title: [Antiproliferative activity of different preparations of human interferons].
abstract: The conclusion that the AP activity of IFN in the ChLI-1 preparation was not lost but masked by an admixture of obscure factors was drawn on the basis of coefficients of AV/AP ratio titres of IFN-alpha preparations of various degrees of purification prepared at the Gamaleia Institute of Epidemiology and Microbiology and the shape of curves of the AP effect. It was found that the curve of AP activity of diluted interferon may be of parabolic shape which reflected AP effect of high and low concentrations in the absence of AP effect for some intermediate dilutions. This is due to competitive relationships of the growth-stimulating factors and IFN upon non-simultaneous elimination of its individual subtypes. The existence of a curve of such shape indicates the expediency of testing lower concentrations than those which are characterized by a sigmoid shape of curves of AP activity, especially for cells with low sensitivity to interferon.
mesh_terms: D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007372:Interferons / Q000302:isolation & purification / Q000494:pharmacology*; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors
chemical_list: D011994:Recombinant Proteins; D007372:Interferons
vernacular_title: Antiproliferativnaia aktivnost' razlichnykh preparatov chelovecheskikh interferonov.