Exploration of the Biological Role of Nitric Oxide in Sedum alfredii Hance under Heavy Metal Treatment

2014 ◽  
Vol 1073-1076 ◽  
pp. 274-277
Author(s):  
Xiao Ling Zhang
Keyword(s):  
Nitric Oxide ◽  
Heavy Metal ◽  
Signaling Pathways ◽  
Plant Species ◽  
Defense Responses ◽  
Contaminated Sites ◽  
Sedum Alfredii ◽  
Metal Treatment ◽  
Hyperaccumulating Plant

The hytoremediation is a promising, environmentally friendly alternative to conventional cleanup techniques for heavy metal contaminated sites. This study is intended to explore the physiological functions of nitric oxide (NO) in the signaling pathways as well as defense responses in Sedum Alfredii Hance, a new zinc (Zn) promising hyperaccumulating plant species for the phytoremediation exposured to Cd contaminations.

Influence of Nitrogen Nutrients on Hyperaccumulation of Sedum alfredii Hance under Complex Heavy Metals Stress

2013 ◽  
Vol 864-867 ◽  
pp. 190-193
Author(s):  
Xiao Ling Zhang ◽  
Qiao Yang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Environmental Issue ◽  
Contaminated Sites ◽  
Sedum Alfredii ◽  
Nutrient Levels ◽  
Heavy Metals Contamination ◽  
Accumulation Capacity ◽  
Nitrogen Nutrients ◽  
Hyperaccumulating Plant

Heavy metals contamination is a major environmental issue, and phytoremediation is a promising, environmentally friendly alternative to conventional cleanup techniques for heavy metal contaminated sites. this paper is intended to explore the influence of different nitrogen nutrient levels on hyperaccumulation of sedum alfredii, a promising hyperaccumulating plant species for the phytoremediation exposured to complex contaminations. The obtained results indicated that the proper increasing of nutriogen nutrient levels enhanced the accumulation capacity of complex heavy metals in sedum alfredii hance.

The Signaling Pathways in Nitric Oxide Production by Neutrophils Exposed to N-nitrosodimethylamine

2018 ◽  
Vol 16 (2) ◽  
pp. 194-199
Author(s):  
Wioletta Ratajczak-Wrona ◽  
Ewa Jablonska
Keyword(s):  
Nitric Oxide ◽  
Signaling Pathways ◽  
Molecular Mechanisms ◽  
Polymorphonuclear Neutrophils ◽  
Microbial Pathogens ◽  
Human Neutrophils ◽  
No Production ◽  
Oxide Synthase ◽  
Inducible Nitric Oxide

Background: Polymorphonuclear neutrophils (PMNs) play a crucial role in the innate immune system’s response to microbial pathogens through the release of reactive nitrogen species, including Nitric Oxide (NO). </P><P> Methods: In neutrophils, NO is produced by the inducible Nitric Oxide Synthase (iNOS), which is regulated by various signaling pathways and transcription factors. N-nitrosodimethylamine (NDMA), a potential human carcinogen, affects immune cells. NDMA plays a major part in the growing incidence of cancers. Thanks to the increasing knowledge on the toxicological role of NDMA, the environmental factors that condition the exposure to this compound, especially its precursors- nitrates arouse wide concern. Results: In this article, we present a detailed summary of the molecular mechanisms of NDMA’s effect on the iNOS-dependent NO production in human neutrophils. Conclusion: This research contributes to a more complete understanding of the mechanisms that explain the changes that occur during nonspecific cellular responses to NDMA toxicity.

Nitrate reductases and hemoglobins control nitrogen-fixing symbiosis by regulating nitric oxide accumulation

2020 ◽  
Author(s):  
Antoine Berger ◽  
Alexandre Boscari ◽  
Alain Puppo ◽  
Renaud Brouquisse
Keyword(s):  
Nitric Oxide ◽  
Defense Responses ◽  
Nodule Formation ◽  
No Production ◽  
Degradation Pathways ◽  
Atmospheric Nitrogen ◽  
Metabolic Intermediate ◽  
Hypoxic Environment ◽  
Nitrate Reductases

Abstract The interaction between legumes and rhizobia leads to the establishment of a symbiotic relationship between plant and bacteria. This is characterized by the formation of a new organ, the nodule, which facilitates the fixation of atmospheric nitrogen (N2) by nitrogenase through the creation of a hypoxic environment. Nitric oxide (NO) accumulates at each stage of the symbiotic process. NO is involved in defense responses, nodule organogenesis and development, nitrogen fixation metabolism, and senescence induction. During symbiosis, either successively or simultaneously, NO regulates gene expression, modulates enzyme activities, and acts as a metabolic intermediate in energy regeneration processes via phytoglobin-NO respiration and the bacterial denitrification pathway. Due to the transition from normoxia to hypoxia during nodule formation, and the progressive presence of the bacterial partner in the growing nodules, NO production and degradation pathways change during the symbiotic process. This review analyzes the different source and degradation pathways of NO, and highlights the role of nitrate reductases and hemoproteins of both the plant and bacterial partners in the control of NO accumulation.

scholarly journals Role of nitric oxide in plant responses to heavy metal stress: exogenous application versus endogenous production

2019 ◽  
Vol 70 (17) ◽  
pp. 4477-4488 ◽  
Author(s):  
Laura C Terrón-Camero ◽  
M Ángeles Peláez-Vico ◽  
Coral Del-Val ◽  
Luisa M Sandalio ◽  
María C Romero-Puertas
Keyword(s):  
Nitric Oxide ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Human Health Risk ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Future Research ◽  
Plant Responses ◽  
Research Perspectives

Abstract Anthropogenic activities, such as industrial processes, mining, and agriculture, lead to an increase in heavy metal concentrations in soil, water, and air. Given their stability in the environment, heavy metals are difficult to eliminate and can constitute a human health risk by entering the food chain through uptake by crop plants. An excess of heavy metals is toxic for plants, which have various mechanisms to prevent their accumulation. However, once metals enter the plant, oxidative damage sometimes occurs, which can lead to plant death. Initial production of nitric oxide (NO), which may play a role in plant perception, signalling, and stress acclimation, has been shown to protect against heavy metals. Very little is known about NO-dependent mechanisms downstream from signalling pathways in plant responses to heavy metal stress. In this review, using bioinformatic techniques, we analyse studies of the involvement of NO in plant responses to heavy metal stress, its possible role as a cytoprotective molecule, and its relationship with reactive oxygen species. Some conclusions are drawn and future research perspectives are outlined to further elucidate the signalling mechanisms underlying the role of NO in plant responses to heavy metal stress.

Role of Nitric Oxide in Overcoming Heavy Metal Stress

2020 ◽  
pp. 214-237
Author(s):  
Pradyumna Kumar Singh ◽  
Madhu Tiwari ◽  
Maria Kidwai ◽  
Dipali Srivastava ◽  
Rudra Deo Tripathi ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Heavy Metal ◽  
Heavy Metal Stress ◽  
Metal Stress

Role of Nitric Oxide Signaling Pathways in Brain Injuries

2010 ◽  
Vol 4 (3) ◽  
pp. 250-261
Author(s):  
Maria Aurelia Zorrilla-Zubilete ◽  
Damian Gustavo Maur ◽  
Maria Laura Palumbo ◽  
Ana Maria Genaro
Keyword(s):  
Nitric Oxide ◽  
Signaling Pathways ◽  
Brain Injuries ◽  
Nitric Oxide Signaling

scholarly journals Getting to NO Alzheimer’s Disease: Neuroprotection versus Neurotoxicity Mediated by Nitric Oxide

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Rachelle Balez ◽  
Lezanne Ooi
Keyword(s):  
Nitric Oxide ◽  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Signaling Pathways ◽  
Neuronal Excitability ◽  
Neurodegenerative Disorder ◽  
Memory Loss ◽  
Protective Role ◽  
Ionic Mechanisms

Alzheimer’s disease (AD) is a neurodegenerative disorder involving the loss of neurons in the brain which leads to progressive memory loss and behavioral changes. To date, there are only limited medications for AD and no known cure. Nitric oxide (NO) has long been considered part of the neurotoxic insult caused by neuroinflammation in the Alzheimer’s brain. However, focusing on early developments, prior to the appearance of cognitive symptoms, is changing that perception. This has highlighted a compensatory, neuroprotective role for NO that protects synapses by increasing neuronal excitability. A potential mechanism for augmentation of excitability by NO is via modulation of voltage-gated potassium channel activity (Kv7 and Kv2). Identification of the ionic mechanisms and signaling pathways that mediate this protection is an important next step for the field. Harnessing the protective role of NO and related signaling pathways could provide a therapeutic avenue that prevents synapse loss early in disease.

Heavy Metal Resistant Bacteria from Soil as Potential Bioremediation Targets: Isolation, Screening andamp; Biochemical Identification

2021 ◽  
Vol 43 (4) ◽  
pp. 493-493
Author(s):  
Khalid Khan and Zahid Khan Khalid Khan and Zahid Khan
Keyword(s):  
Heavy Metal ◽  
Bacterial Species ◽  
Contaminated Sites ◽  
Resistant Bacteria ◽  
Bacterial Strains ◽  
Potential Possibility ◽  
Biochemical Identification ◽  
High Degree ◽  
Quantitative Impact

This study investigates the role of bacterial species capable of mitigating metal-induced toxicity by bioaccumulation and biotransformation. Study focuses on five metals including Pb+2, Ni+2, Cd+2, Cr+2, and Cu+2 in a range of 50-300and#181;g/ml of concentration initially in qualitative (metal-specific) and subsequently quantitative (dose-specific) approach, but results turned out to be much in favor of a quantitative impact of the study. Thirty 30 bacterial strains from soil were isolated and biochemically identified that showed promising metal-resisting behavior. Identification of bacterial strain was based upon biochemical (phenotypic) method. The isolate number 1, 12, 29 and 30 showed high degree of resistance against all metals of concentration up to 300and#181;g/ml suggesting the potential possibility of these species of bacteria to provide some beneficial tools for bio-mining, and bioremediation as well as removing of metal contaminations from heavy metal contaminated sites.

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