scholarly journals The role of the RB tumour suppressor pathway in oxidative stress responses in the haematopoietic system

2008 ◽  
Vol 8 (10) ◽  
pp. 769-781 ◽  
Author(s):  
Kay F. Macleod
Keyword(s):  
Oxidative Stress ◽  
Stress Responses ◽  
Tumour Suppressor ◽  
Oxidative Stress Responses ◽  
Haematopoietic System

scholarly journals The Transcriptional Response to a Peroxisome Proliferator-activated Receptor α Agonist Includes Increased Expression of Proteome Maintenance Genes

2004 ◽  
Vol 279 (50) ◽  
pp. 52390-52398 ◽  
Author(s):  
Steven P. Anderson ◽  
Paul Howroyd ◽  
Jie Liu ◽  
Xun Qian ◽  
Rainer Bahnemann ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Stress Responses ◽  
Transcriptional Response ◽  
Lipid Homeostasis ◽  
Peroxisome Proliferator ◽  
Wild Type ◽  
Peroxisome Proliferator Activated Receptor ◽  
Proteasomal Genes ◽  
Oxidative Stress Responses

The nuclear receptor peroxisome proliferator-activated receptor α (PPARα), in addition to regulating lipid homeostasis, controls the level of tissue damage after chemical or physical stress. To determine the role of PPARα in oxidative stress responses, we examined damage after exposure to chemicals that increase oxidative stress in wild-type or PPARα-null mice. Primary hepatocytes from wild-type but not PPARα-null mice pretreated with the PPAR pan-agonist WY-14,643 (WY) were protected from damage to cadmium and paraquat. The livers from intact wild-type but not PPARα-null mice were more resistant to damage after carbon tetrachloride treatment. To determine the molecular basis of the protection by PPARα, we identified by transcript profiling genes whose expression was altered by a 7-day exposure to WY in wild-type and PPARα-null mice. Of the 815 genes regulated by WY in wild-type mice (p≤ 0.001; ≥1.5-fold or ≤-1.5-fold), only two genes were regulated similarly by WY in PPARα-null mice. WY increased expression of stress modifier genes that maintain the health of the proteome, including those that prevent protein aggregation (heat stress-inducible chaperones) and eliminate damaged proteins (proteasome components). Although the induction of proteasomal genes significantly overlapped with those regulated by 1,2-dithiole-3-thione, an activator of oxidant-inducible Nrf2, WY increased expression of proteasomal genes independently of Nrf2. Thus, PPARα controls the vast majority of gene expression changes after exposure to WY in the mouse liver and protects the liver from oxidant-induced damage, possibly through regulation of a distinct set of proteome maintenance genes.

The role of a Brugia malayi p38 MAP kinase ortholog (Bm-MPK1) in parasite anti-oxidative stress responses

2011 ◽  
Vol 176 (2) ◽  
pp. 90-97 ◽  
Author(s):  
Akruti Patel ◽  
Agnieszka Nawrocka Chojnowski ◽  
Katie Gaskill ◽  
William De Martini ◽  
Ronald L. Goldberg ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Map Kinase ◽  
Stress Responses ◽  
Brugia Malayi ◽  
P38 Map Kinase ◽  
Oxidative Stress Responses

scholarly journals Intracerebral Hemorrhage, Oxidative Stress, and Antioxidant Therapy

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Xiaochun Duan ◽  
Zunjia Wen ◽  
Haitao Shen ◽  
Meifen Shen ◽  
Gang Chen
Keyword(s):  
Oxidative Stress ◽  
Intracerebral Hemorrhage ◽  
Stress Responses ◽  
Secondary Brain Injury ◽  
Mortality And Morbidity ◽  
Systemic Oxidative Stress ◽  
Preclinical And Clinical Studies ◽  
Apoptosis And Necrosis ◽  
Oxidative Stress Responses

Hemorrhagic stroke is a common and severe neurological disorder and is associated with high rates of mortality and morbidity, especially for intracerebral hemorrhage (ICH). Increasing evidence demonstrates that oxidative stress responses participate in the pathophysiological processes of secondary brain injury (SBI) following ICH. The mechanisms involved in interoperable systems include endoplasmic reticulum (ER) stress, neuronal apoptosis and necrosis, inflammation, and autophagy. In this review, we summarized some promising advances in the field of oxidative stress and ICH, including contained animal and human investigations. We also discussed the role of oxidative stress, systemic oxidative stress responses, and some research of potential therapeutic options aimed at reducing oxidative stress to protect the neuronal function after ICH, focusing on the challenges of translation between preclinical and clinical studies, and potential post-ICH antioxidative therapeutic approaches.

scholarly journals Histone Deacetylase HDA-2 Regulates Trichoderma atroviride Growth, Conidiation, Blue Light Perception, and Oxidative Stress Responses

2016 ◽  
Vol 83 (3) ◽  
Author(s):  
Macario Osorio-Concepción ◽  
Gema Rosa Cristóbal-Mondragón ◽  
Braulio Gutiérrez-Medina ◽  
Sergio Casas-Flores
Keyword(s):  
Oxidative Stress ◽  
Histone Deacetylase ◽  
Blue Light ◽  
Stress Responses ◽  
Wild Type ◽  
Content Type ◽  
Encoding Gene ◽  
Oxidative Stress Responses ◽  
And Oxidative Stress

ABSTRACT Fungal blue-light photoreceptors have been proposed as integrators of light and oxidative stress. However, additional elements participating in the integrative pathway remain to be identified. In Trichoderma atroviride, the blue-light regulator (BLR) proteins BLR-1 and -2 are known to regulate gene transcription, mycelial growth, and asexual development upon illumination, and recent global transcriptional analysis revealed that the histone deacetylase-encoding gene hda-2 is induced by light. Here, by assessing responses to stimuli in wild-type and Δhda-2 backgrounds, we evaluate the role of HDA-2 in the regulation of genes responsive to light and oxidative stress. Δhda-2 strains present reduced growth, misregulation of the con-1 gene, and absence of conidia in response to light and mechanical injury. We found that the expression of hda-2 is BLR-1 dependent and HDA-2 in turn is essential for the transcription of early and late light-responsive genes that include blr-1, indicating a regulatory feedback loop. When subjected to reactive oxygen species (ROS), Δhda-2 mutants display high sensitivity whereas Δblr strains exhibit the opposite phenotype. Consistently, in the presence of ROS, ROS-related genes show high transcription levels in wild-type and Δblr strains but misregulation in Δhda-2 mutants. Finally, chromatin immunoprecipitations of histone H3 acetylated at Lys9/Lys14 on cat-3 and gst-1 promoters display low accumulation of H3K9K14ac in Δblr and Δhda-2 strains, suggesting indirect regulation of ROS-related genes by HDA-2. Our results point to a mutual dependence between HDA-2 and BLR proteins and reveal the role of these proteins in an intricate gene regulation landscape in response to blue light and ROS. IMPORTANCE Trichoderma atroviride is a free-living fungus commonly found in soil or colonizing plant roots and is widely used as an agent in biocontrol as it parasitizes other fungi, stimulates plant growth, and induces the plant defense system. To survive in various environments, fungi constantly sense and respond to potentially threatening external factors, such as light. In particular, UV light can damage biomolecules by producing free-radical reactions, in most cases involving reactive oxygen species (ROS). In T. atroviride, conidiation is essential for its survival, which is induced by light and mechanical injury. Notably, conidia are typically used as the inoculum in the field during biocontrol. Therefore, understanding the linkages between responses to light and exposure to ROS in T. atroviride is of major basic and practical relevance. Here, the histone deacetylase-encoding gene hda-2 is induced by light and ROS, and its product regulates growth, conidiation, blue light perception, and oxidative stress responses.

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