Characterization of small spheres derived from various solid tumor cell lines: are they suitable targets for T cells? View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2013-08

AUTHORS

Antonia Busse, Anne Letsch, Alberto Fusi, Anika Nonnenmacher, David Stather, Sebastian Ochsenreither, Christian RA Regenbrecht, Ulrich Keilholz

ABSTRACT

T cell based immunotherapy has been investigated in a variety of malignancies and analyses have been mostly founded on in vitro data with tumor cell monolayers. However, three-dimensional (3D) culture models might mimic more closely the 'in vivo' conditions than 2D monolayers. Therefore, we analyzed the expression of tumor-associated antigens (TAA) and of molecules involved in antigen processing and presentation (APM) in tumor spheres, which served as an in vitro model for micrometastasis which might be enriched in tumor propagating cancer stem cells. For enrichment of sphere cells 12 human solid tumor cell lines were cultured in serum-free medium. Expression of a variety of TAA and APM were analyzed by RT-PCR and/or flow cytometry and compared to expression in corresponding adherent bulk cells grown in regular growth medium. Compared to adherent cells, spheres showed equal or higher mRNA expression levels of LMP2, LMP7 and MECL-1, of TAP1 and TAP2 transporters and, surprisingly, also of TAA including differentiation antigens. However, downregulation or loss of HLA-I and HLA-II molecules in spheres was observed in 8 of 10 and 1 of 2 cell lines, respectively, and was unresponsive to stimulation with IFN-γ. Although tumor spheres express TAA and molecules of intracellular antigen processing, they are defective in antigen presentation due to downregulation of HLA surface expression which may lead to immune evasion. More... »

PAGES

781-791

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10585-013-9578-5

    DOI

    http://dx.doi.org/10.1007/s10585-013-9578-5

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1042535698

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/23519726


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