Anti-HIV type 1 Polyclonal antibody[Biotin]

HIV-1 cell entry is mediated by binding to the CD4-receptor and chemokine co-receptors CCR5 (R5) or CXCR4 (X4). R5-tropic viruses are predominantly detected during early infection. A switch to X4-tropism often occurs during the course of infection. X4-tropism switching is strongly associated with accelerated disease progression and jeopardizes CCR5-based HIV-1 cure strategies. It is unclear whether host immunological factors play a causative role in tropism switching. We investigated the relationship between immunological factors and X4-tropism in a cross-sectional study in HIV-1 subtype C (HIV-1C)-infected patients and in a longitudinal HIV-1 subtype B (HIV-1B) seroconverter cohort. Principal component analysis identified a cluster of immunological markers (%HLA-DR+ CD4(+) T-cells, %CD38(+)HLA-DR+-CD4(+) T-cells, %CD38(+)HLA-DR+-CD8(+) T-cells, %CD70(+)-CD4(+) T-cells, %CD169(+) monocytes, and absolute-CD4(+) T-cell count) in HIV-1C patients that was independently associated with X4-tropism (aOR 1.044, 95% CI 1.003-1.087, p = 0.0392). Analysis of individual cluster contributors revealed strong correlations of two markers of T-cell activation (%HLA-DR+-CD4(+) T-cells, %HLA-DR(+)CD38(+)-CD4(+) T-cells) with X4-tropism, both in HIV-1C patients (p = 0.01;p = 0.03) and HIV-1B patients (p = 0.0003;p = 0.0001). Follow-up data from HIV-1B patients subsequently revealed that T-cell activation precedes and independently predicts X4-tropism switching (aHR 1.186, 95% CI 1.065-1.321, p = 0.002), providing novel insights into HIV-1 pathogenesis and CCR5-based curative strategies.

Objectives Raltegravir (RAL) that can form chelates with multivalent metal cations shows lateral interactions with multivalent metal cation and polycationic polymer. We investigated the interactions of RAL with multivalent metal cation preparations, Al(OH)(3)and LaCO3, and polycationic polymer preparations, bixalomer (Bxl) and sevelamer (Svl). Methods Immediately before the oral administration of 40 mg/kg RAL, the rats were administered orally with the vehicle, Al(OH)(3), LaCO3, Bxl, or Svl, and the time course of RAL serum concentration was followed. Thein vitrobinding affinity of RAL with multivalent metal cation and polycationic polymer was also evaluated using isothermal titration calorimetry (ITC). Results When Al(OH)(3), LaCO3, Bxl, or Svl was concomitantly administered with RAL, the maximum concentration and area under the curve were significantly lower than those when RAL was administered alone. ITC showed the interaction of RAL with Al(OH)(3)as an enthalpy-driven reaction and its interactions with LaCO(3)and Bxl as entropy-enthalpy mixed reactions. Conclusions The interaction of RAL with Al(OH)(3), LaCO(3,)Bxl, or Svl can inhibit RAL absorption into the gastrointestinal tract, and thus, the multivalent metal cation and polycationic polymer are the modifying factors that can affect RAL pharmacokinetics.