title: Serotype-specific entry of dengue virus into liver cells: identification of the 37-kilodalton/67-kilodalton high-affinity laminin receptor as a dengue virus serotype 1 receptor.
abstract: Dengue virus, the causative agent of dengue fever, dengue shock syndrome, and dengue hemorrhagic fever, infects susceptible cells by initially binding to a receptor(s) located on the host cell surface. Evidence to date suggests that receptor usage may be cell and serotype specific, and this study sought to identify dengue virus serotype 1 binding proteins on the surface of liver cells, a known target organ. By using a virus overlay protein binding assay (VOPBA), in both nondenaturing and denaturing gel systems, a putative dengue virus serotype 1 binding protein of approximately 37 kDa expressed on the surface of liver (HepG2) cells was identified. Mass spectrometry analysis identified a candidate protein, the 37/67-kDa high-affinity laminin receptor. Entry of the dengue virus serotype 1 was significantly inhibited in a dose-dependent manner by both antibodies directed against the 37/67-kDa high-affinity laminin receptor and soluble laminin. No inhibition of virus entry was seen with dengue virus serotypes 2, 3, or 4, demonstrating that the 37/67-kDa high-affinity laminin receptor is a serotype-specific receptor for dengue virus entry into liver cells.
authors.affiliation: Molecular Pathology Laboratory, Institute of Molecular Biology and Genetics, Mahidol University, 25/25 Phuttamontol Sai 4, Salaya, Nakorn Pathom, Thailand 73170.
authors.forename: Chutima
authors.initials: C
authors.lastname: Thepparit
authors.forename: Duncan R
authors.initials: DR
authors.lastname: Smith
mesh_terms: D000818:Animals; D002522:Chlorocebus aethiops; D003716:Dengue Virus / Q000145:classification / Q000502:physiology*; D008099:Liver / Q000821:virology*; D008970:Molecular Weight; D017474:Receptors, Laminin / Q000032:analysis*; D011991:Receptors, Virus / Q000032:analysis*; D012703:Serotyping; D014709:Vero Cells
chemical_list: D017474:Receptors, Laminin; D011991:Receptors, Virus; C111476:dengue virus receptor