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Rescue of loss‐of‐function long QT syndrome‐associated mutations in K V 7.1/KCNE1 by the endocannabinoid N‐arachidonoyl‐L‐serine (ARA‐S)
Author(s) -
HiniestoIñigo Irene,
Sridhar Akshay,
Louradour Julien,
De la Cruz Alicia,
Lundholm Siri,
JauregiMiguel Amaia,
Giannetti Federica,
Sala Luca,
Odening Katja E.,
Larsson H. Peter,
Ottosson Nina E.,
Liin Sara I.
Publication year - 2025
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/bph.70008
Subject(s) - long qt syndrome , endocannabinoid system , qt interval , mutation , loss function , electrophysiology , xenopus , mutant , biology , ion channel , microbiology and biotechnology , medicine , chemistry , pharmacology , genetics , phenotype , gene , neuroscience , receptor
Abstract Background and Purpose Congenital long QT syndrome (LQTS) involves genetic mutations affecting ion channels, leading to a prolonged QT interval and increased risk of potentially lethal ventricular arrhythmias. Mutations in the genes encoding K V 7.1/KCNE1 are the most frequent, with channel loss‐of‐function contributing to LQTS. The endocannabinoid N‐arachidonoyl‐L‐serine (ARA‐S) has been shown to facilitate activation of wild type K V 7.1/KCNE1 channels and to counteract a prolonged QT interval in isolated guinea pig hearts. In this study, we examine the ability of ARA‐S to facilitate activation of LQTS‐associated mutations, in various regions of the channel, and hence to counteract loss‐of‐function. Experimental Approach The two‐electrode voltage clamp technique on Xenopus oocytes expressing human K V 7.1/KCNE1 channels was used to investigate the effects of ARA‐S in 20 LQTS type 1‐associated mutations distributed across the channel. Thereafter, different electrophysiology was used to assess ARA‐S effects in mammalian cells. Key Results ARA‐S enhanced the function of all mutated channels by shifting V 50 and increasing current amplitude. However, the magnitude of effect varied, related to whether mutations were in one of the two putative ARA‐S binding sites on the channel as suggested by molecular dynamics simulations. ARA‐S displayed translational potential by facilitating channel opening in mammalian cells and shortening the action potential duration in cardiomyocytes. Conclusions and Implications This study demonstrates the rescuing capability of ARA‐S on a diverse set of LQTS mutants. These insights may aid in developing drug compounds using ARA‐S sites and mechanisms and guide interpretation of which LQTS mutants respond well to such compounds.