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https://www.readbyqxmd.com/read/29147025/sphingolipid-metabolism-in-cancer-signalling-and-therapy
#1
REVIEW
Besim Ogretmen
Sphingolipids, including the two central bioactive lipids ceramide and sphingosine-1-phosphate (S1P), have opposing roles in regulating cancer cell death and survival, respectively, and there have been exciting developments in understanding how sphingolipid metabolism and signalling regulate these processes in response to anticancer therapy. Recent studies have provided mechanistic details of the roles of sphingolipids and their downstream targets in the regulation of tumour growth and response to chemotherapy, radiotherapy and/or immunotherapy using innovative molecular, genetic and pharmacological tools to target sphingolipid signalling nodes in cancer cells...
November 17, 2017: Nature Reviews. Cancer
https://www.readbyqxmd.com/read/29143926/prolonging-time-to-flare-in-pediatric-atopic-dermatitis-a-randomized-investigator-blinded-controlled-multicenter-clinical-study-of-a-ceramide-containing-moisturizer
#2
Lin Ma, Ping Li, Jianping Tang, Yifeng Guo, Chunping Shen, Jing Chang, Nabil Kerrouche
INTRODUCTION: Delaying or preventing flares is important in atopic dermatitis (AD) management. The objective of the study was to evaluate whether using a ceramide-containing moisturizer in addition to a body wash during latent AD can delay flares. METHODS: This was a randomized, investigator-blinded, parallel-group, controlled study among Chinese children with a history of mild to moderate AD, within 1 week of successful treatment with a topical corticosteroid...
November 16, 2017: Advances in Therapy
https://www.readbyqxmd.com/read/29143471/ethnic-differences-in-stratum-corneum-functions-between-chinese-and-thai-infants-residing-in-bangkok-thailand
#3
Tsutomu Fujimura, Yuki Miyauchi, Kyoko Shima, Mitsuyuki Hotta, Hisashi Tsujimura, Takashi Kitahara, Yoshinori Takema, Pakhawadee Palungwachira, Diane Laohathai, Jetchawa Chanthothai, Thamthiwat Nararatwanchai
BACKGROUND/OBJECTIVES: Ethnic and racial differences in infant skin have not been well characterized. The purpose of this study was to establish whether there are ethnic differences and similarities in the stratum corneum (SC) functions of Thai and Chinese infants. METHODS: Healthy infants 6 to 24 months of age (N = 60; 30 Thai, 30 Chinese) who resided in Bangkok, Thailand, were enrolled. Transepidermal water loss (TEWL) and SC hydration (capacitance) on the thigh, buttock, and upper arm were measured...
November 15, 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/29143233/etoposide-upregulates-survival-favoring-sphingosine-1-phosphate-in-etoposide-resistant-retinoblastoma-cells
#4
Vinodh Kakkassery, S Skosyrski, A Lüth, B Kleuser, M van der Giet, R Tate, J Reinhard, A Faissner, S C Joachim, N Kociok
Improved knowledge of retinoblastoma chemotherapy resistance is needed to raise treatment efficiency. The objective of this study was to test whether etoposide alters glucosyl-ceramide, ceramide, sphingosine, and sphingosine-1-phosphate (sphingosine-1-P) levels in parental retinoblastoma cells (WERI Rb1) or their etoposide-resistant subclones (WERI EtoR). WERI Rb1 and WERI EtoR were incubated with 400 ng/ml etoposide for 24 h. Levels of glucosyl-ceramides, ceramides, sphingosine, sphingosine-1-P were detected by Q-TOF mass spectrometry...
November 15, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/29142974/profiling-of-plasma-metabolites-suggests-altered-mitochondrial-fuel-usage-and-remodeling-of-sphingolipid-metabolism-in-individuals-with-type%C3%A2-2-diabetes-and-kidney-disease
#5
Jian-Jun Liu, Sujoy Ghosh, Jean-Paul Kovalik, Jianhong Ching, Hyung Won Choi, Subramaniam Tavintharan, Choon Nam Ong, Chee Fang Sum, Scott A Summers, E Shyong Tai, Su Chi Lim
Introduction: Pathophysiology of diabetic kidney disease (DKD) is incompletely understood. We aim to elucidate metabolic abnormalities associated with DKD in type 2 diabetes mellitus (T2DM) by targeted plasma metabolomics. Methods: A total of 126 T2DM participants with early DKD (urinary albumin-to-creatinine ratio [ACR] 30-299 mg/g and eGFR ≥ 60 ml/min/1.73 m(2)), 154 overt DKD (ACR ≥ 300 mg/g or eGFR < 60 ml/min/1.73 m(2)), and 129 non-DKD T2DM controls (ACR < 30 mg/g and eGFR ≥ 60 ml/min/1...
May 2017: KI Reports
https://www.readbyqxmd.com/read/29139256/-correlative-analysis-advance-of-chemical-constituents-of-polyporus-umbellatus-and-armillaria-mellea
#6
REVIEW
Jing-Wen Huang, Chang-Jiang-Sheng Lai, Yuan Yuan, Min Zhang, Jun-Hui Zhou, Lu-Qi Huang
Medicinal Polyporus umbellatus is the dry sclerotia of P. umbellatus, with the effect of diuresis; Armillaria mellea is a parasitic fungus which can infect plants up to 300 genera, with sedative, anticonvulsant and some other biological activities. As the medicinal value of P. umbellatus and A. mellea is increasingly wide concerned, the market quantity demanded of them is gradually increased and the demand outstrips the supply. The symbiotic A. mellea and P. umbellatus are both the medicinal and edible fungi with diverse activities, including hypoglycemic action, improve immunity and antitumor and so on...
August 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29138469/adoptive-transfer-of-ceramide-synthase-6-deficient-splenocytes-reduces-the-development-of-colitis
#7
Matthew J Scheffel, Kristi Helke, Ping Lu, Jacob S Bowers, Besim Ogretmen, Elizabeth Garrett-Mayer, Chrystal M Paulos, Christina Voelkel-Johnson
Sphingolipids regulate critical cellular processes including inflammation. Ceramide, which serves a central role in sphingolipid metabolism, is generated by six ceramide synthases (CerS) that differ in substrate specificity. CerS6 preferentially generates C16-ceramide and its mRNA is highly expressed in immune tissues. In this study we analyzed how deficiency of CerS6 impacts on the development of colitis using an adoptive transfer model. Adoptive transfer of CerS6-deficient splenocytes, which have significantly decreased levels of C16-ceramide, showed that CerS6-deficiency protected against the development of colitis...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133526/involvement-of-g%C3%AE-%C3%AE-subunits-of-gi-protein-coupled-with-s1p-receptor-on-multivesicular-endosomes-in-f-actin-formation-and-cargo-sorting-into-exosomes
#8
Taketoshi Kajimoto, Nesma Nabil Ibrahim Mohamed, Shaymaa Mohamed Mohamed Badawy, Shubi Ambwene Matovelo, Mitsuhiro Hirase, Shunsuke Nakamura, Daisuke Yoshida, Taro Okada, Takeshi Ijuin, Shun-Ichi Nakamura
Exosomes play a critical role in cell-to-cell communication by delivering cargo molecules to recipient cells. However, the mechanism underlying the generation of the exosomal multivesicular endosome (MVE) is one of the mysteries in the field of endosome research. Although sphingolipid metabolites such as ceramide and sphingosine 1-phosphate (S1P) are known to play important roles in MVE formation and maturation, the detailed molecular mechanisms are still unclear. Here, we show that Rho family GTPases, including Cdc42 and Rac1, are constitutively activated on exosomal MVEs and are regulated by S1P signaling as measured by fluorescence resonance energy transfer (FRET)-based conformational changes...
November 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29133339/decreased-ceramide-underlies-mitochondrial-dysfunction-in-charcot-marie-tooth-2f
#9
Nicholas U Schwartz, Ryan W Linzer, Jean-Philip Truman, Mikhail Gurevich, Yusuf A Hannun, Can E Senkal, Lina M Obeid
Charcot-Marie-Tooth (CMT) disease is the most commonly inherited neurologic disorder, but its molecular mechanisms remain unclear. One variant of CMT, 2F, is characterized by mutations in heat shock protein 27 (Hsp27). As bioactive sphingolipids have been implicated in neurodegenerative diseases, we sought to determine if their dysregulation is involved in CMT. Here, we show that Hsp27 knockout mice demonstrated decreases in ceramide in peripheral nerve tissue and that the disease-associated Hsp27 S135F mutant demonstrated decreases in mitochondrial ceramide...
November 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29132429/characterization-of-skin-function-associated-with-obesity-and-specific-correlation-to-local-systemic-parameters-in-american-women
#10
Shinobu Mori, Akiko Shiraishi, Karen Epplen, Desiree Butcher, Daiki Murase, Yuka Yasuda, Takatoshi Murase
BACKGROUND: Obesity is considered problematic not only as a major cause of diabetes, hypertension, and dyslipidemia, but also as a risk of intractable dermatosis; however influence of obesity on skin function has not been clarified. To clarify the mechanism of obesity-associated skin disorders, we aimed to characterize the skin function of subjects with obesity, and identify possible influencing factors. METHODS: Complex analyses including instrumental measurement, biochemical and lipidomics were performed for facial skin and physical evaluation in 93 Caucasian women with obesity (OB) and non-obesity (NOB)...
November 13, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29131010/blockade-of-experimental-multiple-sclerosis-by-inhibition-of-the-acid-sphingomyelinase-ceramide-system
#11
Katrin Anne Becker, Ramona Halmer, Laura Davies, Brian D Henry, Regan Ziobro-Henry, Yann Decker, Yang Liu, Erich Gulbins, Klaus Fassbender, Silke Walter
BACKGROUND: Multiple sclerosis (MS) is a severe and common autoimmune disorder of the central nervous system. Despite the availability of several novel treatment options, the disease is still poorly controlled, since the pathophysiological mechanisms are not fully understood. METHODS: We tested the role of the acid sphingomyelinase/ceramide system in a model of MS, i.e. experimental autoimmune encephalomyelitis (EAE). Mice were immunized with myelin-oligodendrocyte glycoprotein and the development of the disease was analyzed by histology, immunological tests and clinical assessment in wildtype and acid sphingomyelinase (Asm)-deficient mice...
November 6, 2017: Neuro-Signals
https://www.readbyqxmd.com/read/29130419/recapitulation-of-native-dermal-tissue-in-a-full-thickness-human-skin-model-using-human-collagens
#12
Arnout Mieremet, Marion Rietveld, Rianne van Dijk, Joke A Bouwstra, Abdoelwaheb El Ghalbzouri
OBJECTIVE: Full thickness skin models are comprised of a three dimensional dermal equivalent based on an animal derived collagen matrix that harbours fibroblasts and an epidermal equivalent formed by keratinocytes. The functionality of both equivalents is influenced by many factors, including extracellular matrix composition and resident cell type. Animal-derived collagens differ in amino acid composition and physico-chemical properties from human collagens. This composition could alter the functionality of the dermal equivalent and epidermal morphogenesis with the barrier formation in full thickness models (FTMs)...
November 12, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29130028/sphingosine-kinases-sphingosine-1-phosphate-signaling-in-hepatic-lipid-metabolism
#13
Eric K Kwong, Xiaojiaoyang Li, Phillip B Hylemon, Huiping Zhou
The ever-increasing prevalence of metabolic diseases such as dyslipidemia and diabetes in the western world continues to be of great public health concern. Biologically active sphingolipids, such as sphingosine 1-phosphate (S1P) and ceramide, are important regulators of lipid metabolism. S1P not only directly functions as an active intracellular mediator, but also activates multiple signaling pathways via five transmembrane G-protein coupled receptors (GPCRs), S1PR1-5. S1P is exclusively formed by sphingosine kinases (SphKs)...
August 2017: Current Pharmacology Reports
https://www.readbyqxmd.com/read/29129753/nitrogen-mustard-induced-corneal-injury-involves-the-sphingomyelin-ceramide-pathway
#14
Georgia Charkoftaki, James Jester, David Thompson, Vasilis Vasiliou
PURPOSE: Nitrogen mustard (NM), which simulates the effects of sulfur mustard (SM), is a potent vesicant known to cause irreversible corneal damage. This study investigates the mechanisms by which NM induces corneal damage by examining the impact of NM exposure on the morphology and lipidome of the cornea. METHODS: Intact ex vivo rabbit eyes were placed in serum-free DMEM organ culture. NM (0, 1, 2.5, 5 or 10 mg/ml) was applied to the central cornea for 5, 10 or 15 min using a 5 mm filter disk and subsequently rinsed with DMEM...
November 9, 2017: Ocular Surface
https://www.readbyqxmd.com/read/29127192/lipotoxic-very-long-chain-ceramides-cause-mitochondrial-dysfunction-oxidative-stress-and-cell-death-in-cardiomyocytes
#15
Brittany A Law, Xianghai Liao, Kelsey S Moore, Abigail Southard, Patrick Roddy, Ruiping Ji, Zdzislaw Sculz, Ala Bielawska, P Christian Schulze, L Ashley Cowart
Accumulating data support a role for bioactive lipids as mediators of lipotixicity in cardiomyocytes. One class of these, the ceramides, constitutes a family of molecules that differ in structure and are synthesized by distinct enzymes, ceramide synthase (CerS)1-CerS6. Data support that specific ceramides and the enzymes that catalyze their formation play distinct roles in cell function. In a mouse model of diabetic cardiomyopathy, sphingolipid profiling revealed increases in not only the CerS5-derived ceramides but also in very long chain (VLC) ceramides derived from CerS2...
November 10, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29126773/clomipramine-counteracts-lipid-raft-disturbance-due-to-short-term-muscle-disuse
#16
Irina G Bryndina, Maria N Shalagina, Alexey V Sekunov, Andrei L Zefirov, Alexey M Petrov
Disuse-induced skeletal muscle dysfunction is a serious consequence of long-term spaceflight, numerous diseases and conditions for which treatment possibilities are still strictly limited. We have previously shown that acute hindlimb suspension (HS)-mediated disuse disrupts membrane lipid rafts in the unloaded muscle. Here, we investigated whether pretreatment of rats with the inhibitor of acid sphingomyelinase, clomipramine (1.25mg/g/day, intramuscularly, for 5days before HS), is able to hinder the loss in lipid raft integrity in response to 12h of HS...
November 7, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29125487/differential-pattern-of-phospholipid-profile%C3%A2-in-the-temporal-cortex-from-e280a-familiar-and-sporadic-alzheimer-s%C3%A2-disease-brains
#17
Javier Gustavo Villamil-Ortiz, Alvaro Barrera-Ocampo, Julián David Arias-Londoño, Andrés Villegas, Francisco Lopera, Gloria Patricia Cardona-Gómez
Lipids are considered important factors in the pathogenesis of Alzheimer's disease (AD). In this study, we realized a comparative analysis of the phospholipid profile and phospholipid composition of the temporal cortex from E280A-familiar AD (FAD), sporadic AD (SAD), and healthy human brains. Findings showed a significant decrease of lysophosphatidylcholine and phosphatidylethanolamine formed by low levels of polyunsaturated fatty acids (20 : 4, 22 : 6) in AD brains. However, phosphatidylethanolamine-ceramide and phosphoglycerol were significantly increased in SAD, conformed by high levels of (18 : 0/18 : 1) and (30/32/36 : 0/1/2), respectively...
November 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29125130/acid-sphingomyelinase-inhibitors-imipramine-and-zoledronic-acid-increase-skeletal-muscle-tissue-sensitivity-to-insulin-action-at-old-age
#18
Loay Kh M Hassouneh, Olga A Timofiychuk, Nataliya A Babenko
Malfunction of skeletal muscles and dysregulated turnover of sphingolipids in the insulin responsive tissues have been determined at old age. Present article investigates the role of acid sphingomyelinase (SMase)-dependent ceramide accumulation in reduction of the skeletal muscle sensitivity to insulin action at old age. The 3-, 12- and 24-month-old Wistar male rats were used in the experiments. The progressive increase of ceramide content and ceramide/sphingomyeline (SM) ratio was determined in the extensor digitorum longus (EDL) muscle during aging of rats...
November 10, 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/29122633/iridoids-and-sfingolipids-from-hedyotis-diffusa
#19
Changfu Wang, Ping Xin, Youzhi Wang, Xuegang Zhou, Donghua Wei, Chengjie Deng, Shiqin Sun
Seven new compounds were isolated from the aerial part of Hedyotis diffusa, including three iridoid glycosides, hedyoiridoidside A - C (1-3), two cerebrosides, hedyocerenoside F (4) and G (5), and two new ceramides, hedyoceramide A (6) and B (7). And six known iridoid glycosides (8-13) were also obtained. Their structures were established by their physico-chemical constants and spectroscopic analysis. The cytotoxicity of all compounds against tumor cell lines of human cervical cancer HeLa, human leukemia HL-60, human lung cancer A459, human hepatoma HepG2, human gastric gland carcinoma BCG-823, human nasopharyngeal cancer CNE-2, human colon cancer HCT15, and human prostate cancer PC-3 were also evaluated in vitro...
November 6, 2017: Fitoterapia
https://www.readbyqxmd.com/read/29121774/sphingolipids-and-redox-signaling-in-renal-regulation-and-chronic-kidney-diseases
#20
Owais M Bhat, Xinxu Yuan, Guangbi Li, RaMi Lee, Pin Lan Li
SIGNIFICANCE: Sphingolipids play critical roles in the membrane biology and intracellular signaling events that influence cellular behavior and function. Our review focuses on the cellular mechanisms and functional relevance of the cross talk between sphingolipids and redox signaling, which may be critically implicated in the pathogenesis of different renal diseases. Recent Advances: Reactive oxygen species (ROS) and sphingolipids can regulate cellular redox homeostasis through the regulation of NADPH oxidase, mitochondrial integrity, nitric oxide synthase (NOS) and antioxidant enzymes...
November 9, 2017: Antioxidants & Redox Signaling
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