putrescine/hypoxia

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Putrescine enhancement of tolerance to root-zone hypoxia in Cucumis sativus: a role for increased nitrate reduction

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Cucumber (Cucumis sativus L.) plants were subjected to hypoxic stress with or without a pretreatment of putrescine (Put) to investigate whether nitrate reduction is involved in the enhancement effects of Put on tolerance to root-zone hypoxia. Both hypoxic stress and exogenous Put application

Putrescine transport in hypoxic rat main PASMCs is required for p38 MAP kinase activation.

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Hypoxic pulmonary vascular remodeling in rats is associated with increased polyamine transport in pulmonary artery smooth muscle cells (PASMCs). We therefore defined constitutive and hypoxia-induced polyamine transport properties of rat cultured PASMCs and determined the impact of polyamine

Acute hypoxia increases ornithine decarboxylase activity and polyamine concentrations in fetal rat brain.

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The cellular responses to hypoxia are poorly understood. To test the hypothesis that ornithine decarboxylase (ODC; L-ornithine carboxy-lyase; EC 4.1.1.17) activity and polyamine concentrations change in response to acute hypoxia, we performed the following studies. Pregnant Sprague-Dawley rats

Spermine is neuroprotective against anoxia and N-methyl-D-aspartate in hippocampal slices.

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Polyamines were implicated as either neurotoxic or neuroprotective in several models of stroke. Spermine augments the excitotoxicity mediated by the N-methyl-D-aspartate (NMDA) receptor because this receptor is activated at micromolar spermine concentrations. However, at higher concentrations,

γ-Aminobutyric Acid (GABA) Accumulation in Tea (Camellia sinensis L.) through the GABA Shunt and Polyamine Degradation Pathways under Anoxia.

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γ-Aminobutyric acid (GABA) is an important bioactive component of tea (Camellia sinensis) providing various health benefits. We studied GABA accumulation via the GABA shunt and polyamine degradation pathways under anoxia in tea leaves. Anoxia caused a ∼20-fold increment in GABA concentration,

Multiple polyamine transport pathways in cultured pulmonary artery smooth muscle cells: regulation by hypoxia.

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The polyamines putrescine (PUT), spermidine (SPD), and spermine (SPM) are a family of low molecular weight organic cations that play essential intracellular regulatory roles in cell growth and differentiation. Consistent with this important function, increases in cellular polyamine contents are

[Protective effect of putrescine on oleic acid-induced respiratory distress syndrome (RDS)].

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The effect of putrescine on oleic acid-induced RDS were studied in rat, it was found that preadministration of putrescine to rat with RDS significantly improved its hypoxemia, pulmonary edema and histologic injury; inhibited the leakage of protein from plasma; lowered increase of pulmonary lipid

Effect of hypoxia and reoxygenation on the activity of transglutaminase in brain of newborn piglets.

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The transglutaminase activity in five regions of the brain of newborn piglets was measured and the effects of hypoxia and posthypoxic period on this activity evaluated. Enzyme activity was measured in homogenates from cortex, hippocampus, striatum, thalamus and midbrain. The control activities were

[Effects of exogenous gamma-aminobutyric acid on polyamine metabolism of melon seedlings under hypoxia stress].

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Taking melon cultivar 'Xiyu No. 1 ' as test material, a hydroponic experiment was conducted to investigate the effects of exogenous gamma-aminobutyric acid (GABA) on the seedlings polyamine metabolism under hypoxia stress. Compared with the control in normoxic treatment, the seedlings under hypoxia

[Effects of D-arginine on polyamine content and anaerobic respiration metabolism of cucumber seedling roots under hypoxia stress].

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By the method of solution culture, this paper studied the effects of D-arginine on the seedling roots polyamine content and anaerobic respiration metabolism of two cucumber ( Cucumis Sativus L. ) cultivars Zhongnong No. 8 and Lübachun No. 4 differed in hypoxia tolerance. The results showed that

Polyamine biosynthesis and degradation are modulated by exogenous gamma-aminobutyric acid in root-zone hypoxia-stressed melon roots.

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We detected physiological change and gene expression related to PA metabolism in melon roots under controlled and hypoxic conditions with or without 5 mM GABA. Roots with hypoxia treatment showed a significant increase in glutamate decarboxylase (GAD) activity and endogenous GABA concentration.

Exogenous calcium affects nitrogen metabolism in root-zone hypoxia-stressed muskmelon roots and enhances short-term hypoxia tolerance.

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We investigated the effects of short-term root-zone hypoxic stress and exogenous calcium application or deficiency in an anoxic nutrient solution on nitrogen metabolism in the roots of the muskmelon cultivar Xiyu No. 1. Seedlings grown in the nutrient solution under hypoxic stress for 6d displayed

Cellular disposition of transported polyamines in hypoxic rat lung and pulmonary arteries.

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The polyamines putrescine, spermidine (SPD), and spermine are a family of low-molecular-weight organic cations essential for cell growth and differentiation and other aspects of signal transduction. Hypoxic pulmonary vascular remodeling is accompanied by depressed lung polyamine synthesis and

Polyamine content in pulmonary arteries from rats with monocrotaline-induced pulmonary hypertension.

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Based on the documented role of polyamines in regulation of cell growth and differentiation, we have proposed that these organic cations are essential for hypertrophic and hyperplastic responses of pulmonary vascular cells which underlie development of hypertensive pulmonary vascular disease. In

Role of ATP and sodium in polyamine transport in bovine pulmonary artery smooth cells.

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Increased polyamine transport may be a key mechanism driving elevations in lung cell polyamine content necessary for the development of chronic hypoxic pulmonary hypertension. Bovine pulmonary artery smooth muscle cells (PASMCs) in culture exhibit two carriers for polyamines, a non-selective one

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