Harlan 他莫昔芬饮食Tamoxifen diets
Harlan Teklad动物饲料
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Tamoxifen diets
Diets with tamoxifen activate CreER
Several references cite use of tamoxifen-containing diets for models with Cre under the control of a mutated estrogen receptor. Envigo Teklad diets makes a variety of tamoxifen-containing diets customized to meet your research needs. We also make a variety of doxycycline-containing diets for tet regulated systems. If you have any questions, don’t hesitate to consult a nutritionist.
Teklad stocks tamoxifen and tamoxifen citrate
Tamoxifen is added to the diet as a tamoxifen-sucrose mixture. Users are encouraged to use the stocked supply. However, Teklad will continue to work with customer prepared mixes. If you choose this option, please consult a nutritionist for additional information about preparing and sending the mixture.
含他莫昔芬的饮食可激活 CreER
一些参考文献引用了在突变雌激素受体控制下的 Cre 模型使用含他莫昔芬的饮食。 Envigo Teklad 饮食可定制各种含他莫昔芬的饮食,以满足您的研究需求。 我们还为 tet 调节系统制作各种含有强力霉素的饮食。 如果您有任何疑问,请随时咨询营养师。
Teklad 库存他莫昔芬和他莫昔芬柠檬酸盐
他莫昔芬作为他莫昔芬-蔗糖混合物添加到饮食中。 鼓励用户使用库存供应。 但是,Teklad 将继续使用客户准备的混合物。 如果您选择此选项,请咨询营养师以获取有关准备和发送混合物的更多信息。
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上海金畔生物科技有限公司
Teklad offers diet with USP grade tamoxifen and tamoxifen citrate
Tamoxifen mg per kg diet |
Daily tamoxifen mg per kg body weight1 |
Diet code (Teklad supplied tamoxifen) | Diet code (Teklad supplied tamoxifen) |
---|---|---|---|
Natural colored | Red | ||
250 | 40 | TD.130855 | TD.130856 |
500 | 80 | TD.130857 | TD.130858 |
400 citrate2 | 40 | TD.130859 | TD.130860 3 |
1 Assumes 20-25 g body weight and three-four g intake
2 Tamoxifen citrate is 66% tamoxifen
3 Referred to as TAM400/CreER in Europe (TD.55125 )
1 假设体重为 20-25 克,摄入量为 3-4 克
2 柠檬酸他莫昔芬是 66% 的他莫昔芬
3 在欧洲称为 TAM400/CreER (TD.55125 )
Please add 5-10 day lead time for irradiated diets; minimum 3 kg orders are required for stocked and customized items.
These diets all have tamoxifen premixed with ~five percent sucrose as a palatability enhancer; however, feed aversion may still occur. If intake is a problem, see below for advice.
Teklad Global 2016 — base diet in these examples — is only one of several minimal phytoestrogen diets Teklad produces. Consult a nutritionist about use of other base diets.
请为辐照饮食增加 5-10 天的交货时间; 库存和定制商品至少需要 3 公斤订单。
这些饮食都含有预先混合了约 5% 蔗糖的他莫昔芬作为适口性增强剂; 但是,仍然可能会出现饲料厌恶。 如果摄入量有问题,请参阅下面的建议。
Teklad Global 2016(这些示例中的基础饮食)只是 Teklad 生产的几种最低植物雌激素饮食之一。 咨询营养师关于其他基础饮食的使用。
Key planning information
- Minimum order quantity is three kg, sufficient for feeding ~20 mice for one month
- Store diet refrigerated and plan to use within six months
- Typical lead time is two weeks (four weeks if irradiated)
- Irradiation (optional) minimal dose of 20 kGy (Must be requested at time of order)
主要规划信息
最小起订量为 3 公斤,足够喂食约 20 只老鼠一个月
将饮食冷藏并计划在六个月内使用
典型的交货时间是两周(如果受到辐照,则为四个星期)
辐照(可选)最小剂量 20 kGy(必须在订购时提出要求)
Mice need time to adjust
Plan for:
- Initial reduction in food intake and weight loss
- Daily observation of animal tolerance — consult your IACUC for monitoring metrics
- Intervene when necessary
Other researchers have the following advice
If intake seems to be a problem:
- Determine if a lower dose is effective for your model by conducting a tamoxifen dose feeding trial
- Gradually acclimate mice by mixing tamoxifen-containing pellets with regular feed pellets
- Wet the food, then place in a dish inside the cage (requires daily replacement)
- Feed tamoxifen diet on weekdays, regular diet on weekends
- Alternate weeks (two weeks on tamoxifen diet, one week off) for longer treatments
Safe handling of tamoxifen diets
- Tamoxifen is a selective estrogen receptor modulator (SERM) meaning it can repress actions of estrogen or have pro-estrogen effects
- Usual dose for therapeutic effects in humans is 20 mg/day. Tamoxifen diets for rodents typically contain ~one to two mg/pellet
- Accidental tamoxifen exposure can be minimized by using typical lab precautions of lab coat, gloves, and mask when handling the diet.
- Your chemical safety department should be contacted for additional institution specific guidelines for handling and disposal of tamoxifen containing diets.
Key points from literature
- Length of treatment varies from one to two weeks1,2,5,6,7,8 to one to two months3,4,8
- Pure tamoxifen1,5,8 and tamoxifen citrate1,2,3,4,6,7 are both effective
Usual tamoxifen doses are ~40-80 mg per kg body weight per day - Typical inclusion for pure tamoxifen is 250 mg8 or 500 mg1,5 and for tamoxifen citrate is 400 mg per kg diet1,2,3,4,6,7
- Initial weight loss of ten % is reported1,2,4,7,8, associated with reduced food intake2
- Subsequent recovery of body weight after returning to regular diet may be compromised by gene inactivation2,7
老鼠需要时间来调整
计划:
最初减少食物摄入和减轻体重
每日观察动物耐受性——咨询您的 IACUC 以了解监测指标
必要时进行干预
其他研究人员有以下建议
如果摄入量似乎有问题:
通过进行他莫昔芬剂量喂养试验确定较低剂量是否对您的模型有效
通过将含有他莫昔芬的颗粒与常规饲料颗粒混合来逐渐适应小鼠
弄湿食物,然后放在笼子里的盘子里(需要每天更换)
平日喂他莫昔芬饮食,周末规律饮食
隔周(他莫昔芬饮食两周,休息一周)进行更长时间的治疗
安全处理他莫昔芬饮食
他莫昔芬是一种选择性雌激素受体调节剂 (SERM),这意味着它可以抑制雌激素的作用或具有促雌激素作用
人类治疗效果的常用剂量为 20 毫克/天。啮齿动物的他莫昔芬饮食通常含有约 1 至 2 毫克/粒
通过在处理饮食时使用实验室外套、手套和面罩等典型的实验室预防措施,可以最大限度地减少意外的他莫昔芬暴露。
应联系您的化学安全部门,以获取有关处理和处置含他莫昔芬饮食的其他机构特定指南。
文献要点
治疗时间从一到两周不等1,2,5,6,7,8 到一到两个月3,4,8
纯他莫昔芬1,5,8和他莫昔芬柠檬酸盐1,2,3,4,6,7均有效
通常的他莫昔芬剂量为每天每公斤体重约 40-80 毫克
纯他莫昔芬的典型含量为 250 mg8 或 500 mg1,5,柠檬酸他莫昔芬的含量为 400 mg/kg 饮食 1,2,3,4,6,7
据报道,最初体重减轻 10%1,2,4,7,8,这与食物摄入量减少有关 2
恢复正常饮食后体重的后续恢复可能会受到基因失活的影响2,7
Selected tamoxifen references 参考文献
1 Andersson KB, Winer LH, Mork HK, Molkentin JD, Jaisser F. 2010. Tamoxifen administration routes and dosage for inducible Cre-mediated gene disruption in mouse hearts. Transgenic Res 19:715-725.
2 Chiang PM, Ling J, Jeong YH, Price DL, Aja SM, Wong PC. 2010. Deletion of TDP-43 down-regulates Tbc1d1, a gene linked to obesity, and alters body fat metabolism. Proc Natl Acad Sci USA 107:16320-16324.
3 Kardakaris R, Gareus R, Xanthoulea S, Pasparakis M. 2011. Endothelial and macrophage-specific deficiency of P38alpha MAPK does not affect the pathogenesis of atherosclerosis in ApoE-/- mice. PLoS One 6:e21055.
4 Kiermayer C, Conrad M, Schneider M, Schmidt J, Brielmeier M. 2007. Optimization of spatiotemporal gene inactivation in mouse heart by oral application of tamoxifen citrate. Genesis 45:11-16.
5 Koitabashi N, Bedja D, Zaiman AL, Pinto YM, Zhang M, Gabrielson KL, Takimoto E, Kass DA. 2009. Avoidance of transient cardiomyopathy in cardiomyocyte-targeted tamoxifen-induced MerCreMer gene deletion models. Circ Res 105:12-15.
6 Kratsios P, Catela C, Salimova E, Huth M, Berno V, Rosenthal N, Mourkioti F. 2009. Distinct roles for cell-autonomous Notch signaling in cardiomyocytes of the embryonic and adult heart. PCirc Res 106:559-572.
7 Miro-Murillo M, Elorza A, Soro-Arnaiz I, Albacete-Albacete L, Ordonez A, Balsa E, Vara-Vega A, Vazquez S, Fuertes E, Fernandez-Criado C, Landazuri MO, Aragones J. 2011. Acute Vhl gene inactivation induces cardiac HIF-dependent erythropoietin gene expression. PLoS One 6:e22589.
8 Welle S, Burgess K, Thornton CA, Tawil R. 2009. Relation between extent of myostatin depletion and muscle growth in mature mice. Am J Physiol Endocrinol Metab.Oct;297(4):E935-40.
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