SIRT1

Caspase-3 is one of the most important players in apoptosis signaling. It is synthesized as an inactive 32 kDa pro-enzyme and upon direct activation by Caspase-8, -9 or -10, it gets processed into its active forms, the p17-20 and p10-12 subunits. The latter are responsible for the cleavage of PARP (poly ADP-ribose polymerase), actin and SREBP, which are associated with apoptosis [1].

DNA methyltransferases catalyze the transfer of the methyl group from S-andenosyl methionine (SAM) to DNA. Such methylation has wide ranging function in the cell, including organismal development and cell differentiation. In cancer, abnormal hypermethylation of gene promoter CpG islands can result in transcriptional silencing.