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Kambayashi Y, Takekoshi S, Tanino Y, Watanabe K, Nakano M, Hitomi Y, Takigawa T, Ogino K, Yamamoto Y. Various Molecular Species of Diacylglycerol Hydroperoxide Activate Human Neutrophils via PKC Activation. J Clin Biochem Nutr 2007; 41:68-75. [PMID: 18392102 PMCID: PMC2274990 DOI: 10.3164/jcbn.2007009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2006] [Accepted: 12/22/2006] [Indexed: 11/22/2022] Open
Abstract
We have proposed that diacylglycerol hydroperoxide-induced unregulated signal transduction causes oxidative stress-related diseases. In this study, we investigated which molecular species of diacylglycerol hydroperoxide activated human peripheral neutrophils. All diacylglycerol hydroperoxides, diacylglycerol hydroxides, and diacyglycerols tested in the present study induced superoxide production by neutrophils. The ability to activate neutrophils among molecular species containing the same fatty acid composition was as follows; diacylglycerol hydroperoxide>diacylglycerol hydroxide>/=diacylglycerol. The diacylglycerol hydroperoxide composed of linoleate was a stronger activator for neutrophils than that composed of arachidonate. 1-Palmitoyl-2-linoleoylglycerol hydroperoxide (PLG-OOH) was the strongest stimulator for neutrophils. We reconfirmed that PLG-OOH activated protein kinase C (PKC) in neutrophils. PLG-OOH induced the phosphorylation of p47(phox), a substrate of PKC and a cytosolic component of NADPH oxidase, in neutrophils, as did N-formyl-methionyl-leucyl-phenylalanine or 4beta-phorbol-12beta-myristate-13alpha-acetate. Moreover, the time course of p47(phox) phosphorylation was comparable to that of superoxide production. These results suggest that PLG-OOH activated intracellular protein kinase C. PLG-OOH, produced via an uncontrolled process, can act as a biological second messenger to cause inflammatory disease from oxidative stress.
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Affiliation(s)
- Yasuhiro Kambayashi
- Department of Environmental and Preventive Medicine, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan
- Department of Photon and Free Radical Research¶, Japan Immunoresearch Laboratories, 351-1 Nishiyokote-cho, Takasaki 370-0021, Japan
| | - Susumu Takekoshi
- Department of Pathology, Tokai University School of Medicine, Bosedai, Isehara, Kanagawa 259-1193, Japan
| | - Yutaka Tanino
- School of Bionics, Tokyo University of Technology, 1404-1 Katakura, Hachioji 192-0982, Japan
| | - Keiichi Watanabe
- Department of Pathology, Tokai University School of Medicine, Bosedai, Isehara, Kanagawa 259-1193, Japan
| | - Minoru Nakano
- Department of Photon and Free Radical Research¶, Japan Immunoresearch Laboratories, 351-1 Nishiyokote-cho, Takasaki 370-0021, Japan
| | - Yoshiaki Hitomi
- Department of Environmental and Preventive Medicine, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan
| | - Tomoko Takigawa
- Department of Public Health, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8558, Japan
| | - Keiki Ogino
- Department of Environmental and Preventive Medicine, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan
- Department of Public Health, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8558, Japan
| | - Yorihiro Yamamoto
- School of Bionics, Tokyo University of Technology, 1404-1 Katakura, Hachioji 192-0982, Japan
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Özsoy MB, Pabuçcuoğlu A. The effect of acetaminophen on oxidative modification of low-density lipoproteins in hypercholesterolemic rabbits. J Clin Biochem Nutr 2007; 41:27-31. [PMID: 18392104 PMCID: PMC2274992 DOI: 10.3164/jcbn.2007004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2006] [Accepted: 12/01/2006] [Indexed: 02/02/2023] Open
Abstract
Oxidative modification of low-density lipoproteins (LDL) contributes to the pathology of atherosclerosis. Antioxidants may protect LDL against oxidative modification. Acetaminophen, a widely used analgesic and antipyretic agent, has significant antioxidant properties. However, there is little evidence to suggest that acetaminophen acts as an antioxidant for LDL oxidation in vivo. In this study, we investigated the in vivo effect of acetaminophen on LDL oxidation in hypercholesterolemic rabbits. The oxidative modification of LDL was identified by conjugated dienes and thiobarbituric acid-reactive substances (TBARS). In the cholesterol group which rabbits were fed a diet contained 1% g cholesterol for 8 weeks, TBARS contents and conjugated diene levels in the plasma and isolated LDL samples significantly increased compared with the control rabbits (p<0.05). However, in the cholesterol + acetaminophen group, the TBARS contents and conjugated diene levels were significantly lower than that of the cholesterol group (p<0.05). The results from in vitro studies also demonstrated that the LDL isolated from serum was oxidized by Cu(++) ions and this oxidation reduced in the presence of acetaminophen. The reduced oxidative modification of LDL by acetaminophen may be of therapeutic value in preventing the development and progression of atherosclerosis.
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Affiliation(s)
| | - Aysun Pabuçcuoğlu
- Department of Biochemistry, Faculty of Pharmacy, Ege University, Bornova 35100, Izmir, Turkey
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