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In-situ Hybridization02:31

In-situ Hybridization

In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...

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Surface Engineering of Pancreatic Islets with a Heparinized StarPEG Nanocoating
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Islet surface modification with urokinase through DNA hybridization.

Naohiro Takemoto1, Yuji Teramura, Hiroo Iwata

  • 1Department of Reparative Materials, Institute for Frontier Medical Sciences, Kyoto University , 53 Kawahara-Cho, Shogoin, Sakyo-Ku, Kyoto 606-8507, Japan.

Bioconjugate Chemistry
|March 24, 2011
PubMed
Summary

This study conjugates urokinase onto islet surfaces using DNA hybridization to prevent early graft loss after transplantation for type I diabetes. This method maintains islet function and reduces inflammatory reactions, improving transplant success rates.

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Area of Science:

  • Biomaterials Science
  • Transplantation Immunology
  • Endocrinology

Background:

  • Islet transplantation is a potential treatment for type I diabetes.
  • Significant early islet loss occurs after intraportal transplantation due to coagulation and inflammation.
  • Current methods face challenges in preserving islet viability post-transplantation.

Purpose of the Study:

  • To develop a method for conjugating urokinase onto the surface of islets.
  • To prevent early islet graft loss mediated by instant blood coagulation.
  • To maintain islet morphology and function after surface modification.

Main Methods:

  • Synthesized amphiphilic polymers (oligo(dT)(20)-PEG-lipid) and urokinase (UK) carrying complementary DNA strands.
  • Utilized DNA hybridization to conjugate UK onto the islet surface via PEG-lipid incorporation into the cell membrane.
  • Assessed UK activity, islet morphology, and insulin secretion post-modification.

Main Results:

  • Successfully conjugated active urokinase onto the islet surface while maintaining its enzymatic activity.
  • Surface modification did not alter islet morphology or insulin secretory function.
  • The method prevented significant volume increase, suggesting suppression of early graft loss.

Conclusions:

  • DNA hybridization offers a novel approach to surface functionalization of islets for transplantation.
  • This technique can mitigate early islet loss by conjugating fibrinolytic enzymes like urokinase.
  • The method holds promise for improving the efficacy of islet transplantation in type I diabetes treatment.