Abstract
Apoptosis repressor with caspase recruitment domain is expressed at high levels in brain and myogenic tissues, consistent with a role to inhibit apoptosis in the terminally differentiated cells. Expression of ARC in cancers is not known. In this study, we reported that ARC was highly expressed in various non-myogenic and non-neurogenic human and rat cancer cell lines. Unexpectedly, ARC was localized almost exclusively to the nuclei of cancer cells, which was unlike the cytoplasmic localization of ARC in non-cancer cells. Furthermore, nuclear ARC in cancer cells did not co-localize with nucleolus protein of 30kDa, an alternatively spliced ARC isoform. These findings indicate that ARC is distributed differently in cancer cells than non-cancer cells and thus might play a role in neoplastic transformation.
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