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2018 ; 15
(4
): 4797-4804
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MicroRNA-374b inhibits liver cancer progression via down regulating programmed
cell death-1 expression on cytokine-induced killer cells
#MMPMID29552119
Huang F
; Wang B
; Zeng J
; Sang S
; Lei J
; Lu Y
Oncol Lett
2018[Apr]; 15
(4
): 4797-4804
PMID29552119
show ga
Programmed cell death-1 (PD-1) is an oncogene associated with suppressing
proliferation and cytokine production of T cells in the progression of liver
cancer. microRNAs (miRs) regulate gene expression via specific binding to the
target 3'untranslated region of mRNA. In the present study, miR-374b was
indicated to interact with PD-1 and affect the tumor-targeting capacity of
cytokine-induced killer (CIK) cells. miR-374b inhibitor significantly increased
PD-1 expression in CIK cells. A synthetic small interfering (si)RNA targeting
PD-1 was employed to silence the expression level of PD-1 in CIK cells. Then, the
antitumor effect of siPD-1 in CIK cells was investigated. In vitro study
demonstrated that IFN-? secretion and the concentration of lactate dehydrogenase
were significantly increased in the PD-1 knockdown group; however, the viability
of HepG2 cells in the PD-1 knockdown group had significantly decreased, compared
with the HepG2 cells in the negative control group. In vivo study indicated that
mice inoculated with HepG2 cells and CIK cells with PD-1 knocked down had a
significantly smaller tumor volume, compared with the control group. To conclude,
human CIK cells transfected with siPD-1 can target liver cancer cells and enhance
immunotherapy efficacy, and therefore they have potential in the immunotherapy of
liver cancer.