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Journal of Virology, September 2006, p. 8940-8950, Vol. 80, No. 18
0022-538X/06/$08.00+0 doi:10.1128/JVI.00724-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
The Jake Gittlen Cancer Research Foundation and Department of Pathology,1 Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033,2 Department of Dermatology, Stanford University School of Medicine, Stanford, California 94305,3 INSERM U634, Faculté de Médecine, Université de Nice, F-06107 Nice Cedex, France4
Received 10 April 2006/ Accepted 27 June 2006
Human papillomaviruses (HPVs) replicate only in the terminally differentiating epithelium of the skin and mucosa. While infection of basal keratinocytes is considered a requirement for permissive infection, it remains unclear whether virions can specifically target basal cells for adsorption and uptake following epithelial wounding. We present evidence that HPV binds specifically to laminin 5 (LN5), a component of the extracellular matrix (ECM) secreted by migrating and basal keratinocytes. HPV type 11 capsids colocalized with LN5 in the ECM secreted by vaginal keratinocytes. Binding of both virions and virus-like particles to purified LN5 and to the LN5-rich ECM secreted by cultured keratinocytes was effectively blocked by pretreatment with anti-LN5 antibodies. HPV capsid binding to human cervical mucosa sections included the basement membrane which contains LN5. Cultured keratinocytes expressing
6 integrin, a transmembrane protein known to bind LN5, were readily infected by virions preadsorbed to LN5-containing substrates, whereas mutant keratinocytes lacking
6 integrin were relatively resistant to infection via this route. These findings suggest a model of natural HPV infection in which proliferating keratinocytes expressing
6 integrin at the site of epithelial wounding might be targeted by virions adsorbed transiently to LN5 secreted by migrating keratinocytes.
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