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Counteraction of myocardial ferritin heavy chain deficiency by heme oxygenase-1

ABSTRACT: Counteraction of myocardial ferritin heavy chain deficiency by heme oxygenase-1

PROVIDER: PRJNA856316 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20006134.fastq.gz	Fastqsanger.gz
	SRR20006135.fastq.gz	Fastqsanger.gz
	SRR20006136.fastq.gz	Fastqsanger.gz
	SRR20006137.fastq.gz	Fastqsanger.gz
	SRR20006138.fastq.gz	Fastqsanger.gz

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Counteraction of myocardial ferritin heavy chain deficiency by heme oxygenase-1

Project description:To investigate the functional significance of myocardial ferritin heavy chain (FtH) in a model of acute myocardial infarction (MI). FtH was deleted using FtH floxed mice and Sm-22 Cre mice on a C57/bl6 background At 3 hours following 45 minutes of ischemia induced via ligation of left ant. decsending coronary artery, ischemic regions were identified, dissected, and total RNA was isolated fand gene expression profiling analysis using data obtained from RNA-seq of 3 different animals. RNA Total RNA isolated from left ventricle under homeostatic (bseline conditions) served as negative ctr. (n=3/group)

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Malaria parasites require a divergent heme oxygenase for apicoplast biogenesis

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Heme oxygenase-1 knocked down rat mesangial cells treated with hydrogen peroxide

Project description:HO-1 cells denote the cultured rat mesangial cells with heme oxygenase-1 knocked down by RNA interference (using lentiviral vector). GFP cells denote the cultured rat mesangial cells that are transfected with empty lentiviral vector containing GFP cassette. Cells are treated with hydrogen peroxide 100 micromolar for 2 hours, or without. RNA are then harvested for array analysis. Biological replicates are performed (two independent experiment sets). GFP cell and HO-1 cell are untreated, or treated with hydrogen peroxide (100 micromolar for 2 hours).

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The heme regulatory motifs of heme oxygenase-2 function to transfer heme to the catalytic site for degradation

Project description:Heme regulatory motifs (HRMs) are found in a variety of proteins that are involved in diverse biological functions. In the C-terminal tail region of human heme oxygenase-2 (HO2), there are two HRMs whose cysteines form a disulfide bond; when reduced, these cysteines are available to bind Fe3+-heme. Heme binding to the HRMs is independent of the HO2 catalytic active site in the core of the protein, where heme binds with high affinity and is degraded to biliverdin. Here, we describe the reversible, protein-mediated transfer of heme between the HRMs and the core of HO2. Using HDX-MS to monitor the dynamics of HO2 with and without Fe3+-heme bound to the HRMs and to the core, we detected conformational changes in the catalytic core only in one state of the catalytic cycle – when Fe3+-heme is bound to the HRMs and the core is in the apo state. The conformational changes detected are consistent with transfer of heme between binding sites. Indeed, Fe3+-heme bound to the HRMs is transferred to the apo-core upon either independently expressing the core and a construct spanning the HRM-containing tail or after single turnover of heme at the core. In addition, we observed transfer of heme from the core to the HRMs and equilibration of heme between the core and HRMs. We thus propose a Fe3+-heme transfer model in which heme bound to the HRMs is readily transferred to the catalytic site for degradation to facilitate turnover but can also equilibrate between the sites to maintain heme homeostasis.

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Heme oxygenase-1 knocked down rat mesangial cells treated with hydrogen peroxide

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Heme oxygenase-1 orchestrates the immunosuppressive program of tumor-associated macrophages [RNA-Seq]

Project description:Tumor-Associated Macrophages (TAMs) contribute to the maintenance of a strong immunosuppressive environment, supporting tumor progression and resistance to treatment. To date, the mechanisms that drive acquisition of these immunosuppressive features are still poorly defined. Heme oxygenase-1 (HO-1) is the rate-limiting enzyme that catabolizes free heme. It displays important cytoprotective, anti-inflammatory and antioxidant properties. A growing body of evidence suggests that HO-1 may also promote tumor development. Herein, we show that HO-1 is highly expressed in monocytic cells in the tumor microenvironment (TME) once they differentiate into TAMs. Deletion of HO-1 in the myeloid compartment enhances the beneficial effects of a therapeutic antitumor vaccine by restoring CD8 T-cell proliferation and cytotoxicity. We further show that induction of HO-1 plays a major role on monocyte education by tumor cells by modulating their transcriptional and epigenetic programs. These results identify HO-1 as a valuable therapeutic target to reprogram the TME and synergize with current cancer therapies to facilitate antitumoral response.

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Project description:Acute kidney injury (AKI) is a major public health concern with significant attributable morbidity and mortality with no current FDA approved treatments other than supportive care through dialysis. Several pre-clinical studies have suggested that heme-oxygenase-1 (HO-1), an enzyme that catalyzes the breakdown of heme, has promise as a potential therapeutic target for AKI. Clinical trials involving HO-1 products (biliverdin, carbon monoxide, and iron), however, have not progressed beyond the Phase 1/2 level. We have identified small molecule inducers of HO-1 that enable us to exploit the full therapeutic potential of HO-1, the combination of its products, and as-yet-undefined effects of the enzyme system. Through cell-based, high throughput screens for induction of HO-1 through the human HO-1 promoter/enhancer, we identified two novel small molecules and broxaldine, an FDA approved antiprotozoal, for further consideration as candidate compounds exhibiting Emax ≥ 70% of 5 µM hemin and EC50<10 µM. RNA sequencing identified shared binding motifs to NRF-2, a transcription factor known to regulate antioxidant genes, including HO-1. siRNA knockdown of NRF-2 confirmed the role of NRF-2 in induction of HO-1. In vitro, cytoprotective function of the candidates was assessed against cisplatin-induced cytotoxicity and apoptosis. In vivo, delivery of candidate compounds induced HO-1 expression in the kidneys of mice. This study serves as the basis for further development of small molecule HO-1 inducers as preventative or therapeutic interventions for a variety of pathologies, including AKI.

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