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Department of Functional and Applied Anatomy, Medical School of Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.
In allergic and inflammatory immune reactions of the respiratory tract, leukocytes migrate into the different compartments of the lung. The air space can easily be sampled by means of bronchoalveolar lavage. However, the subset composition in the bronchial wall or the lung interstitium often differs considerably from that of the bronchoalveolar lavage fluid. A further compartment involved in very heterogeneous immune reactions in the lung has thus far not been mentioned: the periarterial space. In numerous experiments in different species with virus, bacteria, fungi, or allergens, there was not only a leukocyte infiltration of the bronchial lamina propria but also infiltration around branches of the pulmonary artery. This thus far neglected compartment consists of a different type of capillary. Thus it is important not to overlook this area in studies on allergic or inflammatory immune reactions of the lung.
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