Estradiol Up-regulates AUF1p45 Binding to Stabilizing Regions within the 3′-Untranslated Region of Estrogen Receptor α mRNA
| Autor: | Dana A. Massuto, Nancy H. Ing, Laurie A. Jaeger |
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| Rok vydání: | 2008 |
| Předmět: |
Gene isoform
RNA Stability Recombinant Fusion Proteins Estrogen receptor Biology Binding Competitive Models Biological Biochemistry Estrogen-related receptor alpha Gene expression Animals Humans Heterogeneous Nuclear Ribonucleoprotein D0 RNA Messenger Heterogeneous-Nuclear Ribonucleoprotein D Phosphorylation 3' Untranslated Regions Molecular Biology Estrogen receptor beta Sheep Estradiol Tissue Extracts Three prime untranslated region Uterus Estrogen Receptor alpha Cell Biology Molecular biology Up-Regulation Female Estrogen-related receptor gamma Estrogen receptor alpha hormones hormone substitutes and hormone antagonists HeLa Cells Protein Binding |
| Zdroj: | Journal of Biological Chemistry. 283:1764-1772 |
| ISSN: | 0021-9258 |
| Popis: | Estradiol up-regulates expression of the estrogen receptor alpha gene in the uterus by stabilizing estrogen receptor alpha mRNA. Previously, we defined two discrete minimal estradiol-modulated stability sequences (MEMSS) within the extensive 3'-untranslated region of estrogen receptor alpha mRNA with an in vitro stability assay using cytosolic extracts from sheep uterus. We report here that excess MEMSS RNA inhibited the enhanced stability of estrogen receptor alpha mRNA in extracts from estradiol-treated ewes compared with those from control ewes. Several estradiol-induced MEMSS-binding proteins were characterized by UV cross-linking in uterine extracts from ewes in a time course study (0, 8, 16, and 24 h after estradiol injection). The pattern of binding proteins changed at 16 h post-injection, concurrent with enhanced estrogen receptor alpha mRNA stability and the highest rate of accumulation of estrogen receptor alpha mRNA. The predominant MEMSS-binding protein induced by estradiol treatment was identified as AUF1 (A + U-rich RNA-binding factor 1) protein isoform p45 (a product of the heterogeneous nuclear ribonucleoprotein D gene). Immunoblot analysis indicated that only two of four AUF1 protein isoforms were present in the uterine cytosolic extracts and that estradiol treatment strongly increased the ratio of AUF1 isoforms p45 to p37. Nonphosphorylated recombinant AUF1p45 protected estrogen receptor alpha mRNA in vitro in a dose-dependent manner. These studies describe estrogenic induction of AUF1p45 binding to the estrogen receptor alpha mRNA as a molecular mechanism for post-transcriptional up-regulation of gene expression. |
| Databáze: | OpenAIRE |
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