Characterization of a 5'-flanking region supporting the transcription of mouse thymosin beta-4 in mouse NIH3T3 cells.
Su. Y Y; Chang. S L SL; Hsiao. H L HL
Key Findings
- A DNA fragment from -278 to +410 relative to the mouse Tbeta‑4 gene start site can drive gene expression in NIH3T3 cells.
- Interferon‑alpha treatment does not increase expression of a reporter linked to this fragment, even though it quickly raises the natural Tbeta‑4 gene in the cells.
- The predicted interferon‑stimulated response element (ISRE) is likely located outside the examined promoter region.
Practical Outcomes
- For biohackers, this work doesn’t provide any direct guidance on dosing, supplementation, or lifestyle tricks to boost thymosin beta‑4 levels. It mainly adds basic knowledge about how the gene is regulated in mice, indicating that simple interferon‑alpha exposure won’t reliably increase the peptide via this promoter region.
Summary
This study looked at the DNA region that controls how the mouse makes thymosin beta‑4, a protein that binds actin inside cells. The researchers found a specific DNA segment that can turn on a reporter gene in mouse fibroblast cells, but adding interferon‑alpha didn’t boost that activity, suggesting the interferon‑responsive element is elsewhere.
Abstract
Expression of the gene coding for thymosin beta-4 (Tbeta-4), the major G-actin sequestering peptide in the cell, is regulated mainly at the level of transcription. In this study, we examined the nucleotide sequence of the 5'-flanking region (from -2202 to -881) of the mouse Tbeta-4 gene, and demonstrated that the DNA fragment from -278 to +410 of this gene was capable of directing the expression of a chloramphenicol acetyltransferase reporter gene in NIH3T3 cells. However, expression of the reporter gene in cells cannot be induced by interferon-alpha treatment even though a rapid activation of endogenous Tbeta-4 gene by this cytokine was observed. These results suggest that the projected interferon-stimulated response element (ISRE) might reside in other parts of the mouse Tbeta-4 gene.
Study Information
pubmed
2000
10.1023/a:1007020619788