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Inguinal Subcutaneous White Adipose Tissue ISWAT Transplantation Model of Murine Islets
Published on: February 16, 2020
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Molecular Retention Limitations for Prevascularized Subcutaneous Sites for Islet Transplantation
Kosala D Waduthanthri1, Purushothaman Kuppan2,3, Gregory S Korbutt2,3
1Department of Chemical and Materials Engineering, Donadeo Innovation Centre for Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB T6G 1H9, Canada.
Biomacromolecules
|February 13, 2024
Summary
Prevascularization of subcutaneous sites enhances beta cell therapy by creating a barrier that controls molecule movement. This barrier
Area of Science:
- Biomaterials Science
- Transplantation Immunology
- Endocrinology
Background:
- Subcutaneous implantation offers advantages for beta cell replacement therapy, including accessibility and noninvasive monitoring.
- Prevascularization of implant sites aims to improve islet survival and reduce immune responses.
- Understanding molecular exchange between host and implant is crucial for optimizing subcutaneous transplantation.
Purpose of the Study:
- To investigate the impact of prevascularization on molecular transport within the subcutaneous space.
- To determine how molecular size influences clearance from prevascularized sites.
- To inform the design of optimal subcutaneous transplantation sites for enhanced beta cell graft survival.
Main Methods:
- Injection of poly(ethylene oxide)s (PEOs) with varying molecular weights into prevascularized and unmodified subcutaneous sites in mice.
- Characterization of molecule clearance rates and organ biodistribution.
- Determination of the molecular weight cutoff for vascular entry and clearance.
Main Results:
- Prevascularization established a barrier, restricting molecule diffusion compared to unmodified sites.
- Molecular clearance from prevascularized sites was inversely correlated with molecular weight.
- The maximum molecular weight for clearance via vasculature was identified as 35 kDa.
Conclusions:
- Vascularization significantly influences molecular retention and transport at subcutaneous implant sites.
- Molecular size is a critical factor in the mobility of hydrophilic molecules from prevascularized sites.
- These findings are essential for optimizing subcutaneous environments to improve beta cell graft survival.
