Tariquidar
Catalog No.S8028 Synonyms: XR9576
Molecular Weight(MW): 646.73
Tariquidar is a potent and selective noncompetitive inhibitor of P-glycoprotein with Kd of 5.1 nM in CHrB30 cell line, reverses drug resistance in MDR cell Lines. Phase 3.
Purity & Quality Control
Choose Selective P-gp Inhibitors
Biological Activity
| Description | Tariquidar is a potent and selective noncompetitive inhibitor of P-glycoprotein with Kd of 5.1 nM in CHrB30 cell line, reverses drug resistance in MDR cell Lines. Phase 3. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| In vitro |
Tariquidar displays high-affinity binding to P-gp with Bmax of 275 pmol/mg. Tariquidar shows non-competitive interaction with the P-gp substrates vinblastine and paclitaxel. Tariquidar increases the steady-state accumulation of these cytotoxics in CHrB30 cells to levels observed in non-P-gp-expressing AuxB1 cells with EC50 of 487 nM. Tariquidar is able to inhibit the vanadate-sensitive ATPase activity of P-gp by 60-70%, with potent IC50 values of 43 nM. [1] Tariquidar may inhibit other resistance mechanisms at higher concentrations. 1 μM Tariquidar abrogates ABCG2 (BCRP)-mediated resistance to camptothecins in vitro. [2] Tariquidar potentiates the cyto-toxicity of several drugs including doxorubicin, paclitaxel, etoposide, and vincristine; complete reversal of resistance is achieved in the presence of 25- 80 nM Tariquidar. In MC26, a murine colon carcinoma cell line with intrinsic chemoresistance, the doxorubicin IC50 is fivefold lower in the presence of 0.1 μM Tariquidar (36 vs 7 nM). In murine mammary carcinoma, human small-cell lung carcinoma and human ovarian carcinoma cell lines with acquired chemotherapeutic resistance (EMT6/AR1.0, H69/LX4 and 2780 AD), the in vitro doxorubicin IC50 is 22-150-fold lower in the presence of 0.1 μM Tariquidar. P-gp inhibition persists for 23 h after removal of Tariquidar from the culture system. [3] Tariquidar restored the cyto-toxicity of doxorubicin and vinblastine in the National Cancer Institute (NCI)/ADRRES multicellular tumor spheroid model derived from the MCF7WT breast cancer cell line. [4] |
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| In vivo | Tariquidar (2- 8 mg/kg p.o.) is found to significantly potentiate the antitumor activity of doxorubicin (5 mg/kg, i.v.) against MC26 murine colon carcinoma in vivo. In human carcinoma xenografts, coadministration of XR9576 (6 -12 mg/kg p.o.) fully restored the antitumor activity of paclitaxel, etoposide, and vincristine against two highly resistant MDR human tumor xenografts (2780AD, H69/LX4) in nude mice. [3] |
Protocol
| Kinase Assay: |
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Steady-state drug accumulation assay: AuxB1 and CHrB30 cells are grown to confluency in 12-well (24 mm) tissue culture dishes and the steady-state accumulation of [3H]-vinblastine is measured. Accumulation is initiated by the addition of 0.1 μ Ci [3H]-vinblastine and unlabelled vinblastine to a final concentration of 100 nM . The accumulation of [3H]-paclitaxel is measured using 0.1 μ Ci [3H]-paclitaxel and unlabelled drug to a final concentration of 1 μM . Cells are incubated in a reaction volume of 1 mL for 60 min at 37 ℃ under 5% CO2 in order to reach steady-state. The effect of the modulators XR9576 on [3H]-ligand accumulation is investigated in the concentration range 10-9 - 10-6 M. Modulators are added from a DMSO stock giving a final solvent concentration of 0.2 % (v/v). Following cell harvesting, accumulated drug is measured by liquid scintillation counting and normalized for cell protein content. Plots of amount accumulated as a function of modulator concentration are fitted with the general dose-response equation: Y={(a-b)/(1+(X/c)d)}+bWhere: Y=response; a=initial response; b=final response; c=EC50 concentration; d=slope value; X=drug concentration. |
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Solubility (25°C)
| In vitro | DMSO | 52 mg/mL (80.4 mM) |
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| Water | Insoluble | |
| Ethanol | Insoluble | |
| In vivo | Add solvents to the product individually and in order(Data is from Selleck tests instead of citations): 30% Propylene glycol+5% Tween 80+65% D5W For best results, use promptly after mixing. |
30mg/mL |
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Information
| Molecular Weight | 646.73 |
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| Formula | C38H38N4O6 |
| CAS No. | 206873-63-4 |
| Storage | powder |
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| Synonyms | XR9576 |
Bio Calculators
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Clinical Trial Information
| NCT Number | Recruitment | interventions | Conditions | Sponsor/Collaborators | Start Date | Phases |
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| NCT01663545 | Completed | -- | Epilepsies Partial | National Institute of Neurological Disorders and Stroke (NINDS)|National Institutes of Health Clinical Center (CC) | July 31 2012 | -- |
| NCT01547754 | Terminated | -- | HIV-Associated Cognitive Motor Complex | National Institute of Mental Health (NIMH)|National Institutes of Health Clinical Center (CC) | January 9 2012 | -- |
| NCT01386476 | Completed | -- | Drug Resistance | National Institute of Mental Health (NIMH)|National Institutes of Health Clinical Center (CC) | June 15 2011 | -- |
| NCT00082368 | Completed | Drug: Tariquidar|Drug: Tc-94m Sestamibi | Cancer | National Cancer Institute (NCI)|National Institutes of Health Clinical Center (CC) | May 16 2004 | Phase 2 |
Tech Support
Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
Tel: +1-832-582-8158 Ext:3
If you have any other enquiries, please leave a message.
Frequently Asked Questions
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Question 1:
Can you please give me more specific and detailed information of how to dissolve and use this compound (S8028) for in vivo studies?
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Answer:
Tariquidar in 30% Propylene glycol, 5% Tween 80, 65% D5W at 30mg/ml will be a suspension or emulsion. If you are going to administrate the compound by oral gavage, it is fine. We also have test some vehicles for Tariquidar for i.p injection, and it is soluble in 5% DMSO+45% PEG 300+ddH2O at 2mg/ml clearly. When preparing the solution, please dissolve the compound in DMSO clearly first, then add PEG. After they mixed well, then dilute with water.
