{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T13:22:43Z","timestamp":1792156963429,"version":"4.4.0"},"reference-count":61,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T00:00:00Z","timestamp":1712534400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Slovak Research and Development Agency","award":["APVV-21-0095"],"award-info":[{"award-number":["APVV-21-0095"]}]},{"name":"Slovak Research and Development Agency","award":["1\/0067\/24"],"award-info":[{"award-number":["1\/0067\/24"]}]},{"name":"VEGA","award":["APVV-21-0095"],"award-info":[{"award-number":["APVV-21-0095"]}]},{"name":"VEGA","award":["1\/0067\/24"],"award-info":[{"award-number":["1\/0067\/24"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Kaempferol (KAE) is a natural flavonoid with powerful reactive oxygen species (ROS) scavenging properties and beneficial effects on ex vivo sperm functionality. In this paper, we studied the ability of KAE to prevent or ameliorate structural, functional or oxidative damage to frozen\u2013thawed bovine spermatozoa. The analysis focused on conventional sperm quality characteristics prior to or following thermoresistance tests, namely the oxidative profile of semen alongside sperm capacitation patterns, and the levels of key proteins involved in capacitation signaling. Semen samples obtained from 30 stud bulls were frozen in the presence of 12.5, 25 or 50 \u03bcM KAE and compared to native ejaculates (negative control\u2014CtrlN) as well as semen samples cryopreserved in the absence of KAE (positive control\u2014CtrlC). A significant post-thermoresistance test maintenance of the sperm motility (p &lt; 0.001), membrane (p &lt; 0.001) and acrosome integrity (p &lt; 0.001), mitochondrial activity (p &lt; 0.001) and DNA integrity (p &lt; 0.001) was observed following supplementation with all KAE doses in comparison to CtrlC. Experimental groups supplemented with all KAE doses presented a significantly lower proportion of prematurely capacitated spermatozoa (p &lt; 0.001) when compared with CtrlC. A significant decrease in the levels of the superoxide radical was recorded following administration of 12.5 (p &lt; 0.05) and 25 \u03bcM KAE (p &lt; 0.01). At the same time, supplementation with 25 \u03bcM KAE in the cryopreservation medium led to a significant stabilization of the activity of Mg2+-ATPase (p &lt; 0.05) and Na+\/K+-ATPase (p &lt; 0.0001) in comparison to CtrlC. Western blot analysis revealed that supplementation with 25 \u03bcM KAE in the cryopreservation medium prevented the loss of the protein kinase A (PKA) and protein kinase C (PKC), which are intricately involved in the process of sperm activation. In conclusion, we may speculate that KAE is particularly efficient in the protection of sperm metabolism during the cryopreservation process through its ability to promote energy synthesis while quenching excessive ROS and to protect enzymes involved in the process of sperm capacitation and hyperactivation. These properties may provide supplementary protection to spermatozoa undergoing the freeze\u2013thaw process.<\/jats:p>","DOI":"10.3390\/ijms25074129","type":"journal-article","created":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T12:01:22Z","timestamp":1712577682000},"page":"4129","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Kaempferol as an Alternative Cryosupplement for Bovine Spermatozoa: Cytoprotective and Membrane-Stabilizing Effects"],"prefix":"10.3390","volume":"25","author":[{"given":"\u0160tefan","family":"Ba\u0148as","sequence":"first","affiliation":[{"name":"Institute of Biotechnology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2895-1249","authenticated-orcid":false,"given":"Eva","family":"Tvrd\u00e1","sequence":"additional","affiliation":[{"name":"Institute of Biotechnology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Filip","family":"Benko","sequence":"additional","affiliation":[{"name":"Institute of Biotechnology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2907-5909","authenticated-orcid":false,"given":"Michal","family":"\u010eura\u010dka","sequence":"additional","affiliation":[{"name":"AgroBioTech Research Centre, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4419-0590","authenticated-orcid":false,"given":"Nat\u00e1lia","family":"\u010cmikov\u00e1","sequence":"additional","affiliation":[{"name":"Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4565-2083","authenticated-orcid":false,"given":"Norbert","family":"Luk\u00e1\u010d","sequence":"additional","affiliation":[{"name":"Institute of Applied Biology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4460-0222","authenticated-orcid":false,"given":"Miroslava","family":"Ka\u010d\u00e1niov\u00e1","sequence":"additional","affiliation":[{"name":"Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Tr. A. Hlinku 2, 94976 Nitra, Slovakia"},{"name":"School of Medical and Health Sciences, University of Economics and Human Sciences in Warsaw, Okopowa 59, 010 43 Warsaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4716","DOI":"10.3390\/cimb45060300","article-title":"Sperm Cryopreservation Today: Approaches, Efficiency, and Pitfalls","volume":"45","author":"Ozimic","year":"2023","journal-title":"Curr. Issues Mol. Biol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"327","DOI":"10.1016\/j.rbmo.2018.05.012","article-title":"Sperm cryopreservation: A review on current molecular cryobiology and advanced approaches","volume":"37","author":"Hezavehei","year":"2018","journal-title":"Reprod. Biomed. 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