Cardiovascular Disease: What’s Choline Got to Do With It?
Our Answer to the 2011 Study in Nature ‘Gut flora metabolism of phosphatidylcholine promotes cardiovascular disease’
Phosphatidyl Choline (PC) is the largest of the phospholipids that comprise the membrane of our cells. PC is also prominent in egg and soy lecithin. While PC may be the largest of the phosphatides in lecithin there are other principle phospholipids, phosphatidyl-ethanolamine (PE), phosphatidyl-inositol (PI), phosphatidyl-serine and phosphatidic acid that together, constitute a higher concentration in lecithin than does PC. Soybeans are the principle source of commercial lecithin, and lecithin is the most important by-product of the soy oil processing industry because of its many applications in foods, cosmetics and industrial products. Lecithin is also available as a dietary supplement in two forms: as granular lecithin which contains ~12% PC (calcium phosphate as a flow agent), and in a concentrated form called triple lecithin at ~35% PC in capsules fluidized with soy oil (Wood and Allison 1981). While lecithin has been on the health food scene for over a half century, somehow, it picked up the perception of being called phosphatidylcholine. Many researchers used the two interchangeably as if they were the same. They are not. Lecithin is not PC, and while PC is the largest phosphatide in lecithin, technically, it is only a chemical component of lecithin. Oddly, no one reverses it by saying PC when referring to lecithin.
In April, 2011 in an article in Nature, Gut flora of phosphatidylcholine promotes cardiovascular disease, Wang et al wrote that “Foods rich in the lipid phosphatidylcholine (PC, also called lecithin)* which predominantly include eggs, milk, liver, red meat, poultry, shell fish and fish, are believed to be the major dietary sources for choline”. Note the age-old error again. However, confusing PC and lecithin pales in comparison to the egregious characterization in the title saying that “phosphatidylcholine promotes cardiovascular disease”. We must presume the authors to be knowledgeable of the long and voluminous history of PC as the largest phospholipid component of our cellular membranes and especially as a nutrient with its quite exceptional history in alleviating heart health disorders specifically cardiovascular disease. The title ‘Gut flora of phosphatidylcholine promotes cardiovascular disease’ completely disregards the scientific history of PC and casts a disturbing and untrue image of a highly valuable nutrient with a long history of lowering cholesterol and successful treatment of atherosclerosis, (Cho BH 2011, Navab M 2003, Chung BH 2005, Hajj Hassan H 2005, Koizumi J 1988, Ke Y 1996, Ovesen L 1985). The title could be correct if lecithin was used, which if intended, should have been so stated.
The disturbing title further calls in question the veracity of what appears to be significant scientific information. The implication of PC as potentially dangerous is simply wrong; however, if lecithin was used, the study becomes of significant value for shedding light on the difficulty of using lecithin as a nutrient. While there have been a large number of studies over the last 50 years using lecithin as a source for PC, the effort to achieve medical benefits have been plagued with mixed results, while the reverse of using phosphatidylcholine has consistently maintained positive medical results particularly in international studies. Research and clinical experience has revealed that PC is possibly the most prestigious nutrient of all (Yechiel and Barenholtz 1985, Cui and Howling 2002).
* The authors again make the mistake of referring to PC as Lecithin.
Rhone Poulanc, in its brochure for Lipostabil, lists 197 references for oral and i.v. administration of PC for hyperlipoproteinemia and atherosclerosis. Gundermann KJ, PhD, MD, in “The Essential Phospholipids as a Membrane Therapeutic” 1993, has 776 referenced studies in his technical manual which covers the use of PC in toxicology, hemorrheology, lipid peroxidation, alcohol and diabetic fatty liver, malnutrition, kidney, cirrhosis, gastrointestinal, neurological, lung, psoriasis, MS, cerebral circulation, elevated lipids, atherosclerosis, even drug enhancement. It is a thorough review of PC research published from 1959 to 1993, which portrays a positive image of PC quite the opposite as in the Nature study.
Using lecithin as a source of PC is a poor scientific approach because the phospholipids within lecithin are oil based. The PC used in the European studies was either egg PC, or, if soy lecithin based, the oil had been purged and the phospholipids were isolated. In the 1940s, Nattermann GMBH, successfully produced a high concentrated PC from lecithin in an oil free form called Phospholipon which was the source for the PC used in all the medical studies previously mentioned. The formation of the membrane occurs in water and cannot occur if the lipid tails of the phospholipids are immersed in oil. Oil and water do not mix, but oil and oil mix very well. All life on the planet is water based and depends on the “hydrophobic effect” to drive the formation of the membrane of all cells. There is little excuse for the continued PC / lecithin confusion or the implication of PC as a troublesome nutrient.
Under normal digestion, PC and all lipids ingested are degraded by lipases in the gut. The phospholipids and the triglycerides are reduced by enzymes PLC or PLD which attack the head groups (choline, ethanolamine, etc) with PLA1 or PLA2 doing the same for the lipid tails. The PC research reports referenced above did not use raw lecithin as a source of PC. The majority of the PC was either i.v. Essentiale (Aventis) or Lipostabil (Rhone Poulanc) or, as a PC capsule “Forte” under both labels. Forte is currently available in most European and Eastern European pharmacies, i.v. Essentiale is available in Eastern Europe and the US, all of which used phosphatidylcholine that originated from Nattermann, which, as already indicated, is no longer lecithin.
In the 2011 Nature paper by Wang et al, there are 18 listed authors from the Cleveland Clinic, UCLA, Cleveland State, and USC. It is appalling that such a prestigious journal, Nature, would permit such gross error in basic biochemistry. The article does indeed help to resolve the age-old problem of why lecithin has consistently failed to provide positive results as a phosphatidylcholine nutritional supplement, because it isn’t phosphatidyl choline. The implication of Choline and TMAO in CVD was also corroborated in a number of studies prior to the Nature study such as recent publications from Italy in 2005, UNC in 2007, Emory and Aventis in 2009 and from Germany in 2007 - 2010, to name a few. However, none of these publications mentioned lecithin or even PC as a critical choline source or of PC in promoting cardiovascular disease. In light of the abundant positive research for phosphatidyl choline for over half a century, the choice of the title in the April 2011 Nature paper borders on scientific ignorance and demands a retraction.
In the Nature study it is prudent to bear in mind that the laboratory animals were inbred strains, predisposed to CVD.
There is clear evidence that choline released from the cell membrane by ischemia-related cytolysis may be used as a predictor of cardiac events in the presence of chest pain, despite low levels of troponin. (Danne, 2007) In this regard, choline elevation is a result of tissue damage (vulnerable plaque), and is not a causative agent.
Specific gut bacteria will degrade choline to trimethylamine, which is then oxidized by the liver to TMAO. The liver enzyme, Hepatic Flavin Monooxygenase 3 (FMO3) is responsible for the conversion. (It may be important to note that this is a “flavin” enzyme, dependent upon riboflavin for its activity. Without further attention, it is unseemly to indict this B vitamin as part of the etiology of CVD.) TMAO—and its companion choline metabolite, betaine—promote upregulation of multiple macrophage scavenger receptors as part of the inflammatory cascade, following platelet activation and monocyte adhesion, but preceding the formation of macrophage foam cells from the endocytosis of oxidized LDL and the subsequent smooth muscle cell migration from vascular epithelium that forms protective fibrous caps. Foam cells that accrue from this phagocytosis comprise the fatty streaks of the plaques of atheroma in the vascular intima. Foam cells necrotize and cause the fibrous cap to rupture and form a thrombus which can lead to emboli capable of occluding smaller blood vessels.
Knowing that gut flora may generate a pro-atherosclerotic metabolite has aroused interest in probiotic research. Lactobacillus rhamnosus appears to potentiate the colonic manufacture of TMAO, while L. paracasei has inhibitory properties on the formation of TMAO. Both strains are dose-dependent. If the inflammation induced by TMAO can be eliminated, or at least curtailed, the number of related cardiac events can be limited. Disrupting the inflammatory cascade that provokes foam cell induction may be as simple as preventing the oxidation of LDL in the first place. Several dietary components have demonstrated the capability to prevent LDL oxidation, including capsaicin, curcumin, and several bioflavonoids.
The information contained in this web site is for educational purposes only and is not intended or implied to be a substitute for professional medical advice. Inclusion here does not imply any endorsement or recommendation. Always seek the advice of your physician or other qualified medical provider for all medical problems prior to starting any new regiment.
Nature Volume: 472, Pages: 57–63 Date published: (07 April 2011)
Gut flora metabolism of phosphatidylcholine promotes cardiovascular disease
Zeneng Wang,1, 2 Elizabeth Klipfell,1, 2 Brian J. Bennett,3 Robert Koeth,1 Bruce S. Levison,1, 2 Brandon DuGar,1 Ariel E. Feldstein,1, 2 Earl B. Britt,1, 2 Xiaoming Fu,1, 2 Yoon-Mi Chung,1, 2 Yuping Wu,4 Phil Schauer,5 Jonathan D. Smith,1, 6 Hooman Allayee,7 W. H. Wilson Tang,1, 2, 6 Joseph A. DiDonato,1, 2 Aldons J. Lusis3 & Stanley L. Hazen1, 2, 6 Department of Cell Biology, Cleveland Clinic, Cleveland, Ohio 44195, USA, Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic, Cleveland, Ohio 44195, USA, Department of Medicine/Division of Cardiology, BH-307 Center for the Health Sciences, University of California, Los Angeles, California 90095, USA, Department of Mathematics, Cleveland State University, Cleveland, Ohio 44115, USA, Bariatric and Metabolic Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA, Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio 44195, USA, Department of Preventive Medicine and Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California 90089, USA
Abstract: Metabolomics studies hold promise for the discovery of pathways linked to disease processes. Cardiovascular disease (CVD) represents the leading cause of death and morbidity worldwide. Here we used a metabolomics approach to generate unbiased small-molecule metabolic profiles in plasma that predict risk for CVD. Three metabolites of the dietary lipid phosphatidylcholine—choline, trimethylamine N-oxide (TMAO) and betaine—were identified and then shown to predict risk for CVD in an independent large clinical cohort. Dietary supplementation of mice with choline, TMAO or betaine promoted upregulation of multiple macrophage scavenger receptors linked to atherosclerosis, and supplementation with choline or TMAO promoted atherosclerosis. Studies using germ-free mice confirmed a critical role for dietary choline and gut flora in TMAO production, augmented macrophage cholesterol accumulation and foam cell formation. Suppression of intestinal microflora in atherosclerosis-prone mice inhibited dietary-choline-enhanced atherosclerosis. Genetic variations controlling expression of flavin monooxygenases, an enzymatic source of TMAO, segregated with atherosclerosis in hyperlipidaemic mice. Discovery of a relationship between gut-flora-dependent metabolism of dietary phosphatidylcholine and CVD pathogenesis provides opportunities for the development of new diagnostic tests and therapeutic approaches for atherosclerotic heart disease.
Fed Proc. 1982 Dec;41(14):3015-21.
Effects of consumption of choline and lecithin on neurological and cardiovascular systems. Wood JL, Allison RG.
This report concerns possible adverse health effects and benefits that might result from consumption of large amounts of choline, lecithin, or phosphatidylcholine. Indications from preliminary investigations that administration of choline or lecithin might alleviate some neurological disturbances, prevent hypercholesteremia and atherosclerosis, and restore memory and cognition have resulted in much research and public interest. Symptoms of tardive dyskinesia and Alzheimer’s disease have been ameliorated in some patients and varied responses have been observed in the treatment of Gilles de la Tourette’s disease, Friedreich’s ataxia, levodopa-induced dyskinesia, mania, Huntington’s disease, and myasthenic syndrome. Further clinical trials, especially in conjunction with cholinergic drugs, are considered worthwhile but will require sufficient amounts of pure phosphatidylcholine. The public has access to large amounts of commercial lecithin. Because high intakes of lecithin or choline produce acute gastrointestinal distress, sweating, salivation, and anorexia, it is improbable that individuals will incur lasting health hazards from self-administration of either compound. Development of depression or supersensitivity of dopamine receptors and disturbance of the cholinergic-dopaminergic-serotinergic balance is a concern with prolonged, repeated intakes of large amounts of lecithin.
Circulation. 2003;108:1735-9 Oral Synthetic Phospholipid (DMPC) Raises High-Density Lipoprotein Cholesterol Levels, Improves High-Density Lipoprotein Function, and Markedly Reduces Atherosclerosis in Apolipoprotein E–Null Mice
Mohamad Navab, PhD; Susan Hama, BSc; Greg Hough, MS; Alan M. Fogelman, MD From the Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, Calif.
Background: Lecithin has been widely sold as a dietary supplement. 1,2-Dimyristoyl-sn-glycero-3-phosphocholine (DMPC) is a phospholipid that does not exist in nature and has been used in vitro to study lipid binding. We tested DMPC in vivo in apolipoprotein (apo) E–null mice.
Methods and Results: DMPC or soy or egg lecithin at 1.0 mg/mL was added to the drinking water of 4-week-old apoE-null female mice. Eight weeks later, HDL cholesterol levels and apoA-I levels were markedly increased in the mice that received DMPC. HDL function was also dramatically improved in the mice receiving DMPC, and there was a significant reduction in aortic lesions (P=0.021) in the DMPC mice but not in those receiving lecithin. Adding 1.0 mg/mL of DMPC to the drinking water of 10-month-old apoE-null female mice for 5 weeks caused regression of aortic sinus lesions (P=0.003). Adding 1.0 mg/mL DMPC to the drinking water of 6-month-old apoE-null male mice for 8 weeks significantly reduced aortic sinus lesion area (P=0.0031) and en face whole aorta lesion area (P=0.001), whereas adding the same concentrations of soy or egg lecithin did not significantly alter lesion area. Jejunal apoA-I synthesis and plasma apoA-I levels were increased 2- to 3-fold in mice receiving DMPC but not soy or egg lecithin.
Conclusions: DMPC (but not lecithin) raises HDL cholesterol and apoA-I, improves HDL function, and prevents lesions or causes their regression in apoE-null mice.
Exp Biol Med (Maywood). 2010 Oct;235(10):1194-203.
Synthetic dimyristoylphosphatidylcholine liposomes assimilating into high-density lipoprotein promote regression of atherosclerotic lesions in cholesterol-fed rabbits.
Cho BH, Park JR, Nakamura MT, Odintsov BM, Wallig MA, Chung BH. Harlan E Moore Heart Research Foundation, Champaign, IL 61820, USA. email@example.com
Abstract: We have reported recently that enrichment of high-density lipoprotein (HDL) with phosphatidylcholine (PC) liposomes is effective in solubilizing cholesterol from isolated human atherosclerotic plaques. In the present study, we investigated the in vivo effect of enrichment of HDL with PC on regression of diet-induced atherosclerosis in rabbits. As part of the study, a preliminary in vitro study on blood collected from the cholesterol-fed rabbits was performed to assess the capacity of the HDL density (d > 1.063 g/mL) plasma fraction from cholesterol-fed rabbits to assimilate multilamellar liposomes of synthetic dimyristoylphosphatidylcholine (DMPC). This was compared with the capacities of egg- and soy-PC liposomes to be assimilated into the HDL density plasma fraction. The capacity of the HDL density fraction to absorb PC from DMPC liposomes (11.5 mg/mL) was more than 10 times greater than egg or soy liposomes. Therefore, DMPC liposomes were chosen to infuse into cholesterol-fed rabbits. Cholesterol-fed rabbits infused weekly with DMPC liposomes (300 mg/kg body weight) for five weeks had significantly decreased aortic cholesterol contents (P < 0.05) compared with saline-infused cholesterol-fed controls. Atherosclerotic plaque volume, as measured by a type of new magnetic resonance imaging analysis, also decreased significantly (P < 0.05) after DMPC treatment. The present findings suggest that the enrichment of HDL with PC via intravenous infusion of synthetic DMPC liposomes could be a potential therapeutic approach for atherosclerotic plaque regression.
Circulation. 2003 Oct 7;108(14):1735-9.
Oral synthetic phospholipid (DMPC) raises high-density lipoprotein cholesterol levels, improves high-density lipoprotein function, and markedly reduces atherosclerosis in apolipoprotein E-null mice.
Navab M, Hama S, Hough G, Fogelman AM. Division of Cardiology, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Room 47-123 CHS, 10833 Le Conte Ave, Los Angeles, Calif 90095-1679, USA. firstname.lastname@example.org
BACKGROUND: Lecithin has been widely sold as a dietary supplement. 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) is a phospholipid that does not exist in nature and has been used in vitro to study lipid binding. We tested DMPC in vivo in apolipoprotein (apo) E-null mice.
METHODS AND RESULTS: DMPC or soy or egg lecithin at 1.0 mg/mL was added to the drinking water of 4-week-old apoE-null female mice. Eight weeks later, HDL cholesterol levels and apoA-I levels were markedly increased in the mice that received DMPC. HDL function was also dramatically improved in the mice receiving DMPC, and there was a significant reduction in aortic lesions (P=0.021) in the DMPC mice but not in those receiving lecithin. Adding 1.0 mg/mL of DMPC to the drinking water of 10-month-old apoE-null female mice for 5 weeks caused regression of aortic sinus lesions (P=0.003). Adding 1.0 mg/mL DMPC to the drinking water of 6-month-old apoE-null male mice for 8 weeks significantly reduced aortic sinus lesion area (P=0.0031) and en face whole aorta lesion area (P=0.001), whereas adding the same concentrations of soy or egg lecithin did not significantly alter lesion area. Jejunal apoA-I synthesis and plasma apoA-I levels were increased 2- to 3-fold in mice receiving DMPC but not soy or egg lecithin.
CONCLUSIONS: DMPC (but not lecithin) raises HDL cholesterol and apoA-I, improves HDL function, and prevents lesions or causes their regression in apoE-null mice.
Biochim Biophys Acta. 2005 Mar 21;1733(1):76-89.
Phosphatidylcholine-rich acceptors, but not native HDL or its apolipoproteins, mobilize cholesterol from cholesterol-rich insoluble components of human atherosclerotic plaques.
Chung BH, Franklin F, Liang P, Doran S, Cho BH, Curcio CA. Gerontology Division, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA. email@example.com
Abstract: To examine the potential of high density lipoproteins (HDL) to ameliorate atherosclerotic plaques in vivo, we examined the ability of native HDL, lipid-free HDL apolipoproteins (apo HDL), cholesterol-free discoidal reconstituted HDL (R-HDL) comprised of apo HDL and phosphatidylcholine (PC) and PC liposomes to release cholesterol from cholesterol-rich insoluble components of plaques (ICP) isolated from atherosclerotic human aorta. Isolated ICP had a free cholesterol (FC) to phospholipid (PL) mass ratio (0.8-3.1) and a sphingomyelin (SPM) to PC mass ratio (1.2-4.2) that exceeded those of plasma membranes of cultured cells. Surprisingly, native HDL and its apolipoproteins were not able to release cholesterol from ICP. However, R-HDL and PC liposomes were effectively released cholesterol from ICP. The release of ICP cholesterol by R-HDL was dose-dependent and accompanied by the transfer of > 8 x more PC in the reverse direction (i.e., from R-HDL to ICP), resulting in a marked enrichment of ICP with PC. Compared to R-HDL, PC liposomes were significantly less effective in releasing cholesterol from ICP but were somewhat more effective in enriching ICP with PC. Native HDL was minimally effective in enriching ICP with PC, but became effective after prior in vitro enrichment of HDL with PC from multilamellar PC liposomes. The enrichment of ICP with PC resulted in the dissolution of cholesterol crystals on ICP and allowed the removal of ICP cholesterol by apo HDL and plasma. Our study revealed that the removal of cholesterol from ICP in vivo will be possible through a change in the level, composition, and physical state of ICP lipids mediated by PC-enriched HDL.
J Lipid Res. 2005 Jul;46(7):1457-65.
Structural modification of plasma HDL by phospholipids promotes efficient ABCA1-mediated cholesterol release.
Hajj Hassan H, Blain S, Boucher B, Denis M, Krimbou L, Genest J. Cardiovascular Genetics Laboratory, Cardiology Division, McGill University Health Center/Royal Victoria Hospital, Montréal, Québec H3A 1A1, Canada.
Abstract: It has been suggested that ABCA1 interacts preferentially with lipid-poor apolipoprotein A-I (apoA-I). Here, we show that treatment of plasma with dimyristoyl phosphatidylcholine (DMPC) multilamellar vesicles generates prebeta(1)-apoA-I-containing lipoproteins (LpA-I)-like particles similar to those of native plasma. Isolated prebeta(1)-LpA-I-like particles inhibited the binding of (125)I-apoA-I to ABCA1 more efficiently than HDL(3) (IC(50) = 2.20 +/- 0.35 vs. 37.60 +/- 4.78 microg/ml). We next investigated the ability of DMPC-treated plasma to promote phospholipid and unesterified (free) cholesterol efflux from J774 macrophages stimulated or not with cAMP. At 2 mg DMPC/ml plasma, both phospholipid and free cholesterol efflux were increased ( approximately 50% and 40%, respectively) in cAMP-stimulated cells compared with unstimulated cells. Similarly, both phospholipid and free cholesterol efflux to either isolated native prebeta(1)-LpA-I and prebeta(1)-LpA-I-like particles were increased significantly in stimulated cells. Furthermore, glyburide significantly inhibited phospholipid and free cholesterol efflux to DMPC-treated plasma. Removal of apoA-I-containing lipoproteins from normolipidemic plasma drastically reduced free cholesterol efflux mediated by DMPC-treated plasma. Finally, treatment of Tangier disease plasma with DMPC affected the amount of neither prebeta(1)-LpA-I nor free cholesterol efflux. These results indicate that DMPC enrichment of normal plasma resulted in the redistribution of apoA-I from alpha-HDL to prebeta-HDL, allowing for more efficient ABCA1-mediated cellular lipid release. Increasing the plasma prebeta(1)-LpA-I level by either pharmacological agents or direct infusions might prevent foam cell formation and reduce atherosclerotic vascular disease.
J Lipid Res. 1988 Nov;29(11):1405-15.
Behavior of human apolipoprotein A-I: phospholipid and apoHDL: phospholipid complexes in vitro and after injection into rabbits.
Koizumi J, Kano M, Okabayashi K, Jadhav A, Thompson GR. MRC Lipoprotein Team, Hammersmith Hospital, London, U.K.
Abstract: Apolipoprotein A-I was purified from human high density lipoprotein and complexed with polyunsaturated phosphatidylcholine (PC) in deoxycholate (Lipostabil); the bile salt was removed subsequently by dialysis. The behavior of the resultant apoA-I/PC complexes was compared with that of Lipostabil in vitro and after injection into rabbits. In vivo apoA-I/PC complexes had the density of HDL throughout but had both alpha and pre beta electrophoretic mobility, the latter probably reflecting dissociation of apoA-I from PC. Lipostabil initially behaved like LDL but gradually acquired the density of HDL after incubation with plasma and in vivo. Both preparations increased plasma total phospholipids in normolipidemic rabbits to a similar extent, but, increments in HDL phospholipid were greater after apoA-I/PC complexes were injected. ApoHDL/PC complexes, prepared in a similar manner, appeared to promote efflux of cholesterol from perfused rabbit aortas in the presence of lecithin:cholesterol acyltransferase (LCAT) activity, consistent with a stimulatory effect on cholesterol mobilization. Injection of apoHDL/PC complexes into hyperlipidemic rabbits decreased plasma cholesterol but increased HDL cholesterol, whereas Lipostabil decreased both. These findings suggest that human apoA-I/PC complexes resemble HDL in their behavior more closely than does Lipostabil, and show that both types of liposome undergo modification upon interaction with plasma. It remains to be shown whether they possess any therapeutic potential.
Zhonghua Nei Ke Za Zhi. 1996 May;35(5):313-6.
He Y, Xu N, Liu X.
Abstract: In order to study the effect of oral phospholipid liposomes on regression of atherosclerosis process, serum total cholesterol triglyceride, lipoprotein cholesterol and atherosclerotic lesion on the aorta wall in different groups of 20 New Zealand rabbits were observed. Results showed that phospholipid liposomes could obviously increase high density lipoprorein cholesterol concentration and decrease serum total cholesterol triglyceride and very low density lipoprorein cholesterol concentration. Phospholipid liposomes could also reduce the size of atherosclerotic lesion on the aortic wall. In comparision with the results observed in phospholipid group, there was significant difference (P < 0.05, P < 0.01 or P < 0.001). It suggested that oral phospholipid liposomes could effectively regress atherosclerotic lesion on the arterial wall and regulate serum lipid to reduce cholesterol deposit on the arterial wall in experimental rabbits. It might provide some experimental basis for human being to prevent and treat atherosclerosis.
JPEN J Parenter Enteral Nutr. 1985 Nov-Dec;9(6):716-9.
The effects of oral soybean phospholipid on serum total cholesterol, plasma triglyceride, and serum high-density lipoprotein cholesterol concentrations in hyperlipidemia.
Ovesen L, Ebbesen K, Olesen ES.
Abstract: In a randomized, double-blind, cross-over trial soybean phospholipid and placebo, 18 g daily for 6 wk, were given orally to 20 patients on long-term treatment with standard lipid lowering diets. The effect of this treatment on serum total cholesterol and high-density lipoprotein cholesterol and plasma triglyceride was studied. After 6 wk mean (+/- SE) cholesterol concentration was decreased by 0.54 (+/- 0.19) mmol/liter in phospholipid-treated as compared to placebo-treated patients (p less than 0.02). The decrease in serum cholesterol was significant (p less than 0.02) only in patients assigned to receive phospholipid before placebo. A highly significant increase (p less than 0.001) followed the withdrawal of phospholipid. No effect on triglyceride and high-density lipoprotein cholesterol concentrations was demonstrated.
Clinica Chimica Acta, Volume 383, Issues 1-2, August 2007, Pages 103-109
Whole blood choline and plasma choline in acute coronary syndromes: Prognostic and pathophysiological implications
Oliver Danne, Christian Lueders, Christian Storm, Ulrich Frei, Martin Möckel
Background: Whole blood choline (WBCHO) and plasma choline (PLCHO) concentrations increase rapidly after stimulation of phospholipase D in acute coronary syndromes (ACS). Early risk-stratification was analyzed in 217 patients with suspected ACS and a negative admission troponin T (< 0.03 µg/L).
Methods: WBCHO and PLCHO were measured using high-performance-liquid-chromatography mass spectrometry. Major cardiac events (MACE) were defined as cardiac death/arrest, coronary intervention or myocardial infarction (MI).
Results: WBCHO (≥ 28.2 µmol/L) was predictive for MACE (hazard ratio
2.7; p < 0.001), cardiac death/arrest (HR 4.2; p = 0.015), heart failure (HR 2.8; p = 0.003), coronary intervention (HR 2.1; p = 0.01) and MI (HR 8.4; p = 0.002) after 30 days. PLCHO (≥ 25.0 µmol/L) was predictive for MACE (HR 2.6; p = 0.005), cardiac death/arrest (HR 15.7; p < 0.001), heart failure (HR 6.0; p < 0.001) but not for coronary intervention and MI. WBCHO and PLCHO were predictive for MACE in multivariate analysis (Odds ratio 2.7, p = 0.009 and OR 3.3, p = 0.03) independently of age, gender, prior MI, coronary risk factors and ECG.
Conclusions: WBCHO and PLCHO are significant and independent predictors of major cardiac events in admission troponin T negative acute coronary syndromes. Both are predictive for events related to tissue ischemia and WBCHO is capable of detecting risks associated with coronary plaque instability.
Bidulescu A, Chambless LE, Siega-Riz AM, Zeisel SH, Heiss G. Usual choline and betaine dietary intake and incident coronary heart disease: the Atherosclerosis Risk in Communities (ARIC) study. BMC Cardiovasc Disord. 2007 Jul 13;7:20.
Cho BH, Park JR, Nakamura MT, Odintsov BM, Wallig MA, Chung BH. Synthetic dimyristoylphosphatidylcholine liposomes assimilating into high-density lipoprotein promote regression of atherosclerotic lesions in cholesterol-fed rabbits. Exp Biol Med (Maywood). 2010 Oct;235(10):1194-203.
Chung BH, Franklin F, Liang P, Doran S, Cho BH, Curcio CA. Phosphatidylcholine-rich acceptors, but not native HDL or its apolipoproteins, mobilize cholesterol from cholesterol-rich insoluble components of human atherosclerotic plaques. Biochim Biophys Acta. 2005 Mar 21;1733(1):76-89.
Danne O, Lueders C, Storm C, Frei U, Möckel M. Whole blood choline and plasma choline in acute coronary syndromes: prognostic and pathophysiological implications. Clin Chim Acta. 2007 Aug;383(1-2):103-9.
Gundermann KJ, PhD, MD, Associate Professor at the Institute of Pharmacology and Toxicology, Medical Academy, Szczecin, Poland. “The Essential Phospholipids as a Membrane Therapeutic” 1993.
Hajj Hassan H, Blain S, Boucher B, Denis M, Krimbou L, Genest J. Structural modification of plasma HDL by phospholipids promotes efficient ABCA1-mediated cholesterol release. J Lipid Res. 2005 Jul;46(7):1457-65.
He Y, Xu N, Liu X. . Zhonghua Nei Ke Za Zhi. 1996 May;35(5):313-6.
Koizumi J, Kano M, Okabayashi K, Jadhav A, Thompson GR. Behavior of human apolipoprotein A-I: phospholipid and apoHDL:phospholipid complexes in vitro and after injection into rabbits. J Lipid Res. 1988 Nov;29(11):1405-15.
Navab M, Hama S, Hough G, Fogelman AM. Oral synthetic phospholipid (DMPC) raises high-density lipoprotein cholesterol levels, improves high-density lipoprotein function, and markedly reduces atherosclerosis in apolipoprotein E-null mice. Circulation. 2003 Oct 7;108(14):1735-9.
Ovesen L, Ebbesen K, Olesen ES. The effects of oral soybean phospholipid on serum total cholesterol, plasma triglyceride, and serum high-density lipoprotein cholesterol concentrations. JPEN J Parenter Enteral Nutr. 1985 Nov-Dec;9(6):716-9.
Wood JL, Allison RG. Effects of consumption of choline and lecithin on neurological and cardiovascular systems. Fed Proc. 1982 Dec;41(14):3015-21.
Yechiel E, Barenholz Y. Relationships between membrane lipid composition and biological properties of rat myocytes. Effect of aging and manipulation of lipid composition. J Biol Chem 1985 Aug 5;260(16):9123-31
Yehuda S, Rabinovitz S, Mostofsky DI. Modulation of learning and neuronal membrane composition in the rat by essential fatty acid preparation: time course analysis. Neurochem Res. 1998 May;23(5):627-34