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Expression of the calcium binding protein calretinin in WiDr cells and its correlation to their cell cycle

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Abstract

Ca2+ ions intervene during different phases of the progression of the cell cycle, but only one calcium-binding protein, calmodulin, has been shown to be associated with dividing cells. We therefore screened cancer cells for the presence of other related calcium-binding proteins. Using molecular biological and immunohistochemical techniques we show that human tumor cells of epithelial origin, express calretinin. Calretinin immunoreactivity can be demonstrated at precise moments of the cell cycle and, in particular, in phase G1 and during mitosis. During mitosis calretinin is localized both in the cytoplasm and in the mitotic spindle. In the cytoplasm we find calretinin after prophase and until telophase. In the spindle apparatus, calretinin is already present in cells in prometaphase and persists in all the succeeding mitotic phases. It is associated with the kinetochore microtubules but, in contrast to calmodulin, also with the polar microtubules. The role that calretinin plays in well-defined moments of the cell cycle of these cells is as yet unknown, but our results strongly suggest that, in collaboration with other molecules, calretinin intervenes in the dynamic phenomena regulating the separation of the chromosomes.

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