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Shimada A, Kimura H, Oida K, Kanehara H, Bando Y, Sakamoto S, Wakasugi T, Saga T, Ito Y, Kamiyama K, Mikami D, Iwano M, Hirano T, Yoshida H. Serum CETP status is independently associated with reduction rates in LDL-C in pitavastatin-treated diabetic patients and possible involvement of LXR in its association. Lipids Health Dis 2016; 15:57. [PMID: 26984517 PMCID: PMC4794860 DOI: 10.1186/s12944-016-0223-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 03/05/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Statins decrease cholesteryl ester transfer protein (CETP) levels, which have been positively associated with hepatic lipid content as well as serum low density lipoproteins-cholesterol (LDL-C) levels. However, the relationship between the CETP status and statin-induced reductions in LDL-C levels has not yet been elucidated in detail. We herein examined the influence of the CETP status on the lipid-reducing effects of pitavastatin in hypercholesterolemic patients with type 2 diabetes mellitus as well as the molecular mechanism underlying pitavastatin-induced modifications in CETP levels. METHODS Fifty-three patients were treated with 2 mg of pitavastatin for 3 months. Serum levels of LDL-C, small dense (sd) LDL-C, and CETP were measured before and after the pitavastatin treatment. The effects of pitavastatin, T0901317, a specific agonist for liver X receptor (LXR) that reflects hepatic cholesterol contents, and LXR silencing on CETP mRNA expression in HepG2 cells were also examined by a real-time PCR assay. RESULTS The pitavastatin treatment decreased LDL-C, sdLDL-C, and CETP levels by 39, 42, and 23%, respectively. Despite the absence of a significant association between CETP and LDL-C levels at baseline, baseline CETP levels and its percentage change were an independent positive determinant for the changes observed in LDL-C and sdLDL-C levels. The LXR activation with T0901317 (0.5 μM), an in vitro condition analogous to hepatic cholesterol accumulation, increased CETP mRNA levels in HepG2 cells by approximately 220%, while LXR silencing markedly diminished the increased expression of CETP. Pitavastatin (5 μM) decreased basal CETP mRNA levels by 21%, and this was completely reversed by T0901317. CONCLUSION Baseline CETP levels may predict the lipid-reducing effects of pitavastatin. Pitavastatin-induced CETP reductions may be partially attributed to decreased LXR activity, predictable by the ensuing decline in hepatic cholesterol synthesis. TRIAL REGISTRATION UMIN Clinical Trials Registry ID UMIN000019020.
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Affiliation(s)
- Akihiro Shimada
- Department of Clinical Laboratory and Nephrology, University of Fukui Hospital, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan
| | - Hideki Kimura
- Department of Clinical Laboratory and Nephrology, University of Fukui Hospital, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan.
| | - Koji Oida
- Division of Internal Medicine, Fukui Chuo Clinic, 4-5-10, Matsumoto, Fukui, 910-0003, Japan
| | - Hideo Kanehara
- Division of Endocrinology, Fukui-ken Saiseikai Hospital, 7-1, Funahashi, Wadanaka, 918-8503, Japan
| | - Yukihiro Bando
- Division of Endocrinology, Fukui-ken Saiseikai Hospital, 7-1, Funahashi, Wadanaka, 918-8503, Japan
| | - Shinobu Sakamoto
- Division of Internal Medicine, Yasukawa Hospital, 2-108, Owada, Fukui, 910-0005, Japan
| | - Takanobu Wakasugi
- Division of Endocrinology, Fukui Prefectural Hospital, 2-8-1, Yotsui, Fukui, 910-8526, Japan
| | - Takashi Saga
- Division of Internal Medicine, Tanaka Hospital, 2-3-1 Ohte, Fukui, Fukui, 910-0005, Japan
| | - Yasuki Ito
- Research and Development Department, Denka Seiken Co. Ltd, Tokyo, Japan
| | - Kazuko Kamiyama
- Division of Nephrology, Department of Medicine, School of Medicine, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan
| | - Daisuke Mikami
- Division of Nephrology, Department of Medicine, School of Medicine, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan
| | - Masayuki Iwano
- Division of Nephrology, Department of Medicine, School of Medicine, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan
| | - Tsutomu Hirano
- Department of Medicine, Division of Diabetes, Metabolism, and Endocrinology, Showa University School of Medicine, Tokyo, Japan
| | - Haruyoshi Yoshida
- Division of Nephrology, Department of Medicine, School of Medicine, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-shimoaizuki, Eiheiji, Yoshida, Fukui, 910-1193, Japan.,Division of Nephrology, Obama Municipal Hospital, 2-2 Ohte, Obama, Fukui, 917-8567, Japan
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Khabour OF, Alomari MA, Alzoubi KH, Gharaibeh MY, Alhashimi FH. Lack of Association between Polymorphisms of Hepatic Lipase with Lipid Profile in Young Jordanian Adults. Lipid Insights 2014; 7:1-5. [PMID: 25278769 PMCID: PMC4167487 DOI: 10.4137/lpi.s14798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 03/04/2014] [Accepted: 03/11/2014] [Indexed: 11/29/2022] Open
Abstract
The human hepatic lipase (LIPC) gene encodes hepatic lipase, an enzyme involved in lipoprotein metabolism and regulation. Therefore, variants in LIPC gene may influence plasma lipoprotein levels. In this study, the association of LIPC C-514T and G-250A polymorphisms with plasma lipid profiles in 348 young Jordanians was investigated. Genotyping of C-514T and G-250A was performed by polymerase chain reaction and subsequent digestion with DraI and NiaIII restriction enzymes, respectively, while Roche analyzer was used to determine plasma total cholesterol, triglycerides, low-and high-density lipoprotein. The G-250 and C-514 alleles were most abundant in Jordanians with 79 and 80% frequencies, respectively. Additionally, no difference was found in the lipid–lipoprotein profile between the different genotype groups of C-514T or G-250A polymorphisms, even when males and females were examined separately (P > 0.05). In young Jordanian adults, the examined LIPC polymorphisms seem to play a limited role in determining the lipid profile.
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Affiliation(s)
- Omar F Khabour
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Mahmoud A Alomari
- Department of Rehabilitation Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Karem H Alzoubi
- Department of Clinical Pharmacy, Jordan University of Science and Technology, Irbid, Jordan
| | - Mohammad Y Gharaibeh
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Farah H Alhashimi
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan
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Miksztowicz V, McCoy MG, Schreier L, Cacciagiú L, Elbert A, Gonzalez AI, Billheimer J, Eacho P, Rader DJ, Berg G. Endothelial Lipase Activity Predicts High-Density Lipoprotein Catabolism in Hemodialysis. Arterioscler Thromb Vasc Biol 2012; 32:3033-40. [DOI: 10.1161/atvbaha.112.300110] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective—
A novel phospholipase assay was used to measure for the first time the behavior of endothelial and hepatic phospholipase activities in postheparin human plasma of hemodialyzed patients and its relationship with atherogenic and antiatherogenic lipoprotein levels.
Methods and Results—
Endothelial and hepatic phospholipase activity was assessed in a total SN1-specific phospholipase assay, using (1-decanoylthio-1-deoxy-2-decanoyl-sn-glycero-3-phosphoryl) ethylene glycol as the substrate. Hemodialyzed patients presented lower values of total and hepatic phospholipase activity than controls: 4.4 (1.9–9.0) versus 7.5 (3.6–18.0) and 2.6 (0.7–6.2) versus 6.6 (1.3–15.2) μmol of fatty acid released per milliliter of postheparin plasma per hour, respectively (
P
<0.001); however, endothelial lipase (EL) phospholipase activity was increased in patients: 1.7 (0.8–3.0) versus 1.1 (0.1–2.7) μmol of fatty acid released per milliliter of postheparin plasma per hour (
P
=0.008). EL was negatively associated with high-density lipoprotein (HDL)-cholesterol (
r
=–0.427;
P
=0.001), and apolipoprotein A-I levels, total phospholipase, and hepatic lipase activity were directly associated with low-density lipoprotein-cholesterol and apolipoprotein B. The association of EL and HDL-cholesterol remained significant when adjusting for waist circumference (β=–0.26;
P
=0.05), and the effect of hepatic lipase on low-density lipoprotein-cholesterol continued after adjusting for age (β=0.46;
P
= 0.001).
Conclusion—
Our results support the hypothesis that EL is the predominant enzyme responsible for lipolytic catabolism of HDLs in hemodialyzed patients and resolve the apparent paradox observed between low hepatic lipase activity and decreased HDL-cholesterol levels observed in these patients. In addition, the ability to assess total hepatic lipase and EL phospholipase activity in plasma will increase our knowledge of the mechanisms involved in controlling HDL levels and cardiovascular risk in hemodialyzed patients, as well as other populations with low levels of HDL-cholesterol.
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Affiliation(s)
- Veronica Miksztowicz
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Mary G. McCoy
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Laura Schreier
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Leonardo Cacciagiú
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Alicia Elbert
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Ana Inés Gonzalez
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Jeffrey Billheimer
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Patrick Eacho
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Daniel J. Rader
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
| | - Gabriela Berg
- From the Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina (V.M., L.S., L.C., A.I.G., G.B.); Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, Philadelphia, PA (M.G.M., J.B., D.J.R.); Kidney Disease Center and Arterial Hypertension (CEREHA), Buenos Aires, Argentina (A.E.); and Lilly Research Laboratories, Eli Lilly and Company,
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