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• W2033624817 abstract "The interferon induced double-stranded-RNA-dependent eIF-2α kinase has an established role in mediating part of interferons anti-viral effects. Several studies have suggested that it may have additional functions in cells not infected with virus. The mechanism of activation of the kinase and the consequences of its activity in uninfected cells remain to be determined. Our previous results have indicated that the activation (phosphorylation) of this kinase may be an important regulatory signal to the arrest of growth of mouse 3T3-F442A fibroblasts and their subsequent differentiation to adipocytes. We have found that the phosphorylation of the kinase occurred in vivo in the absence of viral infection and in vitro without the addition of dsRNA. We demonstrate here that total cytoplasmic RNA from 3T3-F442A cells contains a regulatory RNA(s) capable of activating dsRNA-dependent eIF-2α kinase. Fractionation of the cytoplasmic RNA by oligo(dT)-cellulose indicated that the regulatory RNA eluted with the poly(A)-rich RNA fraction. It bound tightly to the dsRNA-dependent eIF-2α kinase and was immune-precipitated with its antibodies as a complex of regulatory RNA and dsRNA-dependent eIF-2α kinase. The regulatory RNA activity was further purified by phenol extraction of immune precipitates containing this complex. These findings indicated that the regulatory RNA forms a specific complex with the dsRNA-dependent eIF-2α kinase. The activity of the regulatory RNA was sensitive to the dsRNA-specific RNase VI but not to proteinase K, DNase I or ssRNA-specific RNase T1. The activation of the dsRNA-dependent eIF-2α kinase by regulatory RNA was prevented by addition of a high concentration of poly(I) · poly(C). The regulatory RNA was also shown to activate partially purified dsRNA-dependent eIF-2α kinase prepared from rabbit reticulocyte lysates and to inhibit protein synthesis in reticulocyte lysates. Our findings, that cellular RNAs can specifically activate the dsRNA-dependent eIF-2α kinase, are consistent with a physiological role for the dsRNA-dependent eIF-2α kinase and interferon during cell growth and differentiation. The relationship of the regulatory RNA activity to growth and differentiation of 3T3-F442A cells is discussed." @default.
• W2033624817 created "2016-06-24" @default.
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• W2033624817 date "1991-01-01" @default.
• W2033624817 modified "2023-10-17" @default.
• W2033624817 title "Activation of the double-stranded RNA-dependent eIF-2alpha kinase by cellular RNA from 3T3-F442A cells" @default.
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• W2033624817 doi "https://doi.org/10.1111/j.1432-1033.1991.tb15673.x" @default.
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