Zinc Inhibition Boosts Blood Vessel Growth in Lab-Grown Pancreatic Islets

Pancreatic islet transplantation offers a potential cure for Type 1 Diabetes, but its success is severely limited by the early death of transplanted cells due to hypoxia (lack of oxygen) before new blood vessels can form. This critical issue, known as graft ischemia, prevents the long-term survival and function of the transplanted islets. Current strategies struggle to effectively enhance early angiogenesis (new blood vessel formation) and improve islet survival. This study addresses this knowledge gap by exploring a novel pre-adaptation strategy to improve islet survival by promoting angiogenesis through zinc transportation modulation.

Pre-adaptation with ZnT-Blocker-1 significantly improved organoid survival under hypoxic conditions, demonstrating 85% viability compared to only 40% in untreated control organoids (p<0.001). This enhanced survival was strongly correlated with a 3.2-fold increase in the expression of VEGF (Vascular Endothelial Growth Factor, a crucial protein that promotes new blood vessel growth) within the pre-treated organoids. > The most impactful finding was that transplanted pre-treated organoids in diabetic mice exhibited a 2.5-fold increase in microvessel density around the graft site by day 7, leading to a remarkable 60% reduction in early graft failure compared to control transplants. Furthermore, the insulin secretion capacity of the pre-treated grafts was robustly maintained, showing 90% of their baseline function after 28 days, whereas control grafts only retained 55% of their initial function.