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Leukocyte kinetics in pulmonary microcirculation: intravital fluorescence microscopic study
W M Kuebler1, G E Kuhnle, J Groh
1Institute for Surgical Research, Ludwig-Maximilians-University, Munich, Germany.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1994
Summary
Leukocyte sequestration in the lung involves retention in capillaries and interactions within arterioles and venules. These processes regulate the balance between circulating and sequestered leukocytes.
Area of Science:
- Pulmonary physiology
- Immunology
- Microcirculation research
Background:
- Leukocyte sequestration in the lung is a critical process in inflammatory responses.
- Understanding the specific sites and mechanisms of leukocyte sequestration is essential for developing targeted therapies.
Purpose of the Study:
- To identify the primary sites of leukocyte sequestration within the pulmonary microcirculation.
- To investigate the dynamic interactions of leukocytes with pulmonary vessels in vivo.
Main Methods:
- Utilized fluorescence videomicroscopy in a rabbit model with a transparent thoracic window.
- Administered fluorescently labeled erythrocytes and leukocytes (rhodamine 6G) intravenously.
- Quantified leukocyte velocity and adherence in pulmonary arterioles, venules, and alveolar capillaries.
Main Results:
- Leukocyte adherence and rolling were observed in both arterioles and venules.
- Leukocyte velocity was significantly higher in arterioles compared to venules.
- Leukocytes were retained at specific sites within alveolar capillaries for extended periods.
Conclusions:
- Leukocyte sequestration in the lung is a multifactorial process involving capillary retention and endothelial interactions in arterioles and venules.
- The kinetics of leukocyte behavior in the pulmonary microcirculation govern the equilibrium between circulating and sequestered leukocytes.
- These findings provide insights into the dynamic regulation of leukocyte distribution in the lung.