Related Experiment Video
Updated: Jul 18, 2026
09:43
Improved Protocol For Laser Microdissection Of Human Pancreatic Islets From Surgical Specimens
Published on: January 6, 2013
Changes in gene expression in beta cells after islet isolation and transplantation using laser-capture
1Section on Islet Transplantation and Cell Biology, Research Division, Joslin Diabetes Center and the Department of Medicine, Harvard Medical School, Boston, MA 02215, USA.
Diabetologia
|December 21, 2006
Summary
Islet isolation and transplantation alter beta cell gene expression. Beta cells in grafts show reduced insulin production genes and increased stress genes compared to endogenous islets.
Area of Science:
- Endocrinology
- Molecular Biology
- Transplantation Biology
Background:
- Islet isolation and transplantation can induce beta cell injury.
- Post-transplant hyperglycemia can impair beta cell function.
Purpose of the Study:
- To evaluate gene expression changes in endogenous islets using laser-capture microdissection (LCM).
- To compare gene expression profiles of islets in situ, freshly isolated, cultured, and transplanted.
Main Methods:
- Islets from B6AF1 mice were studied in situ, freshly isolated, or cultured.
- Islets were transplanted into diabetic or non-diabetic syngeneic mice.
- Laser-capture microdissection (LCM) isolated beta cell-enriched tissue for RNA extraction and RT-PCR analysis of key genes.
Main Results:
- Freshly isolated and cultured islets showed a 40% decrease in insulin and Ipf1 (Insulin 1, pancreatic and duodenal homeobox 1) mRNA levels.
- Stress-related genes (Hmox1, Gpx1, Tnfaip3, Fas) were upregulated in isolated and cultured islets.
- Engrafted beta cells in successfully transplanted mice exhibited reduced Ipf1 expression compared to in situ islets.
Conclusions:
- Islet isolation and transplantation lead to decreased expression of insulin production genes and increased expression of stress genes in beta cells.
- Even successful islet grafts demonstrate distinct gene expression profiles compared to endogenous islets.
- These findings highlight the impact of isolation and graft environment on beta cell function at the molecular level.
