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- W2000783314 abstract "Repeated lesions of rat cerebral cortex result in transient peaks in the level of the c-fos transcript, but after the second lesion, this peak is substantially diminished. Using this lesion paradigm, we have analyzed the participation of the c-fos promoter elements SRE and DSE in the regulation of c-fos transcription. Following a single lesion, SRE/DSE binding activity peaked at 2 h, subsequent to the maximal levels of c-fos mRNA and parallel to the peak of c-Fos protein. After a second lesion (reinduction), 4 h following the initial lesion, SRE/DSE binding activity peaked after only 30 min and was significantly higher than following the first lesion. Once again, this peak occurred after the peak of c-fos mRNA expression and parallel with the second peak of c-Fos protein expression. These results suggested that the SRE and DSE promoter elements participated in the induction and down-regulation of c-fos transcription in vivo and suggested the possible involvement of Fos protein in its own regulation. The ability of Fos/Fra proteins to participate in a transcriptional complex was confirmed in gel-shift experiments with an AP-1 element, and the biphasic trend of binding activity was observed. Supershift experiments were performed to directly determine whether Fos protein was participating in SRE and/or DSE transcriptional complexes. No alterations in the position or intensity of the shifted band were observed using Fos/Fra antiserum suggesting that Fos/Fra proteins could be involved in c-fos down-regulation through mechanisms other than direct participation in the SRE/DSE transcription complex." @default.
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- W2000783314 date "1997-12-01" @default.
- W2000783314 modified "2023-10-03" @default.
- W2000783314 title "Enhanced serum response element binding activity correlates with down-regulation of c-fos mRNA expression in the rat brain following repeated cortical lesions" @default.
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- W2000783314 doi "https://doi.org/10.1016/s0169-328x(97)00222-2" @default.
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