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Norum KR, Remaley AT, Miettinen HE, Strøm EH, Balbo BEP, Sampaio CATL, Wiig I, Kuivenhoven JA, Calabresi L, Tesmer JJ, Zhou M, Ng DS, Skeie B, Karathanasis SK, Manthei KA, Retterstøl K. Lecithin:cholesterol acyltransferase: symposium on 50 years of biomedical research from its discovery to latest findings. J Lipid Res 2020; 61:1142-1149. [PMID: 32482717 PMCID: PMC7397740 DOI: 10.1194/jlr.s120000720] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/21/2020] [Indexed: 01/04/2023] Open
Abstract
LCAT converts free cholesterol to cholesteryl esters in the process of reverse cholesterol transport. Familial LCAT deficiency (FLD) is a genetic disease that was first described by Kaare R. Norum and Egil Gjone in 1967. This report is a summary from a 2017 symposium where Dr. Norum recounted the history of FLD and leading experts on LCAT shared their results. The Tesmer laboratory shared structural findings on LCAT and the close homolog, lysosomal phospholipase A2. Results from studies of FLD patients in Finland, Brazil, Norway, and Italy were presented, as well as the status of a patient registry. Drs. Kuivenhoven and Calabresi presented data from carriers of genetic mutations suggesting that FLD does not necessarily accelerate atherosclerosis. Dr. Ng shared that LCAT-null mice were protected from diet-induced obesity, insulin resistance, and nonalcoholic fatty liver disease. Dr. Zhou presented multiple innovations for increasing LCAT activity for therapeutic purposes, whereas Dr. Remaley showed results from treatment of an FLD patient with recombinant human LCAT (rhLCAT). Dr. Karathanasis showed that rhLCAT infusion in mice stimulates cholesterol efflux and suggested that it could also enhance cholesterol efflux from macrophages. While the role of LCAT in atherosclerosis remains elusive, the consensus is that a continued study of both the enzyme and disease will lead toward better treatments for patients with heart disease and FLD.
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Affiliation(s)
- Kaare R Norum
- Department of Nutrition, University of Oslo, Oslo, Norway
| | | | - Helena E Miettinen
- Department of Medicine, University of Helsinki and University Central Hospital, Helsinki, Finland
| | - Erik H Strøm
- Departments of Pathology Oslo University Hospital, Oslo, Norway
| | - Bruno E P Balbo
- Division of Nephrology and Molecular Medicine Department of Medicine, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Carlos A T L Sampaio
- Division of Nephrology and Molecular Medicine Department of Medicine, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Ingrid Wiig
- Centre for Rare Disorders, Oslo University Hospital, Oslo, Norway
| | - Jan Albert Kuivenhoven
- Department of Pediatrics, Section Molecular Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Laura Calabresi
- Center E. Grossi Paoletti, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - John J Tesmer
- Department of Biological Sciences, Purdue University, West Lafayette, IN
| | - Mingyue Zhou
- Cardiometabolic Disorder Research, AMGEN, San Francisco, CA
| | - Dominic S Ng
- Department of Medicine, University of Toronto and Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
| | - Bjørn Skeie
- Anesthesiology, Oslo University Hospital, Oslo, Norway
| | | | - Kelly A Manthei
- Life Sciences Institute, University of Michigan, Ann Arbor, MI
| | - Kjetil Retterstøl
- Department of Nutrition, University of Oslo, Oslo, Norway .,Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Lipid Clinic, Oslo University Hospital, Oslo, Norway
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Miettinen HE, Rönö K, Koivusalo SB, Eriksson JG, Gylling H. Effect of gestational diabetes mellitus on newborn cholesterol metabolism. Atherosclerosis 2018; 275:346-351. [PMID: 30015298 DOI: 10.1016/j.atherosclerosis.2018.06.879] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND AIMS Impaired glucose metabolism during pregnancy may associate with changes in fetal cholesterol metabolism. We investigated if gestational diabetes mellitus (GDM) affects newborn cholesterol metabolism as determined by cord blood squalene and non-cholesterol sterols. Furthermore, we examined potential correlations between cord blood and maternal serum non-cholesterol sterols. METHODS Pregnant women at risk for GDM (BMI>30 kg/m2) were enrolled from maternity clinics in Finland. GDM was determined from the results of an oral glucose tolerance test. Serum samples were taken in the third trimester of pregnancy, and cord blood samples collected from their newborns at birth. Squalene and non-cholesterol sterols were analyzed from serum and cord blood by gas liquid chromatography. All women with GDM were in good glycaemic control. RESULTS The ratios of squalene and non-cholesterol sterols to cholesterol (100 × μmol/mmol of cholesterol) in cord blood did not differ between the infants born to mothers with GDM (n = 15) or mothers with normal glucose tolerance (n = 13). The ratios of sitosterol and campesterol to cholesterol in the cord blood correlated with the corresponding maternal serum ratios (r = 0.70, p < 0.0001) in both groups. CONCLUSIONS In obese women under good glycaemic control, GDM did not affect newborn cholesterol metabolism. Cord blood sitosterol and campesterol ratios to cholesterol correlated with the corresponding maternal serum ratios thus potentially reflecting maternal-fetal cholesterol transport.
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Affiliation(s)
- Helena E Miettinen
- University of Helsinki and Helsinki University Hospital, Endocrinology, Finland.
| | - Kristiina Rönö
- University of Helsinki and Helsinki University Hospital, Obstetrics and Gynaecology, Women's Hospital, P.O. Box 140 Haartmaninkatu 2, 00029 HUS, Finland
| | - Saila B Koivusalo
- University of Helsinki and Helsinki University Hospital, Obstetrics and Gynaecology, Women's Hospital, P.O. Box 140 Haartmaninkatu 2, 00029 HUS, Finland
| | - Johan G Eriksson
- University of Helsinki and Helsinki University Hospital, General Practice and Primary Health Care, Folkhälsan Research Center, P.O. Box 20 (Tukholmankatu 8 B, 6. Fl), Biomedicum, Helsinki, 00014, Finland; University of Helsinki National Institute for Health and Welfare, Chronic Disease Prevention, Finland
| | - Helena Gylling
- University of Helsinki and Helsinki University Hospital, Internal Medicine, P.O. BOX 700, 00029 HUS, Helsinki, Finland
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Miettinen HE, Sane T, Lamminen A, Välimäki MJ. [Osteosclerosis associated with hepatitis C]. Duodecim 2017; 133:881-885. [PMID: 29240322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We describe the first Finnish case of hepatitis C associated osteosclerosis. In which the patient's bone symptoms and bone density were resolved with hepatitis C treatment. Suspecting the possibility of osteosclerosis underlying bone pains in a hepatitis C patient is well-founded, although osteoporotic fractures are a more common problem.
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Miettinen HE, Rönö K, Koivusalo S, Stach-Lempinen B, Pöyhönen-Alho M, Eriksson JG, Hiltunen TP, Gylling H. Elevated serum squalene and cholesterol synthesis markers in pregnant obese women with gestational diabetes mellitus. J Lipid Res 2014; 55:2644-54. [PMID: 25301963 DOI: 10.1194/jlr.p049510] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We examined serum cholesterol synthesis and absorption markers and their association with neonatal birth weight in obese pregnancies affected by gestational diabetes mellitus (GDM). Pregnant women at risk for GDM (BMI >30 kg/m²) were enrolled from maternity clinics in Finland. GDM was determined from the results of an oral glucose tolerance test. Serum samples were collected at six time-points, one in each trimester of pregnancy, and at 6 weeks, 6 months, and 12 months postpartum. Analysis of serum squalene and noncholesterol sterols by gas-liquid chromatography revealed that in subjects with GDM (n = 22), the serum Δ8-cholestenol concentration and lathosterol/sitosterol ratio were higher (P < 0.05) than in the controls (n = 30) in the first trimester, reflecting increased cholesterol synthesis. Also, subjects with GDM had an increased ratio of squalene to cholesterol (100 × μmol/mmol of cholesterol) in the second (11.5 ± 0.5 vs. 9.1 ± 0.5, P < 0.01) and third (12.1 ± 0.8 vs. 10.0 ± 0.7, P < 0.05) trimester. In GDM, the second trimester maternal serum squalene concentration correlated with neonatal birth weight (r = 0.70, P < 0.001). In conclusion, in obesity, GDM associated with elevated serum markers of cholesterol synthesis. Correlation of maternal serum squalene with neonatal birth weight suggests a potential contribution of maternal cholesterol synthesis to newborn weight in GDM.
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Affiliation(s)
- Helena E Miettinen
- Department of Medicine, Division of Internal Medicine, University of Helsinki, Biomedicum Helsinki, Helsinki, Finland
| | - Kristiina Rönö
- Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Helsinki, Finland
| | - Saila Koivusalo
- Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Helsinki, Finland
| | - Beata Stach-Lempinen
- Department of Obstetrics and Gynecology, South-Karelia Central Hospital, Lappeenranta, Finland
| | - Maritta Pöyhönen-Alho
- Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Helsinki, Finland
| | - Johan G Eriksson
- Department of General Practice and Primary Health Care, University of Helsinki, Helsinki, Finland
| | - Timo P Hiltunen
- Department of Medicine, Division of Internal Medicine, University of Helsinki, Biomedicum Helsinki, Helsinki, Finland
| | - Helena Gylling
- Department of Medicine, Division of Internal Medicine, University of Helsinki, Biomedicum Helsinki, Helsinki, Finland
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Gylling H, Hallikainen M, Simonen P, Miettinen HE, Nissinen MJ, Miettinen TA. Serum and lipoprotein sitostanol and non-cholesterol sterols after an acute dose of plant stanol ester on its long-term consumption. Eur J Nutr 2011; 51:615-22. [PMID: 21947207 DOI: 10.1007/s00394-011-0249-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Accepted: 09/09/2011] [Indexed: 12/01/2022]
Abstract
PURPOSE Chronic inhibition of cholesterol absorption with large doses of plant stanol esters (staest) alters profoundly cholesterol metabolism, but it is unknown how an acute inhibition with a large staest dose alters the postprandial serum and lipoprotein cholesterol precursor, plant sterol, and sitostanol contents. METHODS Hypercholesterolemic subjects, randomly and double-blind divided into control (n = 18) and intervention groups (n = 20), consumed experimental diet without and with staest (plant stanols 8.8 g/day) for 10 weeks. Next morning after a fasting blood sample (0 h), the subjects had a breakfast without or with staest (4.5 g of plant stanols). Blood sampling was repeated 4 h later. Lipoproteins were separated with ultracentrifugation, and sterols were measured with gas-liquid chromatography. RESULTS In 0-h chylomicrons and VLDL, plant sterols were lower in staest than in controls. Postprandially, cholestenol (cholesterol synthesis marker) was reduced in chylomicrons in staest compared with controls (-0.13 ± 0.04 μg/dL vs. 0.01 ± 0.08 μg/dL, P < 0.05). Staest decreased postprandially avenasterol in chylomicrons (P < 0.05 from 0 h). Sitostanol was high at 0 h by chronic staest in serum and VLDL but not in chylomicrons. Postprandial sitostanol was increased by staest in VLDL only. CONCLUSIONS Chronic cholesterol absorption inhibition with large amount of plant stanol esters decreases plant sterols in triglyceride-rich lipoproteins. Acute plant stanol ester consumption increases sitostanol content in triglyceride-rich lipoproteins but suggests to decrease the risk of plant sterol and plant stanol accumulation into vascular wall by chylomicrons.
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Affiliation(s)
- H Gylling
- Department of Medicine, Division of Internal Medicine, University of Helsinki, Biomedicum Helsinki C 4 22, P.O. BOX 700, 00029, HUS, Helsinki, Finland.
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Miettinen HE, Piippo K, Hannila-Handelberg T, Paukku K, Hiltunen TP, Gautschi I, Schild L, Kontula K. Licorice-induced hypertension and common variants of genes regulating renal sodium reabsorption. Ann Med 2010; 42:465-74. [PMID: 20597806 DOI: 10.3109/07853890.2010.499133] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIM To study if gene alterations affecting renal sodium reabsorption associate with susceptibility to licorice-induced hypertension. METHODS Finnish subjects (n = 30) with a previously documented incident of licorice-induced hypertension were recruited for the study using a newspaper announcement. Their previous clinical and family histories as well as serum electrolyte levels were examined. DNA samples from all individuals were screened for variants of the genes encoding 11beta-hydroxysteroid dehydrogenase type 2 (11betaHSD2) and alpha-, beta-, and gamma-subunits of the epithelial sodium channel (ENaC). RESULTS Upon licorice predisposition, the patients had a mean blood pressure of 201/118 mmHg. Circulating potassium, renin, and aldosterone levels were low. No significant DNA variations were identified in the 11betaHSD2 gene. Four subjects were heterozygous for beta- and gammaENaC variants previously shown to be associated with hypertension. Furthermore, a novel G insertion (2004-2005insG) in the SCNN1A gene encoding the alphaENaC was identified in two subjects. The frequency of these ENaC variants was significantly higher in subjects with licorice-induced hypertension (6/30 i.e. 20%) than in blood donors (11/301 i.e. 3.7%, P = 0.002). CONCLUSIONS Defects of the 11betaHSD2 gene do not constitute a likely cause for licorice-induced hypertension. Variants of the ENaC subunits may render some individuals sensitive to licorice-induced metabolic alterations and hypertension.
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Hiltunen TP, Suonsyrjä T, Hannila-Handelberg T, Paavonen KJ, Miettinen HE, Strandberg T, Tikkanen I, Tilvis R, Pentikäinen PJ, Virolainen J, Kontula K. Predictors of antihypertensive drug responses: initial data from a placebo-controlled, randomized, cross-over study with four antihypertensive drugs (The GENRES Study). Am J Hypertens 2007; 20:311-8. [PMID: 17324745 DOI: 10.1016/j.amjhyper.2006.09.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Revised: 09/01/2006] [Accepted: 09/03/2006] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Only a minority of hypertensive individuals is adequately controlled for their hypertension, partially because reliable predictors for efficient antihypertensive drug therapy are lacking. METHODS In a prospective, randomized, double-blind, cross-over, placebo-controlled study (The GENRES Study), 208 moderately hypertensive Finnish men (aged 35 to 60 years) were treated for 4 weeks with antihypertensive drugs from four different classes: amlodipine (5 mg), bisoprolol (5 mg), hydrochlorothiazide (25 mg), or losartan (50 mg) daily. Each individual received each of the four monotherapies in a randomized order. Four-week placebo periods were included before and between drug treatment periods. Antihypertensive responses were assessed with 24-h ambulatory and office measurements and analyzed according to age, body mass index, triceps skin fold thickness, waist-to-hip ratio, duration of hypertension, number of previous antihypertensive drugs, number of affected parents, and blood pressure (BP) levels, and profiles during placebo periods. RESULTS The median BP responses in 24-h ambulatory recordings (systolic/diastolic) were 11/8 mm Hg for bisoprolol, 9/6 mm Hg for losartan, 7/5 mm Hg for amlodipine, and 5/2 mm Hg for hydrochlorothiazide. The highest pairwise within-subject correlations in BP responses were seen for the combinations of bisoprolol-losartan and amlodipine-hydrochlorothiazide. The BP responses to bisoprolol and losartan did not vary according to the variables. Amlodipine and hydrochlorothiazide responses were positively correlated with age, placebo BP level, and lower night-time dipping on placebo. CONCLUSIONS Baseline clinical and BP parameters may be used to predict the efficacy of antihypertensive therapies. The GENRES Study material should provide an excellent platform for future pharmacogenetic analyses of antihypertensive drug responsiveness.
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Affiliation(s)
- Timo P Hiltunen
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, Helsinki, Finland
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Hannila-Handelberg T, Kontula K, Tikkanen I, Tikkanen T, Fyhrquist F, Helin K, Fodstad H, Piippo K, Miettinen HE, Virtamo J, Krusius T, Sarna S, Gautschi I, Schild L, Hiltunen TP. Common variants of the beta and gamma subunits of the epithelial sodium channel and their relation to plasma renin and aldosterone levels in essential hypertension. BMC Med Genet 2005; 6:4. [PMID: 15661075 PMCID: PMC547905 DOI: 10.1186/1471-2350-6-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Accepted: 01/20/2005] [Indexed: 11/25/2022]
Abstract
Background Rare mutations of the epithelial sodium channel (ENaC) result in the monogenic hypertension form of Liddle's syndrome. We decided to screen for common variants in the ENaC βand γ subunits in patients with essential hypertension and to relate their occurrence to the activity of circulating renin-angiotensin-aldosterone system. Methods Initially, DNA samples from 27 patients with low renin/low aldosterone hypertension were examined. The DNA variants were subsequently screened for in 347 patients with treatment-resistant hypertension, 175 male subjects with documented long-lasting normotension and 301 healthy
Plasma renin and aldosterone levels were measured under baseline conditions and during postural and captopril challenge tests. Results Two commonly occurring βENaC variants (G589S and a novel intronic i12-17CT substitution) and one novel γENaC variant (V546I) were detected. One of these variants occurred in a heterozygous form in 32 patients, a prevalence (9.2%) significantly higher than that in normotensive males (2.9%, p = 0.007) and blood donors (3.0%, p = 0.001). βENaC i12-17CT was significantly more prevalent in the hypertension group than in the two control groups combined (4.6% vs. 1.1%, p = 0.001). When expressed in Xenopus oocytes, neither of the two ENaC amino acid-changing variants showed a significant difference in activity compared with ENaC wild-type. No direct evidence for a mRNA splicing defect could be obtained for the βENaC intronic variant. The ratio of daily urinary potassium excretion to upright and mean (of supine and upright values) plasma renin activity was higher in variant allele carriers than in non-carriers (p = 0.034 and p = 0.048). Conclusions At least 9% of Finnish patients with hypertension admitted to a specialized center carry genetic variants of β and γENaC, a three times higher prevalence than in the normotensive individuals or in random healthy controls. Patients with the variant alleles showed an increased urinary potassium excretion rate in relation to their renin levels.
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Affiliation(s)
- Tuula Hannila-Handelberg
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Kimmo Kontula
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Ilkka Tikkanen
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Tuula Tikkanen
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Frej Fyhrquist
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Karri Helin
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Heidi Fodstad
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Kirsi Piippo
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Helena E Miettinen
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
| | - Jarmo Virtamo
- Department of Epidemiology and Health Promotion, National Public Health Institute, 00300 Helsinki, Finland
| | - Tom Krusius
- The Finnish Red Cross Blood Service, 00310 Helsinki, Finland
| | - Seppo Sarna
- Department of Public Health, University of Helsinki, 00014 Helsinki, Finland
| | - Ivan Gautschi
- Institute of Pharmacology and Toxicology, University of Lausanne, 1005 Lausanne, Switzerland
| | - Laurent Schild
- Institute of Pharmacology and Toxicology, University of Lausanne, 1005 Lausanne, Switzerland
| | - Timo P Hiltunen
- Department of Medicine, University of Helsinki, and Biomedicum Helsinki, University of Helsinki, 00290 Helsinki, Finland
- Helsinki University Central Hospital, Jorvi Hospital, 02740 Espoo, Finland
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Braun A, Zhang S, Miettinen HE, Ebrahim S, Holm TM, Vasile E, Post MJ, Yoerger DM, Picard MH, Krieger JL, Andrews NC, Simons M, Krieger M. Probucol prevents early coronary heart disease and death in the high-density lipoprotein receptor SR-BI/apolipoprotein E double knockout mouse. Proc Natl Acad Sci U S A 2003; 100:7283-8. [PMID: 12771386 PMCID: PMC165867 DOI: 10.1073/pnas.1237725100] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2002] [Accepted: 04/17/2003] [Indexed: 12/20/2022] Open
Abstract
Mice with homozygous null mutations in the high-density lipoprotein receptor SR-BI (scavenger receptor class B, type I) and apolipoprotein E genes fed a low-fat diet exhibit a constellation of pathologies shared with human atherosclerotic coronary heart disease (CHD): hypercholesterolemia, occlusive coronary atherosclerosis, myocardial infarctions, cardiac dysfunction (heart enlargement, reduced systolic function and ejection fraction, and ECG abnormalities), and premature death (mean age 6 weeks). They also exhibit a block in RBC maturation and abnormally high plasma unesterified-to-total cholesterol ratio (0.8) with associated abnormal lipoprotein morphology (lamellar/vesicular and stacked discoidal particles reminiscent of those in lecithin/cholesterol acyltransferase deficiency and cholestasis). Treatment with the lipid-lowering, antiatherosclerosis, and antioxidation drug probucol extended life to as long as 60 weeks (mean 36 weeks), and at 5-6 weeks of age, virtually completely reversed the cardiac and most RBC pathologies and corrected the unesterified to total cholesterol ratio (0.3) and associated distinctive abnormal lipoprotein morphologies. Manipulation of the timing of administration and withdrawal of probucol could control the onset of death and suggested that critical pathological changes usually occurred in untreated double knockout mice between approximately 3 (weaning) and 5 weeks of age and that probucol delayed heart failure even after development of substantial CHD. The ability of probucol treatment to modulate pathophysiology in the double knockout mice enhances the potential of this murine system for analysis of the pathophysiology of CHD and preclinical testing of new approaches for the prevention and treatment of cardiovascular disease.
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Affiliation(s)
- Anne Braun
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract
Because cholesterol is a precursor for the synthesis of steroid hormones, steroidogenic tissues have evolved multiple pathways to ensure adequate supplies of cholesterol. These include synthesis, storage as cholesteryl esters, and import from lipoproteins. In addition to endocytosis via members of the low-density lipoprotein receptor superfamily, steroidogenic cells acquire cholesterol from lipoproteins by selective lipid uptake. This pathway, which does not involve lysosomal degradation of the lipoprotein, is mediated by the scavenger receptor class B type I (SR-BI). SR-BI is highly expressed in steroidogenic cells, where its expression is regulated by various trophic hormones, as well as in the liver. Studies of genetically manipulated strains of mice have established that SR-BI plays a key role in regulating lipoprotein metabolism and cholesterol transport to steroidogenic tissues and to the liver for biliary secretion. In addition, analysis of SR-BI-deficient mice has shown that SR-BI expression is important for alpha-tocopherol and nitric oxide metabolism, as well as normal red blood cell maturation and female fertility. These mouse models have also revealed that SR-BI can protect against atherosclerosis. If SR-BI plays similar physiological and pathophysiological roles in humans, it may be an attractive target for therapeutic intervention in cardiovascular and reproductive diseases.
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Affiliation(s)
- Attilio Rigotti
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica, Santiago, Chile
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Miettinen HE, Kontula K. [Genes, HDL cholesterol and risk of coronary artery disease]. Duodecim 2002; 115:869-74. [PMID: 11859519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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Miettinen HE, Rayburn H, Krieger M. Abnormal lipoprotein metabolism and reversible female infertility in HDL receptor (SR-BI)-deficient mice. J Clin Invest 2001; 108:1717-22. [PMID: 11733567 PMCID: PMC200987 DOI: 10.1172/jci13288] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2001] [Accepted: 10/08/2001] [Indexed: 01/25/2023] Open
Abstract
Mammalian female fertility depends on complex interactions between the ovary and the extraovarian environment (e.g., the hypothalamic-hypophyseal ovarian axis). The role of plasma lipoproteins in fertility was examined using HDL-receptor SR-BI knockout (KO) mice. SR-BI KO females have abnormal HDLs, ovulate dysfunctional oocytes, and are infertile. Fertility was restored when the structure and/or quantity of abnormal HDL was altered by inactivating the apoAI gene or administering the cholesterol-lowering drug probucol. This suggests that abnormal lipoprotein metabolism can cause murine infertility--implying a functional hepatic-ovarian axis--and may contribute to some forms of human female infertility.
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Affiliation(s)
- H E Miettinen
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Miettinen HE, Paunu N, Rantala I, Kalimo H, Paljärvi L, Helin H, Haapasalo H. Cell cycle regulators (p21, p53, pRb) in oligodendrocytic tumors: a study by novel tumor microarray technique. J Neurooncol 2001; 55:29-37. [PMID: 11804280 DOI: 10.1023/a:1012961918848] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Using the novel tissue microarray technique, we studied immunohistochemical expression of cell cycle regulators p53, p21, pRb in 42 grade II oligodendrogliomas, 16 grade III anaplastic oligodendrogliomas, 10 primary and 4 recidive grade II oligoastrocytomas, 10 grade III oligoastrocytomas and 2 other grade II mixed gliomas. The p53 immunopositivity associated with malignant histology of the tumor (p = 0.01, Mann-Whitney test) and high pRb expression (p = 0.015). The p21 score associated strongly with histological grade (p < 0.001). The immunopositive tumors had a significantly higher rate of proliferation (p = 0.021). The p21 immunopositivity correlated positively with p53 immunopositivity: among the 33 p21 immunopositive tumors 30 (91%) were p53 immunopositive and only 3 were p53 immunonegative (p = 0.017). Patients with p21 immunonegative primary tumors had significantly better prognosis: among them 42 of the 46 (91%) survived, whereas only 18 of the 30 patients (60%) with p21 immunopositive primary tumors survived until the follow-up date (p = 0.0017). Statistical significance was reached in multivariate analysis as well (p = 0.01, exp(B) = 5.5). The pRb immunopositive tumors had higher proliferation rate than immunonegative tumors (p = 0.002). In multivariate variance analysis, comparing the effects of different regulatory proteins on cell proliferation, only the amount of pRb expression reached statistical significance (p = 0.004). In conclusion, the expression of p21 in oligodendrocytic tumors seems to be upregulated by p53 expression which rises with cell proliferation and malignancy as in attempt to halt cell cycle but seems to be overrun by other factors. The amount of p21 expression has independent prognostic significance and could be used in diagnosis to help the difficult evaluation of the malignancy potential of oligodendrogliomas and oligoastrocytomas.
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Affiliation(s)
- H E Miettinen
- Department of Pathology, Tampere University Hospital, Finland.
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Mardones P, Quiñones V, Amigo L, Moreno M, Miquel JF, Schwarz M, Miettinen HE, Trigatti B, Krieger M, VanPatten S, Cohen DE, Rigotti A. Hepatic cholesterol and bile acid metabolism and intestinal cholesterol absorption in scavenger receptor class B type I-deficient mice. J Lipid Res 2001; 42:170-80. [PMID: 11181745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
The scavenger receptor class B type I (SR-BI), which is expressed in the liver and intestine, plays a critical role in cholesterol metabolism in rodents. While hepatic SR-BI expression controls high density lipoprotein (HDL) cholesterol metabolism, intestinal SR-BI has been proposed to facilitate cholesterol absorption. To evaluate further the relevance of SR-BI in the enterohepatic circulation of cholesterol and bile salts, we studied biliary lipid secretion, hepatic sterol content and synthesis, bile acid metabolism, fecal neutral sterol excretion, and intestinal cholesterol absorption in SR-BI knockout mice. SR-BI deficiency selectively impaired biliary cholesterol secretion, without concomitant changes in either biliary bile acid or phospholipid secretion. Hepatic total and unesterified cholesterol contents were slightly increased in SR-BI-deficient mice, while sterol synthesis was not significantly changed. Bile acid pool size and composition, as well as fecal bile acid excretion, were not altered in SR-BI knockout mice. Intestinal cholesterol absorption was somewhat increased and fecal sterol excretion was slightly decreased in SR-BI knockout mice relative to controls. These findings establish the critical role of hepatic SR-BI expression in selectively controlling the utilization of HDL cholesterol for biliary secretion. In contrast, SR-BI expression is not essential for intestinal cholesterol absorption.
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Affiliation(s)
- P Mardones
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica, Santiago, Chile
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15
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Miettinen HE, Järvinen TA, Kellner U, Kauraniemi P, Parwaresch R, Rantala I, Kalimo H, Paljärvi L, Isola J, Haapasalo H. High topoisomerase IIalpha expression associates with high proliferation rate and and poor prognosis in oligodendrogliomas. Neuropathol Appl Neurobiol 2000; 26:504-12. [PMID: 11123716 DOI: 10.1046/j.1365-2990.2000.00282.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The role of molecular markers predicting the prognosis and the selection of patients for further adjuvant therapies is not well established in oligodendroglioma patients. A potential prognostic as well as a therapeutically predictive factor, topoisomerase IIalpha (topoIIalpha), is a molecular target for certain cytotoxic drugs. Its expression has been shown to correlate with the prognosis in a number of different cancers and with the chemosensitivity of cancer cells in vitro. The expression of topoIIalpha was evaluated immunohistochemically in 59 oligodendrogliomas and in 29 mixed gliomas with a predominating oligodendroglioma component by the use of a tissue microarray technique. In the gliomas, the percentage of topoIIalpha immunopositive cells protein expression varied from 0.0 to 49.1% (5.2 +/- 8.3%, mean+/- SD). In oligoastrocytomas, the mean topoIIalpha score was significantly higher in the oligodendroglioma than in the astrocytoma component of the tumour (5.37 +/- 5.58% vs. 1.89 +/- 2.49%, P = 0.018). A significant association was found between the high proportion of topoIIalpha positive cells and high grade of the tumour (P < 0.0001), high tumour proliferation rate (P < 0.0001), p53 overexpression (P = 0.01) and high expression of tumour suppressing retinoblastoma protein (P = 0.023). TopoIIalpha expression was not associated with the age or sex of patient, and the rate of apoptosis. TopoIIalpha expression associated highly significantly with patient prognosis; a significantly higher proportion of patients with low rather than with high topoIIalpha score was alive at the end of the 5-year follow-up (P = 0.03). Cox analysis was used to demonstrate that topoIIalpha had an independent prognostic value for survival (P = 0.034). In conclusion, high topoIIalpha expression characterizes oligodendrogliomas and oligoastrocytomas which are poorly differentiated, have high proliferation rate, and has prognostic value for overall survival of these patients. Therefore, topoIIalpha may be a useful marker for better targeted selection of poor prognosis oligodendroglioma patients for adjuvant therapy.
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Affiliation(s)
- H E Miettinen
- Department of Pathology, Tampere University Hospital, Tampere,
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Miettinen HE, Gylling H, Tenhunen J, Virtamo J, Jauhiainen M, Huttunen JK, Kantola I, Miettinen TA, Kontula K. Molecular genetic study of Finns with hypoalphalipoproteinemia and hyperalphalipoproteinemia: a novel Gly230 Arg mutation (LCAT[Fin]) of lecithin:cholesterol acyltransferase (LCAT) accounts for 5% of cases with very low serum HDL cholesterol levels. Arterioscler Thromb Vasc Biol 1998; 18:591-8. [PMID: 9555865 DOI: 10.1161/01.atv.18.4.591] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In an attempt to identify genetic factors underlying extreme alterations of serum HDL cholesterol (HDL-C) concentrations, we examined two probands with HDL-C levels <0.2 mmol/L and subsequently screened two large cohorts of smoking men, one with very low (0.2 to 0.7 mmol/L, n=156) and the other with elevated (1.9 to 3.6 mmol/L, n=160) HDL-C levels, for the newly detected mutations as well as some other mutations proposed to affect HDL-C levels. One of the probands had corneal opacities, microalbuminuria, hypertriglyceridemia, and reduced LDL apoprotein B concentration; the other had anemia and presented with stomatocytosis in his peripheral blood. The first proband was found to be homozygous for a novel LCAT Gly230Arg (LCAT[Fin]) mutation, and the second was homozygous for an Arg399Cys mutation we described previously. Transient expression of the mutant LCAT(Fin) cDNA in COS cells disclosed markedly diminished LCAT enzyme activity. In the low-HDL-C group of men (n=156), 8 carriers of LCAT(Fin) and 1 carrier of the LCAT Arg399Cys were identified. In addition, the frequency of the lipoprotein lipase (LPL) Asn291Ser mutation was significantly (P<.05) higher in the low-HDL-C group (4.8%) than in the high-HDL-C group (1.6%). In addition, we identified 1 carrier of the intron 14G-->A mutation of cholesterol ester transfer protein (CETP) in the high-HDL-C group and subsequently demonstrated cosegregation of the mutant allele with elevated HDL-C levels in the proband's family. In conclusion, we have identified a novel LCAT gene Gly230Arg mutation (LCAT[Fin]), which, together with the LPL Asn291Ser mutation, represents a relatively common genetic cause of diminishing HDL-C levels, at least among Finns. This article also reports occurrence of a CETP mutation in subjects having non-Japanese roots.
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Affiliation(s)
- H E Miettinen
- Department of Medicine, University of Helsinki, Finland
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Miettinen HE, Jauhiainen M, Gylling H, Ehnholm S, Palomäki A, Miettinen TA, Kontula K. Apolipoprotein A-IFIN (Leu159-->Arg) mutation affects lecithin cholesterol acyltransferase activation and subclass distribution of HDL but not cholesterol efflux from fibroblasts. Arterioscler Thromb Vasc Biol 1997; 17:3021-32. [PMID: 9409289 DOI: 10.1161/01.atv.17.11.3021] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We showed earlier that the apolipoprotein A-I Leu159-->Arg mutation (apoA-IFin) results in dominantly inherited hypoalphalipoproteinemia. In the present study we investigated the effect of the apoA-IFin mutation on lipoprotein profile, apoA-I kinetics, lecithin:cholesterol acyltransferase (LCAT) activation, and cholesterol efflux in vitro. Carriers (n = 9) of the apoA-IFin mutation exhibited several lipoprotein abnormalities. The serum HDL cholesterol level was diminished to 20% of normal, and nondenaturing gradient gel electrophoresis of HDL showed disappearance of particles at the 9.0- to 12-nm size range (HDL2-type) and the presence of small 7.8- to 8.9-nm (mostly HDL3-type) particles only. HDL3-type particles from both the mutation carriers and nonaffected family members were similarly converted to large, HDL2-type particles by phospholipid transfer protein in vitro. Studies on apoA-I kinetics in four affected subjects favored accelerated catabolism of apoA-I. Experiments with reconstituted proteoliposomes showed that the capacity of apoA-IFin protein to activate LCAT was reduced to 40% of that of the wild-type apoA-I. The impact of the apoA-IFin protein on cholesterol efflux was examined in vitro using [3H]cholesterol-loaded human fibroblasts and three different cholesterol acceptors: (1) total HDL, (2) total apoA-I combined with phospholipid, and (3) apoA-I isoform (apoA-IFin or wild-type apoA-I isoform 1) combined with phospholipid. ApoA-IFin did not impair phospholipid binding or cholesterol efflux from fibroblasts to any of the acceptors used. Only one of the nine apoA-IFin carriers appears to have evidence of clinically manifested atherosclerosis. In conclusion, although the apoA-IFin mutation does not alter the properties of apoA-I involved in promotion of cholesterol efflux, its ability to activate LCAT in vitro is defective. In vivo, apoA-IFin was found to be associated with several lipoprotein composition rearrangements and increased catabolism of apoA-I.
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Affiliation(s)
- H E Miettinen
- Department of Medicine, University of Helsinki, Finland.
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Gylling H, Kontula K, Koivisto UM, Miettinen HE, Miettinen TA. Polymorphisms of the genes encoding apoproteins A-I, B, C-III, and E and LDL receptor, and cholesterol and LDL metabolism during increased cholesterol intake. Common alleles of the apoprotein E gene show the greatest regulatory impact. Arterioscler Thromb Vasc Biol 1997; 17:38-44. [PMID: 9012635 DOI: 10.1161/01.atv.17.1.38] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Genetic and dietary factors regulate serum cholesterol level, but detailed investigations into their interactions have not been established. We assessed the effects of apoprotein (apo) E phenotype and polymorphic alleles of the apo A-I, apo B, apo C-III, and LDL receptor genes, separately and together, on regulation of serum LDL cholesterol level. The study group consisted of 29 middle-aged men, and cholesterol absorption, bile acid, and cholesterol synthesis and LDL apo B kinetics were studied in these men during low- and high-cholesterol diets. The six apo B alleles were identified on the basis of Xba I, EcoRI, and Msp I restriction fragment length polymorphism (RFLP), the apo A-I alleles with the Msp I RFLP, and the apo C-III and LDL receptor alleles corresponded to the Sst I and PvuII RPLPs of these genes, respectively. During low cholesterol intake, LDL cholesterol levels were similar in all of the genetic groups except for men with apo E2 phenotype. They had significantly (P < .05) lower levels of LDL apo B and cholesterol than men without the epsilon 2 allele. The low values were caused by a significantly higher removal of LDL apo B (apo E2, 0.453 +/- 0.03 versus apo E3, 0.312 +/- 0.01 pools per day, P < .05). High cholesterol intake increased LDL cholesterol levels in all genetic categories except in the apo E2 phenotype irrespective of the combinations with other polymorphisms. Carriers of the apo B R+ allele (EcoRI site present) presented with the most prominent LDL cholesterol rise (from 2.71 +/- 0.14 to 3.37 +/- 0.29 mmol/L). In multiple stepwise regression analysis, apo B EcoRI RFLP and apo E phenotypes were the only variables that explained the variability of high cholesterol intake-induced change in LDL cholesterol levels. In summary, in any genetic combination, individuals with the epsilon 2 allele had the lowest LDL cholesterol values and were nonresponders to dietary cholesterol, whereas subjects with the apo B R+ allele had marked LDL elevations, especially in combination with the epsilon 4.
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Affiliation(s)
- H Gylling
- Department of Medicine, University of Helsinki, Finland
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Miettinen HE, Gylling H, Miettinen TA, Viikari J, Paulin L, Kontula K. Apolipoprotein A-IFin. Dominantly inherited hypoalphalipoproteinemia due to a single base substitution in the apolipoprotein A-I gene. Arterioscler Thromb Vasc Biol 1997; 17:83-90. [PMID: 9012641 DOI: 10.1161/01.atv.17.1.83] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have identified a large kindred with severe serum HDL cholesterol deficiency. The proband, a 65-year-old woman, had greatly diminished concentrations of serum HDL cholesterol (0.19 mmol/L) and apolipoprotein (apo) A-I (21.9 mg/dL). HDL cholesterol and apo A-I levels were similarly reduced in all affected family members, while apo A-II levels were about half of those in the nonaffected family members. Pedigree analysis suggested a dominant inheritance pattern of the phenotype. Sequence analysis of the exons and exon-intron boundaries of the apo A-I gene revealed heterozygosity for a single T-to-G point mutation substituting arginine for leucine at residue 159 of the mature apo A-I protein (apo A-IFin). The T-to-G substitution destroys an Fsp I cleavage site, permitting direct polymerase chain reaction/restriction enzyme analysis of the mutation. All the affected family members were shown to be heterozygous for the apo A-IFin mutation. Isoelectric focusing revealed the presence of the mutant apo A-IFin protein in both serum and HDL of the affected subjects. Functional consequences of the mutation were examined by expressing the mutated and wild-type apo A-I cDNAs in COS-7 cells. The mutant apo A-I mRNA had a size similar to that of the normal mRNA, and both mutant and wild-type apo A-I proteins were secreted into the cell media. In vivo kinetic studies of apo A-I revealed increased catabolism in affected subjects. In conclusion, we describe a novel point mutation of the apo A-I gene, apo A-IFin, causing a dominantly negative phenotype as regards serum HDL levels, possibly due to increased catabolism of apo A-I.
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Affiliation(s)
- H E Miettinen
- Institute of Biotechnology, University of Helsinki, Finland.
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Gylling H, Relas H, Miettinen HE, Radhakrishnan R, Miettinen TA. Delayed postprandial retinyl palmitate and squalene removal in a patient heterozygous for apolipoprotein A-IFIN mutation (Leu 159-->Arg) and low HDL cholesterol level without coronary artery disease. Atherosclerosis 1996; 127:239-43. [PMID: 9125314 DOI: 10.1016/s0021-9150(96)05961-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A low HDL cholesterol level is frequently but not consistently associated with inefficient postprandial fat clearance. We studied triglycerides, retinyl palmitate and squalene and apolipoprotein B-48 after a fat loading test in one subject heterozygous for a novel point mutation of apolipoprotein A-I (A-IFIN, Leu 159-->Arg) and low HDL cholesterol level without coronary artery disease, and in 16 healthy controls with the same apolipoprotein E phenotype, 3/3, as the proband. HDL cholesterol and apolipoprotein A-I levels were 0.32 mmol/l and 57 mg/dl in the proband, and 1.29 +/- 0.12 mmol/l (mean +/- S.E.) and 126 +/- 4 mg/dl in the controls. The peak concentration for triglycerides in plasma, chylomicrons and VLDL occurred at 4 h both in the case and controls. However, the peak concentrations for retinyl palmitate and squalene in chylomicrons and VLDL were delayed to 12 h in the proband compared with 4 and 9 h in the controls. The peak of apolipoprotein B-48 occurred at 6 h in the proband and at 4 h in the controls, so that triglycerides, apolipoprotein B-48 and retinyl palmitate and squalene peaked differently. After 24 h, retinyl palmitate, squalene, and apolipoprotein B-48 had returned to the baseline levels. The results show for the first time an impaired postprandial lipoprotein removal in a case heterozygote with moderately low HDL cholesterol due to an apolipoprotein A-1 mutation not associated with coronary artery disease.
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Affiliation(s)
- H Gylling
- Department of Medicine, University of Helsinki, Finland
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Miettinen HE, Korpela K, Hämäläinen L, Kontula K. Polymorphisms of the apolipoprotein and angiotensin converting enzyme genes in young North Karelian patients with coronary heart disease. Hum Genet 1994; 94:189-92. [PMID: 7913911 DOI: 10.1007/bf00202868] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The genes encoding apolipoproteins (apos) A-I, B, C-III and E as well as that encoding the angiotensin converting enzyme (ACE) have been proposed as candidate genes for coronary heart disease (CHD). We determined the common polymorphisms of the apo genes, previously found to influence serum lipid levels at the population level, and the insertion/deletion polymorphism of the ACE gene, recently reported to reflect the risk of myocardial infarction, in 82 very young (mean, 41 years) North Karelian Finns with symptomatic CHD and 50 controls of similar age. Patients with familial hypercholesterolemia had been excluded from this material. None of the polymorphisms examined, including the apo A-I promoter MspI, apo C-III SstI and apo B XbaI restriction fragment polymorphisms, a common variation of apo E (epsilon 2, epsilon 3 and epsilon 4 alleles) and an ACE insertion/deletion (I/D) polymorphism, was significantly associated with the risk of premature CHD. Patients with CHD had a higher mean serum LDL cholesterol/HDL cholesterol ratio than controls (3.15 +/- 1.30 vs 2.72 +/- 0.98, P < 0.05), but no significant associations between the common apo gene polymorphisms and serum lipid levels were disclosed in either group. It is possible that other genetic loci than those proposed to be associated with accelerated atherosclerosis may be more important as risk factors of symptomatic CHD at the age of 40 years.
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Affiliation(s)
- H E Miettinen
- Institute of Biotechnology, University of Helsinki, Finland
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Louhija J, Miettinen HE, Kontula K, Tikkanen MJ, Miettinen TA, Tilvis RS. Aging and genetic variation of plasma apolipoproteins. Relative loss of the apolipoprotein E4 phenotype in centenarians. Arterioscler Thromb 1994; 14:1084-9. [PMID: 8018664 DOI: 10.1161/01.atv.14.7.1084] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We determined the common polymorphism of apolipoprotein E (E2, E3, and E4), apolipoprotein B Xba I polymorphism, and apolipoprotein C-III Sst I polymorphism in almost all Finnish centenarians alive in 1991 (n = 179/185). Plasma lipid and lipoprotein levels in different apolipoprotein genotypes were also measured. In comparison with younger Finnish populations studied previously, the frequency of the apolipoprotein E epsilon 2 allele was almost twice as high (7.0% versus 4.1%; P < .05) and that of the epsilon 4 allele only approximately one third as high (8.4% versus 22.7%; P < .001) in the centenarians. Plasma cholesterol and high-density lipoprotein cholesterol levels tended to be lowest in the group with the epsilon 2 allele (4.33 mmol/L and 1.41 mmol/L, respectively), intermediate in those with the epsilon 3 allele (4.57 mmol/L and 1.48 mmol/L, respectively), and highest in those with the epsilon 4 allele (4.82 mmol/L and 1.60 mmol/L, respectively). The frequencies of the apolipoprotein B X1 and X2 alleles (Xba I restriction site absent or present, respectively) among the centenarians and among the young Finns were not significantly different, whereas the apolipoprotein C-III S2 allele (Sst I restriction site present) occurred more often in the centenarians (frequency, 12.9%) than in the youngest reference population (frequency, 8.8%; P < .05). Centenarians with the apolipoprotein B X2X2 genotype and apolipoprotein E4 phenotype had a higher mean plasma cholesterol level than those with the X1X1 genotype and E2 phenotype (5.24 versus 3.43 mmol/L; P < .05).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Louhija
- Second Department of Medicine, University of Helsinki, Finland
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Naples D, Akchurin N, Birmingham P, Breuer H, Chang CC, Cihangir S, Corcoran MD, Davis WL, Gustafson HR, Holmgren H, Kasper P, Lincoln D, Longo MJ, Marraffino J, McPherson J, Miettinen HE, Morrow G, Mutchler GS, Onel Y, Thomas GP, Traynor MM, Waters JW, Webster MS, Xu JP, Zhu Q. A dependence of photoproduced dijets. Phys Rev Lett 1994; 72:2341-2344. [PMID: 10055855 DOI: 10.1103/physrevlett.72.2341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Adams D, Ahmad S, Akchurin N, Birmingham P, Breuer H, Chang CC, Cihangir S, Corcoran MD, Davis WL, Gustafson HR, Holmgren H, Kasper P, Kruk J, Lincoln D, Longo MJ, Marraffino J, McPherson J, Miettinen HE, Morrow G, Mutchler GS, Naples D, Onel Y, Skeens J, Thomas GP, Traynor MM, Waters JW, Webster MS, Xu JP, Zhu Q. Observation of jet production by real photons. Phys Rev Lett 1994; 72:2337-2340. [PMID: 10055854 DOI: 10.1103/physrevlett.72.2337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Krishna NM, Kruk JW, Miettinen HE, Moss RM, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, Birman A, Chung SU, Etkin A, Fernow RC, Kirk H, Protopopescu SD, Willutzki H, Hallman T, Madansky L, Bar-Yam Z, Dowd J, Kern W, King E, Mayes BW, Pinsky LS. Analyzing power of inclusive production of pi +, pi -, and KS0 by polarized protons at 13.3 and 18.5 GeV/c. Phys Rev D Part Fields 1990; 41:13-16. [PMID: 10012181 DOI: 10.1103/physrevd.41.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Krishna NM, Kruk JW, Lincoln DW, Miettinen HE, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, White JL, Chung SU, Etkin A, Fernow RC, Protopopescu SD, Willutzki H, Hallman T, Madansky L, Pinsky LS. Spin-parameter measurements in inclusive Sigma 0 production. Phys Rev Lett 1989; 62:1591-1594. [PMID: 10039714 DOI: 10.1103/physrevlett.62.1591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bonner BE, Buchanan JA, Carey DC, Clement JM, Coleman RN, Corcoran MD, Cossairt JD, Derevshchikov AA, Grosnick DP, Hill DA, Imai K, Lehar F, Lopiano D, Luehring FC, Kruk JW, Kuroda K, Maki T, Makino S, Masaike A, Matulenko YA, Meshchanin AP, Michalowicz A, Miettinen HE, Miller DH, Miyake K, Mohammadzadeh AH, Mutchler GS, Nagamine T, Nessi-Tedaldi F, Nessi M, Nurushev SB, Nguyen C, Ohashi Y, Pauletta G, Penzo A, Phillips GC, Read AL, Roberts JB, Salvato G, Schiavon P, Shima T, Solovyanov VL, Spinka HM, Stanek RW, Stevenson PM, Takashima R, Takeuchi F, Underwood DG, Vasiliev AN, Villari A, White JL, Yokosawa A, Yoshida T, Zanetti A, Zhu Q. Analyzing-power measurement in inclusive pi 0 production at high xF. Phys Rev Lett 1988; 61:1918-1921. [PMID: 10038932 DOI: 10.1103/physrevlett.61.1918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Kruk JW, Miettinen HE, Moss RM, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, Birman A, Chung SU, Fernow RC, Kirk H, Protopopescu SD, Hallman T, Madansky L, Mayes BW, Pinsky LS, Bar-Yam Z, Dowd J, Kern W, King E. Spin-parameter measurements in Lambda and KS production. Int J Clin Exp Med 1988; 38:729-741. [PMID: 9959202 DOI: 10.1103/physrevd.38.729] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wicklund AB, Arenton MW, Ayres DS, Diebold R, May EN, Nodulman LJ, Sauer JR, Swallow EC, Calkin MM, Corcoran MD, Hoftiezer J, Miettinen HE, Mutchler GS. Study of the reaction p. Phys Rev D Part Fields 1987; 35:2670-2717. [PMID: 9957980 DOI: 10.1103/physrevd.35.2670] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Kruk JW, Miettinen HE, Moss RM, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, Birman A, Chung SU, Fernow RC, Kirk H, Protopopescu SD, Hallman T, Madansky L, Mayes BW, Pinsky LS, Bar-Yam Z, Dowd J, Kern W, King E. Spin transfer in hyperon production. Phys Rev Lett 1987; 58:447-450. [PMID: 10034941 DOI: 10.1103/physrevlett.58.447] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Naudet C, Corcoran M, Johns K, Miettinen HE, Rice J, Roberts JB, Arenton MW, Ditzler WR, Fields TH, Harrison M, Kanofsky A, Gustafson R, Cormell L, Dris M, Fleischman J, Gardella E, Kononenko W, Robinson B, Selove W, Theodosiou G, Yost B, Chen HF, Erwin AR, Hasan MA, Kuehn CE, Nelson KS, Thompson MA. Evidence for higher-twist effects in hard pi p collisions at 200 GeV/c. Phys Rev Lett 1986; 56:808-811. [PMID: 10033291 DOI: 10.1103/physrevlett.56.808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Arenton MW, Chen HF, Corcoran M, Cormell L, Ditzler WR, Dris M, Erwin AR, Fields T, Fleischman J, Gardella E, Gustafson R, Harrison M, Hasan MA, Hitzman C, Johns K, Kanofsky A, Kononenko W, Kuehn CE, Miettinen HE, Naudet C, Nelson KS, Rice J, Roberts J, Robinson B, Selove W, Theodosiou G, Thompson MA, Yost B. Measurement of the dijet cross section in 400-GeV/c pp interactions. Phys Rev D Part Fields 1985; 31:984-995. [PMID: 9955788 DOI: 10.1103/physrevd.31.984] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Madigan WP, Bell DA, Buchanan JA, Calkin MM, Clement JM, Copel M, Corcoran MD, Johns KA, Lesikar JD, Miettinen HE, Mutchler GS, Naudet CJ, Pepin GP, Phillips GC, Roberts JB, Turpin SE, Hungerford EV, Mayes BW, Hancock AD, Pinsky LS, Sekharan KK, Hollas CL, Riley PJ, Allred JC, Bonner BE, Cameron P, Linn ST, Furic M, Valkovic V. Transverse-spin dependence of the p-p total cross section Delta sigma T from 0.8 to 2.5 GeV/c. Phys Rev D Part Fields 1985; 31:966-975. [PMID: 9955786 DOI: 10.1103/physrevd.31.966] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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