Abstract
The α-subunit of C-phycocyanin (CpcA) was expressed in Escherichia coli and purified. The recombinant CpcA inhibited the growth of human colon carcinoma COLO 205 cells. Typical apoptotic morphological characteristics, such as chromatin condensation and nuclear fragmentation, were observed in CpcA-treated COLO 205 cells by fluorescence microscopy and transmission electron microscopy. Moreover, the apoptotic process was associated with the Bax/Bcl-2 ratio up-regulation, mitochondrial membrane depolarization, cytochrome c release, and caspase-9 activation. These findings indicate that CpcA induced the death of COLO 205 cells through the intrinsic apoptotic pathway.
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