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• W1961190372 abstract "The interplay between feline leukemia virus (FeLV) and feline lymphocytes (lc) infected in vitro or in vivo was investigated. Surface marker analysis and viral infectivity (VI) assays of lc populations were used to determine susceptibility of lc subsets to FeLV. The principal FeLV-replicating cell in the mesenteric lymph node of persistently infected, preleukemic cats was a nonadherent, complement receptor (CR)-bearing lc (B-cell). The lymph nodes of preleukemic cats also had increased numbers of uninfected T-cells [cells forming rosettes with guinea pig erythrocytes (GPE)] and cells with receptors for the Fc portion of 7S IgG (Fc gamma R cells) as compared with lymph nodes of age-matched specific-pathogen-free (SPF) cats. The induction of productive infection of feline peripheral blood mononuclear leukocytes (PBL) in vitro depended on a 48-hour in vitro preincubation period before virus exposure. The equivalent susceptibility of whole and adherent cell-depleted PBL to productive infection and the failure of hydrocortisone to enhance viral infection were compatible with identification of the FeLV-replicating cell as an lc. Furthermore, lc from susceptible SPF kittens replicated 50 times as much FeLV as did lc from resistant adult SPF cats. The Ic productively infected with FeLV after in vitro exposure were more precisely identified with the use of Ficoll-Isopaque density gradient separations of rosetted and nonrosetted lc. Whole PBL, GPE rosette-positive PBL (T-cells), and CR-positive PBL (B-cells) were permissive to FeLV infection, and maximal VI was evident at 14 days after exposure. The substantial (1,325-fold) increment in VI found in the Fc gamma R-depleted PBL suggested a role for Fc gamma R cells in the containment of FeLV infection. Unstimulated mononuclear leukocytes from blood, spleen, lymph node, thymus, and marrow were susceptible to productive FeLV infection after in vitro exposure. The degree of spontaneous DNA synthesis in marrow, thymus, and spleen but not lymph node or PBL was inversely related to permissiveness to viral replication. Mitogen activation of lc was associated with decreased viral replication when either T-cell mitogens (concanavalin A, phytohemagglutinin, or pokeweed mitogen) or a B-cell mitogen (dextran sulfate) was used. Virus production by spleen cells and PBL was enhanced twofold to tenfold by prior lc stimulation by the B-cell mitogen, lipopolysaccharide, or protein A-bearing Staphylococcus aureus, a mitogen for feline T-cells with Fc gamma R. Both productively infected (preincubated) and nonproductively infected (freshly isolated) PBL transferred infectious FeLV to autochthonous peritoneal macrophages (M theta); most of the virus in PBL-peritoneal M theta cocultures was produced by adherent cells, irrespective of whether the adherent or nonadherent cell population was inoculated originally." @default.
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• W1961190372 date "1981-10-01" @default.
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• W1961190372 title "Determinants of Susceptibility and Resistance to Feline Leukemia Virus Infection. II. Susceptibility of Feline Lymphocytes to Productive Feline Leukemia Virus Infection<xref ref-type=fn rid=FN2>2</xref><xref ref-type=fn rid=FN3>3</xref>" @default.
• W1961190372 doi "https://doi.org/10.1093/jnci/67.4.899" @default.
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• W1961190372 hasPublicationYear "1981" @default.
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