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Kim H, Bae S, Kim Y, Cho CH, Kim SJ, Kim YJ, Lee SP, Kim HR, Hwang YI, Kang JS, Lee WJ. Vitamin C prevents stress-induced damage on the heart caused by the death of cardiomyocytes, through down-regulation of the excessive production of catecholamine, TNF-α, and ROS production in Gulo(-/-)Vit C-Insufficient mice. Free Radic Biol Med 2013; 65:573-583. [PMID: 23886864 DOI: 10.1016/j.freeradbiomed.2013.07.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 07/15/2013] [Accepted: 07/17/2013] [Indexed: 02/05/2023]
Abstract
It is thought that vitamin C has protective roles on stress-induced heart damage and the development of cardiovascular diseases, but its precise role and mechanisms are unclear. In the present study, we investigated the specific mechanisms by which vitamin C leads to protecting the heart from stress-induced damage in the Gulo(-/-) mice which cannot synthesize vitamin C like humans. By exposure to stress (1h/day), the heartbeat and cardiac output in vitamin C-insufficient Gulo(-/-) mice were definitely decreased, despite a significant increase of adrenaline (ADR) and noradrenaline (NA) production. A change of cardiac structure caused by the death of cardiomyocytes and an increased expression of matrix metalloprotease (MMP)-2 and -9 were also found. Moreover, lipid peroxidation and the production of tumor necrosis factor-alpha (TNF-α) in the heart were increased. Finally, all vitamin C-insufficient Gulo(-/-) mice were expired within 2 weeks. Interestingly, all of the findings in vitamin C-insufficient Gulo(-/-) mice were completely prevented by the supplementation of a sufficient amount of vitamin C. Taken together, vitamin C insufficiency increases the risk of stress-induced cardiac damage with structural and functional changes arising from the apoptosis of cardiomyocytes.
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Affiliation(s)
- Hyemin Kim
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Seyeon Bae
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Yejin Kim
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Chung-Hyun Cho
- Department of Pharmacology, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Sung Joon Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea; Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Yong-Jin Kim
- Cardiovascular Center, Seoul National University Hospital, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Seung-Pyo Lee
- Cardiovascular Center, Seoul National University Hospital, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Hang-Rae Kim
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Young-Il Hwang
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Jae Seung Kang
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea.
| | - Wang Jae Lee
- Laboratory of Vitamin C and Antioxidant Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea.
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Krasilnikova OA, Kavok NS, Babenko NA. Drug-induced and postnatal hypothyroidism impairs the accumulation of diacylglycerol in liver and liver cell plasma membranes. BMC PHYSIOLOGY 2002; 2:12. [PMID: 12182762 PMCID: PMC126221 DOI: 10.1186/1472-6793-2-12] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2002] [Accepted: 08/16/2002] [Indexed: 11/17/2022]
Abstract
BACKGROUND Thyroid hormones are well known modulators of signal transduction. The effect of hyper- and hypo-thyroidism on diacylglycerol/protein kinase C (DAG/PKC) signaling in cardiomiocytes has been determined. Triiodothyronine (T3) has been shown to prevent the alpha1-adrenoreceptor-mediated activation of PKC but does not alter the stimulation of enzyme and hepatic metabolism by phorbol ethers. It has been suggested that the elevation of endogenous DAG in senescent or hypothyroid cells changes the PKC-dependent response of cells to phorbol esters and hormones. In the present study, was examined the formation of DAG and activation of PKC in liver cells from rats of different thyroid status. RESULTS The results obtained provide the first demonstration of DAG accumulation in liver and cell plasma membranes at age- and drug-dependent thyroid gland malfunction. The experiments were performed in either the [14C]CH3COOH-labeled rat liver, liver slices or hepatocytes labeled by [14C] oleic acid and [3H]arachidonic acid or [14C]palmitic acid as well as in the isolated liver cell plasma membranes of 90- and 720-day-old rats of different thyroid status. The decrease of T4 and T3 levels in blood serum of 720-day-old rats and mercazolil-treated animals was associated with increases of both the DAG mass in liver and liver cell plasma membranes and newly synthesized [14C]DAG level in liver and isolated hepatocytes. Hypothyroidism decreased PKC activity in both membrane and cytosol as well as phospholipid and triacylglycerol synthesis in liver. These hypothyroidism effects were restored in liver by injection of T4. T4 administration to the intact animals of different ages decreased the DAG level in liver and isolated plasma membranes and the content of newly synthesized DAG in liver. The reduction of DAG level in liver was not associated with increasing free fatty acid level. DAG labeling ratio 14C/3H in liver slices of rats of different thyroid state sharply differed from PL. DAG was relatively enriched in [14C]oleic acid whereas PL were enriched in [3H]arachidonic acid. CONCLUSIONS The above data have indicated that thyroid hormones are important physiological modulators of DAG level in rat liver and cell plasma membranes. Age- and drug-induced malfunction of thyroid gland resulted in a prominent decrease of glycerolipid synthesis which may promote DAG accumulation in liver.
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Affiliation(s)
- Oksana A Krasilnikova
- Kharkov National University, Institute of Biology, 4, Svobody pl., Kharkov, 61077, Ukraine
| | - Nataliya S Kavok
- Kharkov National University, Institute of Biology, 4, Svobody pl., Kharkov, 61077, Ukraine
| | - Nataliya A Babenko
- Kharkov National University, Institute of Biology, 4, Svobody pl., Kharkov, 61077, Ukraine
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