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Pagina 1 a partire dal 30 risultati
Inflammatory action of 8-methoxypsoralen-spermine photoproduct (8-MOP-Spm-P(GFC)) and effects of various drugs on rat paw edema induced by 8-MOP-Spm-P(GFC).
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The photoproducts produced by irradiating 8-methoxypsoralen (8-MOP) in the presence of spermine (Spm) were fractionated using gel filtration chromatography (GFC) on a Sephadex G-25 column. As a result, two bands which were characterized by the effects on hyaluronidase activity were obtained. The
Effects of MDL 72527, a specific inhibitor of polyamine oxidase, on brain edema, ischemic injury volume, and tissue polyamine levels in rats after temporary middle cerebral artery occlusion.
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The possible effects of the polyamine interconversion pathway on tissue polyamine levels, brain edema formation, and ischemic injury volume were studied by using a selective irreversible inhibitor, MDL 72527, of the interconversion pathway enzyme, polyamine oxidase. In an intraluminal suture
Suppression of polyamine biosynthesis prevents monocrotaline-induced pulmonary edema and arterial medial thickening.
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Previous work in our laboratory has shown that the continuous administration of alpha-difluoromethylornithine (DFMO), a highly specific irreversible inhibitor of ornithine decarboxylase (ODC), which is the rate-limiting enzyme in polyamine biosynthesis, prevented the development of pulmonary
Blood brain barrier breakdown in brain edema following cold injury is mediated by microvascular polyamines.
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A focal freeze injury to rat cerebral cortex induces an early (less than 5 min) increase in brain ornithine decarboxylase activity and an accumulation of polyamines involving cerebral microvessels. This polyamine synthesis correlates with the abnormal increase in microvascular permeability,
Pyridoxal 5'-phosphate as an antidote for cyanide, spermine, gentamicin, and dopamine toxicity: an in vivo rat study.
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Pyridoxal 5'-phosphate (PLP), the active form of vitamin B6, readily forms complexes with a wide variety of potentially toxic substances, including cyanide (KCN), spermine (SPM), gentamicin (GM), and dopamine (DOP). The role of PLP as an antidote for these toxicants in vivo was studied. Rats were
Overexpression of spermidine/spermine N1-acetyltransferase or treatment with N1-N11-diethylnorspermine attenuates the severity of zinc-induced pancreatitis in mouse.
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Depletion of pancreatic intracellular polyamine pools has been observed in acute pancreatitis both in the animal models and in humans. In this study, the wild-type mice, polyamine catabolic enzyme spermidine/spermine N(1)-acetyltransferase overexpressing (SSAT mice) and SSAT-deficient mice were used
Spermine inhibition of monocyte activation and inflammation.
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The innate immune system functions as a defensive front line against pathogenic invasion, but the proinflammatory products of activated monocytes and macrophages (e.g., TNF and NO) can also injure normal cells. Anti-inflammatory mediators restrain the innate immune response and prevent excessive
Polyamines induce blood-brain barrier disruption and edema formation in the rat.
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Polyamines (PA) are derived from ornithine by the enzyme ornithine decarboxylase (ODC), which is activated very rapidly as acute and delayed responses to brain ischemia and trauma. Polyamines play a role in the disruption of the blood-brain barrier (BBB) in different pathological states. This study
Melatonin attenuates the changes in polyamine levels induced by systemic kainate administration in rat brains.
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Systemically administered kainate has been demonstrated to induce neuronal damage and changes of the levels of biochemical substances related to neurotoxicity. Polyamines are thought to be important in the generation of edema and neuronal cell loss associated with various type of excitotoxicity.
[Studies on the effects of thiamine deficiency on rat testes (author's transl)].
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Using male rats fed a thiamine deficient diet from the age of 35-days, an investigation was made of the effects on testicular tissue after 30 days of thiamine deficiency. It was found that: 1) In the thiamine deficient group, the seminiferous tubuli of rats having erections had atrophied and there
Polyamine synthesis blockade in monocrotaline-induced pneumotoxicity.
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Based on the documented regulatory role of polyamines in cell growth and differentiation, we have proposed that these organic cations are involved with the development of monocrotaline (MCT)-induced hypertensive pulmonary vascular disease. Two lines of evidence support this hypothesis: (1) MCT
Regional distribution of ornithine decarboxylase activity and polyamine levels in experimental cat brain tumors.
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Biosynthesis of the polyamines putrescine, spermidine, and spermine, and activation of the first key enzyme ornithine decarboxylase (ODC) are closely associated with cellular proliferation. In the present study, the distribution of ODC activity and polyamine levels was investigated for the first
Role of peripheral polyamines in the development of inflammatory pain.
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Polyamines (putrescine, spermidine and spermine) are aliphatic amines that are produced by the action of ornithine decarboxylase (ODC) in a rate-limiting and protein kinase C (PKC)-regulated step. Because high levels of polyamines are found in the synovial fluid of arthritic patients, the aim of the
Human neutrophil-pulmonary microvascular endothelial cell interactions in vitro: differential effects of nitric oxide vs. peroxynitrite.
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Sepsis-induced acute lung injury is characterized by activation and injury of pulmonary microvascular endothelial cells (PMVEC), increased neutrophil-PMVEC adhesion and migration, and trans-PMVEC high-protein edema. Inducible NO synthase (iNOS) inhibits septic murine neutrophil migration in vivo and
Effects of DL111-IT or combined with RU486 on uterine polyamines biosynthesis in rats during early gestation.
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DL111-IT, a non-hormonal contragestional agent, revealed synergistic effects in combination with mifepristone (RU486) in some species. The present study was undertaken to clarify the role of DL111-IT when used alone or plus RU486 on uterine polyamines biosynthesis, histologic alteration of decidual
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