title: SU proteins from virulent and avirulent EIAV demonstrate distinct biological properties.
abstract: Biologic activity of equine infectious anemia virus (EIAV) surface (SU) glycoprotein was assayed in a mouse model. Recombinant SU from virulent EIAV17 (SU17), administered intraperitoneally to mouse pups, induced dose-dependent diarrheal responses similar to those reported for SIV SU (Virology 277 (2000) 250). SU17 caused fluid accumulation without histological lesions in mouse intestinal loops, induced chloride secretory currents in Ussing chambers and increased inositol 1,4,5 triphosphate (IP3) levels in HT29 cells. An SU17 peptide, SU17(299-330), provoked a dose-dependent diarrheal response akin to enterotoxic peptides from SIV. In contrast, SU from an avirulent EIAV strain failed to induce a dose response in mouse pups and produced lower levels of activity than SU17 in Ussing chambers and IP3 assays. These results demonstrate that a mouse pup model is useful to monitor EIAV SU biologic activity, showing clear differences between the activities of SU derived from virulent and avirulent viruses, and may provide a useful screen of EIAV virulence.
authors.affiliation: Department of Pathobiology, Texas A&M University, Texas Veterinary Medical Center, MS4467, College Station, TX 77843, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Ball
authors.forename: C L
authors.initials: CL
authors.lastname: Swaggerty
authors.forename: X
authors.initials: X
authors.lastname: Pei
authors.forename: W S
authors.initials: WS
authors.lastname: Lim
authors.forename: X
authors.initials: X
authors.lastname: Xu
authors.forename: V C
authors.initials: VC
authors.lastname: Cox
authors.forename: S L
authors.initials: SL
authors.lastname: Payne
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000831:Animals, Newborn; D003967:Diarrhea / Q000821:virology; D004195:Disease Models, Animal; D006023:Glycoproteins / Q000737:chemistry / Q000502:physiology*; D004860:Infectious Anemia Virus, Equine / Q000737:chemistry / Q000472:pathogenicity* / Q000502:physiology; D007422:Intestines / Q000503:physiopathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000502:physiology; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000502:physiology*; D014774:Virulence
chemical_list: D006023:Glycoproteins; D010446:Peptide Fragments; C091940:SU protein, equine infectious anemia virus; D014759:Viral Envelope Proteins