Genome-wide CRISPR screen reveals tumor-intrinsic responses to radiotherapy
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE236331 | GEO | 2023/07/06
REPOSITORIES: GEO
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Project description:Radiation therapy (RT) remains a vital component of the curative multimodality therapy for many types of cancer including breast cancer (BC) disease. Thus, many efforts from research teams are needed to help clinicians in understanding the molecular portrait of a specific cancer type. Moreover, technological advances in RT are evolving with the use of hadrons, such as protons. However, cell and molecular changes induced by proton exposure are poorly characterized as well as molecular differences induced by high and low Linear Energy Transfer (LET) irradiation modalities, representing a topic of radiobiological interest. We analyze and compare molecular responses, in term of gene expression profile (GEP) changes, induced by conventional and non conventional radiation treatment modalities characterized by different LET values (using electron and proton beams respectively), delivering the same dose of IR, in tumorigenic and non-tumorigenic breast cell lines. We trust that this study could have a role in driving RT towards personalised treatments, evaluating possible combined treatments, based also on the molecular characterization in BC.
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Project description:Breast tumors are characterized into different subtypes based on their surface marker expression, which affects their prognosis and treatment. For example, triple negative breast cancer cells (ER-/PR-/Her2-) show reduced susceptibility towards radiotherapy and chemotherapeutic agents. Poly (ADP-ribose) polymerase (PARP) inhibitors have shown promising results in clinical trials, both as single agents and in combination with other chemotherapeutics, in several subtypes of breast cancer patients. PARP1 is involved in DNA repair, apoptosis, and transcriptional regulation and an understanding of the effects of PARP inhibitors, specifically on metabolism, is currently lacking. Here, we have used NMR-based metabolomics to probe the cell line-specific effects of PARP inhibitor and radiation on metabolism in three distinct breast cancer cell lines. Our data reveal several cell line independent metabolic changes upon PARP inhibition, including an increase in taurine. Pathway enrichment and topology analysis identified that nitrogen metabolism, glycine, serine and threonine metabolism, aminoacyl-tRNA biosynthesis and taurine and hypotaurine metabolism were enriched after PARP inhibition in the three breast cancer cell lines. We observed that the majority of metabolic changes due to radiation as well as PARP inhibition were cell line dependent, highlighting the need to understand how these treatments affect cancer cell response via changes in metabolism. Finally, we observed that both PARP inhibition and radiation induced a similar metabolic response in the HCC1937 (BRCA mutant cell line), but not in MCF-7 and MDAMB231 cells, suggesting that radiation and PARP inhibition share similar interactions with metabolic pathways in BRCA mutant cells. Our study emphasizes the importance of differences in metabolic responses to cancer treatments in different subtypes of cancers.
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Project description:Aberrant expression of microRNAs (miRNAs) is frequently associated with a variety of cancers, including breast cancer. We and others have demonstrated that radiation-induced rat mammary cancer exhibits a characteristic gene expression profile and a random increase in aberrant DNA copy number; however, the role of aberrant miRNA expression is unclear. We performed a microarray analysis of frozen samples of eight mammary cancers induced by gamma-irradiation (2 Gy), eight spontaneous mammary cancers, and seven normal mammary samples. We found that a small set of miRNAs was characteristically overexpressed in radiation-induced cancer. Quantitative RT-PCR analysis confirmed that miR-135b, miR-192, miR-194, and miR-211 were significantly upregulated in radiation-induced mammary cancer compared with spontaneous cancer and normal mammary tissue. The expression of miR-192 and miR-194 also was upregulated in human breast cancer cell lines compared with non-cancer cells. Manipulation of the miR-194 expression level using a synthetic inhibiting RNA produced a small but significant suppression of cell proliferation and upregulation in the expression of several genes that are suggested to act as tumor suppressors in MCF-7 and T47D breast cancer cells. Thus, the induction of rat mammary cancer by radiation involves aberrant expression of miRNAs, which may favor cell proliferation. We performed miRNA microarray analysis on mammary carcinomas in Sprague-Dawley rat to identify radiation-specific miRNA expression patterns compared with spontaneous mammary carcinomas and normal mammary tissues.
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2012-09-06 | E-GEOD-40640 | biostudies-arrayexpress
Project description:Today, Radiation therapy (RT) regimens are often used for many types of cancer including breast cancer (BC) disease. BC is an heterogeneous disease, at both clinical and molecular levels, presenting distinct subtypes associated with different clinical outcomes. This variability response may be caused by some factors linked to radiation or dependent to BC specific features such as tumor stage and hormone receptor (HR) status. We analyze and compare molecular responses, in term of gene expression profile (GEP) changes, induced by 9 and 23Gy of ionizing radiation (IR) in immortalized and primary cell cultures grouped according their Estrogen (ER) and Progesteron (PR) receptors positive or negative expression. Our explorative study gives some comprehensive hallmarks of the effects of the irradiation in BC cells. We trust that this study could have a role in driving RT towards personalised treatments, based also on the molecular characterization in BC.
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Project description:Mitochondrial DNA-depleted human skin fibroblasts (HSF rho0) with suppressed oxidative phosphorylation were characterized by significant changes in the expression of 2100 nuclear genes, encoding numerous protein classes, in NF-kappaB and STAT3 signaling pathways and by decreased activity of the mitochondrial death pathway, compared to the parent rho+ HSF. In contrast, the extrinsic TRAIL/TRAIL-Receptor-mediated death pathway remained highly active, and exogenous TRAIL induced higher levels of apoptosis in rho0 cells compared to rho+ HSF. Global gene expression analysis using microarray and quantitative RT-PCR demonstrated that expression levels of many growth factors and their adaptor proteins (FGF13, HGF, IGFBP4, IGFBP6, IGFL2), cytokines (IL6, IL17B, IL18, IL19, IL28B) and cytokine receptors (IL1R1, IL21R, IL31RA) were substantially decreased after mitochondrial depletion. Some of these genes were targets of NF-kappaB and STAT3, and their protein products could regulate the STAT3 signaling pathway. Alpha-irradiation induced expression of several NF-kappaB/STAT3 target genes, including IL1A, IL1B, IL6, PTGS2/COX2 and MMP12, in rho+ HSF, but this response was substantially decreased in rho0 HSF. Suppression of the IKK-NF-kappaB pathway by the small molecular inhibitor BMS-345541 and of the JAK2-STAT3 pathway by AG490 dramatically increased TRAIL-induced apoptosis in the control and irradiated rho+ HSF. Inhibitory antibodies against IL6, the main activator of JAK2-STAT3 pathway, added into the cell media, also increased TRAIL-induced apoptosis in rho+ HSF. However, NF-kappaB activation was partially lost in mitochondrial DNA-depleted HSF resulting in downregulation of the basal or radiation-induced expression of numerous NF-kappaB targets, further suppressing IL6-JAK2-STAT3, that in concert with NF-kappaB, regulated protection against TRAIL-induced apoptosis. There are 12 total samples, 3 biological replicates each of HSF rho+ and rho0 cells that were not irradiated (control=C) or irradiated (alpha=A). Cells were harvested at 4 hours after treatment.
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