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Updated: Apr 27, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
Published on: August 2, 2018
HIF-1α-independent hypoxia-induced rapid PTK6 stabilization is associated with increased motility and invasion
Isabel M Pires1, Nina Jg Blokland2, Agnieke Wt Broos2
1CR-UK/MRC Oxford Institute for Radiation Oncology; Department of Oncology; University of Oxford; Oxford, UK; School of Biological, Biomedical and Environmental Sciences; University of Hull; Hull, UK.
Abstract:
PTK6/Brk is a non-receptor tyrosine kinase overexpressed in cancer. Here we demonstrate that cytosolic PTK6 is rapidly and robustly induced in response to hypoxic conditions in a HIF-1-independent manner. Furthermore, a proportion of hypoxic PTK6 subsequently re-localized to the cell membrane. We observed that the rapid stabilization of PTK6 is associated with a decrease in PTK6 ubiquitylation and we have identified c-Cbl as a putative PTK6 E3 ligase in normoxia. The consequences of hypoxia-induced PTK6 stabilization and subcellular re-localization to the plasma membrane include increased cell motility and invasion, suggesting PTK6 targeting as a therapeutic approach to reduce hypoxia-regulated metastatic potential. This could have particular significance for breast cancer patients with triple negative disease.
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