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Role of growth plate Nox2 in alcoholic osteopenia

ABSTRACT: To study the role of Nox2 in ethanol toxicity on the bone growth plate chondrocytes, we generated Nox2 conditional knockout mice (CKO), in which the catalytic subunit of Nox2, Cybb, is deleted in chondrocytes using a Cre-lox system, where Cre is expressed from the Col2a1 promoter. CKO mice and floxed control mice were fed an ethanol-containing Lieber De-Carli-based diet or pair-fed a control diet for 8 weeks starting at 5-6 weeks of age. As both the Nox2 genotype and ethanol diminished the number of chondrocytes in the growth plates, we conducted an RNA-Seq analysis of the growth-plate containing regions of the femurs.

ORGANISM(S): Mus musculus

PROVIDER: GSE234176 | GEO | 2024/05/24

REPOSITORIES: GEO

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Modulation of NOX2 causes Obesity- Mediated Atrial Fibrillation

Project description:Obesity is linked to an increased risk of atrial fibrillation (AF) via increased oxidative stress. While NADPH oxidase II (NOX2), a major source of oxidative stress and reactive oxygen species (ROS) in the heart predisposes to AF, the underlying mechanisms remain unclear. Here, we studied NOX2-mediated ROS production in obesity-mediated AF using Nox2-knock-out (KO) mice and mature human induced pluripotent stem cell-derived atrial cardiomyocytes (hiPSC-aCMs). Diet-induced obesity (DIO) mice and hiPSC-aCMs treated with palmitic acid (PA) were infused with a NOX blocker (apocynin) and a NOX2-specific inhibitor, respectively. We showed that NOX2 inhibition normalized atrial action potential duration and abrogated obesity-mediated ion channel remodeling with reduced AF burden. Unbiased transcriptomics analysis revealed that NOX2 mediates atrial remodeling in obesity-mediated AF in DIO mice, PA-treated hiPSC-aCMs, and human atrial tissue from obese individuals by upregulation of paired-like homeodomain transcription factor 2 (PITX2). Furthermore, hiPSC-aCMs treated with hydrogen peroxide, a NOX2 surrogate, displayed increased PITX2 expression, establishing a mechanistic link between increased NOX2-mediated ROS production and modulation of PITX2. Our findings offer insights into possible mechanisms through which obesity triggers AF and support NOX2 inhibition as a potential novel prophylactic or adjunctive therapy for patients with obesity-mediated AF.

2024-10-09 | GSE271748 | GEO

Bronchoalveolar lavage alveolar macrophage subset transcriptomes in WT and NOX2-knockout mice

Project description:The leukocyte NADPH oxidase 2 (NOX2) plays a key role in pathogen killing and immunoregulation. Genetic defects in NOX2 result in chronic granulomatous disease (CGD), associated with microbial infections and inflammatory disorders, often involving the lung. Alveolar macrophages (AM) are the predominant immune cell in the airways at steady state, and limiting their activation is important given constant exposure to inhaled materials, yet the importance of NOX2 in this process is not well-understood. Here, we show a previously undescribed role for NOX2 in maintaining lung homeostasis by suppressing AM activation, as studied using CGD mice or mice with selective loss of NOX2 primarily in macrophages. AM lacking NOX2 have increased cytokine responses to TLR2 and TLR4 stimulation ex vivo. Moreover, between 4 and 12 weeks of age, mice with global NOX2 deletion developed an activated CD11bhigh subset of AM with epigenetic and transcriptional profiles reflecting immune activation compared to WT AM. The presence of CD11bhigh AM in CGD mice correlated with increased numbers of alveolar neutrophils and proinflammatory cytokines at steady state as well as increased lung inflammation following insults. Moreover, deletion of NOX2 primarily in macrophages was sufficient for mice to develop an activated CD11bhigh AM subset and accompanying pro-inflammatory sequela. Additionally, we showed that the altered resident macrophage transcriptional profile in the absence of NOX2 is tissue-specific as these changes were not seen in resident peritoneal macrophages. Thus, these data demonstrate that absence of NOX2 in alveolar macrophages leads to their pro-inflammatory remodeling and dysregulates alveolar homeostasis.

2022-04-03 | GSE198769 | GEO

Quantification of oxidized proteins in wild type and Nox2 deficient mouse dorsal root ganglia

Project description:Here we studied the NOX2 dependent redox-proteome in dorsal root ganglia in mice. The overall goal was to assess the degree of NOX2-dependent changes in oxidised proteins following exposure to enriched enviroment and sciatic nerve axotomy in dorsal root ganglia.

2020-10-13 | PXD018085 | Pride

Effect of chronic ethanol consumption on rat pancreas

Project description:Male Wistar rats weighing 90-120 g were acclimatized for one week and fed standard laboratory chow, at which time the animals were divided into two groups. Animals were then pair-fed for 8 weeks a regular laboratory chow and water “ad libitum” or Lieber-DeCarli diet (36% calories from ethanol). Control animals received the iso-caloric amount of dextrose to replace ethanol. After 8 weeks of differential feeding rats were euthanized, the pancreas immediately dissected and stored at -80?C until RNA isolation. RNA expression was analyzed using Affymetrix RAE230A gene chips Keywords: stress response, disease state analysis

2006-07-01 | GSE3311 | GEO

Transcription profiling of effect of chronic ethanol consumption on Rattus norvegicus pancreas

Project description:Male Wistar rats weighing 90-120 g were acclimatized for one week and fed standard laboratory chow, at which time the animals were divided into two groups. Animals were then pair-fed for 8 weeks a regular laboratory chow and water âad libitumâ or Lieber-DeCarli diet (36% calories from ethanol). Control animals received the iso-caloric amount of dextrose to replace ethanol. After 8 weeks of differential feeding rats were euthanized, the pancreas immediately dissected and stored at -80?C until RNA isolation. RNA expression was analyzed using Affymetrix RAE230A gene chips Experiment Overall Design: pancreas from 3 rats feed control diets and 3 rats feed ethanol diets were analyzed

2007-11-06 | E-GEOD-3311 | biostudies-arrayexpress

Effect of NOX2 (CYBB) knock out on the transcriptome of leukemia stem cells isolated from NUP98/HOXA9+BCR/ABL murine syngeneic leukemia model

Project description:To investigate the function of NOX2 (CYBB) in leukemia stem cells, we created leukemia by tranforming primitive hematopoetic cells isolated from wild type and NOX2-KO mice with NUP98/HOXA9 and BCR/ABL oncogenes, isolated mRNA, and performed RNA-seq experiments to profile transcriptional changes upon NOX2 loss.

2019-03-26 | GSE117657 | GEO

RNA-seq of Runx3 cKO SFZ/DZ chondrocytes.

Project description:Purpose: To demonstrate Runx3's association with organizing the extracellular matrix in SFZ/DZ chondrocytes. Method: RNA samples were collected from SFZ/DZ chondrocytes of 5-day-old Col2a1-Cre;Runx3fl/fl and Runx3fl/fl mice. Results: 18 genes were up- or down-regulated by more than 2-fold in the Runx3 knockout in SFZ. Conclusions: However, genes organizing the extracellular matrix were down-regulated in Runx3 cKO DZ chondrocytes.

2020-09-04 | GSE157433 | GEO

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Project description:Sprague-Dawley rats were placed on an ethanol-containing or pair-fed Lieber and DeCarli diets for 4 wks prior to surgical fracture. Following insertion of a medullary pin, a closed mid-diaphyseal fracture was induced using a Bonnarens and Einhorn fracture device. At 3 days post-fracture, the region of the fracture calluses were harvested from the right hind-limb. RNA was extracted and microarray analysis was conducted against the entire rat genome to study the effects of alcohol-consumption on the fracture healing.

2011-05-01 | GSE16003 | GEO

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2012-11-01 | E-GEOD-41932 | biostudies-arrayexpress

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2024-09-18 | PXD055984 | Pride

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