Staphylococcal enterotoxins A and B enhance rhinovirus replication in A549 cells.
BACKGROUND
Staphylococcal enterotoxin A (SEA) and staphylococcal enterotoxin B (SEB) have been reported to be important in the pathogenesis of chronic rhinosinusitis (CRS). To elucidate the pathophysiological responses in the nasal mucosae of CRS patients associated with rhinovirus (RV) infection, we investigated the effects of SEA and SEB on RV infection in A549 cells.


METHODS
Changes in expression of intercellular adhesion molecule (ICAM) 1 were assessed by flow cytometry, and effects on cytokine secretion were measured by ELISA. The changes of ICAM-1, IL-1beta, IL-6, and IL-8 mRNA were assayed by real-time polymerase chain reaction. The effect of RV replication in the cells was assessed by viral culture, followed by determination of viral titer.


RESULTS
RV infection increased ICAM-1 expression and cytokine secretion, but the SEs did not further increase the RV-induced expression of ICAM-1, IL-1beta, IL-6, and IL-8 mRNA and protein. The SEs, however, induced dose-dependent increases in viral titer.


CONCLUSIONS
SEA and SEB enhanced rhinoviral replication in airway epithelial cells, indicating that airway epithelial cells with CRS are more favorable environments for RV infection.
Wang
Jong Hwan
JH
Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
Kwon
Hyun-Ja
HJ
Lee
Bong-Jae
BJ
Jang
Yong Ju
YJ
D000942:Antigens, Bacterial / Q000494:pharmacology*; D002478:Cells, Cultured; D004768:Enterotoxins / Q000494:pharmacology*; D004847:Epithelial Cells / Q000187:drug effects; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D053583:Interleukin-1beta / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012229:Rhinovirus / Q000187:drug effects / Q000502:physiology*; D014779:Virus Replication / Q000187:drug effects*
D000942:Antigens, Bacterial; D004768:Enterotoxins; D053583:Interleukin-1beta; D015850:Interleukin-6; D016209:Interleukin-8; D018799:Intercellular Adhesion Molecule-1; C026066:enterotoxin A, Staphylococcal; C031818:enterotoxin B, staphylococcal