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Both enalapril and losartan attenuate sarcolemmal Na+-K+-ATPase remodeling in failing rat heart due to myocardial infarction.
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- Author(s): Guo X;Guo X; Wang J; Elimban V; Dhalla NS
- Source:
Canadian journal of physiology and pharmacology [Can J Physiol Pharmacol] 2008 Apr; Vol. 86 (4), pp. 139-47.
- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't
- Language:
English
- Additional Information
- Source:
Publisher: Canadian Science Publishing Country of Publication: Canada NLM ID: 0372712 Publication Model: Print Cited Medium: Print ISSN: 0008-4212 (Print) Linking ISSN: 00084212 NLM ISO Abbreviation: Can J Physiol Pharmacol Subsets: MEDLINE
- Publication Information:
Publication: 2011- : Ottawa, ON : Canadian Science Publishing
Original Publication: Ottawa, National Research Council of Canada.
- Subject Terms:
- Abstract:
To investigate the mechanisms underlying the depressed sarcolemmal (SL) Na(+)-K(+)-ATPase activity in congestive heart failure (CHF), different isoforms and gene expression of Na(+)-K(+)-ATPase were examined in the failing left ventricle (LV) at 8 weeks after myocardial infarction (MI). In view of the increased activity of renin-angiotensin system (RAS) in CHF, these parameters were also studied after 5 weeks of treatment with enalapril (10 mg x kg-1 x day-1), an angiotensin-converting enzyme inhibitor, and losartan (20 mg.kg-1.day-1), an angiotensin II type 1 receptor antagonist, starting at 3 weeks after the coronary ligation in rats. The infarcted animals showed LV dysfunction and depressed SL Na(+)-K(+)-ATPase activity. Protein content and mRNA levels for Na(+)-K(+)-ATPase alpha2 isoform were decreased whereas those for Na(+)-K(+)-ATPase alpha3 isoform were increased in the failing LV. On the other hand, no significant changes were observed in protein content or mRNA levels for Na(+)-K(+)-ATPase alpha1 and beta1 isoforms. The treatment of infarcted animals with enalapril or losartan improved LV function and attenuated the depression in Na(+)-K(+)-ATPase alpha2 isoform as well as the increase in alpha3 isoform, at both the protein and mRNA levels; however, combination therapy with enalapril and losartan did not produce any additive effects. These results provide further evidence that CHF due to MI is associated with remodeling of SL membrane and suggest that the blockade of RAS plays an important role in preventing these alterations in the failing heart.
- Accession Number:
0 (Angiotensin II Type 1 Receptor Blockers)
0 (Angiotensin-Converting Enzyme Inhibitors)
0 (RNA, Messenger)
69PN84IO1A (Enalapril)
EC 3.6.1.- (Atp1a2 protein, rat)
EC 7.2.2.13 (Sodium-Potassium-Exchanging ATPase)
JMS50MPO89 (Losartan)
- Publication Date:
Date Created: 20080418 Date Completed: 20080702 Latest Revision: 20191210
- Publication Date:
20231215
- Accession Number:
10.1139/Y08-006
- Accession Number:
18418421
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