Perlecan: An Islet Basement Membrane Protein with Protective Anti-Inflammatory Characteristics.

Area of Science:

• Biomaterials Science
• Transplantation Immunology
• Cell Biology

Background:

• Human islet isolation for transplantation often damages the islet basement membrane (BM) and reduces oxygen supply.
• Reconstructing the BM is a potential strategy to enhance islet function and survival, especially in encapsulation devices and scaffolds.

Purpose of the Study:

• To evaluate the protective effects of Perlecan, alone or with Collagen-IV and Laminin-521, against hypoxia-induced damage in isolated human islets.
• To assess the impact of these basement membrane proteins (BMPs) on islet survival, function, and inflammatory markers.

Main Methods:

• Human islets from seven organ donors were cultured for 4-5 days under low oxygen conditions (2%).
• Islets were treated with Perlecan, Collagen-IV, Laminin-521, or combinations thereof, compared to sham-treated controls.
• Post-culture, islet survival, in vitro function, and production of chemokines and reactive oxygen species (ROS) were analyzed.

Main Results:

• Individual BMPs significantly increased islet survival and in vitro function by approximately twofold.
• Combined BMPs did not demonstrate a synergistic protective effect.
• Perlecan exhibited the most potent inhibition of chemokine and ROS production compared to controls (p < 0.001).

Conclusions:

• Perlecan shows significant promise for improving human islet survival and function, both pre- and post-transplantation.
• The anti-inflammatory properties of Perlecan are crucial for optimizing encapsulation and scaffold designs to protect islets.