Introduction. Air suspended particulate matter (SPM) directly influence on the human respiratory system. Dispersion is one of the characteristics of SPM determining their pathogenicity. Alveolar macrophages (AMs) produce reactive oxygen species in response to an exposure that may lead to oxidative stress. The aim of the study. To assess the contribution of the glutathione antioxidant system to the protection of AMs from oxidative stress induced by air SPMs in Vladivostok’s districts with various man-made loads. Material and methods. AMs were isolated from bronchoalveolar lavage of 17 Wistar rats. AMs were exposed by model suspensions (MS) for 2 days. MSs were identical air composition of Vladivostok’s districts with insignificant (MS № 1) and high (MS № 2) technogenic load. MS № 1 contained 22% of particles with a diameter of less than 10 µm. MS № 2 contained 70% of particles with a diameter smaller than 10 μm. The levels of malondialdehyde, glutathione and total antioxidant activity in cell culture and culture fluid were determined. Results. The gain in the proportion of fine and ultrafine particles in MS № 2 has been established to lead to an increase in lipid peroxidation in AMs and a compensatory elevation in the antioxidant activity. The elevation of oxidized glutathione concentration in cell culture indicates the intensification of hydroperoxide detoxification by AMs. The reduction of reduced glutathione exocytosis supports intracellular antioxidant processes. Conclusion. An increase in the fraction of fine and ultrafine particles in the air appears to shift AM redox balance towards oxidative stress, contributing to the formation and the progression of pathological disorders.
The surface layer of the urban atmosphere significantly affects human health. Its quality depends on the level of air pollution. The aim was to determine the size distribution of suspended particulate matters (SPMs) in the atmospheric surface layer of Vladivostok city and to assess the response of the blood immune and metabolic parameters of the population with bronchopulmonary pathology. Sampling of SPMs was conducted in the continental zone of the city with a high level of technogenic pollution (138 samples) and the island part of the city with an insignificant level of technogenic pollution (132 samples). The SPM fractional composition was analyzed by laser granulometry. We examined patients with bronchopulmonary pathology living in a one-kilometer zone centered on sampling area for at least 5 years (continental territory—220 patients, island territory—176 patients). We calculated the D% index characterizing the integral response of the blood immune and metabolic parameters to the exposure of dust fractions. It was found that PM > 10 (mainly of a natural origin) predominate in the island zone with insignificant level of technogenic pollution. The PM10 fraction prevails in the area with a high level of technogenic pollution. The response of the immune and metabolic systems to the exposure to microparticles in population living in the marine and forest/park zone of the island indicates a health-improving effect of the area. Low values of D% were detected for the patients living in the area with a high air pollution level, indicating a pathogenic reaction of immune and prooxidant-oxidative systems.
Introduction. The components and dimensions of suspended particulate matter (SPM) depend on territory, the sources of generation. The aim is to assess the relationship between the quality and dispersed composition of atmospheric SPMs with oxidative and antioxidant processes in alveolar macrophages. Materials and methods. The impact of actual multi component pollution of the surface layer of atmospheric air on alveolar macrophages (AMs) of Wistar rats was modelled. Correlations between the characteristics of AMs and pollution were assessed using the Spearman correlation coefficient. Results. The predominant contribution of the quality characteristics of SPM has been founded. The effect of the dispersed composition increases with an increase of the finely dispersed particles fraction. Metal particles have caused oxidative damage to lipids, with the formation of stable lipid products. The antioxidant system (AOS) has been characterized by the activation of compensatory response. Mineral components have caused irreversible oxidative damage to lipid and protein compounds, activating the thioredoxin formation. Soot particles have showed the most pathogenic effect, leading to oxidative damage to lipids, proteins, and nucleic acids. The AOS stress was accompanied by an increase in the formation of oxidized glutathione and thioredoxin, which performs restoration of proteins and DNA. Limitations. Our study characterizes the response of the AMs of a particular territory. Conclusion. The established tendencies characterize the impact of composition of SPMs of the urban atmospheric on AMs. The study made it possible to identify the most sensitive criteria for the response of AMs upon contact with atmospheric SPMs (thioredoxin, protein carbonyl, 8-hydroxy-2’-deoxyguanosine).
Atmospheric air quality is a crucial factor in the health of human populations. Suspended particulate matter (SPM) is one of the most dangerous components polluting urban air. The aim of the present article is to study the effect of model suspensions (MS) of SPM that are characteristic of the composition of atmospheric air at locations with various anthropogenic loads on redox processes in alveolar macrophages (AM). Atmospheric air sampling was carried out in the breathing zone according to the method developed by one of the authors. AM were isolated from bronchoalveolar lavage fluid of experimental animals. The MS of SPM were prepared in accordance with the actual air pollution: MS No. 1 corresponded to an area with a low man-made load, and MS No. 2 corresponded to an area with a high man-made load. Load tests with model suspensions were carried out for 2 days. Parameters of oxidant processes and antioxidant system (AOS) were determined in cells and culture media. The proportion of the influence of the qualitative and dispersed composition of MS and the indicator of intra-system tension were calculated based on correlation dependencies. The atmospheric air with a high man-made load was dominated by particles up to 10 µm, whereas air with an insignificant man-made load contained SPM of more than 10 µm in size. Unidirectional changes were observed due to an exposure to both model suspensions, but the most pronounced oxidative modifications of lipids, proteins and genetic structures were caused by the exposure to MS No. 2. When exposed to MS No. 1, the AOS maintained the redox balance at the physiological level, localizing the resulting destruction inside the cells. MS No. 2 caused the redox balance to shift towards oxidants, potentiating the generalization of the destruction process. An increase in the content or a longer stress-inducing effect of PM2.5 causes a depletion in the reserve capacity of the AOS and the transition of destruction processes to the systemic level, which contributes to the development of the preconditions for environmentally dependent pathology.
Владивостокский филиал Федерального государственного бюджетного научного учреждения «Дальневосточный научный центр физиологии и патологии дыхания»-Научно-исследовательский институт медицинской климатологии и восстановительного лечения, 690105, г. Владивосток, ул. Русская 73г Контактная информация Людмила Сергеевна Барскова, аспирант, младший научный сотрудник, лаборатория медицинской экологии и рекреационных ресурсов, Владивостокский филиал Федерального государственного бюджетного научного учреждения «Дальневосточный научный центр физиологии и патологии дыхания»-Научно-исследовательский институт медицинской климатологии и восстановительного лечения, 690105, Россия, г. Владивосток, ул. Русская, 73г.
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