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Pulmonary Dendritic Cells

Department of Respiratory Diseases, Ghent University Hospital, Ghent, Belgium

Correspondence and requests for reprints should be addressed to K. Vermaelen, M.D., PhD., Department of Respiratory Diseases, Ghent University Hospital, 7K12ie, De Pintelaan 185, Ghent B-9000, Belgium. E-mail: karim.vermaelen{at}ugent.be

Dendritic cells (DCs) are leukocytes that are emerging as chief orchestrators of immune responses. The crucial task of DCs is the continuous surveillance of antigen-exposed sites throughout the body, and their unique responsibility is to decide whether to present sampled antigen in an immunogenic or tolerogenic way. Any misstep can either lead to a flawed immune defense or to allergy, even autoimmunity. It comes as no surprise that the lungs become increasingly the subject of DC-related investigations, as they represent a vast interface between the body and the outer world. This constitutes an enormous challenge for the immune system: "firing up" immune responses inappropriately could have devastating results for the fragile gas exchange structures. Evidence accumulates that DCs play a pivotal role in maintaining the delicate balance between tolerance and active immune response in our respiratory system. The exponentially growing body of DC-related publications is a big challenge. This article aims to provide researchers and clinicians with an up-to-date view on DC biology and its relevance to pulmonary medicine. A developing trend in the field of DCs is the shift from fundamental immunologic research toward exciting clinical insights and applications. For the pulmonary clinician, this heralds the dawn of promising therapies in various domains such as infections, allergy, and cancer.

Key Words: airway • chemokine • chronic obstructive pulmonary disease • dendritic cell • lymph node

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