homovanillic acid/neoplasms

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Vanilmandelic acid and homovanillic acid levels in patients with neural crest tumor: 24-hour urine collection versus random sample.

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Neuroblastoma is the most common solid tumor in childhood and is the most frequent neural crest tumor (NCT). More than 90% of the patients excrete high levels of vanilmandelic acid (VMA) and homovanillic acid (HVA) in the urine. Original biochemical methods for measuring these two metabolites of

Dietary flavonols contribute to false-positive elevation of homovanillic acid, a marker of catecholamine-secreting tumors.

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BACKGROUND Urinary homovanillic acid (HVA) measurement is used routinely as a marker of the first test for the screening of catecholamine-secreting tumors and dopamine metabolism, but generates a large number of false-positive results. With no guidelines for dietary restrictions prior to the test,

Establishment of a new cell line, VA-N-BR, from a primitive neuroblastoma tumor of the abdomen.

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An established cell line was derived from a neuroblastoma originating in the abdomen of a six year old male. This patient had increased urinary homovanillic acid on two occasions, and the tumor had a unique pattern of local peritoneal and hepatic dissemination but not distant spread. The cells were

[Clinical features of solid malignant tumors in childhood].

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The pathogenesis of pediatric malignant tumors is associated with congenital abnormalities. Oncogenes and antioncogenes are identified in some of these cases. Neuroblastoma arises from the adrenal medulla and sympathetic ganglia. Most neuroblastomas produce catecholamine. Urinary vanillylmandelic

Regional monoamine and metabolite levels in a feline brain tumor model.

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The presence of a brain tumor alters regional cerebral blood flow, oxygen consumption, and glucose utilization in adjacent and remote brain tissue, but its effect on brain neurotransmitter levels is unclear. In the present report, the levels of noradrenaline (NA), dopamine (DA), 5-hydroxytryptamine

The secretion of ibuprofen metabolites interferes with the capillary chromatography of urinary homovanillic acid and 4-hydroxy-3-methoxymandelic acid in neuroblastoma diagnosis.

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Neuroblastoma is the most common extracranial solid tumor in children. Abnormal secretion of catecholamines in tissues and body fluids allows for the differential diagnosis of neuroblastoma from other neoplasms and its distinction from non-neoplastic inflammatory diseases. This is achieved by

Sepsis-induced changes in behavioral stereotypy in rats; involvement of tumor necrosis factor-alpha, oxidative stress, and dopamine turnover.

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BACKGROUND Sepsis-associated encephalopathy (SAE) is defined as a diffuse or multifocal cerebral dysfunction that generally occurs early during severe sepsis. The complete pathophysiology of SAE is unknown, but several mechanisms including endotoxins, inflammatory mediators, the alteration of amino

Induction of apoptosis in leukemic cells by homovanillic acid derivative, capsaicin, through oxidative stress: implication of phosphorylation of p53 at Ser-15 residue by reactive oxygen species.

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Capsaicin (N-vanillyl-8-methyl-1-nonenamide) is a homovanillic acid derivative found in pungent fruits. Several investigators have reported the ability of capsaicin to inhibit events associated with the promotion of cancer. However, the effects of capsaicin on human leukemic cells have never been

Effects of a fluorinated pyrimidinedione anti-cancer drug, 5-fluoro-1-(tetrahydro-2-furanyl)-2,4-pyrimidinedione (FT), and related compounds on nigro-striatal dopaminergic neurons in the central nervous system.

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The cause of the side effects of 5-fluoro-1-(tetrahydro-2-furanyl)-2,4-pyrimidinedione (FT) on the central nervous system (CNS), and especially the extrapyramidal system were investigated by examining the effects of FT on pre- and post-synaptic functions of the dopaminergic system in comparison with

Stress at work alters serum brain-derived neurotrophic factor (BDNF) levels and plasma 3-methoxy-4-hydroxyphenylglycol (MHPG) levels in healthy volunteers: BDNF and MHPG as possible biological markers of mental stress?

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There is growing evidence that blood levels of brain-derived neurotrophic factor (BDNF) and catecholamine, and cytokines are related to not only to depressive, suicidal, and anxious states but also to depression-associated personality traits. Psychological job stress is well known to lead to

Urinary excretion of methylated catecholamine metabolites in a child with neuroblastoma maturing into ganglioneuroma.

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Neuroblastomas are malignant tumors derived embryonically from the neural crest. Biological diagnosis relies on assay of urinary excretion of homovanillic acid (HVA), vanillylmandelic acid (VMA), and dopamine (DA). Spontaneous regression of these neoplasms has been reported by numerous

Parkinson's disease: the effect of L-dopa therapy on urinary free catecholamines and metabolites.

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BACKGROUND L-dopa is an important antiparkinsonian drug. It is a precursor of dopamine and the other catecholamines. Potentially, administration of L-dopa could lead to increased urinary excretion of catecholamines and their metabolites to abnormal amounts. The current study aimed to determine these

Gamma Oryzanol Alleviates High-Fat Diet-Induced Anxiety-Like Behaviors Through Downregulation of Dopamine and Inflammation in the Amygdala of Mice.

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A high-fat diet (HFD) can induce obesity and metabolic disorders that are closely associated with cognitive impairments, and the progression of several psychiatric disorders such as anxiety. We have previously demonstrated the anxiolytic-like effect of Gamma oryzanol (GORZ) in chronic

Effects of N-ethyl,N-nitrosourea on monoamine concentrations and metabolizing enzymes in mouse brain regions.

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N-ethyl,N-nitrosourea is a well known alkylating agent and produces central nervous system-specific tumors in several laboratory animal species. In the present study, young male CD-1 mice were treated by i.p. injections of 0, 2, 8, or 32 mg/kg body weight N-ethyl,N-nitrosourea, twice a week for 3

The neuroprotective efficacy of alpha-crystallin against acute inflammation in mice.

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Acute inflammation activates macrophages or monocytes and subsequently releases several inflammatory cytokines and reactive oxygen and nitrogen species. These proinflammatory cytokines activate astrocytes and trigger neurodegenerative diseases. In this work, we chose to address the mechanistic

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