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Title: New therapeutic strategy for overcoming multidrug resistance in cancer cells with pyrazolo[3,4‐d]pyrimidine tyrosine kinase inhibitors
Authors: Podolski‐renić, Ana
Dinić, Jelena
Stanković, Tijana
Tsakovska, Ivanka
Pajeva, Ilza
Tuccinardi, Tiziano
botta, lorenzo 
Schenone, Silvia
Pešić, Milica
Journal: CANCERS 
Issue Date: 2021
Tyrosine kinase inhibitors (TKIs) often interact with the multidrug resistant (MDR) phenotype of cancer cells. In some cases, TKIs increase the susceptibility of MDR cancer cells to chemotherapy. As the overexpression of membrane transporter P‐glycoprotein (P‐gp) is the most com-mon alteration in MDR cancer cells, we investigated the effects of TKI pyrazolo[3,4‐d]pyrimidines on P‐gp inhibition in two cellular models comprising sensitive and corresponding MDR cancer cells (human non‐small cell lung carcinoma and colorectal adenocarcinoma). Tested TKIs showed collateral sensitivity by inducing stronger inhibition of MDR cancer cell line viability. Moreover, TKIs directly interacted with P‐gp and inhibited its ATPase activity. Their potential P‐gp binding site was proposed by molecular docking simulations. TKIs reversed resistance to doxorubicin and paclitaxel in a concentration‐dependent manner. The expression studies excluded the indirect effect of TKIs on P‐gp through regulation of its expression. A kinetics study showed that TKIs decreased P‐gp activity and this effect was sustained for seven days in both MDR models. Therefore, pyrazolo[3,4‐d]pyrimidines with potential for reversing P‐gp‐mediated MDR even in prolonged treatments can be considered a new therapeutic strategy for overcoming cancer MDR.
ISSN: 2072-6694
DOI: 10.3390/cancers13215308
Rights: CC0 1.0 Universal
Appears in Collections:A1. Articolo in rivista

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