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Targeting β-catenin overcomes resistance to MEK inhibitor in PIK3CA mutant colon cancer

ABSTRACT: Mitogen-activated protein kinases (MEK 1/2) are central components of the RAS signaling pathway and attractive targets for cancer therapy. However, PIK3CA mutation, which commonly co-occurs with KRAS mutation, offered resistance to MEK inhibitor through activation of PI3K-AKT signaling. We identified a gene that cooperates with MEK inhibitors to forcefully treat PIK3CA mutant colon cancer cells. -catenin, a key molecule of the WNT pathway, emerged as a candidate by protein/Ab Chip array. MEK inhibitor treatment led to a decrease in -catenin in PIK3CA wild-type colon cancer cells but not in PIK3CA mutant colon cancer cells. Tumor regression was promoted by a combination of MEK inhibitor and NVP-TNS656, which targets the WNT pathway. Furthermore, combined inhibition of MEK and -catenin by NVP-TNS656 promoted tumor regression in colon cancer patient-derived xenograft (PDX) models expressing mutant PIK3CA. Taken together, we propose that inhibition of the WNT pathway, particularly -catenin, may bypass resistance to MEK inhibitor in human PIK3CA mutant colon cancer. Additionally, -catenin is a potential PD marker of MEK inhibitor resistance.

ORGANISM(S): Homo sapiens

PROVIDER: GSE71981 | GEO | 2015/08/13

SECONDARY ACCESSION(S): PRJNA292658

REPOSITORIES: GEO

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Targeting β-catenin overcomes resistance to MEK inhibitor in PIK3CA mutant colon cancer

Project description:Mitogen-activated protein kinases (MEK 1/2) are central components of the RAS signaling pathway and attractive targets for cancer therapy. However, PIK3CA mutation, which commonly co-occurs with KRAS mutation, offered resistance to MEK inhibitor through activation of PI3K-AKT signaling. We identified a gene that cooperates with MEK inhibitors to forcefully treat PIK3CA mutant colon cancer cells. -catenin, a key molecule of the WNT pathway, emerged as a candidate by protein/Ab Chip array. MEK inhibitor treatment led to a decrease in -catenin in PIK3CA wild-type colon cancer cells but not in PIK3CA mutant colon cancer cells. Tumor regression was promoted by a combination of MEK inhibitor and NVP-TNS656, which targets the WNT pathway. Furthermore, combined inhibition of MEK and -catenin by NVP-TNS656 promoted tumor regression in colon cancer patient-derived xenograft (PDX) models expressing mutant PIK3CA. Taken together, we propose that inhibition of the WNT pathway, particularly -catenin, may bypass resistance to MEK inhibitor in human PIK3CA mutant colon cancer. Additionally, -catenin is a potential PD marker of MEK inhibitor resistance. In the study, we identified and evaluated biomarker for response to MEK inhibitor on colon cancer cells.

2015-08-13 | E-GEOD-71981 | biostudies-arrayexpress

HGPalmer-PDX-NVP-TNKS656

Project description:Strong activation of the oncogenic Wnt/beta-catenin pathway is a main mechanism of resistance to FOXO3a-induced apoptosis promoted by PI3K and AKT inhibitors in colorectal cancer (CRC). Reducing Wnt/beta-catenin activity would sensitize colorectal tumors to these inhibitors. However, no Wnt/beta-catenin signaling inhibitor has proven clinical potential yet. Recently, inhibitors that block tankyrases were shown to reduce colon cancer cell proliferation by decreasing nuclear beta-catenin. We aim to identify determinants of response to these novel Wnt-inhibitors. Therefore, we treated in vivo three different patient-derived xenograft models (PDX; P2, P5 and P30) growing subcutaneously in NOD SCID mice with the novel tankyrase inhibitor NVP-TNKS656.

2015-08-10 | E-MTAB-2446 | biostudies-arrayexpress

Homo sapiens

Project description:Targeting β-catenin overcomes resistance to MEK inhibitor in PIK3CA mutant colon cancer

| PRJNA292658 | ENA

Inhibiting tankyrases sensitizes KRAS mutant cancer cells to MEK inhibitors by FGFR2 feedback signaling

Project description:Tankyrases (TNKS) play roles in Wnt signaling, telomere homeostasis and mitosis, offering attractive targets for anti-cancer treatment. Using unbiased combination screening in a large panel of cancer cell lines, we have identified a strong synergy between TNKS and MEK inhibitors in KRAS mutant cancer cells. Our study uncovers a novel function of TNKS in the relief of a feedback loop induced by MEK inhibition on FGFR2 signaling pathway. Moreover, dual inhibition of TNKS and MEK leads to more robust apoptosis and anti-tumor activity both in vitro and in vivo than effects observed by previously reported MEK inhibitor combinations. Altogether, our results show how a novel combination of TNKS and MEK inhibitors can be highly effective in targeting KRAS mutant cancers by suppressing a newly discovered resistance mechanism. This experiment is designed to detect genes differentially expressed in the combination treatment compared to others SW480 cells were seeded in 10cm dishes and treated for 4h and 16h with DMSO, TNKS inhibitor (TNKSi : NVP-TNKS656), MEK inhibitor (MEKi : AZD6244) or the combination of both at 1uM final

2014-03-06 | E-GEOD-55624 | biostudies-arrayexpress

Small molecule inhibition of MEK activates Wnt signalling and leads to reprogramming of colon cancer stem cells [Affymetrix]

Project description:Resistance to Ras pathway inhibition is a major challenge in the treatment of colorectal cancer (CRC), but the underlying mechanisms are incompletely understood. Here we performed large-scale small molecule screens in CRC and identified inhibitors of MEK1/2 as potent activators of Wnt/beta-catenin signalling. Targeting MEK increased Wnt activity in different CRC cell lines and in the murine intestine in vivo. The MEK-induced Wnt response was strongly enhanced by truncating mutations in APC and proteomic experiments identified that AXIN1 levels are depleted upon MEK inhibition. We generated patient-derived colon cancer organoids and showed that a clinically approved MEK inhibitor leads to increased Wnt activity, elevated LGR5 levels and enrichment of gene signatures associated with stem cells and cancer relapse. This reprogramming was reverted by co-treatment with Wnt inhibitors. Our study demonstrates that MEK inhibition affects cellular plasticity and induces an intestinal stem cell program which constitutes a novel mechanism of drug resistance.

2018-05-08 | GSE114060 | GEO

Small molecule inhibition of MEK activates Wnt signalling and leads to reprogramming of colon cancer stem cells [Illumina]

2018-05-08 | GSE114059 | GEO

Transcriptional responses to Wnt pathway stimulation in mouse embryonic stem cells cultured in serum+LIF condition

Project description:The objective of this study was to identify genes regulated by canonical Wnt signaling in mouse embryonic stem cells (ESCs).Canonical Wnt signaling supports the pluripotency of mouse ESCs but also promotes differentiation of early mammalian cell lineages. To explain these paradoxical observations, we explored the gene regulatory networks at play. Canonical Wnt signaling is intertwined with the pluripotency network comprising Nanog, Oct4, and Sox2 in mouse ESCs. In defined media supporting the derivation and propagation of mouse ESCs, Tcf3 and ?-catenin interact with Oct4; Tcf3 binds to Sox motif within Oct-Sox composite motifs that are also bound by Oct4-Sox2 complexes. Further, canonical Wnt signaling up-regulates the activity of the Pou5f1 distal enhancer via the Sox motif in mouse ESCs. When viewed in the context of published studies on Tcf3 and ?-catenin mutants, our findings suggest that Tcf3 counters pluripotency by competition with Sox2 at these sites, and Tcf3 inhibition is blocked by ?-catenin entry into this complex. Wnt pathway stimulation also triggers ?-catenin association at regulatory elements with classic Lef/Tcf motifs associated with differentiation programs. The failure to activate these targets in the presence of a MEK/ERK inhibitor essential for mouse ESC culture suggests that MEK/ERK signaling and canonical Wnt signaling combine to promote mouse ESC differentiation. Triplicates of mouse embryonic stem cells cultured with GSK3 inhibitor CHIR99021 or with Wnt pathway inhibitor XAV939.

2013-03-01 | E-GEOD-43420 | biostudies-arrayexpress

Expression data from Control or TRIB3-silenced HCT-8 cells

Project description:To determine the critical mediator of TRIB3-enhanced Wnt/beta-catenin signaling, we examined the expression profile of genes that might regulate Wnt/beta-catenin by using mRNA microarrays. Aberrant activation of Wnt/beta-catenin signaling pathway is a major reason for the tumorigenesis of Colon cancer. However, no specific drug targeting this pathway has been in the market. Surgery combined with cytotoxic drugs are still the major therapy methods toward colon cancer. These highlighted the need for therapeutics with alternative mechanisms of action. Here we report that the elevated TRIB3 expression associates positively with Wnt/beta-catenin signaling pathway. TRIB3 interacts with beta-catenin and TCF4 to enhance the associations between TCF4/beta-catenin target genes’ promoters, which upregulates the transcriptional activity of beta-catenin, thus to promote the CSC stemness and colon cancer tumorigenesis.

2020-11-17 | GSE107094 | GEO

Identification of beta-catenin binding regions in SW480 cells

Project description:Deregulation of canonical Wnt/beta-catenin pathway is one of the earliest events in the pathogenesis of colon cancer. Mutations in APC or CTNNB1 (beta-catenin gene) are highly frequent in colon cancer and cause aberrant stabilization of b-catenin, which activates the transcription of Wnt target genes by binding to chromatin via the TCF/LEF transcription factors. Here we report an integrative analysis of genome-wide chromatin occupancy of b-catenin by chromatin immunoprecipitation coupled with high-throughput sequencing (ChIP-seq) and gene expression profiling by microarray analysis upon RNAi-mediated knockdown of beta-catenin in colon cancer cells (GSE53656). Immunoprecipitated samples from human colon cancer SW480 cells with antibodies against beta-catenin and control IgG respectively were used for ChIP-seq experiments.

2014-03-12 | E-GEOD-53927 | biostudies-arrayexpress

Transcriptional responses to GSK3 inhibitor and MEK inhibitor on 2i-adapted mouse embryonic stem cells

Project description:The objective of this study was to investigate the roles of GSK3 inhibitor CHIR99021 and MEK inhibitor PD0325901 on 2i-adapted mouse embryonic stem cells (ESCs) in serum-free conditions.Canonical Wnt signaling supports the pluripotency of mouse ESCs but also promotes differentiation of early mammalian cell lineages. To explain these paradoxical observations, we explored the gene regulatory networks at play. Canonical Wnt signaling is intertwined with the pluripotency network comprising Nanog, Oct4, and Sox2 in mouse ESCs. In defined media supporting the derivation and propagation of mouse ESCs, Tcf3 and β-catenin interact with Oct4; Tcf3 binds to Sox motif within Oct-Sox composite motifs that are also bound by Oct4-Sox2 complexes. Further, canonical Wnt signaling up-regulates the activity of the Pou5f1 distal enhancer via the Sox motif in mouse ESCs. When viewed in the context of published studies on Tcf3 and β-catenin mutants, our findings suggest that Tcf3 counters pluripotency by competition with Sox2 at these sites, and Tcf3 inhibition is blocked by β-catenin entry into this complex. Wnt pathway stimulation also triggers β-catenin association at regulatory elements with classic Lef/Tcf motifs associated with differentiation programs. The failure to activate these targets in the presence of a MEK/ERK inhibitor essential for mouse ESC culture suggests that MEK/ERK signaling and canonical Wnt signaling combine to mouse promote ESC differentiation. Triplicates of mouse embryonic stem cells cultured under the following conditions: 1) CHIR99021+PD0325901+LIF; 2) CHIR99021+PD0325901; 3) CHIR99021; 4) PD0325901; 5) DMSO

2013-03-01 | E-GEOD-43421 | biostudies-arrayexpress

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