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1

Gastroprotective effects of Prunus laurocerasus L. fruit extracts against the oxidative stress induced by indomethacin in rats

100%

Aydin Berktas O., Keskin A., Gulec Peker E. G.

European Journal of Clinical and Experimental Medicine

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2022

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issue 3

284-289

EN

Introduction and aim. Prunus laurocerasus L. is a perennial plant belonging to the Rosaceae family and is grown on the shores of the Black Sea Region. In the current study, the effect of P. laurocerasus fruits was investigated in the ulcer model created by the application of indomethacin to rats. Material and methods. Rats divided into five groups: fruit water extract (200 mg/kg), fruit ethanol-water extract (200 mg/kg), lansoprazole agent (LAN, 25 mg/kg), and indomethacin (IND, 25 mg/kg). All administrations were given to animals by oral gavage. At the end of the experiment, macroscopic and biochemical measurements were made in rats. Results. The lipid peroxidation was quite high in rat stomach tissues given IND. The applied LAN and extracts reduced this increase to almost a healthy rate. On the other hand, the amount of glutathione, catalase, and superoxide dismutase activities were found very low in IND applied tissues. The LAN and fruit extracts treatments tried to show their protective feature by increasing this decreased antioxidant level in their own groups. Conclusion. The data obtained determined that both enzyme and non-enzyme antioxidant markers measured in fruit extracts had a protective effect almost as strong as lansoprazole.

2

Effect of a medicinal agent, possessing antioxidant and antihypoxant properties, on the state of oxygen homeostasis and lipid peroxidation under experimental pneumoconiosis in albino rats

88%

Olyinyk A., Ślifirczyk A., Nikoniuk M., Celiński M., Domańska, D>

Progress in Health Sciences

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2018

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vol. 8(2)

137-143

EN

Introduction: Pneumoconioses (Pc) are interstitial pulmonary diseases of professional genesis, caused by long-term inhalation of high dust concentrations. Pcafflict 26.6-53% of the workers, exposed to dust contamination. The major feature of Pc course is irrevocability and incurability. Purpose: The research of the effect of ethylmethyl hydroxypyridine succinate, possessing antioxidant and antihypoxant characteristics, on the oxygen metabolism, acid-alkaline state, and lipid peroxidation at the background of experimental pneumoconiosis in albino rats. Material and methods: Pneumoconiosis was simulated on 72 albino rats through endotracheal injection of black coal suspension, on our own modification of O. Yu. Nykolenko methodology. Results: Manifestations of experimental pneumo-coniosis depended on the period of dust inhalation. Development of experimental pneumoconiosis was found to result in the decreased partial oxygen pressure in the arterial blood, compensated hyperventilation-induced respiratory alkalosis, and marked increase in lipid peroxidation activity that could be seen in the blood content of malon-dialdehyde, as well as of conjugated dienes and trienes. Conclusions: Application of ethylmethylhydroxy pyridine succinate in experimental pneumoconiosis has been found to improve oxygen metabolism, acid-alkaline state, and lipid peroxidation that is revealed in normalization of the partial oxygen pressure in the arterial blood, oxygen saturation of haemoglobin, index of bases’ deficiency BE (Ваse-Ехсеss), and in 1.6-2.0 decrease in the content of malondialdehyde, as well as of conjugated dienes and trienes.

3

Occupational health surveillance: pulmonary function testing and oxidative stress among photocopying workers in Pakistan

75%

Javed H., Ghani N., Ghani N., Fatima A.

Medycyna Pracy

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2019

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vol. 70

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issue 4

403-410

EN

Background The photocopying occupation contributes to various health issues in workers. Elevated levels of oxidative stress have been found to be associated with respiratory problems in occupational workers. The intention of the current research is to evaluate the association between the pulmonary function parameters, a biomarker of oxidative stress, and the photocopying occupation in Lahore, Pakistan. Material and Methods The study was performed on a group of photocopying operators (N = 100) and a control group (N = 100). A structured questionnaire was developed to gather the demographic attributes. Lung function testing was done with the spirometer. The blood lipid peroxides level, as thiobarbituric acid reactive substances (TBARS), was assessed spectrophotometrically. Results A statistically significant reduction was found in the pulmonary function parameters as compared to the control group. In the study group, the prevalence of respiratory symptoms, including cough (31%), sneezing (18%), wheezing (9%) and breathing issues (19%), was high as compared to the control group. A significantly higher plasma TBARS concentration was observed in the photocopying workers. A negative correlation prevailed between FVC (−0.081), FVC% predicted (−0.038) and FEV1 (−0.043), and the duration of exposure. Conclusions The study showed that the occupational exposure could have a significant effect on the normal pulmonary function and the oxidative potential of well-being. The profound emissions in the vicinity of photocopying centers may be responsible for the variations in the pulmonary function parameters and oxidative stress. Med Pr. 2019;70(4):403–10

4

Influence of electromagnetic field (1800 MHz) on lipid peroxidation in brain, blood, liver and kidney in rats

75%

Bodera P., Stankiewicz W., Antkowiak B., Paluch M., Kieliszek J., Sobiech J., Niemcewicz M.

International Journal of Occupational Medicine and Environmental Health

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2015

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vol. 28

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issue 4

751-759

EN

Objectives The aim of this study is the evaluation of the influence of repeated (5 times for 15 min) exposure to electromagnetic field (EMF) of 1800 MHz frequency on tissue lipid peroxidation (LPO) both in normal and inflammatory state, combined with analgesic treatment. Material and Methods The concentration of malondialdehyde (MDA) as the end-product of the lipid peroxidation (LPO) was estimated in blood, liver, kidneys, and brain of Wistar rats, both healthy and those with complete Freund’s adjuvant (CFA)-induced persistent paw inflammation. Results The slightly elevated levels of the MDA in blood, kidney, and brain were observed among healthy rats in electromagnetic field (EMF)-exposed groups, treated with tramadol (TRAM/EMF and exposed to the EMF). The malondialdehyde remained at the same level in the liver in all investigated groups: the control group (CON), the exposed group (EMF), treated with tramadol (TRAM) as well as exposed to and treated with tramadol (TRAM/EMF). In the group of animals treated with the complete Freund’s adjuvant (CFA) we also observed slightly increased values of the MDA in the case of the control group (CON) and the exposed groups (EMF and TRAM/EMF). The MDA values concerning kidneys remained at the same levels in the control, exposed, and not-exposed group treated with tramadol. Results for healthy rats and animals with inflammation did not differ significantly. Conclusions The electromagnetic field exposure (EMF), applied in the repeated manner together with opioid drug tramadol (TRAM), slightly enhanced lipid peroxidation level in brain, blood, and kidneys.

5

Impact of electromagnetic radiation emitted by monitors on changes in the cellular membrane structure and protective antioxidant effect of vitamin A – In vitro study

75%

Lewicka M., Henrykowska G., Zawadzka M., Rutkowski M., Pacholski K., Buczyński A.

International Journal of Occupational Medicine and Environmental Health

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2017

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vol. 30

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issue 5

695-703

EN

Objectives The increasing number of devices emitting electromagnetic radiation (EMR) in people’s everyday life attracted the attention of researchers because of possible adverse effects of this factor on living organisms. One of the EMR effect may be peroxidation of lipid membranes formed as a result of free radical process. The article presents the results of in vitro studies aimed at identifying changes in malondialdehyde (MDA) concentration – a marker of lipid peroxidation and antioxidant role of vitamin A during the exposure of blood platelets to electromagnetic radiation generated by liquid-crystal-display (LCD) monitors. Material and Methods Electromagnetic radiation emitted by LCD monitors is characterized by parameters: 1 kHz frequency and 220 V/m intensity (15 cm from display screen). The time of exposure was 30 and 60 min. The study was conducted on porcine blood platelets. The samples were divided into 6 groups: unexposed to radiation, unexposed + vitamin A, exposed for 30 min, exposed for 30 min + vitamin A, exposed for 60 min, exposed for 60 min + vitamin A. Results The MDA concentration in blood platelets increases significantly as compared to control values after 60 min of exposure to EMR. A significant decrease in MDA concentration after the addition of vitamin A was noticed. In the blood samples exposed to EMR for 30 and 60 min the MDA concentration was significantly increased by addition of vitamin A. Conclusions The results show the possibly negative effect of electromagnetic radiation on the cellular membrane structure manifested by changes in malondialdehyde concentration and indicate a possible protective role of vitamin A in this process. Int J Occup Med Environ Health 2017;30(5):695–703

6

Authors’ response (September 1, 2017) to the letter to the Editor concerning the paper “Impact of electromagnetic radiation emitted by monitors on changes in the cellular membrane structure and protective antioxidant effect of vitamin A – In vitro study”

75%

Lewicka M., Henrykowska G., Zawadzka M., Rutkowski M., Pacholski K., Buczyński A.

International Journal of Occupational Medicine and Environmental Health

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2017

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vol. 31

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issue 3

373-375

EN

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7

Technika LC-MS/MS jako metoda oznaczania izoprostanów: krótki przegląd literatury

51%

Król M. B., Brzeźnicki S.

Medycyna Pracy

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2023

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vol. 74

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issue 2

119-125

EN

Isoprostanes are a large group of compounds formed as products of free radical oxidation of polyunsaturated fatty acids, which are isomers of prostaglandin. They are present in all body tissues and biological fluids in quantifiable concentrations. Since 2018, the determination of isoprostanes by chromatographic technique with mass spectrometry is the golden standard of the oxidative stress markers determination in relation to oxidative damage to lipids. The publication is a synthetic review of recently published articles on the use of isoprostanes as a marker of lipid peroxidation determined with the liquid chromatography with tandem mass spectrometry technique. It presents the results of research using isoprostanes as a marker in medicine, in monitoring people working in exposure to harmful substances and in lifestyle research. Med Pr. 2023;74(2)

PL

Izoprostany to duża grupa związków, które budową przypominają prostaglandyny. Powstają jako produkty wolnorodnikowej reakcji utleniania wielonienasyconych kwasów tłuszczowych i występują powszechnie we wszystkich tkankach oraz płynach biologicznych ciała w możliwym do oznaczenia stężeniu. Od 2018 r. oznaczanie izoprostanów techniką wysokosprawnej chromatografii cieczowej lub gazowej sprzężonej ze spektrometrią mas jest uznawane za złoty standard wśród oznaczeń markerów stresu oksydacyjnego w kontekście oksydacyjnych uszkodzeń lipidów. Publikacja jest syntetycznym przeglądem najnowszej literatury dotyczącej wykorzystania izoprostanów jako markera peroksydacji lipidów z użyciem techniki wysokosprawnej chromatografii cieczowej sprzężonej z tandemową spektrometrią mas. Przedstawiono w niej wyniki badań wykorzystujące oznaczanie izoprostanów w pracy klinicystów i wskazano potencjał zastosowania tych oznaczeń do monitoringu osób pracujących w narażeniu na szkodliwe substancje oraz ich przydatność w badaniach dotyczących stylu życia. Med. Pr. 2023;74(2)

Refine search results

Gastroprotective effects of Prunus laurocerasus L. fruit extracts against the oxidative stress induced by indomethacin in rats

Effect of a medicinal agent, possessing antioxidant and antihypoxant properties, on the state of oxygen homeostasis and lipid peroxidation under experimental pneumoconiosis in albino rats

Occupational health surveillance: pulmonary function testing and oxidative stress among photocopying workers in Pakistan

Influence of electromagnetic field (1800 MHz) on lipid peroxidation in brain, blood, liver and kidney in rats

Impact of electromagnetic radiation emitted by monitors on changes in the cellular membrane structure and protective antioxidant effect of vitamin A – In vitro study

Authors’ response (September 1, 2017) to the letter to the Editor concerning the paper “Impact of electromagnetic radiation emitted by monitors on changes in the cellular membrane structure and protective antioxidant effect of vitamin A – In vitro study”

Technika LC-MS/MS jako metoda oznaczania izoprostanów: krótki przegląd literatury