Long-term viral enhancement of lung response to Saccharopolyspora rectivirgula.
The current study was done to look at the long-term enhancing effect of a single viral infection on repeated Saccharopolyspora rectivirgula (SR) antigenic challenges in mice and at inflammatory cytokines in this enhancement. Four groups of C57BI/6 mice were studied: Group 1 received intranasal instillations of saline, 3 days per week; Group 2, intranasal instillations of saline plus one intranasal instillation of 80 hemagglutination units (HAU) of Sendai virus after 3 wk of saline; Group 3, instillations of SR, 3 days per week; and Group 4, instillations of SR, 3 days per week, plus one instillation of Sendai virus after 3 wk of SR. Bronchoalveolar lavages (BAL) were performed 15 and 30 wk after the virus inoculation in the appropriate groups. Each time, a two- to threefold increase in BAL cell counts was obtained from virus-infected animals challenged with SR compared with animals that received the SR alone. Animals infected with virus only showed values similar to those of control animals. A higher percentage of large foamy multinucleated cells were found in the BAL from the SR+Sendai group than the SR alone group (7.92 +/- 0.730% compared with 1.8 +/- 0.296%). These cells were not seen in the other groups. BAL levels of TNF-alpha and IL-1 alpha at 15 wk were much higher in SR+Sendai-treated (1,439 +/- 268 and 96 +/- 9 pg/ml, respectively) than SR alone-treated animals (361 +/- 100 and 23 +/- 4 pg/ml). BAL fluid of control animals and Sendai alone animals contained 64 +/- 24 and 65 +/- 15 pg/ml of TNF-alpha, but no IL-1 alpha was detected.(ABSTRACT TRUNCATED AT 250 WORDS)
Cormier
Y
Y
Unité de Recherche, Centre de Pneumologie, Hôpital Laval, Université Laval, Sainte-Foy, Québec, Canada.
Tremblay
G M
GM
Fournier
M
M
Israël-Assayag
E
E
D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D005203:Farmer's Lung / Q000276:immunology / Q000382:microbiology*; D007375:Interleukin-1 / Q000096:biosynthesis; D008168:Lung / Q000276:immunology* / Q000382:microbiology / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D010222:Parainfluenza Virus 1, Human / Q000276:immunology*; D018184:Paramyxoviridae Infections / Q000276:immunology*; D016930:Saccharopolyspora / Q000276:immunology*; D013047:Specific Pathogen-Free Organisms; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
D000942:Antigens, Bacterial; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha