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https://www.readbyqxmd.com/read/27829220/gene-expression-profile-induced-by-arsenic-trioxide-in-chronic-lymphocytic-leukemia-cells-reveals-a-central-role-for-heme-oxygenase-1-in-apoptosis-and-regulation-of-matrix-metalloproteinase-9
#1
Irene Amigo-Jiménez, Elvira Bailón, Noemí Aguilera-Montilla, José A García-Marco, Angeles García-Pardo
CLL remains an incurable disease in spite of the many new compounds being tested. Arsenic trioxide (ATO) induces apoptosis in all CLL cell types and could constitute an efficient therapy. To further explore this, we have studied the gene expression profile induced by ATO in CLL cells. ATO modulated many genes, largely involved in oxidative stress, being HMOX1 the most upregulated gene, also induced at the protein level. ATO also increased MMP-9, as we previously observed, both at the mRNA and protein level...
November 4, 2016: Oncotarget
https://www.readbyqxmd.com/read/27829164/molecular-effects-of-1-naphthyl-methylcarbamate-and-solar-radiation-exposures-on-human-melanocytes
#2
Bianca Ferrucio, Manoela Tiago, Richard D Fannin, Liwen Liu, Kevin Gerrish, Silvya Stuchi Maria-Engler, Richard S Paules, Silvia Berlanga de Moraes Barros
Carbaryl (1-naphthyl-methylcarbamate), a broad-spectrum insecticide, has recently been associated with the development of cutaneous melanoma in an epidemiological cohort study with U.S. farm workers also exposed to ultraviolet radiation, the main etiologic factor for skin carcinogenesis. We hypothesized that carbaryl exposure may increase deleterious effects of UV solar radiation on skin melanocytes. This study aimed to characterize human melanocytes after individual or combined exposure to carbaryl (100μM) and solar radiation (375mJ/cm(2))...
November 6, 2016: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/27803663/environmental-enrichment-modified-epigenetic-mechanisms-in-samp8-mouse-hippocampus-by-reducing-oxidative-stress-and-inflammaging-and-achieving-neuroprotection
#3
Christian Griñan-Ferré, Dolors Puigoriol-Illamola, Verónica Palomera-Ávalos, David Pérez-Cáceres, Júlia Companys-Alemany, Antonio Camins, Daniel Ortuño-Sahagún, M Teresa Rodrigo, Mercè Pallàs
With the increase in life expectancy, aging and age-related cognitive impairments are becoming one of the most important issues for human health. At the same time, it has been shown that epigenetic mechanisms are emerging as universally important factors in life expectancy. The Senescence Accelerated Mouse P8 (SAMP8) strain exhibits age-related deterioration evidenced in learning and memory abilities and is a useful model of neurodegenerative disease. In SAMP8, Environmental Enrichment (EE) increased DNA-methylation levels (5-mC) and reduced hydroxymethylation levels (5-hmC), as well as increased histone H3 and H4 acetylation levels...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27789968/reduction-of-facial-wrinkles-by-hydrolyzed-water-soluble-egg-membrane-associated-with-reduction-of-free-radical-stress-and-support-of-matrix-production-by-dermal-fibroblasts
#4
Gitte S Jensen, Bijal Shah, Robert Holtz, Ashok Patel, Donald C Lo
OBJECTIVE: The aim of this study was to evaluate the effects of water-soluble egg membrane (WSEM) on wrinkle reduction in a clinical pilot study and to elucidate specific mechanisms of action using primary human immune and dermal cell-based bioassays. METHODS: To evaluate the effects of topical application of WSEM (8%) on human skin, an open-label 8-week study was performed involving 20 healthy females between the age of 45 years and 65 years. High-resolution photography and digital analysis were used to evaluate the wrinkle depth in the facial skin areas beside the eye (crow's feet)...
2016: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/27782264/metal-homeostasis-disruption-and-mitochondrial-dysfunction-in-hepatocytes-exposed-to-sub-toxic-doses-of-zinc-oxide-nanoparticles
#5
M Chevallet, B Gallet, A Fuchs, P H Jouneau, K Um, E Mintz, I Michaud-Soret
Increased production and use of zinc oxide nanoparticles (ZnO-NPs) in consumer products has prompted the scientific community to investigate their potential toxicity, and understand their impact on the environment and organisms. Molecular mechanisms involved in ZnO-NP toxicity are still under debate and focus essentially on high dose expositions. In our study, we chose to evaluate the effect of sub-toxic doses of ZnO-NPs on human hepatocytes (HepG2) with a focus on metal homeostasis and redox balance disruptions...
October 26, 2016: Nanoscale
https://www.readbyqxmd.com/read/27778153/phenotypic-characterization-of-a-novel-ho-1-depletion-model-in-the-rat
#6
Vassilios Atsaves, Maria G Detsika, Elpida Poulaki, Hara Gakiopoulou, Elias A Lianos
Although the protective role of HO-1 induction in various forms of kidney disease is well established, mechanisms other than heme catabolism to biliverdin, bilirubin and carbon monoxide have recently been identified. Unraveling these mechanisms requires the generation of appropriate animal models. The present study describes the generation of a HO-1 deficient Hmox1 (-/-) rat model and characterizes its renal and extrarenal phenotype. Hmox1 (-/-) rats had growth retardation and splenomegaly compared to their Hmox1 (+/+) littermates...
October 24, 2016: Transgenic Research
https://www.readbyqxmd.com/read/27760386/spatiotemporal-expression-and-transcriptional-regulation-of-heme-oxygenase-and-biliverdin-reductase-genes-in-zebrafish-danio-rerio-suggest-novel-roles-during-early-developmental-periods-of-heightened-oxidative-stress
#7
Andrew Holowiecki, Britton O'Shields, Matthew J Jenny
Heme oxygenase 1 (HMOX1) degrades heme into biliverdin, which is subsequently converted to bilirubin by biliverdin reductase (BVRa or BVRb) in a manner analogous to the classic anti-oxidant glutathione-recycling pathway. To gain a better understanding of the potential antioxidant roles the BVR enzymes may play during development, the spatiotemporal expression and transcriptional regulation of zebrafish hmox1a, bvra and bvrb were characterized under basal conditions and in response to pro-oxidant exposure. All three genes displayed spatiotemporal expression patterns consistent with classic hematopoietic progenitors during development...
October 17, 2016: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/27746196/influence-of-sex-and-developmental-stage-on-acute-hepatotoxic-and-inflammatory-responses-to-liver-procarcinogens-in-the-mouse
#8
Daniel Hanna, Ariane Emami Riedmaier, Kim S Sugamori, Denis M Grant
The incidence of liver cancer is higher in men than in women. This sex difference is also observed in murine tumor induction models that result in the appearance of liver tumors in adult mice following their exposure on postnatal days 8 and/or 15 to carcinogens such as 4-aminobiphenyl (ABP) or diethylnitrosamine (DEN). Previous studies performed in adult mice showed that acute hepatotoxic and inflammatory responses to high-dose DEN exposure were greater in males than in females, leading to the suggestion that these responses could account for the sex difference in tumor development...
October 13, 2016: Toxicology
https://www.readbyqxmd.com/read/27740521/predictive-role-blvra-mrna-expression-in-hepatocellular-cancer
#9
Kristy Na Kubícková, Iva Subhanová, Renáta Konícková, Linda Matousová, Petr Urbánek, Hana Parobková, Martin Kupec, Jirí Pudil, Libor Vítek
:  Introduction and aim. Hepatocellular carcinoma (HCC) is the most common primary malignant liver tumor. It is primarily caused by hepatic cirrhosis or chronic viral hepatitis. Hepatic carcinogenesis is associated with increased oxidative stress. Thus, the aim of our study was to assess expression of the genes involved in the homeostasis of oxidative stress in patients with HCC. MATERIAL AND METHODS: The study was performed on 32 patients with primary HCC (verified by liver histology in 29 patients) and 27 control subjects (in 11 subjects, liver histology was available either with no or minimal changes in the liver tissue)...
November 2016: Annals of Hepatology
https://www.readbyqxmd.com/read/27734935/effects-of-aged-garlic-extract-and-fruarg-on-gene-expression-and-signaling-pathways-in-lipopolysaccharide-activated-microglial-cells
#10
Hailong Song, Yuan Lu, Zhe Qu, Valeri V Mossine, Matthew B Martin, Jie Hou, Jiankun Cui, Brenda A Peculis, Thomas P Mawhinney, Jianlin Cheng, C Michael Greenlief, Kevin Fritsche, Francis J Schmidt, Ronald B Walter, Dennis B Lubahn, Grace Y Sun, Zezong Gu
Aged garlic extract (AGE) is widely used as a dietary supplement on account of its protective effects against oxidative stress and inflammation. But less is known about specific molecular targets of AGE and its bioactive components, including N-α-(1-deoxy-D-fructos-1-yl)-L-arginine (FruArg). Our recent study showed that both AGE and FruArg significantly attenuate lipopolysaccharide (LPS)-induced neuroinflammatory responses in BV-2 microglial cells. This study aims to unveil effects of AGE and FruArg on gene expression regulation in LPS stimulated BV-2 cells...
October 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27671773/characterization-of-heme-oxygenase-and-biliverdin-reductase-gene-expression-in-zebrafish-danio-rerio-basal-expression-and-response-to-pro-oxidant-exposures
#11
Andrew Holowiecki, Britton O'Shields, Matthew J Jenny
While heme is an important cofactor for numerous proteins, it is highly toxic in its unbound form and can perpetuate the formation of reactive oxygen species. Heme oxygenase enzymes (HMOX1 and HMOX2) degrade heme into biliverdin and carbon monoxide, with biliverdin subsequently being converted to bilirubin by biliverdin reductase (BVRa or BVRb). As a result of the teleost-specific genome duplication event, zebrafish have paralogs of hmox1 (hmox1a and hmox1b) and hmox2 (hmox2a and hmox2b). Expression of all four hmox paralogs and two bvr isoforms were measured in adult tissues (gill, brain and liver) and sexually dimorphic differences were observed, most notably in the basal expression of hmox1a, hmox2a, hmox2b and bvrb in liver samples...
November 15, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/27662796/heme-oxygenase-1-up-regulates-glomerular-decay-accelerating-factor-expression-and-minimizes-complement-deposition-and-injury
#12
Maria G Detsika, Pu Duann, Vassilios Atsaves, Apostolos Papalois, Elias A Lianos
Complement-activation controllers, including decay accelerating factor (DAF), are gaining emphasis as they minimize injury in various dysregulated complement-activation disorders, including glomerulopathies. Heme oxygenase (HO)-1 overexpression or induction has been shown to attenuate injury in complement-dependent models of glomerulonephritis. This study investigated whether up-regulation of DAF by heme oxygenase 1 (HO-1) is an underlying mechanism by using Hmox-1-deficient rats (Hmox1(+/-); Hmox1(-/-)) or rats with Hmox-1 overexpression targeted to glomerular epithelial cells (GEC(Hmox-1)), which are particularly vulnerable to complement-mediated injury owing to their terminally differentiated nature...
September 20, 2016: American Journal of Pathology
https://www.readbyqxmd.com/read/27634590/proteomic-analysis-of-acetaminophen-induced-hepatotoxicity-and-identification-of-heme-oxygenase-1-as-a-potential-plasma-biomarker-of-liver-injury
#13
Yuan Gao, Zhijun Cao, Xi Yang, Mohamed A Abdelmegeed, Jinchun Sun, Si Chen, Richard D Beger, Kelly Davis, William F Salminen, Byoung-Joon Song, Donna L Mendrick, Li-Rong Yu
Overdose of acetaminophen (APAP) is a major cause of acute liver failure. To identify pathways related to hepatotoxicity and potential biomarkers of liver injury, a proteomic approach of (16) O/(18) O labeling and 2D-LC-MS/MS was used to analyze liver tissues from rats at 6 and 24 h post-treatment with low (100 mg/kg) and high (1250 mg/kg) doses of APAP. The analysis revealed that molecular pathways evolved progressively from scattered and less significant perturbations to more focused and significant alterations in a dose- and time-dependent manner...
September 16, 2016: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/27621283/cadmium-exposure-differentially-alters-odorant-driven-behaviors-and-expression-of-olfactory-receptors-in-juvenile-coho-salmon-oncorhynchus-kisutch
#14
Chase R Williams, James W MacDonald, Theo K Bammler, Michael H Paulsen, Christopher D Simpson, Evan P Gallagher
Salmon exposed to waterborne metals can experience olfactory impairment leading to disrupted chemosensation. In the current study, we investigated the effects of cadmium (Cd) on salmon olfactory function by modeling an exposure scenario where juvenile salmon transiently migrate through a polluted waterway. Coho were exposed to environmentally-relevant concentrations of waterborne Cd (2 and 30 μg/L) for 48 hrs and (0.3 and 2 μg/L) for 16 days, followed by a 16-day depuration associated with outmigration. Cadmium exposures inhibited behavioral responses towards L-cysteine and conspecific odorants, with effects persisting following the depuration...
September 11, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/27618864/heme-oxygenase-1-mediated-neuroprotection-in-subarachnoid-hemorrhage-via-intracerebroventricular-deferoxamine
#15
Robert H LeBlanc, Ruiya Chen, Magdy H Selim, Khalid A Hanafy
BACKGROUND: Subarachnoid hemorrhage (SAH) is a devastating disease that affects over 30,000 Americans per year. Previous animal studies have explored the therapeutic effects of deferoxamine (DFX) via its iron-chelating properties after SAH, but none have assessed the necessity of microglial/macrophage heme oxygenase-1 (HO-1 or Hmox1) in DFX neuroprotection, nor has the efficacy of an intracerebroventricular (ICV) administration route been fully examined. We explored the therapeutic efficacy of systemic and ICV DFX in a SAH mouse model and its effect on microglial/macrophage HO-1...
September 13, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27604527/heme-oxygenases-in-cardiovascular-health-and-disease
#16
REVIEW
Anita Ayer, Abolfazl Zarjou, Anupam Agarwal, Roland Stocker
Heme oxygenases are composed of two isozymes, Hmox1 and Hmox2, that catalyze the degradation of heme to carbon monoxide (CO), ferrous iron, and biliverdin, the latter of which is subsequently converted to bilirubin. While initially considered to be waste products, CO and biliverdin/bilirubin have been shown over the last 20 years to modulate key cellular processes, such as inflammation, cell proliferation, and apoptosis, as well as antioxidant defense. This shift in paradigm has led to the importance of heme oxygenases and their products in cell physiology now being well accepted...
October 2016: Physiological Reviews
https://www.readbyqxmd.com/read/27584680/lead-related-genetic-loci-cumulative-lead-exposure-and-incident-coronary-heart-disease-the-normative-aging-study
#17
Ning Ding, Xin Wang, Marc G Weisskopf, David Sparrow, Joel Schwartz, Howard Hu, Sung Kyun Park
BACKGROUND: Cumulative exposure to lead is associated with cardiovascular outcomes. Polymorphisms in the δ-aminolevulinic acid dehydratase (ALAD), hemochromatosis (HFE), heme oxygenase-1 (HMOX1), vitamin D receptor (VDR), glutathione S-transferase (GST) supergene family (GSTP1, GSTT1, GSTM1), apolipoprotein E (APOE),angiotensin II receptor-1 (AGTR1) and angiotensinogen (AGT) genes, are believed to alter toxicokinetics and/or toxicodynamics of lead. OBJECTIVES: We assessed possible effect modification by genetic polymorphisms in ALAD, HFE, HMOX1, VDR, GSTP1, GSTT1, GSTM1, APOE, AGTR1 and AGT individually and as the genetic risk score (GRS) on the association between cumulative lead exposure and incident coronary heart disease (CHD) events...
2016: PloS One
https://www.readbyqxmd.com/read/27582105/nrf2-akt-interactions-regulate-heme-oxygenase-1-expression-in-kidney-epithelia-during-hypoxia-and-hypoxia-reoxygenation
#18
Haranatha R Potteti, Chandramohan R Tamatam, Rakesh Marreddy, Narsa M Reddy, Sanjeev Noel, Hamid Rabb, Sekhar P Reddy
Ischemia-reperfusion (IR)-induced kidney injury is a major clinical problem, but its underlying mechanisms remain unclear. The transcription factor known as nuclear factor, erythroid 2-like 2 (NFE2L2 or Nrf2) is crucial for protection against oxidative stress generated by pro-oxidant insults. We have previously shown that Nrf2 deficiency enhances susceptibility to IR-induced kidney injury in mice and that its upregulation is protective. Here, we examined Nrf2 target antioxidant gene expression and the mechanisms of its activation in both human and murine kidney epithelia following acute (2 h) and chronic (12 h) hypoxia and reoxygenation conditions...
November 1, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27562971/metabolic-reprogramming-regulates-the-proliferative-and-inflammatory-phenotype-of-adventitial-fibroblasts-in-pulmonary-hypertension-through-the-transcriptional-corepressor-c-terminal-binding-protein-1
#19
Min Li, Suzette Riddle, Hui Zhang, Angelo D'Alessandro, Amanda Flockton, Natalie J Serkova, Kirk C Hansen, Radu Moldvan, B Alexandre McKeon, Maria Frid, Sushil Kumar, Hong Li, Hongbing Liu, Angela Caánovas, Juan F Medrano, Milton G Thomas, Dijana Iloska, Lydie Plecitá-Hlavatá, Petr Ježek, Soni Pullamsetti, Mehdi A Fini, Karim C El Kasmi, QingHong Zhang, Kurt R Stenmark
BACKGROUND: Changes in metabolism have been suggested to contribute to the aberrant phenotype of vascular wall cells, including fibroblasts, in pulmonary hypertension (PH). Here, we test the hypothesis that metabolic reprogramming to aerobic glycolysis is a critical adaptation of fibroblasts in the hypertensive vessel wall that drives proliferative and proinflammatory activation through a mechanism involving increased activity of the NADH-sensitive transcriptional corepressor C-terminal binding protein 1 (CtBP1)...
October 11, 2016: Circulation
https://www.readbyqxmd.com/read/27537261/increased-frataxin-levels-protect-retinal-ganglion-cells-after-acute-ischemia-reperfusion-in-the-mouse-retina-in-vivo
#20
Rowena Schultz, Otto W Witte, Christian Schmeer
PURPOSE: The mitochondrial protein frataxin (FXN) is highly expressed in metabolically active tissues and has been shown to improve cell survival in response to oxidative stress after ischemia. Retinal ischemia/hypoxia is a complication of ocular diseases such as diabetic retinopathy and glaucoma. There are no effective therapeutic approaches currently available. This study was performed to evaluate the neuroprotective effects of FXN after acute retinal ischemia/reperfusion in vivo. METHODS: Retinal ischemia/reperfusion was induced in adult wild-type and FXN-overexpressing mice by transient elevation of intraocular pressure (IOP) for 45 minutes...
August 1, 2016: Investigative Ophthalmology & Visual Science
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