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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Synergistic antiproliferative effect of human interferons in combination with mismatched double-stranded RNA on human tumor cells.

Four human tumor cell lines were studied for their response to antiproliferative effects of various interferons (IFNs) alone and in combination with the novel mismatched dsRNA, r(I)n r(C12,U)n (Ampligen). RT4 cells (bladder carcinoma) were resistant to Ampligen alone, while A2182 (lung carcinoma), HT 1080 C14 (fibrosarcoma) and RT112 (bladder carcinoma) cells were inhibited in a dose-dependent manner. In contrast, RT4 cells were sensitive to the antitumor effects of IFNs as were HT1080 C14 and RT112 cells, while A2182 cells were resistant. In 3 of 4 cell lines, the recombinant IFNs were less effective than the corresponding natural IFNs when compared by analysis of variance on an IRU/ml basis over a range of concentrations. In all cell lines, a synergistic antiproliferative effect was seen with all IFN preparations studied in combination with Ampligen, as calculated by the isobole method according to Berenbaum (1981). The antiproliferative effect of IFN was potentiated greater than 3.3- to greater than 250-fold, depending on the cell lines, IFN, and concentrations used. Varying the concentration of beta ser-IFN while holding the Ampligen concentration constant gave synergy at all of the physiologically achievable concentrations tested in RT4 cells. These results indicate that: Ampligen worked synergistically with all IFNs in all cell lines studied; growth inhibition of cells resistant to IFNs can be potentiated by low doses of Ampligen; the antiproliferative effect of IFNs can be potentiated by Ampligen in Ampligen-resistant cells; and Ampligen may work by a mechanism other than, or in addition to, the induction of IFNs.[1]


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