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- W2021076523 abstract "The present study has investigated whether nerve fiber transection alters the phosphorylation of serine at position 133 (Ser133) of the transcription factor CREB (phosphoCREB). Activation of CREB by phosphorylation has a major function in the control of gene transcription. PhosphoCREB was visualized by antisera that specificly react with an epitope comprising the phosphorylated Ser133 of CREB as well as of CREM and ATF1 proteins. In untreated rats, nuclear immunoreactivity (IR) of phosphoCREB was consistently visible, e.g. in the cortex, thalamic and hypothalamic compartments and central termination areas of primary somatosensory afferents. Transection of peripheral (sciatic nerve), cranial (hypoglossal and facial nerve) and central (medial forebrain bundle and mammillo-thalamic tract) nerve fibers did not increase phosphoCREB-IR in the axotomized neurons between 5 min and 30 days post-axotomy. In contrast, phosphoCREB-IR appeared after 24 h in glial cells adjacent to the axotomized motoneurons and persisted up to 4 weeks. This increase in glial phosphoCREB-IR was paralleled by enhanced expression of the CREB protein itself. Between 20 min and 24 h following sciatic nerve transection, the number of phosphoCREB labeled nuclei also increased in neurons of the ipsilateral superficial dorsal horn of lumbar L3–L5 spinal cord segments. These data suggest that phosphorylation of Ser133 in CREB/CREM/ATF1 proteins is not involved in the transcriptional control of early-response genes such as c-jun in axotomized neurons, following nerve transection. This is in contrast to the reported phosphorylation of CREB and its trans-acting effects on immediate-early genes such as c-fos after transynaptic neuronal excitation." @default.
- W2021076523 created "2016-06-24" @default.
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- W2021076523 date "1994-10-01" @default.
- W2021076523 modified "2023-09-26" @default.
- W2021076523 title "The transcription factor CREB is not phosphorylated at serine 133 in axotomized neurons: implications for the expression of AP-1 proteins" @default.
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- W2021076523 doi "https://doi.org/10.1016/0169-328x(94)90098-1" @default.
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