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PubMedDate not supplied

[Change in the tricarboxylic acid cycle dehydrogenase activity under the action of thyroxine in the brain of animals of varying age].

The effect of thyroxin on the activities of tricarboxylic acid cycle enzymes and NADP-malate dehydrogenase in the rat brain was studied. Experiments were conducted on 20- and 40-day old and on adult rats. Injection of L-thyroxin (50 microgram/100 g body weight) to thyroidectomized rats induced some changes in the activities of citrate-syntase, dehydrogeases of TAC and malic enzymes in the mitochondrial and cytoplasmic fractions of the brain. The most significant effect of the hormone was found in the brain of 20-day old rats there was an increase of the enzyme activities by 40--60%. The effect of the hormone on the enzymes activities could be prevented by simultaneous administration of actinomycin D (10 microgram intracerebrally). This fact indicates that the main mechanism in increasing the enzymic activity lies, probably, in stimulation of the enzyme biosynthesis by the hormone.

Aging↗
PubMed2000

Metabolism of alternative substrates and the bioenergetic status of EMT6 tumor cell spheroids.

In order to evaluate the ability of EMT6/Ro multicellular spheroids to utilize various pathways of energy production, (13)C and (31)P MRS have been employed to monitor the metabolism of glucose, glutamine, acetate and propionate. EMT6/Ro spheroids perfused with culture medium containing 5.5 mM glucose maintain stable levels of nucleotide triphosphates (NTP) and phosphocreatine (PCr) for up to 48 h, even in the absence of glutamine. The metabolism of 1-(13)C-glucose was almost entirely to 3-(13)C-lactate (88 +/- 12%, n = 7), even though the perfusion medium was equilibrated with 95% O(2). Labeling was also observed in other glycolytic metabolites, primarily alanine and alpha-glycerolphosphate. A low level of (13)C labeling in glutamate, indicative of mitochondrial oxidative metabolism (TCA cycle), was consistently detected when spheroids were perfused with 1-(13)C-glucose, almost exclusively in the C4 position of glutamate. Labeling of glutamate C2 and C3 was always less than 20% of the labeling in C4 and was usually undetectable. No evidence of adjacent carbon labeling in individual glutamate molecules (indicative of multiple cycles of label incorporation) was found, even in high-resolution (13)C NMR spectra of extracts from cells or spheroids. Despite the predominantly glycolytic metabolism of glucose, the mitochondrial substrate glutamine (2 mM, in the presence of < or =0.5 mM glucose from fetal bovine serum), supported stable levels of NTP and PCr in the tumor cells for up to 12 h. In the presence of 2.5 mM acetate, the bioenergetic status of cells in EMT6 spheroids declined slowly but measurably, and no incorporation of label from 2-(13)C-acetate into other metabolites was detected either in intact perfused spheroids or in high-resolution spectra of extracts. In contrast, when the anaplerotic TCA cycle substrate 3-(13)C-propionate replaced acetate, the high-energy phosphate levels in EMT6/Ro spheroids were somewhat reduced, but stabilized at a new lower level. Incubation of spheroids with 3-(13)C-propionate (with natural abundance glucose and glutamine) resulted in label detectable in the C2 and C3 of glutamate, but the primary labeled compound was methylmalonate, an intermediate in propionate metabolism. Addition of vitamin B(12), a cofactor for methylmalonyl CoA reductase, to the growth medium 24 h prior to perfusion with propionate resulted in the elimination of the methylmalonate resonance. A variety of 2- and 3-labeled metabolites were detected, including succinate, malate and glutamate. Labeling of C2 and C3 of lactate implicated cytoplasmic malic enzyme activity.

Animals↗
PubMed1996

Isolation, characterization and expression of cDNA clones encoding a mitochondrial malate translocator from Panicum miliaceum L.

Three cDNA clones that hybridize to a partial rice cDNA that show similarity to bovine mitochondrial 2-oxoglutarate/malate translocator were isolated from leaves of Panicum miliaceum L. (proso millet), an NAD-malic enzyme-type C4 plant. The nucleotide sequences of the clones resemble each other, and some of the isolated cDNAs contained extra sequences that seemed to be introns. The predicted proteins encoded by the cDNAs have 302 amino acids and molecular weights of 32211 and 32150. The hydrophobic profile of the amino acid sequence predicted the existence of six transmembrane alpha-helices that is a common property of members in the mitochondrial transporter family. The predicted amino acid sequence showed the highest similarity with that of the 2-oxoglutarate/malate translocator from mammalian mitochondria. An expression plasmid containing the coding region of the cDNAs was used to over-express recombinant protein with a C-terminal histidine tag Escherichia coli, which was affinity purified. The antibody against the recombinant protein cross-reacted with proteins of 31-32 kDa in the membrane fraction from P. miliaceum mitochondria, but not with the chloroplast fraction. The recombinant protein reconstituted in liposomes efficiently transported malate, citrate, and 2-oxoglutarate.

Amino Acid Sequence↗
PubMed1992

NADP-malic enzyme from plants.

NADP-malic enzyme functions in plant metabolism as a decarboxylase of malate in the chloroplast or cytosol. It serves as a source of CO2 for photosynthesis in the bundle sheath chloroplasts of C4 plants and in the cytosol of Crassulacean acid metabolism plants, and as a source of NADPH and pyruvate in the cytosol of various tissues. Mg2+ or Mn2+ is required as a cofactor. The enzyme has a high specificity and low Km for NADP+. It exists as a tetramer which may undergo changes in oligomerization and exhibit hysteresis. Its kinetic properties vary depending on the compartmentation and function of the enzyme. The chloroplast form in C4 plants has a high pH optimum (pH 8) under high malate, which favours the tetramer, whereas lower pH (pH 7) favours the dimer form. Generally, other forms of the enzyme, which are thought to be cytosolic, have lower pH optima than the chloroplast enzyme. In a number of cases these forms have been shown to have allosteric properties with malate as a substrate. Chemical modifications of the plant enzyme suggest sulphydryl, histidine and arginine residues are required for catalysis. Primary sequence studies on the chloroplastic enzyme from C4 plants show significant similarities to cytosolic NADP-ME in plants and animals, including a sequence motif which is indicative of the NADP+ binding site. The possible origin of the chloroplast form of the enzyme is discussed.

Amino Acid Sequence↗
PubMed2003

Methimazole and thyroid hormone replacement in broilers.

Seven-day-old chickens were fed diets containing 18% crude protein + 0 or 1g methimazole/kg to produce either euthyroid or hypothyroid groups of birds at 28 days of age. These two groups were then offered diets containing either 0 or 1mg triiodothyronine (T(3))/kg diet. Birds were sampled at 0, 2, 5, and 8 days following the onset of the T(3) treatment. Measurements taken at these intervals included in vitro hepatic lipogenesis (IVL), growth and feed consumption, hepatic enzyme activities (malic enzyme, ME; isocitrate dehydrogenase, ICD; and aspartate amino transferase, AAT), plasma hormones (T(3); thyroxine, T(4); insulin like growth factors I, IGF-I; and insulin like growth factors II, IGF-II) and metabolites (glucose; fatty acids, NEFA; triglyerides; uric acid). Hypothyroidism decreased IVL and ME at 28 days of age; however, T(3) supplementation for 2 days restored both IVL and ME. Paradoxically, continuing T(3) replenishment for an additional 3-6 days decreased IVL without affecting ME activity. In contrast, supplemental T(3) decreased IVL in euthyroid birds, regardless of the dosing interval, but had no effect on ME activity. Methimazole decreased plasma T(3), T(4), uric acid, and IGF-I, but did not affect IGF-II at 28 days. Giving T(3) to birds previously on methimazole increased plasma IGF-I as did feeding a control diet. Supplemental T(3) increased NEFA in both euthyroid and hypothyroid birds, but only for a short period following the initiation of supplementation (2 days post-supplementation). These data may help to explain some of the apparent reported dichotomies in lipid metabolism elicited by changes in the thyroid state of animals. In addition, most metabolic changes in response to feeding T(3) occurred within 2-5 days, suggesting that changes in intermediary metabolism preceded morphological changes. In conclusion, the thyroid state of the animal will determine responses to exogenous T(3).

Animals↗
PubMed1991

Thyromimetic effect of peroxisomal proliferators in rat liver.

Amphipathic carboxylates, of varying hydrophobic backbones, which act as peroxisomal proliferators (aryloxyalkanoic acids, methyl-substituted dicarboxylic acid) induce in euthyroid or thyroidectomized rats, as well as in rat hepatocytes cultured in 3,5,3'-tri-iodo-L-thyronine (T3)-free media, liver enzyme activities that are classically considered to be thyroid-hormone-dependent (malic enzyme, mitochondrial alpha-glycerophosphate dehydrogenase, glucose-6-phosphate dehydrogenase and S14). The dose required in vivo for the thyromimetic effect of peroxisomal proliferators was 10(3)-fold higher than the dose of T3 required. Similarly, peroxisomal proliferators were active in culture in the range 1-100 microM compared with 1 nM for T3. Their maximal inductive capacities were, however, similar to or greater than that of T3. The thyromimetic effect of peroxisomal proliferators was only partially correlated with their capacities as inducers of liver peroxisomal enzymes. The thyromimetic effect with respect to liver malate dehydrogenase and S14 resulted from an increase in their mRNA contents. The increase in liver S14 mRNA was accounted for by transcriptional activation of the S14 gene. T3 binding to isolated liver nuclei or nuclear extract was competitively displaced by some but not all of the non-thyroidal inducers of the above liver activities. In contrast with the thyromimetic effect induced in liver cells, no increase in growth hormone mRNA was observed in cultured GH1 pituitary cells incubated in the presence of non-thyroidal amphipathic carboxylates. The characteristics of the thyromimetic effect of amphipathic carboxylic peroxisomal proliferators indicate that these agents may act as transcriptional activators of thyroid-hormone-dependent genes in the rat liver.

Animals↗
PubMed1979

Interrelationships in rats among dietary vitamin B6, glycine and hydroxyproline. Effects of oxalate, glyoxylate, glycolate, and glycine on liver enzymes.

Urinary endogenous oxalate was increased by feeding vitamin B6-deficient or control rats with 5.2% hydroxyproline, or 3% glycine plus 5.2% hydroxyproline. The activities of liver lactic dehydrogenase (LDH), glucose-6-phosphate dehydrogenase (G6PD) , malic enzyme (ME), and ATP citrate lyase were decreased in vitamin B6-DEFICIENT RATS, AND THEIR LIVEr G6PD was further decreased by the addition of glycine and hydroxyproline to their diets. Supplementing control diets with the two amino acids decreased the activities of rat liver LDH, G6PD, and ATP citrate lyase. The effects of glycine and hydroxyproline feeding on the enzymes studied did not appear related to alterations in insulin availability. Since in vitamin B6-deficient rats, there are increases in urinary levels of oxalic and glycolic acids, and glycine, and increases in tissue levels of glyoxylic acid and glycine, the effects of these metabolites on the activities of the above mentioned enzymes were measured. Oxalic acid inhibited the activities of LDH, G6PD, and ME. Glyoxylic acid inhibited LDH and ME, but not G6PD. Glycolic acid inhibited G6PD and ME, but not LDH. ATP citrate lyase was not affected by these substances. Glycine had no effect on the enzymes studied. Diets which increased oxalate excretion generally reduced or did not alter liver and kidney levels of oxalate, glycolate, and glyoxylate. However, the feeding of glycine and hydroxyproline increased kidney oxalate, and liver and kidney glyoxylate in vitamin B6-deficient rats.

ATP Citrate (pro-S)-Lyase↗
PubMed1975

Positional information and pattern regulation in hydra: enzyme profiles.

Certain key enzymes of alternative pathways of glucose metabolism, of amino acid metabolism and of redox systems have been measured in hydra and this profile compared with mammalian differentiated tissues with a view to locating pathways of specific importance in hydra. There was a marked constant proportionality in the major part of the enzymes investigated, the profile suggested a metabolic pattern geared to utilization of amino acids as a carbon source for biosynthesis and energy production and to the production and conservation of pyruvate. The importance of conversion to ionized forms was noted. The most notable specific proportion changes were the exceptionally low lactate dehydrogenase, malic enzyme and the relatively high citrate synthase. The proximal-distal gradients in hydra were examined and these gradients suggested a switch to a more anaerobic type of metabolism and an elevation of the pentose phosphate pathway as the basal region was approached. Measurements of the formation of 14CO2 from specifically labelled glucose provided additional evidence for the functional activity and polarity of the pentose phosphate pathway in hydra. The effect of oligomycin, which can reverse polarity in hydra, had a significant effect on gradients of enzymes eliminating all except that observed for G6P dehydrogenase. The profile suggested a movement towards a more anaerobic type of metabolism, in keeping with the known biochemical action of this inhibitor. It is suggested that redox states and/or phosphorylation states may be featured in the positional information of cells in hydra.

Alanine Transaminase↗
PubMed1984

Membrane enzymes associated with the dissimilation of some citric acid cycle substrates and production of extracellular oxidation products in chemostat cultures of Pseudomonas fluorescens.

Enzyme activities forming extracellular products from succinate, fumarate, and malate were examined using washed cell suspensions of Pseudomonas fluorescens from chemostat cultures. Membrane-associated enzyme activities (glucose, gluconate, and malate dehydrogenases), producing large accumulations of extracellular oxidation products in carbon-excess environments, have previously been found in P. fluorescens. Investigations carried out here have demonstrated the presence in this microorganism of a malic enzyme activity which produces extracellular pyruvate from malate in carbon-excess environments. Although the three membrane dehydrogenase enzymes decrease significantly in carbon-limited chemostat cultures, malic enzyme activity was found to increase fourfold under these conditions. The regulation of malate dehydrogenase and malic enzyme by malate or succinate was similar. Malate dehydrogenase increased and malic enzyme decreased in carbon-excess cultures. The opposite effect was observed in carbon-limited cultures. When pyruvate or glucose was used as the carbon source, malate dehydrogenase was regulated similarly by the available carbon concentration, but malic enzyme activity producing extracellular pyruvate was not detected. While large accumulations of extracellular oxalacetate and pyruvate were produced in malate-excess cultures, no extracellular oxidation products were detected in succinate-excess cultures. This may be explained by the lack of detectable activity for the conversion of added external succinate to extracellular fumarate and malate in cells from carbon-excess cultures. In cells from carbon-limited (malate or succinate) cultures, very active enzymes for the conversion of succinate to extracellular fumarate and malate were detected. Washed cell suspensions from these carbon-limited cultures rapidly oxidized added succinate to extracellular pyruvate through the sequential action of succinate dehydrogenase, fumarase, and malic enzyme. Succinate dehydrogenase and fumarase activities producing extracellular products were not detected in cells from chemostat cultures using pyruvate or glucose as the carbon source. Uptake activities for succinate, malate, and pyruvate also were found to increase in carbon-limited (malate or succinate) and decrease in carbon-excess cultures. The role of the membrane-associated enzymes forming different pathways for carbon dissimilation in both carbon-limited and carbon-excess environments is discussed.

Ammonia↗
PubMed2004

Metabolic network analysis on Phaffia rhodozyma yeast using 13C-labeled glucose and gas chromatography-mass spectrometry.

Carotenoid production by microorganisms, as opposed to chemical synthesis, could fulfill an ever-increasing demand for 'all natural' products. The yeast Phaffia rhodozyma has received considerable attention because it produces the red pigment astaxanthin, commonly used as an animal feed supplement. In order to have a better understanding of its metabolism, labeling experiments with [1-(13)C]glucose were conducted with the wildtype strain (CBS5905T) and a hyper-producing carotenoid strain (J4-3) in order to determine their metabolic network structure and estimate intracellular fluxes. Amino acid labeling patterns, as determined by GC-MS, were in accordance with a metabolic network consisting of the Embden-Meyerhof-Parnas pathway, the pentose phosphate pathway, and the TCA cycle. Glucose was mainly consumed along the pentose phosphate pathway ( approximately 65% for wildtype strain), which reflected high NADPH requirements for lipid biosynthesis. Although common to other oleaginous yeast, there was no, or very little, malic enzyme activity for carbon-limited growth. In addition, there was no evidence of phosphoketolase activity. The central carbon metabolism of the mutant strain was similar to that of the wildtype strain, though the relative pentose phosphate flux was lower and the TCA cycle flux in accordance with the biomass yield being lower.

Basidiomycota↗
PubMedDate not supplied

Hydrogen gas evolution and carbon dioxide fixation with visible light by chlorophyllin coupled with polyethylene glycol.

Chlorophyllin a was conjugated with alpha-(3-aminopropyl)-omega-methoxypoly(oxyethylene), PEG-NH(2), to form the PEG-chlorophyllin conjugate through acid-amide bonds. The PEG-chlorophyllin conjugate was stable toward light illumination under anaerobic condition in comparison with chlorophyllin a. The conjugate catalyzed the reduction of methyl viologen in the presence of 2-mercaptoethanol and the evolution of hydrogen gas in the presence of methyl viologen (an electron carrier), 2-mercaptoethanol (an electron donor) and hydrogenase (Scheme 1). Furthermore, the PEG-chlorophyllin conjugate catalyzed the photoreduction of NADP(+) or NAD(+) in the presence of ascorbate as an electron donor and ferredoxin-NADP(+) reductase as the coupling enzyme. Utilizing the reducing power of NADPH generated by the PEG-chlorophyllin conjugate under the illumination, CO(2) fixation was accomplished by the synthesis of malate (C(4)) from pyruvate (C(3)) and CO(2) in the presence of malic enzyme (Scheme 2). These reactions mentioned above did never proceed in dark or without each enzyme.

Anaerobiosis↗
PubMed1998

Characterization of thyroid hormone response elements in the gene for chicken malic enzyme. Factors that influence triiodothyronine responsiveness.

Transcription of the gene for malic enzyme in chick embryo hepatocytes is stimulated about 30-fold by triiodothyronine (T3). T3 responsiveness is mediated by seven direct repeat hexamers that resemble T3 response elements (T3REs); these elements are located far upstream in the 5'-flanking DNA (Hodnett, D. W., Fantozzzi, D. A., Thurmond, D. C., Klautky, S. A., MacPhee, K. G., Estrem, S. T., Xu, G., and Goodridge, A. G. (1996) Arch. Biochem. Biophys. 334, 309-324). In transiently transfected hepatocytes, single copies of six of these elements conferred varying degrees of T3 responsiveness to linked reporter genes. In gel electrophoretic mobility shift analyses, the T3REs bound retinoid X receptor (RXR)-T3 receptor (TR) heterodimers and non-RXR/TR factors present in nuclear extracts prepared from hepatocytes. Binding of the non-RXR/TR factors was specific to individual T3REs and was unaffected by antibodies to TR or RXR. Mutagenesis of binding sites for proteins specific for T3REs 2-5 altered binding of the proteins and T3 responsiveness. These factors appear to bind to and alter function of T3REs without binding directly to TR, differentiating their actions from other TR cofactors; they were tentatively characterized as co-repressors, inhibitors, and activators of T3RE function. Together with RXR and TR, they modulate T3 responsiveness of the gene for chicken malic enzyme.

Animals↗
PubMed1985

Regulation of flux through pyruvate dehydrogenase and pyruvate carboxylase in rat hepatocytes. Effects of fatty acids and glucagon.

The regulation of flux through pyruvate dehydrogenase (PDH) and pyruvate carboxylase (PC) by fatty acids and glucagon was studied in situ, in intact hepatocyte suspensions. The rate of pyruvate metabolized by carboxylation plus decarboxylation was determined from the incorporation of [1-14C]pyruvate into 14CO2 plus [14C]glucose. The flux through PDH was determined from the rate of formation of 14CO2 from [1-14C]pyruvate corrected for other decarboxylation reactions (citrate cycle, phosphoenolpyruvate carboxykinase and malic enzyme), and the flux through PC was determined by subtracting the flux through PDH from the total pyruvate metabolized. With 0.5 mM pyruvate as substrate the ratio of flux through PDH/PC was 1.9 in hepatocytes from fed rats and 1.4 in hepatocytes from 24 h-starved rats. In hepatocytes from fed rats, octanoate (0.8 mM) and palmitate (0.5 mM) increased the flux through PDH (59-76%) and PC (80-83%) without altering the PDH/PC flux ratios. Glucagon did not affect the flux through PDH but it increased the flux through PC twofold, thereby decreasing the PDH/PC flux ratio to the value of hepatocytes from starved rats. In hepatocytes from starved rats, fatty acids had similar effects on pyruvate metabolism as in hepatocytes from fed rats, however glucagon did not increase the flux through PC. 2[5(4-Chlorophenyl)pentyl]oxirane-2-carboxylate (100 microM) an inhibitor of carnitine palmitoyl transferase I, reversed the palmitate-stimulated but not the octanoate-stimulated flux through PDH, in cells from fed rats, indicating that the effects of fatty acids on PDH are secondary to the beta-oxidation of fatty acids. This inhibitor also reversed the stimulatory effect of palmitate on PC and partially inhibited the flux through PC in the presence of octanoate suggesting an effect of POCA independent of fatty acid oxidation. It is concluded that the effects of fatty acids on pyruvate metabolism are probably secondary to increased pyruvate uptake by mitochondria in exchange for acetoacetate. Glucagon favours the partitioning of pyruvate towards carboxylation, by increasing the flux through pyruvate carboxylase, without directly inhibiting the flux through PDH.

Animals↗
PubMed1990

Pyruvate utilization of rabbit reticulocytes--a compartmental study.

The utilization of [2-14C] pyruvate via the citric acid cycle of rabbit reticulocytes was studied to elucidate the importance of carboxylation- and decarboxylation reactions in this cell type. Unknown flux rates were determined by fitting the observed time-dependent labeling of CO2, alanine, glutamate and aspartate (all carbon atoms and C alpha) to the corresponding set of differential equations. The results reveal a high activity of the shuttle rate between mitochondrial pyruvate and the C4 pool catalysed by the pyruvate carboxylase (v = 19.1 nM/ml cells/min) and the malic enzyme (v = 57.5 mM/ml cells/min) which is comparable with the flux rate within the citrate cycle (v2 = 46.2 nM/ml cells/min). Moreover, our studies provide strong indications for the existence of a pyruvate utilizing metabolic pathway which has not been described so far.

Alanine↗
PubMed2001

Effect of hesperetin, a citrus flavonoid, on the liver triacylglycerol content and phosphatidate phosphohydrolase activity in orotic acid-fed rats.

The effect of dietary hesperetin on the hepatic lipid content and the enzyme activities involved in triacylglycerol (TG) synthesis in rats fed diets with or without 1% orotic acid (OA) was studied. Hepatic TG content was raised by approximately 5-fold after administration of OA for 10 days. The OA-feeding significantly increased the activity of hepatic microsomal phosphatidate phosphohydrolase (PAP), which is the rate-limiting enzyme for TG synthesis. Hepatic glucose-6-phosphate dehydrogenase (G6PDH) and malic enzyme activities were also increased. An addition of 1% hesperetin to the OA-supplemented diet resulted in the decrease of the hepatic TG content by 44% and of microsomal PAP activity. Dietary hesperetin alone neither affected liver TG content nor PAP activity significantly. OA-feeding caused an increased liver cholesterol level, whereas simultaneous addition of hesperetin and OA reduced its content to the control level. A slight reduction of hepatic cholesterol by hesperetin was also observed in the OA-free dietary group. The present study demonstrated that dietary hesperetin can reduce the hepatic TG accumulation induced by OA, and this was associated with the reduced activity of TG synthetic enzyme, PAP.

Animals↗
PubMed2006

Adipose gene expression response of lean and obese mice to short-term dietary restriction.

Overweight and obesity lead to higher morbidity risks, which are alleviated even by mild weight loss. To gain insight in the molecular effects of weight loss in adipose tissue, we analyzed the effects of short-term dietary restriction (DR) on mice fed a low-fat diet (lean mice) or a high-fat diet (obese mice). Female C57Bl6/J mice on both diets were on DR until an average body weight loss of 20%, which was achieved in 8 to 12 days depending on body weight at the start of DR. Plasma free fatty acids and blood glucose levels decreased significantly on DR. In the (restricted) low-fat diet groups, gene expression analysis using adipose-enriched cDNA microarrays revealed only two transcripts to be significant differentially expressed by DR: up-regulation of malic enzyme (Mod1) and down-regulation of major urinary protein 1 (Mup1). Real-time polymerase chain reaction analysis confirmed these findings and showed, for the high-fat diet groups, an identical expression pattern for Mup1, whereas Mod1 showed an opposed gene expression pattern for the high-fat diet groups. In conclusion, initial weight loss induces transcriptional changes only in a very small number of adipose genes, which also depends on the (restricted) diet used.

Adipose Tissue↗