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ABC Transporters: Exporter01:31

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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Flavonoid derivatives as selective ABCC1 modulators: Synthesis and functional characterization.

José Esteban Obreque-Balboa1, Qiu Sun2, Günther Bernhardt1

  • 1Institute of Pharmacy, University of Regensburg, D-93040 Regensburg, Germany.

European Journal of Medicinal Chemistry
|January 17, 2016
PubMed
Summary

Researchers developed novel chromone compounds that effectively modulate the ABCC1 transporter, showing high selectivity and stability. These compounds offer potential as pharmacological tools for studying ABCC1

Keywords:
ABC transporterABCC1ChromoneMRP1Multidrug resistanceReversan

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Area of Science:

  • Medicinal Chemistry
  • Molecular Pharmacology
  • Biochemistry

Background:

  • ATP-binding cassette (ABC) transporters, including ABCC1, ABCB1, and ABCG2, play crucial roles in cellular transport and drug resistance.
  • Modulation of ABC transporters is a key strategy in cancer therapy and understanding drug disposition.
  • Flavonoid-type compounds are explored for their diverse biological activities, including transporter modulation.

Purpose of the Study:

  • To synthesize and characterize novel chromone derivatives with potential activity against ABC transporters.
  • To evaluate the potency and selectivity of synthesized compounds, particularly for ABCC1 (multidrug resistance-associated protein 1).
  • To assess the utility of promising compounds as pharmacological tools for ABCC1 research.

Main Methods:

  • Synthesis of a series of chromone compounds with substituted amino or carboxamide groups.
  • In vitro cellular assays using cell lines overexpressing specific ABC transporters (MDCKII-MRP1 for ABCC1, Kb-V1 for ABCB1, MCF-7/Topo for ABCG2).
  • Determination of IC50 values for transporter inhibition and assessment of resistance reversal to cytostatics.

Main Results:

  • Several synthesized chromones demonstrated potent modulation of ABCC1.
  • Compound 51, a specific chromone derivative, showed high potency against ABCC1 (IC50 11.3 μM) with excellent selectivity, being inactive against ABCB1 and ABCG2.
  • Compound 51 effectively reversed ABCC1-mediated drug resistance and exhibited stability in mouse plasma and cell culture.

Conclusions:

  • Novel chromone derivatives, particularly compound 51, are potent and selective modulators of the ABCC1 transporter.
  • Compound 51's efficacy and stability make it a valuable pharmacological tool for investigating the physiological and pathological roles of ABCC1.
  • These findings contribute to the development of targeted therapies and research tools for ABC transporter-related diseases.