Journal: Frontiers in Immunology
Article Title: Interaction Between Macrophage Migration Inhibitory Factor and CD74 in Human Immunodeficiency Virus Type I Infected Primary Monocyte-Derived Macrophages Triggers the Production of Proinflammatory Mediators and Enhances Infection of Unactivated CD4+ T Cells
Figure Lengend Snippet: Identification of cytokines as responsible for enhancing human immunodeficiency virus type I (HIV-1) infection in unactivated CD4 + T-cells. (A) Unactivated CD4 + T-cells were stimulated with different combinations of cytokines for 72 h. Then, cells were infected and p24 antigen production was evaluated at days 4 and 7 post-infection. Each condition was compared with the corresponding RPMI condition (negative control). As a positive control, PHA stimulation was used. Percentage of living CD4 + T-cells (B) and percentage of infected (GFP + ) CD4 + T-cells (C) after stimulation with the denoted treatments are shown. Data represent mean ± SD from four independent donors evaluated in duplicate. Concentrations of cytokines used in these experiments corresponded to the average concentrations found in monocyte-derived macrophage (MDM) supernatants stimulated with 25 ng/ml macrophage migration inhibitory factor (MIF) (peak effect) as follows: 250 pg/ml IL-6, 9,000 pg/ml IL-8, 1,400 pg/ml TNF-α, and 20 pg/ml IL-1β. (D) Neutralization of IL-8, IL-6, IL-1 β, and TNFα biological activity with monoclonal neutralizing antibodies. Primary CD4 + T-cells were incubated with supernatants derived from the 25 ng/ml MIF-treated HIV-infected MDM neutralized previously with 18 µg/ml anti-IL-8, 20 ng/ml anti-IL-6, 2 µg/ml anti-IL-1β, and 2 µg/ml anti-TNFα antibodies. Non-neutralized and isotype control antibody conditions were tested for comparison. Also, RPMI and PHA controls were included. Viral production was evaluated at day 4 post-infection. Data were analyzed by one-way ANOVA followed by Dunnett’s post-test (all conditions versus the corresponding RMPI control) in (A) and Tukey’s post-test in (D) . * p
Article Snippet: A CD74 blocking antibody (BD Pharmingen, clone LN2), the recombinant human cytokines IL-6, IL-8, IL-1β (BioLegend), and TNFα (MiltenyiBiotec), and the cytokine neutralizing antibodies anti-IL-8 (R & D Systems), anti-IL-6, anti-IL-1β, and anti-TNFα (BioLegend) were obtained.
Techniques: Infection, Negative Control, Positive Control, Derivative Assay, Migration, Neutralization, Activity Assay, Incubation