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2017 ; 12
(3
): e0174077
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Generation of murine tumor cell lines deficient in MHC molecule surface
expression using the CRISPR/Cas9 system
#MMPMID28301575
Das K
; Eisel D
; Lenkl C
; Goyal A
; Diederichs S
; Dickes E
; Osen W
; Eichmüller SB
PLoS One
2017[]; 12
(3
): e0174077
PMID28301575
show ga
In this study, the CRISPR/Cas9 technology was used to establish murine tumor cell
lines, devoid of MHC I or MHC II surface expression, respectively. The melanoma
cell line B16F10 and the murine breast cancer cell line EO-771, the latter stably
expressing the tumor antigen NY-BR-1 (EO-NY), were transfected with an expression
plasmid encoding a ?2m-specific single guide (sg)RNA and Cas9. The resulting MHC
I negative cells were sorted by flow cytometry to obtain single cell clones, and
loss of susceptibility of peptide pulsed MHC I negative clones to
peptide-specific CTL recognition was determined by IFN? ELISpot assay. The ?2m
knockout (KO) clones did not give rise to tumors in syngeneic mice (C57BL/6N),
unless NK cells were depleted, suggesting that outgrowth of the ?2m KO cell lines
was controlled by NK cells. Using sgRNAs targeting the ?-chain encoding locus of
the IAb molecule we also generated several B16F10 MHC II KO clones. Peptide
loaded B16F10 MHC II KO cells were insusceptible to recognition by OT-II cells
and tumor growth was unaltered compared to parental B16F10 cells. Thus, in our
hands the CRISPR/Cas9 system has proven to be an efficient straight forward
strategy for the generation of MHC knockout cell lines. Such cell lines could
serve as parental cells for co-transfection of compatible HLA alleles together
with human tumor antigens of interest, thereby facilitating the generation of HLA
matched transplantable tumor models, e.g. in HLAtg mouse strains of the newer
generation, lacking cell surface expression of endogenous H2 molecules. In
addition, our tumor cell lines established might offer a useful tool to
investigate tumor reactive T cell responses that function independently from MHC
molecule surface expression by the tumor.
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