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PARP1 association with chromatin non-resistant and doxorubicin-resistant MDA-MB-231

ABSTRACT: Despite advances in cancer therapy, drug resistance remains a major obstacle in a range of cancer types, often driven by overexpression of ATP-binding cassette (ABC) transporters that restrict intracellular drug accumulation. Our previous studies identified the BRG1-p300 transcriptional complex at the promoters of specific ABC transporter genes. We used basal and induced doxorubicin-resistant triple-negative breast cancer (TNBC) cell lines to analyze changes in ABC transporter expression and drug accumulation following PARP1 inhibition. Moreover, the effect of commonly used antioxidants on the repressive effect of Veliparib against ABC genes was verified. ChIP-Seq was performed to identify transcription factor mediating PARP1-dependent ABC gene regulation. PARP1 inhibition or silencing of PARP1/HPF1 complex components downregulated ABCC and ABCG2 transporters, leading to increased intracellular accumulation of chemotherapeutic drugs in doxorubicin-resistant cells. Notably, suppression of genotoxic stress via antioxidant treatment reverses the inhibitory effect of Veliparib on ABC transporter expression. We identified SMARCA1 as a key regulator of PARP1-dependent expression of ABCC genes. SMARCA1 is a key effector of PARP1/p300-mediated regulation of ABC transporters and represents a potential therapeutic target in doxorubicin-resistant TNBC. These findings support the development of combinatorial strategies involving PARP1 inhibitors and chromatin remodeling modulators in refractory breast cancers.

ORGANISM(S): Homo sapiens

PROVIDER: GSE312254 | GEO | 2025/12/04

REPOSITORIES: GEO

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Project description:Krohn2011 - Cerebral amyloid-β proteostasis regulated by membrane transport protein ABCC1 This model is described in the article: Cerebral amyloid-β proteostasis is regulated by the membrane transport protein ABCC1 in mice. Krohn M, Lange C, Hofrichter J, Scheffler K, Stenzel J, Steffen J, Schumacher T, Brüning T, Plath AS, Alfen F, Schmidt A, Winter F, Rateitschak K, Wree A, Gsponer J, Walker LC, Pahnke J. J. Clin. Invest. 2011 Oct; 121(10): 3924-3931 Abstract: In Alzheimer disease (AD), the intracerebral accumulation of amyloid-β (Aβ) peptides is a critical yet poorly understood process. Aβ clearance via the blood-brain barrier is reduced by approximately 30% in AD patients, but the underlying mechanisms remain elusive. ABC transporters have been implicated in the regulation of Aβ levels in the brain. Using a mouse model of AD in which the animals were further genetically modified to lack specific ABC transporters, here we have shown that the transporter ABCC1 has an important role in cerebral Aβ clearance and accumulation. Deficiency of ABCC1 substantially increased cerebral Aβ levels without altering the expression of most enzymes that would favor the production of Aβ from the Aβ precursor protein. In contrast, activation of ABCC1 using thiethylperazine (a drug approved by the FDA to relieve nausea and vomiting) markedly reduced Aβ load in a mouse model of AD expressing ABCC1 but not in such mice lacking ABCC1. Thus, by altering the temporal aggregation profile of Aβ, pharmacological activation of ABC transporters could impede the neurodegenerative cascade that culminates in the dementia of AD. This model is hosted on BioModels Database and identified by: BIOMD0000000618. To cite BioModels Database, please use: BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

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PARP1 association with chromatin non-resistant and doxorubicin-resistant MDA-MB-231

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