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Related Experiment Video

Updated: Nov 25, 2025

Whole Animal Perfusion Fixation for Rodents
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Perfusion fixation methods for preclinical biodistribution studies: A comparative assessment using automated image

Rania Belhadjhamida1, Harriet Lea-Banks1,2, Kullervo Hynynen1,2,3

  • 1Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada.

Methods and Applications in Fluorescence
|December 14, 2020
PubMed
Summary

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Dual-targeted perfusion effectively removes red blood cells (RBCs) and improves consistency in pre-clinical biodistribution studies. This novel technique enhances organ fixation for more accurate therapeutic and biomaterial research.

Area of Science:

  • Pre-clinical research
  • Histology
  • Biodistribution studies

Background:

  • Effective perfusion and fixation of organs are crucial for studying the biodistribution of novel therapeutics and biomaterials in vivo.
  • Standard transcardial perfusion methods include brain-targeted (left ventricle) and lung-targeted (right ventricle) approaches for red blood cell (RBC) removal and tissue fixation.

Purpose of the Study:

  • To compare the efficacy and consistency of three whole-body perfusion techniques for RBC removal and tissue fixation.
  • To introduce and evaluate a novel 'dual-targeted' perfusion method.

Main Methods:

  • Utilized autofluorescence measurements to quantify RBC content in histology.
  • Developed a custom ImageJ macro for RBC quantification.
  • Compared brain-targeted, lung-targeted, and a novel dual-targeted perfusion approach.
Keywords:
autofluorescencehistologyimage segmentation

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Last Updated: Nov 25, 2025

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Main Results:

  • Lung-targeted perfusion removed more RBCs from lung vasculature than brain-targeted perfusion (20 ± 54% fewer RBCs).
  • Dual-targeted perfusion demonstrated higher efficacy, reducing RBCs by 30 ± 6% compared to other methods.
  • Dual-targeted perfusion achieved significantly greater consistency in organ autofluorescence (64% and 65% lower variance than brain- and lung-targeted methods, respectively).

Conclusions:

  • Dual-targeted perfusion offers superior efficacy and consistency for whole-body perfusion fixation in pre-clinical studies.
  • This method minimizes confounding factors like RBC content and autofluorescence in biodistribution assessments.
  • The findings provide valuable insights for optimizing perfusion fixation techniques in research involving fluorescent probes.