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Phagocytosis and killing of Actinobacillus pleuropneumoniae by alveolar macrophages and polymorphonuclear leukocytes isolated from pigs. 1992

T L Cruijsen, and L A Van Leengoed, and T C Dekker-Nooren, and E J Schoevers, and J H Verheijden
Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, University of Utrecht, The Netherlands.

To study the cellular response of phagocytic cells to Actinobacillus pleuropneumoniae, we investigated whether porcine alveolar macrophages (AM) and polymorphonuclear leukocytes (PMN) are able to phagocytize and intracellularly kill A. pleuropneumoniae in vitro. Bacterial cultivation methods of A. pleuropneumoniae were used to assess in vitro phagocytosis and the ability to kill. A specific-pathogen-free pig was killed, blood was collected, and PMN were isolated and counted. The AM were isolated by lung lavage of the same animal and counted. In addition, convalescent-stage serum was collected from a specific-pathogen-free pig that was infected with A. pleuropneumoniae. Both porcine AM and porcine PMN effectively phagocytized A. pleuropneumoniae in the presence of convalescent-stage pig serum. PMN killed 90 to 99% of the bacteria intracellularly, whereas AM did not. Because A. pleuropneumoniae produces exotoxins that kill porcine AM and porcine PMN, we incubated equal amounts of bacteria and phagocytic cells and tested the viability of the cells 120 min later. In the presence of convalescent-stage pig serum, A. pleuropneumoniae was toxic to AM but not to PMN. Probably in porcine AM, intracellular released toxins of A. pleuropneumoniae lessen the ability of the cell to kill the bacterium. Consecutive lysis of AM and release of viable A. pleuropneumoniae may initiate the characteristic porcine pleuropneumonia.

UI MeSH Term Description Entries
D008168 Lung Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood. Lungs
D009504 Neutrophils Granular leukocytes having a nucleus with three to five lobes connected by slender threads of chromatin, and cytoplasm containing fine inconspicuous granules and stainable by neutral dyes. LE Cells,Leukocytes, Polymorphonuclear,Polymorphonuclear Leukocytes,Polymorphonuclear Neutrophils,Neutrophil Band Cells,Band Cell, Neutrophil,Cell, LE,LE Cell,Leukocyte, Polymorphonuclear,Neutrophil,Neutrophil Band Cell,Neutrophil, Polymorphonuclear,Polymorphonuclear Leukocyte,Polymorphonuclear Neutrophil
D010587 Phagocytosis The engulfing and degradation of microorganisms; other cells that are dead, dying, or pathogenic; and foreign particles by phagocytic cells (PHAGOCYTES). Phagocytoses
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001427 Bacterial Toxins Toxic substances formed in or elaborated by bacteria; they are usually proteins with high molecular weight and antigenicity; some are used as antibiotics and some to skin test for the presence of or susceptibility to certain diseases. Bacterial Toxin,Toxins, Bacterial,Toxin, Bacterial
D013552 Swine Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA). Phacochoerus,Pigs,Suidae,Warthogs,Wart Hogs,Hog, Wart,Hogs, Wart,Wart Hog
D016676 Macrophages, Alveolar Round, granular, mononuclear phagocytes found in the alveoli of the lungs. They ingest small inhaled particles resulting in degradation and presentation of the antigen to immunocompetent cells. Alveolar Macrophages,Macrophages, Pulmonary,Pulmonary Macrophages,Macrophage, Pulmonary,Pulmonary Macrophage,Alveolar Macrophage,Macrophage, Alveolar
D016923 Cell Death The termination of the cell's ability to carry out vital functions such as metabolism, growth, reproduction, responsiveness, and adaptability. Death, Cell
D016977 Actinobacillus pleuropneumoniae A species of gram-negative, facultatively anaerobic coccobacillus-shaped bacteria that has been isolated from pneumonic lesions and blood. It produces pneumonia with accompanying fibrinous pleuritis in swine. Haemophilus pleuropneumoniae,Hemophilus pleuropneumoniae

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