For long term storage, we suggest that betulin be stored as supplied at -20°C. It ...
A stock solution may be made by dissolving the betulin in the solvent of choice.
Product Information Betulin
Item No. 11041 CAS Registry No.: 473-98-3 Formal Name: lup-20(29)-ene-3β,28-diol Synonyms: NSC 4644, Trochol MF: C30H50O2 FW: 442.7 Purity: ≥98% Stability: ≥2 years at -20°C Supplied as: A crystalline solid
CH2 H3C H H CH3
Laboratory Procedures For long term storage, we suggest that betulin be stored as supplied at -20°C. It should be stable for at least two years. Betulin is supplied as a crystalline solid. A stock solution may be made by dissolving the betulin in the solvent of choice. Betulin is soluble in dimethyl formamide (DMF), which should be purged with an inert gas. The solubility of betulin in DMF is approximately 2.5 mg/ml. Betulin is sparingly soluble in aqueous solutions. To enhance aqueous solubility, dilute the organic solvent solution into aqueous buffers or isotonic saline. If performing biological experiments, ensure the residual amount of organic solvent is insignificant, since organic solvents may have physiological effects at low concentrations. We do not recommend storing the aqueous solution for more than one day. Sterol regulatory element binding protein 2 (SREBP-2) regulates cholesterol synthesis by activating the transcription of genes for HMG-CoA reductase and other enzymes of the cholesterol synthetic pathway.1,2 When cellular sterol levels are high, SREBP is bound by SCAP and Insig to ER membranes as a glycosylated precursor protein. Upon cholesterol depletion, the protein is cleaved to its active form and translocated into the nucleus to stimulate transcription of genes involved in the uptake and synthesis of cholesterol.3 Betulin, the precursor of betulinic acid, is a pentacyclic triterpene found in the bark of birch trees. Betulin inhibits the SREBP-driven pathway of cholesterol and fatty acid biosynthesis by promoting SCAP–Insig binding which prevents the activation and release of SREBP-2 from the ER.4 At 15-30 mg/kg/day, betulin has been shown to decrease lipid levels and increase insulin sensitivity in mice fed a westerntype diet.4 In an atherosclerosis disease model, 30 mg/kg/day betulin can reduce the size and improve the stability of atherosclerotic plaques in LDLR-knockout mice.4 At 2.5-5 μg/ml betulin, in combination with cholesterol, demonstrates anticancer effects by inducing apoptosis in Jurkat cells, A549 lung carcinoma cells, and HeLa cervical carcinoma cells.5 References 1. Sakai, J., Nohturfft, A., Goldstein, J.L., et al. Cleavage of sterol regulatory element-binding proteins (SREBPs) at site-1 requires interaction with SREBP cleavage-activating protein. Evidence from in vivo competition studies. J. Biol. Chem. 273(10), 5785-5793 (1998). 2. Brown, M.S. and Goldstein, J.L. The SREBP pathway: Regulation of cholesterol metabolism by proteolysis of a membrane-bound transcription factor. Cell 89, 331-340 (1997). 3. Smith, L.H., Petrie, M.S., Morrow, J.D., et al. The sterol response element binding protein regulates cyclooxygenase-2 gene expression in endothelial cells. J. Lipid Res. 46, 862-871 (2005). 4. Tang, J.-J., Li, J.-G., Qi, W., et al. Inhibition of SREBP by a small molecule, betulin, improves hyperlipidemia and insulin resistance and reduces atherosclerotic plaques. Cell Metab. 13(1), 44-56 (2011). 5. Mullauer, F.B., Kessler, J.H., and Medema, J.P. Betulin is a potent anti-tumor agent that is enhanced by cholesterol. PLoS One 4(4), (2009). Related Products For a list of related products please visit: www.caymanchem.com/catalog/11041
WARNING: This product is for laboratory research only: not for administration to humans. Not for human or veterinary diagnostic or therapeutic use.
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MATERIAL SAFETY DATA This material should be considered hazardous until information to the contrary becomes available. Do not ingest, swallow, or inhale. Do not get in eyes, on skin, or on clothing. Wash thoroughly after handling. This information contains some, but not all, of the information required for the safe and proper use of this material. Before use, the user must review the complete Material Safety Data Sheet, which has been sent via email to your institution.
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