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Contribution of malic enzyme, pyruvate kinase, phosphoenolpyruvate carboxylase, and the krebs cycle to respiration and biosynthesis and to intracellular pH regulation during hypoxia in maize root tips observed by nuclear magnetic resonance imaging and gas chromatography-mass spectrometry

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In vivo pyruvate synthesis by malic enzyme (ME) and pyruvate kinase and in vivo malate synthesis by phosphoenolpyruvate carboxylase and the Krebs cycle were measured by 13C incorporation from [1-13C]glucose into glucose-6-phosphate, alanine, glutamate, aspartate, and malate. These metabolites were

Malic enzyme tracers reveal hypoxia-induced switch in adipocyte NADPH pathway usage.

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The critical cellular hydride donor NADPH is produced through various means, including the oxidative pentose phosphate pathway (oxPPP), folate metabolism and malic enzyme. In growing cells, it is efficient to produce NADPH via the oxPPP and folate metabolism, which also make nucleotide precursors.

Antioxidant defenses preserve membrane transport activity in Chironomus riparius larvae exposed to anoxia.

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Changes in enzyme activities, metabolite concentrations, and membrane transport activity underlying the Chironomus riparius larvae adaptive response to anoxia were investigated. Trehalose, malate, and aspartate degradation and alanine accumulation were recorded. During anoxia exposure, there was a

Reducing properties, energy efficiency and carbohydrate metabolism in hyperhydric and normal carnation shoots cultured in vitro: a hypoxia stress?

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Hyperhydricity is considered as a physiological disorder that can be induced by different stressing conditions. In the present work we have studied the metabolic and energetic states of hyperhydric carnation shoots. We have evaluated the hypothesis that hypoxia stress is the main factor affecting

Effect of hypoxia on the expression of nuclear genes encoding mitochondrial proteins in U87 glioma cells.

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We have studied the effect of hypoxia on the expression of nuclear genes encoding mitochondrial proteins in U87 glioma cells under the inhibition of IRE1 (inositol requiring enzyme-1), which controls cell proliferation and tumor growth as a central mediator of endoplasmic reticulum stress. It was

Malic Enzyme 1 Is Associated with Tumor Budding in Oral Squamous Cell Carcinomas

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Budding at the tumor invasive front has been correlated with the malignant properties of many cancers. Malic enzyme 1 (ME1) promotes the Warburg effect in cancer cells and induces epithelial-mesenchymal transition (EMT) in oral squamous cell carcinoma (OSCC). Therefore, we investigated the role of

[Effect of hypobaric hypoxia on the dehydrogenase activities of respiration and photosynthetic metabolism in barley seedlings].

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Hypobaric hypoxia effects on enzymes of photosynthesis and respiration metabolism were explored in 8-day old seedlings of barley Hordeum vulgare L. in the dark or light. 16-hour exposure in rarified atmosphere that causes reductions of partial pressure of air gases and, consequently, hypobaric

Maize cytosolic NADP-malic enzyme (ZmCytNADP-ME): a phylogenetically distant isoform specifically expressed in embryo and emerging roots.

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Two maize plastidic NADP-malic enzyme isoforms have been characterized: the bundle sheath-located photosynthetic isoform (ZmC(4)-NADP-ME) and a constitutively expressed one (Zm-nonC(4)-NADP-ME). In this work, the characterization of the first maize cytosolic NADP-ME (ZmCytNADP-ME) is presented,

Peach (Prunus persica) fruit response to anoxia: reversible ripening delay and biochemical changes.

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The use of modified atmospheres has been successfully applied in different fruits to delay the ripening process and to prevent physiological disorders. In addition, during normal ripening, hypoxic areas are generated inside the fruit; moreover, anaerobic conditions may also arise during fruit

Chronic intermittent hypoxia upregulates genes of lipid biosynthesis in obese mice.

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Obstructive sleep apnea (OSA), a condition tightly linked to obesity, leads to chronic intermittent hypoxia (CIH) during sleep. There is emerging evidence that OSA is independently associated with insulin resistance and fatty liver disease, suggesting that OSA may affect hepatic lipid metabolism. To

Flexibility in anaerobic metabolism as revealed in a mutant of Chlamydomonas reinhardtii lacking hydrogenase activity.

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The green alga Chlamydomonas reinhardtii has a network of fermentation pathways that become active when cells acclimate to anoxia. Hydrogenase activity is an important component of this metabolism, and we have compared metabolic and regulatory responses that accompany anaerobiosis in wild-type C.

Mitochondrial Sirt3 supports cell proliferation by regulating glutamine-dependent oxidation in renal cell carcinoma.

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Clear cell renal carcinoma (RCC), the most common malignancy arising in the adult kidney, exhibits increased aerobic glycolysis and low mitochondrial respiration due to von Hippel-Lindau gene defects and constitutive hypoxia-inducible factor-α expression. Sirt3 is a major mitochondrial deacetylase

Contribution of Malate and Amino Acid Metabolism to Cytoplasmic pH Regulation in Hypoxic Maize Root Tips Studied Using Nuclear Magnetic Resonance Spectroscopy.

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(31)P-, (13)C-, and (15)N-nuclear magnetic resonance spectroscopy were used to determine the roles of malate, succinate, Ala, Asp, Glu, Gln, and gamma-aminobutyrate (GABA) in the energy metabolism and regulation of cytoplasmic pH in hypoxic maize (Zea mays L.) root tips. Nitrogen status was

Clinical, clinico-pathological and serological studies of Babesia ovis in experimentally infected sheep.

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Clinical, clinico-pathological and serological studies were performed in sheep experimentally infected with Babesia ovis. Acute babesiosis occurred in all the lambs infested with adult Rhipicephalus bursa ticks and in one lamb infested with the larvae. The rate of parasitaemia and the degree of

Malate decarboxylases: evolution and roles of NAD(P)-ME isoforms in species performing C(4) and C(3) photosynthesis.

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In the C(4) pathway of photosynthesis two types of malate decarboxylases release CO(2) in bundle sheath cells, NADP- and NAD-dependent malic enzyme (NADP-ME and NAD-ME), located in the chloroplasts and the mitochondria of these cells, respectively. The C(4) decarboxylases involved in C(4)

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