Growth restriction of an experimental live attenuated human parainfluenza virus type 2 vaccine in human ciliated airway epithelium in vitro parallels attenuation in African green monkeys.
Human parainfluenza viruses (HPIVs) are common causes of severe pediatric respiratory viral disease. We characterized wild-type HPIV2 infection in an in vitro model of human airway epithelium (HAE) and found that the virus replicates to high titer, sheds apically, targets ciliated cells, and induces minimal cytopathology. Replication of an experimental, live attenuated HPIV2 vaccine strain, containing both temperature sensitive (ts) and non-ts attenuating mutations, was restricted >30-fold compared to rHPIV2-WT in HAE at 32 degrees C and exhibited little productive replication at 37 degrees C. This restriction paralleled attenuation in the upper and lower respiratory tract of African green monkeys, supporting the HAE model as an appropriate and convenient system for characterizing HPIV2 vaccine candidates.
Laboratory of Infectious Diseases, RNA Viruses Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892-2007, USA.
Anne
A
Schaap-Nutt
Margaret A
MA
Scull
Alexander C
AC
Schmidt
Brian R
BR
Murphy
Raymond J
RJ
Pickles
D000818:Animals; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D006801:Humans; D009924:Organ Culture Techniques; D010223:Parainfluenza Virus 2, Human / Q000254:growth & development* / Q000472:pathogenicity; D020545:Respiratory Mucosa / Q000821:virology*; D019351:Rubulavirus Infections / Q000473:pathology / Q000821:virology; D014613:Vaccines, Attenuated; D014765:Viral Vaccines; D014774:Virulence
D014613:Vaccines, Attenuated; D014765:Viral Vaccines