Abstract
ZAK is a mixed lineage kinase involved in cell differentiation, proliferation, and hypertrophic growth. ZAKα isoform of ZAK is associated with tumorigenesis, but the function of ZAKβ is not yet known. In H9c2 cells, ZAKβ was found to ameliorate the apoptotic effect induced by ZAKα. However, in osteosarcoma cells, ZAKβ elevates the apoptotic effect induced by ZAKα. In this study, we show that similar to ZAKα, the ZAKβ induces apoptosis and decreases cell viability. Interestingly, the expression of ZAKβ is dependent on ZAKα expression, and ZAKβ further enhances ZAKα expression and results in synergistic enhancement of apoptosis in osteosarcoma cells.
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