title: Detection and localization of ApxI, -II and -III genes of Actinobacillus pleuropneumoniae in natural porcine pleuropneumonia in natural porcine pleuropneumonia by in situ hybridization.
abstract: In situ hybridization techniques that employed a nonradioactive digoxigenin-labeled probe were used to detect and localize ApxI, II and III genes in tissue sections of pneumonic lung naturally infected with Actinobacillus pleuropneumoniae. In pigs infected with either serotype 2 or 6, a hybridization signal for apxIICA, apxIIICA, apxIBD, and apxIIIBD was detected, and in pigs infected with serotype 5, a hybridization signal for apxICA, apxIICA, and apxIBD was detected in the pneumonic lesions. A hybridization signal for apxIICA and apxIBD was detected in pigs infected with serotype 7. A strong hybridization signal for apx genes was seen in streaming degenerate alveolar leukocytes bordering zones of coagulative necrosis. Simultaneous detection of hybridization signals for the apxCA and apxBD genes provided scientific evidence that the expression of the apx genes could be potential indicators of the production of corresponding Apx toxins. This study demonstrates the expression of ApxI, II, and III genes in pneumonic lesions caused by A. pleuropneumoniae.
authors.affiliation: Department of Veterinary Pathology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Kyounggi-Do, Republic of Korea.
authors.forename: C
authors.initials: C
authors.lastname: Choi
authors.forename: D
authors.initials: D
authors.lastname: Kwon
authors.forename: K
authors.initials: K
authors.lastname: Min
authors.forename: C
authors.initials: C
authors.lastname: Chae
mesh_terms: D000189:Actinobacillus Infections / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D016977:Actinobacillus pleuropneumoniae / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics; D001427:Bacterial Toxins / Q000737:chemistry / Q000235:genetics*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification; D006460:Hemolysin Proteins; D017403:In Situ Hybridization / Q000662:veterinary; D008168:Lung / Q000382:microbiology / Q000473:pathology; D011001:Pleuropneumonia / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D016133:Polymerase Chain Reaction / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology* / Q000473:pathology
chemical_list: C085361:ApxII toxin, bacteria; C079721:ApxIII toxin protein, Actinobacillus; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004269:DNA, Bacterial; D006460:Hemolysin Proteins; C087744:ApxI toxin, Bacteria