Isosilybin B,一种从 silymarin 中分离的黄酮木脂素,具有抗前列腺癌 (PCA) 活性,抑制癌细胞增殖,诱导 G1 期阻滞和凋亡。Isosilybin B 引起雄激素受体降解。
Isosilybin B Chemical Structure
CAS No. : 142796-22-3
规格
价格
是否有货
数量
1 mg
¥2000
In-stock
5 mg
¥3500
询价
10 mg
询价
50 mg
询价
* Please select Quantity before adding items.
生物活性
Isosilybin B, a flavonolignan isolated from silymarin, has anti-prostate cancer (PCA) activity via inhibiting proliferation and inducing G1 phase arrest and apoptosis. Isosilybin B causes androgen receptor (AR) degradation[1][2].
分子量
482.44
Formula
C25H22O10
CAS 号
142796-22-3
中文名称
异水飞蓟宾B
运输条件
Room temperature in continental US; may vary elsewhere.
储存方式
Powder
-20°C
3 years
4°C
2 years
In solvent
-80°C
6 months
-20°C
1 month
参考文献
[1]. Deep G, et al. Isosilybin B and isosilybin A inhibit growth, induce G1 arrest and cause apoptosis in human prostatecancer LNCaP and 22Rv1 cells. Carcinogenesis. 2007 Jul;28(7):1533-42.
[2]. Deep G, et al. Isosilybin B causes androgen receptor degradation in human prostate carcinoma cells via PI3K-Akt-Mdm2-mediated pathway. Oncogene. 2008 Jun 26;27(28):3986-98.
Isosilybin (Isosilybinin) is a flavonoid from milk thistle; inhibits CYP3A4 induction with an IC50 of 74 μM.
IC50 & Target
IC50: 74 μM (CYP3A4)[1]
体外研究 (In Vitro)
The reporter gene assay shows that milk thistle’s components silybin and isosilybin are responsible for the inhibition of PXR-mediated CYP3A4 induction by milk thistle. Compared with silybin, its isomer isosilybin is a stronger inhibitor of PXR-mediated CYP3A4 induction. A solution of 89, 133, and 200 μM isosilybin significantly inhibits CYP3A4 induction by 64, 82, and 88%, respectively. Isosilybin inhibits CYP3A4 induction with an IC50 of 74 μM[1]. Isosilybin B and isosilybin A, two diastereoisomers isolated from silymarin, have anti-prostate cancer (PCA) activity that is mediated via cell cycle arrest and apoptosis induction. Isosilybin B and isosilybin A treatment results in growth inhibition and cell death together with a strong G(1) arrest and apoptosis in human prostate cancer LNCaP and 22Rv1 cells[2]. Isosilybin B causes increased phosphorylation of Akt (Ser-473 and Thr-308) and Mdm2 (Ser-166), which is linked with androgen receptor degradation as pretreatment with PI3K inhibitor (LY294002)-restored androgen receptor level. Isosilybin B treatment enhances the formation of complex between Akt, Mdm2 and AR, which promotes phosphorylation-dependent AR ubiquitination and its degradation by proteasome[3]. Isosilybin A is able to significantly activate PPARγ at a concentration of 30 μM (2.08±0.48 fold, p<0.01). Isosilybin A causes transactivation of a PPARγ-dependent luciferase reporter in a concentration-dependent manner. In silico docking studies suggests a binding mode for 3 distinct from that of the inactive silymarin constituents, with one additional hydrogen bond to Ser342 in the entrance region of the ligand-binding domain of the receptor[4].
上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.
分子量
482.44
Formula
C25H22O10
CAS 号
72581-71-6
中文名称
异水飞蓟宾
运输条件
Room temperature in continental US; may vary elsewhere.
[1]. Mooiman KD, et al. Milk thistle’s active components silybin and isosilybin: novel inhibitors of PXR-mediated CYP3A4 induction. Drug Metab Dispos. 2013 Aug;41(8):1494-504.
[2]. Deep G, et al. Isosilybin B and isosilybin A inhibit growth, induce G1 arrest and cause apoptosis in human prostate cancer LNCaP and 22Rv1 cells. Carcinogenesis. 2007 Jul;28(7):1533-42.
[3]. Deep G, et al. Isosilybin B causes androgen receptor degradation in human prostate carcinoma cells via PI3K-Akt-Mdm2-mediated pathway. Oncogene. 2008 Jun 26;27(28):3986-98.
[4]. Pferschy-Wenzig EM, et al. Identification of isosilybin a from milk thistle seeds as an agonist of peroxisome proliferator-activated receptor gamma. J Nat Prod. 2014 Apr 25;77(4):842-7.
Cell Assay [2]
LNCaP cells and 22Rv1 cells are plated and treated at 40–50% confluency with different doses of isosilybin B and isosilybin A (10–90 μM in medium) dissolved originally in Dimethyl sulfoxide (DMSO) for the desired time periods (24–48 h) in serum condition. An equal amount of DMSO (vehicle) is present in each treatment, including control; DMSO concentration did not exceed 0.1% (v/v) in any treatment. At the end of desired treatments, total cell number is determined by counting each sample in duplicate using a hemocytometer under an inverted microscope. Cell viability is determined using trypan blue exclusion method[2].
上海金畔生物科技有限公司 has not independently confirmed the accuracy of these methods. They are for reference only.
参考文献
[1]. Mooiman KD, et al. Milk thistle’s active components silybin and isosilybin: novel inhibitors of PXR-mediated CYP3A4 induction. Drug Metab Dispos. 2013 Aug;41(8):1494-504.
[2]. Deep G, et al. Isosilybin B and isosilybin A inhibit growth, induce G1 arrest and cause apoptosis in human prostate cancer LNCaP and 22Rv1 cells. Carcinogenesis. 2007 Jul;28(7):1533-42.
[3]. Deep G, et al. Isosilybin B causes androgen receptor degradation in human prostate carcinoma cells via PI3K-Akt-Mdm2-mediated pathway. Oncogene. 2008 Jun 26;27(28):3986-98.
[4]. Pferschy-Wenzig EM, et al. Identification of isosilybin a from milk thistle seeds as an agonist of peroxisome proliferator-activated receptor gamma. J Nat Prod. 2014 Apr 25;77(4):842-7.
Isosilybin A 是一种从 silymarin 中分离出来的黄酮木脂素,具有抗前列腺癌 (PCA) 活性。Isosilybin A 抑制癌细胞增殖并诱导 G1 期停滞和凋亡,通过靶向 Akt-NF-κB-androgen receptor (AR) 轴激活前列腺癌细胞的凋亡机制。
Isosilybin A Chemical Structure
CAS No. : 142796-21-2
规格
价格
是否有货
数量
10 mM * 1 mL in DMSO
¥3715
询价
1 mg
¥2000
In-stock
5 mg
¥3500
询价
10 mg
询价
50 mg
询价
* Please select Quantity before adding items.
生物活性
Isosilybin A, a flavonolignan isolated from silymarin, has anti-prostate cancer (PCA) activity. Isosilybin A inhibits proliferation and induces G1 phase arrest and apoptosis in cancer cells, which activates apoptotic machinery in PCA cells via targeting Akt-NF-κB-androgen receptor (AR) axis[1][2].
分子量
482.44
Formula
C25H22O10
CAS 号
142796-21-2
中文名称
异水飞蓟宾A
运输条件
Room temperature in continental US; may vary elsewhere.
[1]. Deep G, et al. Isosilybin B and isosilybin A inhibit growth, induce G1 arrest and cause apoptosis in human prostatecancer LNCaP and 22Rv1 cells. Carcinogenesis. 2007 Jul;28(7):1533-42.
[2]. Deep G, et al. Isosilybin A induces apoptosis in human prostate cancer cells via targeting Akt, NF-κB, and androgen receptor signaling. Mol Carcinog. 2010 Oct;49(10):902-12.