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2016 ; 7
(ä): 326
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A Well-Controlled Experimental System to Study Interactions of Cytotoxic T
Lymphocytes with Tumor Cells
#MMPMID27625650
Neubert NJ
; Soneson C
; Barras D
; Baumgaertner P
; Rimoldi D
; Delorenzi M
; Fuertes Marraco SA
; Speiser DE
Front Immunol
2016[]; 7
(ä): 326
PMID27625650
show ga
While T cell-based immunotherapies are steadily improving, there are still many
patients who progress, despite T cell-infiltrated tumors. Emerging evidence
suggests that T cells themselves may provoke immune escape of cancer cells. Here,
we describe a well-controlled co-culture system for studying the dynamic T cell -
cancer cell interplay, using human melanoma as a model. We explain starting
material, controls, and culture parameters to establish reproducible and
comparable cultures with highly heterogeneous tumor cells. Low passage melanoma
cell lines and melanoma-specific CD8+ T cell clones generated from patient blood
were cultured together for up to 3?days. Living melanoma cells were isolated from
the co-culture system by fluorescence-activated cell sorting. We demonstrate that
the characterization of isolated melanoma cells is feasible using flow cytometry
for protein expression analysis as well as an Agilent whole human genome
microarray and the NanoString technology for differential gene expression
analysis. In addition, we identify five genes (ALG12, GUSB, RPLP0, KRBA2, and
ADAT2) that are stably expressed in melanoma cells independent of the presence of
T cells or the T cell-derived cytokines IFN? and TNF?. These genes are essential
for correct normalization of gene expression data by NanoString. Further to the
characterization of melanoma cells after exposure to CTLs, this experimental
system might be suitable to answer a series of questions, including how the
affinity of CTLs for their target antigen influences the melanoma cell response
and whether CTL-induced gene expression changes in melanoma cells are reversible.
Taken together, our human T cell - melanoma cell culture system is well suited to
characterize immune-related mechanisms in cancer cells.