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Related Concept Videos

Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...

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Tissue engineering: selecting the optimal fixative for immunohistochemistry.

Sabine Koch1, Nadine Stappenbeck, Christian G Cornelissen

  • 1Department of Tissue Engineering & Textile Implants, Applied Medical Engineering, University Hospital Aachen, Aachen, Germany.

Tissue Engineering. Part C, Methods
|June 16, 2012
PubMed
Summary

Carnoy's fixative best preserves tissue-engineered vascular grafts for immunohistochemical analysis. This method enhances visualization of key proteins like alpha-smooth muscle actin (α-SMA) and collagen, crucial for tissue engineering research.

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Area of Science:

  • Tissue engineering
  • Biomaterials science
  • Histopathology

Background:

  • Aggressive fixation and antigen retrieval methods can compromise immunohistochemical staining quality in tissue-engineered structures.
  • Optimizing preservation techniques is essential for accurate analysis of engineered tissues.

Purpose of the Study:

  • To evaluate the impact of different fixatives and antigen retrieval methods on immunohistochemical staining of tissue-engineered vascular grafts.
  • To identify optimal fixation and retrieval protocols for preserving tissue architecture and antigenicity.

Main Methods:

  • Tissue-engineered vascular grafts were fixed with formalin, Carnoy's, or HOPE(®) fixative.
  • Hematoxylin and eosin staining assessed overall tissue preservation.
  • Immunohistochemical staining was performed for cardiovascular proteins (α-SMA, vimentin, collagen types I & III, elastin, laminin).

Main Results:

  • Formalin fixation with antigen retrieval caused significant tissue destruction.
  • Carnoy's fixation yielded good preservation and staining for α-SMA, vimentin, type I collagen, elastin, and laminin.
  • HOPE fixative resulted in loosened structure but adequate staining for type III collagen and elastin.
  • Formalin fixation without retrieval showed inadequate visualization of most target proteins.

Conclusions:

  • Carnoy's fixative is recommended for preserving tissue-engineered constructs for immunohistochemical analysis of key cardiovascular proteins.
  • The optimal technique requires tailoring to specific tissue engineering applications and analytical goals.