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https://www.readbyqxmd.com/read/28163304/predominant-contribution-of-dgk%C3%AE-over-dgk%C3%AE-in-the-control-of-pkc-pdk-1-regulated-functions-in-t-cells
#1
A Ávila-Flores, J Arranz-Nicolás, E Andrada, D Soutar, I Mérida
Diacylglycerol kinase (DGK)-mediated consumption of the diacylglycerol (DAG) generated in response to antigen recognition is an important mechanism to limit T cell function. Targeting DGK activity presents new opportunities for therapeutic manipulation of the immune response, but assessment of individual DGK functions is complex. T cells express two DGK isoforms, DGKα and DGKζ, and there are no isoform-specific inhibitors. Here we used siRNA-mediated gene silencing in human T cells and DGKα- and DGKζ-deficient mice to define DGK isoform-specific regulation of key signaling pathways during T cell activation...
February 6, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28123081/histone-deacetylase-inhibitors-protect-against-pyruvate-dehydrogenase-dysfunction-in-huntington-s-disease
#2
Luana Naia, Teresa Cunha-Oliveira, Joana Rodrigues, Tatiana R Rosenstock, Ana Oliveira, Márcio Ribeiro, Catarina Carmo, Sofia I Oliveira-Sousa, Ana I Duarte, Michael R Hayden, A Cristina Rego
: Transcriptional deregulation and changes in mitochondrial bioenergetics, including pyruvate dehydrogenase (PDH) dysfunction, have been described in Huntington's disease (HD). We previously showed that histone deacetylase inhibitors (HDACi), trichostatin A and sodium butyrate (SB), ameliorate mitochondrial function in cells expressing mutant huntingtin. In this work we investigated the effect of HDACi on regulation of PDH activity in striatal cells derived from HD knock-in mice and YAC128 mice...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28109078/3-phosphoinositide-dependent-protein-kinase-1-pdk-1-promotes-migration-and-invasion-in-gastric-cancer-cells-through-activating-the-nf-%C3%AE%C2%BAb-pathway
#3
Ning Wu, Changyu He, Bohui Zhu, Jinling Jiang, Yiwen Chen, Tao Ma
Gastric cancer (GC) is one of the most common cancers and the second leading cause of cancer deaths in the world. Manyfactors were reported involving the progression and development of GC. In this study, we aimed to investigate the correlation of 3-phosphoinositide dependent protein kinase 1 (PDK-1) with cell viability, cell migration, and cell invasion of GC. The expression of PDK-1 was measured in different GC cell lines. Thereafter, the expression of PDK-1 was interfered by small hairpin RNA (shRNA) and then incubated with or without the inhibitor of NF-κB pyrrolidine dithiocarbamate (PDTC)...
January 20, 2017: Oncology Research
https://www.readbyqxmd.com/read/28018235/modulation-of-muscle-fiber-compositions-in-response-to-hypoxia-via-pyruvate-dehydrogenase-kinase-1
#4
Daniel D Nguyen, Gyuyoup Kim, Eung-Kwon Pae
Muscle fiber-type changes in hypoxic conditions in accordance with pyruvate dehydrogenase kinase (Pdk)-1 and hypoxia inducible factor (Hif)-1α were investigated in rats. Hif-1α and its down-stream molecule Pdk-1 are well known for readily response to hypoxia. We questioned their roles in relation to changes in myosin heavy chain (MyHC) composition in skeletal muscles. We hypothesize that the level of Pdk-1 with respect to the level of Hif-1α determines MyHC composition of the muscle in rats in hypoxia. Young male rats were housed in a chamber maintained at 11...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27854075/benzimidazole-derivative-m084-extends-the-lifespan-of-caenorhabditis-elegans-in-a-daf-16-foxo-dependent-way
#5
Ai-Jun Ding, Gui-Sheng Wu, Bin Tang, Xuechuan Hong, Michael X Zhu, Huai-Rong Luo
With the growth of aging population, there is increasing demand to develop strategy to improve the aging process and aging-related diseases. Benzimidazole and its derivatives are crucial heterocyclic backbone of many drugs and compounds with diverse therapeutic applications, including alleviation of aging-related diseases. Here, we investigate if the benzimidazole derivative n-butyl-[1H]-benzimidazol-2-amine (M084), a novel inhibitor of TRPC4 and TRPC5 channels and antidepressant, could affect the lifespan of Caenorhabditis elegans (C...
February 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27795296/phd2-is-a-regulator-for-glycolytic-reprogramming-in-macrophages
#6
Annemarie Guentsch, Angelika Beneke, Lija Swain, Katja Farhat, Shunmugam Nagarajan, Ben Wielockx, Kaamini Raithatha, Jan Dudek, Peter Rehling, Anke Zieseniss, Aline Jatho, Mei Chong, Celio X C Santos, Ajay M Shah, Dörthe M Katschinski
The prolyl-4-hydroxylase domain (PHD) enzymes are regarded as the molecular oxygen sensors. There is an interplay between oxygen availability and cellular metabolism, which in turn has significant effects on the functionality of innate immune cells, such as macrophages. However, if and how PHD enzymes affect macrophage metabolism are enigmatic. We hypothesized that macrophage metabolism and function can be controlled via manipulation of PHD2. We characterized the metabolic phenotypes of PHD2-deficient RAW cells and primary PHD2 knockout bone marrow-derived macrophages (BMDM)...
January 1, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/27432037/time-dependent-ppar%C3%AE-modulation-of-hif-1%C3%AE-signaling-in-hypoxic-pulmonary-artery-smooth-muscle-cells
#7
Justine I Blum, Kaiser M Bijli, Tamara C Murphy, Jennifer M Kleinhenz, C Michael Hart
BACKGROUND: Pathogenesis of pulmonary hypertension is complex and involves activation of the transcription factor, hypoxia-inducible factor-1 (HIF-1) that shifts cellular metabolism from aerobic respiration to glycolysis, in part, by increasing the expression of its downstream target pyruvate dehydrogenase kinase-1 (PDK-1), thereby promoting a proliferative, apoptosis-resistant phenotype in pulmonary vascular cells. Activation of the nuclear hormone transcription factor, peroxisome proliferator-activated receptor gamma (PPARγ), attenuates pulmonary hypertension and pulmonary artery smooth muscle cell (PASMC) proliferation...
July 2016: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/27378235/chlorogenic-acid-extends-the-lifespan-of-caenorhabditis-elegans-via-insulin-igf-1-signaling-pathway
#8
Shan-Qing Zheng, Xiao-Bing Huang, Ti-Kun Xing, Ai-Jun Ding, Gui-Sheng Wu, Huai-Rong Luo
Coffee and tea, two of the most popular drinks around the world, share many in common from chemical components to beneficial effects on human health. One of their shared components, the polyphenols, most notably chlorogenic acid (CGA), was supposed to account for many of the beneficial effects on ameliorating diseases occurred accompanying people aging, such as the antioxidant effect and against diabetes and cardiovascular disease. CGA is also present in many traditional Chinese medicines. However, the mechanism of these effects was vague...
July 4, 2016: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/27274101/sirna-induced-silencing-of-hypoxia-inducible-factor-3%C3%AE-hif3%C3%AE-increases-endurance-capacity-in-rats
#9
S Drozdovska, B Gavenauskas, T Drevytska, V Nosar, V Nagibin, I Mankovska, V Dosenko
Molecular mechanisms of adaptation to exercise despite a large number of studies remain unclear. One of the crucial factors in this process is hypoxia inducible factor (HIF) that regulates transcription of many target genes encoding proteins that are implicated in molecular adaptation to hypoxia. Experiments were conducted on 24 adult male Fisher rats. Real-time PCR analysis was performed for quantitative evaluation of Hif3α, Igf1, Glut-4 and Pdk-1 in m. gastrocnemius, m. soleus, in lung and heart tissues...
June 2016: Biology of Sport
https://www.readbyqxmd.com/read/27264671/dynamic-contrast-enhanced-mri-assessing-the-antiangiogenic-effect-of-silencing-hif-1%C3%AE-with-targeted-multifunctional-eco-sirna-nanoparticles
#10
Anthony S Malamas, Erlei Jin, Maneesh Gujrati, Zheng-Rong Lu
Stabilization of hypoxia inducible factor 1α (HIF-1α), a biomarker of hypoxia, in hypoxic tumors mediates a variety of downstream genes promoting tumor angiogenesis and cancer cell survival as well as invasion, and compromising therapeutic outcome. In this study, dynamic contrast enhanced MRI (DCE-MRI) with a biodegradable macromolecular MRI contrast agent was used to noninvasively assess the antiangiogenic effect of RGD-targeted multifunctional lipid ECO/siHIF-1α nanoparticles in a mouse HT29 colon cancer model...
July 5, 2016: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/26924725/a-high-fat-diet-induces-sex-specific-differences-in-hepatic-lipid-metabolism-and-nitrite-nitrate-in-rats
#11
Julijana Stanimirovic, Milan Obradovic, Aleksandra Jovanovic, Emina Sudar-Milovanovic, Sonja Zafirovic, Samantha J Pitt, Alan J Stewart, Esma R Isenovic
Men and women differ substantially with regard to the severity of insulin resistance (IR) but the underlying mechanism(s) of how this occurs is poorly characterized. We investigated whether a high fat (HF) diet resulted in sex-specific differences in nitrite/nitrate production and lipid metabolism and whether these variances may contribute to altered obesity-induced IR. Male and female Wistar rats were fed a standard laboratory diet or a HF diet for 10 weeks. The level of plasma nitrite/nitrate, as well as free fatty acid (FFA), in both plasma and liver lysates were assessed...
April 1, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/26845849/-doxorubicin-induced-alterations-in-pro-and-antioxidant-balance-and-their-correction-by-curcumin-in-the-neonatal-rat-cardiomyocytes-culture
#12
O O Linnik, T I Drevytska, O O Gonchar, S A Chornyy, O M Kovalyov, I M Mankovska
It was studied the effect of doxorubicin on the HIF system and the pro-antioxidant balance of neonatal cardiomyocytes as well as the possibility of the oxidative stress correcting using curcumin. It has been revealed that the expression of mRNA HIF-1α using doxorubicin at a dose of 0.5 μM was 2.9 ± 0.8 cu, so it decreased by 20% compared to control--3.6 ± 0.7 cu (P < 0.05). The level of expression of the HIF target gene PDK-1 also significantly decreased (4 times). During the incubation with doxorubicin, the number of live cells decreased by 50...
2015: Fiziolohichnyĭ Zhurnal
https://www.readbyqxmd.com/read/26842781/molecular-characterization-of-the-haemonchus-contortus-phosphoinositide-dependent-protein-kinase-1-gene-hc-pdk-1
#13
Fa-Cai Li, Robin B Gasser, James B Lok, Pasi K Korhonen, Li He, Wen-Da Di, Fang-Yuan Yin, Rui Zhou, Yan-Qin Zhou, Jun-Long Zhao, Min Hu
BACKGROUND: Phosphoinositide-dependent protein kinase-1 (PDK-1), which functions downstream of phosphoinositide 3-kinase (AGE-1) and activates protein kinases of the AGC family, plays critical roles in regulating biology processes, such as metabolism, growth, development and survival. In the free-living nematode Caenorhabditis elegans, PDK-1 is a key component of the insulin-like signalling pathway, regulating the entry into and exit from dauer (arrested development). Although it is proposed that similar molecular mechanisms control the transition from the free-living to the parasitic stages of nematodes, nothing is known about PDK-1 in Haemonchus contortus, a socioeconomically important gastric nematode of ruminants...
February 3, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/26715102/hypoglycemic-activities-of-lyophilized-powder-of-gynura-divaricata-by-improving-antioxidant-potential-and-insulin-signaling-in-type-2-diabetic-mice
#14
Bing-Qing Xu, Ping Yang, Yu-Qing Zhang
BACKGROUND: Diabetes mellitus is a serious disease affecting about 5% of people worldwide. Although several studies have indicated hypoglycemic activities of Gynura divaricata (GD), the mechanisms by which GD improves the symptoms of diabetes remain unclear. OBJECTIVE: The aim of this study was to investigate the potential hypoglycemic effects of GD. DESIGN: The leaves and stems of GD were prepared and lyophilized into a powder, which was added to the diet of mice with type 2 diabetes induced by a high-fat diet in combination with streptozotocin for 4 weeks...
2015: Food & Nutrition Research
https://www.readbyqxmd.com/read/26631961/ndrg2-promoted-secreted-mir-375-in-microvesicles-shed-from-m1-microglia-which-induced-neuron-damage
#15
Li-li Tang, Yuan-bo Wu, Chuan-qin Fang, Ping Qu, Zong-liang Gao
BACKGROUND: Microglia microvesicles (MVs) has shown to have significant biological functions under normal conditions. A diversity of miRNAs is involved in neuronal development, survival, function, and plasticity, but the exact functional role of NDRG2 and secreted miR-375 in MVs in neuron damage is poorly understood. We investigated the effect of NDRG2 and secreted miR-375 in MVs shed from M1 microglia on neuron damage. METHODS: Expression of Nos2, Arg-1, miR-375, syntaxin-1A, NDRG2 and Pdk 1 were evaluated using RT-PCR or western blotting...
January 15, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/26555156/marcksl1-exhibits-anti-angiogenic-effects-through-suppression-of-vegfr-2-dependent-akt-pdk-1-mtor-phosphorylation
#16
Boh-Ram Kim, Seung-Hoon Lee, Mi-Sun Park, Seung-Hee Seo, Young-Min Park, Young-Joo Kwon, Seung-Bae Rho
Myristoylated alanine-rich C kinase substrate-like 1 (MARCKSL1) plays a pivotal role in the regulation of apoptosis and has been shown to maintain antitumor and metastasis-suppressive properties. In the present study, we examined the effects of MARCKSL1 as a novel anti-angiogenic agent on the inhibition of angiogenesis-mediated cell migration. MARCKSL1 also reduced vascular endothelial growth factor (VEGF)-induced human umbilical vein endothelial cell (HUVEC) proliferation, as well as capillary-like tubular structure formation in vitro...
February 2016: Oncology Reports
https://www.readbyqxmd.com/read/26487493/helicobacter-pylori-modulates-host-cell-survival-regulation-through-the-serine-threonine-kinase-3-phosphoinositide-dependent-kinase-1-pdk-1
#17
Charles C King, Marygorret Obonyo
BACKGROUND: Helicobacter pylori (H. pylori) infection affects cell survival signaling pathways including cell apoptosis and proliferation, which are considered risk factors for the development of gastric cancer when unregulated. In the present study, we investigated the effect of H. pylori infection on the phosphorylation state of 3-phosphoinositide-dependent kinase-1 (PDK-1), a master kinase that regulates phosphorylation of Akt (also known as protein kinase B, PKB) and cell survival...
October 21, 2015: BMC Microbiology
https://www.readbyqxmd.com/read/26439504/clinical-implication-of-serine-metabolism-associated-enzymes-in-colon-cancer
#18
COMPARATIVE STUDY
Shinkyo Yoon, Jong Gwang Kim, An Na Seo, Soo Yeun Park, Hye Jin Kim, Jun Seok Park, Gyu Seog Choi, Ji Yun Jeong, Do Youn Jun, Ghil Suk Yoon, Byung Woog Kang
PURPOSE: Recently, enzymes of the serine synthetic pathway (SSP) have been suggested as key player in the metabolic adaptation of oncogenesis. We assessed the expression of enzymes of the SSP in colonic tumor tissue (TT) and paired normal tissue (pNT) and the prognostic implications. METHODS: From 2006 to 2010, we included 486 patients with colon cancer who underwent curative surgery at Kyungpook National University Hospital. Phosphoglycerate dehydrogenase (PHGDH), pyruvate dehydrogenase kinase (PDK) 1, PDK2, pyruvate kinase M2 (PKM2), and phosphoserine aminotransferase (PSAT) expression were investigated by immunohistochemical staining (IHC) in TT and pNT...
2015: Oncology
https://www.readbyqxmd.com/read/26317299/insulin-signaling-genes-modulate-nicotine-induced-behavioral-responses-in-caenorhabditis-elegans
#19
Seth A Wescott, Elizabeth A Ronan, X Z Shawn Xu
Insulin signaling has been suggested to modulate nicotine dependence, but the underlying genetic evidence has been lacking. Here, we used the nematode, Caenorhabditis elegans, to investigate whether genetic alterations in the insulin signaling pathway affect behavioral responses to nicotine. For this, we challenged drug-naive C. elegans with an acute dose of nicotine (100 μmol/l) while recording changes in their locomotion speed. Although nicotine treatment stimulated locomotion speed in wild-type C. elegans, the same treatment reduced locomotion speed in mutants defective in insulin signaling...
February 2016: Behavioural Pharmacology
https://www.readbyqxmd.com/read/26235810/negative-regulation-of-mir-375-by-interleukin-10-enhances-bone-marrow-derived-progenitor-cell-mediated-myocardial-repair-and-function-after-myocardial-infarction
#20
Venkata Naga Srikanth Garikipati, Prasanna Krishnamurthy, Suresh Kumar Verma, Mohsin Khan, Tatiana Abramova, Alexander R Mackie, Gangjian Qin, Cynthia Benedict, Emily Nickoloff, Jennifer Johnson, Ehre Gao, Douglas W Losordo, Steven R Houser, Walter J Koch, Raj Kishore
Poor survival and function of transplanted cells in ischemic and inflamed myocardium likely compromises the functional benefit of stem cell-based therapies. We have earlier reported that co-administration of interleukin (IL)-10 and BMPAC enhances cell survival and improves left ventricular (LV) functions after acute myocardial infarction (MI) in mice. We hypothesized that IL-10 regulates microRNA-375 (miR-375) signaling in BMPACs to enhance their survival and function in ischemic myocardium after MI and attenuates left ventricular dysfunction after MI...
December 2015: Stem Cells
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