Activation of Neutrophils within Pulmonary Microvessels of Rabbits Exposed to Cigarette Smoke
| Autor: | S.F. Van Eeden, C. M. Doerschuk, A. R. Burns, James C. Hogg, Maria E. Klut |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Pulmonary and Respiratory Medicine
Pathology medicine.medical_specialty Neutrophils Clinical Biochemistry Macrophage-1 Antigen CD18 Lymphocyte Activation Antigens CD In vivo Smoke Tobacco medicine Animals L-Selectin Microscopy Immunoelectron Lung Molecular Biology Lagomorpha Receptors Leukocyte-Adhesion biology Cell Membrane Cell Biology Blood flow Flow Cytometry biology.organism_classification Immunohistochemistry Primary and secondary antibodies Plants Toxic Red blood cell medicine.anatomical_structure Carboxyhemoglobin CD18 Antigens biology.protein Rabbits Antibody Cell Adhesion Molecules |
| Zdroj: | American Journal of Respiratory Cell and Molecular Biology. 9:82-89 |
| ISSN: | 1535-4989 1044-1549 |
| DOI: | 10.1165/ajrcmb/9.1.82 |
| Popis: | Previous studies have shown that polymorphonuclear leukocytes (PMN) are delayed in the pulmonary capillaries by the presence of cigarette smoke. To determine if the PMN delayed by smoking are activated, we estimated the in vivo expression of CD11/CD18 and L-selectin on the surface of PMN in lungs and peripheral blood of rabbits because these molecules are known to be upregulated and downregulated, respectively, on the surface of activated PMN. New Zealand white rabbits (3.5 +/- 0.1 kg) were exposed to either air (n = 5) or cigarette smoke (n = 5), and we used an established protocol to measure pulmonary vascular blood flow, volume, and red blood cell (RBC) transit time in the left lung. The right lungs were then fixed in 0.025% glutaraldehyde and stored in liquid nitrogen. Ultrathin sections were immuno-labeled with either the anti-CD18 monoclonal antibody 60.3 or the anti-L-selectin antibody Dreg-200, followed by a secondary antibody conjugated to 10 nm colloidal gold. The target antigens were quantified by counting the number of gold particles per micron (G/microns) of PMN surface membrane. The data show that smoke exposure had no effect on pulmonary blood flow, volume, or RBC transit time. However, it increased the expression of CD11/CD18 on intravascular PMN in the upper region of the lung (control, 7.4 +/- 1.3 G/microns; smoke-exposed, 13.2 +/- 3.3 G/microns; P0.05) and decreased the expression of L-selectin on intravascular PMN in both the lower (control, 5.5 +/- 2.0 G/microns; smoke-exposed, 2.6 +/- 1.5 G/microns; P = 0.05) and the upper (control, 6.8 +/- 1.4 G/microns; smoke-exposed, 2.6 +/- 1.2 G/microns; P0.05) regions.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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