Search results

1

Exhaled breath malondialdehyde, spirometric results and dust exposure assessment in ceramics production workers

100%

Sakhvidi M. J., Biabani Ardekani J., Firoozichahak A., Zavarreza J., Hajaghazade M., Mostaghaci M., Mehrparvar A., Barkhordari A.

International Journal of Occupational Medicine and Environmental Health

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2015

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vol. 28

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issue 1

81-89

EN

Introduction The study aimed at measuring exhaled breath malondialdehyde (EBC-MDA) in workers exposed to dust containing silica and at its comparison with the non-exposed control group. Material and methods The cross sectional, case-control study (N = 50) was performed in a tile and ceramics production factory in Yazd, Iran. EBC-MDA was quantified in exhaled breath of the participants by a lab made breath sampler. Exposure intensity was measured according to the NIOSH 0600 method in selected homogeneous exposure groups. Additionally, spirometry test was conducted to investigate a correlation between EBC-MDA and spirometric findings in the exposed workers. Results There was no difference in the observed exposure intensities of silica containing dust in different units. However, “coating preparation” was the unit with the highest concentration of dust. Although, the level of EBC-MDA in the cases was slightly higher than in the controls, the difference was not statistically significant (U = 252, p = 0.464). A significant and positive correlation was found between dust exposure intensity in working units and the measured EBC-MDA of workers (r = 0.467, N = 25, p = 0.027). There were also no statistically significant differences among job categories in the exposed group for the values of FEV1% (F(3, 44) = 0.656, p = 0.584), FVC% (F(3, 44) = 1.417, p = 0.172), and FEV1/FVC% (F(3, 44) = 1.929, p = 0.139). Conclusions The results showed a significant correlation between respirable dust exposure intensity and the level of EBC-MDA of the exposed subjects. However, our results did not show a significant correlation between lung function decreases and EBC-MDA.

2

Oxidative stress and antioxidants markers in individuals with thyroid hormones dysfunction

100%

Omon E. A., Ajay O. D.

European Journal of Clinical and Experimental Medicine

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2023

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issue 4

768-775

EN

Introduction and aim. Thyroid hormone abnormalities have been associated with oxidative changes in human beings. The aim of the study was to evaluate the oxidative stress marker and antioxidants status in individuals with thyroid hormone dysfunction in Ekiti State. Material and methods. A total of eighty samples were recruited in this study comprising forty subjects with thyroid hormones dysfunction and forty apparently healthy controls. Malondialdehyde (MDA), reduced glutathione (GSH) and catalase were determined spectrophotometerically. Results. MDA was non-significantly higher (p>0.05) in subjects (4.33±0.84 nmol/mL) compared with control (4.12±0.63 nmol/mL), catalase was non-significantly higher (p>0.05) in subjects (199.36±20.21 µm/mL) compared with control (181.55±16.61 µm/mL), while GSH was significantly lower (p<0.05) in subjects (79.31±10.12 µmol/mL) compared with control (127.21±7.29 µmol/mL). Conclusion. It can be concluded that the increase in the reactive oxygen species accompanied with impairment of the antioxidant system occurs in patients with thyroid hormone dysfunction. Hypothyroidism and hyperthyroidism induces disequilibrium of the oxidative/anti-oxidative balance that can lead to subsequent development of inflammation and associated diseases.

3

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

86%

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

86%

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

86%

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”

86%

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

Wpływ kwasu α-liponowego na procesy wolnorodnikowe w surowicy szczurów utrzymywanych na diecie wysokotłuszczowej

58%

Cichoń M., Błaszczyk U., Zalejska-Fiolka J.

Medycyna Pracy

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2017

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vol. 68

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issue 3

391-399

EN

Background Oils are often fried which reduces their beneficial biological and nutritional properties, contributing to disturbances in homeostasis. Some antioxidant substances can improve stability of oils. The aim of the study was to examine the effect of α-lipoic acid (ALA) on the concentration of sulfhydryl groups, lipid peroxides, malondialdehyde, creatinine and urea in serum of rats fed high fat diet for 3 months. Material and Methods Thirty six Wistar rats were equally divided into 6 groups: the control group on standard breeding diet (SB), oxidized oil (OU) group on SB with 10% oxidized oil, ALA10 group on SB with ALA 10 mg/kg of body weight (b.w.), OU+ALA10 group on SB with oxidized oil and ALA (10 mg/kg b.w.), ALA50 group on SB with ALA in a dose of 50 mg/kg b.w., OU+ALA50 group on SB with oxidized oil and ALA (50 mg/kg b.w.). Oil was oxidized in 180°C for 6 h. Results We observed decrease in concentration of protein sulfhydryl (PSH) groups in all study groups except for ALA10 vs. control group (C) and increase in OU+ALA10 and OU+ALA50 vs. OU; increase in the lipid hydroperoxide (LHP) concentration in OU, OU+ALA10 and OU+ALA50 vs. C and decrease in all study groups vs. OU; increase of malondialdehyde (MDA) in OU vs. all other groups. And also increase in creatinine and urea concentration in OU group. Conclusions High fat diet rich in oxidized oil intensifies the lipid peroxidation process and oxidation of sulfhydryl groups. It can also impair kidney function. Administration of lipoic acid in a dose of 10 mg/kg b.w. inhibits the lipid peroxidation and protects sulfhydryl groups. Med Pr 2017;68(3):391–399

PL

Wstęp Proces smażenia olejów roślinnych prowadzi do obniżenia ich właściwości biologicznych i żywieniowych oraz w konsekwencji do zaburzeń homeostazy organizmu. Czynnikami wspomagającym stabilność olejów są substancje o charakterze antyoksydacyjnym. Celem pracy było określenie wpływu kwasu α-liponowego na stężenie grup sulfhydrylowych, nadtlenków lipidowych, dialdehydu malonowego oraz kreatyniny i mocznika w surowicy szczurów utrzymywanych 3 miesiące na diecie wysokotłuszczowej wzbogaconej w olej rzepakowy poddany obróbce wysokotemperaturowej. Materiał i metody Materiał stanowiło 36 szczurów podzielonych równo na 6 grup: kontrolną utrzymywaną na hodowlanej paszy standardowej (hodowlana dieta standardowa – HDS), grupę OU (HDS z 10% dodatku oleju utlenionego (OU)), grupę ALA10 (HDS z dodatkiem kwasu α-liponowego (ALA) w dawce 10 mg/kg masy ciała (mc.)), grupę OU+ALA10 (HDS z dodatkiem utlenionego oleju oraz ALA jw.), grupę ALA50 (HDS z dodatkiem ALA w dawce 50 mg/kg mc.) i grupę OU+ALA50 (HDS z dodatkiem utlenionego oleju oraz ALA jw.). Olej był utleniany w 180°C przez 6 godz. Wyniki Zaobserwowano obniżenie stężenia grup sulfhydrylowych (protein sulfhydryl groups – PSH) dla wszystkich grup badanych vs grupa kontrolna (K) z wyłączeniem grupy ALA10 oraz istotnie wyższe stężenie PSH w grupach OU+ALA10 i OU+ALA50 vs OU; wzrost stężenia nadtlenków lipidowych (lipid hydroperoxide – LHP) dla grup OU, OU+ALA10 i OU+ALA50 vs K z jednoczesnym obniżeniem stężenia LHP dla wszystkich grup badanych vs OU; wzrost stężenia dialdehydu malonowego (malondialdehyde – MDA) w grupie OU względem wszystkich pozostałych grup. Zaobserwowano także podwyższenie stężenia kreatyniny i mocznika w grupie OU. Wnioski Wykazano, że zastosowana dieta nasila proces peroksydacji lipidów oraz powoduje nasilenie utleniania grup sulfhydrylowych. Może także zaburzać czynność nerek. Podawanie z dietą kwasu liponowego w dawce 10 mg/kg mc. skutecznie hamuje proces peroksydacji lipidów oraz ochrania wolne grupy sulfhydrylowe. Med. Pr. 2017;68(3):391–399

Refine search results

Exhaled breath malondialdehyde, spirometric results and dust exposure assessment in ceramics production workers

Oxidative stress and antioxidants markers in individuals with thyroid hormones dysfunction

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”

Wpływ kwasu α-liponowego na procesy wolnorodnikowe w surowicy szczurów utrzymywanych na diecie wysokotłuszczowej