{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T02:04:54Z","timestamp":1791165894174,"version":"4.1.0"},"reference-count":64,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2022,7,5]],"date-time":"2022-07-05T00:00:00Z","timestamp":1656979200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["21-75-30009"],"award-info":[{"award-number":["21-75-30009"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>It is known that selenium nanoparticles (SeNPs) obtained on their basis have a pleiotropic effect, inducing the process of apoptosis in tumor cells, on the one hand, and protecting healthy tissue cells from death under stress, on the other hand. It has been established that SeNPs protect brain cells from ischemia\/reoxygenation through activation of the Ca2+ signaling system of astrocytes and reactive astrogliosis. At the same time, for a number of particles, the limitations of their use, associated with their size, are shown. The use of nanoparticles with a diameter of less than 10 nm leads to their short life-time in the bloodstream and rapid removal by the liver. Nanoparticles larger than 200 nm activate the complement system and are also quickly removed from the blood. The effects of different-sized SeNPs on brain cells have hardly been studied. Using the laser ablation method, we obtained SeNPs of various diameters: 50 nm, 100 nm, and 400 nm. Using fluorescence microscopy, vitality tests, PCR analysis, and immunocytochemistry, it was shown that all three types of the different-sized SeNPs have a cytoprotective effect on brain cortex cells under conditions of oxygen-glucose deprivation (OGD) and reoxygenation (R), suppressing the processes of necrotic death and inhibiting different efficiency processes of apoptosis. All of the studied SeNPs activate the Ca2+ signaling system of astrocytes, while simultaneously inducing different types of Ca2+ signals. SeNPs sized at 50 nm- induce Ca2+ responses of astrocytes in the form of a gradual irreversible increase in the concentration of cytosolic Ca2+ ([Ca2+]i), 100 nm-sized SeNPs induce stable Ca2+ oscillations without increasing the base level of [Ca2+]i, and 400 nm-sized SeNPs cause mixed patterns of Ca2+ signals. Such differences in the level of astrocyte Ca2+ signaling can explain the different cytoprotective efficacy of SeNPs, which is expressed in the expression of protective proteins and the activation of reactive astrogliosis. In terms of the cytoprotective efficiency under OGD\/R conditions, different-sized SeNPs can be arranged in descending order: 100 nm-sized &gt; 400 nm-sized &gt; 50 nm-sized.<\/jats:p>","DOI":"10.3390\/ijms23137464","type":"journal-article","created":{"date-parts":[[2022,7,5]],"date-time":"2022-07-05T10:21:33Z","timestamp":1657016493000},"page":"7464","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["Size-Dependent Cytoprotective Effects of Selenium Nanoparticles during Oxygen-Glucose Deprivation in Brain Cortical Cells"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1158-5174","authenticated-orcid":false,"given":"Elena G.","family":"Varlamova","sequence":"first","affiliation":[{"name":"Institute of Cell Biophysics of the Russian Academy of Sciences, Federal Research Center \u201cPushchino Scientific Center for Biological Research of the Russian Academy of Sciences\u201d, 142290 Pushchino, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8814-6906","authenticated-orcid":false,"given":"Sergey V.","family":"Gudkov","sequence":"additional","affiliation":[{"name":"Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilove st., 119991 Moscow, Russia"},{"name":"Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, 603105 Nizhny Novgorod, Russia"},{"name":"All-Russia Research Institute of Phytopathology of the Russian Academy of Sciences, Big Vyazyomy, 143050 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2838-3704","authenticated-orcid":false,"given":"Egor Y.","family":"Plotnikov","sequence":"additional","affiliation":[{"name":"A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992 Moscow, Russia"},{"name":"V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology and Perinatology, 117997 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2528-8798","authenticated-orcid":false,"given":"Egor A.","family":"Turovsky","sequence":"additional","affiliation":[{"name":"Institute of Cell Biophysics of the Russian Academy of Sciences, Federal Research Center \u201cPushchino Scientific Center for Biological Research of the Russian Academy of Sciences\u201d, 142290 Pushchino, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1494","DOI":"10.3390\/nu7031494","article-title":"A Review of Dietary Selenium Intake and Selenium Status in Europe and the Middle East","volume":"7","author":"Stoffaneller","year":"2015","journal-title":"Nutrients"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Varlamova, E.G., Turovsky, E.A., and Blinova, E.V. 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