Effects of Quercetin on Chronic Myeloid Leukemia Cell Line Resistant to Imatinib and Its Mechanism / 中国实验血液学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To explore the growth inhibitory effect of quercetin on imatinib-resistant chronic myeloid leukemia cell lines and to clarify its involved mechanisms.</p><p><b>METHODS</b>The cell viability was detected by trypan blue Staining, percentage of apoptotic cells and cell cycle distribution were detected by flow cytometry, the protein expression was detected by Western blot.</p><p><b>RESULTS</b>Both inhibitory effect of proliferation and apoptosis-inducing effect were similar between the imatinib-resistant and -sensitive cell lines treated with 25 µmol/L quercetin for 24 hours and with arrest of cell cycle at G/M phase. Quercetin could not change the expression of BCR-ABL. The expression of γ-H2AX was markedly enhanced and the phosphorylation of JNK up-regulated by quercetin in both imatinib-resistant and imatinib-sensitive cell lines.</p><p><b>CONCLUSION</b>The growth of imatinib-resistant cells can be inhibited by quercetin, and the apoptosis of cells can be induced by quercetin, which may be related to cell cycle arrest in G/M. The DNA damage and up-regulation of p-JNK may be involved in these processes.</p>