Related Experiment Videos
Improved islet survival and in vitro function using solubilized small intestinal submucosa.
J R Lakey1, E J Woods, M A Zieger
1University of Alberta, Surgical-Medical Research Institute, Department of Surgery, 1074 Dentistry/Pharmacy Centre, Edmonton, T6G 2N8, Canada(jonathan.lakey@ualberta.ca)
Cell and Tissue Banking
|July 17, 2004
Summary
Small intestinal submucosa (SIS) enhances recovery and function of cultured pancreatic islets. This extracellular matrix improves islet survival and insulin response, offering potential for islet transplantation therapies.
Area of Science:
- Regenerative Medicine
- Endocrinology
- Biomaterials Science
Background:
- Scarcity of clinical islet donors necessitates improved in vitro islet expansion techniques.
- Small intestinal submucosa (SIS), a natural extracellular matrix, shows promise in tissue regeneration and cell growth.
- Optimizing in vitro culture conditions is crucial for enhancing islet recovery and function for transplantation.
Purpose of the Study:
- To evaluate the impact of solubilized SIS on the recovery and function of canine pancreatic islets during in vitro culture.
- To compare the efficacy of SIS-supplemented culture medium with standard fetal calf serum (FCS) medium.
- To assess islet viability, insulin response, and cell proliferation following SIS co-culture.
Main Methods:
- Canine pancreatic islets were isolated and cultured for 48 hours in CMRL 1066 medium supplemented with either FCS or solubilized SIS.
- Islet recovery was quantified by volume and cell counts.
- Islet viability and function were assessed via static incubation with varying glucose concentrations and IBMX.
- Histological analysis was performed to evaluate cell distribution and proliferation markers (PCNA).
Main Results:
- Co-culture with SIS significantly increased islet recovery (84.5% vs. 64.7% in FCS controls, p < 0.05).
- SIS-treated islets demonstrated a significantly higher insulin response to glucose stimulation (stimulation index 12.3 vs. 5.6, p < 0.05).
- Histological evaluation revealed a higher frequency of insulin-positive cells in the SIS-treated group, with evidence of proliferation (PCNA).
Conclusions:
- Solubilized SIS co-culture improves post-culture recovery and in vitro function of isolated canine pancreatic islets.
- SIS appears to support islet survival and enhance glucose-stimulated insulin secretion.
- Further research into SIS-islet cellular interactions is warranted for potential therapeutic applications in islet transplantation.