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1 Plasminogen Activator Inhibitor-1 and Relations to Fatty Acid Composition in the Diet and in Serum Cholesterol Esters Liisa Byberg, Annika Smedman, Bengt Vessby, Hans Lithell Abstract High plasminogen activator inhibitor (PAI)-1 levels and poor dietary fat quality are potential risk factors for cardiovascular disease. The aim was to investigate the cross-sectional associations between PAI-1 activity and dietary nutrient intake, focusing on fat quality, in a population-based study of 871 men aged 70 years. The relationship between PAI-1 and the fatty acid composition in serum cholesterol esters (n 381 men) was also studied. The estimated total fat intake was positively associated with PAI-1 activity. The intake of both monounsaturated and polyunsaturated fatty acids was positively associated with PAI-1 activity, whereas the intake of saturated fatty acids was not. In serum cholesterol esters, higher proportions of palmitoleic and dihomo- -linolenic acid, a lower proportion of linoleic acid, and reduced estimated 5-desaturase activity were associated with higher PAI-1 levels. These associations were confounded by factors representing the insulin resistance syndrome. PAI-1 activity was positively associated with -linolenic and arachidonic acid, independent of potential confounders. In conclusion, this study demonstrates that dietary intake of unsaturated fatty acids is positively associated with PAI-1 activity, whereas intake of saturated fatty acids is not. The associations present between PAI-1 activity and the fatty acid proportions in serum cholesterol esters are partly influenced by metabolic syndrome related factors. (Arterioscler Thromb Vasc Biol. 2001;21: ) Key Words: plasminogen activator inhibitor-1 fatty acid composition diet serum cholesterol esters population-based study Ischemic heart disease and cerebrovascular disease are the 2 leading causes of death in the industrialized world. 1 The role of dietary fat quality in cardiovascular disease is under due investigation. It has been suggested that unsaturated fatty acids reduce the risk of cardiovascular disease, whereas saturated fatty acids seem to be deleterious. 2 Also, the role of coagulation and fibrinolytic factors in cardiovascular disease is discussed. In many conditions involving an increased risk of cardiovascular disease, such as type II diabetes and glucose intolerance, there is a tendency to hypercoagulation, hypofibrinolysis, or a combination of both. A high level of plasminogen activator inhibitor (PAI)-1, the main regulator of the fibrinolytic system, has been suggested as one of the important factors involved in the genesis of atherothrombosis in conditions involving a high risk of cardiovascular disease. 3 The regulation of PAI-1 levels includes genetic and environmental factors. 3 Possible important environmental factors that vary along with PAI-1 are as follows: central obesity; concentrations of plasma insulin, proinsulin, and triglyceriderich lipoprotein particles; and dietary habits. Observational studies have demonstrated inverse associations between PAI-1 levels and the intake of carbohydrates 4 and of fibers. 4,5 The intake of fat 4 and alcohol consumption 6,7 were positively associated with PAI-1. Studies investigating the effect of fish intake or supplementation with long-chain 3 fatty acids, which are naturally present in fatty fish, suggest that PAI-1 levels are increased by such supplementation, 8,9 although other studies could not demonstrate such an effect (see summary 10 ). The increased PAI-1 levels observed after 3 supplementation are paradoxical, inasmuch as long-chain 3 fatty acids are generally believed to have a cardioprotective effect. Recently, in vitro experiments have shown that unsaturated fatty acids of different degrees of unsaturation increase the production of PAI-1, whereas saturated fatty acids do not. 13 To date, there is no study to support these results in vivo in humans. The aim of the present study was to investigate the cross-sectional association of the dietary intake of nutrients (with a focus on dietary fat intake and quality) with PAI-1 activity among 871 men aged 70 years participating in a population-based survey. We also wanted to investigate the association between PAI-1 activity and the fatty acid composition of serum cholesterol esters. Methods The Uppsala Longitudinal Study of Adult Men (ULSAM) has been described previously. 14 In brief, all men born from 1920 to 1924 and Received May 26, 2001; revision accepted August 25, From the Sections of Geriatrics (L.B., H.L.) and Clinical Nutrition Research (A.S., B.V.), Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden. Correspondence to Liisa Byberg, MD, Section of Geriatrics, Department of Public Health and Caring Sciences, PO Box 609, SE Uppsala, Sweden. liisa.byberg@pubcare.uu.se 2001 American Heart Association, Inc. Arterioscler Thromb Vasc Biol. is available at
2 Byberg et al PAI-1 Activity and Fatty Acid Composition 2087 TABLE / / / /16 0 Fatty Acids and Their Trivial Names Short-chain saturated fatty acids Lauric acid Myristic acid Pentadecanoic acid Palmitic acid Palmitoleic acid Heptadecanoic acid Stearic acid Oleic acid Linoleic acid -Linolenic acid -Linolenic acid Arachidic acid Dihomo- -linolenic acid Arachidonic acid Eicosapentaenoic acid Docosapentaenoic acid Docosahexaenoic acid 5-Desaturase activity (estimated) 6-Desaturase activity (estimated) 9-Desaturase activity (estimated) Elongase activity (estimated) living in Uppsala in 1970 were invited to a health investigation in which 2322 participated (of the 2841 men invited). The men still alive and still living in the Uppsala region in 1991 (n 1681) were invited for a reexamination, in which 1221 men participated. The study was approved by the local ethics committee, and all men gave their informed consent. The physical and metabolic examinations of the men at age 70 have been described in detail previously. 14 Examinations included anthropometry (height, weight, and waist and hip circumferences), blood pressure, serum lipids (total, LDL and HDL cholesterol, and triglycerides), an oral glucose tolerance test for diagnosis of diabetes, 15 and a hyperinsulinemic euglycemic clamp test for determination of the insulin sensitivity index. The investigations took place in the morning after an overnight fast. A medical questionnaire was used to obtain information on current use of medicines and on the level of physical activity. Information on smoking was obtained by interview. Marital status and educational level was retrieved from the Swedish census registry. PAI-1 activity was analyzed in platelet-poor plasma from 914 of the 1221 men by use of an indirect enzymatic assay (Spectrolyse/pL PAI-1, Biopool AB). Blood samples were drawn in 5-mL evacuated tubes (Vacutainer, Becton Dickinson), which had been prefilled with 0.5 ml buffered mol/l sodium citrate (ph 5.8), with the subject at rest in the supine position with minimal venous stasis. The tubes were put on ice until centrifugation at 4 C at 2000g for 10 minutes. The plasma was stored at 70 C until analysis. An optically readable, precoded, 7-day food record was completed by 1138 of the 1221 men for assessment of habitual dietary intake. The design and validity of the food record used has been discussed previously. 16 The fatty acid composition in serum cholesterol esters was analyzed by using gas-liquid chromatography 17 in a random subsample of 611 men. The fatty acids are presented as the proportion of the sum of the fatty acids analyzed. The activities of certain enzymes involved in fatty acid biosynthesis were estimated as the product/precursor ratios of the proportions of individual fatty acids: TABLE 2. Clinical Characteristics of the Study Population (n 871) Mean SD Range Age, y Weight, kg BMI, kg/m Waist/hip ratio Systolic blood pressure, mm Hg Diastolic blood pressure, mm Hg Total serum cholesterol, mmol/l Serum triglycerides, mmol/l M/I, mg min 1 kg 1 /(100 mu/l) PAI-1 activity, U/mL Smoking, % 19.7 Antihypertensive treatment, % 33.1 Lipid-lowering treatment, % 9.1 Type II diabetes, % 15.6 Impaired glucose tolerance, % 24.3 M/I indicates insulin sensitivity index. 5 desaturase 20:4 6/20:3 6; 6 desaturase 18:3 6/18:2 6; 9 desaturase 18:1 9/18:0; and elongase 18:0/16:0. In a subgroup of these men (n 102), the gas chromatograms were reanalyzed and recalculated to include the proportions of 15:0 and 17:0, fatty acids normally not analyzed because of the small amounts present. In this subgroup, the fatty acid composition of the serum phospholipids was also analyzed. (For a list of fatty acids and their trivial names, please refer to Table 1.) The study population in the present analysis constituted those men having completed the 7-day dietary record and having PAI-1 activity analyzed (871 men in all). The clinical characteristics of the study population are presented in Table 2. The relationships of proportions of fatty acids in cholesterol esters with PAI-1 were investigated in the subgroup without missing values for these components (n 381 men). The same procedure was repeated in the subgroup including the proportions of 15:0 and 17:0 in serum cholesterol esters and in serum phospholipids (n 96 men). The subgroup of 381 men were older (71.1 versus 70.6 years, P 0.001) and had higher blood pressure (systolic 149 versus 145 mm Hg, P 0.001; diastolic 85 versus 82 mm Hg, P 0.001) than the rest of the men in the study population. The subgroup of 96 men did not significantly differ from the rest of the men in the study population. Statistical analyses were performed with Stata statistical software (Stata Corp). Skewed variables were transformed to reach normality before they were analyzed. The dietary intake of nutrients was divided by the total energy intake before analysis (grams per day per megajoules), although the crude intake (grams per day) is presented in the tables as arithmetic mean SD. The associations of variables with PAI-1 were investigated with pairwise or partial correlation analyses. The associations were adjusted for potential confounders suggested to influence the dietary habits, PAI-1 activity, or both. Confounders that were adjusted for were age, use of lipid-lowering or anti-hypertensive medicines, smoking, educational level, marital status, and physical activity. The associations were also adjusted for body mass index (BMI), waist/hip ratio, insulin sensitivity index, and serum triglyceride concentrations, which are components of the insulin resistance syndrome, and have been shown to be independently associated with PAI-1 activity. 14 A value of P 0.05 was regarded as statistically significant. Results The reported total energy intake per day was MJ (mean SD) and ranged between 2.3 and 19.4 MJ. To avoid confounding by extreme underreporting of the dietary intake,
3 2088 Arterioscler Thromb Vasc Biol. December 2001 TABLE 3. Estimated Dietary Intake of Nutrients and Their Association With PAI-1 Activity Mean SD Range E% r P Energy intake, MJ/d Dietary intake, g/d Carbohydrates Protein Fat Saturated fatty acids Monounsaturated fatty acids Polyunsaturated fatty acids Cholesterol Fiber Alcohol E% indicates percentage of energy (mean value presented); r, pairwise correlation coefficient. Energy-adjusted nutrients were used in the analyses: (g/d) MJ. There were 871 men studied, except for alcohol values (n 723) and cholesterol values (n 837). the analyses were also performed when men with a reported energy intake 4.5 MJ were excluded (n 46). This exclusion did not change any of the results presented below. The total energy intake was inversely associated with PAI-1 activity (Table 3). Intake of Macronutrients The reported intake of macronutrients, presented as grams per day, and the associations with PAI-1 activity are shown in Table 3. Carbohydrate intake and fiber intake were inversely associated with the activity of PAI-1. The intakes of protein and of alcohol were positively associated with PAI-1, as were the intakes of total dietary fat and of cholesterol. When the fat intake was divided into the intake of saturated, monounsaturated, and polyunsaturated fatty acids, there was no correlation between the intake of saturated fatty acids and PAI-1, whereas the intake of monounsaturated and also of polyunsaturated fatty acids was positively associated with PAI-1 activity. Adjustment for potential confounders and metabolic variables (as described in Methods) did not alter the observed relationships, except for the association between fiber intake and PAI-1, which turned nonsignificant after adjustment for educational level or the level of physical activity. Dietary Fatty Acids The reported intake of specific fatty acids and their associations with PAI-1 activity are presented in Table 4 as grams per day. PAI-1 activity was not associated with the dietary intake of any of the saturated fatty acids. The estimated TABLE 4. Estimated Intake of Dietary Fatty Acids and Their Association With PAI-1 Activity Estimated Fatty Acid Intake, g/d Fatty Acids Mean SD Range r P Energy-adjusted fatty acids were used in analyses (g/d) MJ. There were 871 men studied, except for values (n 846), and values (n 870).
4 Byberg et al PAI-1 Activity and Fatty Acid Composition 2089 TABLE 5. Fatty Acid Composition of Serum Cholesterol Esters and Association With PAI-1 Activity Fatty Acid Composition, % Fatty Acids Men, n Mean SD Range r P / / / / Fatty acids are presented in relative amounts (percentage of total fatty acids analyzed). intakes of the monounsaturated fatty acids (palmitoleic acid [16:1 7] and oleic acid [18:1 9]) were positively associated with PAI-1 activity. The intakes of the polyunsaturated 6 fatty acids (linoleic acid [18:2 6] and arachidonic acid [20:4 6]) and the 3 fatty acids ( -linolenic acid [18:3 3] and docosapentaenoic acid [22:5 3]) were also positively associated with PAI-1 activity. PAI-1 activity was not associated with the intake of eicosapentaenoic acid (20:5 3) or docosahexaenoic acid (22:6 3); there was borderline significance. All associations were independent of the potential confounders and metabolic variables mentioned in Methods. Fatty Acid Composition in Serum Cholesterol Esters The fatty acid composition of the cholesterol esters in serum is presented in Table 5 as the percentage of the total amount of fatty acids analyzed. Some of the associations present between PAI-1 and the proportions of the cholesterol ester fatty acids (Table 5) are similar to (although in the opposite direction from) those present between the fatty acid composition and insulin sensitivity. 18 Thus, the relative amounts of palmitic acid (16:0), palmitoleic acid (16:1 7), and dihomo- -linolenic acid (20:3 6) were positively associated with PAI-1 activity (16:0, borderline significance), and the relative amount of linoleic acid (18:2 6) was inversely associated with PAI-1, as was the estimated 5-desaturase activity. These associations were no longer significant when adjustments were made for BMI, waist/hip ratio, the insulin sensitivity index, and serum triglyceride levels. There were also positive associations between PAI-1 and -linolenic acid (18:3 6), arachidonic acid (20:4 6), and 6-desaturase activity. The 3 fatty acids eicosapentaenoic acid (20:5 3) and docosahexaenoic acid (22:6 3) were not significantly associated with PAI-1 levels, which was also true for the relative amounts of stearic acid (18:0), oleic acid (18:1 9), and -linolenic acid (18:3 3). The association between PAI-1 and arachidonic acid turned nonsignificant when adjustments were made for the metabolic variables mentioned above, whereas the relationships with eicosapentaenoic acid (20:5 3) and docosahexaenoic acid (22:6 3) became of significance (r 0.11, P 0.032) and of borderline significance (r 0.09, P 0.090), respectively. The strength of the positive association between PAI-1 and 6-desaturase activity was reduced after adjustment for metabolic confounders, but the association was still statistically significant. Adjustment for the other potential confounders did not change the associations observed. Pentadecanoic and Heptadecanoic Acid in Serum Cholesterol Esters and Phospholipids The proportion of pentadecanoic acid (15:0) in serum cholesterol esters, analyzed in a subgroup of 96 men, was inversely associated with PAI-1 activity (r 0.20, P 0.050). The proportion of heptadecanoic acid (17:0) and the sum of the proportions of 15:0 and 17:0 in serum cholesterol esters were not significantly associated with PAI-1 activity (r 0.08, P and r 0.15, P 0.245, respectively; n 64). The detectable proportions of pentadecanoic and heptadecanoic acid in serum lipids are very low (for 15:0 and 17:0 in serum cholesterol esters: mean SD [range 0.10 to 0.32] and mean SD [range 0.07 to 0.18], respectively). In fact, the proportion of heptadecanoic acid in serum cholesterol esters could be determined in only 64 of the 96 analyses. The proportion of heptadecanoic acid was higher in serum phospholipids than in the cholesterol esters ( and 0.20 to 0.87, respectively; n 96), and there was also an inverse relationship with PAI-1 activity that was of borderline significance (r 0.19, P 0.064). The proportion of pentadecanoic acid in serum phospholipids was similar to that in the cholesterol esters, and
5 2090 Arterioscler Thromb Vasc Biol. December 2001 the inverse association with PAI-1 was also of borderline significance (r 0.18, P 0.076; n 95). The sum of 15:0 and 17:0 in the serum phospholipids was inversely associated with PAI-1 activity (r 0.21, P 0.041; n 95). The associations between the fatty acid composition in serum cholesterol esters (besides pentadecanoic and heptadecanoic acid) and PAI-1 activity were similar in this subgroup of 96 men and in the main group of 381 men (Table 5). Discussion In the present study, we demonstrate a clear positive association between the dietary intake of unsaturated fatty acids and the activity of PAI-1 when, at the same time, the intake of saturated fatty acids is unrelated to the PAI-1 levels. This pattern is present when the total amounts of saturated, monounsaturated, and polyunsaturated fatty acids and of separate fatty acids in the diet are studied. These results are contradictory in the sense that high PAI-1 levels are regarded as a risk factor for cardiovascular disease and that high intake of unsaturated fatty acids is believed to be protective. The mechanisms behind the cross-sectional associations in the present study may be the increased production of PAI-1 by unsaturated fatty acids but not by saturated fatty acids, 13 as observed in vitro. This is the first population study to cross-sectionally investigate the fatty acid composition in the diet and in serum cholesterol esters in relation to PAI-1. In a recent European multicenter study, 19 the concentration of PAI-1 antigen was not associated with the fatty acid composition of erythrocyte phospholipids, whereas there was an inverse association between tissue-type plasminogen activator (tpa) antigen concentrations and the proportion of total 3 fatty acids. 19 The tpa antigen concentration mainly reflects PAI-1 activity and not tpa activity (PAI-1 is the physiological inhibitor of tpa). The discrepant results between this multicenter study and the present study are probably mainly due to the different sites at which the fatty acid composition was analyzed, ie, erythrocyte phospholipids and serum cholesterol esters. The multicenter study also included a younger study population, and all presented relationships were adjusted for BMI, factors that could further contribute to the discrepant results. In intervention studies, supplementation with long-chain 3 fatty acids or increased fish intake has been observed to increase PAI-1 levels, in spite of a reducing effect on serum triglycerides. 8,9 However, some studies investigating the effect of 3 supplementation on PAI-1 levels could not find a difference between the 3-supplementation group and the control group (see summary 10 ). An 6 fatty acid is often used as a placebo in the control group to compensate for the increased fat intake in the 3 treatment group. The reason for the lack of difference between 3 and 6 treatment groups in some studies could be the increasing effect of not only 3 but also 6 unsaturated fatty acids on PAI-1 production seen in vitro The observations in the present study, in which dietary intake of unsaturated fatty acids is positively associated with PAI-1 activity, also support this idea. The few studies demonstrating a reduction of PAI-1 after 3 supplementation were methodologically questionable (there was lack of a control group and placebo, 20 and PAI-1 was measured in serum 21 ). It has been hypothesized that the increasing effect of 3 fatty acids on PAI-1 levels may be compensatory for the increased tendency to bleeding observed in Inuit populations naturally eating a diet rich in long-chain 3 fatty acids. 22 The risk of cardiovascular disease may not be increased with an increase in the PAI-1 levels, because unsaturated fatty acids are beneficial in other aspects. 2 On the nutrient level, there was a strong positive association between protein intake and PAI-1 activity. Others have demonstrated positive associations of the intake of fat 4 and alcohol 6,7 with PAI-1 and inverse associations of the intake of carbohydrates 4 and fibers 4,5 with PAI-1, associations also noted in the present study. However, fiber intake was not independent of physical activity or educational level in the present study. Explanations for the associations between PAI-1 and the intake of protein and between PAI-1 and the intake of carbohydrates remain to be discovered. However, these associations were not dependent of fat intake or the dietary fat quality. Intervention studies comparing diets rich in saturated fat versus polyunsaturated fat have demonstrated that the saturated fat rich diet gives the same serum cholesterol ester fatty acid pattern as that observed in insulin-resistant individuals. 18 This specific fatty acid pattern includes higher proportions of palmitic, palmitoleic, and dihomo- -linolenic acid, whereas the proportion of linoleic acid and the estimated 5-desaturase activity are lower. 18 In addition, the estimated 6-desaturase activity appears to be higher. 18 The same fatty acids that are changed after the saturated fat diet and in insulin-resistant individuals are related to high PAI-1 activity in the present study. However, these associations seem to be confounded by factors associated with the insulin resistance syndrome, namely, BMI, waist/hip ratio, serum triglyceride concentrations, and insulin sensitivity. We have previously demonstrated that these factors are independently related to PAI-1 activity in the present cohort. 14 The results suggest that the processes involved in the metabolism of dietary fatty acids included in the serum cholesterol esters somehow could be linked to the insulin-resistant state. It could also be that the dietary habits influence insulin resistance and the incorporation of fatty acids into serum cholesterol esters. The proportions of fatty acids present in the serum cholesterol esters were not associated with PAI-1 activity in the same manner as the fatty acids in the diet. There are several possible reasons for this. The fatty acid composition of serum cholesterol esters mirrors the dietary intake over the last couple of weeks. 23 However, some fatty acids, such as myristic, palmitic, stearic, palmitoleic, and oleic acids, can also be produced endogenously, whereas linoleic and -linolenic acids cannot be produced endogenously and must be ingested. 24 The fatty acid composition in a tissue also depends on other factors, including the activity of the different fatty acid desaturases, elongation, retroconversion, and oxidation systems, which all act on the fatty acids ingested. 24 Before ending up in the serum cholesterol esters, the fatty acids are also esterified, and the esterification process also affects the final composition of fatty acids. 24 Other determinants of the fatty acid composition in body tissues or body lipid structures
6 Byberg et al PAI-1 Activity and Fatty Acid Composition 2091 are degree of physical activity, genetic disposition, and (possibly) fetal malnutrition. 18 The method for measuring the fatty acid composition of the serum gives the proportion of a certain fatty acid in relation to the total amount of fatty acids analyzed. Thus, when the proportion of one fatty acid increases, the proportions of the others decrease, and vice versa. Data on the fatty acid composition of the diet are the estimated absolute amounts from the reported dietary intake and, thus, are not dependent on each other in the same manner. A specific fatty acid in serum cholesterol esters may originate from different foodstuffs in different types of diets. For example, in a Northern European diet, a large part of the proportion of oleic acid in serum cholesterol esters originates from the intake of foodstuffs rich in saturated fatty acids and, today, also from rapeseed oil. In a Mediterranean diet, the proportion of oleic acid largely originates from the intake of olive oil. Thus, the results concerning the relationships between the fatty acid composition in serum cholesterol esters and PAI-1 may not be applicable to all populations, but this remains to be studied. The proportions of pentadecanoic (15:0) and heptadecanoic (17:0) acid in serum and adipose tissue have been demonstrated to be specific markers of the intake of milk fat in the present cohort 16 and in other studies. 25,26 These fatty acids are mainly produced by ruminants. The inverse associations between PAI-1 activity and these markers of milk fat are in line with the inverse associations between milk fat intake and metabolic cardiovascular risk factors presented earlier. 16 The consumption of milk products has also been inversely associated with the levels of tpa antigen. 27 As mentioned above, the tpa antigen concentration mainly reflects PAI-1 activity; therefore, the results are in line with the present study. There were no significant associations between PAI-1 and the other saturated fatty acids analyzed in serum cholesterol esters (ie, palmitic acid and stearic acid). Thus, the proportions of pentadecanoic and heptadecanoic acid may more truly mirror the dietary intake of dairy products. Endogenous production, desaturation, and elongation may have influenced the proportions of palmitic and stearic acid, which are also to a large extent present in foodstuffs other than dairy products. Because the present study is observational, no conclusions regarding cause and effect can be made. However, the present study is unique in the sense that it is the largest populationbased study of elderly men presented that includes the estimation of fatty acid composition in the diet and measurements of the fatty acid composition in serum cholesterol esters. The nutrient intake and the fatty acid composition of the diet were estimated from dietary records. This comprehensive dietary record is a validated method 16 that is rarely used in large epidemiological studies. The relative nutrient intake has been observed to be similar in Swedish men and women, 28 although the energy intake is generally higher among men. Because the associations regarding dietary intake were adjusted for total energy intake in the present study, the results may also be applicable in women, although this remains to be established. In conclusion, the present study demonstrates that the dietary intake of unsaturated fatty acids is positively associated with PAI-1 activity, whereas the intake of saturated fatty acids is not. The associations present between PAI-1 activity and the fatty acid proportions in serum cholesterol esters are partly influenced by factors associated with the insulin resistance syndrome. Acknowledgments This work was supported by grants from the Ernfors Fund for Diabetes Research, the Foundation for Geriatric Research, Förenade Liv Mutual Group Life Insurance Co, the Medical Faculty at Uppsala University, the Swedish Council for Planning and Coordination of Research (No. A19-5/62), the Swedish Diabetes Association, the Swedish Medical Research Council (No. 5446), the Swedish National Association Against Heart and Lung Disease, and the Trygg Hansa Research Fund. References 1. The world health report: report of the director-general. 1999: making a difference. Geneva, Switzerland: World Health Organization; Ulbricht TLV, Southgate DAT. Coronary heart disease: seven dietary factors. Lancet. 1991;338: Kohler HP, Grant PJ. Plasminogen-activator inhibitor type 1 and coronary artery disease. N Engl J Med. 2000;342: Rankinen T, Rauramaa R, Väisänen S, Penttilä IM, Uusitupa M. Relation of habitual diet and cardiorespiratory fitness to blood coagulation and fibrinolytic factors. Thromb Haemost. 1994;71: Djoussé L, Ellison RC, Zhang Y, Arnett DK, Sholinsky P, Borecki I. Relation between dietary fiber consumption and fibrinogen and plasminogen activator inhibitor type 1: the National Heart, Lung, and Blood Institute Family Heart Study. Am J Clin Nutr. 1998;68: Margaglione M, Cappucci G, d Addedda M, Colaizzo D, Giuliani N, Vecchione G, Mascolo G, Grandone E, Di Minno G. PAI-1 plasma levels in a general population without clinical evidence of atherosclerosis: relation to environmental and genetic determinants. Arterioscler Thromb Vasc Biol. 1998;18: Scarabin P-Y, Aillaud M-F, Amouyel P, Evans A, Luc G, Ferrières J, Arveiler D, Juhan-Vague I. Associations of fibrinogen, factor VII and PAI-1 with baseline findings among 10,500 male participants in a prospective study of myocardial infarction: the Prime Study. Thromb Haemost. 1998;80: Emeis JJ, van Houwelingen AC, van den Hoogen CM, Hornstra G. A moderate fish intake increases plasminogen activator inhibitor type-1 in human volunteers. Blood. 1989;74: Boberg M, Pollare T, Siegbahn A, Vessby B. Supplementation with n-3 fatty acids reduces triglycerides but increases PAI-1 in non-insulindependent diabetes mellitus. Eur J Clin Invest. 1992;22: Hansen J-B, Grimsgaard S, Nordøy A,Bønaa KH. Dietary supplementation with highly purified eicosapentaenoic acid and docosahexaenoic acid does not influence PAI-1 activity. Thromb Res. 2000; 98: Karikó K, Rosenbaum H, Kuo A, Zurier RB, Barnathan ES. Stimulatory effect of unsaturated fatty acids on the level of plasminogen activator inhibitor-1 mrna in cultured human endothelial cells. FEBS Lett. 1995; 361: Banfi C, Risé P, Mussoni L, Galli C, Tremoli E. Linoleic acid enhances the secretion of plasminogen activator inhibitor type 1 by HepG2 cells. J Lipid Res. 1997;38: Nilsson L, Banfi C, Diczfalusy U, Tremoli E, Hamsten A, Eriksson P. Unsaturated fatty acids increase plasminogen activator inhibitor-1 expression in endothelial cells. Arterioscler Thromb Vasc Biol. 1998;18: Byberg L, Siegbahn A, Berglund L, McKeigue P, Reneland R, Lithell H. Plasminogen activator inhibitor-1 activity is independently related to both insulin sensitivity and serum triglycerides in 70-year-old men. Arterioscler Thromb Vasc Biol. 1998;18: Definition, diagnosis and classification of diabetes mellitus and its complications, I: diagnosis and classification of diabetes mellitus. Geneva, Switzerland: World Health Organization/Department of Noncommunicable Disease Surveillance; Report WHO/NCD/NCS/ Smedman AEM, Gustafsson I-B, Berglund LGT, Vessby BOH. Pentadecanoic acid in serum as a marker for intake of milk fat: relations between intake of milk fat and metabolic risk factors. Am J Clin Nutr. 1999;69:
7 2092 Arterioscler Thromb Vasc Biol. December Vessby B, Tengblad S, Lithell H. Insulin sensitivity is related to the fatty acid composition of serum lipids and skeletal muscle phospholipids in 70-year-old men. Diabetologia. 1994;37: Vessby B. Dietary fat and insulin action in humans. Br J Nutr. 2000; 83(suppl 1):S91 S Scarabin PY, Aillaud MF, Luc G, Lacroix B, Mennen L, Amouyel P, Evans A, Ferrières J, Arveiler D, Juhan-Vague I. Haemostasis in relation to dietary fat as estimated by erythrocyte fatty acid composition: the Prime Study. Thromb Res. 2001;102: Barcelli U, Glas-Greenwalt P, Pollak VE. Enhancing effect of dietary supplementation with -3 fatty acids on plasma fibrinolysis in normal subjects. Thromb Res. 1985;39: Mehta J, Lawson D, Saldeen T. Reduction in plasminogen activator inhibitor-1 (PAI-1) with omega-3 polyunsaturated fatty acid (PUFA) intake. Am Heart J. 1988;116: Marckmann P. Diet, blood coagulation and fibrinolysis. Dan Med Bull. 1995;42: Nikkari T, Luukkainen P, Pietinen P, Puska P. Fatty acid composition of serum lipid fractions in relation to gender and quality of dietary fat. Ann Med. 1995;27: Brenner RR. Factors influencing fatty acid chain elongation and desaturation. In: Vergroesen AJ, Crawford M, eds. The Role of Fats in Human Nutrition. London, England: Academic Press Ltd; 1989: Wolk A, Vessby B, Ljung H, Barrefors P. Evaluation of a biological marker of dairy fat intake. Am J Clin Nutr. 1998;68: Wolk A, Furuheim M, Vessby B. Fatty acid composition of adipose tissue and serum lipids are valid biological markers of dairy fat intake in men. J Nutr. 2001;131: Mennen LI, Balkau B, Vol S. Tissue-type plasminogen activator antigen and consumption of dairy products: the DESIR study: data from an Epidemiological Study on Insulin Resistance Syndromes. Thromb Res. 1999;94: Rothenberg E, Bosaeus I, Steen B. Intake of energy, nutrients and food items in an urban elderly population. Aging (Milano). 1993;5:
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