Oxygen (Basel, Switzerland)最新文献

{"title":"Spectrophotometric and Electrochemical Assessment of the Antioxidant Capacity of Aqueous and Ethanolic Extracts of Citrus Flavedos","authors":"M. Moreno, J. M. Rodríguez Mellado","doi":"10.3390/oxygen2020009","DOIUrl":"https://doi.org/10.3390/oxygen2020009","url":null,"abstract":"Citrus peel residues are of great interest due to the use of their extracted compounds in the food, pharmaceutical and cosmetic industries, mainly due to their antioxidant properties. The flavedo of this peel is especially relevant in modern culinary uses. The antioxidant capacity of the water and ethanolic extracts of the flavedos of ten peels was measured by a spectrophotometric assay and two electrochemical assays. The Folin–Ciocalteu values and ascorbic acid contents were also determined. From the results, it was concluded that the polyphenols extracted from the flavedos have antioxidant activities that occur through single-electron-transfer (SET) mechanisms rather than SET+ hydrogen atom transfer mechanisms. The polyphenols with high polarities extracted in the water constituted the least abundant fraction, and were better antioxidants than those with lower polarity extracted in the ethanol, which constituted the most abundant fraction.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48607629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cell Localization of DPI-Dependent Production of Superoxide in Reproductive Tissues of the Olive Tree (Olea europaea L.)","authors":"M. J. Jiménez-Quesada, A. Castro, E. Lima-Cabello, J. Alché","doi":"10.3390/oxygen2020007","DOIUrl":"https://doi.org/10.3390/oxygen2020007","url":null,"abstract":"Reactive Oxygen Species (ROS) are compounds derived from oxygen with important implications in biological processes in plants, some of them related to reproduction. Among ROS, superoxide is the primary oxidant, since an array of other ROS are eventually derived from this anion. Therefore, analysis of the molecular systems able to generate this molecule and the cellular compartmentalization of these events is of paramount importance. We have used the fluorochrome DCFH2-DA and the chromogenic substrate NBT in association with DPI (a specific inhibitor of Rboh enzymes generating superoxide in plants) in combination with confocal microscopy and stereomicroscopy, respectively to identify cell localization of ROS in general, and superoxide accumulation in olive reproductive tissues. A significant production of both ROS and superoxide has been described, showing a fairly precise spatial and temporal location throughout olive flower development. The reduction of the NBT signal after the addition of DPI suggests that the generation of superoxide is largely due to Rboh or other flavin oxidase activity. At the subcellular level, accumulation of O2●− has been located in the plasma membrane of mature pollen and germinated pollen, as well as in the rough endoplasmic reticulum and in mitochondria.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45255250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pulsed Electric Field-Based Extraction of Total Polyphenols from Sideritis raiseri Using Hydroethanolic Mixtures","authors":"V. Athanasiadis, Vasileios M. Pappas, D. Palaiogiannis, Theodoros G. Chatzimitakos, Eleni Bozinou, D. Makris, S. Lalas","doi":"10.3390/oxygen2020008","DOIUrl":"https://doi.org/10.3390/oxygen2020008","url":null,"abstract":"Polyphenols are an important class of compounds, due to their excellent antioxidant properties. Lately, much effort has been placed into developing new extraction techniques and optimizing them, so that polyphenols can be retrieved more efficiently from the plant materials. One of the most recent advances in extraction techniques is pulsed electric field extraction (PEF). This new technique is environmentally friendly and has the potential to maximize the recovery of compounds from plant tissues. Although the efficiency of PEF depends, among others, on the nature of the solvent used, up to date, there are no reports on the optimization of the PEF extraction of polyphenols, using hydroethanolic solutions of varying content in ethanol. In this study, three hydroethanolic solutions, water, and ethanol were used for the PEF-based extraction of total polyphenols from Sideritis raiseri. Results were conclusive that the 1:1 mixture of ethanol and water can increase by up to 146% the yield of polyphenols in the extract, highlighting the need to study more extensively, in the future, mixtures of solvents and not just plain water.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48934658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Free Radical Properties, Source and Targets, Antioxidant Consumption and Health","authors":"G. Martemucci, C. Costagliola, M. Mariano, L. D’andrea, P. Napolitano, A. D’Alessandro","doi":"10.3390/oxygen2020006","DOIUrl":"https://doi.org/10.3390/oxygen2020006","url":null,"abstract":"Free radicals have acquired growing importance in the fields of biology and medicine. They are produced during many different endogenous and exogenous processes. Mitochondria are the main source of endogenous reactive oxygen species (ROS) produced at cell level. The overproduction of free radicals can damage macromolecules such as nucleic acids, proteins and lipids. This leads to tissue damage in various chronic and degenerative diseases. Antioxidants play a crucial role in the body’s defense against free radicals. This review concerns the main properties of free radicals, their sources and deleterious effects. It highlights the potential role of the dietary supplementation of antioxidants and discusses unsolved problems regarding antioxidant supplements in the prevention and therapy of diseases.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41738531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lung Diffusing Capacity in Dutch Special Operations Forces Divers Exposed to Oxygen Rebreathers over 18 Years","authors":"Tom H.B. den Ouden, T. Wingelaar, E. Endert, P. V. van Ooij","doi":"10.3390/oxygen2020005","DOIUrl":"https://doi.org/10.3390/oxygen2020005","url":null,"abstract":"Exposure to hyperoxic conditions can induce pulmonary oxygen toxicity (POT). Divers of the Special Operations Forces (SOF) use oxygen rebreather systems during dives, and therefore are frequently exposed to hyperoxic conditions. Few studies have reported on POT in this population. This study reports on long-term pulmonary function tests (PFTs) and diffusing capacity in SOF divers to test the hypothesis that these measures of pulmonary function do not change clinically significantly during their career. The Royal Netherlands Navy performs yearly medical assessments of its military divers. All PFT and diffusing capacity data of SOF divers between the years 2000 and 2020 were analyzed using generalized estimating equations. The study included 257 SOF divers (median age, 27; interquartile range, 24–32), with 1612 dive medical assessments and a maximum follow-up time of 18.8 years. Alveolar volume (VA) and the diffusing capacity of carbon monoxide (TLCO) were significantly lower at baseline in smokers. Although these parameters were within the normal range, they declined over time and were significantly associated with age and years of diving. Smoking additionally affected TLCO and the transfer coefficient for carbon monoxide (KCO). TLCO and KCO were reduced by years of diving with oxygen rebreathers, albeit over clinically insignificant ranges, but smoking increased these changes by factors of 10 and 15, respectively.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42703696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Brief History of Oxygen: 250 Years on","authors":"J. Hancock","doi":"10.3390/oxygen2010004","DOIUrl":"https://doi.org/10.3390/oxygen2010004","url":null,"abstract":"Although there has been some controversy surrounding exactly when oxygen was first discovered, it is likely that that accolade should go to Carl Wilhelm Scheele, who isolated oxygen in 1772, or even a year earlier. Others since then have been given the credit for the instrumental work leading to the discovery including Joseph Priestley in 1774 and Antoine-Laurent Lavoisier. Oxygen, a paramagnetic, diradical gaseous (at room temperature) molecule, is instrumental to life as we know it. It is also crucial to some medical therapies, used in multiple industries and has even been found on other planets. The importance of oxygen cannot be overplayed. Now, 250 years since oxygen was discovered, it is timely to revisit some of the history, the controversies and look at how oxygen has evolved during that time. Here, a few of the highlights in oxygen research are discussed.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43793501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Inexpensive Incubator for Mammalian Cell Culture Capable of Regulating O2, CO2, and Temperature","authors":"P. Samokhin, Georgina L. Gardner, Christopher Moffatt, J. Stuart","doi":"10.3390/oxygen2010003","DOIUrl":"https://doi.org/10.3390/oxygen2010003","url":null,"abstract":"Mammalian cell culture is widely used for discovery and development. Recently, increasing attention has been paid to the importance of maintaining physiologically-relevant conditions in cell culture. Although oxygen level is a particularly important consideration, it is rarely regulated by experimentalists. The atmospheric O2 levels commonly used in cell culture are significantly higher than those experienced by most mammalian cells in vivo, leaving cells susceptible to oxidative damage, senescence, transformation, and otherwise aberrant physiology. A barrier to incorporating O2 regulation into most cell culture workflows has been the expense of investing in new equipment, as the vast majority of laboratory CO2 incubators do not regulate O2. Here, we describe an inexpensive (<CAD 1000), portable and user-friendly O2/CO2 incubator that can establish and maintain physiological O2, CO2, and temperature values within their physiological ranges. We used an Arduino-based approach to add O2 and CO2 control to a temperature-regulating egg incubator. Our incubator was tested against a commercial laboratory O2/CO2 incubator. Using Presens OxoDish technology, we demonstrate that at a setpoint value of 5% gas-phase incubator O2, media O2 averaged 5.03 (SD = 0.03) with a range of 4.98–5.09%. MCF7, LNCaP and C2C12 cell lines cultured in the incubator displayed normal morphology, proliferation, and viability. Culture for up to one week produced no contamination. Thus, our incubator provides an inexpensive means of maintaining physioxia in routine mammalian cell culture.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49415257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prolonged Cold Ischemia Did Not Impair Mitochondrial Oxygen Consumption or Reactive Oxygen Species Production in Human Uterine Fundus and Horn Myometrium","authors":"Mathilde Pélissié, A. Charles, F. Goupilleau, I. Georg, A. Bryand, B. Gény, O. Garbin","doi":"10.3390/oxygen2010002","DOIUrl":"https://doi.org/10.3390/oxygen2010002","url":null,"abstract":"Uterine transplantation may be a solution for infertility of uterine origin. Nevertheless, only three pregnancies with a live birth have so far been possible involving a uterine transplant from a brain-dead donor. Particularly, the impact of ischemia needs a better understanding. Analysis of mitochondrial respiration and production of reactive oxygen species (ROS) in muscle are of interest since they are pertinent markers of the harmful effects of ischemia. We therefore studied both uterine fundus and horn muscle mitochondrial use of oxygen and ROS production in eight women needing hysterectomy. High resolution respirometry and electron paramagnetic resonance allowed the determination of, respectively, myometrium oxidative capacity, hydrogen peroxide, mitochondrial free radical leak and superoxide anion production early (2 and 7 h) and late (24 h) following surgery. Mitochondrial oxygen consumption of the uterine fundus and horn tended to decrease with time but this was not statistically significant. Concerning ROS production, globally, we observed no significant change for H2O2, superoxide anion and free radical leak. In conclusion, a long period of cold ischemia did not impair myometrium mitochondrial respiration, only generating a transient H2O2 increase in uterine fundus. These data support that cold ischemia, even when prolonged, does not significantly alter uterine muscle oxidative capacity.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45889518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beneficial Effects of Antioxidants in Male Infertility Management: A Narrative Review","authors":"S. Cilio, Monica Rienzo, Gianluca Villano, Benito Fabio Mirto, Gaetano Giampaglia, Federico Capone, Gianpiero Ferretti, E. di Zazzo, F. Crocetto","doi":"10.3390/oxygen2010001","DOIUrl":"https://doi.org/10.3390/oxygen2010001","url":null,"abstract":"Background: Infertility, defined as the failure to conceive after one year of regular, unprotected intercourse, affects 50–80 million people worldwide. A male factor is involved in approximately 20–30% of cases. In the etiology of male infertility, the association between poor semen quality and oxidative stress (OS) is well known. High levels of reactive oxygen species (ROS) allow the oxidation of DNA, proteins, and lipids of sperm cells, modifying their vitality, motility, and morphology. Methods: To evaluate the effects of antioxidants on sperm in infertile men, we queried the MEDLINE database (via the PubMed interface) for published studies in the last 10 years (2011–2021). The following keywords were used: “infertility” and -“inositol”, -“alpha-lipoic acid”, -“zinc”, -“folate”, -“coenzyme Q10”, -“selenium”, and -“vitamin”. Results: Inositol regulates OS levels in sperm cells thanks to its role in mitochondrial reactions and is involved in several processes favoring sperm–oocyte interactions. Alpha-lipoic acid (ALA) reduces ROS damage and improves semen parameters in terms of spermatozoa’s motility, morphology, and count. Poor zinc nutrition may be related to low quality of sperm. Supplementation of folate plus zinc has a positive effect on the sperm concentration and morphology. Supplementation with CoQ10 increases sperm concentration, total and progressive motility. Selenium (Se) supplementation improves the overall semen quality and is related to a higher ejaculated volume. Among vitamins, only vitamin B12 shows a positive effect on semen quality; it increases sperm count and motility and reduces sperm DNA damage. Conclusions: In men showing low-quality semen, diet supplementation with antioxidants may improve the sperm quality by alleviating OS-induced sperm damage and enhancing hormone synthesis and spermatozoa concentration, motility, and morphology. Future clinical trials should be focused on the possible association of several antioxidants to take advantage of combined mechanisms of action.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42470968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of Oxygen Radicals in Alzheimer’s Disease: Focus on Tau Protein","authors":"A. Atlante, D. Valenti, V. Latina, G. Amadoro","doi":"10.3390/oxygen1020010","DOIUrl":"https://doi.org/10.3390/oxygen1020010","url":null,"abstract":"Oxygen free radical burst is a prominent early event in the pathogenesis of Alzheimer’s disease (AD). Posttranslational modifications of Tau protein, primarily hyper-phosphorylation and truncation, are indicated as critical mediators of AD pathology. This finding is confirmed by the high levels of oxidative stress markers and by the increased susceptibility to oxygen radicals found in cultured neurons and in brains from transgenic animal models expressing toxic Tau forms, in concomitance with a dramatic reduction in their viability/survival. Here, we collect the latest progress in research focused on the reciprocal and dynamic interplay between oxygen radicals and pathological Tau, discussing how these harmful species cooperate and/or synergize in the progression of AD. In this context, a better understanding of the role of oxidative stress in determining Tau pathology, and vice versa, primarily could be able to define novel biomarkers of early stages of human tauopathies, including AD, and then to develop therapeutic strategies aimed at attenuating, halting, or reversing disease progression.","PeriodicalId":74387,"journal":{"name":"Oxygen (Basel, Switzerland)","volume":"16 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41260565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}