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PMID |
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1 |
2678583
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Type 2 diabetic patients are known to frequently have a high insulin level and were recently described as having high plasminogen activator inhibitor (PAI) activity, compared to normal controls.
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2 |
2678583
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As we have shown in several clinical conditions (normal subjects, obese patients, angina pectoris patients) that plasma PAI activity was linked with plasma insulin, we have studied in 38 type 2 diabetic patients the relationship between PAI activity, insulin and other parameters.
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3 |
2678583
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A significant correlation was found between PAI activity and insulin (r = 0.60, p less than 0.001), body mass index (r = 0.32, p less than 0.05) and Apolipoprotein B (r = 0.33, p less than 0.05).
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4 |
1719559
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We hypothesized that insulin and insulin-like growth factor type I (IGF-I) can influence synthesis of PAI-1, thereby potentially attenuating fibrinolysis.
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5 |
1719559
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Accumulation of PAI-1 protein in conditioned medium over 24 hr was stimulated more with insulin alone than with the combination.
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6 |
1612205
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Because increased concentrations of plasminogen activator inhibitor type-1 (PAI-1) occur also, we hypothesized that proinsulin and split proinsulin may augment endothelial cell PAI-1 expression, thereby potentially attenuating endogenous fibrinolysis and accelerating atherosclerosis.
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7 |
1612205
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Proinsulin increased PAI-1 activity in conditioned media of endothelial cells as did split proinsulin, paralleled by increased expression of PAI-1 mRNA.
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8 |
1612205
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The proinsulin stimulation of PAI-1 expression was not attenuated by either anti-insulin receptor antibodies or a 100-fold excess of insulin.
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9 |
1612205
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These results indicate that proinsulin augments PAI-1 expression, potentially contributing to vasculopathy in patients with non-insulin-dependent diabetes mellitus.
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10 |
1459169
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In spite of the reduction of the triglyceride concentrations and unchanged insulin levels, there was a significant increase of the activity of PAI-1 (+21%, P < 0.01) after MaxEPA suggesting a possible impairment of the fibrinolytic capacity.
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11 |
8420806
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Concordant increases of plasma PAI-1 and plasma IRI appear to reflect direct effects of insulin and proinsulin on the synthesis and secretion of PAI-1 by endothelial and liver cells as judged from results of studies in vitro.
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12 |
8475477
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Plasminogen activator inhibitor-1 (PAI) activity, plasma insulin, glucose, cholesterol and triglyceride (TG) concentrations were determined in 32 Chinese diabetic patients (mean age 61.4 yr) and 41 healthy controls (mean age 64.5 yr) to establish the relationships between these parameters.
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13 |
8475477
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Insulin, glucose, cholesterol and triglyceride levels were significantly higher in the diabetics, whereas no significant difference of PAI activity was noted between groups.
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14 |
8475477
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PAI activity was not affected by the increase of plasma insulin, cholesterol, TG or glucose.
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15 |
8261243
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To determine whether the increased PAI-1, known to be associated with accelerated coronary artery disease in non-diabetic subjects, is a consequence of direct effects of insulin on endothelial cells, we performed the present study with primary cultures of human aortic endothelial cells.
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16 |
8261243
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Insulin at pharmacologic concentrations did not alter either PAI-1 or t-PA production by the human aortic endothelial cells, although insulin stimulated PAI-1 synthesis in human hepatoma (Hep G2) cells as expected.
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17 |
8304913
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Although compensatory hyperinsulinaemia may prevent the development of NIDDM in insulin-resistant individuals, there is substantial evidence that insulin resistance and/or hyperinsulinaemia is associated with higher plasma concentrations of triglyceride, uric acid and plasminogen activator inhibitor 1 and with lower HDL cholesterol concentrations.
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18 |
8281664
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We and others have hypothesized that the increased PAI-1 may contribute to acceleration of atherosclerosis in this condition and in other states characterized by insulin resistance as well.
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19 |
8281664
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To assess this possibility directly, this study was performed to identify potential direct effects of proinsulin and proinsulin split products on synthesis of PAI-1 in liver cells, thought to be the major source of circulating PAI-1 in vivo.
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20 |
8281664
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Our results are consistent with the hypothesis that precursors of insulin (proinsulin and proinsulin split products), known to be present in relatively high concentrations in plasma in patients with NIDDM and conditions characterized by insulin resistance, may directly stimulate PAI-1 synthesis, thereby attenuating fibrinolysis and accelerating atherogenesis.
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21 |
8120522
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Tissue plasminogen activator antigen measured after venous occlusion showed a significant reduction whilst plasminogen activator inhibitor 1 activity was 26.0 +/- 9.8 IU ml-1 on oral treatment and 18.2 +/- 4.7 IU ml-1 on insulin treatment (NS).
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22 |
7828304
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To define the possible presence of such an axis, this study was designed to determine whether insulin, its precursors, or both increase the concentrations of PAI-1 in rabbits in vivo.
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23 |
7828304
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Plasma PAI-1 activity increased 3.8-fold with proinsulin (P = .002) and 3.6-fold with insulin (P = .002).
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24 |
7828304
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As judged from changes in mRNA in tissues, proinsulin and insulin increased PAI-1 gene expression within 3 hours by 2.1- and 2.1-fold, respectively, in aorta (P = .025 each) and by 1.9- and 2.4-fold in liver (P = .015 and P = .001), with return of values to baseline within 24 hours (n = 4 experiments in each case).
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25 |
7608643
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Whilst these correlations may represent cause and effect for plasminogen activator inhibitor, there is no evidence that changes in levels of proinsulin-like molecules influence levels of other risk factors.
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26 |
7792741
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In univariate analysis, PAI-1 activity correlated with serum triglycerides (rs = 0.43; p < 0.0001), insulin sensitivity (rs = -0.30; p = 0.004), and immunoreactive insulin (rs = 0.45; p < 0.0001).
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27 |
7792741
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However, the relationship between PAI-1 activity and plasma specific insulin (IEMA) was weaker (rs = 0.24; p = 0.019) than those with intact proinsulin (rs = 0.53; p < 0.0001) and des-31,32-proinsulin (rs = 0.54; p < 0.0001) despite the low concentrations of these proinsulin-like molecules.
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28 |
7792741
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In multiple regression analysis, only des-31,32-proinsulin (p = 0.001) and serum triglycerides (p = 0.013) were significant determinants of PAI-1 activity.
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29 |
8692017
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In the present study, we examined if proinsulin and insulin affect the constitutive (fasting) secretion of plasminogen activator inhibitor type 1 (PAI-1) and tissue plasminogen activator (t-PA) in young healthy women (N = 17).
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30 |
8692017
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We also measured the antigen concentrations of PAI-1 and t-PA during slow and fast changes in proinsulin and insulin levels induced by oral (OGTT) and intravenous (IVGTT) glucose tolerance tests.
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31 |
8692017
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Our findings suggest that proinsulin and insulin have no influence on the regulation of plasma levels of PAI-1 and t-PA in young healthy women, irrespective of intake of contraceptive steroids.
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32 |
8692017
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The clinical researchers also studied the antigen concentrations of PAI-1 and t-PA during slow and fast changes in proinsulin and insulin levels induced by oral and intravenous glucose tolerance tests.
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33 |
8692017
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These findings suggest that neither proinsulin nor insulin regulate plasma levels of PAI-1 and t-PA in young healthy women regardless of OC use status.
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34 |
8911991
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Sulfonylureas, in contrast to insulin, seem able to inhibit the fibrinolytic system, possibly via the stimulating effect of proinsulin on the endothelial PAI-1 expression.
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35 |
9519730
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Hypofibrinolysis caused by increased plasminogen activator inhibitor 1 (PAI-1) has been implicated in the vasculopathy of type 2 diabetes, typified by increased insulin, glucose, and triglycerides.
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36 |
9519730
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However, short-term infusions of insulin have not increased PAI-1 in normal subjects.
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37 |
9519730
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We hypothesized that induction of increased insulin accompanied by increased glucose and triglycerides would increase PAI-1.
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38 |
9519730
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In contrast to results with infusion of saline alone (n = 16) and euglycemic-hyperinsulinemic clamps (n = 10, serum insulin = 89 +/- 7 microU/dl), PAI-1 in blood increased significantly 6 h after the onset of infusion (15 +/- 5 ng/ml, P < 0.05 vs. baseline = 7.4 +/- 1.1, saline 6 h = 3.4 +/- 1.1, and insulin alone 6 h = 3.7 +/- 0.8) and remained elevated for an additional 6 h (combined infusion = 13.8 +/- 3.8 ng/ml, saline = 6.7 +/- 2 ng/ml, insulin alone = 7.8 +/- 1.7 ng/ml, P = 0.06).
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39 |
11423472
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Among the factors responsible for the increases of PAI-1, insulin has recently attracted attention.
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40 |
11919188
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These data suggested that a member of the Forkhead/winged helix family of transcription factors mediated the effect of insulin on PAI-1 transcription.
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41 |
12940867
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The aim of this study was to investigate the effect of insulin and an insulin-sensitizing agent, rosiglitazone (RSG), on the production of plasminogen-activator inhibitor-1 (PAI-1) in isolated subcutaneous abdominal adipocytes.
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42 |
12940867
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In contrast, insulin + RSG (10-8 m) reduced PAI-1 production relative to insulin alone (***p < 0.001), whilst RSG alone reduced PAI-1 protein secretion in a concentration-dependent manner (RSG at 10-10 m: 50.4 +/- 2.87 ng/ml downward arrow ***; RSG at 10-5 m: 30.3 +/- 2.0 ng/ml downward arrow ***; p < 0.001).
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43 |
12940867
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Insulin stimulated PAI-1 secretion, whilst RSG reduced both PAI-1 secretion alone and in combination with insulin.
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44 |
14515181
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Moreover, insulin, as we have previously shown, directly stimulates PAI-1 production with a mechanism underlying a complex signaling network which ultimately leads to ERK activation.
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45 |
14515181
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In conclusion, Wy-14,643 induces PAI-1 gene expression, in the presence or absence of insulin, with a mechanism which is independent on PPARalpha activation and requires signaling through the ERK1/2 signaling pathway.
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46 |
14550286
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Adipokines such as Plasminogen activator inhibitor-1 (PAI-1), interleukin (IL)-8, and tumor necrosis factor (TNF)-alpha are elevated in patients with obesity, insulin resistance, and type 2 diabetes.
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47 |
15069077
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We previously identified an insulin response element in the promoter of plasminogen activator inhibitor 1 (PAI-1) that was activated by an unidentified member of the forkhead/winged helix (Fox) family of transcription factors.
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48 |
15780823
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Therefore, direct inhibition of PAI-1 might not only provide a new therapeutic strategy for reducing cardiovascular risk, but may also have beneficial effects on obesity and insulin resistance.
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49 |
15953128
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PAI-1 activity, fibrinogen, postload insulin and -proinsulin were significantly higher and tPA activity significantly lower in MI patients in the univariate analysis.
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50 |
16093575
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Troglitazone improved insulin sensitivity (mean increase in whole body glucose uptake 23.1 +/- 10.5% (p = 0.047)) and normalised plasma concentrations of hsCRP, tPA and TNF-alpha, whereas it did not significantly change IL-6, leptin and PAI-1.
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51 |
16427606
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Low plasma levels of adiponectin (hypoadiponectinemia) and elevated circulating concentrations of plasminogen activator inhibitor (PAI)-1 are causally associated with obesity-related insulin resistance and cardiovascular disease.
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52 |
16634839
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PAI-1 inversely correlated with the insulin sensitivity index (SI) but only in women with IIS (P<0.0001).
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53 |
17230448
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Depletion of E2F1-3 was sufficient for inducers such as insulin to potently induce PAI-1 gene expression in pre-adipocytes.
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54 |
18566293
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Using a hyperinsulinemic clamp in young rats, we show that experimental activation of HBP, through the systemic infusion of glucosamine, induced severe insulin resistance (36% decline in peripheral insulin action; P<0.05), increased adipose tissue gene expression of fat-derived peptides (PAI-1 by 4-fold, angiotensinogen 3-fold, leptin 2-fold, resistin 4-fold, and adiponectin 4-fold; P<0.01 compared with young saline-infused), and enhanced glycosylation of transcription factors, thus mimicking a physiological and biological phenotype of aging.
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55 |
19132222
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Especially a defective insulin response in the liver contributes to the development of hyperglycemia, dyslipidemia and peripheral insulin resistance and may contribute to hepatic over-expression of PAI-1 in diabetes type 2.
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56 |
19776253
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To link insulin resistance, aging, and cardiovascular disease, we examined the expression and glycosylation pattern of PAI-1 in liver and white adipose tissue (WAT) from adult (3 mo) and insulin-resistant old (24 mo) Wistar rats.
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57 |
19940327
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Adipose tissue produces multiple cytokines(TNF-alpha, IL-6, PAI-1, CRP, angiotensinogen, leptin, adiponectin, visfatin, apelin, resistin)which decrease insulin sensitivity and induce inflammatory processes, endothelial dysfunction,and atherosclerosis.
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58 |
19875998
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BMI and waist circumference, in separate models, explained significant variation in metabolic (insulin, lipids, blood pressure (BP)) and inflammatory/procoagulation (C-reactive protein, PAI-1 activity and antigen, and fibrinogen) risk factors.
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59 |
18370641
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Insulin resistance (IR), the underlying cause of type 2 diabetes mellitus (DM), is also associated with elevated levels of inflammatory factors, such as C reactive protein (CRP), plasminogen activator inhibitor-1 (PAI-1), and fibrinogen.
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60 |
21298325
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It was found that insulin significantly reduced IL-6-induced gene transcription of serum amyloid 1 (SAA1), serum amyloid 2 (SAA2), haptoglobin, orosomucoid, and plasmin activator inhibitor-1 (PAI-1).
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61 |
9267149
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The activities and levels of F-VII, F-X, and PAI-1 correlated with triglycerides in serum and also with fasting insulin levels in hyperlipidemic patients with atherosclerotic vascular disease.
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