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2016 ; 7
(17
): 23425-38
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Tumor growth suppressive effect of IL-4 through p21-mediated activation of STAT6
in IL-4R? overexpressed melanoma models
#MMPMID26993600
Lee HL
; Park MH
; Song JK
; Jung YY
; Kim Y
; Kim KB
; Hwang DY
; Yoon do Y
; Song MJ
; Han SB
; Hong JT
Oncotarget
2016[Apr]; 7
(17
): 23425-38
PMID26993600
show ga
To evaluate the significance of interleukin 4 (IL-4) in tumor development, we
compared B16F10 melanoma growth in IL-4-overespressing transgenic mice (IL-4
mice) and non-transgenic mice. In IL-4 mice, reduced tumor volume and weight were
observed when compared with those of non-transgenic mice. Significant activation
of DNA binding activity of STAT6, phosphorylation of STAT6 as well as IL-4,
IL-4R? and p21 expression were found in the tumor tissues of IL-4 mice compared
to non-transgenic mice. Higher expression of IL-4, STAT6 and p21 in human
melanoma tissue compared to normal human skin tissue was also found. Higher
expression of apoptotic protein such as cleaved caspase-3, cleaved caspase-8,
cleaved caspase-9, Bax, p53 and p21, but lower expression levels of survival
protein such as Bcl-2 were found in the tumor of IL-4 mice. In vitro study, we
found that overexpression of IL-4 significantly inhibited SK-MEL-28 human
melanoma cell and B16F10 murine melanoma cell growth via p21-mediated activation
of STAT6 pathway as well as increased expression of apoptotic cell death
proteins. Moreover, p21 knockdown with siRNA abolished IL-4 induced activation of
STAT6 and expression of p53 and p21 accompanied with reduced IL-4 expression as
well as melanoma cell growth inhibition. Therefore, these results showed that
IL-4 overexpression suppressed tumor development through p21-mediated activation
of STAT6 pathways in melanoma models.