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2015 ; 34
(36
): 4692-701
Nephropedia Template TP
Gong X
; Yi J
; Carmon KS
; Crumbley CA
; Xiong W
; Thomas A
; Fan X
; Guo S
; An Z
; Chang JT
; Liu QJ
Oncogene
2015[Sep]; 34
(36
): 4692-701
PMID25531322
show ga
The four R-spondins (RSPO1-4) and their three related receptors LGR4, 5 and 6
(LGR4-6) have emerged as a major ligand-receptor system with critical roles in
development and stem cell survival through modulation of Wnt signaling.
Recurrent, gain-of-expression gene fusions of RSPO2 (to EIF3E) and RSPO3 (to
PTPRK) occur in a subset of human colorectal cancer. However, the exact roles and
mechanisms of the RSPO-LGR system in oncogenesis remain largely unknown. We found
that RSPO3 is aberrantly expressed at high levels in approximately half of
Keap1-mutated lung adenocarcinomas (ADs). This high RSPO3 expression is driven by
a combination of demethylation of its own promoter region and deficiency in Keap1
instead of gene fusion as in colon cancer. Patients with RSPO3-high tumors (~9%,
36/412) displayed much poorer survival than the rest of the cohort (median
survival of 28 vs 163 months, log-rank test P<0.0001). Knockdown (KD) of RSPO3,
LGR4 or their signaling mediator IQGAP1 in lung cancer cell lines with Keap1
deficiency and high RSPO3-LGR4 expression led to reduction in cell proliferation
and migration in vitro, and KD of LGR4 or IQGAP1 resulted in decrease in tumor
growth and metastasis in vivo. These findings suggest that aberrant RSPO3-LGR4
signaling potentially acts as a driving mechanism in the aggressiveness of
Keap1-deficient lung ADs.
|Adenocarcinoma of Lung
[MESH]
|Adenocarcinoma/*genetics/pathology
[MESH]
|Animals
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Proliferation/genetics
[MESH]
|Gene Expression Regulation, Neoplastic
[MESH]
|Humans
[MESH]
|Intracellular Signaling Peptides and Proteins/*genetics
[MESH]