A novel co-operative mechanism linking TGF beta and Lyn kinase activation to imatinib resistance in chronic myeloid leukaemia cells

作者：Smith Paul G; Tanaka Hideo; Chantry Andrew^*

来源：Oncotarget, 2012, 3(5): 518-524.

• Transforming growth factor-beta
• Smads
• ubiquitin
• c-cbl
• Lyn
• leukaemia

The advent of a mechanism specific inhibitor imatinib, targeting Bcr-Abl kinase, has paved the way for new treatment strategies in chronic myeloid leukaemia (CML). However, resistance to imatinib is common in patients and has recently been linked to both transforming growth factor-beta (TGF beta) and elevated Lyn kinase activity, although molecular mechanisms remain largely unknown. Here, using leukaemic MYL cell lines derived from CML patients, we show that TGF beta plays a key role in imatinib-resistance via direct effects on Lyn ubiquitination and turnover that results in bursts of Lyn kinase activity, and identify c-cbl is a candidate E3 ubiquitin ligase. Furthermore, blockade of TGF beta signalling activity with the TGF beta receptor kinase inhibitor SB431542 significantly reduces Lyn turnover and activation, and subsequently enhances imatinib-mediated CML cell death in a proteasomal-dependent manner. Collectively, our data reveals novel co-operative mechanisms in CML involving TGF beta and Lyn kinase linked to proteasome function and ubiquitination, and thus supports therapeutic approaches that target TGF beta pathway activity as a strategy for overcoming imatinib-resistance in CML.

• 出版日期2012-5