{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T20:54:10Z","timestamp":1769115250861,"version":"3.49.0"},"reference-count":110,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2022,10,17]],"date-time":"2022-10-17T00:00:00Z","timestamp":1665964800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001691","name":"the Japan Society for Promotion of Science","doi-asserted-by":"publisher","award":["08102003"],"award-info":[{"award-number":["08102003"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"the Japan Society for Promotion of Science","doi-asserted-by":"publisher","award":["15K19425"],"award-info":[{"award-number":["15K19425"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"the Japan Society for Promotion of Science","doi-asserted-by":"publisher","award":["21K16344"],"award-info":[{"award-number":["21K16344"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"the Japan Society for Promotion of Science","doi-asserted-by":"publisher","award":["21K15375"],"award-info":[{"award-number":["21K15375"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Sleep apnea syndrome (SAS) is characterized by recurrent episodes of oxygen desaturation and reoxygenation (intermittent hypoxia [IH]), and is a risk factor for cardiovascular disease (CVD) and insulin resistance\/Type 2 diabetes. However, the mechanisms linking IH stress and CVD remain elusive. We exposed rat H9c2 and mouse P19.CL6 cardiomyocytes to experimental IH or normoxia for 24 h to analyze the mRNA expression of several cardiomyokines. We found that the mRNA levels of regenerating gene IV (Reg IV) and hepatocyte growth factor (Hgf) in H9c2 and P19.CL6 cardiomyocytes were significantly increased by IH, whereas the promoter activities of the genes were not increased. A target mRNA search of microRNA (miR)s revealed that rat and mouse mRNAs have a potential target sequence for miR-499. The miR-499 level of IH-treated cells was significantly decreased compared to normoxia-treated cells. MiR-499 mimic and non-specific control RNA (miR-499 mimic NC) were introduced into P19.CL6 cells, and the IH-induced upregulation of the genes was abolished by introduction of the miR-499 mimic, but not by the miR-499 mimic NC. These results indicate that IH stress downregulates the miR-499 in cardiomyocytes, resulting in increased levels of Reg IV and Hgf mRNAs, leading to the protection of cardiomyocytes in SAS patients.<\/jats:p>","DOI":"10.3390\/ijms232012414","type":"journal-article","created":{"date-parts":[[2022,10,17]],"date-time":"2022-10-17T21:11:51Z","timestamp":1666041111000},"page":"12414","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Upregulation of Reg IV and Hgf mRNAs by Intermittent Hypoxia via Downregulation of microRNA-499 in Cardiomyocytes"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4066-0199","authenticated-orcid":false,"given":"Shin","family":"Takasawa","sequence":"first","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Asako","family":"Itaya-Hironaka","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mai","family":"Makino","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9417-4738","authenticated-orcid":false,"given":"Akiyo","family":"Yamauchi","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sumiyo","family":"Sakuramoto-Tsuchida","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomoko","family":"Uchiyama","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"},{"name":"Department of Diagnostic Pathology, Nara Medical University, 840 Shijo-cho, Kashihara 634-8522, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4165-1200","authenticated-orcid":false,"given":"Ryogo","family":"Shobatake","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7738-5576","authenticated-orcid":false,"given":"Yoshinori","family":"Takeda","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroyo","family":"Ota","sequence":"additional","affiliation":[{"name":"Department of Respiratory Medicine, Nara Medical University, 840 Shijo-cho, Kashihara 634-8522, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1152\/physrev.00043.2008","article-title":"Pathophysiology of sleep apnea","volume":"90","author":"Dempsey","year":"2010","journal-title":"Physiol. 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