Allergy Asthma Immunol Res.  2013 Jul;5(4):216-223. 10.4168/aair.2013.5.4.216.

Rhinovirus-Infected Epithelial Cells Produce More IL-8 and RANTES Compared With Other Respiratory Viruses

• Chun YH
• Park JY
• Lee H
• Kim HS
• Won S
• Joe HJ
• Chung WJ
• Yoon JS
• Kim HH
• Kim JT
• Lee JS

• KMID: 2260315
• DOI: http://doi.org/10.4168/aair.2013.5.4.216

Abstract

PURPOSE
The environmental factors human rhinoviruses (HRVs) and house dust mites (HDMs) are the most common causes of acute exacerbations of asthma. The aim of this study was to compare the chemokine production induced by HRVs in airway epithelial cells with that induced by other respiratory viruses, and to investigate synergistic interactions between HRVs and HDMs on the induction of inflammatory chemokines in vitro.
METHODS
A549 human airway epithelial cells were infected with either rhinovirus serotype 7, respiratory syncytial virus (RSV)-A2 strain, or adenovirus serotype 3 and analyzed for interleukin (IL)-8 and regulated on activation, normal T-cell expressed and secreted (RANTES) release and mRNA expression. Additionally, activation of nuclear factor (NF)-kappaB and activator protein (AP)-1 were evaluated. The release of IL-8 and RANTES was also measured in cells stimulated simultaneously with a virus and the HDM allergen, Der f1.
RESULTS
HRV caused greater IL-8 and RANTES release and mRNA expression compared with either RSV or adenovirus. NF-kappaB and AP-1 were activated in these processes. Cells incubated with a virus and Der f1 showed an increased IL-8 release. However, compared with cells incubated with virus alone as the stimulator, only HRV with Der f1 showed a statistically significant increase.
CONCLUSIONS
IL-8 and RANTES were induced to a greater extent by HRV compared with other viruses, and only HRV with Der f1 acted synergistically to induce bronchial epithelial IL-8 release. These findings may correspond with the fact that rhinoviruses are identified more frequently than other viruses in cases of acute exacerbation of asthma.

Keyword

Rhinovirus; asthma; regulated on activation, normal T-cell expressed and secreted; IL-8; Der f1

MeSH Terms

Adenoviridae
Antigens, Dermatophagoides
Arthropod Proteins
Asthma
Chemokine CCL5
Chemokines
Cysteine Endopeptidases
Epithelial Cells
Humans
Interleukin-8
Interleukins
NF-kappa B
Pyroglyphidae
Respiratory Syncytial Viruses
Rhinovirus
RNA, Messenger
Sprains and Strains
T-Lymphocytes
Transcription Factor AP-1
Viruses
Antigens, Dermatophagoides
Arthropod Proteins
Chemokine CCL5
Chemokines
Cysteine Endopeptidases
Interleukin-8
Interleukins
NF-kappa B
RNA, Messenger
Transcription Factor AP-1

Figure

• 

  Fig. 1 (A) Effects of viral infection on IL-8 release (mean [standard deviation]) from A549 cells, as assessed by ELISA. The increase in IL-8 release was as follows: rhinovirus>respiratory syncytial virus (RSV)=adenovirus>control. A549 cells were infected at 102 50% tissue culture infectious dose (TCID50)/mL (n=3). *P<0.05, compared with the control, †P<0.05, compared with adenovirus, ‡P<0.05, compared with RSV. (B) IL-8 mRNA expression in A549 cells infected with rhinovirus, RSV, or adenovirus at 10-1 to 102 TCID50/mL. The mRNA expression of IL-8 occurred in decreasing order at 24 hr after infection with rhinovirus, RSV, and adenovirus. TNF α (10 ng/mL) and IL-4 (10 ng/mL) were stimulators for the positive control. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was used as a housekeeping gene.

• 

  Fig. 2 (A) Effects of viral infection on RANTES release (mean [standard deviation]) from A549 cells, as assessed by ELISA. The increase in RANTES release was as follows: rhinovirus>RSV>adenovirus=control. A549 cells were infected at 102 TCID50/mL (n=3). *P<0.05, compared with the control, †P<0.05, compared with adenovirus, ‡P<0.05, compared with RSV. (B) RANTES mRNA expression in A549 cells infected with rhinovirus, RSV, or adenovirus at 10-1 to 102 TCID50/mL. The mRNA expression of RANTES occurred in decreasing order at 24 hr after infection with rhinovirus, RSV, and adenovirus. TNF-α (10 ng/mL) and IL-4 (10 ng/mL) were stimulators for the positive control. GAPHD was used as a housekeeping gene.

• 

  Fig. 3 (A) Phosphorylated subunits of NF-κB (pp65) were analyzed by SDS-PAGE. The band densities were determined by densitometry. Relative pp65 expressions were calculated as the pp65/β-actin ratio of control. (B) Effect of NF-κB inhibitor on the release of IL-8 and RANTES from A549 cells after 48 hr infection assessed by ELISA. All three viruses induced IL-8 and RANTES release compared with the control medium (*P<0.05). Fifty µM pyrollidine dithiocarbamate (PDTC) suppressed the release of IL-8 and RANTES in all three viruses compared with virus only (†P<0.05). Data are from three independent experiments and results are presented as the mean±standard deviation.

• 

  Fig. 4 (A) Phosphorylated subunits of AP-1 (p-c-Jun) were analyzed by SDS-PAGE. The band densities were determined by densitometry. Relative p-c-Jun expressions were calculated as the p-c-Jun/β-actin ratio of control. (B) Effect of AP-1 inhibitor on the release of IL-8 and RANTES from A549 cells 48 hr after infection assessed by ELISA. All three viruses induced increased IL-8 and RANTES release compared with the control medium (*P<0.05). Fifty µM SP600125C suppressed induction of IL-8 and RANTES by all three viruses compared with virus only (†P<0.05). Data are from three independent experiments and results are presented as mean±standard deviation.

• 

  Fig. 5 The release of IL-8 (mean [standard deviation]) from A549 cells after viral infection with or without exposure to dust mite allergen Der f1 (1 µg/mL) as assessed by ELISA. All stimuli induced an increase in IL-8 release compared with the control medium at 24 hr after infection. Only rhinovirus with Der f1 induced a greater increase in IL-8 release compared with single viral stimulation. Each virus was infected with 102 TCID50/mL (n=3). *P<0.05, compared with the control, †P<0.05, virus alone versus in combination with Der f1.

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