title: Expression, release, and characterization of soluble human T-lymphotropic virus-I (HTLV-I) antigens from an infected cell line.
abstract: The Human T-lymphotropic virus type I (HTLV-I) infected cell line MT-2 was studied to obtain HTLV-I or related proteins for the purpose of producing an effective vaccine for HTLV-I infection. The cells were characterized as to HTLV-I antigen expression during the cell cycle and antigens released into the culture fluids. MT-2 cell grown in fetal calf supplemented media produced more HTLV-I related antigens during the G2/M phase of the cell cycle. To determine the conditions for maximal release and harvest of HTLV-I associated proteins, the MT-2 cells were grown in RPMI 1640 medium supplemented with serum-free medium. Cell- and virus-free supernatants were collected on day 4, lyophilized, and concentrated 50-fold. The proteins in these supernatants were characterized using SDS-PAGE and western blot using rabbit anti-HTLV-I sera and human adult T-cell leukemia sera. The western-blot analysis indicated that the supernatants obtained from the MT-2 cells grown in serum-free supplemented medium contained detectable amounts of proteins which reacted with human ATL and rabbit anti-HTLV-I sera. The molecular weights of these proteins observed are 68kd, 46kd, 28kd, 24kd, 19kd, and 15kd indicating that gag, env, and pX gene products are present.
authors.affiliation: Department of Veterinary Pathobiology, College of Veterinary Medicine, Ohio State University, Columbus 43210.
authors.forename: R G
authors.initials: RG
authors.lastname: Olsen
authors.forename: M G
authors.initials: MG
authors.lastname: Lewis
authors.forename: R M
authors.initials: RM
authors.lastname: Bauer
authors.forename: M J
authors.initials: MJ
authors.lastname: Tarr
authors.forename: L E
authors.initials: LE
authors.lastname: Mathes
authors.forename: L J
authors.initials: LJ
authors.lastname: Lafrado
authors.forename: J R
authors.initials: JR
authors.lastname: Blakeslee
mesh_terms: D015153:Blotting, Western; D002453:Cell Cycle; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D005434:Flow Cytometry; D015486:HTLV-I Antigens / Q000032:analysis*; D015490:HTLV-I Infections / Q000276:immunology*; D006801:Humans; D012995:Solubility
chemical_list: D015486:HTLV-I Antigens