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BI-3406, a potent and selective SOS1::KRAS interaction inhibitor, is effective in KRAS-driven cancers through combined MEK inhibition

ABSTRACT: BI-3406, a potent and selective SOS1::KRAS interaction inhibitor, is effective in KRAS-driven cancers through combined MEK inhibition

PROVIDER: PRJNA527301 | ENA |

REPOSITORIES: ENA

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BI-3406, a potent and selective SOS1::KRAS interaction inhibitor, is effective in KRAS-driven cancers through combined MEK inhibition

Project description:KRAS is the most frequently mutated driver of pancreatic, colorectal, and non-small cell lung cancers. Direct KRAS blockade has proven challenging and inhibition of a key downstream effector pathway, the RAF-MEK-ERK cascade, has shown limited success due to activation of feedback networks that keep the pathway in check. We hypothesized that inhibiting SOS1, a KRAS activator and important feedback node, represents an effective approach to treat KRAS-driven cancers. We report the discovery of a highly potent, selective and orally bioavailable small-molecule SOS1 inhibitor, BI-3406, that binds to the catalytic domain of SOS1 thereby preventing the interaction with KRAS. BI-3406 reduces formation of GTP-loaded RAS and limits cellular proliferation of a broad range of KRAS-driven cancers. Importantly, BI-3406 attenuates feedback reactivation induced by MEK inhibitors and thereby enhances sensitivity of KRAS-dependent cancers to MEK inhibition. Combined SOS1 and MEK inhibition represents a novel and effective therapeutic concept to address KRAS-driven tumors.

2020-08-20 | GSE128385 | GEO

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

Synergistic activity and heterogeneous acquired resistance of combined MDM2 and MEK inhibition in KRAS mutant cancers

Project description:There are currently no effective targeted therapies for KRAS mutant cancers. Therapeutic strategies that combine MEK inhibitors with agents that target apoptotic pathways may be a promising therapeutic approach. We investigated combining MEK and MDM2 inhibitors as a potential treatment strategy for KRAS mutant non-small cell lung cancers and colorectal carcinomas that harbor wild-type TP53. The combination of pimasertib (MEK inhibitor) + SAR405838 (MDM2 inhibitor) was synergistic and induced the expression of PUMA and BIM, led to apoptosis and growth inhibition in vitro, and tumor regression in vivo. Acquired resistance to the combination commonly resulted from the acquisition of TP53 mutations, conferring complete resistance to MDM2 inhibition. In contrast, resistant clones exhibited marked variability in sensitivity to MEK inhibition, which significantly impacted sensitivity to subsequent treatment with alternative MEK inhibitor-based combination therapies. These results highlight both the potential promise and limitations of combining MEK and MDM2 inhibitors for treatment of KRAS mutant NSCLC and CRC.

2017-08-01 | GSE99015 | GEO

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

2014-03-06 | GSE55624 | GEO

Radiation combined with KRAS-MEK inhibitors enhances anticancer immunity in KRAS-mutated tumor models [LLC RNA-seq]

Project description:KRAS mutation is a common driver in solid tumors, and KRAS-mutated tumors are relatively resistant to radiotherapy. Therefore, we investigated the combined effect of radiation and KRAS-MEK inhibitors (AMG510 and trametinib) in KRAS-mutated tumors.

2022-10-01 | GSE209766 | GEO

Radiation combined with KRAS-MEK inhibitors enhances anticancer immunity in KRAS-mutated tumor models [CT26 RNA-seq]

2022-10-01 | GSE209765 | GEO

BI-3406, a Potent and Selective SOS1-KRAS Interaction Inhibitor, Is Effective in KRAS-Driven Cancers through Combined MEK Inhibition.

Project description: Not available

| S-EPMC7892644 | biostudies-literature

A subset of metastatic pancreatic ductal adenocarcinomas depends quantitatively on oncogenic Kras/Mek/Erk-induced hyperactive mTOR signalling

Project description:Objective Oncogenic Kras-activated robust Mek/Erk signals phosphorylate to the tuberous sclerosis complex (Tsc) and deactivates mammalian target of rapamycin (mTOR) suppression in pancreatic ductal adenocarcinoma (PDAC); however, Mek and mTOR inhibitors alone have demonstrated minimal clinical antitumor activity. Design We generated transgenic mouse models in which mTOR was hyperactivated either through the Kras/Mek/Erk cascade, by loss of Pten or through Tsc1 haploinsufficiency. Primary cancer cells were isolated from mouse tumours. Oncogenic signalling was assessed in vitro and in vivo, with and without single or multiple targeted molecule inhibition. Transcriptional profiling was used to identify biomarkers predictive of the underlying pathway alterations and of therapeutic response. Results from the preclinical models were confirmed on human material. Results Reduction of Tsc1 function facilitated activation of Kras/Mek/Erk-mediated mTOR signalling, which promoted the development of metastatic PDACs. Single inhibition of mTOR or Mek elicited strong feedback activation of Erk or Akt, respectively. Only dual inhibition of Mek and PI3K reduced mTOR activity and effectively induced cancer cell apoptosis. Analysis of downstream targets demonstrated that oncogenic activity of the Mek/Erk/Tsc/mTOR axis relied on Aldh1a3 function. Moreover, in clinical PDAC samples, ALDH1A3 specifically labelled an aggressive subtype. Conclusions These results advance our understanding of Mek/Erk-driven mTOR activation and its downstream targets in PDAC, and provide a mechanistic rationale for effective therapeutic matching for Aldh1a3-positive PDACs.

2015-10-05 | GSE48643 | GEO

Somatic Loss of Wild-Type Kras Enhances Cancer Fitness and Promotes MEK Dependence

Project description:Investigating therapeutic “outliers” that show exceptional responses to anti-cancer treatment can reveal unexpected synthetic lethal interactions and uncover biomarkers of drug sensitivity. Preclinical trials investigating primary murine acute myeloid leukemias (AMLs) generated by retroviral insertional mutagenesis in KrasG12D “knock-in” mice showed that the MEK inhibitor PD0325901 (PD901) extended survival while the pan-phosphoinositide 3-kinase (PI3K) inhibitor GDC-0941 was ineffective. One outlier PD901-treated AML had a four-fold improvement in survival, and exhibited intrinsic drug resistance at relapse. This resistant leukemia arose from an evolutionary precursor of the dominant drug-sensitive AML, and KrasG12D was duplicated in both AML clones. Loss of wild-type (WT) Kras both enhanced the competitive fitness of the dominant clone and rendered it more sensitive to MEK inhibition. Similarly, colorectal cancer cell lines with loss of WT KRAS are more sensitive to MEK inhibitors, and CRISPR-Cas9-mediated replacement of WT KRAS with a mutant allele sensitized a heterozygous mutant HCT116 cells to drug treatment. In a large prospectively characterized cohort of tumors from patients with advanced and metastatic cancers, 642 of 1168 (55%) with KRAS mutations exhibited allelic imbalance. Together, these studies demonstrate that serial genetic changes at the Kras/KRAS locus are frequent in cancer, and can modulate competitive fitness and MEK dependency.

2016-12-22 | GSE92682 | GEO

Combination of a SOS1-KRAS interaction inhibitor with a KRASG12C inhibitor combination can address intrinsic and acquired resistance leading to stronger and more durable response [Tru-seq]

Project description:To investigate the transcriptomic changes associated with KRAS G12C inhibitor Adagrasib resistance and Adagrasib + SOS1 inhibitor (BI-3406) or Adagrasib + EGFR inhibitor (Cetuximab) combination treatment to overcome resistance. We performed differential gene expression analysis using RNA-seq generated from cell line derived xenograft (CDX) in vivo models. We compared different treatment conditions with DMSO treated condition.

2024-05-03 | GSE255847 | GEO

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