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(American Journal of Pathology. 2004;164:1021-1030.)
© 2004 American Society for Investigative Pathology

The Innate Pulmonary Granuloma

Characterization and Demonstration of Dendritic Cell Recruitment and Function

Bo-Chin Chiu*, Christine M. Freeman*, Valerie R. Stolberg{dagger}, Jerry S. Hu*, Eric Komuniecki* and Stephen W. Chensue*{dagger}

From the Department of Pathology,*University of Michigan Medical School, Ann Arbor; and the Department of Pathology and Laboratory Medicine,{dagger}Veterans Administration Ann Arbor Healthcare System, Ann Arbor, Michigan

Granulomas are innate sequestration responses that can be modified by superimposed acquired immune mechanisms. The present study examined the innate stage of pulmonary granuloma responses to bead-immobilized Th1- and Th2-inducing pathogen antigens (Ags), Mycobacteria bovis purified protein derivative (PPD) and Schistosoma mansoni soluble egg Ags (SEA). Compared to a nonpathogen Ag, PPD and SEA bead elicited larger lesions with the former showing accelerated inflammation. Temporal analyses of cytokine and chemokine transcripts showed all Ag beads induced tumor necrosis factor-{alpha} mRNA but indicated biased interleukin (IL)-1, IL-6, and IL-12 expression with PPD challenge. All beads elicited comparable levels of CXCL9, CXL10, CCL2, CCL17, and CCL22 mRNA, but PPD beads caused biased CXCL2 CXCL5, CCL3, and CCL4 expression whereas both pathogen Ags induced CCL7. Immunohistochemical, electron microscopic, and flow cytometric analyses showed that Ag beads mobilized CD11c+ dendritic cells (DCs) of comparable maturation. Transfer of DCs from PPD Ag-challenged lungs conferred a Th1 anamnestic cytokine response in recipients. Surprisingly, transfer of DCs from the helminth SEA-challenged lungs did not confer the expected Th2 response, but instead rendered recipients incapable of Ag-elicited IL-4 production. These results provide in vivo evidence that lung DCs recruited under inflammatory conditions favor Th1 responses and alternative mechanisms are required for Th2 commitment.




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