Silk fibroin preserves beta cell function under inflammatory stress while stimulating islet cell surface GLUT2...

Area of Science:

• Biomaterials science
• Transplantation immunology
• Endocrinology

Background:

• Silk fibroin is a novel biomaterial with potential applications in regenerative medicine.
• Transplantation of pancreatic islets is a promising therapy for type 1 diabetes, but graft survival and function remain challenges.
• Inflammatory stress during transplantation can impair islet cell function and survival.

Purpose of the Study:

• To investigate the potential of silk fibroin to improve pancreatic islet function and survival under inflammatory conditions.
• To determine if silk fibroin preconditioning enhances glucose-stimulated insulin secretion and GLUT2 transporter expression in islets challenged with inflammatory cytokines.

Main Methods:

• Murine islets were cultured in vitro with either silk fibroin or alginate.
• Islets were challenged with inflammatory cytokines to mimic transplantation stress.
• Glucose-stimulated insulin secretion (GSIS) was measured.
• GLUT2 transporter expression on islet cell surfaces was assessed using flow cytometry.

Main Results:

• While inflammatory cytokines reduced GSIS in all groups, islets preconditioned with silk fibroin showed better preservation of function compared to alginate or medium alone.
• Silk fibroin preconditioning significantly increased GLUT2 transporter expression on islet cell surfaces.
• This increased GLUT2 expression persisted even under inflammatory cytokine stress.

Conclusions:

• Silk fibroin preconditioning enhances islet cell surface GLUT2 expression.
• This effect may contribute to improved islet engraftment and function following transplantation, particularly under inflammatory stress.
• Silk fibroin represents a promising biomaterial for improving islet transplantation outcomes.