Abstract
S100 proteins belong to the EF-hand Ca2+-binding protein family and are involved in the regulation of a variety of cellular processes. Individual S100 proteins are expressed in cell- and tissue-specific manners, and functional deterioration of S100 proteins leads to a number of human diseases, including cancer. We previously demonstrated that S100C/A11 was translocated to nuclei and inhibited DNA synthesis in human keratinocytes when exposed to high Ca2+. In the present study we examined the effects of synthetic partial peptides of S100C/A11 on human carcinoma cell lines. Only an N-terminal peptide with 19 amino acid residues (MAK19) showed cytotoxicity to the cell lines in dose- and time-dependent manners when introduced into cells by flanking the HIV-TAT protein transduction domain (TAT-MAK19). Pulse field electrophoresis revealed that DNA of the treated cells was partially degradated. Annexin V, a marker of cellular apoptosis, was detected in the cells treated with TAT-MAK19 by immunostaining and flow cytometry. The induction of apoptotic cell death was apparently independent of p53, p21WAF1/CIP1, and caspase activity, but treatment with TAT-MAK19 resulted in partial translocation of apoptosis-inducing factor (AIF) from the ...Continue Reading
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