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Guerre P, Matard-Mann M, Nyvall Collén P. Targeted sphingolipid analysis in chickens suggests different mechanisms of fumonisin toxicity in kidney, lung, and brain. Food Chem Toxicol 2022; 170:113467. [DOI: 10.1016/j.fct.2022.113467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/16/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022]
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Awapak D, Petchkongkaew A, Sulyok M, Krska R. Co-occurrence and toxicological relevance of secondary metabolites in dairy cow feed from Thailand. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2021; 38:1013-1027. [PMID: 33861173 DOI: 10.1080/19440049.2021.1905186] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The occurrence of secondary metabolites and co-contaminants in dairy cow feed samples (n = 115), concentrate, roughage, and mixed feed, collected from Ratchaburi and Kanjanaburi provinces, Thailand, between August 2018 and March 2019 were investigated using LC-MS/MS based multi-toxin method. A total of 113 metabolites were found in the samples. Fungal metabolites were the predominant compounds, followed by plant metabolites. Among major mycotoxins, zearalenone and fumonisins were most frequently detected in concentrate and mixed feed samples, while deoxynivalenol and aflatoxin B1 were found at the frequency lower than 50%. Other metabolites, produced by Aspergillus, Fusarium, Penicillium, and Alternaria species, occurred in the samples. Flavoglaucin, 3-nitropropionic acid, averufin, and sterigmatocystin were the most prevalent Aspergillus metabolites. Common Fusarium metabolites occurring in the samples included moniliformin, beauvericin, and enniatins. For Penicillium metabolites, mycophenolic acid, questiomycin A, quinolactacin A, oxaline, citrinin, and dihydrocitrinone were frequently detected. The toxic Alternaria metabolites, alternariol, and alternariol monomethyl ether showed the high incidence in the samples. Plant metabolites were commonly found, mainly cyanogenic compounds and isoflavones, from cassava and soybean meal used as feed ingredients. Overall, 96.6% of feed samples contained at least two metabolites, in a range from 2 to 69. According to co-contamination of mycotoxins found in feed samples, zearalenone were mostly found in combination with fumonisin B1, deoxynivalenol, and aflatoxin B1. Fumonisin B1 co-occurred with aflatoxin B1 and deoxynivalenol. The mixtures of deoxynivalenol and aflatoxin B1, and of zearalenone, fumonisin B1 and deoxynivalenol were also found. Due to known individual toxicity of fungal and plant metabolites and possible additive or synergistic toxic effects of multi-mycotoxins, the occurrence of these metabolites and co-contaminants should be monitored continuously to ensure food safety through the dairy supply chain.
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Affiliation(s)
- Darika Awapak
- School of Food Science and Technology, Faculty of Science and Technology, Thammasat University (Rangsit Campus), Khong Luang, Thailand
| | - Awanwee Petchkongkaew
- School of Food Science and Technology, Faculty of Science and Technology, Thammasat University (Rangsit Campus), Khong Luang, Thailand
| | - Michael Sulyok
- Institute of Bioanalytics and Agro-Metabolomics, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences Vienna (BOKU), Tulln, Austria
| | - Rudolf Krska
- Institute of Bioanalytics and Agro-Metabolomics, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences Vienna (BOKU), Tulln, Austria
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Zhang Y, Yu H, Fu S, Tan L, Liu J, Zhou B, Li L, Liu Y, Wang C, Li P, Liu J. Synthesis and Anti-Hepatocarcinoma Effect of Amino Acid Derivatives of Pyxinol and Ocotillol. Molecules 2021; 26:molecules26040780. [PMID: 33546225 PMCID: PMC7913291 DOI: 10.3390/molecules26040780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/25/2021] [Accepted: 01/30/2021] [Indexed: 11/17/2022] Open
Abstract
Aiming at seeking an effective anti-hepatocarcinoma drug with low toxicity, a total of 24 amino acid derivatives (20 new along with 4 known derivatives) of two active ocotillol-type sapogenins (pyxinol and ocotillol) were synthesized. Both in vitro and in vivo anti-hepatocarcinoma effects of derivatives were evaluated. At first, the HepG2 human cancer cell was employed to evaluate the anti-cancer activity. Most of the derivatives showed obvious enhanced activity compared with pyxinol or ocotillol. Among them, compound 2e displayed the most excellent activity with an IC50 value of 11.26 ± 0.43 µM. Next, H22 hepatoma-bearing mice were used to further evaluate the anti-liver cancer activity of compound 2e. It was revealed that the growth of H22 transplanted tumor was significantly inhibited when treated with compound 2e or compound 2e combined with cyclophosphamide (CTX) (p < 0.05, p < 0.01), and the inhibition rates of tumor growth were 35.32% and 55.30%, respectively. More importantly, compound 2e caused limited damage to liver and kidney in contrast with CTX causing significant toxicity. Finally, the latent mechanism of compound 2e was explored by serum and liver metabolomics based on ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS) technology. A total of 21 potential metabolites involved in 8 pathways were identified. These results suggest that compound 2e is a promising agent for anti-hepato-carcinoma, and that it also could be used in combination with CTX to increase efficiency and to reduce toxicity.
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Affiliation(s)
- Ying Zhang
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
- The First Hospital of Jilin University, Changchun 130021, China
| | - Hui Yu
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Shuzheng Fu
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Luying Tan
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Junli Liu
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Baisong Zhou
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Le Li
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Yunhe Liu
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Caixia Wang
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Pingya Li
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
| | - Jinping Liu
- School of Pharmaceutical Sciences, Jilin University, Fujin Road 1266, Changchun 130021, China; (Y.Z.); (H.Y.); (S.F.); (L.T.); (J.L.); (B.Z.); (L.L.); (Y.L.); (C.W.); (P.L.)
- Research Center of Natural Drug, Jilin University, Changchun 130021, China
- Correspondence:
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Chen J, Wei Z, Wang Y, Long M, Wu W, Kuca K. Fumonisin B 1: Mechanisms of toxicity and biological detoxification progress in animals. Food Chem Toxicol 2021; 149:111977. [PMID: 33428988 DOI: 10.1016/j.fct.2021.111977] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 01/03/2021] [Accepted: 01/05/2021] [Indexed: 01/21/2023]
Abstract
Fumonisin B1 (FB1) is a toxic secondary metabolite produced by the Fusarium molds that can contaminate food and feed. It has been found that FB1 can cause systemic toxicity, including neurotoxicity, hepatotoxicity, nephrotoxicity and mammalian cytotoxicity. This review addresses the toxicity studies carried out on FB1 and outlines the probable mechanisms underlying its immunotoxicity, reproductive toxicity, joint toxicity, apoptosis, and autophagy. In the present work, the research progress of FB1 detoxification in recent years is reviewed, which provides reference for controlling and reducing the toxicity of FB1.
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Affiliation(s)
- Jia Chen
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Zhen Wei
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Yan Wang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Miao Long
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Wenda Wu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China; Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003, Hradec Kralove, Czech Republic.
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003, Hradec Kralove, Czech Republic.
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Changes in the Fecal Metabolome Are Associated with Feeding Fiber Not Health Status in Cats with Chronic Kidney Disease. Metabolites 2020; 10:metabo10070281. [PMID: 32660033 PMCID: PMC7407581 DOI: 10.3390/metabo10070281] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/03/2020] [Accepted: 07/03/2020] [Indexed: 11/25/2022] Open
Abstract
The objective was to determine the effects of feeding different fiber sources to cats with chronic kidney disease (CKD) compared with healthy cats (both n = 10) on fecal metabolites. A cross-over within split-plot study design was performed using healthy and CKD cats (IRIS stage 1, 2, and 3). After cats were fed a complete and balanced dry food designed to aid in the management of renal disease for 14 days during a pre-trial period, they were randomly assigned to two fiber treatments for 4 weeks each. The treatment foods were formulated similar to pre-trial food and contained 0.500% betaine, 0.586% oat beta glucan, and either 0.407% short chain fructooligosaccharides (scFOS) fiber or 3.44% apple pomace. Both treatment foods had similar crude fiber (2.0 and 2.1% for scFOS and apple pomace, respectively) whereas soluble fiber was 0.8 and 1.6%, respectively. At baseline, CKD had very little impact on the fecal metabolome. After feeding both fiber sources, some fecal metabolite concentrations were significantly different compared with baseline. Many fecal uremic toxins decreased, although in healthy cats some increased; and some more so when feeding apple pomace compared with scFOS, e.g., hippurate, 4-hydroxyhippurate, and 4-methylcatechol sulfate; the latter was also increased in CKD cats. Changes in secondary bile acid concentrations were more numerous in healthy compared with CKD cats, and cats in both groups had greater increases in some secondary bile acids after consuming apple pomace compared with scFOS, e.g., tauroursodeoxycholate and hyocholate. Although changes associated with feeding fiber were more significant than changes associated with disease status, differential modulation of the gut-kidney axis using dietary fiber may benefit cats.
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Transcriptome study reveals apoptosis of porcine kidney cells induced by fumonisin B1 via TNF signalling pathway. Food Chem Toxicol 2020; 139:111274. [DOI: 10.1016/j.fct.2020.111274] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 02/13/2020] [Accepted: 03/13/2020] [Indexed: 02/06/2023]
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Molecular mechanisms of fumonisin B1-induced toxicities and its applications in the mechanism-based interventions. Toxicon 2019; 167:1-5. [DOI: 10.1016/j.toxicon.2019.06.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 05/30/2019] [Accepted: 06/03/2019] [Indexed: 01/02/2023]
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Yin S, Liu X, Fan L, Hu H. Mechanisms of cell death induction by food-borne mycotoxins. Crit Rev Food Sci Nutr 2017; 58:1406-1417. [DOI: 10.1080/10408398.2016.1260526] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Shutao Yin
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Nutrition and Health, College of Food Science and Nutritional Engineering, China Agricultural University, National Engineering Research Center for Fruit and Vegetable Processing, Beijing, China, Haidian District, Beijing, China
| | - Xiaoyi Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Nutrition and Health, College of Food Science and Nutritional Engineering, China Agricultural University, National Engineering Research Center for Fruit and Vegetable Processing, Beijing, China, Haidian District, Beijing, China
| | - Lihong Fan
- College of Veterinary Medicine, China Agricultural University, Haidian District, Beijing, China
| | - Hongbo Hu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Nutrition and Health, College of Food Science and Nutritional Engineering, China Agricultural University, National Engineering Research Center for Fruit and Vegetable Processing, Beijing, China, Haidian District, Beijing, China
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Role of Sphingolipids in the Pathobiology of Lung Inflammation. Mediators Inflamm 2015; 2015:487508. [PMID: 26770018 PMCID: PMC4681829 DOI: 10.1155/2015/487508] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Revised: 10/24/2015] [Accepted: 10/27/2015] [Indexed: 12/31/2022] Open
Abstract
Sphingolipid bioactivities in the respiratory airways and the roles of the proteins that handle them have been extensively investigated. Gas or inhaled particles or microorganisms come into contact with mucus components, epithelial cells, blood barrier, and immune surveillance within the airways. Lung structure and functionality rely on a complex interplay of polar and hydrophobic structures forming the surfactant layer and governing external-internal exchanges, such as glycerol-phospholipids sphingolipids and proteins. Sphingolipids act as important signaling mediators involved in the control of cell survival and stress response, as well as secreted molecules endowed with inflammation-regulatory activities. Most successful respiratory infection and injuries evolve in the alveolar compartment, the critical lung functional unit involved in gas exchange. Sphingolipid altered metabolism in this compartment is closely related to inflammatory reaction and ceramide increase, in particular, favors the switch to pathological hyperinflammation. This short review explores a few mechanisms underlying sphingolipid involvement in the healthy lung (surfactant production and endothelial barrier maintenance) and in a selection of lung pathologies in which the impact of sphingolipid synthesis and metabolism is most apparent, such as acute lung injury, or chronic pathologies such as cystic fibrosis and chronic obstructive pulmonary disease.
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Loiseau N, Polizzi A, Dupuy A, Therville N, Rakotonirainy M, Loy J, Viadere JL, Cossalter AM, Bailly JD, Puel O, Kolf-Clauw M, Bertrand-Michel J, Levade T, Guillou H, Oswald IP. New insights into the organ-specific adverse effects of fumonisin B1: comparison between lung and liver. Arch Toxicol 2014; 89:1619-29. [PMID: 25155190 DOI: 10.1007/s00204-014-1323-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 07/21/2014] [Indexed: 11/29/2022]
Abstract
Fumonisin B1 (FB1) is a well-known inhibitor of de novo sphingolipid biosynthesis, due to its ability to inhibit ceramide synthases (CerS) activity. In mammals, this toxin triggers broad clinical symptoms with multi-organ dysfunction such as hepatotoxicity or pulmonary edema. The molecular mechanism of CerS inhibition by FB1 remains unknown. Due to the existence of six mammalian CerS isoforms with a tissue-specific expression pattern, we postulated that the organ-specific adverse effects of FB1 might be due to different CerS isoforms. The sphingolipid contents of lung and liver were compared in normal and FB1-exposed piglets (gavage with 1.5 mg FB1/kg body weight daily for 9 days). The effect of the toxin on each CerS was deduced from the analysis of its effects on individual ceramide (Cer) and sphingomyelin (SM) species. As expected, the total Cer content decreased by half in the lungs of FB1-exposed piglets, while in contrast, total Cer increased 3.5-fold in the livers of FB1-exposed animals. Our data also indicated that FB1 is more prone to bind to CerS4 and CerS2 to deplete lung and to enrich liver in d18:1/C20:0 and d18:1/C22:0 ceramides. It also interact with CerS1 to enrich liver in d18:1/C18:0 ceramides. Cer levels were counterbalanced by those of SM. In conclusion, these results demonstrate that the specificity of the effects of FB1 on tissues and organs is due to the effects of the toxin on CerS4, CerS2, and CerS1.
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Affiliation(s)
- Nicolas Loiseau
- INRA, UMR1331 Toxalim, Research Centre in Food Toxicology, 31027, Toulouse, France,
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Longato L, Tong M, Wands JR, de la Monte SM. High fat diet induced hepatic steatosis and insulin resistance: Role of dysregulated ceramide metabolism. Hepatol Res 2012; 42:412-27. [PMID: 22176347 PMCID: PMC4096625 DOI: 10.1111/j.1872-034x.2011.00934.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AIM Non-alcoholic fatty liver disease (NAFLD) is an insulin resistance disease that can progress to cirrhosis and liver failure. We hypothesized that in NAFLD, insulin resistance dysregulates lipid metabolism, increasing production of cytotoxic lipids including ceramides, which exacerbate hepatic insulin resistance and injury. METHODS Long Evans rats were pair-fed low (LFD) or high (HFD) fat diets for 8 weeks. Livers were used to measure lipids, gene expression, insulin receptor binding, integrity of insulin signaling, and pro-inflammatory cytokines. In vitro experiments characterized effects of ceramides on Huh7 cell viability, mitochondrial function, and insulin signaling. RESULTS High fat diet feeding caused NAFLD with peripheral and hepatic insulin resistance, increased hepatic expression of pro-ceramide genes, sphingomyelinase activity, and lipid peroxidation, and increased serum ceramide. Ceramide treatment impaired Huh7 cell viability, mitochondrial function, and insulin signaling. CONCLUSIONS Increased hepatic ceramide generation and release may mediate both hepatic and peripheral insulin resistance in NAFLD.
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Affiliation(s)
- Lisa Longato
- Departments of Medicine, Pathology and Neurology, Divisions of Gastroenterology and Neuropathology, and the Liver Research Center, Rhode Island Hospital and the Warren Alpert Medical School of Brown University, Providence, RI, USA
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Sphinganine-1-phosphate attenuates both hepatic and renal injury induced by hepatic ischemia and reperfusion in mice. Shock 2010; 33:31-42. [PMID: 19752779 DOI: 10.1097/shk.0b013e3181c02c1f] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Hepatic ischemia/reperfusion (I/R) injury is a major complication after liver transplantation, major hepatic resection, or prolonged portal vein occlusion. Furthermore, acute kidney injury is frequent after hepatic I/R and greatly increases postoperative complications. Sphinganine-1-phosphate is a sphingolipid with uncharacterized physiological effects. We serendipitously determined that plasma levels of sphinganine-1-phosphate fell significantly after liver I/R in mice. In this study, we hypothesized that repletion of plasma sphinganine-1-phosphate would protect against liver and kidney injuries after liver I/R. C57BL/6 mice were subjected to 60 min of partial hepatic I/R and treated with either vehicle or with sphinganine-1-phosphate (given immediately before and 2 h after reperfusion). Vehicle-treated mice subjected to liver I/R developed acute liver and kidney injuries with elevated plasma alanine aminotransferase and creatinine 5 and 24 h after liver I/R. However, liver and kidney injuries were significantly attenuated with sphinganine-1-phosphate treatment. Sphinganine-1-phosphate markedly inhibited liver and kidney necrosis and apoptosis 24 h after liver I/R. Moreover, sphinganine-1-phosphate attenuated neutrophil infiltration, reduced plasma IL-6 and TNF-alpha upregulation, and preserved liver and kidney vascular integrity while reducing liver and kidney F-actin degradation after liver I/R. Finally, sphinganine-1-phosphate-mediated hepatic and renal protection was blocked by VPC23019, an antagonist for sphingosine-1-phosphate type 1 receptor. Therefore, sphinganine-1-phosphate improves acute liver and kidney injuries after hepatic I/R via sphingosine-1-phosphate type 1 receptor-mediated inhibition of necrosis and apoptosis and by improving vascular integrity. Harnessing the mechanisms of cytoprotection with sphinganine-1-phosphate activation may lead to new therapies for perioperative hepatic I/R injury and subsequent remote organ injury.
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Berdyshev EV, Gorshkova I, Skobeleva A, Bittman R, Lu X, Dudek SM, Mirzapoiazova T, Garcia JGN, Natarajan V. FTY720 inhibits ceramide synthases and up-regulates dihydrosphingosine 1-phosphate formation in human lung endothelial cells. J Biol Chem 2009; 284:5467-77. [PMID: 19119142 DOI: 10.1074/jbc.m805186200] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Novel immunomodulatory molecule FTY720 is a synthetic analog of myriocin, but unlike myriocin FTY720 does not inhibit serine palmitoyltransferase. Although many of the effects of FTY720 are ascribed to its phosphorylation and subsequent sphingosine 1-phosphate (S1P)-like action through S1P(1,3-5) receptors, studies on modulation of intracellular balance of signaling sphingolipids by FTY720 are limited. In this study, we used stable isotope pulse labeling of human pulmonary artery endothelial cells with l-[U-(13)C, (15)N]serine as well as in vitro enzymatic assays and liquid chromatography-tandem mass spectrometry methodology to characterize FTY720 interference with sphingolipid de novo biosynthesis. In human pulmonary artery endothelial cells, FTY720 inhibited ceramide synthases, resulting in decreased cellular levels of dihydroceramides, ceramides, sphingosine, and S1P but increased levels of dihydrosphingosine and dihydrosphingosine 1-phosphate (DHS1P). The FTY720-induced modulation of sphingolipid de novo biosynthesis was similar to that of fumonisin B1, a classical inhibitor of ceramide synthases, but differed in the efficiency to inhibit biosynthesis of short-chain versus long-chain ceramides. In vitro kinetic studies revealed that FTY720 is a competitive inhibitor of ceramide synthase 2 toward dihydrosphingosine with an apparent K(i) of 2.15 microm. FTY720-induced up-regulation of DHS1P level was mediated by sphingosine kinase (SphK) 1, but not SphK2, as confirmed by experiments using SphK1/2 silencing with small interfering RNA. Our data demonstrate for the first time the ability of FTY720 to inhibit ceramide synthases and modulate the intracellular balance of signaling sphingolipids. These findings open a novel direction for therapeutic applications of FTY720 that focuses on inhibition of ceramide biosynthesis, ceramide-dependent signaling, and the up-regulation of DHS1P generation in cells.
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Affiliation(s)
- Evgeny V Berdyshev
- Department of Medicine, University of Chicago, Chicago, Illinois 60637, USA.
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