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2017 ; 36
(25
): 3541-3552
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RARRES2 functions as a tumor suppressor by promoting ?-catenin
phosphorylation/degradation and inhibiting p38 phosphorylation in adrenocortical
carcinoma
#MMPMID28114280
Liu-Chittenden Y
; Jain M
; Gaskins K
; Wang S
; Merino MJ
; Kotian S
; Kumar Gara S
; Davis S
; Zhang L
; Kebebew E
Oncogene
2017[Jun]; 36
(25
): 3541-3552
PMID28114280
show ga
Tumor suppressor genes and the immune system are critical players in inhibiting
cancer initiation and/or progression. However, little is known about whether a
tumor suppressor gene can function through both immune-dependent and -independent
mechanisms. Retinoic acid receptor responder 2 (RARRES2) is transcriptionally
downregulated in multiple cancer types. Previous studies suggested that it can
serve as an immune-dependent tumor suppressor by acting as a chemoattractant to
recruit anticancer immune cells expressing its receptor, the chemerin chemokine
receptor 1 (CMKLR1), to sites of tumor. In this study, we investigated the role
of RARRES2 in adrenocortical carcinoma (ACC), a rare lethal malignancy in which
aberrant Wnt/?-catenin signaling is frequently detected. We show that RARRES2
expression is downregulated in ACC as compared with normal and benign
adrenocortical tissues, which is a result of CpG hypermethylation. Despite
minimal CMKLR1 expression and lack of phenotypic tumor-suppressive effect with
exogenous RARRES2 treatment, RARRES2 overexpression in ACC cell lines not only
reduced cell proliferation, cell invasion and tumorigenicity in vitro, but also
inhibited tumor growth in vivo in two immunodeficient mouse xenograft models.
Mechanistically, RARRES2 overexpression in ACC cells inhibited Wnt/?-catenin
pathway activity by promoting ?-catenin phosphorylation and degradation, it also
inhibited the phosphorylation of p38 mitogen-activated protein kinase. Thus our
study identifies RARRES2 as a novel tumor suppressor for ACC, which can function
through an immune-independent mechanism.