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The association between early neurological deterioration and whole blood purine concentration during acute stroke.

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Early neurological deterioration (END) is common after stroke. Prediction could identify patients requiring additional monitoring and intervention. Purines, breakdown products of adenosine triphosphate which accumulate during acute hypoxia, may reflect the subclinical presence of

[Cerebrospinal fluid concentrations of creatinine and purine metabolites determined by high performance liquid chromatography: preliminary report on head injury and stroke patients].

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A prospective high performance liquid chromatography (HPLC) study was performed in eighteen patients with head injury and stroke and four control volunteers to evaluate creatinine and purine metabolites concentration (adenosine, inosine, hypoxanthine, uric acid) in cerebrospinal fluid (CSF). The

Point-of-care measurements reveal release of purines into venous blood of stroke patients.

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Stroke is a leading cause of death and disability. Here, we examine whether point-of-care measurement of the purines, adenosine, inosine and hypoxanthine, which are downstream metabolites of ATP, has potential to assist the diagnosis of stroke. In a prospective observational study, patients who were

Stroke in purine nucleoside phosphorylase deficiency.

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The first documented case of cerebrovascular disease occurring in a 13-year-old girl with purine nucleoside phosphorylase deficiency is reported. This patient, the oldest known survivor with purine nucleoside phosphorylase deficiency, had previously experienced multiple sequential neurologic

An assessment of the possible protective effect of allopurinol in acute stroke.

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Allopurinol has been shown to have a protective effect on ischaemic tissue by the indirect prevention of excessive purine loss. This property was tested in the gerbil model of acute stroke. A total of 69 animals were pretreated with an intraperitoneal injection of either allopurinol (50 mg/kg) or

A novel purine analogue bearing nitrate ester prevents platelet activation by ROCK activity inhibition.

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Natural purines like ATP, ADP and adenosine have crucial roles in platelet physiology. This knowledge has been significant in drug development and today ADP receptor antagonists are widely used for prevention of thrombotic events following myocardial infarction and ischaemic stroke. Recent studies

Identification of malignant brain edema after hemispheric stroke by PET-imaging and microdialysis.

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Cerebral blood flow (CBF) and extent of irreversible tissue damage as well as the time course of extracellular concentration of amino acids, substrates of energy metabolism, and purine metabolites, intracranial pressure and tissue oxygen tension were assessed in 34 patients with large strokes

HPLC assay with UV detection for determination of RBC purine nucleotide concentrations and application for biomarker study in vivo.

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ATP and other purine nucleotides are important biomarkers for ischemia and may have considerable potential as targets for management of ischemic heart disease and stroke. The main objective of the study is to develop a rapid HPLC assay, which has adequate sensitivity and specificity for measuring

The clinical application of purine nucleosides as biomarkers of tissue Ischemia and hypoxia in humans in vivo.

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During periods of ischemia and hypoxia, intracellular adenosine triphosphate stores are rapidly depleted. Its metabolism results in release of purine nucleosides into the systemic circulation. While the potential of purine nucleosides as a biomarker of ischemia has long been recognized, this has

Administration of Uric Acid in the Emergency Treatment of Acute Ischemic Stroke.

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Oxidative stress is one of the main mechanisms implicated in the pathophysiology of inflammatory and neurodegenerative diseases of the central nervous system (CNS). Uric acid (UA) is the end product of purine catabolism in humans, and it is the main endogenous antioxidant in blood. Low circulating

Astrocytes affect the profile of purines released from cultured cortical neurons.

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Adenosine (ADO) is produced by cultured neurons and astrocytes, albeit by different pathways, during in vitro stroke models (Parkinson and Xiong [2004] J. Neurochem. 88:1305-1312). Expression of ecto-5' nucleotidase (e-N), the enzyme responsible for extracellular dephosphorylation of AMP to ADO, is

Purine uptake and release in rat C6 glioma cells: nucleoside transport and purine metabolism under ATP-depleting conditions.

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Adenosine, through activation of membrane-bound receptors, has been reported to have neuroprotective properties during strokes or seizures. The role of astrocytes in regulating brain interstitial adenosine levels has not been clearly defined. We have determined the nucleoside transporters present in

Endothelial cell Pannexin1 modulates severity of ischemic stroke by regulating cerebral inflammation and myogenic tone.

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Ischemic stroke is a leading cause of morbidity and mortality in the US; however, there currently exists only one effective acute pharmacological therapeutic intervention. Purinergic signaling has been shown to regulate vascular function and pathological processes, including inflammation and

Danger signals in stroke and their role on microglia activation after ischemia.

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Ischemic stroke is a major cause of death. Besides the direct damage resulting from oxygen and glucose deprivation, sterile inflammation plays a pivotal role in increasing cellular death. Damaged-associated molecular patterns (DAMPs) are passively released from dying cells and activate the innate

Effect of AIT-082, a purine analog, on working memory in normal and aged mice.

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Because working memory is the primary type of memory which is disrupted by Alzheimer's disease and stroke and during aging, any therapeutic drug for these conditions should improve and/or restore working memory. The win-shift memory paradigm has been shown to be an excellent model of working memory.

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