DOCK6 promotes chemo- and radioresistance of gastric cancer by modulating WNT/β-catenin signaling and cancer stem cell traits.
Animals
Cell Line, Tumor
Cell Movement
/ genetics
Cell Proliferation
/ genetics
Disease Models, Animal
Disease Progression
Drug Resistance, Neoplasm
/ genetics
Gene Expression Regulation, Neoplastic
Gene Silencing
Guanine Nucleotide Exchange Factors
/ genetics
Heterografts
Humans
Immunohistochemistry
Immunophenotyping
Mice
Neoplastic Stem Cells
/ metabolism
Phenotype
Radiation Tolerance
/ genetics
Stomach Neoplasms
/ genetics
Wnt Signaling Pathway
Journal
Oncogene
ISSN: 1476-5594
Titre abrégé: Oncogene
Pays: England
ID NLM: 8711562
Informations de publication
Date de publication:
09 2020
09 2020
Historique:
received:
14
04
2019
accepted:
07
07
2020
pubmed:
6
8
2020
medline:
1
12
2020
entrez:
6
8
2020
Statut:
ppublish
Résumé
Gastric cancer (GC) is the third leading cause of cancer-related mortality worldwide and prognosis after potentially curative gastrectomy remains poor. Administration of GC-targeting molecules in combination with adjuvant chemo- or radiotherapy following surgical resection has been proposed as a potentially effective treatment option. Here, we have identified DOCK6, a guanine nucleotide exchange factor (GEF) for Rac1 and CDC42, as an independent biomarker for GC prognosis. Clinical findings indicate the positive correlation of higher DOCK6 expression with tumor size, depth of invasion, lymph node metastasis, vascular invasion, and pathological stage. Furthermore, elevated DOCK6 expression was significantly associated with shorter cumulative survival in both univariate and multivariate analyses. Gene ontology analysis of three independent clinical GC cohorts revealed significant involvement of DOCK6-correlated genes in the WNT/β-catenin signaling pathway. Ectopic expression of DOCK6 promoted GC cancer stem cell (CSC) characteristics and chemo- or radioresistance concomitantly through Rac1 activation. Conversely, depletion of DOCK6 suppressed CSC phenotypes and progression of GC, further demonstrating the pivotal role of DOCK6 in GC progression. Our results demonstrate a novel mechanistic link between DOCK6, Rac1, and β-catenin in GCCSC for the first time, supporting the utility of DOCK6 as an independent marker of GC.
Identifiants
pubmed: 32753649
doi: 10.1038/s41388-020-01390-0
pii: 10.1038/s41388-020-01390-0
doi:
Substances chimiques
DOCK6 protein, human
0
Guanine Nucleotide Exchange Factors
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
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