{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T13:16:29Z","timestamp":1787836589825,"version":"build-2784847793"},"reference-count":73,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2024,2,13]],"date-time":"2024-02-13T00:00:00Z","timestamp":1707782400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Since zinc is involved in many aspects of the hematopoietic process, zinc supplementation can reduce erythropoiesis-stimulating agents (ESAs) in patients undergoing hemodialysis. However, it remains unclear whether hypoxia-inducible factor\u2013prolyl hydroxylase inhibitors (HIF-PHIs) have similar reduction effects. HIF-PHI stabilizes HIF, which promotes hematopoiesis, although HIF-1\u03b1 levels are downregulated by zinc. This study aimed to investigate the effect of zinc supplementation on the hematopoietic effect of HIF-PHI in patients undergoing hemodialysis. Thirty patients undergoing maintenance hemodialysis who underwent periods of treatment with roxadustat or darbepoetin alfa during the past 3 years were retrospectively observed. Participants who underwent periods with and without zinc supplementation were selected, with nine treated with darbepoetin alfa and nine treated with roxadustat. Similarly to the ESA responsiveness index (ERI), the hematopoietic effect of zinc supplementation was determined by the HIF-PHI responsiveness index (HRI), which was calculated by dividing the HIF-PHI dose (mg\/week) by the patient\u2019s dry weight (kg) and hemoglobin level (g\/L). Zinc supplementation significantly increased ERI (p &lt; 0.05), but no significant change was observed (p = 0.931) in HRI. Although zinc supplementation did not significantly affect HRI, adequate zinc supplementation is required to alleviate concerns such as vascular calcification and increased serum copper during the use of HIF-PHI.<\/jats:p>","DOI":"10.3390\/nu16040520","type":"journal-article","created":{"date-parts":[[2024,2,14]],"date-time":"2024-02-14T04:18:22Z","timestamp":1707884302000},"page":"520","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Zinc Supplementation Enhances the Hematopoietic Activity of Erythropoiesis-Stimulating Agents but Not Hypoxia-Inducible Factor\u2013Prolyl Hydroxylase Inhibitors"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6392-8349","authenticated-orcid":false,"given":"Akira","family":"Takahashi","sequence":"first","affiliation":[{"name":"Dialysis Center, Tesseikai Neurosurgical Hospital, Shijonawate 575-8511, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3783","DOI":"10.3390\/nu7053783","article-title":"Oral zinc supplementation reduces the erythropoietin responsiveness index in patients on hemodialysis","volume":"15","author":"Kobayashi","year":"2015","journal-title":"Nutrients"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Sato, E., Sato, S., Degawa, M., Ono, T., Lu, H., Matsumura, D., Nomura, M., Moriyama, N., Amaha, M., and Nakamura, T. 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