Imaging-based drug screening combined with moleuclar profiling identifies signatures and drivers of therapy resistance in pediatric AML [ATAC-seq]
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE282258 | GEO | 2025/05/02
REPOSITORIES: GEO
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Project description:Despite recent advances in the understanding of genomic landscape of pediatric acute myeloid leukemia (pedAML), targeted treatments are only available for selected genomic alterations and the functional link between genotype and outcome remains partially elusive. Functional precision medicine approaches to investigate treatment resistance and patient risk have not been applied systematically for pedAML. We established an advanced functional screening platform combining high-content imaging and deep-learning-based phenotyping. In 45 pedAML patients, we identify BCL2 and FLT3 inhibitors and standard chemotherapy as major drivers of the chemosensitivity landscape, reveal substantial differential sensitivities between risk groups, and may effectively predict individual measurable residual disease and patient risk. Integration with genomic and epigenomic data uncovers a chemotherapy-resistant primitive state vulnerable to combined BCL2 and MDM2 inhibition and HDAC inhibition. Overall, we identify early present signatures of therapy resistance across genetic subgroups and prioritize targeted treatments for these functionally and epigenetically defined patient subsets.
2025-07-14 | GSE282423 | GEO
Project description:Resistance towards cancer treatment represents a major clinical obstacle, preventing cure of cancer patients. To gain mechanistic insights, we developed a model for acquired resistance to chemotherapy by treating mice carrying patient derived xenografts (PDX) of acute lymphoblastic leukemia with widely-used cytotoxic drugs for 18 consecutive weeks. In two distinct PDX samples, tumors initially responded to treatment, until stable disease and eventually tumor re-growth evolved under therapy, at highly similar kinetics between replicate mice. Notably, replicate tumors developed different mutations in TP53 and individual sets of chromosomal alterations, suggesting independent parallel clonal evolution rather than selection, driven by a combination of stochastic and deterministic processes. Transcriptome and proteome showed shared dysregulations between replicate tumors providing putative targets to overcome resistance. In vivo CRISPR/Cas9 dropout screen in PDX revealed broad dependency on BCL2, BRIP1 and COPS2. Accordingly, venetoclax re-sensitized derivative tumors towards chemotherapy, despite genomic heterogeneity, demonstrating direct translatability of the approach. Hence, despite presence of multiple resistanceassociated genomic alterations, effective rescue treatment for polychemotherapyresistant tumors can be identified using functional testing in preclinical models.
2023-01-02 | PXD036517 | Pride
Project description:Acute myeloid leukemia (AML) is an aggressive blood cancer with poor prognosis. We performed a comprehensive proteogenomic analysis of bone-marrow biopsies from 252 uniformly treated AML patients to elucidate the molecular pathophysiology of AML in order to inform future diagnostic and therapeutic approaches. In addition to in-depth quantitative proteomics, our analysis included cytogenetic and mutation profiling, and RNA sequencing. This identified five proteomic AML subtypes, each reflecting specific biological features spanning genomic boundaries. Two of these subtypes were correlated with patient outcome, but none exclusively associated with specific genomic aberrations. Remarkably, one subtype (Mito-AML), which was only captured in the proteome, was characterized by high expression of mitochondrial proteins and showed poor outcome, with reduced remission rate and shorter overall survival upon treatment with intensive induction chemotherapy. Functional analyses revealed that Mito-AML is metabolically wired towards stronger complex Idependent respiration and is more responsive to treatment with the BCL2-inhibitor venetoclax.
2022-03-08 | PXD028007 | Pride
Project description:Reversing gene expression signatures in relapsed patient may restore chemosensitivity. We demonstrate that the histone deacetylase inhibitor vorinostat not only reprograms the aberrant gene expression profile of relapsed blasts but is synergistic when applied prior to chemotherapy in primary patient samples and leukemia cell lines
2012-06-12 | GSE34880 | GEO
Project description:Background. Genome-wide expression changes are associated with development of chemoresistance in patients with ovarian cancer (OVCA); the BCL2 antagonist of cell death (BAD) apoptosis pathway may play a role in clinical outcome. Methods. We analyzed specimens and/or genomic data from 1,406 patients and 116 cancer cell lines. Genome-wide expression changes and cisplatin-resistance were evaluated in OVCA cell lines subjected to a total of 144 (cisplatin)-treatment/recovery cycles. Pathway analysis was performed on genes associated with increasing cisplatin-resistance. BAD protein phosphorylation was studied in patient samples and cell lines, and small interfering RNAs (siRNA) used to explore the pathway as a therapeutic target. We evaluated the influence of BAD-pathway expression on chemosensitivity and/or clinical outcome using genomic data from 60 human cancer cell lines and ovarian, breast, colon, and brain cancers from 1,258 patients. Results. The BAD pathway was associated with evolution of OVCA cell line cisplatin-resistance (P<0.001) and resistance of 7 human cancer cell types to 8 cytotoxic agents (P<0.05). OVCA chemoresistance was associated with BAD protein phosphorylation, and targeted siRNA modulation produced corresponding changes in chemosensitivity. Expression of a 47-gene BAD-pathway signature was associated with survival of 1,258 patients with ovarian, breast, colon, and brain cancer. The OVCA BAD-pathway signature survival advantage was independent of surgical cytoreductive status. Conclusions. The BAD apoptosis pathway influences the sensitivity of human cancers to a variety of chemotherapies, likely via modulation of BAD-phosphorylation. The pathway has clinical relevance as a potential biomarker of therapeutic response, patient survival, and as a promising therapeutic target. Twenty-eight (28) advanced-stage serous epithelial ovarian cancers were resected at the time of primary surgery from patients who would receive platinum-based therapy. The tumors were arrayed on Affymetrix HG-U133A GeneChips. The samples were analyzed with respect to the BAD pathway for correlation to overall survival and cisplatin response.
2011-10-02 | E-GEOD-23554 | biostudies-arrayexpress
Project description:Reversing gene expression signatures in relapsed patient may restore chemosensitivity. We demonstrate that the histone deacetylase inhibitor vorinostat not only reprograms the aberrant gene expression profile of relapsed blasts but is synergistic when applied prior to chemotherapy in primary patient samples and leukemia cell lines Primary patient samples were collected from patients treated at the New York University Medical Center and from the Childrenâs Oncology Group (COG) cell bank,RNA was isolated from three primary patient samples and three B-lineage leukemia cell lines with or without treatment with vorinostat for 24 hours.
2012-06-11 | E-GEOD-34880 | biostudies-arrayexpress
Project description:Patient-derived xenograft (PDX) models are commonly used for preclinical evaluation of targeted therapies. It is important to consider the fidelity with which these systems recapitulate the patient disease state. Currently, there is little information regarding how well pediatric AML PDXs mimic the global gene expression found in patients. Here we analyzed RNAseq data from a diverse series of high-risk pediatric AML PDXs, separately and compared to primary patient data. Unsupervised clustering of PDX data resulted in segregation according to KMT2A (MLL) status. Combined analysis showed PDX samples aligned with patient samples harboring similar genetics. Among KMT2A rearranged samples, we observed strong correlation of expression levels of nearly all expressed transcripts. Furthermore, matched patient/PDX pairs showed strong concordance, suggesting retention of sample-specific gene expression. Interestingly, our analysis uncovered previously unidentified cryptic CBFA2T3-GLIS2 rearrangement in two PDX models. Based on high BCL2 mRNA in these models, we tested the efficacy of venetoclax in combination with chemotherapy. While standard daunorubicin/ara-C treatment failed to produce benefits, CPX-351 decreased disease burden and prolonged survival, particularly when combined with venetoclax. These results validate PDX modeling of high-risk pediatric AML and highlight this system's utility for pre-clinical therapeutic discovery, especially for rare subtypes of disease.
2025-01-09 | GSE252945 | GEO
Project description:Background. Genome-wide expression changes are associated with development of chemoresistance in patients with ovarian cancer (OVCA); the BCL2 antagonist of cell death (BAD) apoptosis pathway may play a role in clinical outcome. Methods. We analyzed specimens and/or genomic data from 1,406 patients and 116 cancer cell lines. Genome-wide expression changes and cisplatin-resistance were evaluated in OVCA cell lines subjected to a total of 144 (cisplatin)-treatment/recovery cycles. Pathway analysis was performed on genes associated with increasing cisplatin-resistance. BAD protein phosphorylation was studied in patient samples and cell lines, and small interfering RNAs (siRNA) used to explore the pathway as a therapeutic target. We evaluated the influence of BAD-pathway expression on chemosensitivity and/or clinical outcome using genomic data from 60 human cancer cell lines and ovarian, breast, colon, and brain cancers from 1,258 patients. Results. The BAD pathway was associated with evolution of OVCA cell line cisplatin-resistance (P<0.001) and resistance of 7 human cancer cell types to 8 cytotoxic agents (P<0.05). OVCA chemoresistance was associated with BAD protein phosphorylation, and targeted siRNA modulation produced corresponding changes in chemosensitivity. Expression of a 47-gene BAD-pathway signature was associated with survival of 1,258 patients with ovarian, breast, colon, and brain cancer. The OVCA BAD-pathway signature survival advantage was independent of surgical cytoreductive status. Conclusions. The BAD apoptosis pathway influences the sensitivity of human cancers to a variety of chemotherapies, likely via modulation of BAD-phosphorylation. The pathway has clinical relevance as a potential biomarker of therapeutic response, patient survival, and as a promising therapeutic target.
2011-10-03 | GSE23554 | GEO
Project description:Claudin-low tumors are a highly aggressive breast cancer subtype with no targeted treatments and a clinically documented resistance to chemotherapy. They are significantly enriched in cancer stem cells (CSCs), which makes claudin-low tumor models particularly attractive for studying CSC behavior and developing novel approaches to minimize CSC therapy resistance. One proposed mechanism by which CSCs arise is via an epithelial-mesenchymal transition (EMT), and reversal of this process may provide a potential therapeutic approach for increasing tumor chemosensitivity. Therefore, we investigated the role of the miR-200 family of microRNAs in regulating the epithelial state, stem-like properties, and therapeutic response in an in vivo primary, syngeneic p53null claudin-low tumor model that is normally deficient in miR-200 expression. Using an inducible lentiviral approach, we expressed the miR-200c cluster in this claudin-low model and found that it changed the epithelial state, and consequently, impeded CSC behavior in these mesenchymal tumors. Moreover, these state changes were accompanied by a decrease in proliferation and an increase in the differentiation status. MiR-200c expression also forced a significant reorganization of tumor architecture, affecting important cellular processes involved in cell-cell contact, cell adhesion, and motility. Accordingly, induced miR200c expression also significantly enhanced the chemosensitivity and decreased the metastatic potential of this p53null claudin-low tumor model. Collectively, our data suggest that miR-200c expression in claudin-low tumors offers a potential therapeutic application to disrupt the EMT program on multiple fronts in this mesenchymal tumor subtype, by altering tumor growth, chemosensitivity, and metastatic potential in vivo. reference x sample
2015-06-22 | E-GEOD-62230 | biostudies-arrayexpress
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