title: An unusual dependence of human herpesvirus-8 glycoproteins-induced cell-to-cell fusion on heparan sulfate.
abstract: Human herpesvirus-8 (HHV-8) is known to interact with cell surface heparan sulfate (HS) for entry into a target cell. Here we investigated the role of HS during HHV-8 glycoproteins-induced cell fusion. Interestingly, the observed fusion demonstrated an unusual dependence on HS as evident from following lines of evidence: (1) a significant reduction in cell-to-cell fusion occurred when target cells were treated with heparinase; (2) in a competition assay, when the effector cells expressing HHV-8 glycoproteins were challenged with soluble HS, cell-to-cell fusion was reduced; and, (3) co-expression of HHV-8 glycoproteins gH-gL on target cells resulted in inhibition of cell surface HS expression. Taken together, our results indicate that cell surface HS can play an additional role during HHV-8 pathogenesis.
authors.affiliation: Department of Ophthalmology, University of Illinois at Chicago, IL 60612, USA.
authors.forename: Vaibhav
authors.initials: V
authors.lastname: Tiwari
authors.forename: Nissar A
authors.initials: NA
authors.lastname: Darmani
authors.forename: Gerald R
authors.initials: GR
authors.lastname: Thrush
authors.forename: Deepak
authors.initials: D
authors.lastname: Shukla
mesh_terms: D000818:Animals; D016466:CHO Cells; D002459:Cell Fusion; D002462:Cell Membrane / Q000378:metabolism / Q000821:virology; D006224:Cricetinae; D003412:Cricetulus; D006497:Heparan Sulfate / Q000378:metabolism*; D006566:Herpesviridae Infections / Q000378:metabolism*; D019288:Herpesvirus 8, Human / Q000378:metabolism*; D006801:Humans; D008561:Membrane Fusion; D014759:Viral Envelope Proteins / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D006497:Heparan Sulfate; D014759:Viral Envelope Proteins; D014764:Viral Proteins; C116207:glycoprotein B, human herpesvirus 8; C464461:glycoprotein H, human herpesvirus 8; C534114:glycoprotein L, human herpesvirus 8