{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T02:35:33Z","timestamp":1772159733340,"version":"3.50.1"},"reference-count":53,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:00:00Z","timestamp":1765584000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012190","name":"Ministry of Science and Higher Education of the Russian Federation","doi-asserted-by":"crossref","award":["075-15-2022-1110"],"award-info":[{"award-number":["075-15-2022-1110"]}],"id":[{"id":"10.13039\/501100012190","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Diagnostics"],"abstract":"<jats:p>Introduction: The contribution of SARS-CoV-2 infection to the severity of placental alterations in preeclampsia remains unclear. This study aimed to evaluate the morphological changes in placentas of women who experienced COVID-19 during pregnancy, with a focus on the presence or absence of preeclampsia. Materials and Methods: The study included placentas from: (1) patients with both COVID-19 during pregnancy and preeclampsia (n = 20, 2022); (2) patients with COVID-19 during pregnancy without preeclampsia (n = 20, 2022); (3) patients with preeclampsia but without COVID-19 (n = 5, 2019); (4) patients with physiological pregnancies without COVID-19 or gestational complications (n = 5, 2019). Histological and immunohistochemical examinations of the placentas were performed using antibodies against the SARS-CoV-2 spike protein, DPP4 (CD26), and VEGF. Results: Placentas from patients with both COVID-19 and preeclampsia demonstrated the most pronounced stromal and vascular alterations, including pseudo-infarctions and villous fibrosis. Chorangiosis, excessive fibrinoid deposition in the intervillous space, and accelerated villous maturation with an increased number of syncytial knots were more common in the preeclampsia groups, regardless of prior COVID-19 infection. Symptomatic forms of coronavirus infection were associated with more severe manifestations of malperfusion. Expression of the SARS-CoV-2 spike protein was detected in 78% of syncytiotrophoblast cells and 37% of decidual cells in 28 of 40 placentas from women with previous COVID-19, while its presence in the vascular endothelium, macrophages, and villous fibroblasts was focal, as was CD26 expression. VEGF expression did not differ significantly between patients with and without COVID-19. Conclusions: COVID-19 is associated with more pronounced stromal\u2013vascular alterations in the placenta; however, not all of these changes are directly caused by the virus itself but rather reflect the severe course of preeclampsia. Inflammatory alterations are nonspecific for COVID-19, even though CD26 and the SARS-CoV-2 spike protein are detectable in nearly all placental structures, whereas VEGF levels remain comparable to those observed in placentas prior to the coronavirus pandemic.<\/jats:p>","DOI":"10.3390\/diagnostics15243188","type":"journal-article","created":{"date-parts":[[2025,12,15]],"date-time":"2025-12-15T10:11:23Z","timestamp":1765793483000},"page":"3188","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Morphological Changes in the Placenta of Patients with COVID-19 During Pregnancy"],"prefix":"10.3390","volume":"15","author":[{"given":"Kseniia","family":"Rudenko","sequence":"first","affiliation":[{"name":"Almazov National Medical Research Centre, St. Petersburg 197341, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tatiana","family":"Roshchina","sequence":"additional","affiliation":[{"name":"Almazov National Medical Research Centre, St. Petersburg 197341, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irina","family":"Zazerskaya","sequence":"additional","affiliation":[{"name":"Almazov National Medical Research Centre, St. Petersburg 197341, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1878-4467","authenticated-orcid":false,"given":"Dmitry","family":"Kudlay","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Institute of Pharmacy, I.M. Sechenov First Moscow State Medical University, Moscow 119991, Russia"},{"name":"Department of Pharmacognosy and Industrial Pharmacy, Faculty of Fundamental Medicine, Lomonosov Moscow State University, Moscow 119991, Russia"},{"name":"Institute of Immunology FMBA of Russia, Moscow 115522, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9023-6986","authenticated-orcid":false,"given":"Anna","family":"Starshinova","sequence":"additional","affiliation":[{"name":"Almazov National Medical Research Centre, St. Petersburg 197341, Russia"},{"name":"Department of Mathematics and Computer Science, St-Petersburg State University, St. Petersburg 199034, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lubov","family":"Mitrofanova","sequence":"additional","affiliation":[{"name":"Almazov National Medical Research Centre, St. Petersburg 197341, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"8870129","DOI":"10.1155\/2021\/8870129","article-title":"Effect of COVID-19 on Mortality of Pregnant and Postpartum Women: A Systematic Review and Meta-Analysis","volume":"2021","author":"Karimi","year":"2021","journal-title":"J. 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