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https://www.readbyqxmd.com/read/28819003/skeletal-muscle-signaling-metabolism-and-performance-during-sprint-exercise-in-severe-acute-hypoxia-after-the-ingestion-of-antioxidants
#1
David Morales-Alamo, Borja Guerra, Jesus Gustavo Ponce-Gonzalez, Amelia Guadalupe-Grau, Alfredo Santana, Marcos Martin-Rincon, Miriam Gelabert-Rebato, Joan Aureli Cadefau, Roser Cussó, Cecilia Dorado, Jose A L Calbet
The aim of this study was to determine reactive oxygen species (ROS) could play a role in blunting Thr(172)-AMPKα phosphorylation in human skeletal muscle after sprint exercise in hypoxia and to elucidate the potential signaling mechanisms responsible for this response. Nine volunteers performed a single 30s sprint (Wingate test) in two occasions while breathing hypoxic gas (PIO2=75 mmHg): one after the ingestion of placebo (P) and another following the intake of antioxidants (A) (α-lipoic acid, vitamin C, and vitamin E), with a randomized double-blind design...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28817111/prospective-cohort-study-for-identification-of-underlying-genetic-causes-in-neonatal-encephalopathy-using-whole-exome-sequencing
#2
Theodora U J Bruun, Caro-Lyne DesRoches, Diane Wilson, Vann Chau, Tadashi Nakagawa, Masahiro Yamasaki, Shinya Hasegawa, Toshiyuki Fukao, Christian Marshall, Saadet Mercimek-Andrews
PurposeNeonatal encephalopathy, which is characterized by a decreased level of consciousness, occurs in 1-7/1,000 live-term births. In more than half of term newborns, there is no identifiable etiological factor. To identify underlying genetic defects, we applied whole-exome sequencing (WES) in term newborns with neonatal encephalopathy as a prospective cohort study.MethodsTerm newborns with neonatal encephalopathy and no history of perinatal asphyxia were included. WES was performed using patient and both parents' DNA...
August 17, 2017: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/28814089/antioxidant-therapy-impresses-in-oxidative-stress-induced-kidney-cells
#3
M Alpay, G Kismali, O Meral, T Sel, R Ozmerdivenli, O Pasin
INTRODUCTION:   Renal cell cancer (RCC) is not a single entity, but consists of different types of tumors derived from various parts of the nephron (epithelium or renal tubules). It is known that cancer initiation and progression is related to the balance between oxidants and antioxidants directly. Interestingly, advanced stages of cancer such as metastasis, angiogenesis are associated with cell oxidative capacity. Familiar antioxidative substances such as carotenes and vitamin C inhibit oxidation of other molecules during carcinogenesis...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/28803783/impact-of-mutations-within-the-fe-s-cluster-or-the-lipoic-acid-biosynthesis-pathways-on-mitochondrial-protein-expression-profiles-in-fibroblasts-from-patients
#4
E Lebigot, P Gaignard, I Dorboz, A Slama, M Rio, P de Lonlay, B Héron, F Sabourdy, O Boespflug-Tanguy, A Cardoso, F Habarou, C Ottolenghi, P Thérond, C Bouton, M P Golinelli-Cohen, A Boutron
Lipoic acid (LA) is the cofactor of the E2 subunit of mitochondrial ketoacid dehydrogenases and plays a major role in oxidative decarboxylation. De novo LA biosynthesis is dependent on LIAS activity together with LIPT1 and LIPT2. LIAS is an iron‑sulfur (Fe-S) cluster-containing mitochondrial protein, like mitochondrial aconitase (mt-aco) and some subunits of respiratory chain (RC) complexes I, II and III. All of them harbor at least one [Fe-S] cluster and their activity is dependent on the mitochondrial [Fe-S] cluster (ISC) assembly machinery...
August 3, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28772267/alpha-lipoic-acid-alleviates-high-glucose-suppressed-osteogenic-differentiation-of-mc3t3-e1-cells-via-antioxidant-effect-and-pi3k-akt-signaling-pathway
#5
Kai Dong, Pengjie Hao, Sheng Xu, Shutai Liu, Wenjuan Zhou, Xilong Yue, Xiaohui Rausch-Fan, Zhonghao Liu
BACKGROUND/AIMS: Patients with diabetes mellitus have a higher risk of dental implant failure. One major cause is high-glucose induced oxidative stress. Alpha-lipoic acid (ALA), a naturally occurring compound and dietary supplement, has been established as a potent antioxidant that is a strong scavenger of free radicals. However, few studies have yet investigated the effect of ALA on osteogenic differentiation of osteoblasts cultured with high glucose medium. The aim of this study is to investigate the effects of ALA on the osteoblastic differentiation in MC3T3-E1 cells under high glucose condition...
August 3, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28769585/%C3%AE-lipoic-acid-suppresses-neuronal-excitability-and-attenuates-colonic-hypersensitivity-to-colorectal-distention-in-diabetic-rats
#6
Yan Sun, Pan-Pan Yang, Zhen-Yuan Song, Yu Feng, Duan-Min Hu, Ji Hu, Guang-Yin Xu, Hong-Hong Zhang
AIM: Patients with long-standing diabetes often demonstrate intestinal dysfunction, characterized as constipation or colonic hypersensitivity. Our previous studies have demonstrated the roles of voltage-gated sodium channels NaV1.7 and NaV1.8 in dorsal root ganglion (DRG) in colonic hypersensitivity of rats with diabetes. This study was designed to determine roles of antioxidant α-lipoic acid (ALA) on sodium channel activities and colonic hypersensitivity of rats with diabetes. METHODS: Streptozotocin was used to induce diabetes in adult female rats...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28766335/functional-complementation-studies-reveal-different-interaction-partners-of-escherichia-coli-iscs-and-human-nfs1
#7
Martin Bühning, Martin Friemel, Silke Leimkühler
The trafficking and delivery of sulfur to cofactors and nucleosides is a highly regulated and conserved process among all organisms. All sulfur transfer pathways generally have an l-cysteine desulfurase as an initial sulfur-mobilizing enzyme in common, which serves as a sulfur donor for the biosynthesis of sulfur-containing biomolecules like iron-sulfur (Fe-S) clusters, thiamine, biotin, lipoic acid, the molybdenum cofactor (Moco), and thiolated nucleosides in tRNA. The human l-cysteine desulfurase NFS1 and the Escherichia coli homologue IscS share a level of amino acid sequence identity of ∼60%...
August 16, 2017: Biochemistry
https://www.readbyqxmd.com/read/28757203/biallelic-mutations-in-lipt2-cause-a-mitochondrial-lipoylation-defect-associated-with-severe-neonatal-encephalopathy
#8
Florence Habarou, Yamina Hamel, Tobias B Haack, René G Feichtinger, Elise Lebigot, Iris Marquardt, Kanetee Busiah, Cécile Laroche, Marine Madrange, Coraline Grisel, Clément Pontoizeau, Monika Eisermann, Audrey Boutron, Dominique Chrétien, Bernadette Chadefaux-Vekemans, Robert Barouki, Christine Bole-Feysot, Patrick Nitschke, Nicolas Goudin, Nathalie Boddaert, Ivan Nemazanyy, Agnès Delahodde, Stefan Kölker, Richard J Rodenburg, G Christoph Korenke, Thomas Meitinger, Tim M Strom, Holger Prokisch, Agnes Rotig, Chris Ottolenghi, Johannes A Mayr, Pascale de Lonlay
Lipoate serves as a cofactor for the glycine cleavage system (GCS) and four 2-oxoacid dehydrogenases functioning in energy metabolism (α-oxoglutarate dehydrogenase [α-KGDHc] and pyruvate dehydrogenase [PDHc]), or amino acid metabolism (branched-chain oxoacid dehydrogenase, 2-oxoadipate dehydrogenase). Mitochondrial lipoate synthesis involves three enzymatic steps catalyzed sequentially by lipoyl(octanoyl) transferase 2 (LIPT2), lipoic acid synthetase (LIAS), and lipoyltransferase 1 (LIPT1). Mutations in LIAS have been associated with nonketotic hyperglycinemia-like early-onset convulsions and encephalopathy combined with a defect in mitochondrial energy metabolism...
August 3, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28754705/in-vivo-roles-of-fatty-acid-biosynthetic-enzymes-in-biosynthesis-of-biotin-and-%C3%AE-lipoic-acid-in-corynebacterium-glutamicum
#9
Masato Ikeda, Takashi Nagashima, Eri Nakamura, Ryosuke Kato, Masakazu Ohshita, Mikiro Hayashi, Seiki Takeno
For fatty acid biosynthesis, Corynebacterium glutamicum uses two type I fatty acid synthases (FAS-I), FasA and FasB, in addition to acetyl-CoA carboxylase (ACC) consisting of AccBC, AccD1, and AccE. The in vivo roles of the enzymes in supplying precursors for biotin and α-lipoic acid remain unclear. Here, we report genetic evidence demonstrating that the biosynthesis of these cofactors is linked to fatty acid biosynthesis through the FAS-I pathway. For this study, we used wild-type C. glutamicum and its derived biotin-vitamer producer BFI-5, which was engineered to express Escherichia coli bioBF and Bacillus subtilis bioI Disruption of either fasA or fasB in strain BFI-5 led to decreased production of biotin-vitamers, whereas its amplification contributed to increased production, with a larger impact of fasA in both cases...
July 28, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28750338/mos2-la-pei-nanocomposite-carrier-for-real-time-imaging-of-atp-metabolism-in-glioma-stem-cells-co-cultured-with-endothelial-cells-on-a-microfluidic-system
#10
Nan Li, Weifei Zhang, Mashooq Khan, Ling Lin, Jin-Ming Lin
Stimuli-responsive carriers have extensively attracted attention in recent years. However, long-term and real-time tracking ability with stimuli-responsive carrier is still in its infant stage due to the limitations such as, low efficacy, instability and cytotoxicity in a bio-environment. In this work, we developed a reduction-sensitive carrier composed of lipoic acid-modified low molecular weight polyethyleneimine (LA-PEI) and large surface ratio MoS2 nanosheet integrated via disulfide bond to mimic a high molecular weight PEI...
July 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28722258/in-vitro-evaluation-of-chitosan-coated-liposome-containing-both-coenzyme-q10-and-alpha-lipoic-acid-cytotoxicity-antioxidant-activity-and-antimicrobial-activity
#11
Guodong Zhao, Caibiao Hu, Ying Xue
BACKGROUND: Chitosan-coated liposome containing both coenzyme Q10 and alpha-lipoic acid (CCAL) was a novel multifunctional nano delivery system exhibited long-term stability at room temperature and high encapsulation efficiency. Which containing two kinds of antioxidants (coenzyme Q10 and alpha-lipoic acid) and two antibacterial agents (chitosan and alpha-lipoic acid). However, the further biocompatibility, such as cytotoxicity and antioxidant activity, and antimicrobial activity of CCAL, has not been systematically evaluated...
July 19, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28710347/effects-of-lipoic-acid-on-high-fat-diet-induced-alteration-of-synaptic-plasticity-and-brain-glucose-metabolism-a-pet-ct-and-13-c-nmr-study
#12
Zhigang Liu, Ishan Patil, Harsh Sancheti, Fei Yin, Enrique Cadenas
High-fat diet (HFD)-induced obesity is accompanied by insulin resistance and compromised brain synaptic plasticity through the impairment of insulin-sensitive pathways regulating neuronal survival, learning, and memory. Lipoic acid is known to modulate the redox status of the cell and has insulin mimetic effects. This study was aimed at determining the effects of dietary administration of lipoic acid on a HFD-induced obesity model in terms of (a) insulin signaling, (b) brain glucose uptake and neuronal- and astrocytic metabolism, and (c) synaptic plasticity...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28689324/fast-detection-of-listeria-monocytogenes-through-a-nanohybrid-quantum-dot-complex
#13
Wendy Donoso, Ricardo I Castro, Luis Guzmán, Zoraya López-Cabaña, Fabiane M Nachtigall, Leonardo S Santos
Listeria monocytogenes is a recognized foodborne pathogen that causes listeriosis in susceptible consumers. Currently, the detection systems for Listeria in food detect live and dead bacteria, being the viable microorganisms most relevant for their ability to cause sickness in the population at risk. For this reason, a new nanohybrid compound was developed for the optical detection of Listeria that was based on polyamidoamine dendrimers functionalized with an auxotrophic cofactor (lipoic acid), together with the coupling of fluorescent semiconductor crystals (quantum dots)...
July 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28686168/the-analysis-and-assessment-of-the-effect-of-selected-endo-and-exogenous-substances-on-prevention-and-treatment-of-selected-conditions-and-injuries-within-the-musculoskeletal-system
#14
Wiesław E Tomaszewski, Zbigniew Obmiński
The aim of the presented report, prepared based on the results of the newest studies available in the reference sources, is the analysis and assessment of the important endo- and exogenous substances, whose role and significance in prevention and complex treatment of civilization-related diseases (including the pathological conditions and injuries of the musculoskeletal system) can be essential and significantly contribute to the improvement of the efficacy of the accepted treatment approach. Three substances, namely a-lipoic acid, y-linolenic acid and a-linoleic acid were subject to a detailed analysis and assessment...
April 12, 2017: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28680918/lipoic-acid-pharmacokinetics-at-baseline-and-1-year-in-secondary-progressive-ms
#15
Frank Bittner, Charles Murchison, Dennis Koop, Dennis Bourdette, Rebecca Spain
No abstract text is available yet for this article.
September 2017: Neurology® Neuroimmunology & Neuroinflammation
https://www.readbyqxmd.com/read/28680916/lipoic-acid-in-secondary-progressive-ms-a-randomized-controlled-pilot-trial
#16
Rebecca Spain, Katherine Powers, Charles Murchison, Elizabeth Heriza, Kimberly Winges, Vijayshree Yadav, Michelle Cameron, Ed Kim, Fay Horak, Jack Simon, Dennis Bourdette
OBJECTIVE: To determine whether lipoic acid (LA), an endogenously produced antioxidant, slowed the whole-brain atrophy rate and was safe in secondary progressive MS (SPMS). METHODS: Patients with SPMS aged 40-70 years enrolled in a single center, 2-year, double-blind, randomized trial of daily oral 1,200 mg LA vs placebo. Primary outcome was change in annualized percent change brain volume (PCBV). Secondary outcomes were changes in rates of atrophy of segmented brain, spinal cord, and retinal substructures, disability, quality of life, and safety...
September 2017: Neurology® Neuroimmunology & Neuroinflammation
https://www.readbyqxmd.com/read/28677037/suppression-of-a-cancer-stem-like-phenotype-mediated-by-alpha-lipoic-acid-in-human-lung-cancer-cells-through-down-regulation-of-%C3%AE-catenin-and-oct-4
#17
Preeyaporn Plaimee Phiboonchaiyanan, Pithi Chanvorachote
PURPOSE: Cancer stem cells (CSCs) that possess the ability of self-renewal and multi-potency have been shown to drive tumor progression and metastasis. The majority of recent studies has focused on potential molecules targeting CSCs so as to develop novel strategies for efficient cancer treatment or protection. Here, we show how alpha-lipoic acid (LA), an endogenous mitochondrial anti-oxidant, affects the CSC-like phenotypes of human non-small cell lung cancer-derived H23, H292 and H460 cells...
July 4, 2017: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/28676917/biochemical-and-clinical-relevance-of-alpha-lipoic-acid-antioxidant-and-anti-inflammatory-activity-molecular-pathways-and-therapeutic-potential
#18
REVIEW
Daniele Tibullo, Giovanni Li Volti, Cesarina Giallongo, Sonia Grasso, Daniele Tomassoni, Carmelina Daniela Anfuso, Gabriella Lupo, Francesco Amenta, Roberto Avola, Vincenzo Bramanti
BACKGROUND: The molecular nature of lipoic acid (LA) clarifies its capability of taking part to a variety of biochemical reactions where redox state is meaningful. The pivotal action of LA is the antioxidant activity due to its ability to scavenge and inactivate free radicals. Furthermore, LA has been shown to chelate toxic metals both directly and indirectly by its capability to enhance intracellular glutathione (GSH) levels. This last property is due to its ability to interact with GSH and recycle endogenous GSH...
July 4, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/28675211/mechanistic-insights-into-the-photocatalytic-properties-of-metal-nanocluster-graphene-ensembles-examining-the-role-of-visible-light-in-the-reduction-of-4-nitrophenol
#19
Malamatenia A Koklioti, Theodosis Skaltsas, Yuta Sato, Kazu Suenaga, Anastasios Stergiou, Nikos Tagmatarchis
Metal nanoclusters (MNCs) based on silver and gold, abbreviated as AgNCs and AuNCs, respectively, were synthesized and combined with functionalized graphene, abbreviated as f-G, forming novel MNC/f-G ensembles. The preparation of MNCs/f-G was achieved by employing attractive electrostatic interactions developed between negatively charged MNCs, attributed to the presence of carboxylates due to α-lipoic acid employed as a stabilizer, and positively charged f-G, attributed to the presence of ammonium units as addends...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28666279/sodium-iodate-produces-a-strain-dependent-retinal-oxidative-stress-response-measured-in-vivo-using-quest-mri
#20
Bruce A Berkowitz, Robert H Podolsky, Jacob Lenning, Nikita Khetarpal, Catherine Tran, Johnny Y Wu, Ali M Berri, Kristin Dernay, Fatema Shafie-Khorassani, Robin Roberts
Purpose: We identify noninvasive biomarkers that measure the severity of oxidative stress within retina layers in sodium iodate (SI)-atrophy vulnerable (C57BL/6 [B6]) and SI-atrophy resistant (129S6/SvEvTac [S6]) mice. Methods: At 24 hours after administering systemic SI to B6 and S6 mice we measured: (1) superoxide production in whole retina ex vivo, (2) excessive free radical production in vivo based on layer-specific 1/T1 values before and after α-lipoic acid (ALA) administration while the animal was inside the magnet (QUEnch-assiSTed MRI [QUEST MRI]), and (3) visual performance (optokinetic tracking) ± antioxidants; control mice were similarly assessed...
June 1, 2017: Investigative Ophthalmology & Visual Science
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