{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T17:28:19Z","timestamp":1791307699388,"version":"4.3.1"},"reference-count":59,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T00:00:00Z","timestamp":1776384000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100017638","name":"Ministry of Health of the Russian Federation","doi-asserted-by":"publisher","award":["056-03-2022-087"],"award-info":[{"award-number":["056-03-2022-087"]}],"id":[{"id":"10.13039\/501100017638","id-type":"DOI","asserted-by":"publisher"}]},{"award":["056-03-2022-087"],"award-info":[{"award-number":["056-03-2022-087"]}],"id":[{"id":"https:\/\/ror.org\/01p8ehb87","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>Aging is characterized by progressive degeneration of neuromuscular junctions (NMJs), which significantly contributes to muscle weakness and the development of sarcopenia. Photobiomodulation (PBM), a non-invasive therapeutic method based on the use of low-intensity light, has shown promising results in mitigating muscle degeneration in both experimental and clinical studies. The aim of this study was to evaluate the ultrastructural effects of photobiomodulation on neuromuscular junctions and skeletal muscle fibers in the m. vastus lateralis muscle of aged rats using light and transmission electron microscopy. Male Wistar rats (18 months old, body weight 650\u2013800 g, n = 10) were subjected to photobiomodulation of the right m. vastus lateralis muscle (650 nm, 6 J\/cm2, four consecutive daily sessions of 3 min each). The contralateral left limb served as an untreated control. Muscle samples were analyzed by light and transmission electron microscopy. Histological examination revealed typical age-related changes in control muscles, including variability in muscle fiber diameter, centrally located nuclei, and an increased volume of connective tissue. Ultrastructural analysis confirmed signs of skeletal muscle aging, such as myofibril fragmentation, sarcomere disorganization, lipofuscin accumulation, and tubular aggregate formation. Morphometric analysis of neuromuscular junctions after photobiomodulation showed an increase in the number of active zones on the presynaptic membrane, elongation of the postsynaptic membrane, and a reduction in the width of the synaptic cleft. In addition, mitochondrial hyperplasia was observed in presynaptic terminals, while the total number of synaptic vesicles decreased. These findings indicate a compensatory reorganization of neuromuscular junctions and suggest that photobiomodulation can enhance their functional activity in aged skeletal muscle.<\/jats:p>","DOI":"10.3390\/cells15080710","type":"journal-article","created":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T11:53:46Z","timestamp":1776426826000},"page":"710","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Ultrastructural Signs of High Functional Activity of Neuromuscular Synapses in Aging Rats After Photobiomodulation"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0012-3716","authenticated-orcid":false,"given":"Tatyana","family":"Vasyagina","sequence":"first","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4335-6109","authenticated-orcid":false,"given":"Daria","family":"Nefedova","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2602-6247","authenticated-orcid":false,"given":"Andrey","family":"Seliverstov","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6398-4746","authenticated-orcid":false,"given":"Natalya","family":"Shchelchkova","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"},{"name":"Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, 23 Gagarina Ave., 602022 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8294-4595","authenticated-orcid":false,"given":"Marina","family":"Bugrova","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Bavrina","sequence":"additional","affiliation":[{"name":"Federal State Budgetary Educational Institution of Higher Education Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, 603005 Nizhny Novgorod, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/j.mito.2023.07.003","article-title":"Mitochondrial dysfunction and skeletal muscle atrophy: Causes, mechanisms, and treatment strategies","volume":"72","author":"Kubat","year":"2023","journal-title":"Mitochondrion"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1007\/s00223-014-9915-y","article-title":"Skeletal muscle: A brief review of structure and function","volume":"96","author":"Frontera","year":"2015","journal-title":"Calcif. 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