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Paula B M Luís, Jos Ruiter, Lodewijk IJlst, Isabel Tavares de Almeida, Marinus Duran, Ronald J A Wanders, Margarida F B Silva
BACKGROUND: Valproic acid (VPA) is an effective antiepileptic drug that may induce progressive microvesicular steatosis. The impairment of mitochondrial function may be an important metabolic effect of VPA treatment with potential adverse consequences. OBJECTIVE: To investigate the influence of VPA on the activity of GTP- and ATP-specific succinate:CoA ligases (G-SUCL and A-SUCL). METHODS: The GTP- and ATP-specific SUCL activities were measured in human fibroblasts in the reverse direction, i...
May 2014: Journal of Inherited Metabolic Disease
Arpád Dobolyi, Elsebet Ostergaard, Attila G Bagó, Tamás Dóczi, Miklós Palkovits, Aniko Gál, Mária J Molnár, Vera Adam-Vizi, Christos Chinopoulos
SUCLA2 encodes the ATP-forming β subunit (A-SUCL-β) of succinyl-CoA ligase, an enzyme of the citric acid cycle. Mutations in SUCLA2 lead to a mitochondrial disorder manifesting as encephalomyopathy with dystonia, deafness and lesions in the basal ganglia. Despite the distinct brain pathology associated with SUCLA2 mutations, the precise localization of SUCLA2 protein has never been investigated. Here, we show that immunoreactivity of A-SUCL-β in surgical human cortical tissue samples was present exclusively in neurons, identified by their morphology and visualized by double labeling with a fluorescent Nissl dye...
January 2015: Brain Structure & Function
Osamu Sakamoto, Toshihiro Ohura, Kei Murayama, Akira Ohtake, Hiroko Harashima, Daiki Abukawa, Junji Takeyama, Kazuhiro Haginoya, Shigeaki Miyabayashi, Shigeo Kure
BACKGROUND: Succinyl-coenzyme A ligase (SUCL) is a mitochondrial enzyme that catalyses the reversible conversion of succinyl-coenzyme A to succinate. SUCL consists of an α subunit, encoded by SUCLG1, and a β subunit, encoded by either SUCLA2 or SUCLG2. Recently, mutations in SUCLG1 or SUCLA2 have been identified in patients with infantile lactic acidosis showing elevated urinary excretion of methylmalonate, mitochondrial respiratory chain (MRC) deficiency, and mitochondrial DNA depletion...
December 2011: Pediatrics International: Official Journal of the Japan Pediatric Society
Bi-ling Wen, Chun-sheng Jia, Wei-hong Liu, Yong-qing Yang, Ling-ling Wang, Hua-yuan Yang, Xiao-dong Wu, Xue-yong Shen, Ping Xu, Jing-shen Zhao, Jun-ling Liu, Kai Cheng, Wen-zeng Zhu
Through combing the academic development of acupuncture in recent ten years, objectively reflects the real development status of acupuncture subject on these aspects sucl as basis, clinic, equipment, teaching and standardization, etc., shows the scientific and technological achievements and the highlights of the acupuncture academic development, analyzes the bottleneck and dilemma of the acupuncture academic development. It is indicated that there are several problems existed in acupuncture researche at present, such as the scale and the input of the acupuncture theory research are not enough, the basic research and clinical application is disjointed, the correlation between the acupoints and viscera need more systematic and further researches, the design level of clinical research on acupoints' main indications should be improved...
December 2009: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
Jun He, Shahab A Shamsi
Enantiomeric separation and detection of 1,1'-binaphthyl-2,2'-diamine (BNA) has been successfully optimized by MEKC-ESI-MS using a polymeric surfactant polysodium N-undecenoxycarbonyl-L-leucinate (poly-L-SUCL) as a pseudostationary phase. In the first step, MEKC conditions were optimized by a five-factor three-level central composite design (CCD) of experiment. All five MEKC factors (buffer pH, percentage of ACN in the running buffer, concentration of surfactant, concentration of ammonium acetate (NH4OAc), and voltage) were found significant to the responses (measured as the chiral resolution and analysis time)...
June 2009: Journal of Separation Science
Jun He, Shahab A Shamsi
A mixture of two molecular micelles polysodium N-undecenoxy carbonyl-L-leucinate, (poly-L-SUCL) and polysodium N-undecanoyl leucylvalinate, (poly-L-SULV) was utilized in micellar electrokinetic chromatography-electrospray ionization-mass spectrometry (MEKC-ESI-MS) to simultaneously separate and detect enantiomers of binaphthyl derivatives. Separation parameters such as background buffer composition, voltage, temperature, and nebulizer pressure were optimized using a multivariate central composite design (CCD)...
January 30, 2009: Journal of Chromatography. A
B Fowler, J V Leonard, M R Baumgartner
Several mutant genetic classes that cause isolated methylmalonic acidurias (MMAuria) are known based on biochemical, enzymatic and genetic complementation analysis. The mut(0) and mut(-) defects result from deficiency of MMCoA mutase apoenzyme which requires adenosyl-cobalamin (Ado-Cbl) as coenzyme. The cblA, cblB and the variant 2 form of cblD complementation groups are linked to processes unique to Ado-Cbl synthesis. The cblC, cblD and cblF complementation groups are associated with defective methyl-cobalamin synthesis as well...
June 2008: Journal of Inherited Metabolic Disease
Elsebet Ostergaard, Ernst Christensen, Elisabeth Kristensen, Bodil Mogensen, Morten Duno, Eric A Shoubridge, Flemming Wibrand
Fatal infantile lactic acidosis is a severe metabolic disorder characterized by the onset of lactic acidosis within the 1st d of life and early death. We found a combined respiratory-chain enzyme deficiency associated with mitochondrial DNA (mtDNA) depletion in a small consanguineous family with this disorder. To identify the disease-causing gene, we performed single-nucleotide polymorphism homozygosity mapping and found homozygous regions on four chromosomes. DNA sequencing revealed a homozygous 2-bp deletion in SUCLG1, a gene that encodes the alpha subunit of the Krebs-cycle enzyme succinate-coenzyme A ligase (SUCL)...
August 2007: American Journal of Human Genetics
Syed Asad Ali Rizvi, Shahab A Shamsi
In this work, six amino acid derived (L-leucinol, L-leucine, L-isoleucinol, L-isoleucine, L-valinol, and L-valine) polymeric chiral surfactants with carboxylate and sulfate head groups that were recently synthesized in our laboratory [30, 33, 35] are compared for the simultaneous enantioseparation of several groups of structurally similar analytes under neutral and basic pH conditions. The physicochemical properties of the monomers and polymers of both classes of sulfated and carboxylated surfactants are compared...
June 2007: Electrophoresis
Jingguo Hou, Jie Zheng, Shahab A Shamsi
Chiral MEKC-MS method was utilized for separation, identification, and quantitation of ten enantiomers of ephedrine and related compounds. Enantioselective separations of all ephedrine alkaloids were accomplished through a combination of polysodium N-undecenoxycarbonyl-L-leucinate (poly-L-SUCL) with 30% v/v ACN. Interestingly, the more hydrophilic stereoisomers were eluted later than the hydrophobic ones indicating that hydrogen bonding interactions are much stronger than hydrophobic interactions in the presence of ACN in chiral MEKC...
May 2007: Electrophoresis
Jingguo Hou, Jie Zheng, Syed A A Rizvi, Shahab A Shamsi
In this work, simultaneous separation of eight stereoisomers of ephedrine and related compounds ((+/-)-ephedrine, (+/-)-pseudoephedrine, (+/-)-norephedrine and (+/-)-N-methylephedrine) was accomplished using a polymeric chiral surfactant, i.e. polysodium N-undecenoxycarbonyl-L-leucinate (poly-L-SUCL) by chiral (C)MEKC-ESI-MS. The conditions of CMEKC were first investigated. The baseline separation of all eight stereoisomers of ephedrine and related compounds was achieved under optimum CMEKC conditions (35 mM poly-L-SUCL, 15 mM NH(4)OAc, pH 6...
May 2007: Electrophoresis
Cevdet Akbay, Syed A A Rizvi, Shahab A Shamsi
The feasibility of using a new and more versatile polymeric chiral surfactant, i.e., poly(sodium N-undecenoxy carbonyl-L-leucinate (poly-L-SUCL) is investigated for simultaneous enantioseparation and detection of eight structurally similar beta-blockers with tandem UV and MS detection. Three optimization approaches, i.e., direct infusion-MS, capillary zone electrophoresis-MS, and chiral micellar electrokinetic chromatography-mass spectrometry (CMEKC-MS), were investigated to optimize sheath liquid parameters, spray chamber parameters, and CMEKC separation parameters for maximum sensitivity and chiral resolution...
March 15, 2005: Analytical Chemistry
Syed A A Rizvi, Cevdet Akbay, Shahab A Shamsi
Two amino acid-based (leucine and isoleucine) alkenoxy micelle polymers were employed in this study for the separation of multichiral center-bearing beta-blockers, nadolol and labetalol. These polymers include polysodium N-undecenoxy carbonyl-L-leucinate (poly-L-SUCL) and polysodium N-undecenoxy carbonyl-L-isoleucinate (poly-L-SUCIL). Detailed synthesis and characterization were reported in our previous paper [26]. It was found that poly-L-SUCIL gives better chiral separation than poly-L-SUCL for both nadolol and labetalol isomers...
March 2004: Electrophoresis
Syed Asad Ali Rizvi, David Nicholas Simons, Shahab A Shamsi
Micellar electrokinetic chromatography (MEKC) was investigated for the enantiomeric separations of three binaphthyl derivatives ((+/-)-1,1'-bi-(2-naphthol) (BOH), (+/-)-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate (BNP), and (+/-)-1,1'-binaphthyl-2,2'-diamine (BNA)) using two recently synthesized chiral polymeric surfactants (polysodium N-undecenoxy carbonyl-L-leucinate (poly-L-SUCL) and polysodium N-undecenoxy carbonyl-L-isoleucinate (poly-L-SUCIL)) in our laboratory. Enantiomeric separation (resolution and selectivity) of the binaphthyl derivatives was influenced by polymerization concentration of the monomeric surfactant, pH, type and concentration of the background electrolyte (BGE) as well as concentration of the polymeric surfactant...
February 2004: Electrophoresis
Syed A A Rizvi, Shahab A Shamsi
Two amino acid-based alkenoxy micelle polymers were synthesized for this study. These include polysodium N-undecenoxy carbonyl-L-leucinate (poly-L-SUCL) and polysodium N-undecenoxy carbonyl-L-isoleucinate (poly-L-SUCIL). The polymerization time and concentration of the synthesized micelle polymers were optimized by (1)H-nuclear magnetic resonance (NMR) and capillary electrophoresis (CE) experiments. Detailed physicochemical properties ((1)H NMR, critical micelle concentration (CMC), optical rotation, partial specific volume, aggregation number, and polarity) were determined, and these molecular micelles were introduced as a pseudostationary phase in micellar electrokinetic chromatography to study the molecular recognition and to develop a method for simultaneous separation of eight chiral beta-blockers...
August 2003: Electrophoresis
J Hindley, G Phear, M Stein, D Beach
Sucl+ was originally identified as a DNA sequence that, at high copy number, rescued Schizosaccharomyces pombe strains carrying certain temperature-sensitive alleles of the cdc2 cell cycle control gene. We determined the nucleotide sequence of a 1,083-base-pair Sucl+ DNA fragment and S1 mapped its 866-nucleotide RNA transcript. The protein-coding sequence of the gene is interrupted by two intervening sequences of 115 and 51 base pairs. The predicted translational product of the gene is a protein of 13 kilodaltons...
January 1987: Molecular and Cellular Biology
M R Krigman, E L Hogan
Long-Evans rats were undernourished from birth by removing the mother from the sucling rats for part of each day; the undernutrition was continued after weaning till 60 days of age by restricting the daily food intake. Brain development was monitored by histologic and selected biochemical analyses coordinated with an ultrastructural morphometric analysis of the pyramidal tract of 30-day-old rats. Brain and body growth were already reduced after 10 days of undernutrition. At 20 days of age, the peak of myelination in the controls, the body and brain weights of the undernourished rats, compared to the controls, were reduced by 25 and 60%, respectively, and by the end of the study (60 days), the brain and body weights were reduced by 30 and 70%, respectively...
May 7, 1976: Brain Research
O Greengard, M S Yoss, J A Del Valle
alpha-Methylphenylalanine reduces the phenylalanine hydroxylase activity of rat liver by 75 percent. Daily injections of this substance (plus phenylalanine) into rats from the 3rd to 15th day of age had no obvious toxic effects, and maintained a plasma concentration of phenylalanine comparable to that of phenylketonuric subjects.
June 4, 1976: Science
K Shimokata, Y Nishiyama, Y Ito, Y Kimura, I Nagata
The present study was aimed to clarify the pathogenesis of Sendai virus infection to the central nervous system (CNS) of mice. One-to 2-day-old suckling and 4-week-old mice were inoculated intracerebrally with the virus. The virus multiplied higher in suclings than in adults. Immunofluorescent studies in sucklings revealed that the viral antigens appeared initially in ependyma, choroid plexus epithelium, and meninges. Subsequently they spread to subependymal cells and finally were found in neurons of hippocampus for as long as 4 months postinfection...
May 1976: Infection and Immunity
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