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2017 ; 8
(ä): 15327
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Replicating viral vector platform exploits alarmin signals for potent CD8(+) T
cell-mediated tumour immunotherapy
#MMPMID28548102
Kallert SM
; Darbre S
; Bonilla WV
; Kreutzfeldt M
; Page N
; Müller P
; Kreuzaler M
; Lu M
; Favre S
; Kreppel F
; Löhning M
; Luther SA
; Zippelius A
; Merkler D
; Pinschewer DD
Nat Commun
2017[May]; 8
(ä): 15327
PMID28548102
show ga
Viral infections lead to alarmin release and elicit potent cytotoxic effector T
lymphocyte (CTL(eff)) responses. Conversely, the induction of protective
tumour-specific CTL(eff) and their recruitment into the tumour remain challenging
tasks. Here we show that lymphocytic choriomeningitis virus (LCMV) can be
engineered to serve as a replication competent, stably-attenuated immunotherapy
vector (artLCMV). artLCMV delivers tumour-associated antigens to dendritic cells
for efficient CTL priming. Unlike replication-deficient vectors, artLCMV targets
also lymphoid tissue stroma cells expressing the alarmin interleukin-33. By
triggering interleukin-33 signals, artLCMV elicits CTL(eff) responses of higher
magnitude and functionality than those induced by replication-deficient vectors.
Superior anti-tumour efficacy of artLCMV immunotherapy depends on interleukin-33
signalling, and a massive CTL(eff) influx triggers an inflammatory conversion of
the tumour microenvironment. Our observations suggest that replicating viral
delivery systems can release alarmins for improved anti-tumour efficacy. These
mechanistic insights may outweigh safety concerns around replicating viral
vectors in cancer immunotherapy.
|Alarmins/*immunology
[MESH]
|Animals
[MESH]
|Antigens, Neoplasm/immunology
[MESH]
|Cancer Vaccines/*immunology/therapeutic use
[MESH]
|Cell Line, Tumor
[MESH]
|Dendritic Cells/immunology
[MESH]
|Gene Expression Profiling
[MESH]
|Genetic Engineering
[MESH]
|Genetic Vectors/genetics/immunology/therapeutic use
[MESH]