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Selective elimination of fibroblasts from pancreatic islet monolayers by basic fibroblast growth factor-saporin
G M Beattie1, D A Lappi, A Baird
1Lucy Thorne Whittier Children's Center, La Jolla, California.
Abstract:
Fibroblast proliferation regularly impedes the initiation and maintenance of pancreatic islet monolayers in culture. We recently characterized a specific cytotoxin to cells expressing the basic fibroblast growth factor receptor by conjugating the growth factor to saporin-6, a ribosome-inactivating protein. In contrast to untreated islets, isolated adult rat islets grown on a substrate prepared from bovine corneal endothelial cells and incubated with the mitotoxin at 10-nM concentration for 96 h were free of contaminating fibroblasts. Histological and functional studies revealed there was no damage to the islets. The results suggest that treatment of this cell type with basic fibroblast growth factor mitotoxins may be an important tool for culture of pure islets for physiological and clinical studies.
Insights
Fibroblast contamination hinders pancreatic islet culture. A new basic fibroblast growth factor (FGF) mitotoxin effectively eliminates fibroblasts without damaging islets, enabling pure islet cultures for research.
Area of Science:
- Cell Biology
- Regenerative Medicine
- Endocrinology
Background:
- Fibroblast proliferation is a major obstacle in establishing and maintaining pancreatic islet cultures.
- Contaminated cultures limit the utility of islets for physiological and clinical research.
Purpose of the Study:
- To develop a method for eliminating fibroblast contamination in pancreatic islet cultures.
- To assess the efficacy and safety of a novel basic fibroblast growth factor (FGF)-conjugated mitotoxin.
Main Methods:
- Conjugation of basic FGF to saporin-6, a ribosome-inactivating protein, to create a targeted mitotoxin.
- Incubation of isolated adult rat islets with the mitotoxin on a bovine corneal endothelial cell substrate.
- Histological and functional assessments of treated islets.
Main Results:
- A 10-nM concentration of the FGF-saporin-6 mitotoxin for 96 hours effectively eliminated contaminating fibroblasts.
- Treated islets showed no histological damage.
- Functional studies confirmed the integrity of the treated islets.
Conclusions:
- Basic FGF mitotoxins are a promising tool for generating pure pancreatic islet cultures.
- This method can facilitate physiological and clinical studies utilizing purified islets.