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Hofmann H, Önder A, Becker J, Gröger M, Müller MM, Zink F, Stein B, Radermacher P, Waller C. Markers of oxidative stress during post-COVID-19 fatigue: a hypothesis-generating, exploratory pilot study on hospital employees. Front Med (Lausanne) 2023; 10:1305009. [PMID: 38111693 PMCID: PMC10725950 DOI: 10.3389/fmed.2023.1305009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 11/13/2023] [Indexed: 12/20/2023] Open
Abstract
Introduction Post-COVID-19 fatigue is common after recovery from COVID-19. Excess formation of reactive oxygen species (ROS) leading to oxidative stress-related mitochondrial dysfunction is referred to as a cause of these chronic fatigue-like symptoms. The present observational pilot study aimed to investigate a possible relationship between the course of ROS formation, subsequent oxidative stress, and post-COVID-19 fatigue. Method A total of 21 post-COVID-19 employees of the General Hospital Nuremberg suffering from fatigue-like symptoms were studied during their first consultation (T1: on average 3 months after recovery from COVID-19), which comprised an educational talk on post-COVID-19 symptomatology and individualized outpatient strategies to resume normal activity, and 8 weeks thereafter (T2). Fatigue severity was quantified using the Chalder Fatigue Scale together with a health survey (Patient Health Questionnaire) and self-report on wellbeing (12-Item Short-Form Health Survey). We measured whole blood superoxide anion (O 2 • - ) production rate (electron spin resonance, as a surrogate for ROS production) and oxidative stress-induced DNA strand breaks (single cell gel electrophoresis: "tail moment" in the "comet assay"). Results Data are presented as mean ± SD or median (interquartile range) depending on the data distribution. Differences between T1 and T2 were tested using a paired Wilcoxon rank sign or t-test. Fatigue intensity decreased from 24 ± 5 at T1 to 18 ± 8 at T2 (p < 0.05), which coincided with reduced O 2 • - formation (from 239 ± 55 to 195 ± 59 nmol/s; p < 0.05) and attenuated DNA damage [tail moment from 0.67 (0.36-1.28) to 0.32 (0.23-0.71); p = 0.05]. Discussion Our pilot study shows that post-COVID-19 fatigue coincides with (i) enhanced O 2 • - formation and oxidative stress, which are (ii) reduced with attenuation of fatigue symptoms.
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Affiliation(s)
- Hanna Hofmann
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
| | - Alexandra Önder
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
| | - Juliane Becker
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
| | - Michael Gröger
- Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Markus M Müller
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
| | - Fabian Zink
- Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Barbara Stein
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
| | - Peter Radermacher
- Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Christiane Waller
- Department of Psychosomatic Medicine and Psychotherapy, General Hospital Nuremberg, Paracelsus Medical University, Nuremberg, Germany
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Alvarez Villela M, Dunworth SA, Kraft BD, Harlan NP, Natoli MJ, Suliman HB, Moon RE. Effects of high-intensity interval training with hyperbaric oxygen. Front Physiol 2022; 13:963799. [PMID: 36060678 PMCID: PMC9437248 DOI: 10.3389/fphys.2022.963799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/27/2022] [Indexed: 11/29/2022] Open
Abstract
Hyperbaric Oxygen (HBO2) has been proposed as a pre-conditioning method to enhance exercise performance. Most prior studies testing this effect have been limited by inadequate methodologies. Its potential efficacy and mechanism of action remain unknown. We hypothesized that HBO2 could enhance aerobic capacity by inducing mitochondrial biogenesis via redox signaling in skeletal muscle. HBO2 was administered in combination with high-intensity interval training (HIIT), a potent redox stimulus known to induce mitochondrial biogenesis. Aerobic capacity was tested during acute hypobaric hypoxia seeking to shift the limiting site of whole body V̇O2 from convection to diffusion, more closely isolating any effect of improved oxidative capacity. Healthy volunteers were screened with sea-level (SL) V̇O2peak testing. Seventeen subjects were enrolled (10 men, 7 women, ages 26.5±1.3 years, BMI 24.6±0.6 kg m−2, V̇O2peak SL = 43.4±2.1). Each completed 6 HIIT sessions over 2 weeks randomized to breathing normobaric air, “HIIT+Air” (PiO2 = 0.21 ATM) or HBO2 (PiO2 = 1.4 ATM) during training, “HIIT+HBO2” group. Training workloads were individualized based on V̇O2peak SL test. Vastus Lateralis (VL) muscle biopsies were performed before and after HIIT in both groups. Baseline and post-training V̇O2peak tests were conducted in a hypobaric chamber at PiO2 = 0.12 ATM. HIIT significantly increased V̇O2peak in both groups: HIIT+HBO2 31.4±1.5 to 35.2±1.2 ml kg−1·min−1 and HIIT+Air 29.0±3.1 to 33.2±2.5 ml kg−1·min−1 (p = 0.005) without an additional effect of HBO2 (p = 0.9 for interaction of HIIT x HBO2). Subjects randomized to HIIT+HBO2 displayed higher skeletal muscle mRNA levels of PPARGC1A, a regulator of mitochondrial biogenesis, and HK2 and SLC2A4, regulators of glucose utilization and storage. All other tested markers of mitochondrial biogenesis showed no additional effect of HBO2 to HIIT. When combined with HIIT, short-term modest HBO2 (1.4 ATA) has does not increase whole-body V̇O2peak during acute hypobaric hypoxia. (ClinicalTrials.gov Identifier: NCT02356900; https://clinicaltrials.gov/ct2/show/NCT02356900).
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Affiliation(s)
- Miguel Alvarez Villela
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
| | - Sophia A. Dunworth
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
- Department of Anesthesiology, Duke University Medical Center, Durham, NC, United States
| | - Bryan D. Kraft
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, Durham, NC, United States
| | - Nicole P. Harlan
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, Durham, NC, United States
| | - Michael J. Natoli
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
| | - Hagir B. Suliman
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
| | - Richard E. Moon
- Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC, United States
- Department of Anesthesiology, Duke University Medical Center, Durham, NC, United States
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Duke University Medical Center, Durham, NC, United States
- *Correspondence: Richard E. Moon,
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Gunes AE, Yılmaz O, Erbas C, Dagli SN, Celik H. High serum 8-hydroxy-2'-deoxyguanosine levels predict DNA damage and aging in professional divers. REVISTA DA ASSOCIACAO MEDICA BRASILEIRA (1992) 2021; 67:1701-1705. [PMID: 34909901 DOI: 10.1590/1806-9282.20210748] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 08/30/2021] [Indexed: 11/21/2022]
Abstract
OBJECTIVE Reactive oxygen species and oxygen free radicals cause oxidative damage to lipids, proteins, and cell DNA in the cell membrane. Although many DNA products are produced during oxidative DNA damage, 8-hydroxy-2'-deoxyguanosine (8-OHdG) is the most common one, since it can be produced in in vivo environment. In recent years, diving has been done quite frequently for business and sports purposes all over the world. Increased environmental pressure in diving leads to hyperoxia and causes oxidative stress. METHODS The acute effects of diving on DNA damage were evaluated by comparing 8-hydroxy-2'-deoxyguanosine values of 15 professional diver groups before and after diving. In addition to the demographic characteristics, the serum 8-hydroxy-2'-deoxyguanosine levels of these 15 divers were compared with the control group consisting of nondiving medical students to examine the chronic effect of diving on DNA damage. RESULTS After deep dive, the amount of 8-hydroxy-2'-deoxyguanosine increased significantly in the diver group and acute DNA damage was observed (T1: 38.86±4.7; T2: 51.77±4.53; p<0.05). In the control group, the amount of 8-hydroxy-2'-deoxyguanosine was insignificant (C1: 47.48±3.73; T1: 38.86±4.7; p>0.05). CONCLUSIONS It was found that air dives caused an increase in serum 8-hydroxy-2'-deoxyguanosine levels, leading to acute oxidative stress and aging. However, there is no chronic side effect, according to the study of samples taken from the control group. This was thought to be due to the relative sedentary life of the control group. The duration of the effect or the ability to return to normal values should be investigated with further studies planned with large populations.
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Affiliation(s)
- Ali Erdal Gunes
- Harran University, School of Medicine, Department of Underwater and Hyperbaric Medicine - Sanliurfa, Turkey
| | - Ozgur Yılmaz
- Cukurova University, Yumurtalik Vocational School, Underwater Technology Programme - Adana, Turkey
| | - Celal Erbas
- Cukurova University, Yumurtalik Vocational School, Underwater Technology Programme - Adana, Turkey
| | - Seyda Nur Dagli
- Harran University, School of Medicine, Department of Medical Physiology - Sanliurfa, Turkey
| | - Hakim Celik
- Harran University, School of Medicine, Department of Medical Physiology - Sanliurfa, Turkey
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The Effects of Hyperbaric Oxygenation on Oxidative Stress, Inflammation and Angiogenesis. Biomolecules 2021; 11:biom11081210. [PMID: 34439876 PMCID: PMC8394403 DOI: 10.3390/biom11081210] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 07/30/2021] [Accepted: 08/09/2021] [Indexed: 02/06/2023] Open
Abstract
Hyperbaric oxygen therapy (HBOT) is commonly used as treatment in several diseases, such as non-healing chronic wounds, late radiation injuries and carbon monoxide poisoning. Ongoing research into HBOT has shown that preconditioning for surgery is a potential new treatment application, which may reduce complication rates and hospital stay. In this review, the effect of HBOT on oxidative stress, inflammation and angiogenesis is investigated to better understand the potential mechanisms underlying preconditioning for surgery using HBOT. A systematic search was conducted to retrieve studies measuring markers of oxidative stress, inflammation, or angiogenesis in humans. Analysis of the included studies showed that HBOT-induced oxidative stress reduces the concentrations of pro-inflammatory acute phase proteins, interleukins and cytokines and increases growth factors and other pro-angiogenesis cytokines. Several articles only noted this surge after the first HBOT session or for a short duration after each session. The anti-inflammatory status following HBOT may be mediated by hyperoxia interfering with NF-κB and IκBα. Further research into the effect of HBOT on inflammation and angiogenesis is needed to determine the implications of these findings for clinical practice.
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Hedetoft M, Jensen PØ, Moser C, Vinkel J, Hyldegaard O. Hyperbaric oxygen treatment impacts oxidative stress markers in patients with necrotizing soft-tissue infection. J Investig Med 2021; 69:1330-1338. [PMID: 34006573 PMCID: PMC8485130 DOI: 10.1136/jim-2021-001837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2021] [Indexed: 02/02/2023]
Abstract
Necrotizing soft-tissue infection (NSTI) is a rare, severe, and fast-progressing bacterial infection associated with a high risk of developing sepsis or septic shock. Increasing evidence indicates that oxidative stress is crucial in the development and progression of sepsis, but its role in NSTI specifically has not been investigated. Some patients with NSTI receive hyperbaric oxygen (HBO2) treatment as the restoration of oxidative stress balance is considered an important mechanism of action, which HBO2 facilitates. However, a gap in knowledge exists regarding the effect of HBO2 treatment on oxidative stress in patients with NSTI. In the present observational study, we aimed to investigate HBO2 treatment effects on known markers of oxidative stress in patients with NSTI. We measured plasma myeloperoxidase (MPO), superoxide dismutase (SOD), heme oxygenase-1 (HO-1) and nitrite+nitrate in 80 patients with NSTI immediately before and after their first HBO2 treatment, and on the following day. We found that HBO2 treatment was associated with a significant increase in MPO and SOD by a median of 3.4 and 8.8 ng/mL, respectively. Moreover, we observed an HBO2 treatment-associated increase in HO-1 in patients presenting with septic shock (n=39) by a median of 301.3 pg/mL. All markers were significantly higher in patients presenting with septic shock compared to patients without shock, and all markers correlated with disease severity. High baseline SOD was associated with 90-day mortality. In conclusion, HBO2 treatment was associated with an increase in MPO and SOD in patients with NSTI, and oxidative stress was more pronounced in patients with septic shock.
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Affiliation(s)
- Morten Hedetoft
- Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Peter Østrup Jensen
- Department of Clinical Microbiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.,Costerton Biofilm Center, Institute of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Claus Moser
- Department of Clinical Microbiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Julie Vinkel
- Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Ole Hyldegaard
- Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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Social Stress-Induced Oxidative DNA Damage Is Related to Prospective Cardiovascular Risk. J Clin Med 2020; 9:jcm9113783. [PMID: 33238572 PMCID: PMC7700520 DOI: 10.3390/jcm9113783] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/11/2020] [Accepted: 11/18/2020] [Indexed: 01/22/2023] Open
Abstract
Psychosocial stress increases cardiovascular risk, which coincides with enhanced oxidative DNA damage. Increased sympathetic tone-related catecholamine release causes oxidative stress, which contributes to catecholamine-related cardiotoxicity. Therefore, we tested the hypothesis whether acute psychosocial stress induces oxidative DNA damage, its degree being related to the cardiovascular risk profile and depending on the sympathetic stress response. After assessment of the prospective cardiovascular Münster score (PROCAM) to determine the risk of acute myocardial infarction, 83 male and 12 female healthy volunteers underwent the Trier social stress test for groups (TSST-G). Heart rate variability was quantified by measuring the standard deviation (SDNN) and root mean square of successive differences (RMSSD) between normal-to-normal inter-beat intervals. Salivary α-amylase (sAA) activity was assessed as a surrogate for noradrenaline plasma concentrations. Oxidative DNA damage was determined using whole-blood single-cell gel electrophoresis ("tail moment" in the "comet assay"). A total of 33 subjects presented with a prospective risk of myocardial infarction (risk+) vs. 59 subjects without risk (risk-). The TSST-G stress significantly increased blood pressure, heart rate, and sAA in both groups, while oxidative DNA damage was only increased in the risk+ group. Immediately after the TSST-G, the "tail moment" showed significant inverse linear relations with both SDNN and RMSSD. Acute psychosocial stress may cause oxidative DNA damage, the degree of which is directly related to the individual cardiovascular risk profile and depends on the stress-induced increase in the sympathetic tone.
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Tranfo G, Marchetti E, Pigini D, Miccheli A, Spagnoli M, Sciubba F, Conta G, Tomassini A, Fattorini L. Targeted and untargeted metabolomics applied to occupational exposure to hyperbaric atmosphere. Toxicol Lett 2020; 328:28-34. [PMID: 32305374 DOI: 10.1016/j.toxlet.2020.03.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 03/27/2020] [Accepted: 03/29/2020] [Indexed: 01/21/2023]
Abstract
Occupational exposure to hyperbaric atmosphere occurs in workers who carry out their activity in environments where breathing air pressure is at least 10% higher than pressure at sea level, and operations can be divided in Dry or Wet activities. The increased air pressure implies the formation of reactive oxygen species (ROS) and reactive nitrogen species (RNS), consumption of antioxidants and reduction of antioxidant enzyme activity, causing lipid peroxidation, DNA and RNA damage. The present study was aimed to establish the relation between hyperbaric exposure and metabolic changes due to ROS unbalance, by means of the determination of urinary biomarkers of oxidatively generated damage to DNA and RNA during a controlled diving session. The investigated biomarkers were 8-oxo-7,8-dihydroguanine (8-oxoGua), 8-oxo-7,8-dihydroguanosine (8-oxoGuo), and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodGuo). The experimental session involved six experienced divers subjected to 3 atmospheres absolute for 30 minutes in two different experiments, in both dry and wet conditions. Urine samples were collected at t = 0 (before exposure) and 30 (end of exposure),90, 240, 480 and 720 minutes. The concentration of 8-oxoGua, 8-oxoGuo, and 8-oxodGuo was determined by isotopic dilution high performance liquid chromatography (HPLC-MS/MS). In all subjects there is an increase of the urinary excretion of 8oxo-Guo and 8oxo-dGuo, in both conditions, after 1.5 - 4 hours from the start of the experiment, and that the values tend to return to the baseline after 12 hours. Besides that, also the nucleic magnetic resonance (NMR)-based untargeted metabolomics was employed for the same objective on the same samples, confirming a different metabolic response in the subjects exposed to dry or wet conditions. In particular, the observed hypoxanthine urinary level increases during the underwater hyperbaric exposure, in agreement with the trend observed for 8-oxoGuo and 8-oxodGuo levels. Present results confirmed the relationship between exposure and oxidative stress and depicted a clear temporal trend of the investigated biomarkers. Due to the possible negative consequences of oxidative stress on workers, present research shows a new line in term of risk prevention.
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Affiliation(s)
- Giovanna Tranfo
- INAIL, Department of Occupational Medicine, Epidemiology and Hygiene, Monte Porzio Catone, Rome Italy.
| | - Enrico Marchetti
- INAIL, Department of Occupational Medicine, Epidemiology and Hygiene, Monte Porzio Catone, Rome Italy.
| | - Daniela Pigini
- INAIL, Department of Occupational Medicine, Epidemiology and Hygiene, Monte Porzio Catone, Rome Italy.
| | - Alfredo Miccheli
- Department of Environmental Biology, NMR Based Metabolomics Laboratory, Sapienza University of Rome, Rome Italy.
| | - Mariangela Spagnoli
- INAIL, Department of Occupational Medicine, Epidemiology and Hygiene, Monte Porzio Catone, Rome Italy.
| | - Fabio Sciubba
- Department of Chemistry, Sapienza University of Rome, Italy.
| | - Giorgia Conta
- Department of Chemistry, Sapienza University of Rome, Italy.
| | - Alberta Tomassini
- Department of Biology and Biotechnology Charles Darwin, NMR Based Metabolomics Laboratory, Sapienza University of Rome, Italy.
| | - Luigi Fattorini
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, Italy.
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Zenske A, Kähler W, Koch A, Oellrich K, Pepper C, Muth T, Schipke JD. Does oxygen-enriched air better than normal air improve sympathovagal balance in recreational divers?An open-water study. Res Sports Med 2019; 28:397-412. [PMID: 31762338 DOI: 10.1080/15438627.2019.1694930] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Effects of the hyperbaric environment on the autonomic nervous system (ANS) in recreational divers are not firmly settled. Aim of this exploratory study was to (1) assess ANS changes during scuba diving via recordings of electrocardiograms (ECG) and to (2) study whether nitrox40 better improves sympathovagal balance over air. 13 experienced divers (~40yrs) performed two open-water dives each breathing either air or nitrox40 (25m/39min). 3-channel ECGs were recorded using a custom-made underwater Holter-monitor. The underwater Holter system proved to be safe. Air consumption exceeded nitrox40 consumption by 12% (n = 13; p < 0.05). Both air and nitrox40 dives reduced HR (10 vs 13%; p < 0.05). The overall HRV (pNN50: 82 vs 126%; p < 0.05) and its vagal proportion (RMSSD: 33 vs 50%; p < 0.05) increased during the dive. Moreover, low (LF: 61 vs 47%) and high (HF: 71 vs 140%) frequency power were increased (all p < 0.05), decreasing the ratio of LF to HF (22 vs 34%). : Conventional open-water dives distinctly affect the ANS in experienced recreational divers, with sympathetic activation less pronounced than vagal activation thereby improving the sympathovagal balance. Nitrox40 delivered two positive results: nitrox40 consumption was lower than air consumption, and nitrox40 better improved the sympathovagal balance over air.
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Affiliation(s)
- André Zenske
- Department of Anaesthesiology, Operative Intensive Medicine, and Pain Medicine, Klinikum St. Elisabeth Straubing , Straubing, Germany
| | - Wataru Kähler
- Maritime Medicine, German Naval Medical Institute , Kronshagen, Germany
| | - Andreas Koch
- Maritime Medicine, German Naval Medical Institute , Kronshagen, Germany
| | - Kerstin Oellrich
- Maritime Medicine, German Naval Medical Institute , Kronshagen, Germany
| | | | - Thomas Muth
- Institute of Occupational, Social and Environmental Medicine , Düsseldorf, Heinrich Heine University, Germany
| | - Jochen D Schipke
- Forschungsgruppe Experimentelle Chirurgie, Universitäts-Klinikum Düsseldorf , Düsseldorf, Germany
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Tranfo G, Paci E, Carrieri M, Marchetti E, Sisto R, Gherardi M, Costabile F, Bauleo L, Ancona C, Pigini D. Levels of Urinary Biomarkers of Oxidatively Generated Damage to DNA and RNA in Different Groups of Workers Compared to General Population. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16162995. [PMID: 31434269 PMCID: PMC6719150 DOI: 10.3390/ijerph16162995] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/08/2019] [Accepted: 08/16/2019] [Indexed: 12/12/2022]
Abstract
(1) Background: The products of guanine oxidation in DNA and RNA excreted in urine are 8-oxo-7,8-dihydroguanine (8-oxoGua), 8-oxo-7,8-dihydroguanosine (8-oxoGuo), and 8-oxo-7,8-dihydro-2’-deoxyguanosine (8-oxodGuo). Despite intra and inter-individual variability, it is possible to identify situations that significantly increase the levels of these compounds when comparing urinary concentrations of some workers to those of the general population. (2) Methods: urines from gasoline pump attendants (58 from Saudi Arabia and 102 from Italy), 24 workers of a fiberglass reinforced plastics plant, 17 painters and 6 divers were analyzed by HPLC/MS-MS. To test the individual variability, two subjects provided daily samples for one month, and 132 urine samples from the general population were analyzed. (3) Results: We summarized the results for each biomarker, and found the following were statistically higher than in the general population: 8-oxoGua in fiberglass and Italian gasoline workers; 8-oxodGuo in fiberglass and both Saudi Arabian and Italian gasoline workers; 8-oxoGuo in fiberglass workers, both Saudi Arabian and Italian gasoline workers, and painters after the working shift. (4) Conclusions: these results confirm that both 8-oxodGuo and 8-oxoGuo are valuable biomarkers for occupational exposures to dangerous chemicals and seem to suggest that 8-oxoGuo, related to RNA oxidation, is a suitable biomarker to evaluate short term, reversible effects of occupational exposures even within the health-based limit values.
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Affiliation(s)
- Giovanna Tranfo
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy.
| | - Enrico Paci
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy
| | - Mariella Carrieri
- Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, via Giustiniani 2, 35128 Padova, Italy
| | - Enrico Marchetti
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy
| | - Renata Sisto
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy
| | - Monica Gherardi
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy
| | - Francesca Costabile
- CNR-ISAC-Italian National Research Council, Institute of Atmospheric Science and Climate, via Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Lisa Bauleo
- Department of Epidemiology, Lazio Regional Health Service, Via Cristoforo Colombo 112, 00147 Rome, Italy
| | - Carla Ancona
- Department of Epidemiology, Lazio Regional Health Service, Via Cristoforo Colombo 112, 00147 Rome, Italy
| | - Daniela Pigini
- Department of Occupational Medicine, Epidemiology, Occupational and Environmental Hygiene, INAIL Research, via Fontana Candida 1, Monte Porzio Catone, 00078 Rome, Italy
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The Effects of Hyperbaric Oxygen at Different Pressures on Oxidative Stress and Antioxidant Status in Rats. ACTA ACUST UNITED AC 2019; 55:medicina55050205. [PMID: 31137620 PMCID: PMC6572368 DOI: 10.3390/medicina55050205] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/24/2019] [Accepted: 05/21/2019] [Indexed: 02/07/2023]
Abstract
Background: The optimal use of oxygen at greater than atmospheric pressures in any operational or therapeutic application (hyperbaric oxygen, HBO2) requires awareness of the fact that the beneficial effects of oxygen coexist with toxic effects depending on the pressure and duration of exposure. In this study, we aimed to investigate the effect of HBO2 therapy on oxidative stress and antioxidant status in commonly used protocol for acute HBO2 indications, such as carbon monoxide intoxication, central retinal artery occlusion, crush injury, gas gangrene, and to compare it with normobaric oxygen (NBO2) in healthy rats. Materials and Methods: Fifty-six male, young adult Wistar albino rats were randomly divided into seven groups and named as Group I through Group VII. Plasma malondialdehyde (MDA), superoxide dismutase (SOD), and erythrocyte glutathione (GSH) levels in control group were compared to the levels in other groups. Results: The increases in MDA levels and the decrease in SOD activities were statistically significant in HBO2 groups at the end of the first 24 h when compared to the control group, and the significant decrease in erythrocyte GSH level was only at 2.4 atmospheres absolute. Conclusions: The present study showed that pressure and frequency of exposure are important factors to consider when investigating HBO2-induced oxidative stress and antioxidant response.
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Tillmans F, Sharghi R, Noy T, Kähler W, Klapa S, Sartisohn S, Sebens S, Koch A. Effect of hyperoxia on the immune status of oxygen divers and endurance athletes. Free Radic Res 2019; 53:522-534. [PMID: 31117828 DOI: 10.1080/10715762.2019.1612890] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Physical activity, particularly that, exerted by endurance athletes, impacts the immune status of the human body. Prolonged duration and high-intensity endurance training lead to increased production of reactive oxygen species (ROS) and thereby to oxidative stress. Military combat swimmers (O2-divers) are regularly exposed to hyperbaric hyperoxia (HBO) in addition to intensive endurance training intervals. They are, therefore, exposed to extreme levels of oxidative stress. Several studies support that the intensity of oxidative stress essentially determines the effect on immune status. The aim of this study was to comparatively characterise peripheral blood mononuclear cells (PBMCs) of O2-divers (military combat swimmers), endurance athletes (amateur triathletes), and healthy control volunteers with respect to DNA fragmentation, immune status and signs of inflammation. Furthermore, it was investigated how PBMCs from these groups responded acutely to exposure to HBO. We showed that DNA fragmentation was comparable in PBMCs of all three groups under basal conditions directly after HBO exposure. However, significantly higher DNA fragmentation was observed in O2-divers 18 hours after HBO, possibly indicating a slower recovery. O2-divers also exhibited a proinflammatory immune status exemplified by an elevated number of CD4+CD25+ T cells, elevated expression of proinflammatory cytokine IL-12, and diminished expression of anti-inflammatory TGF-β1 compared to controls. Supported by a decreased basal gene expression and prolonged upregulation of anti-oxidative HO-1, these data suggest that higher oxidative stress levels, as present under intermitted hyperbaric hyperoxia, e.g. through oxygen diving, promote a higher inflammatory immune status than oxidative stress through endurance training alone.
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Affiliation(s)
- Frauke Tillmans
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
| | - Roshanak Sharghi
- b Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel , Kiel , Germany
| | - Tatjana Noy
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
| | - Wataru Kähler
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
| | - Sebastian Klapa
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
| | - Simon Sartisohn
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
| | - Susanne Sebens
- b Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel , Kiel , Germany
| | - Andreas Koch
- a Naval Institute for Maritime Medicine , Kronshagen , Germany
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Tchirikov M, Saling E, Bapayeva G, Bucher M, Thews O, Seliger G. Hyperbaric oxygenation and glucose/amino acids substitution in human severe placental insufficiency. Physiol Rep 2019. [PMID: 29536649 PMCID: PMC5849598 DOI: 10.14814/phy2.13589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In the first case, the AA and glucose were infused through a perinatal port system into the umbilical vein at 30 weeks' gestation due to severe IUGR. The patient received daily hyperbaric oxygenation (HBO, 100% O2) with 1.4 atmospheres absolute for 50 min for 7 days. At 31+4 weeks' gestation, the patient gave birth spontaneously to a newborn weighing 1378 g, pH 7.33, APGAR score 4/6/intubation. In follow‐up examinations at 5 years of age, the boy was doing well without any neurological disturbance or developmental delay. In the second case, the patient presented at 25/5 weeks' gestation suffering from severe IUGR received HBO and maternal AA infusions. The cardiotocography was monitored continuously during HBO treatment. The short‐time variations improved during HBO from 2.9 to 9 msec. The patient developed pathologic CTG and uterine contractions 1 day later and gave birth to a hypotrophic newborn weighing 420 g. After initial adequate stabilization, the extremely preterm newborn unfortunately died 6 days later. Fetal nutrition combined with HBO is technically possible and may allow the prolongation of the pregnancy. Fetal‐specific amino‐acid composition would facilitate the treatment options of IUGR fetuses and extremely preterm newborn.
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Affiliation(s)
- Michael Tchirikov
- Center of Fetal Surgery, University Clinic of Obstetrics and Fetal Medicine, University Medical Center Halle (Saale), Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Erich Saling
- Saling Institute of Perinatal Medicine, Berlin, Germany
| | - Gauri Bapayeva
- National Research Center for Mother and Child Health, Nazarbayev University, Astana, Republic of Kazakhstan
| | - Michael Bucher
- Center of HBO, University Clinic of Anesthesiology, University Medical Center Halle (Saale), Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Oliver Thews
- Institute of Physiology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Gregor Seliger
- Center of Fetal Surgery, University Clinic of Obstetrics and Fetal Medicine, University Medical Center Halle (Saale), Martin Luther University Halle-Wittenberg, Halle, Germany
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13
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Lu QZ, Li X, Ouyang J, Li JQ, Chen G. Further application of hyperbaric oxygen in prostate cancer. Med Gas Res 2019; 8:167-171. [PMID: 30713670 PMCID: PMC6352573 DOI: 10.4103/2045-9912.248268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 10/30/2018] [Indexed: 11/26/2022] Open
Abstract
Hyperbaric oxygen therapy (HBOT) has been used as an adjuvant treatment for multiple pathological states, which involves hypoxic conditions. Over the past 50 years, HBOT has been recommended and used in a wide variety of medical conditions, clinically in the treatment of ischemic or nonhealing wounds and radiation-injured tissue, and in the treatment of malignancy. The mechanism of this treatment is providing oxygen under pressure which is higher than the atmosphere thus increasing tissue oxygen concentration. When cells get enough oxygen in the microenvironment, they become active and replicate effectively. Prostate cancer is the second most common cancer and the fifth leading cause of cancer death among male around the world. It is estimated that more than 29,000 men died from metastatic prostate cancer in 2014. With the development of the prostate-specific antigen-based screening technology, prostate cancer incidence has increased markedly over time. According to the survey, the morbidity and mortality of prostate cancer have surpassed bladder cancer and renal carcinoma, becoming the most common cancer in urology in Chinese adults. Nowadays, the main solution to deal with prostate cancer is still the surgical ways, including laparoscopic radical prostatectomy and robot-assisted radical prostatectomy. Nevertheless, the complications of the surgical treatment have not been completely avoided. HBOT has gained great clinical recognition over the decade. It has been demonstrated that HBOT has considerable effects on carcinoma, especially on decreasing complications and improving mortality. So, it is important to combine the HBOT with patients who suffer from prostate cancer. This review illuminates the effect and underlying mechanism of the HBOT in prostate cancer for further clinical application.
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Affiliation(s)
- Qi-Zhong Lu
- Department Department of Urology and Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Xiang Li
- Department Department of Urology and Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Jun Ouyang
- Department Department of Urology and Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Jin-Quan Li
- Department Department of Urology and Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Gang Chen
- Department Department of Urology and Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
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Bosco G, Rizzato A, Quartesan S, Camporesi E, Mangar D, Paganini M, Cenci L, Malacrida S, Mrakic-Sposta S, Moretti S, Paoli A. Effects of the Ketogenic diet in overweight divers breathing Enriched Air Nitrox. Sci Rep 2018; 8:2655. [PMID: 29422679 PMCID: PMC5805750 DOI: 10.1038/s41598-018-20933-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 01/25/2018] [Indexed: 02/07/2023] Open
Abstract
Central Nervous System Oxygen Toxicity (CNS-OT) is one of the most harmful effects of Enriched Air Nitrox (EAN) diving. Protective factors of the Ketogenic Diet (KD) are antioxidant activity, the prevention of mitochondrial damage and anti-inflammatory mechanisms. We aimed to investigate if a short-term KD may reduce oxidative stress and inflammation during an hyperoxic dive. Samples from six overweight divers (mean ± SD, age: 55.2 ± 4.96 years; BMI: 26.7 ± 0.86 kg/m2) were obtained a) before and after a dive breathing Enriched Air Nitrox and performing 20-minute mild underwater exercise, b) after a dive (same conditions) performed after 7 days of KD. We measured urinary 8-isoprostane and 8-OH-2-deoxyguanosine and plasmatic IL-1β, IL-6 and TNF-α levels. The KD was successful in causing weight loss (3.20 ± 1.31 Kgs, p < 0.01) and in limiting lipid peroxidation (3.63 ± 1.16 vs. 1.11 ± 0.22; p < 0.01) and inflammatory response (IL-1β = 105.7 ± 25.52 vs. 57.03 ± 16.32, p < 0.05; IL-6 = 28.91 ± 4.351 vs. 14.08 ± 1.74, p < 0.001; TNF-α = 78.01 ± 7.69 vs. 64.68 ± 14.56, p < 0.05). A short-term KD seems to be effective in weight loss, in decreasing inflammation and protective towards lipid peroxidation during hyperoxic diving.
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Affiliation(s)
- Gerardo Bosco
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Alex Rizzato
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy.
| | - Silvia Quartesan
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | | | - Matteo Paganini
- Emergency Medicine Residency Program, University of Padova, Padova, Italy
| | - Lorenzo Cenci
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Sandro Malacrida
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | - Sara Moretti
- CNR Institute of Bioimaging and Molecular Physiology, Segrate (Milano), Italy
| | - Antonio Paoli
- Environmental physiology & medicine Lab, Department of Biomedical Sciences, University of Padova, Padova, Italy
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Hyperbaric hyperoxia alters innate immune functional properties during NASA Extreme Environment Mission Operation (NEEMO). Brain Behav Immun 2015; 50:52-57. [PMID: 26116982 DOI: 10.1016/j.bbi.2015.06.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 06/19/2015] [Accepted: 06/22/2015] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Spaceflight is associated with immune dysregulation which is considered as risk factor for the performance of exploration-class missions. Among the consequences of confinement and other environmental factors of living in hostile environments, the role of different oxygen concentrations is of importance as either low (e.g. as considered for lunar or Martian habitats) or high (e.g. during extravehicular activities) can trigger immune dysfunction. The aim of this study was to investigate the impact of increased oxygen availability--generated through hyperbaricity--on innate immune functions in the course of a 14 days NEEMO mission. METHODS 6 male subjects were included into a 14 days undersea deployment at the Aquarius station (Key Largo, FL, USA). The underwater habitat is located at an operating depth of 47 ft. The 2.5 times higher atmospheric pressure in the habitat leads to hyperoxia. The collection of biological samples occurred 6 days before (L-6), at day 7 (MD7) and 11/13 (MD11/13) during the mission, and 90 days thereafter (R). Blood analyses included differential blood cell count, ex vivo innate immune activation status and inhibitory competences of granulocytes. RESULTS The absolute leukocyte count showed an increase during deployment as well as the granulocyte and monocyte count. Lymphocyte count was decreased on MD7. The assessments of native adhesion molecules on granulocytes (CD11b, CD62L) indicated a highly significant cellular activation (L-6 vs. MD7/MD13) during mission. In contrast, granulocytes were more sensitive towards anti-inflammatory stimuli (adenosine) on MD13. CONCLUSION Living in the NEEMO habitat for 14 days induced significant immune alterations as seen by an activation of adhesion molecules and vice versa higher sensitivity towards inhibition. This investigation under hyperbaric hyperoxia is important especially for Astronauts' immune competence during extravehicular activities when exposed to similar conditions.
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Sureda A, Batle JM, Capó X, Martorell M, Córdova A, Tur JA, Pons A. Scuba diving induces nitric oxide synthesis and the expression of inflammatory and regulatory genes of the immune response in neutrophils. Physiol Genomics 2014; 46:647-54. [PMID: 25005793 DOI: 10.1152/physiolgenomics.00028.2014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVE Scuba diving, characterized by hyperoxia and hyperbaria, could increase reactive oxygen species production which acts as signaling molecules to induce adaptation against oxidative stress. The aim was to study the effects of scuba diving immersion on neutrophil inflammatory response, the induction of oxidative damage, and the NO synthesis. DESIGN Nine male divers performed a dive at 50 m depth for a total time of 35 min. Blood samples were obtained at rest before the dive, after the dive, and 3 h after the diving session. MEASUREMENTS Markers of oxidative and nitrosative damage, nitrite, and the gene expression of genes related with the synthesis of nitric oxide and lipid mediators, cytokine synthesis, and inflammation were determined in neutrophils. RESULTS The mRNA levels of genes related with the inflammatory and immune response of neutrophils, except TNF-α, myeloperoxidase, and toll-like receptor (TLR) 2, significantly increased after the recovery period respect to predive and postdive levels. NF-κB, IL-6, and TLR4 gene expression reported significant differences immediately after diving respect to the predive values. Protein nitrotyrosine levels significantly rose after diving and remained high during recovery, whereas no significant differences were reported in malondialdehyde. Neutrophil nitrite levels as indicative of inducible nitric oxide synthase (iNOS) activity progressively increased after diving and recovery. The iNOS protein levels maintained the basal values in all situations. CONCLUSION Scuba diving which combines hyperoxia, hyperbaria, and acute exercise induces nitrosative damage with increased nitrotyrosine levels and an inflammatory response in neutrophils.
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Affiliation(s)
- Antoni Sureda
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
| | - Juan M Batle
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
| | - Xavier Capó
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
| | - Miquel Martorell
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
| | - Alfredo Córdova
- Department of Biochemistry and Physiology, School of Physical Therapy, University of Valladolid, Soria, Spain
| | - Josep A Tur
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
| | - Antoni Pons
- Laboratori de Ciències de la Activitat Física, Research Group on Community Nutrition and Oxidative Stress, Departament de Biologia Fonamental i Ciències de la Salut, University of Balearic Islands, Palma de Mallorca, Spain, and CIBER: CB12/03/30038 Fisiopatología de la Obesidad y la Nutrición, CIBERobn, Instituto de Salud Carlos III (ISCIII), Spain; and
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Arieli Y, Kotler D, Eynan M, Hochman A. Hyperbaric oxygen preconditioning protects rats against CNS oxygen toxicity. Respir Physiol Neurobiol 2014; 197:29-35. [DOI: 10.1016/j.resp.2014.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 02/03/2014] [Accepted: 03/18/2014] [Indexed: 11/28/2022]
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Junghans P. Estimate of production of gaseous nitrogen in the human body based on (15)N analysis of breath N2 after administration of [(15)N2]urea. ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES 2013; 49:454-463. [PMID: 24219365 DOI: 10.1080/10256016.2013.828718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
After oral administration of [(15)N2]urea (1.5 mmol, 95 atom% (15)N), we found that breath N2 was significantly (15)N-labelled. The result suggests that molecular nitrogen in breath must be partly produced endogenously. Based on a metabolic model, the endogenous N2 production was estimated to be 0.40±0.25 mmol kg(-1) d(-1) or 2.9±1.8 % of the total (urinary and faecal) N excretion in fasted healthy subjects (n=4). In patients infected with Helicobacter pylori (n=5), the endogenous N2 production was increased to 1.24±0.59 mmol kg(-1) d(-1) or 9.0±4.3 % of the total N excretion compared to the healthy controls (p<0.05). We conclude that N balance and gas exchange measurements may be affected by endogenously produced nitrogen, especially in metabolic situations with elevated nitrosation, for instance in oxidative and nitrosative stress-related diseases such as H. pylori infections.
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Affiliation(s)
- Peter Junghans
- a Leibniz Institute for Farm Animal Biology, Institute of Nutritional Physiology 'Oskar Kellner' , Dummerstorf , Germany
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Curran-Everett D. Explorations in statistics: the analysis of ratios and normalized data. ADVANCES IN PHYSIOLOGY EDUCATION 2013; 37:213-9. [PMID: 24022766 DOI: 10.1152/advan.00053.2013] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Learning about statistics is a lot like learning about science: the learning is more meaningful if you can actively explore. This ninth installment of Explorations in Statistics explores the analysis of ratios and normalized-or standardized-data. As researchers, we compute a ratio-a numerator divided by a denominator-to compute a proportion for some biological response or to derive some standardized variable. In each situation, we want to control for differences in the denominator when the thing we really care about is the numerator. But there is peril lurking in a ratio: only if the relationship between numerator and denominator is a straight line through the origin will the ratio be meaningful. If not, the ratio will misrepresent the true relationship between numerator and denominator. In contrast, regression techniques-these include analysis of covariance-are versatile: they can accommodate an analysis of the relationship between numerator and denominator when a ratio is useless.
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Affiliation(s)
- Douglas Curran-Everett
- Division of Biostatistics and Bioinformatics, National Jewish Health, Denver, Colorado; and Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado, Denver, Colorado
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Pande S, Sengupta A, Srivastava A, Gude RP, Ingle A. Re-evaluate the effect of hyperbaric oxygen therapy in cancer - a preclinical therapeutic small animal model study. PLoS One 2012; 7:e48432. [PMID: 23144880 PMCID: PMC3492351 DOI: 10.1371/journal.pone.0048432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 09/25/2012] [Indexed: 01/12/2023] Open
Abstract
Tumor hypoxia is a known driver of angiogenesis that also facilitates tumor growth. Moreover, poorly oxygenated central tumor area remains relatively radio or chemo resistant. HBO therapy is known to elevate the levels of dissolved oxygen and eliminates tumor hypoxia. It has been one of the modalities in cancer treatment; therefore its optimization is important. In this experimental study, no cancer enhancing effect was seen during the course of HBO therapy; however, post therapy there was an accelerated growth and progression of tumor. HBO treated mice lived shorter and the response to therapy was dose & tumor volume dependent. HBO therapy probably exert its effect on the cancer proliferating cells through multiple pathways such as increased DNA damage, apoptosis & geno-toxicity leading to slow cancer progression while post therapy tumorigenic effect could be due to impaired DNA repair mechanism, mutagenic effect & aneuploidy as well as altered blood supply & nutrients. Tumor growth reached plateau with time and this finding validated theoretical model predicting tumor reaching an asymptotic limit. While, marked asymmetry observed in tumor volume progression or cancer cell proliferation rate in each of the experimental C3H mouse suggested a need for an alternate small animal pre-clinical cancer therapeutic model.
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Affiliation(s)
- Sneha Pande
- Bioengineering Laboratory, Advanced Centre for Treatment, Research & Education in Cancer, TATA Memorial Centre, New Mumbai, Maharashtra, India
| | - Amit Sengupta
- Bioengineering Laboratory, Advanced Centre for Treatment, Research & Education in Cancer, TATA Memorial Centre, New Mumbai, Maharashtra, India
| | - Anurag Srivastava
- Department of Cancer Surgery, All India Institute of Medical Science, New Delhi, India
| | - Rajiv P. Gude
- Gude Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, TATA Memorial Centre, New Mumbai, Maharashtra, India
| | - Arvind Ingle
- Laboratory Animal Facilities, Advanced Centre for Treatment, Research and Education in Cancer, TATA Memorial Centre, New Mumbai, Maharashtra, India
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Üstündağ A, Şimşek K, Ay H, Dündar K, Süzen S, Aydın A, Duydu Y. DNA integrity in patients undergoing hyperbaric oxygen (HBO) therapy. Toxicol In Vitro 2012; 26:1209-15. [DOI: 10.1016/j.tiv.2012.06.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Revised: 06/11/2012] [Accepted: 06/19/2012] [Indexed: 11/24/2022]
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Abstract
Using hyperbaric oxygen (HBO) therapy as an in vivo oxidation model, we investigated the effect of a diet enriched in ascorbic acid (AA) on HBO-induced oxidative stress. Volunteers (n 46) were allocated to the AA-rich diet group or the control group. Blood samples were collected at the basal time, after the 1-week diet before and immediately after the HBO treatment, and 1 week after the HBO treatment. AA level, total antioxidant status (TAS), hydroperoxides (HP), lymphocyte DNA oxidation and DNA repair capacity were assessed. The expression of genes involved in oxidative stress was evaluated in lymphocytes and the protein activity of the modulated genes was determined in the plasma. The AA level and the antioxidant status of plasma were increased by AA-rich food consumption. HBO exposure did not affect the AA levels or TAS, but induced HP formation in the control group. The lymphocytes isolated from dietary-supplemented subjects were resistant to ex vivo DNA oxidation, showing an increased DNA repair capacity compared with controls. A difference in gene expression pattern was observed between the groups. AA-rich foods provide dual protection against oxidative stress, enhancing plasma antioxidant levels and stimulating genes involved in cell detoxification.
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Simsek K, Ay H, Topal T, Ozler M, Uysal B, Ucar E, Acikel CH, Yesilyurt O, Korkmaz A, Oter S, Yildiz S. Long-term exposure to repetitive hyperbaric oxygen results in cumulative oxidative stress in rat lung tissue. Inhal Toxicol 2011; 23:166-72. [PMID: 21391785 DOI: 10.3109/08958378.2011.558528] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT Despite its known benefits, hyperbaric oxygen (HBO) is also reported to enhance the production of reactive oxygen species and can cause oxidative stress in several tissues. Previous studies had shown that HBO-induced oxidative stress is directly proportional to both its exposure pressure and duration. Nevertheless, these studies were usually performed with single-session HBO exposure but its clinical use commonly depends on long-term exposure periods. OBJECTIVE To clarify the oxidative effect of long-term repetitive HBO in the lung tissue of rats. MATERIALS AND METHODS Male Sprague-Dawley rats were divided into six study groups exposed to consecutive HBO sessions (2.8 atm/90 min) for 5, 10, 15, 20, 30, and 40 days. Animals were sacrificed 24 h after the last HBO session. An additional control group was set to obtain normal data. Lung malondialdehyde (MDA) and carbonylated protein (PCC) levels were determined as measures of oxidative stress along with the activities of the antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase. RESULTS None of the measured parameters showed any changes among the groups exposed to 5-15 HBO sessions. However, MDA, PCC, and SOD were found to be significantly increased in the 20 to 40 session groups. DISCUSSION AND CONCLUSION These results indicate that repetitive treatment with HBO may cause oxidative stress in critical tissues including the lung. Although HBO-mediated free radicals are accepted to be responsible for the benefits of this therapeutic modality, especially in cases with prolonged exposure, possible injurious effects of supranormal values of bio-oxidative products need to be considered.
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Affiliation(s)
- Kemal Simsek
- Gulhane Military Medical Academy, Department of Undersea and Hyperbaric Medicine, Ankara, Turkey
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Venetsanou K, Fildissis G, Tokta R, Brinias C, Baltopoulos G. The role of nitric oxide in cellular response to hyperbaric conditions. Eur J Appl Physiol 2011; 112:677-87. [DOI: 10.1007/s00421-011-2027-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 05/23/2011] [Indexed: 12/21/2022]
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Stiegler P, Matzi V, Pierer E, Hauser O, Schaffellner S, Renner H, Greilberger J, Aigner R, Maier A, Lackner C, Iberer F, Smolle-Jüttner FM, Tscheliessnigg K, Stadlbauer V. Creation of a prevascularized site for cell transplantation in rats. Xenotransplantation 2011; 17:379-90. [PMID: 20955294 DOI: 10.1111/j.1399-3089.2010.00606.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Transplanted cells, especially islet cells, are likely to become apoptotic due to local hypoxia leading to graft dysfunction. Isolated pancreatic islet cells depend on the diffusion of oxygen from the surrounding tissue; therefore, access to sufficient oxygen supply is beneficial, particularly when microcapsules are used for immunoisolation in xenotransplantation. The aim of this study was to create a prevascularized site for cell transplantation in rats and test its effectiveness with microencapsulated HEK293 cells. METHODS The combination of implantation of a foam dressing, vacuum-assisted wound closure (foam+VAC) and hyperbaric oxygenation (HBO) was used in 40 Sprague-Dawley rats. Blood flow and vascular endothelial growth factor (VEGF) levels were determined. Sodium cellulose sulphate (SCS)-microencapsulated HEK293 cells were xenotransplanted into the foam dressing in rats pre-treated with HBO, and angiogenesis and apoptosis were assessed. RESULTS Vessel ingrowth and VEGF levels increased depending on the duration of HBO treatment. The area containing the foam was perfused significantly better in the experimental groups when compared to controls. Only a small amount of apoptosis occurs in SCS-microencapsulated HEK293 cells after xenotransplantation. CONCLUSION As ischemia-damaged cells are likely to undergo cell death or loose functionality due to hypoxia, therefore leading to graft dysfunction, the combination foam+VAC and HBO might be a promising method to create a prevascularized site to achieve better results in xenogeneic cell transplantation.
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Affiliation(s)
- Philipp Stiegler
- Department of Surgery, Division of Transplantation Surgery, Medical University Graz, Graz, Austria.
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Abstract
The current practice of mechanical ventilation comprises the use of the least inspiratory O2 fraction associated with an arterial O2 tension of 55 to 80 mm Hg or an arterial hemoglobin O2 saturation of 88% to 95%. Early goal-directed therapy for septic shock, however, attempts to balance O2 delivery and demand by optimizing cardiac function and hemoglobin concentration, without making use of hyperoxia. Clearly, it has been well-established for more than a century that long-term exposure to pure O2 results in pulmonary and, under hyperbaric conditions, central nervous O2 toxicity. Nevertheless, several arguments support the use of ventilation with 100% O2 as a supportive measure during the first 12 to 24 hrs of septic shock. In contrast to patients without lung disease undergoing anesthesia, ventilation with 100% O2 does not worsen intrapulmonary shunt under conditions of hyperinflammation, particularly when low tidal volume-high positive end-expiratory pressure ventilation is used. In healthy volunteers and experimental animals, exposure to hyperoxia may cause pulmonary inflammation, enhanced oxidative stress, and tissue apoptosis. This, however, requires long-term exposure or injurious tidal volumes. In contrast, within the timeframe of a perioperative administration, direct O2 toxicity only plays a negligible role. Pure O2 ventilation induces peripheral vasoconstriction and thus may counteract shock-induced hypotension and reduce vasopressor requirements. Furthermore, in experimental animals, a redistribution of cardiac output toward the kidney and the hepato-splanchnic organs was observed. Hyperoxia not only reverses the anesthesia-related impairment of the host defense but also is an antibiotic. In fact, perioperative hyperoxia significantly reduced wound infections, and this effect was directly related to the tissue O2 tension. Therefore, we advocate mechanical ventilation with 100% O2 during the first 12 to 24 hrs of septic shock. However, controlled clinical trials are mandatory to test the safety and efficacy of this approach.
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