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stearoyl desaturase

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https://www.readbyqxmd.com/read/28803985/mir-199a-3p-affects-adipocytes-differentiation-and-fatty-acid-composition-through-targeting-scd
#1
Zhendong Tan, Jingjing Du, Linyuan Shen, Chendong Liu, Jideng Ma, Lin Bai, Yanzhi Jiang, Guoqing Tang, Mingzhou Li, Xuewei Li, Shunhua Zhang, Li Zhu
Body fat mass is closely associated to diseases related to obesity. MicroRNAs (miRNAs, miR) are important regulatory molecules that function as post-transcriptional gene regulators of adipocyte development. In the current study, we revealed that reduced expression of miR-199a-3p in adipose tissue resulting from high fat diet (HFD)-induced obesity in mice. Overexpression of miR-199a-3p promoted adipocyte proliferation by regulating the expression of regulating factors of the cell cycle. Furthermore, miR-199a-3p blunted lipid accumulation in 3T3-L1 adipocytes...
August 10, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28801090/leptin-concentrations-and-scd-1-indices-in-classical-homocystinuria-evidence-for-the-role-of-sulfur-amino-acids-in-the-regulation-of-lipid-metabolism
#2
Soraia Poloni, Poli Mara Spritzer, Roberta H Mendes, Vânia D'almeida, Kamila Castro, Fernanda Sperb-Ludwig, Johanna Kugele, Sara Tucci, Henk J Blom, Ida V D Schwartz
BACKGROUND: We describe body composition, lipid metabolism and Stearoyl-CoA desaturase-1 (SCD-1) indices in patients with classical homocystinuria (HCU). METHODS: Eleven treated HCU patients and 16 healthy controls were included. Body composition and bone mineral density were assessed by dual X-ray absorptiometry. Sulfur-containing amino acids (SAA) and their derivatives (total homocysteine, cysteine, methionine, S-adenosylmethionine, S-adenosylhomocysteine, and glutathione), lipids (free fatty acids, acylcarnitines, triglycerides and lipoproteins), glucose, insulin, leptin, adiponectin, and isoprostanes were measured in plasma...
August 8, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28797843/blockade-of-stearoyl-coa-desaturase-1-activity-reverts-resistance-to-cisplatin-in-lung-cancer-stem-cells
#3
Maria Elena Pisanu, Alessia Noto, Claudia De Vitis, Stefania Morrone, Giosuè Scognamiglio, Gerardo Botti, Federico Venuta, Daniele Diso, Ziga Jakopin, Fabrizio Padula, Alberto Ricci, Salvatore Mariotta, Maria Rosaria Giovagnoli, Enrico Giarnieri, Ivano Amelio, Massimiliano Agostini, Gerry Melino, Gennaro Ciliberto, Rita Mancini
Poor prognosis in lung cancer has been attributed to the presence of lung cancer stem cells (CSCs) which resist chemotherapy and cause disease recurrence. Hence, the strong need to identify mechanisms of chemoresistance and to develop new combination therapies. We have previously shown that Stearoyl-CoA-desaturase 1 (SCD1), the enzyme responsible for the conversion of saturated to monounsaturated fatty acids is upregulated in 3D lung cancer spheroids and is an upstream activator of key proliferation pathways β-catenin and YAP/TAZ...
August 7, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28790196/trif-dependent-toll-like-receptor-signaling-suppresses-scd1-transcription-in-hepatocytes-and-prevents-diet-induced-hepatic-steatosis
#4
Jing Chen, Jin Li, Jensen H C Yiu, Jenny K W Lam, Chi-Ming Wong, Bernhard Dorweiler, Aimin Xu, Connie W Woo
Nonalcoholic fatty liver disease (NAFLD) includes a spectrum of diseases that ranges in severity from hepatic steatosis to steatohepatitis, the latter of which is a major predisposing factor for liver cirrhosis and cancer. Toll-like receptor (TLR) signaling, which is critical for innate immunity, is generally believed to aggravate disease progression by inducing inflammation. Unexpectedly, we found that deficiency in TIR domain-containing adaptor-inducing interferon-β (TRIF), a cytosolic adaptor that transduces some TLR signals, worsened hepatic steatosis induced by a high-fat diet (HFD) and that such exacerbation was independent of myeloid cells...
August 8, 2017: Science Signaling
https://www.readbyqxmd.com/read/28789975/peripheral-neuropeptide-y-differentially-influences-adipogenesis-and-lipolysis-in-chicks-from-lines-selected-for-low-or-high-body-weight
#5
Lingbin Liu, Guoqing Wang, Yang Xiao, Steven L Shipp, Paul B Siegel, Mark A Cline, Elizabeth R Gilbert
Neuropeptide Y (NPY) stimulates appetite and promotes lipid deposition. We demonstrated a differential sensitivity in the food intake response to central NPY in chicks from lines selected for low (LWS) or high (HWS) body weight, but have not reported whether such differences exist in the periphery. At 5days, LWS and HWS chicks were intraperitoneally injected with 0 (vehicle), 60, or 120μg/kg BW NPY and subcutaneous adipose tissue and plasma were collected at 1, 3, 6, 12, and 24h (n=12). NPY injection increased glycerol-3-phosphate dehydrogenase (G3PDH) activity at 1 and 3h and reduced plasma NEFAs at 1 and 12h...
August 5, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28768997/loss-of-stearoyl-coa-desaturase-1-activity-induced-leptin-resistance-in-neuronal-cells
#6
Mina Thon, Toru Hosoi, Chanbora Chea, Koichiro Ozawa
The lack of response to leptin's actions in the brain, "leptin resistance," is one of the main causes of the pathogenesis of obesity. However, although high-fat diets affect sensitivity to leptin, the underlying mechanisms of leptin resistance are still an enigma. Here we examined the effect of excess saturated fatty acids (SFAs) on leptin signaling in human neuronal cells. Palmitate, the principle source of SFAs in diet, induced leptin resistance in a human neuroblastoma cell line stably transfected with the Ob-Rb leptin receptor (SH-SY5Y-ObRb)...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28765876/exogenous-lipids-promote-the-growth-of-breast-cancer-cells-via-cd36
#7
Jing Zhao, Zheng Zhi, Chao Wang, Hanying Xing, Guangyao Song, Xian Yu, Yajun Zhu, Xing Wang, Xuemei Zhang, Yan Di
Cancer cells present sustained de novo fatty acid (FA) synthesis with increased production of saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs). This change in FA metabolism is associated with overexpression of stearoyl-CoA desaturase 1 (SCD1), which catalyses the transformation of SFAs into MUFAs (e.g., oleic acid). In this study, we provide new evidence that SCD1 inhibition leads to the anti-proliferation effect of breast cancer cells through induction of apoptosis, cell cycle arrest and migration prevention...
August 1, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28762586/complete-auxotrophy-for-unsaturated-fatty-acids-requires-deletion-of-two-sets-of-genes-in-mycobacterium-smegmatis
#8
Cecilia B Di Capua, Mariana Doprado, Juan Manuel Belardinelli, Héctor R Morbidoni
The synthesis of unsaturated fatty acids in Mycobacterium smegmatis is poorly characterized. Bioinformatic analysis revealed four putative fatty acid desaturases in its genome, one of which, MSMEG_1886, is highly homologous to desA3, the only palmitoyl/stearoyl desaturase present in the Mycobacterium tuberculosis genome. A MSMEG_1886 deletion mutant was partially auxotrophic for oleic acid and viable at 37°C and 25°C, although with a long lag phase in liquid medium. Fatty acid analysis suggested that MSMEG_1886 is a palmitoyl/stearoyl desaturase, as the synthesis of palmitoleic acid was abrogated, while oleic acid contents dropped by half in the mutant...
August 1, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28759573/alternation-of-plasma-fatty-acids-composition-and-desaturase-activities-in-children-with-liver-steatosis
#9
Man-Chin Hua, Hui-Min Su, Tsung-Chieh Yao, Ming-Ling Kuo, Ming-Wei Lai, Ming-Han Tsai, Jing-Long Huang
OBJECTIVE: The aim of this study was to investigate changes in plasma fatty acids proportions and estimated desaturase activities for variable grading of liver steatosis in children. METHODS: In total, 111 schoolchildren (aged 8-18 years) were included in the analysis from March 2015 to August 2016. Anthropometric evaluation, liver ultrasound examination and scoring for nonalcoholic fatty liver disease (NAFLD score = 0-6), and biochemical and plasma fatty acids analysis were performed...
2017: PloS One
https://www.readbyqxmd.com/read/28740538/linarin-enriched-extract-attenuates-liver-injury-and-inflammation-induced-by-high-fat-high-cholesterol-diet-in-rats
#10
Zhen-Jie Zhuang, Chao-Wen Shan, Bo Li, Min-Xia Pang, Han Wang, Yan Luo, Yin-Lan Liu, Yu Song, Nan-Nan Wang, Su-Hong Chen, Jun-Ping Shi, Gui-Yuan Lv
The aim of this study was to explore the potential beneficial effects of linarin enriched Flos Chrysanthemi extract (Lin-extract) on nonalcoholic steatohepatitis (NASH) induced by high-fat high-cholesterol (HFHC) diet in rats. SD rats received normal diet, HFHC diet, or HFHC diet plus different doses of Lin-extract. The liver content of triglyceride and total cholesterol markedly increased in HFHC diet-fed model rats while middle and high dose of Lin-extract lowered liver cholesterol significantly. The expression of stearoyl-CoA desaturase (SCD1) was upregulated by HFHC diet and further elevated by high dose Lin-extract...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28727056/effects-of-protein-and-fat-concentration-in-coproduct-based-growing-calf-diets-on-adipogenic-and-lipogenic-gene-expression-blood-metabolites-and-carcass-composition
#11
J R Segers, J J Loor, S J Moisá, D Gonzalez, D W Shike
Crossbred calves ( = 30; age = 95 ± 1.7 d; BW = 179 ± 18 kg) were fed 1 of 5 growing diets: 1) corn-based control, 2) low-fat, low-protein coproduct blend, 3) high-fat, low-protein coproduct blend, 4) low-fat, high-protein coproduct blend, and 5) high-fat, high-protein coproduct blend for 112 d (growing phase) followed by a common corn-based finishing diet (additional 112 d; finishing phase). Calves were biopsied at 0, 112, and 224 d for transcriptional analysis via real-time quantitative PCR of 14 genes associated with adipogenesis and lipogenesis within the muscle...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28727022/triennial-growth-and-development-symposium-genetics-and-breeding-for-intramuscular-fat-and-oleic-acid-content-in-pigs
#12
J Estany, R Ros-Freixedes, M Tor, R N Pena
The intramuscular fat (IMF) and oleic acid (OL) content have been favorably related to pork quality and human health. This influences the purchasing behavior of consumers and, therefore, also shifts the attention of breeding companies toward whether these traits are included into the breeding goal of the lines producing for high-valued markets. Because IMF and OL are unfavorably associated with lean content, a key economic trait, the real challenge for the industry is not simply to increase IMF and OL, but rather to come up with the right trade-off between them and lean content...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28727003/triennial-growth-and-development-symposium-intramuscular-fat-deposition-in-ruminants-and-pigs-a-transcriptomics-perspective
#13
B P Dalrymple, B Guo
The genomics era has led to an explosion in the study of gene expression in production animals. Intramuscular fat (IMF) content (both high and low) and composition are major quality attributes of meat, and more than 90 transcriptomic studies of IMF deposition have been undertaken in the ruminants and pigs since 2001, with the majority since 2008. The studies have implicated many genes involved in the control of adipogenesis, lipogenesis, and deposition of IMF, but there is relatively little consistency between the different studies...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28724430/egfr-modulates-monounsaturated-fatty-acid-synthesis-through-phosphorylation-of-scd1-in-lung-cancer
#14
Jiqin Zhang, Fei Song, Xiaojing Zhao, Hua Jiang, Xiuqi Wu, Biao Wang, Min Zhou, Mi Tian, Bizhi Shi, Huamao Wang, Yuanhui Jia, Hai Wang, Xiaorong Pan, Zonghai Li
BACKGROUND: Epidermal growth factor receptor (EGFR), a well-known oncogenic driver, contributes to the initiation and progression of a wide range of cancer types. Aberrant lipid metabolism including highly produced monounsaturated fatty acids (MUFA) is recognized as a hallmark of cancer. However, how EGFR regulates MUFA synthesis in cancer remains elusive. This is the focus of our study. METHODS: The interaction between EGFR and stearoyl-CoA desaturase-1 (SCD1) was detected byco-immunoprecipitation...
July 19, 2017: Molecular Cancer
https://www.readbyqxmd.com/read/28720051/plasma-and-amniotic-fluid-ppar%C3%AE-is-involved-in-the-lipid-metabolism-of-maternal-fetal-interface-cells
#15
Yan Cheng, Shuangping Liu, Ru Lin, Jue Wang, Ting Peng, Qingying Zhang, Haidong Cheng
OBJECTIVES: The aim of this study was at detecting the expression of peroxisome proliferator-activated receptor γ (PPARγ) in patients with gestational diabetes mellitus (GDM) and to investigate whether PPARγ regulates the lipid metabolism of maternal-fetal interface cells. METHODS: We detected the expression of PPARγ in the maternal plasma, fetal plasma and amniotic fluid of two groups of women with GDM or normal pregnancy using ELISA and western blot. Establish the cell models of the indirect coculture model and the separate culture model using BeWo cells and endometrial stromal cells (ESCs)...
July 19, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28710073/zinc-mediates-the-srebp-scd-axis-to-regulate-lipid-metabolism-in-caenorhabditis-elegans
#16
Jing-Jing Zhang, Jun-Jun Hao, Yu-Ru Zhang, Yan-Li Wang, Ming-Yi Li, Hui-Lai Miao, Xiao-Ju Zou, Bin Liang
Maintenance of lipid homeostasis is crucial for cells in response to lipid requirements or surplus. The SREBPs transcription factors play essential roles in regulating lipid metabolism and are associated with many metabolic diseases. However, SREBP regulation of lipid metabolism is still less understood. Here, we show that reduction of SBP-1, the only homologue of SREBPs in C. elegans, surprisingly leads to high level of zinc. On the contrary, zinc reduction by mutation of sur-7, encoding a member of the cation diffusion facilitator (CDF) family, restores the fat accumulation and fatty acid profile of sbp-1(ep79) mutant...
July 14, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28704514/feedback-activation-of-ampk-mediated-autophagy-acceleration-is-a-key-resistance-mechanism-against-scd1-inhibitor-induced-cell-growth-inhibition
#17
Akito Ono, Osamu Sano, Ken-Ichi Kazetani, Takamichi Muraki, Keisuke Imamura, Hiroyuki Sumi, Junji Matsui, Hidehisa Iwata
Elucidating the bioactive compound modes of action is crucial for increasing success rates in drug development. For anticancer drugs, defining effective drug combinations that overcome resistance improves therapeutic efficacy. Herein, by using a biologically annotated compound library, we performed a large-scale combination screening with Stearoyl-CoA desaturase-1 (SCD1) inhibitor, T-3764518, which partially inhibits colorectal cancer cell proliferation. T-3764518 induced phosphorylation and activation of AMPK in HCT-116 cells, which led to blockade of downstream fatty acid synthesis and acceleration of autophagy...
2017: PloS One
https://www.readbyqxmd.com/read/28693951/gene-silencing-of-stearoyl-acp-desaturase-enhances-the-stearic-acid-content-in-chlamydomonas-reinhardtii
#18
L de Jaeger, J Springer, E J H Wolbert, D E Martens, G Eggink, R H Wijffels
In this study, stearoyl-ACP desaturase (SAD), the enzyme that converts stearic acid into oleic acid, is silenced by artificial microRNA in the green microalga Chlamydomonas reinhardtii. Two different constructs, which target different positions on the mRNA of stearoyl-ACP desaturase, were tested. The mRNA levels for SAD were reduced after the silencing construct was induced. In one of the strains, the reduction in SAD mRNA resulted in a doubling of the stearic acid content in triacylglycerol molecules, which shows that stearic acid production in microalgae is possible...
June 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28676973/chronic-consumption-of-fructose-in-combination-with-trans-fatty-acids-but-not-with-saturated-fatty-acids-induces-nonalcoholic-steatohepatitis-with-fibrosis-in-rats
#19
Sugeedha Jeyapal, Uday Kumar Putcha, Venkata Surekha Mullapudi, Sudip Ghosh, Anil Sakamuri, Suryam Reddy Kona, Sai Santosh Vadakattu, Chandana Madakasira, Ahamed Ibrahim
PURPOSE: Consumption of Western diet high in fat and fructose has been attributed to the recent epidemic of nonalcoholic fatty liver disease (NAFLD). However, the impact of specific fatty acids on the progression of NAFLD to nonalcoholic steatohepatitis (NASH) is poorly understood. In the present study, we investigated the chronic effects of consumption of fructose in combination with saturated fatty acids (SFA) or trans fatty acids (TFA) on the development of NAFLD. METHODS: Male Sprague-Dawley rats were randomly assigned to six isocaloric starch/high fructose (44% of calories), high fat (39% calories) diet containing either starch-peanut oil, fructose-peanut oil, fructose-palmolein, fructose-clarified butter, fructose-coconut oil or fructose-partially hydrogenated vegetable oil and fed for 24 weeks...
July 4, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28667176/mir-212-5p-suppresses-lipid-accumulation-by-targeting-fas-and-scd1
#20
Yajie Guo, Junjie Yu, Chunxia Wang, Kai Li, Bin Liu, Ying Du, Fei Xiao, Shanghai Chen, Feifan Guo
MicroRNAs, a class of small non-coding RNAs, are implicated in controlling a variety of biological processes. We have shown that leucine deprivation suppresses lipogenesis by inhibiting fatty acid synthase (FAS) expression in the liver previously; the aim of our current study is to investigate which kind of microRNA is involved in the regulation of FAS expression in response to leucine deprivation. Here, we indicated that microRNA-212-5p specifically binds to mouse FAS 3'UTR and inhibits its activity. Leucine deficiency significantly increased the mRNA levels of miR-212-5p in the livers of mice...
June 30, 2017: Journal of Molecular Endocrinology
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