{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,11]],"date-time":"2026-10-11T19:40:25Z","timestamp":1791747625795,"version":"4.3.4"},"reference-count":62,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2023,1,4]],"date-time":"2023-01-04T00:00:00Z","timestamp":1672790400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000002","name":"NIH","doi-asserted-by":"publisher","award":["R15HL154073"],"award-info":[{"award-number":["R15HL154073"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>The brief opening mode of the mitochondrial permeability transition pore (mPTP) serves as a calcium (Ca2+) release valve to prevent mitochondrial Ca2+ (mCa2+) overload. Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a stress-induced arrhythmic syndrome due to mutations in the Ca2+ release channel complex of ryanodine receptor 2 (RyR2). We hypothesize that inhibiting the mPTP opening in CPVT exacerbates the disease phenotype. By crossbreeding a CPVT model of CASQ2 knockout (KO) with a mouse missing CypD, an activator of mPTP, a double KO model (DKO) was generated. Echocardiography, cardiac histology, and live-cell imaging were employed to assess the severity of cardiac pathology. Western blot and RNAseq were performed to evaluate the contribution of various signaling pathways. Although exacerbated arrhythmias were reported, the DKO model did not exhibit pathological remodeling. Myocyte Ca2+ handling was similar to that of the CASQ2 KO mouse at a low pacing frequency. However, increased ROS production, activation of the CaMKII pathway, and hyperphosphorylation of RyR2 were detected in DKO. Transcriptome analysis identified altered gene expression profiles associated with electrical instability in DKO. Our study provides evidence that genetic inhibition of mPTP exacerbates RyR2 dysfunction in CPVT by increasing activation of the CaMKII pathway and subsequent hyperphosphorylation of RyR2.<\/jats:p>","DOI":"10.3390\/cells12020204","type":"journal-article","created":{"date-parts":[[2023,1,4]],"date-time":"2023-01-04T02:15:42Z","timestamp":1672798542000},"page":"204","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Genetic Inhibition of Mitochondrial Permeability Transition Pore Exacerbates Ryanodine Receptor 2 Dysfunction in Arrhythmic Disease"],"prefix":"10.3390","volume":"12","author":[{"given":"Arpita","family":"Deb","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian D.","family":"Tow","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"You","family":"Qing","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory for Agricultural Application and New Technique, College of Plant Science and Technology, Bioinformatics Center, Beijing University of Agriculture, Beijing 102206, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Madelyn","family":"Walker","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emmanuel R.","family":"Hodges","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Division of BioMolecular Sciences, University of Mississippi, Oxford, MS 38677, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8920-8809","authenticated-orcid":false,"suffix":"Jr.","given":"James A.","family":"Stewart","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Division of BioMolecular Sciences, University of Mississippi, Oxford, MS 38677, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bj\u00f6rn C.","family":"Knollmann","sequence":"additional","affiliation":[{"name":"Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Zheng","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory for Agricultural Application and New Technique, College of Plant Science and Technology, Bioinformatics Center, Beijing University of Agriculture, Beijing 102206, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9659-977X","authenticated-orcid":false,"given":"Ying","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Mississippi State University, Starkville, MS 39762, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"240","DOI":"10.1093\/cvr\/cvt024","article-title":"\u2018Ryanopathy\u2019: Causes and manifestations of RyR2 dysfunction in heart failure","volume":"98","author":"Belevych","year":"2013","journal-title":"Cardiovasc. 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