Number of the records: 1
Transgenic rescue of defective Cd36 enhances myocardial adenylyl cyclase signaling in spontaneously hypertensive rats
- 1.
SYSNO ASEP 0398826 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Transgenic rescue of defective Cd36 enhances myocardial adenylyl cyclase signaling in spontaneously hypertensive rats Author(s) Klevstig, M. (CZ)
Manakov, D. (CZ)
Kašparová, D. (CZ)
Brabcová, I. (CZ)
Papoušek, František (FGU-C)
Žurmanová, J. (CZ)
Zídek, Václav (FGU-C) RID
Šilhavý, Jan (FGU-C) RID, ORCID
Neckář, Jan (FGU-C) RID, ORCID
Pravenec, Michal (FGU-C) RID, ORCID
Kolář, František (FGU-C) RID, ORCID, SAI
Nováková, O. (CZ)
Novotný, J. (CZ)Source Title Pflugers Archiv - European Journal of Physiology - ISSN 0031-6768
Roč. 465, č. 10 (2013), s. 1477-1486Number of pages 10 s. Language eng - English Country US - United States Keywords SHR rats ; Cd36 ; heart ; beta-Adrenergic receptors ; Adenylyl cyclase ; Protein kinase A Subject RIV ED - Physiology R&D Projects LL1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) IAAX01110901 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GAP303/10/0505 GA ČR - Czech Science Foundation (CSF) Institutional support FGU-C - RVO:67985823 UT WOS 000324325500009 EID SCOPUS 84884908537 DOI 10.1007/s00424-013-1281-5 Annotation Dysfunction or abnormalities in the regulation of fatty acid translocase Cd36, a multifunctional membrane protein participating in uptake of long-chain fatty acids, has been linked to the development of heart diseases both in animals and humans. We have previously shown that the Cd36 transgenic spontaneously hypertensive rat (SHR-Cd36), with a wild type Cd36, has higher susceptibility to ischemic ventricular arrhythmias when compared to spontaneously hypertensive rat (SHR) carrying a mutant Cd36 gene, which may have been related to increased beta-adrenergic responsiveness of these animals (Neckar et al., 2012 Physiol. Genomics 44:173–182). The present study aimed to determine whether the insertion of the wild type Cd36 into SHR would affect the function of myocardial G protein-regulated adenylyl cyclase (AC) signaling. beta-Adrenergic receptors (beta-ARs) were characterized by radioligand-binding experiments and the expression of selected G protein subunits, AC, and protein kinase A (PKA) was determined by RT-PCR andWestern blot analyses. There was no significant difference in the amount of trimeric G proteins, but the number of beta-ARs was higher (by about 35 %) in myocardial preparations from SHR-Cd36 as compared to SHR. Besides that, transgenic rats expressed increased amount (by about 20 %) of the dominant myocardial isoforms AC5/6 and contained higher levels of both nonphosphorylated (by 11 %) and phosphorylated (by 45 %) PKA. Differently stimulated AC activity in SHRCd36 significantly exceeded (by about 18–30 %) the enzyme activity in SHR. Changes at themolecular level were reflected by higher contractile responses to stimulation by the adrenergic agonist dobutamine. In summary, it can be concluded that the increased susceptibility to ischemic arrhythmias of SHR-Cd36 is attributable to upregulation of some components of the beta-AR signaling pathway, which leads to enhanced sensitization of AC and increased cardiac adrenergic responsiveness Workplace Institute of Physiology Contact Lucie Trajhanová, lucie.trajhanova@fgu.cas.cz, Tel.: 241 062 400 Year of Publishing 2014
Number of the records: 1