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(Hypertension. 2005;45:860.)
© 2005 American Heart Association, Inc.
Original Articles |
From the Department of Pharmacology (S.K., G-X.Z., A.N., T.S., L.Y., Y-Y.F., M.R., Y.A.) and the First Department of Surgery (T.S., H.M.), Kagawa University Medical School, Japan.
Correspondence to Shoji Kimura, MD, PhD, Department of Pharmacology, Kagawa University Medical School, 1750-1 Ikenobe, Miki, Kagawa 761-0793, Japan. E-mail kimura{at}kms.ac.jp
| Abstract |
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Key Words: angiotensin antioxidants free radicals heart
| Introduction |
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Angiotensin II (Ang II) is well known as a powerful inducer of oxidative stress to cardiovascular tissues, and the reactive oxygen species (ROS) generated participate in Ang IIinduced intracellular signaling pathways.10 We demonstrated that acutely administered Ang II stimulates redox-sensitive cardiac MAP kinase activation, which was eliminated by tempol, a superoxide dismutase mimetic, in vivo.11 To date, NAD(P)H oxidase has been considered a source of ROS corresponding to Ang II effects in cardiovascular tissues.1214 In fact, NAD(P)H oxidase may play an important role in cardiac hypertrophy and tissue remodeling through chronic Ang II effects; for example, cardiac hypertrophy induced by a chronic subpressor dose of Ang II infusion was suppressed in mice genetically deficient in gp91phox, a component of NAD(P)H oxidase.15 On the other hand, as the acute effects of Ang II, Liu et al demonstrated that pretreatment with Ang II exhibited preconditioning effects for cardioprotection against I/R injury in rabbits,16 which may lead to the opening of mitoKATP channels, as seen in common ligand-mediated preconditioning. However, it is not known whether ROS corresponding to the cardiac preconditioning effects of Ang II are derived predominantly from NAD(P)H oxidase or mitochondria, although Liu et al did not examine the involvement of mitoKATP channels or its redox sensitivity.16
These observations led us to evaluate the possible implications and interactions of NAD(P)H oxidasederived and mitochondria-derived ROS in cardioprotection against I/R injury by Ang II. In this study, we compared the effects of 5-HD, apocynin, an NAD(P)H oxidase inhibitor, and tempol on Ang IImediated preconditioning effects. Further, we examined the antioxidant properties and the site of action of 5-HD.
| Methods |
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Animal Preparation for Evaluations of 5-HD and Apocynin
To evaluate the site of action of 5-HD, we compared the effects of 5-HD and apocynin on cardiac MAP kinase, NAD(P)H oxidase, and cardiac thiobarbital reactive substances (TBARS) of Ang IIinfused rats. Ang II, at a rate of 200 ng · kg1 per minute, was given intravenously for 30 minutes on conscious rats as described previously.11 Before the start of Ang II or saline infusion, 5-HD was given at a dose of 10 mg · kg1 bolus, and apocynin at 10 mg · kg1 over a period of 2 hours. Arterial blood pressure was monitored continuously, and after 30 minutes of infusion, the heart was removed, quickly frozen in liquid nitrogen, and then stored at 80°C. All surgical and experimental procedures were performed according to the guidelines for the care and use of animals established by Kagawa University.
MAP Kinase Cascades
Measurements of the phosphorylated levels of MAP kinase elements (phosphoextracellular signal-regulated kinase [ERK]1/2, -MEK1/2, -Raf-1, -apoptosis signal-regulating kinase [ASK]-1, c-Jun NH2-terminal kinases [JNK], and -p38) in the cardiac left ventricle were conducted as described previously.11 The antibodies used in this experiment were purchased from Cell Signaling.
Tissue Lipid Peroxidation
Lipid peroxidation levels in cardiac tissue were determined by measurements of tissue TBARS11 and 8-iso-prostaglandin F2
(8-iso-PGF2
).18 For details of the method of extraction of 8-iso-PGF2
, see the online data supplement.
Radical Scavenging Activity of 5-HD
Evaluations of the scavenging activities of 5-HD for superoxide and hydroxyl radicals were conducted according to the methods described by Wada et al.19 See the online data supplement for details.
Cardiac NAD(P)H Oxidase
The complex formation and activity of cardiac NAD(P)H oxidase were measured according to the methods described in the online data supplement.
Rat Polymorphonuclear Leukocytes
Superoxide production and oxygen consumption of isolated rat polymorphonuclear leukocytes (RPNLs) were measured according to the method described in the online data supplement.
Mitochondrial Respiration and Superoxide Production
Mitochondrial oxygen consumption was measured using Clark-type electrodes (Hansatech). Superoxide production by cardiac mitochondria was measured by the lucigenin-chemiluminescence (LC) method, as reported by Li et al20 (see the online data supplement).
Statistical Analysis
Results are presented as means±SEM. Data were evaluated by ANOVA, and Duncans multiple-range test was used to locate differences between the experimental groups using SAS 6.02 software. A value of P<0.05 was chosen as the indicating statistical significance.
| Results |
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Effects of 5-HD and Apocynin on Activated Cardiac MAP Kinase Cascade by Ang II
As shown in Figure 2, augmentations of phosphorylated p38 and JNK MAP kinases by a 30-minute infusion of Ang II in the left ventricle were significantly suppressed by pretreatment with 5-HD or apocynin, whereas those of ERK1/2 were not affected. Ang IIinduced augmentation of phosphorylated ASK-1, an upstream regulator of p38 and JNK, was also suppressed by 5-HD, whereas phosphorylations of Raf-1 and MEK1/2, key upstream regulators of ERK1/2, were not affected. 5-HD or apocynin alone had no effects on any basal cardiac MAP kinase activities.
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Effects of 5-HD and Apocynin on Cardiac Lipid Peroxidation in Ang IIInfused Rats
We demonstrated previously that tempol eliminated the increase of cardiac TBARS, a maker of lipid peroxidation, induced in acutely Ang IIinfused rats.11 In this study, we compared the effects of pretreatment with 5-HD and apocynin on Ang IIinduced increases of TBARS (Figure 3) as well as 8-iso-PGF2
(supplemental Figure I, available online at http://www.hypertensionaha.org) contents in cardiac left ventricular tissue, resulting in significant suppression of the increases of these lipid peroxidation makers elicited by Ang II. 5-HD or apocynin alone had no effects on basal cardiac TBARS and 8-iso-PGF2
levels.
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5-HD Is Not a Radical Scavenger
As shown in Figure 4, tempol strongly scavenged superoxide radicals generated by xanthine/xanthine oxidase reaction and also suppressed hydroxyl radicals formed by the deoxyribose method in a concentration-dependent manner, whereas 5-DH had no effects on these ROS parameters at concentrations up to 10 mmol/L, indicating that 5-HD might not reduce ROS levels through scavenging activity similar to that of tempol.
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Effects of 5-HD and Apocynin on Cardiac NAD(P)H Oxidase Activity and Complex Formation Stimulated by Ang II
Complex formation of p47phox, p22phox, and Rac-1 of NAD(P)H oxidase in the cardiac left ventricle was determined by coimmunoprecipitation assays (Figure 5A; supplemental Figure II). The complex formation of these 3 components was promoted by a 30-minute infusion of Ang II. 5-HD or apocynin alone and pretreatment with 5-HD before Ang II infusion had no effects on basal or Ang IIinduced increases in complex formation. However, pretreatment with apocynin before Ang II infusion completely suppressed any Ang IIinduced increase in complex formation. As a control for the immunoprecipitations, the amounts of p47phox, p22phox, and Rac-1 immunoprecipitated in all the groups were essentially constant, as determined by direct immunoblotting (data not shown).
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NAD(P)H oxidase activity was analyzed in the membrane fraction obtained from Ang IIinfused rat cardiac left ventricle. Reflecting the NAD(P)H oxidase complex formation, the activity was augmented by Ang II infusion, which was completely blocked by pretreatment with apocynin but not by 5-HD (Figure 5B).
Ang II Does Not Stimulate Phagocyte NAD(P)H Oxidase
As shown in Figure 6A, phorbol 12-myristate 13-acetate (PMA), a powerful activator of phagocyte NAD(P)H oxidase, stimulated the superoxide production of the RPNL suspension, whereas 1 µmol/L Ang II had no effect on the superoxide production from RPNLs. PMA-stimulated phagocyte NAD(P)H oxidase was significantly suppressed by pretreatment with diphenyleneiodonium but not by 5-HD. In addition, PMA caused a dramatic increase in the oxygen consumption of RPNLs, namely a respiratory burst (2.23±0.15 nmol/L O2 · 106 cells1 per 5 minutes),21 whereas Ang II did not affect the basal respiration of RPNLs (Figure 6B).
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5-HD Suppresses Mitochondrial Superoxide Production
As shown in Figure 7A, superoxide production from isolated cardiac mitochondria gradually increased over 30 minutes, as also demonstrated by Li et al,20 whereas 5-HD at a dose of 100 µmol/L completely abolished the increase in mitochondrial superoxide production. With respect to mitochondrial respiration, the same dose of 5-HD had no significant effect on state 3 respiration (control 362±32 nmol/L; 5-HD 355±28 nmol/L; O2 · mg1 per minute for 5 separate experiments), respiratory control index (control 3.6±0.4; 5-HD 3.8±0.6), or ADP/O ratio (control 1.45±0.1; 5-HD 1.32±0.1) of isolated cardiac mitochondria (Figure 7B).
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| Discussion |
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Although the contribution of mitoKATP channels to ischemic preconditioning is controversial,22 many chemical and biological compounds exhibit pharmacological preconditioning through the opening of mitoKATP channels,3,2325 and in fact, pretreatment with mitoKATP channel openers have been shown to exhibit cardioprotective effects against subsequent I/R injury.2,4,5 In this study, we demonstrated that 5-HD effectively reduced the Ang IIinduced enhancement of cardiac lipid peroxidation levels by means other than that of radical scavenging activity, a phenomenon that may well be reflected in the result that 5-HD suppressed superoxide production from isolated cardiac mitochondria without any effects on the respiratory parameters. We also examined the effect of Ang II on RPNLs, which could be considered a probable candidate as a source of ROS in the preconditioning effect.26 The results clearly indicated that RPNLs are not involved in the Ang IImediating pharmacological preconditioning effects and that the inhibitory action by 5-HD does not depend on suppression of RPNL activity, if any. Therefore, ROS in heart tissue generated from mitochondria through the opening of the mitoKATP channel might be key mediators for Ang IIinduced pharmacological preconditioning, similar to other receptor-activating ligands.
However, a rather important question has been raised regarding the ROS source corresponding to Ang II stimulation in heart tissue because numerous independent lines of evidence have supported and proven the critical role of NAD(P)H oxidase in the actions of Ang II.27 Accordingly, we demonstrated in this study that pretreatment with apocynin suppressed augmentation of cardiac lipid peroxidation and the preconditioning effects of Ang II, pointing to the crucial role of NAD(P)H oxidase in cardiac Ang II signaling. However, activation of NAD(P)H oxidase does not directly link to the preconditioning effects because 5-HD reversed the Ang IIinduced preconditioning effects similarly to apocynin without affecting NAD(P)H oxidase complex formation and its activity. Thus, it would be reasonable to assume that activation of NAD(P)H oxidase is required for the actions of Ang II, but the direct contribution of ROS derived from NAD(P)H oxidase for the preconditioning effects in response to acute Ang II stimuli is limited, and NAD(P)H oxidase activation is upstream of mitochondria in Ang IIinduced ROS signaling.
There is no direct evidence available to show how ROS derived from membrane NAD(P)H oxidase interact with mitochondria. Interestingly, Zhang et al reconstituted mitoKATP channels of bovine heart using planar lipid bilayers and clearly demonstrated that superoxide stimulates the opening of reconstituted mitoKATP channels via a direct action on the sulfhydryl groups of this channel.28 Therefore, it could be speculated that Ang II first stimulates NAD(P)H oxidase in the heart via protein kinase Cmediated mechanism,16 but the ROS generated in this step are insufficient to exhibit preconditioning effects. However, it could serve as a trigger to a subsequent activation of mitoKATP channels on the mitochondrial inner membrane, enhancing ROS production to increase tissue lipid peroxidation and contribute to Ang IImediated preconditioning effects. Zorov et al further demonstrated ROS-induced ROS release, the mechanisms of which are primarily based on the mitochondrial permeability transition in cardiomyocytes.29 Collectively, the results of this study could be explained by intracellular ROS accelerating mechanisms from NAD(P)H oxidase to mitochondria.
Ang II signaling via Ang II type-1 receptors proceeds to activate stress-activated MAP kinase (ie, JNK and p38) as well as ERK1/2, and the signaling has also been implicated in cardiac hypertrophy3032 and heart failure.33 We demonstrated previously that Ang IIinduced activation of these MAP kinases in the heart was tempol quenchable.11 Interestingly, the Ang IIinduced activation of stress-inducible MAP kinases was eliminated by 5-HD as well as apocynin, whereas those of the Raf/MEK/ERK pathway were not affected by 5-HD or apocynin. Among the MAP kinase family, p38 MAP kinase is thought to be responsible for ischemic preconditioning in isolated heart5,6 and cultured cardiac cells.7,8 Although NO-mediated cardioprotection for I/R injury via ERK activation through mitochondrial ROS has also been proposed,34 the results of the present study support that stress-activated ASK pathway activation rather than that of the Raf/MEK/ERK pathway may play an important role in Ang IIinduced cardioprotection against I/R injury.
Perspective
We demonstrated that acutely administered Ang II promotes cardiac lipid peroxidation and that this effect is eliminated by pretreatment with 5-HD and apocynin. We also found that among the cardiac MAP kinase cascades activated by Ang II, the ASK-1/p38, JNK pathways are suppressed by 5-HD and apocynin. Considering the different sites of action of each compound, we conclude that cardiac mitochondria are responsible for the ROS that contribute to the activation of redox-sensitive MAP kinase cascades and the preconditioning effects in response to acute Ang II treatment and that activation of NAD(P)H oxidase is also essential because it leads to mitochondrial ROS production by Ang II stimulation. Further studies regarding the relationship between NAD(P)H oxidase and mitochondria will be needed to clarify the physiological and pathophysiological roles of intracellular ROS signaling.
| Acknowledgments |
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Received October 8, 2004; first decision October 31, 2004; accepted February 22, 2005.
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