The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/3/885/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 5, March 3, 1997 885-892


Articles

Allergic Eosinophil-rich Inflammation Develops in Lungs and Airways of B Cell–deficient Mice

Magnus Korsgren*, Jonas S. Erjef ält*,{ddagger}, Olle Korsgren§, Frank Sundler*, and Carl G.A. Persson{ddagger},||

From the * Department of Physiology and Neuroscience, Lund University Hospital, 221 85 Lund, Sweden; {ddagger} Department of Pharmacology, Astra-Draco, 221 00 Lund, Sweden; § Department of Clinical Immunology and Transfusion Medicine, Uppsala University Hospital, 751 85 Uppsala, Sweden; and || Department of Clinical Pharmacology, Lund University Hospital, 221 85 Lund, Sweden

Immunoglobulins (Ig), particularly IgE, are believed to be crucially involved in the pathogenesis of asthma and, equally, in allergic models of the disease. To validate this paradigm we examined homozygous mutant C57BL/6 mice, which are B cell deficient, lacking all Ig. Mice were immunized intraperitoneally with 10 µg ovalbumin (OVA) plus alum, followed by daily (day 14–20) 30 min exposures to OVA aerosol (OVA/OVA group). Three control groups were run: OVA intraperitoneally plus saline (SAL) aerosol (OVA/SAL group); saline intraperitoneally plus saline aerosol; saline intraperitoneally plus OVA aerosol (n = 6–7). Lung and large airway tissues obtained 24 h after the last OVA or SAL exposure were examined by light microscopy and transmission electron microscopy (TEM). The Ig-deficient mice receiving OVA/ OVA treatment had swollen and discolored lungs and exhibited marked eosinophilia both in large airway subepithelial tissue (49.2 ± 12.0 cells/mm basement membrane [BM] versus OVA/ SAL control 1.2 ± 0.3 cells/mm BM; P <0.001), and perivascularly and peribronchially in the lung (49.3 ± 9.0 cells/unit area versus OVA/SAL control 2.6 ± 0.6 cells/unit area; P <0.001). The eosinophilia extended to the regional lymph nodes. TEM confirmed the subepithelial and perivascular localization of eosinophils. Mucus cells in large airway epithelium increased from 1.5 ± 0.8 (OVA/SAL mice) to 39.5 ± 5.7 cells/mm BM in OVA/OVA treated mice (P <0.001). OVA/SAL mice never differed from the other control groups. Corresponding experiments in wild-type mice (n = 6–7 in each group) showed qualitatively similar but less pronounced eosinophil and mucus cell changes. Macrophages and CD4+ T cells increased in lungs of all OVA/OVA-treated mice. Mast cell number did not differ but degranulation was detected only in OVA/OVA-treated wild-type mice. Immunization to OVA followed by OVA challenges thus cause eosinophil-rich inflammation in airways and lungs of mice without involvement of B cells and Ig.


Address correspondence to Magnus Korsgren, Department of Physiology and Neuroscience, Neuroendocrine Cell Biology, E-blocket, University Hospital, 221 85 Lund, Sweden.

1Abbreviations used in this paper: BAL, bronchoalveolar lavage fluids; Cfegs, clusters of free eosinophil granules; EPO, eosinophil peroxidase; PAS, periodic acid–Schiff reagent; SAL, saline; TEM, transmission electron microscopy.


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