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- W2078695040 abstract "To investigate the molecular mechanism of mammary carcinogenesis and identify novel molecular targets for breast cancer therapy, we analyzed genome-wide gene expression profiles of 81 clinical breast cancer samples. Here, we report the critical role of LGN/GPSM2 (Leu-Gly-Asn repeat-enriched protein/G-protein signaling modulator 2) in the growth of breast cancer cells. Semiquantitative RT-PCR and Northern blot analyses confirmed upregulation of LGN/GPSM2 in a large proportion of breast cancers. Immunocytochemical staining identified LGN/GPSM2 at the spindle in cells at metaphase, and at midzone and midbody in cytokinetic cells. Western blot analysis indicated the highest expression and the phosphorylated form of LGN/GPSM2 protein in G2/M phase. Treatment with small-interfering RNAs (siRNAs) targeting LGN/GPSM2 caused incompletion of cell division and resulted in significant growth suppression of breast cancer cells. We found that the 450th threonine (Thr450) of LGN/GPSM2 was phosphorylated by the serine/threonine kinase PBK/TOPK during mitosis. Overexpression of LGN/GPSM2-T450A in which Thr450 was substituted with alanine induced growth suppression and aberrant chromosomal segregation. These findings imply an important role of LGN/GPSM2 in cell division of breast cancer cells and suggest that the PBK/TOPK-LGN/GPSM2 pathway might be a promising molecular target for treatment of breast cancer." @default.
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- W2078695040 date "2010-06-29" @default.
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- W2078695040 title "Critical roles of LGN/GPSM2 phosphorylation by PBK/TOPK in cell division of breast cancer cells" @default.
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- W2078695040 doi "https://doi.org/10.1002/gcc.20795" @default.
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