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The Journal of Immunology, 1999, 163: 995-999.
Copyright © 1999 by The American Association of Immunologists

Effects of CD18 Deficiency on the Emigration of Murine Neutrophils During Pneumonia1

Joseph P. Mizgerd*, Bruce H. Horwitz2,{dagger}, Henry C. Quillen*, Martin L. Scott3,{dagger} and Claire M. Doerschuk4,*

* Physiology Program, Harvard School of Public Health, Boston, MA 02115; and {dagger} Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139

We hypothesized that CD18 deficiency would impair the ability of neutrophils to emigrate from pulmonary blood vessels during certain pneumonias. To directly compare the abilities of wild-type (WT) and CD18-deficient neutrophils to emigrate, mice with both types of leukocytes in their blood were generated by reconstituting the hemopoietic systems of lethally irradiated C57BL/6 mice with mixtures of fetal liver cells from WT and CD18-deficient mice. Percentages of CD18-deficient neutrophils in the circulating and emigrated pools were compared during experimental pneumonias. Similar percentages were observed in the blood and bronchoalveolar lavage fluid 6 or 24 h after intratracheal instillation of Streptococcus pneumoniae, demonstrating that no site on the CD18 molecule was required for either its adhesive or its signaling functions during neutrophil emigration. However, 6 h after instillation of Escherichia coli LPS or Pseudomonas aeruginosa, the percentage of CD18-deficient neutrophils in the bronchoalveolar lavage fluid was only about one-fourth of that observed in the blood. This difference persisted for at least 24 h after instillation of E. coli LPS. Thus, neutrophil emigration elicited by the Gram-negative stimuli E. coli LPS or P. aeruginosa was compromised by deficiency of CD18. These data, based on comparing WT and gene-targeted CD18-deficient neutrophils within the same animals, provide evidence for molecular pathways regulating neutrophil emigration, which could not be appreciated in previous studies with pharmacological blockade or genetic deficiency of CD18.




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