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Ricci G, Ciccone MM, Giordano P, Cortese F. Statins: Pharmacokinetics, Pharmacodynamics and Cost-Effectiveness Analysis. Curr Vasc Pharmacol 2020; 17:213-221. [PMID: 29984667 DOI: 10.2174/1570161116666180706144824] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/22/2018] [Accepted: 01/23/2018] [Indexed: 11/22/2022]
Abstract
Cardiovascular diseases secondary to atherosclerosis are the primary causes of early death and disability worldwide and dyslipidaemia represents one of the most important modifiable risk factors. Among lipid abnormalities that define it, low-density lipoprotein cholesterol (LDL-C) is the primary target of therapy, since multiple randomized controlled trials have shown the positive impact of its reduction on atherosclerosis development. For their ability to lower LDL-C levels, statins are the most studied drugs in cardiovascular disease prevention, of proven utility in slowing the progression or even determining regression of atherosclerosis. In addition, they have ancillary proprieties, with positive effects on the mechanisms involved in the development of atherosclerosis and cardiovascular morbidity and mortality, the so-called "pleiotropic mechanisms". Although sharing the same mechanism of action, the different chemical and pharmacological characteristics of each kind of statins affect their absorption, bioavailability, plasma protein binding properties, excretion and solubility. In this overview, we analysed pharmacokinetic and pharmacodynamic mechanisms of this class of drugs, specifying the differences among the molecules, along with the economic aspects. Detailed knowledge of characteristics and differences of each kind of available statin could help the physician in the correct choice, based also on patient's clinical profile, of this essential tool with a demonstrated high cost-effectiveness both in primary than in the secondary prevention of cardiovascular disease.
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Affiliation(s)
- Gabriella Ricci
- Cardiovascular Diseases Section, "Monsignor Dimiccoli" Hospital, Barletta, Italy
| | - Marco Matteo Ciccone
- Cardiovascular Diseases Section, Department of Emergency and Organ Transplantation (DETO), University of Bari, Bari, Italy
| | - Paola Giordano
- Department of Biomedical Sciences and Human Oncology, University of Bari, Bari, Italy
| | - Francesca Cortese
- Cardiovascular Diseases Section, "Monsignor Dimiccoli" Hospital, Barletta, Italy
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Yamasaki T, Iwashima Y, Jesmin S, Ohta Y, Kusunoki H, Hayashi SI, Horio T, Kawano Y. Comparison of efficacy of intensive versus mild pitavastatin therapy on lipid and inflammation biomarkers in hypertensive patients with dyslipidemia. PLoS One 2014; 9:e89057. [PMID: 24586502 PMCID: PMC3929641 DOI: 10.1371/journal.pone.0089057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 01/13/2014] [Indexed: 01/18/2023] Open
Abstract
Objective Intensive as compared to mild statin therapy has been proven to be superior in improving cardiovascular outcome, whereas the effects of intensive statin therapy on inflammation and lipoprotein biomarkers are not well defined. Methods This study assigned essential hypertensive patients with dyslipidemia to 6 months administration of mild (1 mg/day, n = 34) or intensive pitavastatin therapy (4 mg/day, n = 29), and various lipid and inflammation biomarkers were measured at baseline, and 3 and 6 months after the start of treatment. Results Both pitavastatin doses were well tolerated, and there were no serious treatment-related adverse events. After 6 months, significant improvements in total cholesterol, triglycerides, low-density lipoprotein (LDL-) cholesterol, LDL/high-density lipoprotein cholesterol (LDL/HDL), apolipoproteins B, C-II, and E, apolipoprotein-B/apolipoprotein-A-I (Apo B/Apo A-I), and malondialdehyde (MDA-) LDL were observed in both groups. Compared with the mild pitavastatin group, the intensive pitavastatin therapy showed significantly greater decreases in C reactive protein (F = 3.76, p<0.05), total cholesterol (F = 10.65), LDL-cholesterol (F = 23.37), LDL/HDL (F = 12.34), apolipoproteins B (F = 19.07) and E (F = 6.49), Apo B/Apo A-I (F = 13.26), and MDA-LDL (F = 5.76) (p<0.01, respectively). Conclusion Intensive pitavastatin therapy may have a more favorable effect not only in decreasing LDL-cholesterol but also in pleiotropic benefits in terms of improvement of apolipoproteins, inflammation, or oxidation.
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Affiliation(s)
- Tomohiro Yamasaki
- Division of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
| | - Yoshio Iwashima
- Division of Hypertension and Nephrology, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
- * E-mail:
| | - Subrina Jesmin
- Faculty of Medicine, University of Tsukuba, Tsukuba City, Ibaragi, Japan
| | - Yuko Ohta
- Division of Hypertension and Nephrology, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
| | - Hiroshi Kusunoki
- Division of Hypertension and Nephrology, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
| | - Shin-ichiro Hayashi
- Division of Hypertension and Nephrology, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
| | - Takeshi Horio
- Department of General Internal Medicine 3, Kawasaki Medical School, Okayama City, Okayama, Japan
| | - Yuhei Kawano
- Division of Hypertension and Nephrology, National Cerebral and Cardiovascular Center, Suita City, Osaka, Japan
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Abstract
3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) are established first line treatments for hypercholesterolaemia. In addition to the direct effects of statins in reducing concentrations of atherogenic low density lipoprotein cholesterol (LDL-C), several studies have indicated that the beneficial effects of statins may be due to some of their cholesterol-independent, multiple (pleiotropic) effects which may differ between different members of the class. Pitavastatin is a novel synthetic lipophilic statin that has a number of pharmacodynamic and pharmacokinetic properties distinct from those of other statins, which may underlie its potential pleiotropic benefits in reducing cardiovascular risk factors. This review examines the principal pleiotropic effects of pitavastatin on endothelial function, vascular inflammation, oxidative stress and thrombosis. The article is based on a systematic literature search carried out in December 2010, together with more recent relevant publications where appropriate. The available data from clinical trials and in vitro and animal studies suggest that pitavastatin is not only effective in reducing LDL-C and triglycerides, but also has a range of other effects. These include increasing high density lipoprotein cholesterol, decreasing markers of platelet activation, improving cardiac, renal and endothelial function, and reducing endothelial stress, lipoprotein oxidation and, ultimately, improving the signs and symptoms of atherosclerosis. It is concluded that the diverse pleiotropic actions of pitavastatin may contribute to reducing cardiovascular morbidity and mortality beyond that achieved through LDL-C reduction.
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Affiliation(s)
- Jean Davignon
- Hyperlipidemia and Atherosclerosis Research Group, Clinical Research Institute of Montréal (IRCM) and University of Montréal, QC, Canada.
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Kitahara M, Kanaki T, Ishii I, Saito Y. Atherosclerosis induced by chronic inhibition of the synthesis of nitric oxide in moderately hypercholesterolaemic rabbits is suppressed by pitavastatin. Br J Pharmacol 2010; 159:1418-28. [PMID: 20233214 DOI: 10.1111/j.1476-5381.2009.00630.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND AND PURPOSE It is not clear if the new 3-hydroxyl-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor pitavastatin prevents atherogenesis by a direct effect. Statins have a cholesterol-lowering effect, so an accessible animal model of atherosclerosis showing only moderate hypercholesterolaemia as in humans, is needed. The effects of pitavastatin were evaluated on atherosclerotic lesions accumulating foam cells derived from macrophages, produced in rabbits with moderate hypercholesterolaemia by chronic inhibition of nitric oxide synthase (NOS). EXPERIMENTAL APPROACH White New Zealand rabbits were fed a 0.2% cholesterol diet with the NOS inhibitor N(omega)-nitro-L-arginine methyl ester (L-NAME) in the same diet. Pitavastatin (0.1 and 0.3 mg x kg(-1)) was given orally once a day for 8 weeks. The aortic arch and thoracic aorta were analysed by histochemistry and atherosclerotic lesions were quantified. The effect of pitavastatin on adhesion of THP-1 cells to endothelial cells, and cholesterol content in RAW264.7 cells incubated with oxidized or acetylated LDL were also investigated. KEY RESULTS Atherosclerotic lesions containing foam cells were induced in a model of atherosclerosis in rabbits with moderate hypercholesterolaemia by chronic inhibition of NOS. The area of atherosclerotic lesions was diminished by pitavastatin administration. The adhesion of THP-1 cells and cholesteryl ester content in RAW macrophages were decreased by pitavastatin treatment. CONCLUSION Atherosclerosis induced by chronic inhibition of NOS in moderately hypercholesterolaemic rabbits was suppressed by pitavastatin via inhibition of macrophage accumulation and macrophage foam cell formation.
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Affiliation(s)
- Masaki Kitahara
- Biological Research Laboratories, Nissan Chemical Industries Ltd., 1470 Shiraoka, Minamisaitama, Saitama, Japan
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AL-NAQEEB GHANYA, ISMAIL MAZNAH. REGULATION OF APOLIPOPROTEIN A-1 AND APOLIPOPROTEIN B100 GENES BY THYMOQUINONE RICH FRACTION AND THYMOQUINONE IN HEPG2 CELLS. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1745-4522.2009.01144.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Zhang B, Matsunaga A, Rainwater DL, Miura SI, Noda K, Nishikawa H, Uehara Y, Shirai K, Ogawa M, Saku K. Effects of rosuvastatin on electronegative LDL as characterized by capillary isotachophoresis: the ROSARY Study. J Lipid Res 2008; 50:1832-41. [PMID: 19056704 DOI: 10.1194/jlr.m800523-jlr200] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Electronegative LDL, a charge-modified LDL (cm-LDL) subfraction that is more negatively charged than normal LDL, has been shown to be inflammatory. We previously showed that pravastatin and simvastatin reduced the electronegative LDL subfraction, fast-migrating LDL (fLDL), as analyzed by capillary isotachophoresis (cITP). The present study examined the effects of rosuvastatin on the more electronegative LDL subfraction, very-fast-migrating LDL (vfLDL), and small, dense charge-modified LDL (sd-cm-LDL) subfractions. Patients with hypercholesterolemia or those who were being treated with statins (n = 81) were treated with or switched to 2.5 mg/d rosuvastatin for 3 months. Rosuvastatin treatment effectively reduced cITP cm-LDL subfractions of LDL (vfLDL and fLDL) or sdLDL (sd-vfLDL and sd-fLDL), which were closely related to each other but were different from the normal subfraction of LDL [slow-migrating LDL (sLDL)] or sdLDL (sd-sLDL) in their relation to the levels of remnant-like particle cholesterol (RLP-C), apolipoprotein (apo) C-II, and apoE. The percent changes in cm-LDL or sd-cm-LDL caused by rosuvastatin were correlated with those in the particle concentrations of LDL or sdLDL measured as LDL-apoB or sdLDL-apoB and the levels of HDL-C, RLP-C, apoC-II, and apoE. In conclusion, rosuvastatin effectively reduced both the vfLDL subfraction and sd-cm-LDL subfractions as analyzed by cITP.
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Affiliation(s)
- Bo Zhang
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan
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Yoshitomi Y, Ishii T, Kaneki M, Tsujibayashi T, Sakurai SI, Nagakura C, Miyauchi A. Efficacy of a Low Dose of Pitavastatin Compared with Atorvastatin in Primary Hyperlipidemia: Results of a 12-week, open label study. J Atheroscler Thromb 2006; 13:108-13. [PMID: 16733299 DOI: 10.5551/jat.13.108] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Pitavastatin has a potent cholesterol-lowering action. The clinical efficacy and safety of a low dose, 1 mg, of pitavastatin were examined. METHODS The effect of 12 weeks' treatment with pitavastatin 1 mg in an open label, non-randomized trial involving 137 patients with hypercholesterolemia as compared with treatment with atorvastatin 10 mg. RESULTS Total cholesterol, low-density lipoprotein (LDL) cholesterol, high density lipoprotein (HDL) cholesterol and triglyceride (TG) levels at baseline did not differ between the two groups. At follow-up, there were no significant differences in total cholesterol, LDL cholesterol and HDL cholesterol levels between the groups. The TG levels at follow-up were higher in the pitavastatin group than atorvastatin group (p < 0.01). In patients with hyperlipidemia type IIa, TG levels at follow-up were lower in the atorvastatin subgroup (p < 0.01). However, there was no significant difference in TG levels at follow-up between the two subgroups in patients with hyperlipidemia type IIb. CONCLUSION Pitavastatin 1 mg daily was safe and efficacious in reducing LDL cholesterol levels as compared with atorvastatin 10 mg daily. Further randomized comparative studies are needed to clarify the effect of a low dose of pitavastatin.
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Affiliation(s)
- Yuji Yoshitomi
- Miyauchi Makoto Memorial Clinic, 9-44 Isumi-cho, Mishima, Shizuoka 411-0037, Japan.
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Abstract
The growing number of trials that have highlighted the benefit of intensive lowering of total- and low density lipoprotein (LDL)-cholesterol levels especially with statins has created a need for more efficacious agents. Pitavastatin is a new synthetic 3-hydroxy-3-methyl glutaryl coenzyme A reductase inhibitor, which was developed, and has been available in Japan since July 2003. Metabolism of pitavastatin by the cytochrome P450 (CYP) system is minimal, principally through CYP 2C9, with little involvement of the CYP 3A4 isoenzyme, potentially reducing the risk of drug-drug interactions between pitavastatin and other drugs known to inhibit CYP enzymes. To date, human and animal studies have shown pitavastatin to be potentially as effective in lowering LDL-cholesterol levels as rosuvastatin; although, head-to-head studies are yet to be conducted.
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Affiliation(s)
- R Y A Mukhtar
- Diabetes and Lipid Research, Wolfson Centre, Royal United Hospital, Coombe Park, Bath BA1 3NG, UK
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Kajinami K, Takekoshi N, Saito Y. Pitavastatin: efficacy and safety profiles of a novel synthetic HMG-CoA reductase inhibitor. CARDIOVASCULAR DRUG REVIEWS 2004; 21:199-215. [PMID: 12931254 DOI: 10.1111/j.1527-3466.2003.tb00116.x] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The use of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors, statins, has been shown to reduce major cardiovascular events in both primary and secondary prevention, and statins became one of the most widely prescribed classes of drugs throughout the world. Previously, statins have been well tolerated and have shown favorable safety profiles. However, the voluntary withdrawal of cerivastatin from the market because of a disproportionate number of reports of rhabdomyolysis-associated deaths drew attention to the pharmacokinetic profile of statins, which may possibly have been related to serious drug-drug interactions. Pitavastatin (NK-104, previously called itavastatin or nisvastatin, Kowa Company Ltd., Tokyo) is a novel, fully synthetic statin, which has a potent cholesterol-lowering action. The short-term and long-term lipid-modifying effects of pitavastatin have already been investigated in subjects with primary hypercholesterolemia, heterozygous familial hypercholesterolemia, hypertriglyceridemia, and type-2 diabetes mellitus accompanied by hyperlipidemia. Within the range of daily doses from 1 to 4 mg, the efficacy of pitavastatin as a lipid-lowering drug seems to be similar, or potentially superior, to that of atorvastatin. According to the results of pharmacokinetic studies, pitavastatin showed favorable and promising safety profile; it was only slightly metabolized by the cytochrome P450 (CYP) system, its lactone form had no inhibitory effects on the CYP3A4-mediated metabolism of concomitantly administered drugs; P-glycoprotein-mediated transport did not play a major role in its disposition, and pitavastatin did not inhibit P-glycoprotein activity. It could be concluded that pitavastatin could provide a new and potentially better therapeutic choice for lipid-modifying therapy than do the currently available statins. The efficacy and safety of higher dose treatment, as well as its long-term effects in the prevention of coronary artery disease, should be further investigated.
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Affiliation(s)
- Kouji Kajinami
- Department of Cardiology, Kanazawa Medical University, Daigaku 1-1, Uchinada-machi 920-0293, Japan.
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Fan P, Zhang B, Kuroki S, Saku K. Pitavastatin, a Potent Hydroxymethylglutaryl Coenzyme a Reductase Inhibitor, Increases Cholesterol 7 .ALPHA.-Hydroxylase Gene Expression in HepG2 Cells. Circ J 2004; 68:1061-6. [PMID: 15502389 DOI: 10.1253/circj.68.1061] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND The effect of pitavastatin on the mRNA levels of apolipoprotein (apo) A-I, peroxisome proliferator-activated receptor alpha (PPARalpha), cholesterol 7alpha-hydroxylase (CYP7A1), and farnesoid X receptor (FXR) in HepG2 cells was examined to establish whether pitavastatin affects bile acid synthesis and if so, to determine a possible molecular mechanism. METHODS AND RESULTS HepG2 cells were cultured in serum-free Dulbecco's modified Eagle medium for 18 h before drug treatment. Total RNA was extracted at set times and mRNA levels were quantified by reverse transcription-real time polymerase chain reaction. Pitavastatin at 0.1, 1, 5, and 10 micromol/L increased the mRNA levels of apo A-I, PPARalpha, CYP7A1, and FXR in a dose-dependent manner. The mRNA levels of apo A-I, PPAR alpha, CYP7A1, and FXR similarly increased with increasing doses of pitavastatin. Coincubation of mevalonate (4 mmol/L) with pitavastatin (5 micromol/L) reversed the inductive effects of pitavastatin on the mRNA levels of these genes, indicating that the inductive effects of pitavastatin were related to its inhibition of HMG-CoA reductase. CONCLUSIONS Pitavastatin increased the mRNA levels of CYP7A1 in HepG2 cells, suggesting that increased conversion of cholesterol to bile acids may be the mechanism for its potent low-density lipoprotein cholesterol-lowering effects.
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Affiliation(s)
- Ping Fan
- Department of Cardiology, Fukuoka University School of Medicine, , 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
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Hiyoshi H, Yanagimachi M, Ito M, Yasuda N, Okada T, Ikuta H, Shinmyo D, Tanaka K, Kurusu N, Yoshida I, Abe S, Saeki T, Tanaka H. Squalene synthase inhibitors suppress triglyceride biosynthesis through the farnesol pathway in rat hepatocytes. J Lipid Res 2003; 44:128-35. [PMID: 12518031 DOI: 10.1194/jlr.m200316-jlr200] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We recently demonstrated that squalene synthase (SQS) inhibitors reduce plasma triglyceride through an LDL receptor-independent mechanism in Watanabe heritable hyperlipidemic rabbits (Hiyoshi et al. 2001. Eur. J. Pharmacol. 431: 345-352). The present study deals with the mechanism of the inhibition of triglyceride biosynthesis by the SQS inhibitors ER-27856 and RPR-107393 in rat primary cultured hepatocytes. Atorvastatin, an HMG-CoA reductase inhibitor, had no effect on triglyceride biosynthesis, but reversed the inhibitory effect of the SQS inhibitors. A squalene epoxidase inhibitor, NB-598, affected neither triglyceride biosynthesis nor its inhibition by ER-27856 and RPR-107393. The reduction of triglyceride biosynthesis by ER-27856 and RPR-107393 was potentiated by mevalonolactone supplementation. Treatment of hepatocytes with farnesol and its derivatives reduced triglyceride biosynthesis. In addition, we found that ER-27856 and RPR-107393 significantly reduced the incorporation of [1-(14)C]acetic acid into oleic acid, but not the incorporation of [1-(14)C]oleic acid into triglyceride. Though ER-27856 and RPR-107393 increased mitochondrial fatty acid beta-oxidation, the inhibition of beta-oxidation by RS-etomoxir had little effect on their inhibition of triglyceride biosynthesis. These results suggest that SQS inhibitors reduce triglyceride biosynthesis by suppressing fatty acid biosynthesis via an increase in intracellular farnesol and its derivatives.
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Sone H, Takahashi A, Shimano H, Ishibashi S, Yoshino G, Morisaki N, Saito Y, Kawazu S, Teramoto T, Fujita T, Shiba T, Iwamoto Y, Kuzuya N, Akanuma Y, Yamada N. HMG-CoA reductase inhibitor decreases small dense low-density lipoprotein and remnant-like particle cholesterol in patients with type-2 diabetes. Life Sci 2002; 71:2403-12. [PMID: 12231401 DOI: 10.1016/s0024-3205(02)02038-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Patients with type 2 diabetes are known to have abnormalities in their remnant metabolism and low density lipoprotein (LDL) subfraction pattern, with a preponderance of small dense LDL. The effects of pitavastatin, a newly synthesized 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitor, on lipoprotein profiles in patients with type 2 diabetes were determined. Thirty-three patients were treated with pitavastatin with a daily dose of 2 mg for 8 weeks. After treatment, triglyceride, total and LDL cholesterol were significantly reduced by 28.7 +/- 36.7%, 25.2 +/- 14.3% and 36.1 +/- 14.3%, respectively. Remnant-like particle cholesterol (RLP-C), an independent risk factor for CAD which is known to be elevated in diabetic patients, was also significantly reduced (-30.9 +/- 30.5%) by the treatment and this decrease correlated well with the decrease in triglyceride level. The proportion of small dense LDL, which is known for its atherogenisity, decreased from 29.9 +/- 26.2% to 19.7 +/- 22.7% and the mean LDL particle size significantly increased from 26.36 +/- 1.13 nm to 27.10 +/- 1.36 nm. Pitavastatin, which is known to improve triglyceride levels and cholesterol levels, also improves RLP-C level and LDL subfraction profiles, and this in turn may reduce the cardiovascular risk in patients with type 2 diabetes and dyslipidemia.
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Affiliation(s)
- Hirohito Sone
- Department of Internal Medicine (Endocrinology/Metabolism), Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8575, Ibaraki, Japan
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