SOME METABOLIC EFFECTS OF ADENOVIRUS INFECTION IN HELA CELLS

1957 ◽  
Vol 3 (7) ◽  
pp. 1015-1020 ◽  
Author(s):  
K. R. Rozee ◽  
L. J. Ottey ◽  
C. E. van Rooyen
Keyword(s):  
Lactic Acid ◽  
Dehydrogenase Activity ◽  
Hela Cells ◽  
Glucose Utilization ◽  
Tricarboxylic Acid Cycle ◽  
Lactic Dehydrogenase ◽  
Tricarboxylic Acid ◽  
Metabolic Effects ◽  
Adenovirus Infection ◽  
Acid Cycle

HeLa cells infected with type 7 adenovirus produced amounts of lactic acid in excess of those produced by uninfected HeLa cells, as has been found with other adenovirus types. It was found that the increased rate of glucose utilization and higher lactic dehydrogenase activity in adenovirus-infected HeLa cells could partially explain this phenomenon. It is suggested that the terminal degradative mechanisms are more active in adenovirus-infected HeLa cells and that an operative tricarboxylic acid cycle is necessary for optimum replication of type 7 adenovirus.

Tricarboxylic acid cycle dehydrogenases inhibition by naringenin: experimental and molecular modelling evidence

2020 ◽  
Vol 123 (10) ◽  
pp. 1117-1126
Author(s):  
Pauline Maciel August ◽  
Mateus Grings ◽  
Marcelo Sartori Grunwald ◽  
Geancarlo Zanatta ◽  
Vinícius Stone ◽  
...  
Keyword(s):  
Citrate Synthase ◽  
Tricarboxylic Acid Cycle ◽  
Cell Metabolism ◽  
Tricarboxylic Acid ◽  
Metabolic Effects ◽  
Similar Reduction ◽  
Acid Cycle ◽  
Docking Simulations ◽  
Female Wistar Rats

AbstractThe study of polyphenols’ effects on health has been gaining attention lately. In addition to reacting with important enzymes, altering the cell metabolism, these substances can present either positive or negative metabolic alterations depending on their consumption levels. Naringenin, a citrus flavonoid, already presents diverse metabolic effects. The objective of this work was to evaluate the effect of maternal naringenin supplementation during pregnancy on the tricarboxylic acid cycle activity in offspring’s cerebellum. Adult female Wistar rats were divided into two groups: (1) vehicle (1 ml/kg by oral administration (p.o.)) or (2) naringenin (50 mg/kg p.o.). The offspring were euthanised at 7th day of life, and the cerebellum was dissected to analyse citrate synthase, isocitrate dehydrogenase (IDH), α-ketoglutarate dehydrogenase (α-KGDH) and malate dehydrogenase (MDH) activities. Molecular docking used SwissDock web server and FORECASTER Suite, and the proposed binding pose image was created on UCSF Chimera. Data were analysed by Student’s t test. Naringenin supplementation during pregnancy significantly inhibited IDH, α-KGDH and MDH activities in offspring’s cerebellum. A similar reduction was observed in vitro, using purified α-KGDH and MDH, subjected to pre-incubation with naringenin. Docking simulations demonstrated that naringenin possibly interacts with dehydrogenases in the substrate and cofactor binding sites, inhibiting their function. Naringenin administration during pregnancy may affect cerebellar development and must be evaluated with caution by pregnant women and their physicians.

scholarly journals Glucose metabolism and its regulation in pieces of perirenal adipose tissue from foetal lambs

1983 ◽  
Vol 210 (3) ◽  
pp. 677-683 ◽  
Author(s):  
J P Robertson ◽  
A Faulkner ◽  
R G Vernon
Keyword(s):  
Adipose Tissue ◽  
Glucose Metabolism ◽  
Pyruvate Dehydrogenase ◽  
Glucose Utilization ◽  
Tricarboxylic Acid Cycle ◽  
Tricarboxylic Acid ◽  
Pentose Phosphate ◽  
Acid Cycle ◽  
Near Term ◽  
Glucose 6 Phosphate Dehydrogenase

1. The following were measured in pieces of perirenal adipose tissue obtained from foetal lambs at about 120 days of gestation or within 3 days of term, and 9-month-old sheep: the rates of synthesis from glucose of fatty acids, acylglycerol glycerol, pyruvate and lactate; the rate of glucose oxidation to CO2 and the proportions contributed by the pentose phosphate cycle, pyruvate dehydrogenase and the tricarboxylic acid cycle; the activities of hexokinase, glucose 6-phosphate dehydrogenase, phosphofructokinase, pyruvate kinase and pyruvate dehydrogenase. 2. The total rate of glucose utilization was lower in pieces of adipose tissue from near-term lambs than 120-day foetal lambs and the pattern of glucose metabolism differed, with, for example, a much smaller proportion of glucose carbon being used for fatty acid synthesis, whereas a greater proportion of glucose oxidation occurred via the tricarboxylic acid cycle in the near-term lambs. In general, these differences in glucose metabolism were not associated with differences in the activities of the various enzymes listed above. 3. The rates of glucose utilization per fat-cell by 120-day foetal lambs and 9-month-old sheep were very similar but, again, the proportions metabolized to the various products differed. In particular, there was a smaller proportion of glucose oxidized via the pentose phosphate cycle and a greater proportion oxidized via pyruvate dehydrogenase and the tricarboxylic acid cycle in adipose tissue from foetal lambs. These differences were matched by a lower activity of glucose 6-phosphate dehydrogenase and a higher pyruvate dehydrogenase activity in fat-cells from the foetal lambs.

Evaluation of anaerobic glucose utilization by Escherichia coli strains with impaired fermentation ability upon respiration with external and internal electron acceptor

2020 ◽  
Vol 36 (3) ◽  
pp. 25-33
Author(s):  
A.Yu. Gulevich ◽  
V.G. Debabov
Keyword(s):  
Escherichia Coli ◽  
Electron Acceptor ◽  
Glucose Utilization ◽  
Tricarboxylic Acid Cycle ◽  
Tricarboxylic Acid ◽  
Nitrate Respiration ◽  
Activity Levels ◽  
Ammonium Ions ◽  
Acid Fermentation ◽  
Acid Cycle

The characteristics of anaerobic glucose utilization and metabolite production by recombinant Escherichia coli strains with impaired fermentation ability upon respiration with pyruvate as an internal and nitrate as an external electron acceptor have been studied. It was found that respiration processes utilizing pyruvic acid as an endogenous electron acceptor and leading to the lactate and alanine formation were capable of mutual interference. After elimination of ammonium ions from the medium, the native activity levels of respiratory lactate dehydrogenases Did and LldD in E. coli strains deficient in the mixed acid fermentation pathways can almost completely compensate for the loss of activity of respiratory alanine dehydrogenase DadA, but are insufficient to maintain the entire intracellular redox balance. The addition of nitrate ions in the medium abolished alanine production by the strains despite the availability of ammonium ions, while the functionality of respiratory reduction of endogenous pyruvate to lactate retained in the studied strains even in the presence of a strong exogenous oxidant. Respiration with external electron acceptor provoked the activation of the oxidative tricarboxylic acid cycle in the strains. Anaerobic glucose utilization by the strain with interrupted tricarboxylic acid cycle increased during nitrate respiration, but remained restricted by the excessive generation of reducing equivalents in the residual reactions of the cycle. Escherichia coli, glucose, fermentation, respiration, pyruvate, lactate, alanine, nitrate, ammonium. The work was supported by a grant from the Russian Foundation for Basic Research (project #18-04-01222).

scholarly journals Metabolic effects of pent-4-enoate in isolated perfused rat heart

1978 ◽  
Vol 170 (2) ◽  
pp. 241-247 ◽  
Author(s):  
J K Hiltunen
Keyword(s):  
Cardiac Muscle ◽  
Tricarboxylic Acid Cycle ◽  
Fold Increase ◽  
Tricarboxylic Acid ◽  
Metabolic Effects ◽  
Acid Cycle ◽  
Metabolic Characteristics ◽  
Rat Hearts ◽  
Hypoglycaemic Agent ◽  
Tricarboxylic Acid Cycle Intermediates

The metabolic effects of the hypoglycaemic agent pent-4-enoate were studied in isolated, beating or potassium-arrested rat hearts. The addition of 0.8mM-pent-4-enoate to the perfusion fluid increased O2 consumption by 76% in the arrested heart and by 14% in the beating heart; the concentration ratio of phosphocreatine/creatine increase concomitantly by 47% and 27% respectively. Perfusion of the heart with pent-4-enoate resulted in a 30-fold increase in the concentration of the pool of tricarboxylic acid-cycle intermediates in the tissue, about 90% of this increase being due to malate. The sum of the concentrations of the myocardial free amino acids remained virtually unchanged during the accumulation of the tricarboxylic acid-cycle intermediates. It was concluded that pent-4-enoate can be effectively metabolized in the myocardium and that its metabolism probably proceeds via propionyl-CoA, since pent-4-enoate reproduces many of the metabolic characteristics of propionate in the cardiac muscle. The accumulation of the tricarboxylic acid-cycle intermediates is probably due to carboxylation of propionyl-CoA. The response pattern of the metabolite concentrations in the cardiac muscle is quite different from that in the liver, in which decrease of the concentrations of the tricarboxylic acid-cycle intermediates has been observed previously [Williamson, Rostand & Peterson (1970) J. Biol. Chem. 245, 3242-3251].

scholarly journals Tricarboxylic acid-cycle and related enzymes in restricted facultative methylotrophs

1975 ◽  
Vol 148 (3) ◽  
pp. 505-511 ◽  
Author(s):  
J Colby ◽  
L J Zatman
Keyword(s):  
Succinate Dehydrogenase ◽  
Dehydrogenase Activity ◽  
Isocitrate Dehydrogenase ◽  
Tricarboxylic Acid Cycle ◽  
Tricarboxylic Acid ◽  
Methylotrophic Bacteria ◽  
Acid Cycle ◽  
Oxoglutarate Dehydrogenase ◽  
Specific Activities ◽  
Succinyl Coa Synthetase

The isolation is described of pure cultures of three non-methane-utilizing methylotrophic bacteria which, together with the previously described Bacillus PM6, have a very limited range of growth substrates; these organisms are designated “restricted facultative’ methylotrophs. Two of these isolates, W6A and W3A1, grow only on glucose out of 50 non-C1 compounds tested, whereas the third isolate S2A1 and Bacillus PM6 grow on betaine, glucose, gluconate, alanine, glutamate, citrate and nutrient agar, but not on any of a further 56 non-C1 compounds. Crude sonic extracts of trimethylamine-grown and glucose-grown W6A and W3A1 isolates, and of trimethylamine-grown C2A1 (an obligate methylotroph) contain (i) no detectable 2-oxogltarate dehydrogenase activity, (ii) very low or zero specific activities of succinate dehydrogenase and succinyl-CoA synthetase and (iii) NAD+-dependent isocitrate dehydrogenase activity. Extracts of trimethylamine-grown PM6 and S2A1 methylotrophs have (i) very low 2-oxoglutarate dehydrogenase specific activities, (ii) comparatively high specific activities of succinate dehydrogenase, malate dehydrogenase and succinyl-CoA synthetase and (iii) NADP+-dependent isocitrate dehydrogenase activity but no NAD+-dependent isocitrate dehydrogenase activity. The activities of most of these enzymes are increased during growth on glucose, alanine, glutamate or citrate, but only very low 2-oxoglutarate dehydrogenase activities are present under all growth conditions. The restricted facultative methylotrophs grow on certain non-C1 compounds in the absence of 2-oxoglutarate dehydrogenase and, in some cases, of other enzymes of the tricarboxylic acid cycle; these lesions cannot therefore be the sole cause of obligate methylotrophy.

Substrate-dependent alteration in O2 consumption and energy metabolism in vascular smooth muscle

1996 ◽  
Vol 270 (6) ◽  
pp. H1869-H1877 ◽  
Author(s):  
J. T. Barron ◽  
S. J. Kopp ◽  
J. Tow ◽  
J. E. Parrillo
Keyword(s):  
Smooth Muscle ◽  
Lactic Acid ◽  
Energy Metabolism ◽  
Vascular Smooth Muscle ◽  
Acid Production ◽  
Tricarboxylic Acid Cycle ◽  
Lactic Acid Production ◽  
Tricarboxylic Acid ◽  
O2 Consumption ◽  
Acid Cycle

Energy metabolism and the substrate utilization pattern of intact porcine carotid artery were investigated in the presence or absence of glucose and/or octanoate during the phases of isometric contraction induced by K+ depolarization. During the early phase of contraction, there was a rapid increase in the rate of O2 uptake that was independent of the rate of force generation but dependent on the availability of intracellular pyruvate, the source of which was glucose and not glycogen. Lactate production increased linearly from the onset of contractile stimulation and was not suppressed by octanoate oxidation. There was no alteration from the basal resting state in the concentrations of the metabolites of the tricarboxylic acid cycle in the presence or absence of octanoate. During the phase of steady-state force maintenance, O2 consumption was increased compared with the basal unstimulated rate but was not increased when glucose and octanoate were present, which is consistent with the Crabtree effect. This was associated with increased aerobic lactic acid production and inhibition of the tricarboxylic acid cycle at the citrate synthase step. Alteration of the high-energy phosphate content could not account for the pattern of O2 consumption during contraction under different substrate conditions. In the absence of glucose, the energy from octanoate oxidation could substitute for the energy ordinarily derived from aerobic glycogen and lactic acid production. It is concluded that energy metabolism of vascular smooth muscle is coordinated during contraction by integration of the pathways of aerobic glycolysis and oxidative phosphorylation.

scholarly journals Effects of sevoflurane anesthesia and abdominal surgery on the systemic metabolome: a prospective observational study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yiyong Wei ◽  
Donghang Zhang ◽  
Jin Liu ◽  
Mengchan Ou ◽  
Peng Liang ◽  
...  
Keyword(s):  
Abdominal Surgery ◽  
General Anesthesia ◽  
Tricarboxylic Acid Cycle ◽  
Tricarboxylic Acid ◽  
Metabolic Changes ◽  
Sevoflurane Anesthesia ◽  
Glutamate Metabolism ◽  
Acid Cycle ◽  
Link Type ◽  
The Mean

Abstract Background Metabolic status can be impacted by general anesthesia and surgery. However, the exact effects of general anesthesia and surgery on systemic metabolome remain unclear, which might contribute to postoperative outcomes. Methods Five hundred patients who underwent abdominal surgery were included. General anesthesia was mainly maintained with sevoflurane. The end-tidal sevoflurane concentration (ETsevo) was adjusted to maintain BIS (Bispectral index) value between 40 and 60. The mean ETsevo from 20 min after endotracheal intubation to 2 h after the beginning of surgery was calculated for each patient. The patients were further divided into low ETsevo group (mean − SD) and high ETsevo group (mean + SD) to investigate the possible metabolic changes relevant to the amount of sevoflurane exposure. Results The mean ETsevo of the 500 patients was 1.60% ± 0.34%. Patients with low ETsevo (n = 55) and high ETsevo (n = 59) were selected for metabolomic analysis (1.06% ± 0.13% vs. 2.17% ± 0.16%, P < 0.001). Sevoflurane and abdominal surgery disturbed the tricarboxylic acid cycle as identified by increased citrate and cis-aconitate levels and impacted glycometabolism as identified by increased sucrose and D-glucose levels in these 114 patients. Glutamate metabolism was also impacted by sevoflurane and abdominal surgery in all the patients. In the patients with high ETsevo, levels of L-glutamine, pyroglutamic acid, sphinganine and L-selenocysteine after sevoflurane anesthesia and abdominal surgery were significantly higher than those of the patients with low ETsevo, suggesting that these metabolic changes might be relevant to the amount of sevoflurane exposure. Conclusions Sevoflurane anesthesia and abdominal surgery can impact principal metabolic pathways in clinical patients including tricarboxylic acid cycle, glycometabolism and glutamate metabolism. This study may provide a resource data for future studies about metabolism relevant to general anaesthesia and surgeries. Trial registration www.chictr.org.cn. identifier: ChiCTR1800014327.

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