Cells treated with inhibitors were lysed with Trizol reagent (Invitrogen Life Technologies, Carlsbad, CA) for total RNA isolation. Subsequently, RNA extract was treated with TURBO DNA-free™ Kit (Ambion, Carlsbad, USA) in order to get rid of DNA contamination. The treated samples were thereafter subjected to cDNA synthesis using random hexamers (Amersham) at 65°C for 10 min and then at 37°C for 1 h. Quantitative RT-PCR was performed for gene specific transcript using primers specific for mouse were: caspase-8-Fwd, 5′-GAGGATGCCCAGAAGCTA-3′; caspase-8-Rev, 5′-CCG CAGCTCTCTCACCAT-3; caspase-3-Fwd, 5′-AATGTCATCTCGCTC TTGGT-3′; caspase-3-Rev, 5′-GCTTAGAATCACAC ACAC-3′; BAX-Fwd, 5′-CACCAGCTCTGAACAGAT-3′; BAX-Rev, 5′-CCAGTTCATCTCCAATTCG-3′. The reactions were carried out in an ABI Prism 7500 sequence detection system (Applied Biosystems, CA, USA). The qRT-PCR results were analyzed using the iCycler Thermal Cycler Software (Applied Biosystems, CA, USA) and normalized with those from 18S rRNA internal control (Das et al., 2009 (link)).
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