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Flow cytometric method using fluorescent microspheres to measure reticuloendothelial function or particulate
D A DuBose1, C Matthew, E Schroder
1U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA. ddubose@natick-ccmail.army.mil
Summary
This study introduces a new flow cytometry method using fluorescent microspheres to assess reticuloendothelial system (RES) function. This technique offers a more accurate and efficient way to study how the RES handles foreign particles.
Area of Science:
- Immunology
- Physiology
Background:
- The reticuloendothelial system (RES) plays a crucial role in vascular shock and environmental stress responses.
- Accurate assessment of RES function is vital for understanding these physiological conditions.
Purpose of the Study:
- To develop and validate a novel, precise method for evaluating RES function.
- To compare this new method with existing techniques for particulate clearance assays.
Main Methods:
- Administration of 1-micrometer fluorescent microspheres (FM) to Sprague-Dawley rats via jugular cannula.
- Analysis of blood and tissue samples using flow cytometry with phycoerythrin-labeled microspheres as an internal standard.
- Confirmation of microsphere clearance by fluorescent photomicroscopy.
Main Results:
- Fluorescent microspheres were preferentially cleared by the spleen, liver, and lung.
- The use of an internal standard significantly enhanced the precision of aspiration volume determination.
- The flow cytometry method demonstrated superior accuracy, reproducibility, and speed compared to traditional assays.
Conclusions:
- The described flow cytometry procedure provides a robust and efficient method for studying RES function.
- This technique offers significant advantages over conventional bacterial, radioactive, or carbon clearance assays.
- The method has the potential to improve data collection accuracy and speed in particulate transport studies.