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Sphingolipids in cardiovascular diseases and metabolic disorders
Lipids in Health and Disease volume 14, Article number: 55 (2015)
Many investigations suggest the pivotal role of sphingolipids in the pathogenesis of lifestyle diseases such as myocardial infarction, hypertension, stroke, diabetes mellitus type 2 and obesity. Some studies suggest that sphingolipids are important factors in cellular signal transduction. They serve as biologically active components of cell membrane and are involved in many processes such as proliferation, maturation and apoptosis. Recently, ceramide and sphingosine-1-phosphate have become the target of many investigations. Ceramide is generated in three metabolic pathways and many factors induce its production as a cellular stress response. Ceramide has proapoptotic properties and acts as a precursor for many other sphingolipids. Sphingosine-1-phosphate is a ceramide derivative, acting antiapoptotically and mitogenically and it is importantly involved in cardioprotection. Further research on the involvement of sphingolipids in cellular pathophysiology may improve the prevention and therapy of lifestyle diseases.
Many experimental and clinical studies have described the role of sphingolipids in the pathogenesis of lifestyle diseases such as myocardial infarction, hypertension, stroke and diabetes mellitus. They are involved in the regulation of numerous cellular processes, including apoptosis . The aim of this article is to summarize and present the role of selected sphingolipids in cardiovascular diseases and metabolic disorders.
General characteristics of sphingolipids
Sphingolipids – derivatives of amino alcohol sphingosine – are biologically active components of cell membranes. Sphingolipids play an important role in intracellular signal transduction and regulate cellular processes such as proliferation, maturation and apoptosis, and are also involved in cellular stress responses. One of the most important sphingolipids is ceramide (CER), which serves as a precursor for other biologically active sphingolipids, including sphingosine (SPH) and sphingosine-1-phosphate (S1P) [2, 3]. Many factors such as glucocorticosteroids, growth factors, interleukins, interferons, ionizing radiation and several chemotherapeutics induce cellular production of ceramide. There are three metabolic pathways involved in ceramide generation: 1) de novo synthesis in the cytosolic layer of endoplasmic reticulum via serine palmitoyltransferase (SPT); 2) hydrolysis of sphingomyelin via sphingomyelinase; and 3) production of ceramide from sphingosine via sphinganine N-acyltransferase (ceramide synthase) – salvage pathway (Fig. 1) [4–6]. De novo synthesis is the major source of ceramide in cells, although the hydrolysis of sphingomyelin via acid sphingomyelinase (aSMase) generates a large cellular amount of ceramide. There are three types of sphingomyelinases: magnesium-dependent acid sphingomyelinase, magnesium-independent neutral sphingomyelinase and alkaline sphingomyelinase. They differ in the optimum value of pH, molecular mass and reliance on divalent ions [4, 5]. Ceramidase catalyzes the hydrolysis of ceramide and leads to the production of sphingosine and a fatty acid. Sphingosine kinases (sphingosine kinase type 1; SK1 and sphingosine kinase type 2; SK2) may phosphorylate sphingosine to generate sphingosine-1-phosphate (S1P) .
As mentioned above, ceramide is the precursor of S1P, so any alteration of CER levels may increase the level of S1P. The main molecular mechanism of the functioning of sphingolipids is the activation of enzyme proteins, such as Ceramide-Activated Protein Kinase, Ceramide-Activated Protein Phosphatase, Mitogen Activated Protein Kinase, c-Jun-N-Terminal Protein Kinase . CER acts as a second messenger, regulating many different processes such as cell growth, differentiation, senescence, necrosis, proliferation and apoptosis. Ceramide is also involved in regulation of protein kinase C, raf-1, kinase-suppressor of Ras, cellular protease cathepsin D and inhibition of phospholipase D [9, 10]. However, S1P plays a role in proliferation, cell growth, cell survival, cell migration, inflammation, angiogenesis, vasculogenesis and resistance to apoptotic cell death. The effect of S1P is mediated by the S1P receptors connected with different types of G-proteins, which results in activation of intracellular signaling pathways .
Pathophysiological mechanisms of sphingolipids action
Cellular apoptosis and stress responses are largely associated with ceramide. Many factors, including infection with, for example, Pseudomonas aeruginosa, Staphylococcus aureus, Neisseria gonorrhoeae, Rhinovirus, and also UV-light and some chemotherapeutics activate aSMase (Fig. 2). Some of these factors stimulate a translocation of aSMase to the outer leaflet of the cell membrane, leading to ceramide release and the formation of ceramide-enriched membrane domains. These domains serve to cluster membrane receptors to amplify signaling, which is required in the induction of apoptosis . Many studies suggest that the relation between sphingolipids and apoptosis is important in the pathogenesis of many diseases, such as both diabetes mellitus type 1 and 2, stroke and myocardial infarction [6, 12, 13].
The aggregated lipoproteins isolated from human atherosclerotic lesions are enriched with ceramide. Moreover, an animal model of atherosclerosis suggested that treatment with myriocin, which is an inhibitor of SPT, may be associated with a protective lipoprotein profile. Although experimental observations suggest associations between sphingolipids, lipoproteins and atherosclerosis, the exact mechanisms still need to be determined .
The important role of sphingolipids in the pathogenesis of lifestyle diseases may be a result of their influence on the immune system. Experimental studies show the involvement of sphingolipids in trafficking and regulation of processes of immune cells such as T cell apoptosis, modification of Th1 vs Th2 T-cell balance, phagocytosis, inflammation and allergic excitability [15–20]. Some papers also suggest that inflammation may alter sphingolipid metabolism and S1P receptor activity [15, 21].
Sphingolipids and other factors involved in cardiovascular diseases
The renin-angiotensin-aldosterone system plays an important role in vasoconstriction and salt and water retention. It can also cause, in some pathophysiological conditions, vascular hypertrophy and lead to hypertension. Ceramide seems to be responsible for some of these pathophysiological effects. In vitro studies performed on rat pheochromocytoma PC12W cells have shown that activation of angiotensin II type 2 receptors results in elevation of the intracellular CER level and apoptosis. Ceramide may also play a role in angiotensin II type 2 receptor-induced growth inhibition and apoptosis in cardiac and vascular tissues .
The increase in risk of cardiovascular and metabolic diseases has been described in some genetic disorders related to sphingolipid metabolism alterations. The abnormal glycosphingolipids accumulation in many types of tissues, which was observed in patients with Fabry disease probably was one of the causes of cardiovascular complications such as: valvular disease, coronary artery disease leading to myocardial infarction and also sudden cardiac death . In Gaucher disease, in which lysosomal accumulation of glucocerebroside was presented, severe congestive cardiomyopathy and mitral and aortic valves disease were observed . In lipid storage disorders such as Niemann-Pick and Sandhoff diseases and GM1 gangliosidosis, metabolic cardiomyopathy was also diagnosed .
The role of sphingolipids in the cardiovascular system
Sphingolipids are components of the cardiomyocytes’ cell membrane. Some biologically active substances, for example, tumor necrosis factor-α (TNF-α) may induce synthesis of ceramide from sphingomyelin via sphingomyelinase. Ceramide, in turn, may act as a second messenger, promoting the apoptosis of cardiomyocytes [25–28]. On the other hand, sphingosine-1-phosphate is cardioprotective [27, 29, 30].
Sphingolipids in ischemic heart disease
Cordis et al.  observed a significant 50 % decrease in levels of sphingomyelin associated with significantly increased concentrations of ceramide during in vitro reperfusion of cardiomyocytes. Investigations performed in the animal model of myocardial ischemia/reperfusion demonstrated decreased activity of both acidic and neutral sphingomyelinase and significantly increased levels of ceramide .
S1P serum level is a significant predictor of coronary artery disease (CAD) in patients undergoing coronary angiography . Egom et al.  reported significantly increased plasma levels of S1P and SPH in patients 1 and 5 min after percutaneous coronary intervention, most probably resulting from transient ischemia.
Sphingolipids – myocardial infarction
In vitro experiments performed on isolated murine hearts treated with ischemic preconditioning (IPC) revealed significantly increased activity of SK, an elevated level of S1P and a reduction of the infarction area. Dimethylsphingosine, an inhibitor of SK, significantly decreased the cardioprotective effect of IPC .
Experimental myocardial infarction induced in male Wistar rats showed significant alterations of sphingolipid levels in plasma, erythrocytes and platelets after ligation of the left coronary artery. The plasma levels of S1P significantly decreased, but the plasma levels of CER significantly increased at 1 and 6 h after myocardial infarction, but both sphingolipids returned to the control values after 24 h from the cardiac incident . Knapp et al.  observed, in the uninfarcted area of the left ventricle, a significant triple reduction in the S1P level at 1 and 6 h after incident and a further reduction after 24 h. The ceramide level was significantly decreased 6 h after myocardial infarction. The authors suggested that alteration of the S1P/CER ratio may be responsible for apoptosis of the cardiomyocytes from the uninfarcted area of the myocardium.
Analysis of patients with CAD has shown that plasma ceramide levels and SMase activity were elevated in the stable angina pectoris (SAP), unstable angina pectoris (UAP) and acute myocardial infarction (AMI) groups. In the group of patients with UAP, there was a significant increase in SMase activity and ceramide concentration in comparison to the control and SAP groups, although the increased activity of SMase was transient. In the AMI group, the significantly elevated level of ceramide was noted up to 7 days following the cardiac incident in comparison to the control and SAP groups, whereas enhancement in activity of SMase occured only 3 days after infarction. The authors of this study suggest that higher ceramide levels and SMase activity in patients with coronary heart disease may be an important factor in the development of atherosclerosis and changes in the plasma concentration of sphingolipids may indicate their involvement in the molecular mechanism of plaque destabilization .
The plasma concentration of CER in patients with acute myocardial infarction after admission to the intensive heart care unit was not significantly changed when compared to the control group, whereas the concentration of S1P was decreased by a significant 50 % . Another investigation revealed that the plasma level of S1P was significantly decreased in patients admitted to hospital with STEMI (ST-elevation myocardial infarction) and ceramide level was reduced 5 days post-infarct compared to the control group, although the reduction in ceramide level reached statistical significance 30 days following infarction. Two years after the infarction the plasma S1P level almost completely recovered, whereas the decreased ceramide level was maintained. Erythrocytes from STEMI patients showed accumulation of S1P and ceramide during the thirty days following infarction, although only the elevated level of S1P reached statistical significance during the whole time of observation. After two years of observation the concentration of CER and S1P decreased to the control levels, although these findings were not statistically significant .
Sphingolipids in hypertension
In vitro experiments performed on carotid arteries isolated from spontaneously hypertensive rats (SHR) demonstrated significant contraction of vessels after the application of sphingomyelinase or SK inhibitors. This effect was not observed in arteries isolated from normotensive WKY rats . Presumably, ceramide, which causes elevated thromboxane A2 release from the endothelium, contributed to the contraction of the isolated arteries.
S1P triggers both vasoconstriction and vasodilation, depending on the type of activated receptor. S1P triggers endothelial nitric oxide synthase-dependent vasodilation in epinephrine preconstricted mesenteric arterioles from either rats or mice. Many studies have proven that the activation of nitric oxide synthase may be mediated by the S1P1 receptor. S1P induces vasoconstriction in basilar arteries from wild type and S1P2 knockout mice, which presumably results from the activation of S1P3 subtype. In addition, the vasoconstricting activity of S1P was lost in S1P3 knockout animals .
Fryer et al.  observed dose-dependent and sustained elevation in mean arterial blood pressure in Sprague Dawley rats resulting from oral administration of unselective S1P receptor agonist (FTY720). Four weeks of treatment with losartan or hydralazine significantly decreased blood pressure and vascular CER level, with no concomitant reduction of plasma ceramide concentration, suggesting that only vascular CER level is sensitive to antihypertensive therapy . The exact mechanism, in which falling blood pressure leads to the reduction of vascular ceramide levels is currently unknown. Although stimulation of angiotensin II receptor type 2 increases cellular ceramide levels, it does not explain the interaction between losartan, an antagonist of angiotensin II type 1 receptor, and vascular levels of ceramide . A mechanism, which may explain the observed effect of both hydralazine and losartan on the vascular ceramide level, has been proposed by Czarny et al. The authors suggested that neutral SMase in plasma membrane acts as a mechanosensor, whose activity may be enhanced by high shear stress, which results in the generation of ceramide . The link between hypertension and ceramides suggests a novel pathophysiological mechanism leading to endothelial dysfunction and abnormal blood pressure regulation, which needs to be determined. This mechanism can also suggest the target for new drugs modulating the sphingolipid system and metabolism to improve the pharmacological treatment of hypertension .
Spijkers et al. reported that the ceramide level is increased in patients with hypertension and that the concentration of ceramide correlates with the severity of disease .
Sphingolipids in stroke
In vitro experiments on neuroblastoma cells indicated that an elevated ceramide level in neurons during ischemia/reperfusion was responsible for apoptosis, however, a low level was a factor for the survival of the neurons [5, 13, 44].
Sphingolipids are presumably involved in the pathogenesis of stroke. Nakane et al.  observed a significant increase in ceramide level and also a significant decrease in sphingomyelin level in the hippocampus of the gerbil after 30 min and 24 h following 5 min of ischemia. Middle cerebral artery occlusion (MCAO) induced an elevation of ceramide concentration in the rat cerebral cortex [46, 47]. In SHR rats, transient ischemia performed prior to the MCAO (preconditioning) significantly reduced ceramide levels both in ischemic and perifocal areas . In the mouse model of ischemic stroke, attenuation of SMase activity significantly reduced brain tissue injury [48, 49].
Sphingosine-1-phosphate, contrary to ceramide, is neuroprotective during ischemia [50, 51]. In mice with middle cerebral artery thrombosis, the level of S1P significantly decreased 3 days after ischemic stroke and then progressively increased, reaching maximum concentration 14 days after occlusion . Peritoneal application of S1P agonist (FTY720) activated S1P1 receptors in Sprague Dawley rats with MCAO and significantly reduced the area of damaged brain tissue . Presumably S1P regulates prosurvival mechanisms through suppression of proapoptotic factors, including caspase 3, and activation of protein kinase B (Akt) and extracellular regulated-signal kinases (ERKs), both involved in cell survival .
Kubota et al. reported that the neural ceramide level was increased in patients with an acute case of internal carotid artery occlusion. Presumably, this elevation resulted from excessive degradation of ganglioside-sphingolipids, which are present in high concentration in the central nervous system. In cells, gangliosides are localized in the outer leaflets of plasma membranes and cell surface microdomains, participating in cell-cell recognition, adhesion and signal transduction [53, 54].
Sphingolipids in diabetes mellitus
Many in vitro investigations confirm the contribution of sphingolipids to the pathogenesis of diabetes mellitus type 1 and 2. Incubation of β cells isolated from wild type mice in ceramide induced apoptosis . Isolated murine β cells lacking caspase 8 – a crucial substance in death receptor-mediated apoptosis, incubated in ceramide, showed increased viability in comparison to the control β cells, suggesting that ceramide is importantly involved in β cell apoptosis .
Maestre et al.  observed that in the presence of fatty acids (for example, palmitic acid – a substrate for de novo synthesis of ceramide) INS-1 cells (a line of pancreatic β cells) demonstrated increased permeability of the mitochondrial membrane to cytochrome c and Apoptosis Inducing Factor. Moreover, the concentration of proapoptotic protein Bax was also elevated. Birbes et al.  studied the involvement of ceramide in the increase of mitochondrial membrane permeability to cytochrome c using proapoptotic protein Bax in breast cancer cells MCF7. Ceramide presumably induces apoptosis through disruption of electron transport in complex I and III of the mitochondrial respiratory chain and activation of the mitochondrial NADPH oxidase, which contributes to increased synthesis of the Reactive Oxygen Species [6, 59, 60].
In vitro and in vivo experiments suggest the role of ceramide in insulin resistance [61–64]. Ceramide significantly decreased the expression of insulin mRNA in pancreatic β cells isolated from Wistar rats . Interestingly, in mice, the genetic deficiency of ceramide kinase (CERK), phosphorylating CER to ceramide-1-phosphate significantly improved the insulin sensitivity . Intravenous infusion of LDL (Low Density Lipoprotein) – ceramide caused insulin resistance in lean mice with concomitant reduction in skeletal muscles’ glucose uptake .
Oral administration of S1P receptor agonist (FTY720) significantly increased the mass of pancreatic β cells, significantly increased the concentration of insulin in blood and the normalized blood glucose level, with no effect on the cellular insulin sensitivity in db/db mice with genetically determined diabetes mellitus type 2 . Sphingosine kinase knockout mice fed on a high-fat diet presented diabetes, simultaneous significant reduction of pancreatic β cell mass and plasma insulin level, whereas wild type mice developed glucose intolerance, significantly increased mass of pancreatic β cells and hyperinsulinemia .
Sphingolipids are also involved in the development of diabetic nephropathy. Studies performed on mesangial cells isolated from the kidney of diabetic rats have proven that S1P induced mesangial cell proliferation both under normoglycemic and hyperglycemic conditions, and enhanced the expression of fibronectin .
The significant elevation of plasma ceramide levels was observed in patients with diabetes mellitus [62, 63]. The Roux-en-Y bypass gastric surgery significantly decreased the plasma ceramide level in severely obese patients. After 6 months post operation, the reduction in total ceramide level was also significantly correlated with excess weight loss, improvement in insulin sensitivity and decrease in TNF α concentration . The authors suggest that a reduced inflammatory environment resulting from the loss of adipose tissue causing lipotoxicity and cellular dysfunction may explain the observed improvement in insulin sensitivity.
Incubation of human pancreatic β cells with S1P receptor agonist did not have a negative influence on the insulin secretion triggered by glucose administration and did not induce apoptosis .
A decreased plasma level of very long chain ceramides in patients with diabetes type 1 was correlated with progression to macroalbuminuria in comparison to diabetic patients with normoalbuminuria . The authors of the study suggest that ceramides play a regulatory role in pathways, which may lead to a loss of renal function. Ceramides are an integral part of cell membrane structure and they act as signaling molecules. The content of ceramides in kidney cell membranes may be changed by interaction with plasma lipoproteins containing altered ceramide compositions. Changes in cell-lipoprotein interactions may trigger the cell’s signaling pathways altering intracellular sphingolipid metabolism. Many investigations suggest that ceramides are also involved strongly in the pathogenesis of insulin resistance, which together with other metabolic syndrome elements are known to be risk factors of diabetes complications and macrovascular disease in patients with and without type 2 diabetes. Mechanisms leading to the alteration of kidney cell membranes’ ceramide composition and association between plasma lipoproteins and kidney cell sphingolipid metabolism and its pathophysiological implications in patients with diabetes mellitus and albuminuria are yet to be determined .
Sphingolipids are supposed to play an important role in the regulation of many cellular functions. Many studies suggest that interactions between two main sphingolipids, ceramide and sphingosine-1-phosphate are essential for the appropriate functioning of the human body. Any disturbances in the balanced relationship between those two sphingolipids accelerates the induction of apoptosis, a process involved in the pathogenesis of diseases such as myocardial infarction, stroke and diabetes mellitus type 2. Pharmacological modification of sphingolipid metabolism may be very important in the treatment and prevention of lifestyle diseases. It seems that, for example, inhibition of de novo ceramide synthesis may be beneficial to improve myocardial systolic function in ischemic heart disease, but attenuation of CERK can improve the insulin sensitivity.
Potein kinase B
Coronary artery disease
Extracellular regulated-signal kinase
S1P receptor agonist
Low density lipoprotein
Middle cerebral artery occlusion
Spontaneously hypertensive rats
Sphingosine kinase type 1
Sphingosine kinase type 2
(ST-elevation myocardial infarction)
Tumor necrosis factor-α.
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The authors wish to express their gratitude to Marcin Kumosa for the preparation of the illustrations.
The authors declare that they have no competing interests.
SB prepared the manuscript. KC prepared the manuscript and revised for intellectual content. MK revised the manuscript for intellectual content. ACJ revised the manuscript for intellectual content and gave final approval of the version of the article to be published. All authors read and approved the final manuscript.
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Borodzicz, S., Czarzasta, K., Kuch, M. et al. Sphingolipids in cardiovascular diseases and metabolic disorders. Lipids Health Dis 14, 55 (2015) doi:10.1186/s12944-015-0053-y
- Cardiovascular diseases
- Metabolic disorders