名稱 | RITA |
描述 | RITA (NSC-652287)(NSC-652287) induced cross-links of both DNA-DNA and DNA-protein with no detectable DNA single-strand breaks. RITA, like nutlin-3, can disrupt the p53/Mdm2 interaction. |
細(xì)胞實驗 | Examination to assess susceptibility of cells to RITA (0.1 nM - 1 mM) is done using the XTT assay. Cells are inoculated into 96-well flat-bottom plates at a density of 1500 cells per well and incubated for 24 hours at 37 °C in a humidified 5% CO2 5% air atmosphere. Serial concentrations of RITA in DMSO are added to the wells, and sensitivity is determined 48 hours after the addition of RIT(Only for Reference) |
激酶實驗 | The inhibition profile of cabozantinib against a broad panel of 270 human kinases is determined using luciferase-coupled chemiluminescence,?33P-phosphoryl transfer, or AlphaScreen technology. Recombinant human full-length, glutathione?S-transferase tag, or histidine tag fusion proteins are used, and half maximal inhibitory concentration (IC50) values are determined by measuring phosphorylation of peptide substrate poly (Glu, Tyr) at ATP concentrations at or below the?Km?for each respective kinase. The mechanism of kinase inhibition is evaluated using the AlphaScreen Assay by determining the IC50?values over a range of ATP concentrations. |
體外活性 | RITA 以野生型p53依賴性方式抑制腫瘤生長.注射5次RITA(0.1 mg/kg)后可使HCT116腫瘤生長被抑制40%,而不影響HCT116 TP53-/- 腫瘤.注射5次 RITA(1 mg/kg)后使p53陽性移植瘤的生長率降低2倍,但不影響p53-null移植瘤.RITA(1或 10 mg/kg)具有較強(qiáng)的抗腫瘤活性.與對照組未處理小鼠相比, RITA(10 mg/kg)使HCT116 腫瘤減小了90%.RITA(10 mg/kg,i.p.)給藥小鼠處理1個月,結(jié)果顯示其耐受性良好,且未觀察到明顯的體重減輕. |
體內(nèi)活性 | RITA(10 nM)可使細(xì)胞周期停滯,使細(xì)胞在G2-M 期累積,100 nM時可促使DNA碎片和凋亡的出現(xiàn),并提高p53 蛋白水平。 作用于A498細(xì)胞時,RITA(30 nM)也誘導(dǎo) DNA-蛋白和DNA-DNA交聯(lián)產(chǎn)生。同時,RITA不影響top1-調(diào)節(jié)的超螺旋SV40 DNA松散。 RITA對HCT116 細(xì)胞生長有明顯抑制作用(97%),對HCT116 TP53-/- 細(xì)胞生長也有輕微抑制(13%)。與作用于缺乏 p53或 p53突變的細(xì)胞相比,RITA 作用于表達(dá)野生型 p53的細(xì)胞可更有效抑制生長。作用于腫瘤細(xì)胞時,由于細(xì)胞質(zhì) (S100)組分的累積,RITA 顯示出不同毒性的高度選擇性。RITA與全長p53結(jié)合,而不是谷胱甘肽S-轉(zhuǎn)移酶的蛋白或HDM-2。RITA也抑制包括 ACHN 和 UO-31在內(nèi)的其他腎臟細(xì)胞系生長(IC50:13 μM 和 37 μM)。RITA 阻斷p53與HDM-2相互作用和p53 泛素化。RITA使與p53共沉淀的HDM-2的量顯著降低,盡管這兩種蛋白是上調(diào)的。RITA阻斷 6XHis標(biāo)記的 His-HDM-2蛋白與純化GST-p53間的相互作用。通過促進(jìn)p53Ser46磷酸化,RITA可誘導(dǎo)凋亡。 RITA誘導(dǎo) p53激活,且出現(xiàn)磷酸化的MKK-4、ASK-1和 c-Jun的上調(diào)。其還誘導(dǎo)JNK信號激活。核磁共振的結(jié)果顯示,RITA不會阻斷MDM2的N-末端p53結(jié)合域(第 1-118位殘基)和p53 (第1-312位殘基)之間復(fù)合體的形成,這可能與RITA的結(jié)合需要p53的天然構(gòu)象有關(guān)。 |
存儲條件 | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | Shipping with blue ice. |
溶解度 | DMSO : 45 mg/mL (153.91 mM) Ethanol : 7.3 mg/mL (25 mM)
|
關(guān)鍵字 | MDM-2/p53 | inhibit | DNA Alkylator/Crosslinker | NSC-652287 | Autophagy | RITA | NSC652287 | Inhibitor |
相關(guān)產(chǎn)品 | Guanidine hydrochloride | Naringin | Valproic Acid | Taurine | Gefitinib | Aceglutamide | Hydroxychloroquine | Curcumin | Stavudine | Salicylic acid | Paeonol | Sodium 4-phenylbutyrate |
相關(guān)庫 | 抑制劑庫 | 細(xì)胞焦亡化合物庫 | 抗癌活性化合物庫 | 抗癌化合物庫 | 自噬庫 | 細(xì)胞凋亡化合物庫 | 抗衰老化合物庫 | 干細(xì)胞分化化合物庫 | 糖代謝化合物庫 | 酪氨酸激酶分子庫 |