Abstract:
:(1) Increased oxidative stress plays a significant role in the etiology of cardiovascular disease. Lipid peroxidation, initiated in the presence of hydroxy radicals resulting in the production of malondialdehyde, directly produces oxidative stress. This study was designed to examine the direct impact of malondialdehyde on ventricular contractile function at the single cardiac myocyte level. Ventricular myocytes from adult rat hearts were stimulated to contract at 0.5 Hz, and mechanical and intracellular Ca(2+) properties were evaluated using an IonOptix Myocam system. Contractile properties analyzed included peak shortening amplitude (PS), time-to-PS (TPS), time-to-90% relengthening (TR(90)), maximal velocity of shortening/relengthening (+/-dLdt), and Ca(2+)-induced intracellular Ca(2+) fluorescence release (CICR) and intracellular Ca(2+) decay (tau). p38 mitogen-activated protein (MAP) kinase phosphorylation was assessed with Western blot. (2) Our results indicated that malondialdehyde directly depressed PS, +/-dLdt and CICR in a concentration-dependent manner and shortened TPS without affecting TR(90) and tau. Interestingly, the malondialdehyde-induced cardiac mechanical effect was abolished by both the p38 MAP kinase inhibitor SB203580 (1 and 10 micro M) and the antioxidant vitamin C (100 micro M). Western blot analysis confirmed direct phosphorylation of p38 MAP kinase by malondialdehyde. (3) These findings revealed a novel role of malondialdehyde and p38 MAP kinase in lipid peroxidation and oxidative stress-associated cardiac dysfunction.
journal_name
Br J Pharmacoljournal_title
British journal of pharmacologyauthors
Folden DV,Gupta A,Sharma AC,Li SY,Saari JT,Ren Jdoi
10.1038/sj.bjp.0705384subject
Has Abstractpub_date
2003-08-01 00:00:00pages
1310-6issue
7eissn
0007-1188issn
1476-5381journal_volume
139pub_type
杂志文章abstract::In CHO cells transfected with the rat dopamine D2 receptor (long isoform), administration of dopamine per se elicited a concentration-dependent increase in arachidonic acid (AA) release. The maximal effect was 197% of controls (EC50=25 nM). The partial D2 receptor agonist, (-)-(3-hydroxyphenyl)-N-n-propylpiperidine [(...
journal_title:British journal of pharmacology
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journal_title:British journal of pharmacology
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journal_title:British journal of pharmacology
pub_type: 临床试验,杂志文章
doi:10.1111/j.1476-5381.1968.tb07956.x
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abstract::1. The anti-inflammatory effect of alpha-trinositol (D-myo-inositol-1,2,6-trisphosphate) on oedema formation, microvascular protein leakage and interstitial fluid pressure (Pif) in rat skin after frostbite injury, was investigated. Alpha-trinositol (40 mg kg body weight(-1)) was administered intravenously as a bolus b...
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doi:10.1111/j.1476-5381.1994.tb17048.x
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