T-Cell activation by t(9;22) acute lymphoblastic leukemia-derived dendritic-like cells is associated with increased tapasin expression.


Journal Article

Dendritic-like cells from t(9;22) acute lymphoblastic leukemia (ALL) blasts can activate T cells, while the original unmodified leukemic blasts cannot. To determine whether these functional differences were associated with differences in antigen-processing machinery (APM) component expression, we have measured the level of APM component expression in unmodified blasts and ALL-derived dendritic-like cells. Seven t(9;22) ALL patient samples and one cell line were studied for APM component expression utilizing a unique panel of recently developed monoclonal antibodies and a recently developed intracellular staining technique. In addition, the HLA class I antigen cell surface expression was measured. HLA class I antigens were similarly expressed on the unmodified blasts and on the autologous dendritic-like cells. Intracellular HLA class I antigen and tapasin expression (P=0.03 for both) were upregulated in all t(9;22) ALL-derived dendritic-like cells, in comparison to the unmodified blasts. These results provide a potential mechanism for the ability of t(9;22) ALL-derived dendritic-like cells to induce T-cell activation and, suggest that tapasin upregulation may serve as a marker to standardize and monitor the quality of the dendritic-like cells used in immunotherapy.

Full Text

Duke Authors

Cited Authors

  • Claus, JA; Brady, MT; Lee, J; Donohue, KA; Sait, SN; Ferrone, S; Wetzler, M

Published Date

  • February 2006

Published In

Volume / Issue

  • 55 / 2

Start / End Page

  • 160 - 165

PubMed ID

  • 16010586

Pubmed Central ID

  • 16010586

International Standard Serial Number (ISSN)

  • 0340-7004

Digital Object Identifier (DOI)

  • 10.1007/s00262-005-0012-y


  • eng

Conference Location

  • Germany