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BioAssay: AID 695876

Cytotoxicity against drug-resistant human KBV1 cells expressing P-gp incubated for 72 hrs by MTT assay

A major challenge in the treatment of cancer is multidrug resistance (MDR) that develops during chemotherapy. Here we demonstrate that tiopronin (1), a thiol-substituted N-propanoylglycine derivative, was selectively toxic to a series of cell lines expressing the drug efflux pump P-glycoprotein (P-gp, ABCB1) and MRP1 (ABCC1). Treatment of MDR cells with 1 led to instability of the ABCB1 mRNA and more ..
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 Tested Compounds
 Tested Compounds
All(25)
 
 
Active(1)
 
 
Inactive(1)
 
 
Unspecified(23)
 
 
 Tested Substances
 Tested Substances
All(25)
 
 
Active(1)
 
 
Inactive(1)
 
 
Unspecified(23)
 
 
 Related BioAssays
 Related BioAssays
AID: 695876
Data Source: ChEMBL (856620)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2013-06-29
Modify Date: 2014-08-23

Data Table ( Complete ):           View Active Data    View All Data
BioActive Compound: 1
Description:
Title: Collateral sensitivity of multidrug-resistant cells to the orphan drug tiopronin.

Abstract: A major challenge in the treatment of cancer is multidrug resistance (MDR) that develops during chemotherapy. Here we demonstrate that tiopronin (1), a thiol-substituted N-propanoylglycine derivative, was selectively toxic to a series of cell lines expressing the drug efflux pump P-glycoprotein (P-gp, ABCB1) and MRP1 (ABCC1). Treatment of MDR cells with 1 led to instability of the ABCB1 mRNA and consequently a reduction in P-gp protein, despite functional assays demonstrating that tiopronin does not interact with P-gp. Long-term exposure of P-gp-expressing cells to 1 sensitized them to doxorubicin and paclitaxel, both P-gp substrates. Treatment of MRP1-overexpressing cells with tiopronin led to a significant reduction in MRP1 protein. Synthesis and screening of analogues of tiopronin demonstrated that the thiol functional group was essential for collateral sensitivity while substitution of the amino acid backbone altered but did not destroy specificity, pointing to future development of targeted analogues.
(PMID: 21657271)
Comment
Compounds with activity <= 50uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.
Putative Target:
ChEMBL Target ID: 22226
Target Type: UNCHECKED
Pref Name: Unchecked
Confidence: Default value - Target unknown or has yet to be assigned
Relationship Type: Default value - Target has yet to be curated
Categorized Comment - additional comments and annotations
From BioAssay Depositor:
Assay Type: Functional
Assay Data Source: Scientific Literature
BAO: Assay Format: cell-based format
Result Definitions
TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1IC50*IC50 PubChem standard valueFloatμM
2IC50 activity commentIC50 activity commentString
3IC50 standard flagIC50 standard flagInteger
4IC50 qualifierIC50 qualifierString
5IC50 published valueIC50 published valueFloatmM
6IC50 standard valueIC50 standard valueFloatnM
7IC50 data validityIC50 data validityString

* Activity Concentration.

Data Table (Concise)
Data Table ( Complete ):     View Active Data    View All Data
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