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Stathopoulou MG, Kanoni S, Papanikolaou G, Antonopoulou S, Nomikos T, Dedoussis G. Mineral Intake. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012; 108:201-36. [DOI: 10.1016/b978-0-12-398397-8.00009-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Verouti SN, Fragopoulou E, Karantonis HC, Dimitriou AA, Tselepis AD, Antonopoulou S, Nomikos T, Demopoulos CA. PAF effects on MCP-1 and IL-6 secretion in U-937 monocytes in comparison with OxLDL and IL-1β effects. Atherosclerosis 2011; 219:519-25. [DOI: 10.1016/j.atherosclerosis.2011.07.123] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 04/04/2011] [Accepted: 07/29/2011] [Indexed: 01/09/2023]
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Detopoulou P, Nomikos T, Fragopoulou E, Stamatakis G, Panagiotakos DB, Antonopoulou S. PAF and its metabolic enzymes in healthy volunteers: interrelations and correlations with basic characteristics. Prostaglandins Other Lipid Mediat 2011; 97:43-9. [PMID: 22079887 DOI: 10.1016/j.prostaglandins.2011.10.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 10/16/2011] [Accepted: 10/25/2011] [Indexed: 02/01/2023]
Abstract
PAF (1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine), a potent inflammatory mediator, is synthesized via the remodeling and the de novo route, key enzymes of which are acetyl-CoA:lyso-PAF acetyltransferase (lyso-PAF-AT) and DTT-insensitive CDP-choline:1-alkyl-2-acetyl-sn-glycerol cholinephosphotransferase (PAF-CPT), respectively. PAF-acetylhydrolase (PAF-AH) and its extracellular isoform lipoprotein-associated phospholipase-A(2) (Lp-PLA(2)) catabolize PAF. This study evaluated PAF levels together with leukocyte PAF-CPT, lyso-PAF-AT, PAF-AH and Lp-PLA(2) activities in 106 healthy volunteers. Men had lower PAF levels and higher activity of both catabolic enzymes and lyso-PAF-AT than women (P-values <0.05). Age was inversely correlated with PAF levels in men (r=-0.279, P=0.06) and lyso-PAF-AT in women (r=-0.280, P=0.05). In contrast, Lp-PLA(2) was positively correlated with age (r=0.201, P=0.04). Moreover, PAF-CPT was positively correlated with glucose (r=0.430, P=0.002) in women. In addition, Principal Component Analysis revealed three PAF metabolic patterns: (i) increased activities of PAF-CPT and PAF-AH, (ii) increased activities of PAF-CPT and lyso-PAF-AT and (iii) increased activity of Lp-PLA(2). The present study underlines the complexity of PAF's metabolism determinants.
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Tsoupras AB, Chini M, Mangafas N, Tsogas N, Stamatakis G, Tsantila N, Fragopoulou E, Antonopoulou S, Gargalianos P, Demopoulos CA, Lazanas MC. Platelet-Activating Factor and Its Basic Metabolic Enzymes in Blood of Naive HIV-Infected Patients. Angiology 2011; 63:343-52. [DOI: 10.1177/0003319711420608] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Letsiou S, Lu Y, Nomikos T, Antonopoulou S, Panagiotakos D, Pitsavos C, Stefanadis C, Pergantis SA. High-throughput quantification of selenium in individual serum proteins from a healthy human population using HPLC on-line with isotope dilution inductively coupled plasma-MS. Proteomics Clin Appl 2011. [DOI: 10.1002/prca.201190006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Letsiou S, Lu Y, Nomikos T, Antonopoulou S, Panagiotakos D, Pitsavos C, Stefanadis C, Pergantis SA. High-throughput quantification of selenium in individual serum proteins from a healthy human population using HPLC on-line with isotope dilution inductively coupled plasma-MS. Proteomics 2011; 10:3447-57. [PMID: 20827730 DOI: 10.1002/pmic.200900677] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this study, a method, based on dual column affinity chromatography hyphenated to isotope dilution inductively coupled plasma-quadrupole MS, was developed for selenium determination in selenoprotein P, glutathione peroxidase, and selenoalbumin in human serum samples from a group of healthy volunteers (n=399). Method improvement was achieved using methanol-enhanced isotope dilution which resulted in improved sensitivity and removal of isobaric interferences. Although no human serum reference materials are currently certified for their selenium species levels, method development was conducted using human serum reference material BCR 637 and 639 as their Se species content has been reported in the previous studies, and thus comparisons were possible. The mean selenium concentrations determined for the 399 healthy volunteer serum samples were 23 ± 10 ng Se mL(-1) for glutathione peroxidase, 49 ± 15 ng Se mL(-1) for selenoprotein P and 11 ± 4 ng Se mL(-1) for selenoalbumin. These values are found to be in close agreement with published values for a limited number of healthy volunteer samples, and to establish baseline Se levels in serum proteins for an apparently healthy group of individuals, thus allowing for subsequent comparisons with respective values determined for groups of individuals with selenium related health issues, as well as assist in the discovery of potential selenium biomarkers. Also, the relationship between Se serum protein levels and some anthropometric characteristics of the volunteer population were investigated. Additionally, further development of the analytical method used in this study was achieved by adding a size exclusion chromatography column after the two affinity columns via a switching valve. This allowed for the separation of small selenium-containing molecules from glutathione peroxidase and thus enhanced the overall confidence in its identification.
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Tsantila N, Karantonis HC, Perrea DN, Theocharis SE, Iliopoulos DG, Iatrou C, Antonopoulou S, Demopoulos CA. Atherosclerosis regression study in rabbits upon olive pomace polar lipid extract administration. Nutr Metab Cardiovasc Dis 2010; 20:740-747. [PMID: 19748252 DOI: 10.1016/j.numecd.2009.06.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Revised: 04/13/2009] [Accepted: 06/18/2009] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND AIMS Virgin olive oil polar lipid extract (OOPL) and olive pomace polar lipid extract (PPL) have similar antiatherosclerotic effects in cholesterol-fed rabbits. Our aim was to compare the effect of PPL with that of simvastatin on the progression of atherogenesis. METHODS AND RESULTS Rabbits were fed an atherogenic diet for 6 weeks in order to develop dyslipidemia and atheromatous lesions. Following documentation of these events in random animals (group A, n=6), the remaining were fed for 3 weeks with: standard chow alone (group B, n=6), chow supplemented with PPL (group C, n=6), and chow supplemented with simvastatin (group D, n=6). Blood was collected at 0, 6 and 9 weeks, to determine plasma lipid levels, plasma PAF-AH activity, platelet aggregation (PAF-EC(50)), resistance of plasma to oxidation (RPO) and extent of atheromatous lesions in aortas. The atherogenic diet induced dyslipidemia and increased PAF-AH activity. Dyslipidemia and PAF-activity reduced more effectively in groups C and D. RPO decreased in group B only. PAF-EC(50) values decreased in group C only. Atherogenesis progression in group C was prevented to an extent indistinguishable from that in group D. PAF-AH activity was positively correlated, whereas RPO was negatively correlated with the extent of atheromatous lesions. CONCLUSION PPL, as a dietary supplement, is equipotent to simvastatin in preventing the progression of atherogenesis.
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Tsantila N, Tsoupras AB, Fragopoulou E, Antonopoulou S, Iatrou C, Demopoulos CA. In Vitro and In Vivo Effects of Statins on Platelet-Activating Factor and Its Metabolism. Angiology 2010; 62:209-18. [DOI: 10.1177/0003319710375089] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Platelet activating factor (PAF) is implicated in cardiovascular disease (CVD). Statins are widely used in these situations. Therefore, we assessed their effect on the biological activities and metabolism of PAF. Several statins, including simvastatin, exhibited an inhibitory effect against PAF, comparable with that of PAF-inhibitors. Simvastatin also suppressed in vivo PAF-biosynthesis via the de novo pathway, in leukocytes of 6 simvastatin-treated volunteers. Total cholesterol and low-density lipoprotein cholesterol were also significantly decreased, whereas high-density lipoprotein cholesterol, triacylglycerol, EC50, and lag time were unaffected in these participants. Simvastatin with an intact lactone ring also inhibited PAF-activities, while incubation of human mesangial cells with it also resulted in decreased de novo PAF-biosynthesis. This suggests that these simvastatin-dependent effects are independent of its lactone ring. These new actions of statins should be further studied in PAF-implicated pathological conditions such as CVD, cancer, and renal disease.
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Zotou E, Magkos F, Koutsari C, Fragopoulou E, Nomikos T, Sidossis LS, Antonopoulou S. Acute resistance exercise attenuates fasting and postprandial triglyceridemia in women by reducing triglyceride concentrations in triglyceride-rich lipoproteins. Eur J Appl Physiol 2010; 110:869-74. [PMID: 20607278 DOI: 10.1007/s00421-010-1561-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/23/2010] [Indexed: 10/19/2022]
Abstract
A single bout of endurance exercise lowers fasting and postprandial triglyceride (TG) concentrations in both men and women, by reducing TG in triglyceride-rich lipoproteins (TRLs). The effect of resistance exercise on TRL-TG metabolism is not known; previous studies only measured total plasma TG concentrations and provide conflicting results. Furthermore, none has specifically examined women. We therefore sought to evaluate the effect of a single bout of resistance exercise on TRL-TG metabolism in women. We measured the concentrations of TG in total plasma and TRLs in the fasting state and during an oral fat tolerance test in five healthy untrained women (age: 32 ± 5 years; body mass index: 21.5 ± 1.7 kg/m(2); peak oxygen consumption: 31 ± 4 mL/kg min) in the morning, on two separate occasions: once after a single ~95-min bout of moderate-intensity whole-body resistance exercise (energy expenditure: 2.9 ± 0.1 MJ) and once after an equivalent period of rest, on the preceding afternoon. Fasting plasma TG and TRL-TG concentrations were 22 ± 12 and 40 ± 21% lower, respectively, and postprandial plasma TG and TRL-TG areas-under-the-curve were 24 ± 13 and 27 ± 10% lower, respectively, after exercise than rest (all P values <0.05). Effect sizes ranged from -0.52 to -0.90. Non-TRL-TG concentrations in the fasting and postprandial states were not different between trials (P > 0.60). We conclude that a single bout of resistance exercise attenuates fasting and postprandial triglyceridemia in women by reducing TRL-TG concentrations.
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Tenta R, Panagiotakos DB, Fragopoulou E, Nomikos T, Pitsavos C, Chrysohoou C, Antonopoulou S, Stefanadis C. Osteoprotegerin and nuclear factor-kappaB ligand are associated with leptin and adiponectin levels, in apparently healthy women. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2010; 10:174-179. [PMID: 20516635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVES We investigated the relationship between the major bone turnover markers, i.e., Osteoprotegerin (OPG) and Receptor activator of nuclear factor-kappaB ligand (RANKL) and serum adipokines (leptin, adiponectin) levels in a sample of apparently healthy women. METHODS A random sample which consisted of 80 females (18-71 years) was studied. Elisa method was used to measure the OPG, RANKL and the leptin, adiponectin levels in females' serum. RESULTS OPG values were inversely correlated with leptin (rho = -0.38, p = 0.002) and positively correlated with age (rho = 0.27, p=0.01) and body mass index (rho = 0.29, p=0.009). RANKL values were inversely correlated with adiponectin (rho = -0.23, p = 0.06) and age (rho = -0.30, p=0.01). Additionally, OPG was higher in post- as compared to pre-menopausal women. Further data analysis adjusting for potential confounders revealed that the OPG/RANKL ratio was positively associated with adiponectin and inversely associated with leptin levels independent of the effect of age, body mass index and menopausal status. CONCLUSIONS These results reveal that leptin circulating levels are inversely associated with serum OPG/RANKL ratio among healthy women.
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Letsiou S, Nomikos T, Panagiotakos D, Pergantis SA, Fragopoulou E, Antonopoulou S, Pitsavos C, Stefanadis C. Dietary habits of Greek adults and serum total selenium concentration: the ATTICA study. Eur J Nutr 2010; 49:465-72. [PMID: 20386916 DOI: 10.1007/s00394-010-0105-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Accepted: 03/24/2010] [Indexed: 11/25/2022]
Abstract
PURPOSE The trace element selenium is an essential micronutrient for human health, and its low levels in serum are implicated in the pathogenesis of several chronic diseases. The determination of total serum selenium levels may contribute to the assessment of the health status of all populations. Since the serum selenium levels are highly affected by diet, we assessed its association with the dietary habits of Greek adults. METHODS Serum selenium levels were determined with inductively coupled plasma mass spectrometry in a cohort of 506 participants (men: 296, women: 210) aged 18-75 from the ATTICA study. Food consumption was evaluated with a validated food-frequency questionnaire. RESULTS Evaluation of the relationship between serum total selenium with major food groups and beverages by multi-adjusted analysis revealed that serum selenium was positively correlated with the consumption of red meat (2.37 ± 0.91, p = 0.01) while the consumption of other selenium-containing foods (i.e., fish, cereals, dairy products, vegetables) did not demonstrate such a relationship. Moreover, principal component analysis revealed that the adoption of a vegetarian type of diet is inversely correlated with total selenium (-3.94 ± 2.28, p = 0.08). CONCLUSIONS Among the dietary habits that were examined, red meat seems to be the major determinant of serum selenium in Greek adults.
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Melistas L, Mantzoros CS, Kontogianni M, Antonopoulou S, Ordovas JM, Yiannakouris N. Association of the +45T>G and +276G>T polymorphisms in the adiponectin gene with insulin resistance in nondiabetic Greek women. Eur J Endocrinol 2009; 161:845-52. [PMID: 19755407 PMCID: PMC2896503 DOI: 10.1530/eje-09-0492] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE We explored potential associations of two single nucleotide polymorphisms (SNPs) in the adiponectin gene (ADIPOQ; +45T>G, rs2241766 and +276G>T, rs1501299) with circulating total and high-molecular weight (HMW) adiponectin, insulin resistance (IR), and markers of obesity in a healthy Greek female population. DESIGN AND METHODS The two SNPs were genotyped in 349 women without diabetes (mean age: 47.0+/-12.1 years, mean body mass index: 28.9+/-5.6 kg/m(2)). Total and HMW adiponectin concentrations, body composition variables, IR parameters, and plasma lipid levels were determined. RESULTS In single SNP analysis adjusting for several potential confounders, SNP +276G>T was associated with higher fasting insulin levels (P=0.01) and higher homeostasis model assessment index for IR (HOMA-IR; P=0.009), and SNP +45T>G was associated with lower insulin levels and HOMA-IR (P=0.05 and P=0.07 respectively). No association with total or HMW adiponectin, plasma lipid levels, and body composition variables was observed; however, haplotype analysis revealed that subjects homozygous for the most common +45T/+276G haplotype had lower total adiponectin levels than did noncarriers of this haplotype (P=0.02). The observed differences in HOMA-IR were very significant among women with a higher body fat (BF) percentage (>or= the population median of 41%; all P<or=0.005), but not among leaner individuals (P for interactions 0.01-0.07), thus suggesting that ADIPOQ effects on insulin sensitivity may depend upon BF status. CONCLUSION Our data suggest a significant role of ADIPOQ variants at positions +45 and +276 in the development of IR in healthy Greek women possibly through an interaction with BF.
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Detopoulou P, Panagiotakos DB, Chrysohoou C, Fragopoulou E, Nomikos T, Antonopoulou S, Pitsavos C, Stefanadis C. Dietary antioxidant capacity and concentration of adiponectin in apparently healthy adults: the ATTICA study. Eur J Clin Nutr 2009; 64:161-8. [PMID: 19904292 DOI: 10.1038/ejcn.2009.130] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND/OBJECTIVES This study aimed at evaluating the relationship of adiponectin concentration with total dietary antioxidant capacity in free-living, apparently healthy adults from the ATTICA study. SUBJECTS/METHODS A random subsample from the ATTICA study, consisting of 310 men (40+/-11 years) and 222 women (38+/-12 years), was selected. Adiponectin, along with other inflammatory markers, was measured in fasting participants. Dietary habits were evaluated using a food frequency questionnaire and the dietary antioxidant capacity was based on published values of Italian foods measured by three different assays: ferric-reducing antioxidant power (FRAP), total radical-trapping antioxidant parameters (TRAP) and trolox-equivalent antioxidant capacity (TEAC). RESULTS Positive associations were observed between dietary antioxidant capacity and adiponectin concentration, as assessed with FRAP (b+/-s.e.=0.012+/-0.005, P=0.018 per 1 mmol Fe (II)/day), TRAP (b+/-s.e.=0.030+/-0.013, P=0.017 per 1 mmol trolox equivalent/day) and TEAC (b+/-s.e.=0.025+/-0.012, P=0.042, per 1 mmol trolox equivalent/day) in multiadjusted analysis. Moreover, a negative relation of dietary antioxidant indices with inflammatory markers was revealed. CONCLUSIONS Diets with high antioxidant capacity are related to increased adiponectin levels. An adiponectin-mediated route through which antioxidant-rich foods exert beneficial effects against inflammation and cardiovascular diseases can be thus hypothesized.
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Fragopoulou E, Panagiotakos DB, Pitsavos C, Chrysohoou C, Nomikos T, Evangelopoulos A, Katsagoni C, Skoumas J, Antonopoulou S, Stefanadis C. N-terminal ProBNP distribution and correlations with biological characteristics in apparently healthy Greek population: ATTICA study. Angiology 2009; 61:397-404. [PMID: 19815605 DOI: 10.1177/0003319709350134] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Brain natriuretic peptides are widely used as biomarkers of cardiovascular diseases and mainly heart failure. However, these markers are often found to be high even in apparently healthy participants, and little is known about which factors contribute to physiological change in plasma brain natriuretic peptide (BNP) and amino-terminal pro-B-type natriuretic peptide (NTproBNP) concentration in general populations. In this study, a random subsample of the ATTICA study was used (486 individuals) and serum NT-proBNP was measured. Approximately 20% of the participants had no detectable NT-proBNP values. Women had higher values of NT-proBNP than men (median [25th-75th percentiles]: 30.2 [15.8-54.3] vs 14.9 [4.0-28.1] pg/mL, P < .001]. Amino-terminal pro-B-type natriuretic peptide values were positively correlated with age (rho = .140, P = .006) and inversely with body mass index (BMI; rho = -.142, P = .005), creatinine (Cr) clearance (rho = -.349, P < .001), and hemoglobin (rho = -.249, P < .001) values. Linear regression analysis revealed that gender is the main contributor of NT-proBNP levels, followed by age, BMI, and Cr values.
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Detopoulou P, Nomikos T, Fragopoulou E, Panagiotakos DB, Pitsavos C, Stefanadis C, Antonopoulou S. Lipoprotein-associated phospholipase A2 (Lp-PLA2) activity, platelet-activating factor acetylhydrolase (PAF-AH) in leukocytes and body composition in healthy adults. Lipids Health Dis 2009; 8:19. [PMID: 19500354 PMCID: PMC2703628 DOI: 10.1186/1476-511x-8-19] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2009] [Accepted: 06/05/2009] [Indexed: 11/10/2022] Open
Abstract
Background Lipoprotein-associated phospholipase A2 (Lp-PLA2) also known as serum platelet activating factor acetylhydrolase (PAF-AH) activity constitutes a novel risk marker for cardiovascular disease. Leukocytes constitute one main cellular source of circulating Lp-PLA2. The aim of the present study was to evaluate the association of both serum and leukocyte PAF-AH activities with fat distribution and lean tissue. One hundred healthy volunteers without cardiovascular disease history participated in this study (n = 52 men, 44 ± 13 years and n = 48 women, 43 ± 13 years). Body composition was assessed with dual-energy X-ray absorptiometry, while anthropometrical indices were also measured. The activity of Lp-PLA2 and levels of lipid and glycemic parameters were determined in fasting samples. Results Mean Lp-PLA2 activity was 24.8 ± 4.5 and 19.6 ± 5.0 nmol/min/mL in men and women, respectively (P < 0.001). Mean activity of PAF-AH in leukocyte homogenates was 386 ± 127 pmol/min/mg and 292 ± 92 pmol/min/mg in men and women, correspondingly (P < 0.001). In multiple regression models upper and total adiposity measures were positively associated with Lp-PLA2 activity in men after adjusting for LDL-cholesterol, age, smoking, hs-CRP and physical activity, whereas no associations were found with PAF-AH leukocyte homogenates activity. Hierarchical analysis revealed that the variables with the highest explanatory ability of Lp-PLA2 activity in men, were DXA deriving L1–L4 region of interest and arms fat (increase in R2 = 0.136, P = 0.005 and increase in R2 = 0.118, P = 0.009, respectively), followed by trunk fat and total fat. In women, no association of body composition variables with Lp-PLA2 nor PAF-AH leukocyte homogenates activity was found. Conclusion Lp-PLA2 activity is differentiated across levels of adiposity and topology of adipose tissue, whereas no association was found regarding PAF-AH leukocyte homogenates activity. Our findings suggest that Lp-PLA2 may compensate for the adiposity-associated increases in inflammatory and oxidative burden, in men.
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Detopoulou P, Panagiotakos D, Chrysohoou C, Fragopoulou E, Antonopoulou S, Pitsavos C, Stefanadis C. Abstract: S1-22 DIETARY ANTIOXIDANT CAPACITY IS POSITIVELY RELATED TO CONCENTRATION OF ADIPONECTIN IN HEALTHY ADULTS: THE ATTICA STUDY. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)71461-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Xanthopoulou MN, Nomikos T, Fragopoulou E, Antonopoulou S. Antioxidant and lipoxygenase inhibitory activities of pumpkin seed extracts. Food Res Int 2009. [DOI: 10.1016/j.foodres.2009.02.003] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fragopoulou E, Panagiotakos DB, Pitsavos C, Tampourlou M, Chrysohoou C, Nomikos T, Antonopoulou S, Stefanadis C. The association between adherence to the Mediterranean diet and adiponectin levels among healthy adults: the ATTICA study. J Nutr Biochem 2009; 21:285-9. [PMID: 19369051 DOI: 10.1016/j.jnutbio.2008.12.013] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Revised: 12/05/2008] [Accepted: 12/22/2008] [Indexed: 01/30/2023]
Abstract
Adiponectin is thought to exert anti-inflammatory actions. The aim of the present work was to evaluate the association of long-term adherence to the Mediterranean diet with adiponectin levels, in a sample of cardiovascular disease-free adults. In a random sub-sample of "ATTICA" study, 532 men and women, serum adiponectin was measured. Among several sociodemographic, clinical and biological factors, adherence to the Mediterranean diet was assessed by a special diet score (MedDietSCore) that incorporated the inherent characteristics of this traditional diet. Unadjusted analysis revealed that participants who were in the highest tertile of the diet score had an average 41% higher adiponectin levels, as compared to those who were in the lowest tertile (P<.001). Multiadjusted data analysis showed that compared to the highest tertile of diet score, participants in the middle or the lowest one had an average 0.99+/-0.22 (P=.001) and 1.05+/-0.27 microg/ml (P=.001) lower adiponectin levels after adjusting for age, sex and various bioclinical factors. Adherence to the Mediterranean diet was associated with an increase on adiponectin levels. This finding may partially explain beneficial effects of this traditional healthy diet on the cardiovascular system.
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Letsiou S, Nomikos T, Panagiotakos D, Pergantis SA, Fragopoulou E, Antonopoulou S, Pitsavos C, Stefanadis C. Serum total selenium status in Greek adults and its relation to age. The ATTICA study cohort. Biol Trace Elem Res 2009; 128:8-17. [PMID: 18953500 DOI: 10.1007/s12011-008-8252-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Accepted: 09/29/2008] [Indexed: 10/21/2022]
Abstract
The trace element selenium is an essential micronutrient for human health and its low levels in serum are implicated in the pathogenesis of several chronic diseases. Therefore, the determination of total selenium in serum may contribute to the assessment of the health and nutritional status of certain populations. The objective of the present work was to determine total selenium in the serum of 506 healthy volunteers that participated in the ATTICA study. Selenium was determined in serum by using the technique of inductively coupled plasma mass spectrometry. The mean serum selenium concentration was determined to be 91.8 +/- 33.7 microg/L (N = 506); 87.6% of women and 88.5% of men had serum selenium concentration below 125 microg/L, the cutoff considered to be required for optimal glutathione peroxidase activity. No association was found between serum selenium levels and the gender of the participants while a significant decline of selenium with age (p < 0.0001) was observed. According to our results, no anthropometric, lifestyle, nutritional, or biochemical indices were able to affect the association between serum selenium and age. This result may indicate that other factors such as selenium distribution as well as retention may be affecting the relationship between serum selenium and age.
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Antonopoulou S. Lipid minor constituents in wines. A biochemical approach in the French paradox. INTERNATIONAL JOURNAL OF WINE RESEARCH 2009. [DOI: 10.2147/ijwr.s4587] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Detopoulou P, Nomikos T, Fragopoulou E, Antonopoulou S, Kotroyiannis I, Vassiliadou C, Panagiotakos DB, Chrysohoou C, Pitsavos C, Stefanadis C. Platelet activating factor (PAF) and activity of its biosynthetic and catabolic enzymes in blood and leukocytes of male patients with newly diagnosed heart failure. Clin Biochem 2008; 42:44-9. [PMID: 18955040 DOI: 10.1016/j.clinbiochem.2008.09.113] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2008] [Revised: 09/17/2008] [Accepted: 09/23/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To evaluate platelet activating factor (PAF) levels, its metabolic enzymes activity and its associations with other inflammatory markers in heart failure (HF) patients. DESIGN AND METHODS PAF, and two of its key biosynthetic enzymes [lyso-PAF acetyltransferase (lyso-PAF-AT) and DTT-insensitive CDP-choline:1-alkyl-2-acetyl-sn-glycerol cholinephosphotransferase (PAF-CPT)] along with its catabolic enzymes [PAF-acetylhydrolase (PAF-AH) and lipoprotein-associated phospholipase-A(2) (Lp-PLA(2))] were measured in serum and leukocytes of twelve newly diagnosed male HF patients. Serum CRP, TNF-alpha, IL-6, sCD14 and CD40L were also determined. RESULTS PAF ranged from 0.03 to 5.6 pmol/mL. Median lyso-PAF-AT, PAF-CPT, PAF-AH and Lp-PLA(2) activities were 4.1, 68.42, 644.44 pmol/min/mg protein and 51.42 pmol/min/microL correspondingly. Lyso-PAF-AT and PAF-CPT activities positively correlated with CRP, IL-6 and with each other, whereas PAF-CPT activity correlated with sCD14 and CD40L (P<0.05). CONCLUSIONS PAF's biosynthetic enzyme activities correlated with inflammatory and immunologic molecules, which are activated in HF. Our study indicates a potential role of PAF in HF patients.
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Tsoupras AB, Chini M, Tsogas N, Fragopoulou E, Nomikos T, Lioni A, Mangafas N, Demopoulos CA, Antonopoulou S, Lazanas MC. Anti-platelet-activating factor effects of highly active antiretroviral therapy (HAART): a new insight in the drug therapy of HIV infection? AIDS Res Hum Retroviruses 2008; 24:1079-86. [PMID: 18620493 DOI: 10.1089/aid.2007.0263] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Platelet-activating factor (PAF) is a potent inflammatory mediator, which seems to play a role in the pathogenesis of several AIDS manifestations such as AIDS dementia complex, Kaposi's sarcoma, and HIV-related nephropathy. PAF antagonists have been studied in these conditions with promising results. In order to examine the possible interactions between PAF and antiretroviral therapy, we studied the effect of nucleoside reverse transcriptase inhibitors, non-nucleoside reverse transcriptase inhibitors, and protease inhibitors against PAF biological activities and its basic biosynthetic enzymes dithiothreitol-insensitive PAF-cholinephosphotransferase (PAF-CPT) and lyso-PAF-acetyltransferase (Lyso-PAF-AT), as well as its main degradative enzyme PAF-acetylhydrolase, of human mesangial cell line (HMC). We also studied the effect of several backbones and highly active antiretroviral therapy (HAART) regimens against PAF activity. Among the drugs tested, several inhibited PAF-induced platelet aggregation in a concentration-depended manner, with tenofovir, efavirenz, and ritonavir exhibiting the higher inhibitory effect. In addition, when these drugs were combined in backbones and HAART regimens based on American antiretroviral therapy proposals, they also synergistically exhibited an inhibitory effect against PAF-induced platelet aggregation. Several of these drugs have also inhibited in vitro microsomal PAF-CPT activity, and concentrations of lopinavir-r or tenofovir-DF (similar to their IC(50) against PAF-induced platelet aggregation) exhibited the same effect against PAF-CPT and Lyso-PAF-AT when added in the cell medium of cultured HMC. In addition, in naïve patients treated with one of the most potent anti-PAF HAART regimens (efavirenz/emtricitabine/tenofovir-DF) for a period of 1 month, a significant reduction of the specific activity of PAF-CPT of washed human leukocytes of these patients was also observed, compared with its levels before the HAART treatment. These promising results need to be further studied and confirmed by additional in vivo tests in order to optimize HAART efficacy.
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Kalogeropoulos N, Nomikos T, Chiou A, Fragopoulou E, Antonopoulou S. Chemical composition of Greek avgotaracho prepared from mullet (Mugil cephalus): nutritional and health benefits. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:5916-5925. [PMID: 18576655 DOI: 10.1021/jf8003543] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Crude composition, lipid composition, and tocopherols, ascorbic acid, cholesterol, phytosterols, and squalene content together with fatty acids and antiplatelet activities of total, neutral, and polar lipids of avgotaracho (wax-covered, dried, and salted Mugil cephalus roe) were studied and compared with those of similar products. Wax and steryl esters accounted for 63.7% of roe lipids followed by phosphatidylcholine (PC), which comprised 20.3%. Wax esters were rich in saturated fatty alcohols, monounsaturated fatty acids, and long chain omega3 highly unsaturated fatty acids (HUFA). The fatty acid distribution in roe total and neutral lipids was similar to that of wax esters, while in polar lipids, the omega3 HUFA predominated. Avgotaracho provides significant amounts of protein, fat, alpha-tocopherol, ascorbic acid, and PC, certain amounts of squalene and phytosterols, and cholesterol at levels comparable to hens' eggs. Total, polar, and neutral lipids of avgotaracho exhibited a strong inhibition of platelet activating factors and thrombin, with polar lipids being more active. The results obtained indicate that avgotaracho is a food of high nutritive value, rich in protein and lipids with a healthy lipid profile in terms of omega3/omega6 ratio and major fatty acid classes, while the antiplatelet activity of its oil indicates a putative antithrombotic potential.
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Tsoupras AB, Fragopoulou E, Nomikos T, Iatrou C, Antonopoulou S, Demopoulos CA. Characterization of the de novo biosynthetic enzyme of platelet activating factor, DDT-insensitive cholinephosphotransferase, of human mesangial cells. Mediators Inflamm 2008; 2007:27683. [PMID: 17710109 PMCID: PMC1939920 DOI: 10.1155/2007/27683] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Accepted: 03/08/2007] [Indexed: 11/18/2022] Open
Abstract
Platelet activating factor (PAF), a potent inflammatory mediator, is implicated in several proinflammatory/inflammatory diseases such as glomerulonephritis, glomerulosclerosis, atherosclerosis, cancer, allergy, and diabetes. PAF can be produced by several renal cells under appropriate stimuli and it is thought to be implicated in renal diseases. The aim of this study is the characterization of DTT-insensitive cholinephosphotransferase (PAF-CPT) of human mesangial cell (HMC), the main regulatory enzyme of PAF de novo biosynthetic pathway. Microsomal fractions of mesangial cells were isolated and enzymatic activity and kinetic parameters were determined by TLC and in vitro biological test in rabbit washed platelets. The effect of bovine serum albumin (BSA), dithiothreitol (DTT), divalent cations (Mg2+ and Ca2+), EDTA, and various chemicals on the activity of PAF-CPT of HMC was also studied. Moreover, preliminary in vitro tests have been performed with several anti-inflammatory factors such as drugs (simvastatin, IFNa, rupatadine, tinzaparin, and salicylic acid) and bioactive compounds of Mediterranean diet (resveratrol and lipids of olive oil, olive pomace, sea bass "Dicentrarchus labrax," and gilthead sea bream "Sparus aurata"). The results indicated that the above compounds can influence PAF-CPT activity of HMC.
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Detopoulou P, Panagiotakos DB, Antonopoulou S, Pitsavos C, Stefanadis C. Dietary choline and betaine intakes in relation to concentrations of inflammatory markers in healthy adults: the ATTICA study. Am J Clin Nutr 2008; 87:424-30. [PMID: 18258634 DOI: 10.1093/ajcn/87.2.424] [Citation(s) in RCA: 185] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Choline and betaine are found in a variety of plant and animal foods and were recently shown to be associated with decreased homocysteine concentrations. OBJECTIVE The scope of this work was to investigate the associations between dietary choline and betaine consumption and various markers of low-grade systemic inflammation. DESIGN Under the context of a cross-sectional survey that enrolled 1514 men (18-87 y of age) and 1528 women (18-89 y of age) with no history of cardiovascular disease (the ATTICA Study), fasting blood samples were collected and inflammatory markers were measured. Dietary habits were evaluated with a validated food-frequency questionnaire, and the intakes of choline and betaine were calculated from food-composition tables. RESULTS Compared with the lowest tertile of choline intake (<250 mg/d), participants who consumed >310 mg/d had, on average, 22% lower concentrations of C-reactive protein (P < 0.05), 26% lower concentrations of interleukin-6 (P < 0.05), and 6% lower concentrations of tumor necrosis factor-alpha (P < 0.01). Similarly, participants who consumed >360 mg/d of betaine had, on average, 10% lower concentrations of homocysteine (P < 0.01), 19% lower concentrations of C-reactive protein (P < 0.1), and 12% lower concentrations of tumor necrosis factor-alpha (P < 0.05) than did those who consumed <260 mg/d. These findings were independent of various sociodemographic, lifestyle, and clinical characteristics of the participants. CONCLUSIONS Our results support an association between choline and betaine intakes and the inflammation process in free-eating and apparently healthy adults. However, further studies are needed to confirm or refute our findings.
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Milias GA, Antonopoulou S, Athanasopoulos S. Development, reliability and validity of a new motorized isometric dynamometer for measuring strength characteristics of elbow flexor muscles. J Med Eng Technol 2008; 32:66-72. [DOI: 10.1080/03091900600750363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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77
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Tsoupras AB, Chini M, Tsogas N, Mangafas N, Stamatakis G, Antonopoulou S, Demopoulos CA, Lazanas MC. Effects of highly active antiretroviral therapy (HAART) on platelet activating factor (PAF) metabolism in HIV-infected patients: in vivo results. J Int AIDS Soc 2008. [DOI: 10.1186/1758-2652-11-s1-p105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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78
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Aronis P, Antonopoulou S, Karantonis HC, Phenekos C, Tsoukatos DC. Effect of fast-food Mediterranean-type diet on human plasma oxidation. J Med Food 2007; 10:511-20. [PMID: 17887946 DOI: 10.1089/jmf.2006.235] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Oxidation of lipoproteins, particularly of low-density lipoprotein (LDL), is of prime importance in the initiation and progression of atherosclerosis. The Mediterranean diet has been associated with an unexpectedly low rate of cardiovascular events. Type 2 diabetic patients are at high risk of developing atherosclerosis. Functional alterations in the endothelium, which lead to atherosclerosis, are stimulated by oxidized lipoproteins, particularly oxidized LDL. The present study investigated the effect of Greek quick casual Mediterranean-type diet (fast food Mediterranean-type diet) consumption on the resistance to oxidation in plasma from type 2 diabetic patients and healthy human subjects. Lipids from fast food Mediterranean-type foodstuffs were extracted and tested in vitro for their ability to inhibit copper (Cu2+)-induced LDL oxidation. Foodstuffs that exerted the most potent in vitro antioxidative activity were chosen for the diet of study groups. Eighteen type 2 diabetic patients (group A) and 10 healthy subjects (group B) were fed a 4-week diet contained the chosen foodstuffs, while 17 type 2 diabetic patients (group C) were kept on their regular diet that they were following before the study. Type 2 diabetic patients were treated with sulfonylureas or metformin and were under good glycemic control (hemoglobin A1C < 7%). Serum lipoproteins, triglycerides, glucose, body mass index (BMI), and plasma resistance to Cu2+-induced oxidation before and after the 4-week diet were monitored. At the beginning of the study, no statistical difference was detected in plasma resistance to Cu2+-induced oxidation between type 2 diabetic patients (groups A and C) and healthy human subjects (group B), as this was detected at a time before the oxidation products become detectable, namely, lag time. After the 4-week period on the chosen diet the lag time in groups A and B significantly increased, while it was not changed in group C. In type 2 diabetic patients lag time was increased from 57.3 +/- 13.3 minutes (mean +/- SD) to 103.8 +/- 21.8 minutes (mean +/- SD) (P < .000), while in healthy human subjects there was an increase from 58.0 +/- 8.5 minutes (mean +/- SD) to 85.7 +/- 21.8 minutes (mean +/- SD) (P < .004). In all groups, total cholesterol, high-density lipoprotein-cholesterol, LDL-cholesterol, triglycerides, glucose, and BMI were not changed. Fast food Mediterranean foodstuffs exerted antioxidant activities both in vitro and in vivo after consumption in type 2 diabetic patients and healthy human subjects. Therefore consumption of a fast food Mediterranean-type diet should contribute to prevention against cardiovascular diseases.
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Sakellariou M, Drakakis P, Antonopoulou S, Anagnostou E, Loutradis D, Patargias T. Intravenous infusion of PAF affects ovulation, fertilization and preimplantation embryonic development in NZB x NZW F1 hybrid mice. Prostaglandins Other Lipid Mediat 2007; 85:125-33. [PMID: 18248752 DOI: 10.1016/j.prostaglandins.2007.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2007] [Revised: 11/23/2007] [Accepted: 11/26/2007] [Indexed: 11/18/2022]
Abstract
Platelet Activating Factor (PAF) is a bioactive phospholipid, which exhibits a variety of biological activities and plays a significant role in all aspects of reproduction. In this work, a single intravenous injection of various concentrations of PAF shortly after Human Chorionic Gonadotropin (HCG) administration as well as 24 and 48 h before HCG administration was studied in NZB x NZW F1 hybrid mice. Optimum results were observed when PAF was injected just after the administration of HCG. In this protocol, the concentrations of PAF exhibited bell-shaped response to every stage of development. Any concentration of PAF between 5.5 x 10(-11) and 5.5 x 10(-15)g/g b.w., caused an improved ovulation rate, an increased fertilization rate, an increased rate of cell cycle and an enhanced hatching blastocyst rate (P<0.05 for all stages). Injection of lyso-PAF had no effect in any stage. Our data show that the effect of PAF on early stages of embryo development in vitro is dependent on its way of administration, on the concentrations used as well as on the time PAF is injected.
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Nomikos T, Detopoulou P, Fragopoulou E, Pliakis E, Antonopoulou S. Boiled wild artichoke reduces postprandial glycemic and insulinemic responses in normal subjects but has no effect on metabolic syndrome patients. Nutr Res 2007. [DOI: 10.1016/j.nutres.2007.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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81
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Nomikos T, Fragopoulou E, Antonopoulou S. Food Ingredients and Lipid Mediators. CURRENT NUTRITION & FOOD SCIENCE 2007. [DOI: 10.2174/1573401310703040255] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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82
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Antonopoulou S, Karantonis HC. SEPARATION OF POLAR LIPIDS FROM SOYBEAN OIL AND COTTON SEED OIL BY ONE-STEP HPLC SYSTEM. BIOLOGICAL ACTIVITY OF ISOLATED LIPIDS. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-120003034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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83
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Fragopoulou E, Nomikos T, Karantonis HC, Apostolakis C, Pliakis E, Samiotaki M, Panayotou G, Antonopoulou S. Biological activity of acetylated phenolic compounds. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:80-9. [PMID: 17199317 DOI: 10.1021/jf0627221] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
In recent years an effort has been made to isolate and identify biologically active compounds that are included in the Mediterranean diet. The existence of naturally occurring acetylated phenolics, as well as studies with synthetic ones, provide evidence that acetyl groups could be correlated with their biological activity. Platelet activating factor (PAF) is implicated in atherosclerosis, whereas its inhibitors seem to play a protective role against cardiovascular disease. The aim of this study was to examine the biological activity of resveratrol and tyrosol and their acetylated derivatives as inhibitors of PAF-induced washed rabbit platelet aggregation. Acetylation of resveratrol and tyrosol was performed, and separation was achieved by HPLC. Acetylated derivatives were identified by negative mass spectrometry. The data showed that tyrosol and its monoacetylated derivatives act as PAF inhibitors, whereas diacetylated derivatives induce platelet aggregation. Resveratrol and its mono- and triacetylated derivatives exert similar inhibitory activity, whereas the diacetylated ones are more potent inhibitors. In conclusion, acetylated phenolics exert the same or even higher antithrombotic activity compared to the biological activity of the initial one.
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Antonopoulou S, Fragopoulou E, Karantonis HC, Mitsou E, Sitara M, Rementzis J, Mourelatos A, Ginis A, Phenekos C. Effect of traditional Greek Mediterranean meals on platelet aggregation in normal subjects and in patients with type 2 diabetes mellitus. J Med Food 2006; 9:356-62. [PMID: 17004898 DOI: 10.1089/jmf.2006.9.356] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Patients with type 2 diabetes mellitus have increased risk of cardiovascular disease. Epidemiological studies have shown a correlation between diet and incidence of coronary heart disease. The aim of the study is to determine the effect of a traditional Greek Mediterranean diet on platelet aggregation induced by ADP, arachidonic acid (AA), and especially platelet-activating factor (PAF) on patients with type 2 diabetes mellitus as well as on healthy volunteers. The patients were randomized into two subgroups, A and B. The lipid extracts from traditional Greek Mediterranean-type meals were tested in in vivo for their ability to reduce PAF- or thrombin-induced platelet aggregation. The meals with the most potent anti-aggregating activity were chosen for the diet of both subgroup A and healthy subjects and consumed for a period of 28 days, whereas subgroup B kept to their regular diet that was followed before entering the study. Platelet-rich plasma was isolated before and after the diet, and the ability of platelets to aggregate under the aggregating factors was tested. One-month consumption of diet resulted in a significant reduction in PAF- and ADP-induced aggregation of platelets in both groups of healthy volunteers (PAF and ADP, P < .05) and subgroup A (PAF, P < .001; ADP, P < .05), whereas the AA-induced aggregation was not affected. No effect was observed in subgroup B, which followed the standard diet. Thus the consumption of a traditional Greek Mediterranean diet even for a short period can reduce platelet activity in patients suffering from type 2 diabetes mellitus and in healthy subjects.
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Nomikos TN, Antonopoulou S, Argyropoulos D, Demopoulos CA. DETERMINATION OF PLATELET-ACTIVATING FACTOR BY HPLC WITH FLUORESCENCE DETECTION. J LIQ CHROMATOGR R T 2006. [DOI: 10.1081/jlc-100101735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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86
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Demopoulos CA, Kyrili M, Antonopoulou S, Andrikopoulos NK. Separation of Several Main Glycolipids into Classes and Partially into Species by HPLC and UV-Detection. J LIQ CHROMATOGR R T 2006. [DOI: 10.1080/10826079608005536] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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87
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Demopoulos CA, Antonopoulou S, Andrikopoulos NK, Kapoulas VM. Isolation and Complete Separation of Lipids From Natural Sources. J LIQ CHROMATOGR R T 2006. [DOI: 10.1080/10826079608005517] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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88
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Fragopoulou E, Iatrou C, Antonopoulou S, Ruan XZ, Fernando RL, Powis SH, Moorhead JF, Varghese Z. Platelet-activating factor (PAF) increase intracellular lipid accumulation by increasing both LDL and scavenger receptors in human mesangial cells. ACTA ACUST UNITED AC 2006; 147:281-9. [PMID: 16750665 DOI: 10.1016/j.lab.2006.01.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2005] [Revised: 01/24/2006] [Accepted: 01/25/2006] [Indexed: 11/28/2022]
Abstract
Intra- and extracellular lipid accumulation and the production of inflammatory mediators by renal and accessory cells may play an important role in the initiation and progression of these lesions. Platelet activating factor (PAF) is a biologically active phospholipid that is produced by various cells upon activation by different stimuli. It has been suggested that PAF plays a role in atherogenesis, and several studies indicated its participation in the pathogenesis of renal diseases. The aim of this study is to investigate the role of PAF on intracellular lipid accumulation and gene regulation of lipoprotein receptors in human mesangial cells (HMCs). A human mesangial cell line (HMC) was used to study the effects of PAF on foam cell formation by Oil red O staining and on the expression of LDLr, SR-AI, and PAF-R mRNA using RT-PCR. Native LDL caused foam cell formation in HMC in the presence of PAF. PAF enhanced LDLr expression and overrode LDL receptor suppression induced by a high concentration of LDL. Moreover, it enhanced SR-AI expression. PAF also caused increase in PAF-R expression. The above data suggest that PAF enhances its own receptor expression and then increases lipid accumulation by dysregulating LDL receptor regulation and inducing scavenger receptor expression in HMCs. These results suggest that PAF has a potential role in lipid mediated renal injury.
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MESH Headings
- Cell Line, Transformed
- Cholesterol, LDL/pharmacokinetics
- Foam Cells/cytology
- Foam Cells/metabolism
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/physiology
- Glomerulosclerosis, Focal Segmental/metabolism
- Glomerulosclerosis, Focal Segmental/physiopathology
- Humans
- Lipid Metabolism/drug effects
- Lipid Metabolism/physiology
- Mesangial Cells/cytology
- Mesangial Cells/drug effects
- Mesangial Cells/metabolism
- Platelet Activating Factor/metabolism
- Platelet Activating Factor/pharmacology
- Platelet Membrane Glycoproteins/genetics
- Platelet Membrane Glycoproteins/metabolism
- RNA, Messenger/analysis
- Receptors, G-Protein-Coupled/genetics
- Receptors, G-Protein-Coupled/metabolism
- Receptors, LDL/genetics
- Receptors, LDL/metabolism
- Scavenger Receptors, Class A/genetics
- Scavenger Receptors, Class A/metabolism
- Tritium
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Tsoupras AB, Antonopoulou S, Baltas G, Samiotaki M, Panayotou G, Kotsifaki H, Mantzavinos Z, Demopoulos CA. Isolation and identification of hydroxyl-platelet-activating factor from natural sources. Life Sci 2006; 79:1796-803. [PMID: 16860827 DOI: 10.1016/j.lfs.2006.06.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 05/31/2006] [Accepted: 06/09/2006] [Indexed: 11/17/2022]
Abstract
Platelet-activating factor (PAF), a potent inflammatory mediator that has previously been detected in elevated levels in inflamed gingival tissues, in gingival crevicular fluid (GCF) and in saliva, is implicated in periodontal disease. The biologically active phospholipid detected in gingival crevicular fluid is a hydroxyl-PAF analogue. In a preliminary study this bioactive molecule was detected for the first time in human blood derived from volunteers with chronic periodontitis as well as from periodontally healthy volunteers. Compounds isolated from natural sources as well as synthetic ones have been reported as biologically active lipids with physiological importance based on the fact that they induce platelet aggregation with EC50 values ranging from 100 to 0.01 microM through interaction with G-protein-coupled receptors like the PAF receptor, leading to altered signal transduction. In this study, the existence of hydroxyl-PAF analogue in human blood was further studied as well as its distribution in plasma and in blood components. The existence of hydroxyl-PAF analogue was also investigated in samples from rabbit blood hen's egg yolk. The hydroxyl-PAF analogue was purified by high-performance liquid chromatography, detected by biological assays and identified by electrospray MS analysis. Quantitative determination of PAF and hydroxyl-PAF analogue (expressed as PAF-like activity) showed a statistically significant increase in the ratio of plasma hydroxyl-PAF analogue levels to plasma PAF levels in volunteers with periodontitis. Moreover, hydroxyl-PAF analogue was also detected in rabbit blood and hen's egg yolk samples. These data support that this bioactive lipid may play a role in oral inflammation and suggest PAF as a member of a lipid molecule family with different structures and from different sources which share the same or similar biological activities, apparently with different physiological roles in human and animals.
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Karantonis HC, Fragopoulou E, Antonopoulou S, Rementzis J, Phenekos C, Demopoulos CA. Effect of fast-food Mediterranean-type diet on type 2 diabetics and healthy human subjects' platelet aggregation. Diabetes Res Clin Pract 2006; 72:33-41. [PMID: 16236380 DOI: 10.1016/j.diabres.2005.09.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2004] [Revised: 05/03/2005] [Accepted: 09/06/2005] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The aim of our work was to carry out a randomized clinical trial with a fast-food Mediterranean type diet rich in platelet activating factor (PAF) antagonist to investigate the effect on type 2 diabetics and healthy human subject's platelet aggregation. RESEARCH DESIGN AND METHODS We extracted lipids from fast-food Mediterranean type foodstuffs, and tested them in vitro for their ability to inhibit or antagonize PAF towards washed rabbit platelets. We chose the foodstuffs that exerted the most potent in vitro anti-PAF activity and fed 22 healthy (group A) and 23 type 2 diabetics (group B) subjects on a diet containing the chosen foodstuffs. The 22 type 2 diabetics (group C) subjects were kept on their regular diet that was being followed before entering the study. Before and after a 4-week diet, all enrolled subjects underwent the following examinations; measurement of total cholesterol, low density lipoprotein (LDL-cholesterol), high density lipoprotein (HDL-cholesterol), triglycerides, glucose, HbA(1c), body mass index (BMI), and platelet aggregation in response to PAF, adenosine 5' diphosphate (ADP) and arachidonic acid (AA). RESULTS The chosen diet significantly increased the EC(50) values of PAF and ADP to groups A and B (p<0.05). No statistical difference was observed on the EC(50) value of group C. No statistical differences were detected among Cholesterol, LDL-cholesterol, triglycerides, glucose, HBA(1c), BMI, and EC(50) for AA values, for any of the three groups. CONCLUSIONS Consumption of a fast-food Mediterranean type diet rich in PAF antagonist improved platelet response of type 2 diabetics and healthy human subjects against thrombotic, inflammatory and proatherogenic factors.
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Karantonis HC, Antonopoulou S, Perrea DN, Sokolis DP, Theocharis SE, Kavantzas N, Iliopoulos DG, Demopoulos CA. In vivo antiatherogenic properties of olive oil and its constituent lipid classes in hyperlipidemic rabbits. Nutr Metab Cardiovasc Dis 2006; 16:174-185. [PMID: 16580585 DOI: 10.1016/j.numecd.2005.07.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2004] [Revised: 06/06/2005] [Accepted: 07/07/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND AND AIM The consumption of olive oil has been associated with lower incidence of cardiovascular disease in the Mediterranean countries. This may be due in part to the action of platelet-activating factor (PAF) antagonists which we have previously demonstrated to be present in olive oil. In order to assess the in vivo effects of olive oil lipids and PAF in the development of atherosclerosis, the effects of diet supplementation with olive oil (OO), olive oil polar lipid extract (OOPLE) and olive oil neutral lipid extract (OONLE) were studied in rabbits fed a cholesterol-enriched diet. METHODS AND RESULTS Rabbits were fed for 45 days with atherogenic diet (Group A) supplemented with OO (Group B), OOPLE (Group C) or OONLE (Group D). Lipoprotein profiles, plasma in vitro oxidation, blood PAF levels, PAF-induced platelet aggregation and PAF-acetylhydrolase (PAF-AH) activity, were measured on day 0 and 45. Atherosclerotic lesions formed in the aortic wall and wall elasticity were assessed on day 45. Changes in lipid profile were in accordance with previous studies. Blood PAF levels were higher in group A and decreased in group D on day 45. In rabbits fed an atherogenic diet (Group A) blood PAF and PAF-AH increased, atherosclerotic lesions formed and the elasticity of vessel walls declined. In animals fed olive oil (Group B) or OOPLE (Group C) blood PAF-AH increased, platelet aggregation was attenuated, less oxidation occurred in plasma, lesion thickness was reduced and vessel walls retained elasticity. Most of these beneficial changes were not seen in animals fed OONLE (Group D) although blood PAF and plasma oxidation were lower. CONCLUSIONS The antiatherogenic effects of OO result from OOPLE. The beneficial effect of these factors is linked to PAF metabolism and proaggregant activity.
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92
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Milias GA, Nomikos T, Fragopoulou E, Athanasopoulos S, Antonopoulou S. Effects of baseline serum levels of Se on markers of eccentric exercise-induced muscle injury. Biofactors 2006; 26:161-70. [PMID: 16971747 DOI: 10.1002/biof.5520260301] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Inflammation and oxidative stress have been implicated in the mechanism of eccentric exercise-induced muscle injury. This study examined whether baseline serum levels of selenium (Se), a trace element that participates in both antioxidant and anti-inflammatory systems, affects the overall response to injury. Thirteen males performed 36 maximal eccentric actions with the elbow flexors of the non-dominant arm on a motorized dynamometer. Venous blood samples were collected immediately before and after exercise at 2, 24, 48, 72 and 96 hours. Established indicators of muscle damage such as maximum isometric torque (MIT), range of motion (ROM), relaxed arm angle (RANG), flexed arm angle (FANG), arm circumference (CIRC), muscle soreness and serum levels of creatine kinase (CK) and lactate dehydrogenase (LDH) were determined at the same time points. Baseline serum levels of Se were also measured. Complementary data regarding assessment of Se status were retrieved by the use of a semi-quantitative food frequency questionnaire. All measures changed significantly (p<0.05) after exercise. The main finding of this study was that baseline Se serum levels were associated inversely with CK, LDH and FANG and positively with MIT and ROM (p<0.05). These data suggest that beyond overt Se deficiency, suboptimal Se status possibly worsens muscle functional decrements subsequent to eccentric muscle contractions.
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93
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Karantonis HC, Pitsinos EN, Antonopoulou S, Couladouros EA, Demopoulos CA. Synthesis and biological evaluation of novel steroid-modified ether phospholipids. Chem Phys Lipids 2005; 138:12-9. [PMID: 16202400 DOI: 10.1016/j.chemphyslip.2005.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Revised: 12/17/2004] [Accepted: 07/22/2005] [Indexed: 10/25/2022]
Abstract
Platelet activating factor is one of the most potent inflammatory ether phospholipid mediators known and structurally modified analogues are of considerable interest as potential therapeutic preparations. Inspired by the proposed structure for a novel endogenous hydroxy-PAF analogue isolated recently from gingival crevicular fluid, we designed and prepared two novel steroid-modified ether phospholipids. These two novel compounds exhibit marked chemical and biological similarities to their endogenous prototype and they antagonize it being less active in inducing washed platelet aggregation through PAF receptors.
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94
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Antonopoulou S, Karantonis HC, Nomikos T, Oikonomou A, Fragopoulou E, Pantazidou A. Bioactive polar lipids from Chroococcidiopsis sp. (Cyanobacteria). Comp Biochem Physiol B Biochem Mol Biol 2005; 142:269-82. [PMID: 16198133 DOI: 10.1016/j.cbpc.2005.07.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2005] [Revised: 07/13/2005] [Accepted: 07/14/2005] [Indexed: 11/27/2022]
Abstract
Many studies indicate that various bioactive metabolites subsist in cyanobacteria. Glycolipids of cyanobacteria are reported as molecules that exert specific bioactivities. In this study, total lipids of Chroococcidiopsissp., a coccoid cyanobacterium isolated from a Greek cave, were separated into neutral and polar-lipids and the latter were further fractionated by high-performance liquid chromatography (HPLC). Each polar lipid fraction was tested in vitro for its ability to inhibit platelet-activating factor (PAF)- and thrombin-induced washed rabbit platelet aggregation and/or to cause platelet aggregation. The structures of the most active fractions were elucidated by biological assays and identified by electrospray mass spectrometry. One fraction was a potent inhibitor of PAF-induced platelet aggregation. Structural studies of this fraction indicated the existence of phospho-glyco analog of ceramide. Another fraction that was a potent inhibitor of PAF- as well as of thrombin-induced platelet aggregation was structurally elucidated as a phospho-acetylated glyco-analog of diglyceride. The fraction that induced platelet aggregation was identified as a phospho-acetylated-glyco analog of ceramide. These novel bioactive polar lipids in cyanobacteria in regard to the structure and biological activity may contribute to the allergic character of cyanobacteria.
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95
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Milias GA, Nomikos T, Fragopoulou E, Athanasopoulos S, Antonopoulou S. Effects of eccentric exercise-induced muscle injury on blood levels of platelet activating factor (PAF) and other inflammatory markers. Eur J Appl Physiol 2005; 95:504-13. [PMID: 16151835 DOI: 10.1007/s00421-005-0031-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2005] [Indexed: 11/25/2022]
Abstract
It has been reported that exercise with eccentric contractions can induce damage and inflammation in human muscle tissue, the severity of which depends on the duration and the intensity of exercise. Platelet activating factor (PAF) is a potent inflammatory mediator implicated in a series of pathophysiological conditions. We sought to investigate the relationship between PAF and eccentric exercise induced muscle damage. Thirteen healthy, recreationally active male subjects (27.5+/-3.78 year) performed 36 maximum voluntary eccentric contractions on a motorized muscle dynamometer using the elbow flexor muscles of the non-dominant arm. Venous blood samples were collected immediately before and after exercise at 2, 24, 48, 72 and 96 h. PAF was isolated, purified and determined by a platelet aggregation assay. Serum levels of creatine kinase (CK), lactate dehydrogenase (LDH), C-reactive protein (CRP) and complement C3 (C3), plasma level of fibrinogen and whole blood level of leukocytes (and their subsets) were determined. Established indicators of muscle damage as maximum isometric torque (MIT), range of motion (ROM), relaxed arm angle (RANG), flexed arm angle (FANG), arm circumference (CIRC) and muscle soreness were also measured at the same time points. PAF, leukocytes, CK and LDH were elevated after exercise, while other biochemical parameters such as CRP, C3 and fibrinogen were unchanged. We also observed an inverse association between PAF and MIT and ROM, as well as a positive association with other markers of muscle injury, i.e. CK, LDH, FANG and CIRC (all P's<0.05). Our findings may imply a role for PAF in the mechanism of eccentric exercise induced muscle damage.
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96
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Antonopoulou S, Nomikos T, Oikonomou A, Kyriacou A, Andriotis M, Fragopoulou E, Pantazidou A. Characterization of bioactive glycolipids from Scytonema julianum (cyanobacteria). Comp Biochem Physiol B Biochem Mol Biol 2005; 140:219-31. [PMID: 15649769 DOI: 10.1016/j.cbpc.2004.10.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2004] [Revised: 10/07/2004] [Accepted: 10/12/2004] [Indexed: 11/28/2022]
Abstract
Cyanobacteria serve as a rich source of novel bioactive metabolites. Few studies on glycolipids reported them as having specific biological activities. In this study, total lipids of Scytonema julianum, a filamentous cyanobacterium isolated from a Greek cave, were separated into neutral and phospho- and glycolipids, and the latter were further fractionated by high-performance liquid chromatography (HPLC). Each glycolipid fraction was tested in vitro for its ability to inhibit platelet-activating factor (PAF)- and thrombin-induced washed rabbit platelet aggregation and/or to cause platelet aggregation. The structures of the most active fractions were elucidated by biological assays, by chemical determinations and identified by electrospray mass spectrometry. One fraction was a potent inhibitor of PAF-induced platelet aggregation. Structural studies of this fraction indicated the existence of a phosphoglyco-analog of acyl-sphingosine. Two fractions causing platelet aggregation were detected and identified as phosphoglycolipids. The first one was identified as a phosphoglyco-analog of acyl-acetylated sphingosine and the second one as a glyco-analog of phosphatidylglycerol. The presence of the above bioactive compounds demonstrates new types of lipids in cyanobacteria in regard to the structure and biological activity. In addition, the identified bioactive lipids may contribute to the allergic character of cyanobacteria.
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97
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Manios Y, Antonopoulou S, Kaliora AC, Felliou G, Perrea D. Dietary intake and biochemical risk factors for cardiovascular disease in two rural regions of Crete. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2005; 56 Suppl 1:171-81. [PMID: 15800393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Accepted: 02/15/2005] [Indexed: 05/02/2023]
Abstract
The aim of the present study was to identify any possible protective effects of wild greens on certain biochemical cardiovascular disease (CVD) risk factors in elderly women leaving in rural Crete. For the needs of the study a region with high consumption of wild greens (Avdou) and a region with low consumption (Anogia) were identified and a representative population from each area was recruited (n= 37 and n=35 respectively). Serum lipids and fibrinogen levels, total antioxidant capacity (TAC), soluble intercellular adhesion molucule-1 (sVCAM-1), soluble vascular adhesion molucule-1 (s-ICAM-1) and haematological factors were measured in both regions during winter and summer time when wild-green plants consumption is high and low, respectively. Regarding classic lipid risk factors for arteriosclerosis no significant different between the two regions were detected. TAC was found higher in Avdou compared to Anogia during winter screening, but null in both regions during summer. Fibrinogen was found higher in Avdou compared to Anogia while no differences between the two regions were detected for sVCAM-1 and s-ICAM-1 in both screenings. The significantly higher TAC and fibrinogen values detected in Avdou could be attributed to the higher wild green consumption in that region since recent data indicated that their content in vitamin C and E as well as flavonoids is particularly high.
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98
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Antonopoulou S, Tsoupras A, Baltas G, Kotsifaki H, Mantzavinos Z, Demopoulos CA. Hydroxyl-platelet-activating factor exists in blood of healthy volunteers and periodontal patients. Mediators Inflamm 2004; 12:221-7. [PMID: 14514473 PMCID: PMC1781616 DOI: 10.1080/09629350310001599666] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Periodontal diseases are localized chronic inflammatory conditions of the gingival and underlying bone and connective tissue. Platelet-activating factor (PAF), a potent inflammatory phospholipid mediator that has been previously detected in elevated levels in inflamed gingival tissues, in gingival crevicular fluid and in saliva, is implicated in periodontal disease. Our results from previous studies showed that the biologically active phospholipid detected in gingival crevicular fluid is a hydroxyl-PAF analogue. In this study, hydroxyl-PAF analogue was detected for the first time in human blood derived from patients with chronic periodontitis as well as from periodontally healthy volunteers. The hydroxyl-PAF analogue was purified by high-performance liquid chromatography, detected by biological assays and identified by electrospray analysis. In addition, the quantitative determination of PAF and hydroxyl-PAF analogue (expressed as PAF-like activity) showed a statistically significant increase in the ratio of hydroxyl-PAF analogue levels to PAF levels in periodontal patients, suggesting that this bioactive lipid may play a role in oral inflammation.
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99
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Demopoulos CA, Karantonis HC, Antonopoulou S. Platelet activating factor— a molecular link between atherosclerosis theories. EUR J LIPID SCI TECH 2003. [DOI: 10.1002/ejlt.200300845] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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100
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Fragopoulou E, Antonopoulou S, Nomikos T, Demopoulos CA. Structure elucidation of phenolic compounds from red/white wine with antiatherogenic properties. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1632:90-9. [PMID: 12782155 DOI: 10.1016/s1388-1981(03)00066-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The oxidative modification of low-density lipoproteins (LDL) is supposed to play a critical role in atherogenesis. During this oxidation a potent inflammatory phospholipid mediator named platelet activating factor (PAF) is produced, and it is believed to be the key for the initiation of the inflammation and therefore for the process of atherogenesis. From many studies, it is established that wine has beneficial effects on health, including protection against cardiovascular diseases. According to our point of view, the cardioprotective effect of wine may be attributed partly to the existence of PAF antagonists in red or white wine and partly to the existence of antioxidants that reduce the oxidation of LDL and therefore the production of PAF. In this study, wine compounds that antagonize PAF were isolated and purified via chromatographic procedures, and determined structurally using chemical, enzymatic and spectroscopic methods.
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