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We hypothesized that myocardial alterations in HCN2 and HCN4 channels occur under hyperglycaemia.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Diabetes was induced in rats using a single injection of streptozotocin (STZ; 55\u00a0mg\/kg body weight, i.p.). Basal ECG was measured. Expression of mRNA for HCN channels, potassium channels and microRNA 1 and 133a were measured in ventricular tissues. Protein expression of HCN2 channel isoform was assessed in five different regions of the heart by western blotting. Differentiated H9c2 cell line was used to examine HCN channels expression under hyperglycaemia in vitro.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Six weeks after STZ administration, heart rate was reduced, QRS complex duration, QT interval and T-wave were prolonged in diabetic rats compared to controls. mRNA and protein expressions of HCN2 decreased exclusively in the ventricles of diabetic rats. HCN2 expression levels in atria of STZ rats and H9c2 cells treated with excess of glucose were not changed. MicroRNA levels were stable in STZ rat hearts. We found significantly decreased mRNA levels of several potassium channels participating in repolarization, namely Kcnd2 (<jats:italic>I<\/jats:italic><jats:sub>to1<\/jats:sub>), Kcnh2 (<jats:italic>I<\/jats:italic><jats:sub>Kr<\/jats:sub>), Kcnq1 (<jats:italic>I<\/jats:italic><jats:sub>Ks<\/jats:sub>) and Kcnj11 (<jats:italic>I<\/jats:italic><jats:sub>KATP<\/jats:sub>).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>This result together with downregulated HCN2 channels suggest that HCN channels might be an integral part of ventricular electric remodelling and might play a role in cardiac repolarization projected in altered arrhythmogenic profile of diabetic heart.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12872-021-01929-3","type":"journal-article","created":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T13:04:15Z","timestamp":1614690255000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Isolated downregulation of HCN2 in ventricles of rats with streptozotocin-induced diabetic cardiomyopathy"],"prefix":"10.1186","volume":"21","author":[{"given":"Katarina","family":"Hadova","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva","family":"Kralova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel","family":"Doka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lenka","family":"Bies Pivackova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zuzana","family":"Kmecova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Krenek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6845-2105","authenticated-orcid":false,"given":"Jan","family":"Klimas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,2]]},"reference":[{"key":"1929_CR1","doi-asserted-by":"publisher","first-page":"2142","DOI":"10.1093\/eurheartj\/ehi376","volume":"26","author":"X Jouven","year":"2005","unstructured":"Jouven X, Lema\u00eetre RN, Rea TD, Sotoodehnia N, Empana J-P, Siscovick DS. 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The investigation follows the Guide for the Care and Use of Laboratory Animals: Eighth Edition (2010) published by the US Committee for the Update of the Guide for the Care and Use of Laboratory Animals; National Research Council, the EU adopted Directive 2010\/63\/EU of the European Parliament and of the Council on the protection of animals used for experimental and other scientific purposes and the Slovak law regulating animal experiments. The study was carried out in compliance with the ARRIVE guidelines.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that there is no conflict of interest associated with this study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"118"}}