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CD20 positive cells are undetectable in the majority of multiple myeloma cell lines and are not associated with a cancer stem cell phenotype.

Abstract: Although new therapies have doubled the survival of multiple myeloma patients, this remains an incurable disease. It has been postulated that the so-called myeloma cancer stem cells would be responsible for tumor initiation and relapse but their unequivocal identification remains unclear. Here, we investigated in a panel of myeloma cell lines the presence of CD20+ cells harboring a stem-cell phenotype. Thus, only a small population of CD20dim+ cells (0.3%) in the RPMI-8226 cell line was found. CD20dim+ RPMI-8226 cells expressed the plasma cell markers CD38 and CD138 and were CD19?CD27?. Additionally, CD20dim+ RPMI-8226 cells did not exhibit stem-cell markers as shown by gene expression profiling and the aldehyde dehydrogenase assay. Furthermore, we demonstrated that CD20dim+ RPMI-8226 cells are not essential for CB17-SCID mice engraftment and show lower self-renewal potential than the CD20? RPMI-8226 cells. These results do not support CD20 expression for the identification of myeloma cancer stem cells.

 Fuente: Haematologica, 2012, 97(7), 1110-1114

 Editorial: Ferrata Storti Foundation

 Año de publicación: 2012

 Nº de páginas: 5

 Tipo de publicación: Artículo de Revista

 DOI: 10.3324/haematol.2011.057372

 ISSN: 0390-6078,1592-8721

 Url de la publicación: https://doi.org/10.3324/haematol.2011.057372

Autoría

PAIVA, BRUNO

SAN-SEGUNDO, LAURA

GARAYOA, MERCEDES

GUTIÉRREZ, NORMA C.

EUGENIA SARASQUETE M.

PANDIELLA, ATANASIO

ORFAO, ALBERTO

SAN MIGUEL, JESÚS F.