsin).
  • In rat POPF models, DPMD significantly reduced pancreatic fluid leakage and inflammatory markers, leading to improved survival.
  • Toxicity studies indicated DPMD was well-tolerated at supra-therapeutic doses, demonstrating a favorable safety profile.

Conclusions:

  • DPMD represents a significant translational advance in POPF treatment by utilizing LSPS for pathogenic enzyme sequestration.
  • The DPMD system effectively isolates and clears harmful enzymes, offering a promising therapeutic strategy.
  • This approach broadens the potential application of LSPS in treating various enzyme-mediated diseases.