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Surface Engineering of Pancreatic Islets with a Heparinized StarPEG Nanocoating
Published on: June 23, 2018
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Surface Engineering of Pancreatic Islets with a Heparinized StarPEG Nanocoating
Jingyi Yang1, Shaofeng Lou1, Deling Kong1
1Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Science & Peking Union Medical College.
Journal of Visualized Experiments : Jove
|July 10, 2018
Summary
This study presents a novel method for engineering pancreatic islet surfaces using a heparin-incorporated starPEG nanocoating. This technique protects transplanted cells and enhances graft survival by minimizing immune attack and inflammation.
Area of Science:
- Biomaterials Science
- Cell Biology
- Immunology
Background:
- Cell surface engineering is crucial for protecting transplanted cells from immune rejection and improving graft outcomes.
- Pancreatic islet transplantation faces challenges due to immune responses and inflammatory reactions.
- Developing mild and effective surface modification techniques is essential for successful cell-based therapies.
Purpose of the Study:
- To develop and optimize an ultrathin heparin-incorporated starPEG (Hep-PEG) nanocoating for pancreatic islet surface engineering.
- To evaluate the efficacy of Hep-PEG nanocoating in protecting islets from immune attack and improving graft survival.
- To establish a versatile platform for further functionalization of cell surfaces for enhanced therapeutic applications.
Main Methods:
- Synthesis of heparin succinimidyl succinate (Heparin-NHS) using EDC and NHS.
- Crosslinking of amino end-functionalized eight-armed starPEG (starPEG-(NH2)8) with Heparin-NHS to form the Hep-PEG nanocoating.
- Isolation and purification of mouse islets using collagenase digestion and Histopaque gradient.
- Surface coating of isolated islets with Hep-PEG solution for covalent binding.
Main Results:
- The Hep-PEG nanocoating was successfully applied to pancreatic islets with minimal alteration to islet size and volume.
- Heparinization of islets with Hep-PEG demonstrated potential to reduce instant blood-mediated inflammatory reactions.
- The nanocoating process was mild, preserving cell viability and demonstrating suitability for surface engineering of living cells.
- The Hep-PEG nanocoating provides a platform for incorporating biological mediators, enabling multi-layered cell surface bioengineering.
Conclusions:
- Hep-PEG nanocoating offers a promising strategy for immune protection and enhanced survival of transplanted pancreatic islets.
- This "easy-to-adopt" protocol is effective for surface engineering of living cells without compromising viability.
- The developed nanocoating platform facilitates the incorporation of functional biomolecules, paving the way for advanced cell-based therapies.
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