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Sustained beta-cell dysfunction but normalized islet mass in aged thrombospondin-1 deficient mice
Carl Johan Drott1, Johan Olerud, Hanna Emanuelsson
1Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden.
Plos One
|October 25, 2012
Summary
Thrombospondin-1 (TSP-1) deficiency in pancreatic islets leads to chronic beta-cell dysfunction that is irreversible if not treated early in life. Long-term TSP-1 absence causes lasting changes in islet vascular and endocrine morphology.
Area of Science:
- Endocrinology
- Vascular Biology
- Cell Biology
Background:
- Pancreatic islet endothelial cells support beta-cell function.
- Thrombospondin-1 (TSP-1) is an islet endothelial-specific glycoprotein crucial for islet angiogenesis and beta-cell function in young mice.
Purpose of the Study:
- To investigate the long-term effects of TSP-1 deficiency on islet morphology and beta-cell function.
- To determine if TSP-1 deficiency-induced beta-cell dysfunction is reversible in adult mice.
Main Methods:
- Assessed islet and beta-cell mass, islet vascularity, and glucose tolerance in TSP-1 deficient mice at various ages.
- Evaluated in vivo insulin secretion capacity using a transplantation model.
- Reconstituted TSP-1 in adult TSP-deficient islets.
Main Results:
- Islet and beta-cell mass initially increased but normalized in young TSP-1 deficient mice.
- Islet vascularity was normal in young but hypervascular in aged TSP-1 deficient mice.
- Beta-cell dysfunction was chronic and severe in TSP-1 deficient mice, with adult islets failing to recover function after TSP-1 reconstitution.
Conclusions:
- TSP-1 deficiency causes dynamic vascular and endocrine alterations in islets postnatally.
- TSP-1 deficiency leads to chronic and irreversible beta-cell dysfunction if not corrected early in life.
