{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T15:25:30Z","timestamp":1785597930998,"version":"3.56.0"},"reference-count":52,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2023,2,10]],"date-time":"2023-02-10T00:00:00Z","timestamp":1675987200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004006","name":"Bilimsel Ara\u015ftirma Projeleri Birimi, Istanbul \u00dcniversitesi","doi-asserted-by":"publisher","award":["TDK-2018-30939"],"award-info":[{"award-number":["TDK-2018-30939"]}],"id":[{"id":"10.13039\/501100004006","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Biol Rhythms"],"published-print":{"date-parts":[[2023,4]]},"abstract":"<jats:p>\n                    The circadian timing system controls absorption, distribution, metabolism, and elimination processes of drug pharmacokinetics over a 24-h period. Exposure of target tissues to the active form of the drug and cytotoxicity display variations depending on the chronopharmacokinetics. For anticancer drugs with narrow therapeutic ranges and dose-limiting side effects, it is particularly important to know the temporal changes in pharmacokinetics. A previous study indicated that pharmacokinetic profile of capecitabine was different depending on dosing time in rat. However, it is not known how such difference is attributed with respect to diurnal rhythm. Therefore, in this study, we evaluated capecitabine-metabolizing enzymes in a diurnal rhythm-dependent manner. To this end, C57BL\/6J male mice were orally treated with 500 mg\/kg capecitabine at ZT1, ZT7, ZT13, or ZT19. We then determined pharmacokinetics of capecitabine and its metabolites, 5\u2032-deoxy-5-fluorocytidine (5\u2032DFCR), 5\u2032-deoxy-5-fluorouridine (5\u2032DFUR), 5-fluorouracil (5-FU), in plasma and liver. Results revealed that plasma C\n                    <jats:sub>max<\/jats:sub>\n                    and AUC\n                    <jats:sub>0-6h<\/jats:sub>\n                    (area under the plasma concentration-time curve from 0 to 6 h) values of capecitabine, 5\u2032DFUR, and 5-FU were higher during the rest phase (ZT1 and ZT7) than the activity phase (ZT13 and ZT19) ( p &lt; 0.05). Similarly, C\n                    <jats:sub>max<\/jats:sub>\n                    and AUC\n                    <jats:sub>0-6h<\/jats:sub>\n                    values of 5\u2032DFUR and 5-FU in liver were higher during the rest phase than activity phase ( p &lt; 0.05), while there was no significant difference in liver concentrations of capecitabine and 5\u2032DFCR. We determined the level of the enzymes responsible for the conversion of capecitabine and its metabolites at each ZT. Results indicated the levels of carboxylesterase 1 and 2, cytidine deaminase, uridine phosphorylase 2, and dihydropyrimidine dehydrogenase ( p &lt; 0.05) are being rhythmically regulated and, in turn, attributed different pharmacokinetics profiles of capecitabine and its metabolism. This study highlights the importance of capecitabine administration time to increase the efficacy with minimum adverse effects.\n                  <\/jats:p>","DOI":"10.1177\/07487304221148779","type":"journal-article","created":{"date-parts":[[2023,2,10]],"date-time":"2023-02-10T05:30:14Z","timestamp":1676007014000},"page":"171-184","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Diurnal Changes in Capecitabine Clock-Controlled Metabolism Enzymes Are Responsible for Its Pharmacokinetics in Male Mice"],"prefix":"10.1177","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1734-8340","authenticated-orcid":false,"given":"Yasemin Kubra","family":"Akyel","sequence":"first","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey"},{"name":"Department of Medical Pharmacology, School of Medicine, Istanbul Medipol University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dilek","family":"Ozturk Civelek","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, Bezmialem Vakif University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Narin","family":"Ozturk Seyhan","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seref","family":"Gul","sequence":"additional","affiliation":[{"name":"Biotechnology Division, Department of Biology, Faculty of Science, Istanbul University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isil","family":"Gazioglu","sequence":"additional","affiliation":[{"name":"Department of Analytical Chemistry, Faculty of Pharmacy, Bezmialem Vakif University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zeliha","family":"Pala Kara","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francis","family":"L\u00e9vi","sequence":"additional","affiliation":[{"name":"UPR \u201cChronotherapy, Cancer and Transplantation,\u201d Medical School, Paris-Saclay University, Villejuif, France"},{"name":"Medical Oncology Department, Paul Brousse Hospital, Villejuif, France"},{"name":"Cancer Chronotherapy Team, Cancer Research Centre, Division of Biomedical Sciences, Warwick Medical School, Coventry, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6624-3505","authenticated-orcid":false,"given":"Ibrahim Halil","family":"Kavakli","sequence":"additional","affiliation":[{"name":"Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey"},{"name":"Department of Chemical and Biological Engineering, Koc University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9891-5588","authenticated-orcid":false,"given":"Alper","family":"Okyar","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, 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