What is inducible Cre?
What is inducible Cre?
11. Inducible Cre can be leaky. Cre is sequestered in the cytoplasm when it is fused to the ligand binding domain of the estrogen receptor, and enters the nucleus when exposed to tamoxifen.
How does tamoxifen Cre work?
It utilizes a mutated estrogen receptor (ER) fused to Cre as a transgene (Cre-ER), which only becomes activated and then translocates into the nucleus upon binding of the active tamoxifen (TAM) metabolite 4-hydroxytamoxifen (4-OHT), which mutates the ER.
What is UBC Cre?
Common Name: UBC-Cre-ERT2. When these UBC-Cre-ERT2 mice are bred with mice containing a loxP-flanked sequence of interest, tamoxifen-inducible, Cre-mediated recombination will result in deletion of the floxed sequences in widespread cells/tissues. In Goodwin et al. 2019 Genome Res.
What is Cre activity?
Cre recombinase-mediated DNA recombination is an established method for conditional control of gene expression in animal models. Regulation of its activity has been accomplished to impart spatial and/or temporal control over recombination of the target gene.
What does tamoxifen do to mice?
25, 26 Our results show that tamoxifen-treated mice showed altered social interaction, locomotor activity and anxiety. In the learned helplessness model, it has been reported that learned helplessness can result in depression.
Why is tamoxifen used in mice?
Tamoxifen is widely used for the induction of genomic recombination in mice (double-)transgenic for floxed genes and Tamoxifen specific estrogen receptors (ER) coupled to Cre-recombinase (supplemental Table 1) (Hayashi and McMahon 2002).
What Cre means?
CRE stands for carbapenem-resistant Enterobacterales. Enterobacterales are an order of bacteria commonly found in people’s gastrointestinal tract that can cause infections both in healthcare and community settings.
How long does tamoxifen stay in a mouse?
The complete degradation of tamoxifen and its metabolites, after the dose of 2 × 200 mg/kg, occurred within 8 days in young adult C57BL/6J mice with an exception for N-desmethyltamoxifen, which did not reach undetectable brain concentration within 8 days.
How do you inject tamoxifen in mice?
Before injecting, warm Tamoxifen at 65C for 10min. Use a 27-gauge needle and inject the mouse with 9mg/40gr body weight, 3x times, one every other day (you can do up to 5 injections continuously) Determine recombination one week after the last TM injection….Tamoxifen Injection.
| Weight (gr) | Volume TM (ul) |
|---|---|
| 19 | 214 |
| 20 | 225 |
| 21 | 236.5 |
| 22 | 247.5 |
Does tamoxifen make you gain weight?
Some even call it the “backbone” of breast cancer treatment. Even with all that fanfare, tamoxifen has been loosely associated with weight gain. Studies have tracked weight gain and other side effects of the drug for years. Some resources even list weight gain as a possible side effect.
What is Cre used for?
Cre recombinase is a widely used tool in the field of molecular biology. The enzyme’s unique and specific recombination system is exploited to manipulate genes and chromosomes in a huge range of research, such as gene knock out or knock in studies.
Does tamoxifen induce Cre activity in endothelium?
Specificity and efficiency of Cre activity was documented by crossing VECad-Cre-ERT2 with the ROSA26R reporter mouse, in which a floxed-stop cassette has been placed upstream of the beta-galactosidase gene. We found that tamoxifen specifically induced widespread recombination in the endothelium of embryonic, neonatal, and adult tissues.
Does tamoxifen induce recombination in adipose tissue?
Tamoxifen treatment induced almost complete recombination in white adipose tissue of the AdipoqCreER(T)² mouse line (97%-99%), while no recombination was seen in vehicle-treated animals. Recombination in brown adipose tissue was about 15%, whereas other organs and tissues did not undergo recombination.
Is tamoxifen treatment in older mice more prone to gender-related confounding?
Finally, baseline ERα expression increases in female but decreases in male kidneys upon ageing, indicating that studies involving Tamoxifen treatment in older mice might be even more prone to gender-related confounding than observed in the present study in young mice (Sharma and Thakur 2004). Conclusion
Is tamoxifen an estrogen agonist or antagonist?
Introduction Tamoxifen is widely used for the induction of genomic recombination in mice (double-)transgenic for floxed genes and Tamoxifen specific estrogen receptors (ER) coupled to Cre-recombinase (supplemental Table 1) (Hayashi and McMahon 2002). Tamoxifen is both an antagonist and agonist of ER signaling, depending on tissue type.
