Interactions of quercetin with receptor tyrosine kinases associated with human lung carcinoma

Area of Science:

• Molecular biology
• Biochemistry
• Pharmacology

Background:

• Lung cancer presents significant morbidity and mortality.
• Deregulated receptor tyrosine kinases (RTKs) are critical drivers in lung carcinoma.
• Quercetin, a dietary flavonoid, exhibits anti-cancer properties, including growth inhibition and apoptosis induction in lung cancer cells.

Purpose of the Study:

• To investigate the inhibitory potential of quercetin against four major overexpressed RTKs in human lung cancer: EGFR, FGFR1, IGF1R, and c-Met.
• To determine the binding interactions and orientation of quercetin within the ATP binding pocket of these target kinases.

Main Methods:

• Molecular docking simulations were utilized to predict the binding mode and affinity of quercetin to the selected RTKs.
• Analysis of hydrogen, hydrophobic, and π-π interactions within the kinase active site, focusing on the hinge region and DFG motif.

Main Results:

• Quercetin demonstrated favorable binding scores and interactions within the ATP binding pocket of EGFR, FGFR1, IGF1R, and c-Met.
• Key interactions, including hydrogen bonds and hydrophobic contacts, were observed with critical residues in the kinase active site.
• The binding orientation suggests quercetin can effectively occupy the ATP-binding site, potentially inhibiting kinase activity.

Conclusions:

• Quercetin shows promise as an inhibitor of multiple overexpressed RTKs implicated in lung cancer.
• These findings support the further exploration of quercetin as a scaffold for developing novel targeted therapies or polypharmacological agents for lung cancer treatment.