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Respiratory Syncytial Virus Infection Disrupts Monolayer Integrity and Function in Cystic Fibrosis Airway Cells
Departments of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA
The Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama, 35233, USA
Departments of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA
Center for Global Health, Colorado School of Public Health, 13199 E Montview Blvd, Suite 310, A090 Aurora, CO 80045, USA
* Author to whom correspondence should be addressed.
Received: 13 May 2013; in revised form: 12 September 2013 / Accepted: 16 September 2013 / Published: 19 September 2013
Abstract: Background: Respiratory Syncytial Virus (RSV) infection is a common contributor to pulmonary symptoms in children with cystic fibrosis (CF). Here we examined RSV infection in immortalized bronchial epithelial cells (CFBE41o-) expressing wild-type (wt) or F508del cystic fibrosis transmembrane conductance regulator (CFTR), for monolayer integrity and RSV replication. Methods: CFBE41o- monolayers expressing wt or F508del CFTR were grown on permeable supports and inoculated with RSV A2 strain. Control experiments utilized UV-inactivated RSV and heat-killed RSV. Monolayer resistance and RSV production was monitored for up to six days post-infection. Results: Within 24 h, a progressive decrease in monolayer resistance was observed in RSV infected F508del CFBE41o- cells, while the monolayer integrity of RSV infected wt CFTR CFBE41o- cells remained stable. RSV replication was necessary to disrupt F508del CFBE41o- monolayers as UV-irradiated and heat killed RSV had no effect on monolayer integrity, with an earlier and much more pronounced peak in RSV titer noted in F508del relative to wt CFTR-expressing cells. RSV infection of wt CFBE41o- monolayers also resulted in blunting of CFTR response. Conclusions: These findings identify an enhanced sensitivity of CFBE41o- cells expressing F508del CFTR to RSV infection, replication and monolayer disruption independent of the cellular immune response, and provide a novel mechanism by which cystic fibrosis airway epithelia are susceptible to RSV-dependent injury.
Keywords: Respiratory Syncytial Virus; bronchial epithelial cells; cystic fibrosis; F508del cystic fibrosis transmembrane conductance regulator (CFTR)
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Kong, M.; Maeng, P.; Hong, J.; Szczesniak, R.; Sorscher, E.; Sullender, W.; Clancy, J.P. Respiratory Syncytial Virus Infection Disrupts Monolayer Integrity and Function in Cystic Fibrosis Airway Cells. Viruses 2013, 5, 2260-2271.
Kong M, Maeng P, Hong J, Szczesniak R, Sorscher E, Sullender W, Clancy JP. Respiratory Syncytial Virus Infection Disrupts Monolayer Integrity and Function in Cystic Fibrosis Airway Cells. Viruses. 2013; 5(9):2260-2271.
Kong, Michele; Maeng, Patrick; Hong, Jeong; Szczesniak, Rhonda; Sorscher, Eric; Sullender, Wayne; Clancy, John P. 2013. "Respiratory Syncytial Virus Infection Disrupts Monolayer Integrity and Function in Cystic Fibrosis Airway Cells." Viruses 5, no. 9: 2260-2271.