Jatrophane Diterpenoids as Modulators of P-Glycoprotein-Dependent Multidrug Resistance (MDR): Advances of Structure–Activity Relationships and Discovery of Promising MDR Reversal Agents

AbstractP-gp-associated multidrug resistance is a major impediment to the success of chemotherapy. With the aim of finding non-toxic and effective P-gp inhibitors, we investigated a panel of quinolin-2-one-pyrimidine hybrids. Among the active compounds, two of them significantly increased intracellular doxorubicin and rhodamine 123 accumulation by inhibiting the efflux mediated by P-gp and restored doxorubicin toxicity at nanomolar range. Structure–activity relationships showed that the number of methoxy groups, an optimal length of the molecule in its extended conformation, and at least one flexible methylene group bridging the quinolinone to the moiety bearing the pyrimidine favored the inhibitory potency of P-gp. The best compounds showed a similar binding pattern and interactions to those of doxorubicin and tariquidar, as revealed by MD and hybrid QM/MM simulations performed with the recent experimental structure of P-gp co-crystallized with paclitaxel. Analysis of the molecular interactions stabilizing the different molecular complexes determined by MD and QTAIM showed that binding to key residues from TMH 4–7 and 12 is required for inhibition.

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Biological Evaluation, Structure−Activity Relationships, and Three-Dimensional Quantitative Structure−Activity Relationship Studies of Dihydro-β-agarofuran Sesquiterpenes as Modulators of P-Glycoprotein-Dependent Multidrug Resistance

Journal of Medicinal Chemistry ◽

10.1021/jm070290v ◽

2007 ◽

Vol 50 (20) ◽

pp. 4808-4817 ◽

Cited By ~ 30

Author(s):

Carolina P. Reyes ◽

Francisco Muñoz-Martínez ◽

Ivan R. Torrecillas ◽

Cristina R. Mendoza ◽

Francisco Gamarro ◽

...

Keyword(s):

Multidrug Resistance ◽

Three Dimensional ◽

Quantitative Structure Activity Relationship ◽

Structure Activity Relationship ◽

Biological Evaluation ◽

Activity Relationship ◽

Quantitative Structure ◽

Structure Activity Relationships ◽

Structure Activity ◽

P Glycoprotein

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Quinolin-2-one-pyrimidine Hybrids Acting as Potent Reversal Agents on the P-gp-mediated Multidrug Resistance: Insights into Structure-activity Relationships and the Binding Mode

10.21203/rs.3.rs-451061/v1 ◽

2021 ◽

Author(s):

Jerónimo Laiolo ◽

Priscila Ailin Lanza ◽

Oscar Parravicini ◽

Cecilia Barbieri ◽

Daniel Insuasty ◽

...

Keyword(s):

Multidrug Resistance ◽

Molecular Complexes ◽

Binding Mode ◽

Reversal Agents ◽

Structure Activity Relationships ◽

Structure Activity ◽

Doxorubicin Toxicity ◽

Key Residues ◽

Nanomolar Range ◽

Experimental Structure

Abstract P-gp-associated multidrug resistance (MDR) is a major impediment to the success of chemotherapy. With the aim of finding non-toxic and effective P-gp inhibitors, we investigated a panel of quinolin-2-one-pyrimidine hybrids. Among the active compounds, two of them significantly increased intracellular doxorubicin and rhodamine 123 accumulation by inhibiting the efflux mediated by P-gp and restored doxorubicin toxicity at nanomolar range. Structure-activity relationships showed that the number of methoxy groups, an optimal length of the molecule in its extended conformation, and at least one flexible methylene group bridging the quinolinone moiety favored the inhibitory potency of P-gp. The best compounds showed a similar binding pattern and interactions to those of doxorubicin and tariquidar, as revealed by MD and hybrid QM/MM simulations performed with the recent experimental structure of P-gp co-crystallized with paclitaxel. Analysis of the molecular interactions stabilizing the different molecular complexes determined by MD and QTAIM showed that binding to key residues from TMH 4–7 and 12 is required for inhibition.

Download Full-text