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Polymer nanocarriers protecting active enzyme cargo against proteolysis
Thomas D Dziubla1, Adnan Karim, Vladimir R Muzykantov
1Institute for Environmental Medicine, University of Pennsylvania School of Medicine, 1 John Morgan/6068, 3620 Hamilton Walk, Philadelphia, PA 19104, USA. dziubla@mail.med.upenn.edu
Summary
Novel polymeric nanocarriers (PNCs) effectively load and stabilize the antioxidant enzyme catalase. This advance offers a promising strategy for treating diseases linked to vascular oxidative stress.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Enzyme Engineering
Background:
- Polymeric nanocarriers (PNCs) show potential for vascular drug delivery but struggle with enzyme loading and stability.
- Enzyme therapies are limited by poor cargo loading and rapid inactivation, especially for large enzymes like catalase.
Purpose of the Study:
- To develop an efficient method for loading active catalase into PNCs for vascular drug delivery.
- To investigate the stability and protective capacity of PNC-encapsulated catalase in a proteolytic environment.
- To address vascular oxidative stress using enzyme-loaded nanocarriers.
Main Methods:
- A novel freeze-thaw encapsulation strategy was employed to load catalase into biodegradable poly(ethylene glycol)-b-poly(lactic-glycolic acid) PNCs (200-300 nm).
- The loading efficiency and retention of catalase activity in PNCs were quantified.
- The stability of encapsulated catalase was assessed in a proteolytic environment compared to free catalase.
Main Results:
- The freeze-thaw method achieved approximately 20% loading efficiency for active catalase into PNCs.
- PNC-encapsulated catalase retained 25-30% of its H(2)O(2)-degrading activity for at least 18 hours in a proteolytic environment.
- Free catalase lost its activity within 1 hour under the same conditions.
Conclusions:
- The developed freeze-thaw encapsulation strategy successfully loads and stabilizes active catalase within PNCs.
- PNCs provide significant protection to catalase from proteolytic degradation, enhancing its therapeutic duration.
- This PNC-based enzyme delivery system holds promise for treating vascular oxidative stress-related diseases.