{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T04:03:41Z","timestamp":1782101021219,"version":"3.54.5"},"reference-count":60,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,4,29]],"date-time":"2024-04-29T00:00:00Z","timestamp":1714348800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010438","name":"Poznan University of Medical Sciences","doi-asserted-by":"publisher","award":["JAK0000079"],"award-info":[{"award-number":["JAK0000079"]}],"id":[{"id":"10.13039\/501100010438","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>The available evidence on vitamin K status in cystic fibrosis (CF) is scarce, lacking data on vitamin K2 (menaquinones\u2014MK). Therefore, we assessed vitamin K1, MK-4 and MK-7 concentrations (LC-MS\/MS) in 63 pancreatic insufficient and modulator na\u00efve CF patients, and compared to 61 healthy subjects (HS). Vitamin K1 levels did not differ between studied groups. MK-4 concentrations were higher (median &lt;1st\u20133rd quartile&gt;: 0.778 &lt;0.589\u20131.086&gt; vs. 0.349 &lt;0.256\u20130.469&gt;, p &lt; 0.0001) and MK-7 levels lower (0.150 &lt;0.094\u20130.259&gt; vs. 0.231 &lt;0.191\u20130.315&gt;, p = 0.0007) in CF patients than in HS. MK-7 concentrations were higher in CF patients receiving K1 and MK-7 supplementation than in those receiving vitamin K1 alone or no supplementation. Moreover, vitamin K1 concentrations depended on the supplementation regime. Based on multivariate logistic regression analysis, we have found that MK-7 supplementation dose has been the only predictive factor for MK-7 levels. In conclusion, vitamin K1 levels in CF are low if not currently supplemented. MK-4 concentrations in CF patients supplemented with large doses of vitamin K1 are higher than in HS. MK-7 levels in CF subjects not receiving MK-7 supplementation, with no regard to vitamin K1 supplementation, are low. There do not seem to be any good clinical predictive factors for vitamin K status.<\/jats:p>","DOI":"10.3390\/nu16091337","type":"journal-article","created":{"date-parts":[[2024,4,29]],"date-time":"2024-04-29T06:13:22Z","timestamp":1714371202000},"page":"1337","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Vitamin K Status Based on K1, MK-4, MK-7, and Undercarboxylated Prothrombin Levels in Adolescent and Adult Patients with Cystic Fibrosis: A Cross-Sectional Study"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8676-9803","authenticated-orcid":false,"given":"Patrycja","family":"Krzy\u017canowska-Jankowska","sequence":"first","affiliation":[{"name":"Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0953-2188","authenticated-orcid":false,"given":"Jan","family":"Nowak","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4091-7035","authenticated-orcid":false,"given":"Marta","family":"Kara\u017aniewicz-\u0141ada","sequence":"additional","affiliation":[{"name":"Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, Rokietnicka Street 3, 60-806 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0257-6180","authenticated-orcid":false,"given":"Ma\u0142gorzata","family":"Jamka","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva","family":"Klapkova","sequence":"additional","affiliation":[{"name":"Department of Medical Chemistry and Clinical Biochemistry, 2nd Faculty of Medicine, Charles University, V \u00davalu 84, 150 06 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szymon","family":"Kurek","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8291-5439","authenticated-orcid":false,"given":"S\u0142awomira","family":"Drzyma\u0142a-Czy\u017c","sequence":"additional","affiliation":[{"name":"Department of Bromatology, Poznan University of Medical Sciences, Rokietnicka Street 3, 60-806 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandra","family":"Lisowska","sequence":"additional","affiliation":[{"name":"Department of Pediatric Diabetes, Auxology and Obesity, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6724-1499","authenticated-orcid":false,"given":"Irena","family":"Wojsyk-Banaszak","sequence":"additional","affiliation":[{"name":"Department of Pneumonology, Allergology and Clinical Immunology, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wojciech","family":"Skorupa","sequence":"additional","affiliation":[{"name":"Department of Lung Diseases, Institute for Tuberculosis and Lung Diseases, Plocka Street 26, 01-138 Warsaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaros\u0142aw","family":"Szyd\u0142owski","sequence":"additional","affiliation":[{"name":"Department of Pediatric Otolaryngology, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard","family":"Prusa","sequence":"additional","affiliation":[{"name":"Department of Medical Chemistry and Clinical Biochemistry, 2nd Faculty of Medicine, Charles University, V \u00davalu 84, 150 06 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5813-5707","authenticated-orcid":false,"given":"Jaros\u0142aw","family":"Walkowiak","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna Street 27\/33, 60-572 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"182","DOI":"10.3945\/an.111.001800","article-title":"Vitamin K nutrition, metabolism, and requirements: Current concepts and future research","volume":"3","author":"Shearer","year":"2012","journal-title":"Adv. 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