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Stage-specific expression of Clast6/E3/LAPTM5 during B cell differentiation: elevated expression in human B lymphomas

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We have identified a CD40-regulated gene, Clast6/E3/LAPTM5, by subtraction of cDNAs derived from resting and CD40 ligand-treated B cells. Clast6/E3/LAPTM5 is abundantly expressed in resting mature B cells but is rapidly and transiently repressed by treatment with CD40 ligand, a T helper signal that induces B cell activation. Using a fluorescence activated cell sorter, we have purified B-lineage cells into distinct populations based on their differential expression of cell surface markers. Clast6/E3/LAPTM5 was found to be highly expressed in progenitor and precursor B cells, downregulated in late pre-B and immature B cells, and upregulated again in mature B and the germinal center B cells. Interestingly, Clast6/E3/LAPTM5 was expressed at high levels in malignant B lymphomas. These results reveal stage-specific expression of Clast6/E3/LAPTM5 during B cell differentiation and implicates its possible involvement in B cell malignancies.
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Document Type: Research Article

Affiliations: Division of Pathology, Chiba Cancer Center Research Institute, Chiba 260-8717, Japan

Publication date: February 1, 2003

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  • The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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