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Frias H, Murga Valderrama NL, Flores Durand GJ, Cornejo VG, Romani AC, Bardales W, Segura GT, Polveiro RC, Vieira DDS, Ramos Sanchez EM, Lopez Lapa RM, Maicelo Quintana JL. Comparative analysis of fasting effects on the cecum microbiome in three guinea pig breeds: Andina, Inti, and Peru. Front Microbiol 2023; 14:1283738. [PMID: 38173670 PMCID: PMC10761435 DOI: 10.3389/fmicb.2023.1283738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
Guinea pigs have historically been used as a food source and are also an important model for studying the human intestines. Fasting is the act of temporarily stopping the intake of food. This process can alter the microbiota of various animals. This study is the first to investigate the impact of fasting on the cecum microbiome of three guinea pig breeds. We investigated the impact of fasting on the microbiome population structure in the cecum of three guinea pig breeds. This was done by sequencing and analyzing the V4 hypervariable region of the 16S rRNA gene in bacterial communities found in cecum mucosa samples. To achieve this, we established two treatment groups (fasting and fed), for each of the three guinea pig breeds: Andina, Inti, and Peru. The study involved twenty-eight guinea pigs, which were divided into the following groups: Andina-fed (five), Andina-fasting (five), Inti-fed (four), Inti-fasting (five), Peru-fed (five), and Peru-fasting (four). The results indicated a significant difference in beta diversity between the treatment groups for the Peru breed (P-value = 0.049), but not for the treatment groups of the Andina and Inti breeds. The dominant phyla across all groups were Firmicutes and Bacteroidetes. We observed variations in the abundance of different taxa in the cecum microbiota when comparing the treatment groups for each breed. Additionally, there was a higher number of unique taxa observed in the fasting groups compared to the fed groups. We discovered that the genus Victivallis was the only one present in all fasting groups across all breeds. Despite the findings, the resilience of the gut microbiome was not challenged in all three breeds, which can lead to disruptive changes that may affect the overall maintenance of the cecum microbiome. Based on the observed differences in the treatment groups of the Peru breed, it can be suggested that fasting has a greater impact on this particular breed.
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Affiliation(s)
- Hugo Frias
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Nilton Luis Murga Valderrama
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Gary J. Flores Durand
- Laboratorio de Fisiología Molecular, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Victor G. Cornejo
- Laboratorio de Fisiología Molecular, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Ana C. Romani
- Laboratorio de Fisiología Molecular, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - William Bardales
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Laboratorio de Enfermedades Infecciosas y Parasitarias, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - G. T. Segura
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Richard C. Polveiro
- Laboratory of Bacterial Diseases, Sector of Preventive Veterinary Medicine and Public Health, Department of Veterinary, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Dielson da S. Vieira
- Department of Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, United States
- Chemistry Department, Institute for Drug Discovery, Purdue University, West Lafayette, IN, United States
| | - Eduardo M. Ramos Sanchez
- Programa de Pós-Graduação em Ciência Animal, Departamento de Zootecnia, Centro de Ciências Agrárias, Universidade Federal da Paraíba, Areia, Brazil
- Facultad de Medicina, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Rainer M. Lopez Lapa
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Laboratorio de Fisiología Molecular, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Medicina, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
| | - Jorge Luis Maicelo Quintana
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Instituto de Investigación en Ganadería y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
- Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Peru
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Achterbergh R, Lammers LA, Kuijsten L, Klümpen HJ, Mathôt RAA, Romijn JA. Effects of nutritional status on acetaminophen measurement and exposure. Clin Toxicol (Phila) 2018; 57:42-49. [DOI: 10.1080/15563650.2018.1487563] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- R. Achterbergh
- Departments of Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - L. A. Lammers
- Hospital Pharmacy, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - L. Kuijsten
- Hospital Pharmacy, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - H. J. Klümpen
- Department of Medical Oncology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
| | - R. A. A. Mathôt
- Hospital Pharmacy, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - J. A. Romijn
- Departments of Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Berbee JK, Lammers LA, Krediet CTP, Fischer JC, Kemper EM. Metabolic acidosis caused by concomitant use of paracetamol (acetaminophen) and flucloxacillin? A case report and a retrospective study. Eur J Clin Pharmacol 2017; 73:1459-1465. [PMID: 28782093 PMCID: PMC5662679 DOI: 10.1007/s00228-017-2311-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/24/2017] [Indexed: 11/26/2022]
Abstract
PURPOSE A patient was identified with severe metabolic acidosis, a high anion gap and 5-oxoproline accumulation, probably caused by the simultaneous use of paracetamol (acetaminophen) and flucloxacillin. We wanted to investigate the necessity to control the interaction between both drugs with an automatic alert system. METHODS To investigate the relevance of the interaction of paracetamol and flucloxacillin, a retrospective study was conducted. Data on paracetamol and flucloxacillin prescriptions and laboratory data (pH, Na+, HCO3-, Cl-, albumin and 5-oxoproline levels) were combined to assess the prevalence of acidosis, calculate the anion gap and analyse 5-oxoproline levels in clinically admitted patients using both drugs simultaneously. RESULTS In the 2-year study period, approximately 53,000 admissions took place in our hospital. One thousand and fifty-seven patients used paracetamol and flucloxacillin simultaneously, of which 51 patients (4.8%) had a serum pH ≤ 7.35. One patient, the same patient as presented in the case report, had a high anion gap and a toxic level of 5-oxoproline. CONCLUSION The prevalence of metabolic acidosis is very low and the only patient identified with the interaction was recognised during normal clinical care. We conclude that automatic alerts based on simultaneous use of paracetamol and flucloxacillin will generate too many signals. To recognise patients earlier and prevent severe outcomes, a warning system (clinical rule) based on paracetamol, flucloxacillin and pH measurement may be helpful. Early calculation of the anion gap can narrow the differential diagnosis of patients with metabolic acidosis and measurement of 5-oxoproline can explain acidosis due the interaction of paracetamol and flucloxacillin.
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Affiliation(s)
- J K Berbee
- Department of Hospital Pharmacy, Academic Medical Centre, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands
| | - L A Lammers
- Department of Hospital Pharmacy, Academic Medical Centre, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands
| | - C T P Krediet
- Department of Internal Medicine, Academic Medical Centre, Amsterdam, the Netherlands
| | - J C Fischer
- Department of Clinical Chemistry, Academic Medical Centre, Amsterdam, the Netherlands
| | - E M Kemper
- Department of Hospital Pharmacy, Academic Medical Centre, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands.
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Abstract
Nephrogenesis in the rat starts mid-gestation and continues into lactation. Maternal low protein (LP) intake leads to renal injury in rats and associates with mild renal injury in humans. We hypothesized that LP during early nephrogenesis or throughout gestation would induce more renal injury in rat offspring than when LP was only present before nephrogenesis. Pregnant rats were fed LP diet (9% casein) at early gestation (LPE, day 0-7), mid (LPM, day 8-14), late (LPL, day 15-22) or throughout gestation (LPA, day 0-22) and compared to controls on 18% casein diet. Offspring were studied at 18 months. Renal injury was assessed by 24 h proteinuria, plasma urea, antioxidant enzyme activities, and apoptosis (Bax/Bcl2). Proteinuria was higher in LPM males and LPE and LPM females. In LPM males glutathione peroxidase activity was lower, while in LPE males catalase activity was higher. Antioxidants were not much affected in females. Bax expression was higher in LPM males and females, while Bcl2 expression was higher in LPA females. Thus even before nephrogenesis (day 0-7), LP impacted on renal integrity in adult life, while LP during a later phase (day 15-22) or throughout gestation had less effect. In summary, for aging rat kidney LP poses the greatest threat when restricted to early nephrogenesis.
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Kozer E, Greenberg R, Zimmerman DR, Berkovitch M. Repeated supratherapeutic doses of paracetamol in children--a literature review and suggested clinical approach. Acta Paediatr 2006; 95:1165-71. [PMID: 16982484 DOI: 10.1080/08035250600580503] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
UNLABELLED The safety of paracetamol when given in the recommended dosage is well documented. However, in recent years there have been many reports of liver failure associated with repeated exposure to supratherapeutic doses of paracetamol. This paper reviews the literature on chronic supratherapeutic paracetamol exposure in children and the different dosing guidelines. Based on which, we suggest the following approach: liver injury secondary to repeated dosing of paracetamol should be considered when a child has received more than 75 mg/kg/d for at least 2 d, or if risk factors for paracetamol toxicity have been identified. Liver transaminases, coagulation factors, and paracetamol serum concentrations should be measured in these children and in symptomatic children with vomiting, right upper quadrant abdominal pain, and jaundice who have taken paracetamol. Treatment with N-acetyl cysteine should be started regardless of paracetamol concentrations if transaminases or INR are elevated. CONCLUSION Liver injury secondary to repeated dosing of paracetamol is rare but may result in severe morbidity and mortality. The cumulative dose of paracetamol should not exceed 75 mg/kg/d. Children treated with higher doses for more than 2 d should be evaluated for possible liver injury and treated with N-acetyl cysteine if evidence of liver injury is found.
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Affiliation(s)
- Eran Kozer
- Pediatric Emergency Medicine, Assaf Harofeh Medical Center, Zerifin, Israel.
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Harper JM, Salmon AB, Chang Y, Bonkowski M, Bartke A, Miller RA. Stress resistance and aging: influence of genes and nutrition. Mech Ageing Dev 2006; 127:687-94. [PMID: 16713617 PMCID: PMC2923407 DOI: 10.1016/j.mad.2006.04.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2006] [Revised: 04/03/2006] [Accepted: 04/12/2006] [Indexed: 11/19/2022]
Abstract
Previous studies have shown that dermal fibroblast cell lines derived from young adult mice of the long-lived Snell dwarf (dw/dw), Ames dwarf (df/df) and growth hormone receptor knockout (GHR-KO) mouse stocks are resistant, in vitro, to the cytotoxic effects of hydrogen peroxide, cadmium, ultraviolet light, paraquat, and heat. Here we show that, in contrast, fibroblasts from mice on low-calorie (CR) or low methionine (Meth-R) diets are not stress resistant in culture, despite the longevity induced by both dietary regimes. A second approach, involving induction of liver cell death in live animals using acetaminophen (APAP), documented hepatotoxin resistance in the CR and Meth-R mice, but dw/dw and GHR-KO mutant mice were not resistant to this agent, and were in fact more susceptible than littermate controls to the toxic effects of APAP. These data thus suggest that while resistance to stress is a common characteristic of experimental life span extension in mice, the cell types showing resistance may differ among the various models of delayed or decelerated aging.
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Affiliation(s)
- James M Harper
- Department of Pathology and Geriatrics Center, University of Michigan School of Medicine, Ann Arbor, MI, United States.
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Langley-Evans SC, Sculley DV. Programming of hepatic antioxidant capacity and oxidative injury in the ageing rat. Mech Ageing Dev 2005; 126:804-12. [PMID: 15888335 DOI: 10.1016/j.mad.2005.03.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2004] [Revised: 12/16/2004] [Accepted: 03/02/2005] [Indexed: 12/12/2022]
Abstract
Exposure to undernutrition in fetal life increases the susceptibility of humans and animals to major disease states in adult life. Studies of rodents exposed to protein restriction during fetal life indicate that lifespan is reduced, a finding that is the opposite of the well-documented improvement in longevity noted with post-weaning caloric restriction. The maternal low-protein (MLP) model of rat pregnancy therefore provides a suitable vehicle to consider how nutrition in fetal life may programme mechanisms of ageing. Pregnant rats were fed control (n = 7) or MLP diet (n = 7) throughout pregnancy. At birth, increased oxidation of hepatic proteins was noted, and this appeared related to activity of glutathione reductase. Older offspring were studied at 4, 16, 30 and 44 weeks of age and analyses revealed that MLP exposure in utero produced sex-specific differences in oxidant:antioxidant balance. In male offspring, MLP increased protein carbonyl concentrations in the liver (P = 0.013) and increased glutathione peroxidase activity (P = 0.018). These programmed changes were absent in the female offspring. The data support the hypothesis that reduced lifespan in rats subject to prenatal protein restriction is a consequence of enhanced oxidative processes promoting apoptosis and loss of tissue function. Mechanisms of ageing appear to be subject to nutritional programming during early development.
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Affiliation(s)
- Simon C Langley-Evans
- Centre for Reproduction and Early Life, School of Biosciences, University of Nottingham, Sutton Bonington, Loughborough, UK.
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Jackson AA, Gibson NR, Lu Y, Jahoor F. Synthesis of erythrocyte glutathione in healthy adults consuming the safe amount of dietary protein. Am J Clin Nutr 2004; 80:101-7. [PMID: 15213035 DOI: 10.1093/ajcn/80.1.101] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The finding that plasma glutathione turnover decreases as dietary protein intake decreases suggests that the safe amount of dietary protein, although sufficient for maintenance of nitrogen balance, may be insufficient for maintenance of cellular glutathione. OBJECTIVE Our objective was to determine the effect of the safe protein intake on the erythrocyte glutathione synthesis rate and its relation with urinary 5-L-oxoproline excretion. DESIGN Erythrocyte glutathione synthesis and urinary 5-L-oxoproline excretion were measured in young adults (6 men and 6 women) by using an infusion of [(13)C(2)]glycine on 3 occasions: initially during the subjects' habitual protein intake (1.13 g.kg(-1).d(-1)) and on days 3 and 10 of consumption of a diet providing the safe protein intake (0.75 g.kg(-1).d(-1)). RESULTS Compared with baseline values, the fractional synthesis rate of erythrocyte glutathione was significantly lower (P < 0.05) on days 3 and 10 of the diet with the safe protein intake. Urinary 5-L-oxoproline excretion increased significantly (P < 0.05) above baseline by the third day of the diet with the safe protein intake and remained elevated. Erythrocyte glutathione concentrations and absolute synthesis rates decreased by day 3 but recovered to baseline values by day 10. Erythrocyte concentrations of cysteine, methionine, and serine remained unchanged, whereas erythrocyte concentrations of glycine, glutamic acid, and glutamine increased significantly by day 10. CONCLUSION During adaptation to the safe amount of dietary protein, there are changes in the concentration and kinetics of erythrocyte glutathione that suggest a reduced antioxidant capacity and possible increased susceptibility to oxidant stress.
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Affiliation(s)
- Alan A Jackson
- Institute of Human Nutrition, University of Southampton, Southampton General Hospital, Southampton, United Kingdom.
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Abstract
Paracetamol (acetaminophen) is one of the most frequently used analgesics, and is the most commonly used substance in self-poisoning in the US and UK. Paracetamol toxicity is manifested primarily in the liver. Treatment with N-acetyl-cysteine (NAC), if started within 10 hours from ingestion, can prevent hepatic damage in most cases. Pharmacokinetic data relating plasma paracetamol concentration to time after ingestion have been used to generate a 'probable hepatoxicity line' to predict which cases of paracetamol overdose will result in hepatotoxicity and should be treated with NAC. However, later studies use a 25% lower line as their 'possible hepatotoxicity line'. Although adopting the original line may save considerable resources, further studies are needed to determine whether such an approach is safe. On the basis of the metabolism of paracetamol, several risk factors for paracetamol toxicity have been proposed. These risk factors include long term alcohol (ethanol) ingestion, fasting and treatment with drugs that induce the cytochrome P450 2E1 enzyme system. Although some studies have suggested that these risk factors may be associated with worse prognosis, the data are inconclusive. However, until further evidence is available, we suggest that the lower line should be used when risk factors are present. In Canada and the UK, the intravenous regimen for NAC is used almost exclusively; in the US, an oral regimen is used. Both regimens have been shown to be effective. There is no large scale study with direct comparison between these 2 therapeutic protocols and controversy still exists as to which regimen is superior. During the last few years there has been an increase in the number of reports of liver failure associated with prolonged paracetamol administration for therapeutic reasons. The true incidence of this phenomenon is not known. We suggest testing liver enzyme levels if a child has received more than 75 mg/kg/day of paracetamol for more than 24 hours during febrile illness, and to treat with NAC when transaminase levels are elevated. Paracetamol overdose during pregnancy should be treated with either oral or intravenous NAC according to the regular protocols in order to prevent maternal, and potentially fetal, toxicity. Unless severe maternal toxicity develops, paracetamol overdose does not appear to increase the risk for adverse pregnancy outcome.
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Affiliation(s)
- E Kozer
- Division of Clinical Pharmacology and Toxicology, The Hospital for Sick Children, Toronto, Ontario, Canada.
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Factor P, Ridge K, Alverdy J, Sznajder JI. Continuous enteral nutrition attenuates pulmonary edema in rats exposed to 100% oxygen. J Appl Physiol (1985) 2000; 89:1759-65. [PMID: 11053323 DOI: 10.1152/jappl.2000.89.5.1759] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Adult rats exposed to hyperoxia develop anorexia, weight loss, and a lung injury characterized by pulmonary edema and decreased lung liquid clearance. We hypothesized that maintenance of nutrition during hyperoxia could attenuate hyperoxia-induced pulmonary edema. To test this hypothesis, we enterally fed adult male Sprague-Dawley rats via gastrostomy tubes and exposed them to oxygen (inspired O(2) fraction >0.95) for 64 h. In contrast to controls, enterally fed hyperoxic animals did not lose weight and had smaller pleural effusions and wet-to-dry weight ratios (a measure of lung edema) that were not different from room air controls. Enterally fed rats exposed to hyperoxia had increased levels of mRNA for the Na(+)-K(+)-ATPase alpha(1)- and beta(1)-subunits and glutathione peroxidase. These findings suggest that maintenance of nutrition during an oxidative lung injury reduces lung edema, perhaps by allowing for continued expression and function of protective proteins such as the Na(+)-K(+)-ATPase.
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Affiliation(s)
- P Factor
- Pulmonary and Critical Care Medicine, Evanston Northwestern Healthcare, Evanston 60201, Illinois, USA.
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Chessex P, Lavoie JC, Laborie S, Vallée J. Survival of guinea pig pups in hyperoxia is improved by enhanced nutritional substrate availability for glutathione production. Pediatr Res 1999; 46:305-10. [PMID: 10473045 DOI: 10.1203/00006450-199909000-00009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The imbalance between high oxidant loads and immature antioxidant defenses is associated with long-term complications of prematurity. Glutathione is a central element among the antioxidants. Depletion of pulmonary glutathione accelerates the development of oxygen-induced lung injury in neonatal animal models. After the observation that newborn infants exposed to oxygen have low glutathione levels, a study was designed to test the hypothesis that in neonates from a species susceptible to oxygen toxicity, the lethal effect of hyperoxia is related to a low availability of substrates for glutathione production rather than an impairment in synthetic activity. One-day-old guinea pigs, randomly assigned to room air or oxygen (>95%), were fed by their mothers (n = 16) or i.v. by dextrose (n = 14) or by total parenteral nutrition (TPN, n = 20). After 3 d, glutathione and activities of enzymes involved in maintaining intracellular glutathione levels were determined in lungs and liver. The lethal effect of oxygen (p < 0.05) observed in animals without TPN was not related to glutathione depletion, as oxygen induced a 33% increase in lung glutathione, positively correlated (r2 = 0.35) with enhanced synthesis. With TPN, the animals were protected against the lethal effects of hyperoxia and lung glutathione increased by 67% in oxygen. The results suggest that the glutathione demand by the lungs in the presence of an oxidant stimulus was met by the increased (p < 0.001) hepatic production supported by TPN. Under hyperoxic conditions, early nutritional support is of vital importance.
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Affiliation(s)
- P Chessex
- Research Center, Hôpital Ste-Justine, Department of Pediatrics, University of Montreal, Quebec, Canada
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Gönül B, Kaplan B. Effects of vitamin C supplementation on plasma antioxidant status in unfed periods. GENERAL PHARMACOLOGY 1999; 32:195-9. [PMID: 10188619 DOI: 10.1016/s0306-3623(98)00195-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
In this study, the antioxidant protection of ascorbic acid (AA) supplementation during different unfed periods (24, 48, 120 h) was determined with blood lipid peroxidation level (thiobarbituric acid reactive substances, TBARS) and compared with plasma antioxidant sulfydryl group (RSH) content. Weight loss was induced by increasing the unfed period together with vitamin C supplementation. Blood AA levels decreased by starvation but increased by vitamin C supplementation. RSH content in plasma also decreased with the unfed period; these decreases became apparent by vitamin C supplementation. TBARS formation increased significantly by AA supplementation in the 120-h starvation period.
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Affiliation(s)
- B Gönül
- Department of Physiology, Gazi University Faculty of Medicine, Beşevler, Ankara, Turkey
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Papadopoulos MC, Koumenis IL, Yuan TY, Giffard RG. Increasing vulnerability of astrocytes to oxidative injury with age despite constant antioxidant defenses. Neuroscience 1998; 82:915-25. [PMID: 9483545 DOI: 10.1016/s0306-4522(97)00320-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This paper investigates the vulnerability of astrocytes to oxidative injury as a function of age in culture in mice. Primary murine cortical astrocyte cultures of different ages were exposed to H2O2, combined oxygen-glucose deprivation or glucose deprivation. Astrocytes became more vulnerable to damage from each injury paradigm with age, showing transitions between 15 and 22 days. Both the antioxidant glutathione and superoxide dismutase activity increased after 30 days in culture, while catalase activity did not change up to 34 days. When the decrease in glutathione with injury was measured, young cells showed no change with H2O2 and decreases of < 20% after oxygen-glucose deprivation or glucose deprivation, while older cultures lost > 50% of their glutathione with the same insults. Since iron can be a catalyst for hydroxyl radical formation, we stained cultures and found both iron staining and ferritin immunoreactivity increased with age. Increased iron correlated with protection by deferoxamine against H2O2 injury. The three injury paradigms each had a unique pattern of protection by antioxidants. Dimethylthiourea, a hydrophilic antioxidant, protected from all three insults. Trolox, a lipophilic antioxidant, protected older astrocytes from oxygen-glucose deprivation and glucose deprivation. Deferoxamine provided near complete protection from H2O2, partial protection from oxygen-glucose deprivation and no protection from glucose deprivation. As evidence of increasing oxidative stress, lipid peroxidation resulting from oxygen-glucose deprivation increased with age, assessed with cis-parinaric acid. The increasing sensitivity of ageing astrocytes to oxidative injury occurs while antioxidant defenses are maintained. Increased sensitivity to H2O2 or oxygen-glucose deprivation correlates with iron accumulation.
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Affiliation(s)
- M C Papadopoulos
- Department of Anesthesia, Stanford University School of Medicine, CA 94305, USA
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Abstract
OBJECTIVE Because the hydroxyl radical is capable of oxidizing phenylalanine to O-tyrosine, we sought to determine whether increased levels of O-tyrosine are found in urine of infants treated with supplemental oxygen. METHODS A total of 39 consecutively admitted neonates to an intensive care unit were included. Twenty-seven received supplemental oxygen therapy for respiratory disease, and 12 did not. Urinary O-tyrosine levels were determined on two or more occasions using high-performance liquid chromatography with results expressed as a percentage of the urinary phenylalanine concentration. Using simple and stepwise multiple linear regression analyses, urinary O-tyrosine was examined for associations with relevant clinical conditions and laboratory measurements. RESULTS Infants supplemented with oxygen showed significantly higher mean +/- SEM urinary O-tyrosine levels (0.40% +/- 0.028) compared with those remaining in room air (0.18% +/- 0.012). Mean daily FIO2 was the clinical and laboratory variable most highly correlated with urinary O-tyrosine (r = 0.66). In the stepwise regression, significant associations were also found for renal fractional sodium excretion and Apgar score at 5 minutes. CONCLUSIONS Hydroxylation at the O position of phenylalanine, a specific direct marker for the hydroxyl radical attack, was strongly associated with oxygen treatment in neonates. This finding increases our understanding of the pathogenesis of oxygen injury and suggests a basis for developing therapeutic approaches.
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Affiliation(s)
- G Lubec
- Department of Pediatrics, Division of Neonatology, University of Vienna, Vienna, Austria
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15
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Reeds PJ, Burrin DG, Stoll B, Jahoor F, Wykes L, Henry J, Frazer ME. Enteral glutamate is the preferential source for mucosal glutathione synthesis in fed piglets. THE AMERICAN JOURNAL OF PHYSIOLOGY 1997; 273:E408-15. [PMID: 9277395 DOI: 10.1152/ajpendo.1997.273.2.e408] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To measure the source and rate of mucosal glutathione (GSH) synthesis, fed piglets (28 days old; 7.7 kg) received a 6-h infusion of intragastric [U-13C]glutamate (n = 11) either with (n = 5) or without (n = 6) an intragastric infusion of [1-13C]glycine (0-6 h) and [1,2-13C2(U-13C)]glycine (3-6 h). Eighty-four percent of the labeled mucosal GSH-glutamate and 86% of the luminal GSH-glutamate was 13C5. The tracer-to-tracee ratio of GSH-[U-13C]glutamate was 75% of that of mucosal glutamate. Sixty percent of the labeled mucosal glutamate was 13C1, 13C2, or 13C3, but the tracer-to-tracee ratios of these isotopomers in GSH-glutamate were not significantly different from zero. After 3 h of infusion, the tracer-to-tracee ratio of GSH-[U-13C]glycine was 46%, and after 6 h of infusion GSH-[13C1]glycine was 82% of that of mucosal glycine. This suggested that the half-life of mucosal GSH was 2.7 +/- 0.1 h. We concluded that, in fed piglets, mucosal GSH-glutamate derived largely from the direct metabolism of enteral glutamate rather than from glutamate that was metabolized within the mucosa.
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Affiliation(s)
- P J Reeds
- United States Department of Argriculture/Agriculture Research Service Children's Nutrition Research Center, Houston, Texas, USA
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16
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Langley-Evans SC, Phillips GJ, Jackson AA. Fetal exposure to low protein maternal diet alters the susceptibility of young adult rats to sulfur dioxide-induced lung injury. J Nutr 1997; 127:202-9. [PMID: 9039819 DOI: 10.1093/jn/127.2.202] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The maternal diet is an important determinant of glutathione-related metabolism in rats. Glutathione (GSH) may play a major role in the detoxification of sulfur dioxide (SO2) within the lungs. The effects of fetal exposure to a low protein maternal diet upon later susceptibility to pulmonary injury induced by chronic SO2 exposure were evaluated in young adult rats. Pregnant rats were fed purified diets containing 180 g casein/kg (control diet) or 120, 90 or 60 g casein/kg (experimental diets). After parturition, all dams were fed a standard non-purified diet (189 g protein/kg diet). The pups thus differed only in terms of protein nutrition during gestation. At seven wk of age the male pups were housed in either room air or 286 microg SO2/m3 for 5 h/d during a 28-d period. At the end of the final SO2 treatment period, the rats exposed to 90 or 60 g casein/kg diets in utero exhibited significantly greater pulmonary injury, as assessed by bronchoalveolar lavage, than did those exposed to control diet in utero. Significant maternal diet-induced differences in activities of enzymes of the gamma-glutamyl cycle were noted in the lungs and livers of rats which had not undergone SO2 treatment. Furthermore, the response of these enzyme activities to SO2 treatment was determined by prior exposure to the maternal diet. SO2-treated rats exposed to control diet (180 g casein/kg) and low protein diet (60 g casein/kg), but not those exposed to 120 or 90 g casein/kg diets, tended to augment the activities, relative to rats not treated with SO2, of enzymes which maintain tissue GSH status either through synthesis or recycling. Differences in susceptibility to SO2-induced tissue injury may be related to programming of GSH metabolism by the maternal diet. Alternatively, impaired immune and acute phase responses to an inflammatory insult may account for a failure to resolve initial SO2-induced injury in rats exposed to low protein maternal diets.
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17
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Laster MJ, Gong D, Kerschmann RL, Eger EI, Martin JL. Acetaminophen predisposes to renal and hepatic injury from compound A in the fasting rat. Anesth Analg 1997; 84:169-72. [PMID: 8989019 DOI: 10.1097/00000539-199701000-00030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Results of previous studies of Compound A, a degradation product of sevoflurane, suggested that decreases in glutathione stores may increase potential Compound A nephrotoxicity. By depleting these stores, fasting and various drugs may augment such nephrotoxicity. To test this possibility, we pretreated fasted Fisher rats with intraperitoneal 0 (vehicle only), 250, 500, or 1000 mg/kg of acetaminophen, a commonly used drug that depletes glutathione stores. After pretreatment, we administered Compound A for 3 h at concentrations ranging from 0 to 200 ppm. The larger doses of acetaminophen predisposed to greater renal and hepatic injury. For example, at 100 ppm Compound A, no rats had renal cortical injury when given vehicle only or 250 mg/kg acetaminophen, but 90% (9 of 10 rats) had injury at 500 mg/kg and 100% (13 of 13) at 1000 mg/kg. Similarly, at 100 ppm Compound A, hepatic injury was not evident with vehicle only or 250 mg/kg, but occurred in 30% of rats at 500 mg/kg, and in 69% at 1000 mg/kg. Given the considerable differences between humans and rats, and given the large doses of acetaminophen required, the clinical relevance of these findings is unclear. If clinically relevant, circumstances producing glutathione depletion (e.g., ingestion of drugs such as acetaminophen, or nutritional deficiencies) may predispose to renal or hepatic injury from Compound A in patients given sevoflurane at low fresh gas flow rates.
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Affiliation(s)
- M J Laster
- Department of Anesthesia, University of California, San Francisco 94143-0464, USA
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18
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Laster MJ, Gong D, Kerschmann RL, Eger EI, Martin JL. Acetaminophen Predisposes to Renal and Hepatic Injury from Compound A in the Fasting Rat. Anesth Analg 1997. [DOI: 10.1213/00000539-199701000-00030] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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19
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Langley-Evans SC, Phillips GJ, Jackson AA. Sulphur dioxide: a potent glutathione depleting agent. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART C, PHARMACOLOGY, TOXICOLOGY & ENDOCRINOLOGY 1996; 114:89-98. [PMID: 8760604 DOI: 10.1016/0742-8413(96)00012-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Sulphur dioxide (SO2) is an air pollutant implicated in the initiation of asthmatic symptoms. Glutathione (GSH) has been proposed to play a role in detoxification of SO2 through the sulfitolysis of glutathione disulphide (GSSG) to S-sulphoglutathione (GSSO3-). Rats were exposed to concentrations of SO2 between 5 and 100 ppm for 5 hr a day between 7 and 28 days. Lung injury as assessed by bronchoalveolar lavage and tissue GSH status were evaluated. SO2 5 ppm failed to elicit any lung injury or inflammatory response but did deplete GSH pools in lung, liver, heart and kidney. Activities of gamma-glutamylcysteine synthetase (GCS), glutathione peroxidase (GPx), glutathione S-transferase (GST) and glutathione reductase (GRed) in lung were lowered relative to those in control animals. In liver, GRed activity was decreased. SO2 50 ppm exposure also failed to elicit injury or inflammation but did lower inflammatory cell numbers in the circulation. Rats exposed to 50 ppm SO2 maintained tissue GSH status, but activities of GCS, GPx, GRed and gamma-glutamyltranspeptidase in lung and hepatic GRed and GPx were significantly lower than in control rats. Unaltered GST activity in lung and liver was suggestive of an impairment of the sulfitolysis reaction in these animals, perhaps through lower substrate flux through the GPx reaction, as GSSO3- is a known inhibitor of GST in the rat. Rats exposed to 100 ppm SO2 exhibited evidence of inflammation (120-fold increase in neutrophil numbers recovered in lavage fluid) and like the 5 ppm exposed rats had lower tissue GSH concentrations and GSH-related enzyme activities in lung. We conclude that sulfitolysis of GSSG does occur in vivo during SO2 exposure and that SO2, even in the absence of pulmonary injury, is a potent glutathione depleting agent.
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20
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Benuck M, Banay-Schwartz M, DeGuzman T, Lajtha A. Effect of food deprivation on glutathione and amino acid levels in brain and liver of young and aged rats. Brain Res 1995; 678:259-64. [PMID: 7620894 DOI: 10.1016/0006-8993(95)00204-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The effect of short-term food deprivation on glutathione (GSH) and amino acid levels in brain regions of young and aged rats was compared with changes observed in liver. Animals aged 3 months and 24 months were deprived of food for 48 h. GSH and amino acid levels from cerebral cortex, cerebellum, pons medulla, and liver were assayed and compared with levels in animals of the same age fed normal diets. In liver in both young and old rats, GSH levels fell 30%, from 13 mumol/g tissue to 8.7 mumol/g tissue. Significant changes were observed in other amino acids, including an increase of 30-50% in methionine, glycine, and glutamine, and a decrease of 30-50% in alanine in liver of both young and aged rats, and a 4-fold increase in taurine in young. In brain, little change was observed upon food deprivation. No decrease was observed in GSH, and only small changes were observed in other amino acids. In the aged animal aspartate, glutamate, and alanine levels were slightly lower; tyrosine in cerebellum was reduced by 30%, and both glycine and tyrosine in the pons medulla were reduced by 20-30%. In the brain areas examined, levels of GSH ranged from 1-2 mumol/g in young and 0.8-1.4 mumol/g in old; with levels in pons medulla being lower than those in cerebral cortex. In brain, in contrast to liver, levels were scarcely affected by short-term food deprivation.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M Benuck
- Nathan S. Kline Institute for Psychiatric Research, Center for Neurochemistry, Orangeburg, NY 10962, USA
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21
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Le Couteur DG, Rivory LP, Pond SM. Glucose transport and hypoxia-reoxygenation injury in the perfused rat liver. J Gastroenterol Hepatol 1994; 9:385-90. [PMID: 7948821 DOI: 10.1111/j.1440-1746.1994.tb01260.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
During liver transplantation, oxidative stress occurs during hypoxia and reoxygenation of the donor organ. Chemical oxidative stress impairs cell membrane transport. Therefore, in this study the influence of hypoxia and reoxygenation on hepatocellular membrane transport was investigated. Specifically, glucose transport was studied in the perfused rat liver using the multiple indicator-dilution technique. First, it was observed that in normal rat livers, glucose transport was rapid but saturable (Km 48 +/- 10 mmol/L and Vmax 9.4 +/- 0.9 mumol/s per g of liver). To stimulate hypoxia and reoxygenation, livers were perfused for 30 min with nitrogen-saturated buffer and then with oxygen-saturated buffer for 20 min. The livers from fed rats were protected from hypoxia-reoxygenation injury whereas those from fasted rats were highly susceptible to injury as determined by lactate dehydrogenase release. After reoxygenation, the rate of glucose influx decreased significantly by approximately 50% in the fasted livers (P < 0.001) but was unaffected in the fed livers. This impairment of the hepatocellular transport of glucose, which could be secondary to oxidative injury to the hepatocyte membrane, has implications for the function of donor livers that have sustained hypoxia-reoxygenation ('preservation') injury during transplantation.
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Affiliation(s)
- D G Le Couteur
- University of Queensland Department of Medicine, Brisbane, Australia
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