Product name: Bufalin
Synonym name:
Catalogue No.: BP0288
Cas No.: 465-21-4
Formula: C₂₄H₃₄O₄
Mol Weight: 386.532
Botanical Source: Bufonis Venenum
Physical Description:
Type of Compound: Steroids

Purity: 95%~99%
Analysis Method: HPLC-DAD or/and HPLC-ELSD
Identification Method: Mass, NMR
Packing: Brown vial or HDPE plastic bottle

Storage: Store in a well closed container, protected from air and light. Put into refrigerate or freeze for long term storage.
Whenever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20℃. Generally, these will be useable for up to two weeks.

The product could be supplied from milligrams to grams
Inquire for bulk scale.

Description:

Bufalin a major digoxin-like immunoreactive component of the Chinese medicine Chan Su; has been shown to exert a potential for anticancer activity against various human cancer cell lines in vitro. Bufalin is a potent small-molecule inhibitor of the steroid receptor coactivators steroid receptor coactivator (SRC)-3 and SRC-1, it also as a potentially broad-spectrum small-molecule inhibitor for cancer. Bufalin can partly reverse the MDR of K562/VCR cells, with a possible mechanism of down-regulating MRP1 expression and activating apoptosis pathway by altering Bcl-xL/Bax ratio.

References:

J Tradit Chin Med. 2014 Dec;34(6):678-83.    

Reversal effect of bufalin on multidrug resistance in K562/VCR vincristine-resistant leukemia cell line.  

To probe insights into the reversal effect of Bufalin on vincristine-acquired multidrug resistance (MDR) in human leukemia cell line K562/VCR. 

METHODS AND RESULTS:

Proliferative inhibition rate and the reversal index (RI) of Bufalin were determined by Methyl thiazolyl tetrazolium assay. The uptake of Adriamycin (ADM) in K562/VCR cells, cell cycle and apoptosis rate were determined by flow cytometry (FCM). Cell morphologic changes were observed with Wright-Giemsa staining. The expression of P-glycoprotein (P-gp), multidrug-associated protein-1 (MRP1), Bcl-xL and Bax protein were measured by immunocytochemistry. The human leukemia multidrug resistant K562/VCR cells showed no cross-resistance to Bufalin. The RIs of Bufalin at concentrations of 0.0002, 0.001 and 0.005 μmol/L were 4.85, 6.94 and 14.77, respectively. Preincubation of 0.001 μmol/L Bufalin for 2 h could increase intracellular ADM fluorescence intensity to 28.07% (P < 0.05) and down-regulate MRP1 expression simultaneously, but no remarkable effect was found on P-gp protein. Cell cycle analysis indicated increased apoptosis rate and apparent decreased G2/M phase proportion after treatment with Bufalin. When exposed to 0.01 μmol/L Bufalin, typical morphological changes of apoptosis could be observed. Down-regulation of Bcl-xL and up-regulation of Bax expression in K562/VCR cells could be detected by immunocytochemistry. 

CONCLUSIONS:

Bufalin could partly reverse the MDR of K562/VCR cells, with a possible mechanism of down-regulating MRP1 expression and activating apoptosis pathway by altering Bcl-xL/Bax ratio.    

J Biol Chem. 1996 Jun 14;271(24):14067-72.    

The cooperative interaction of two different signaling pathways in response to bufalin induces apoptosis in human leukemia U937 cells.  

Bufalin, an active principle of Chinese medicine, chan'su, induced typical apoptosis in human leukemia U937 cells.

METHODS AND RESULTS:

When U937 cells were treated with 10(-8) M Bufalin in the absence of serum, mitogen-activated protein (MAP) kinase activity was markedly increased 6 h after the start of treatment and elevated so for 12 h. Prior to the activation of MAP kinase, increased activities of Ras, Raf-1, and MAP kinase kinase were found, but these enzymes were transiently activated by the treatment with Bufalin. These results suggest that the signal was transmitted sequentially from Ras, Raf-1, and MAP kinase kinase to MAP kinase. In association with this signal transduction, the concentration of cAMP in the cells decreased markedly, suggesting that Raf-1 was also activated by a decrease in the extent of phosphorylation by protein kinase A. In fact, pretreatment of U937 cells with forskolin and 3-isobutyl-1-methylxanthine, which are known to increase the concentration of cAMP in the cells, and subsequent treatment with Bufalin resulted in a decrease in both Raf-1 activity and DNA fragmentation. To confirm the participation of MAP kinase in the apoptotic process, antisense cDNA for MAP kinase kinase 1 was expressed in U937 cells. The transformants were significantly resistant to both DNA fragmentation and cell death in response to Bufalin. 

CONCLUSIONS:

Our findings suggest that a pathway with the persistent activation of MAP kinase in U937 cells in response to Bufalin is at least one of the signal transduction pathways involved in the induction of apoptosis.    

HPLC of Bufalin

HNMR of Bufalin

Storage conditions：Short-term storage at 2~8℃, long-term storage at -20 ~ -80℃