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Isolation and preliminary in vitro characterization of the porcine pulmonary intravascular macrophage

, : Isolation and preliminary in vitro characterization of the porcine pulmonary intravascular macrophage. Journal of Leukocyte Biology 43(5): 403-410

Porcine intravascular macrophages were isolated by perfusion of the pulmonary vasculature with 0.1% collagenase solution. The isolated cells formed intercellular adhesion plaques with endothelial cells when incubated with porcine pulmonary artery, aorta, and corneal cups. Intercellular adhesion plaques were focal junctionlike membrane specializations consisting of paired submembranous amorphous densities subjacent to 15-20 nm gaps between parallel apposing cell membranes. The intermembranous space was filled with moderately electron dense, finely granular material. Adhesion plaques formed in 4-8 hours and resembled the adhesion plaques formed between pulmonary intravascular macrophages and endothelium in vivo. Alveolar macrophages and peripheral blood monocytes did not form intercellular adhesion plaques with endothelial cells. Intravascular macrophages had histologic and ultrastructural features of macrophages, were alpha naphthyl butyrate esterase positive, adhered to plastic coverslips after 1 hour of incubation, and were smaller than alveolar macrophages and endothelial cells. The formation of intercellular adhesion plaques in vivo and in vitro by cells with morphologic and histochemical features of macrophages distinguishes intravascular macrophages from monocytes and alveolar macrophages.

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Accession: 001871708

PMID: 3163716

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