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2017 ; 36
(1
): 116
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NLRP3 inflammasome activation promotes inflammation-induced carcinogenesis in
head and neck squamous cell carcinoma
#MMPMID28865486
Huang CF
; Chen L
; Li YC
; Wu L
; Yu GT
; Zhang WF
; Sun ZJ
J Exp Clin Cancer Res
2017[Sep]; 36
(1
): 116
PMID28865486
show ga
BACKGROUND: NLRP3 inflammasome acts as a danger signal sensor that triggers and
coordinates the inflammatory response. However, the roles of NLRP3 inflammasome
in the tumorigenesis and development of cancer stem cells (CSCs) of squamous cell
carcinoma of the head and neck (SCCHN) remain ambiguous. METHODS: In our study,
tissue microarrays, ELISA, sphere-forming assay, colony formation assay and
Western blot analysis were performed to evaluate the effect of NLRP3 inflammasome
on the development of CSCs in human SCCHN tissue specimen, cell lines, and
transgenic mouse SCCHN model. RESULTS: The components of NLRP3 inflammasome,
namely, NLRP3, ASC, Caspase-1, and IL-18 were correlated with CSCs markers BMI1,
ALDH1 and CD44 in human SCCHN specimens. Moreover, NLRP3, Caspase-1, IL-1?, and
IL-18 were highly expressed in SCCHN cell lines. NLRP3 inflammasome activated by
LPS and ATP promoted sphere-forming and colony formation capacities along with an
upregulation of BMI1, ALDH1 and CD44. In addition, NLRP3 inflammasome blockade by
NLRP3 inhibitor MCC950 reduced sphere and colony number, also decreased the
expression of BMI1, ALDH1 and CD44 in SCCHN cell lines. Expression of NLRP3, ASC,
Caspase-1, IL-1?, IL-18, BMI1, ALDH1 and CD44 was upregulated in Tgfbr1/Pten 2cKO
mouse SCCHN model, and NLRP3 inflammasome expression was closely related to those
CSCs makers in mice SCCHN. However, MCC950 treatment reduced the expression of
NLRP3 inflammasome, CSCs markers BMI1, ALDH1 and CD44 in Tgfbr1/Pten 2cKO mice
SCCHN. In addition, blockade of NLRP3 inflammasome can also delayed the
tumor-burdened speed in SCCHN mice. CONCLUSIONS: Our study demonstrates that
NLRP3 inflammasome was upregulated and associated with the carcinogenesis and
CSCs self-renewal activation in SCCHN. NLRP3 inflammasome can be a potential
target in the development of novel approaches for head and neck squamous cell
carcinoma therapy.