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2016 ; 167
(6
): 1525-1539.e17
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The Hippo Pathway Kinases LATS1/2 Suppress Cancer Immunity
#MMPMID27912060
Moroishi T
; Hayashi T
; Pan WW
; Fujita Y
; Holt MV
; Qin J
; Carson DA
; Guan KL
Cell
2016[Dec]; 167
(6
): 1525-1539.e17
PMID27912060
show ga
Poorly immunogenic tumor cells evade host immunity and grow even in the presence
of an intact immune system, but the complex mechanisms regulating tumor
immunogenicity have not been elucidated. Here, we discovered an unexpected role
of the Hippo pathway in suppressing anti-tumor immunity. We demonstrate that, in
three different murine syngeneic tumor models (B16, SCC7, and 4T1), loss of the
Hippo pathway kinases LATS1/2 (large tumor suppressor 1 and 2) in tumor cells
inhibits tumor growth. Tumor regression by LATS1/2 deletion requires adaptive
immune responses, and LATS1/2 deficiency enhances tumor vaccine efficacy.
Mechanistically, LATS1/2-null tumor cells secrete nucleic-acid-rich extracellular
vesicles, which induce a type I interferon response via the Toll-like
receptors-MYD88/TRIF pathway. LATS1/2 deletion in tumors thus improves tumor
immunogenicity, leading to tumor destruction by enhancing anti-tumor immune
responses. Our observations uncover a key role of the Hippo pathway in modulating
tumor immunogenicity and demonstrate a proof of concept for targeting LATS1/2 in
cancer immunotherapy.