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PRICKLE4 Underlies IDH mutant Tumors Resistance against PARP Inhibition

ABSTRACT: Mutations in isocitrate dehydrogenase (IDH) genes render affected gliomas sensitive to PARP inhibition due to epigenetic reprogramming of the DNA damage repair circuits. However, PARPi treated tumor eventually relapse. We report in this study that anti-angiogenetic agent lenvatinib efficiently cooperate with PARPi and the combination therapy induces marked tumor regression and significant extension of survival time. Genomic study with PARPi and lenvatinib treated tumor samples uncovered that PARPi evokes global transcriptome changes that are overall pro-inflammatory, thus inducing tumor angiogenesis. We identified that prickle planar cell polarity protein 4 (Prickle4) as the specific mediator for PARPi induced neovascularization. Suppression of Prickle4 efficiently overcomes PARPi resistance in these tumors. Overall, multimodality therapy combining PARPi and anti-angiogenetic agents represents a feasible treatment that is of excellent potential for clinical applications.

ORGANISM(S): Mus musculus

PROVIDER: GSE249818 | GEO | 2024/05/01

REPOSITORIES: GEO

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Project description:Abstract: Cancer-associated fibroblasts (CAFs) play an important role in the induction of chemo-resistance. The objectives of this study were to clarify the mechanism underlying CAF-mediated sorafenib/lenvatinib resistance and identify a novel therapeutic target to overcome resistance to sorafenib/lenvatinib in hepatocellular carcinoma (HCC). Methods: Whole transcriptome sequencing (WTS) data of nine pairs of CAFs and para-cancer-associated fibroblasts (PAFs) were analyzed to identify key molecules that induce resistance to tyrosine kinase inhibitors (TKIs). In vitro and in vivo experiments were performed to validate selected targets and related mechanisms. Plasma secreted phosphoprotein 1 (SPP1) expression levels prior to sorafenib/lenvatinib treatment as well as progression-free survival (PFS) and overall survival (OS) of an advanced HCC cohort (n=42) were evaluated using Kaplan–Meier analysis. Results: Co-culturing CAFs and HCC cells significantly reduced the responsiveness of HCC cells to sorafenib/lenvatinib, in vitro and in vivo. Systematic integrative analysis of the WTS data of CAFs/PAFs and publicly available gene expression data indicated that CAF-derived SPP1 (CAF-SPP1) was suitable for use as a candidate molecule to induce sorafenib/lenvatinib resistance. An evaluation of the mechanisms involved indicated that CAF-SPP1 increased phosphorylation of PKCɑ, which then activated rapidly accelerated fibrosarcoma (RAF)-extracellular signal-related kinase 1/2-signal transducer and activator of transcription 3 (STAT3) and phosophoinositide 3-kinase (PI3K)-AKT-mechanistic target of rapamycin kinase (mTOR) in HCC cells. SPP1 inhibitors reversed CAF-induced sorafenib/lenvatinib resistance in vitro and in vivo. Patients showing high plasma SPP1 prior to sorafenib/lenvatinib treatment exhibited significantly poor PFS (P=0.005) and OS (P=0.041). Conclusions: CAF-SPP1 enhances sorafenib/lenvatinib resistance in HCC by alternatively activating oncogenic pathways via PKCɑ phosphorylation. Inhibition of CAF-SPP1 may be utilized as a therapeutic strategy against TKI resistance in HCC. Plasma SPP1 level prior to TKI treatment shows potential as a promising biomarker for predicting sorafenib/lenvatinib response in advanced HCC patients.

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PRICKLE4 Underlies IDH mutant Tumors Resistance against PARP Inhibition

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