Bcl2 family proteins play an important role in the resistance of thyroid cancer cells to apoptosis induced by chemotherapeutic drugs and targeted therapies. BH3-profiling of seven fresh primary papillary thyroid cancer (PTC) tumors showed dependence for survival on Bcl-xL (2/7), Bcl2 (2/7), and Mcl-1 (2/7), while the majority of thyroid cell lines were mainly dependent on Bcl-xL. Targeting Bcl2 family proteins with the BH3 mimetic, ABT-737, while simultaneously inhibiting ERK pathway proteins with PLX4720 and PD32590 was shown to induce significantly high apoptosis in the majority of cell lines (8505c, SW1736, HTh7, BCPAP) and moderate apoptosis in the TPC-1 cell line.
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