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L-ornithine-L-aspartate lowers plasma and cerebrospinal fluid ammonia and prevents brain edema in rats with acute liver failure.

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Brain edema sufficient to cause intracranial hypertension and brain herniation remains a major cause of mortality in acute liver failure (ALF). Studies in experimental animal models of ALF suggest a role for ammonia in the pathogenesis of both encephalopathy and brain edema in this condition. As

Brain edema in acute liver failure.

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Brain edema and consequent increase in intracranial pressure is a major complication of acute liver failure (ALF) and is a major cause of death in this condition. Rapid accumulation of ammonia in brain has been implicated in the pathogenesis of brain edema in ALF. Increased brain ammonia may cause

Efficacy of oral L-ornithine L-aspartate in cirrhotic patients with hyperammonemic hepatic encephalopathy.

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Hyperammonemia and associated cerebral edema cause neurological abnormalities in liver disease patients. Although only 15% of ammonia production originates in the colon, management strategies for hepatic encephalopathy (HE) have focused on reducing ammonia generation from the bowel rather than on

Safety, Tolerability and Pharmacokinetics of L-Ornithine Phenylacetate in Patients with Acute Liver Injury/Failure and Hyperammonemia.

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Cerebral edema remains a significant cause of morbidity and mortality in patients with acute liver failure (ALF) and has been linked to elevated blood ammonia levels. l-ornithine phenylacetate (OPA) may decrease ammonia by promoting its renal excretion as phenylacetylglutamine (PAGN), decreasing the

A new severe acute necrotizing pancreatitis model induced by L-ornithine in rats.

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OBJECTIVE Intraperitoneal administration of large doses of L-arginine is known to induce severe acute pancreatitis in rats. We therefore set out to determine whether metabolites of L-arginine (L-ornithine, L-citrulline, and nitric oxide) cause pancreatitis. METHODS The authors conducted an in vivo

Nitric oxide synthase inhibitor, nitro-iminoethyl-L-ornithine, reduces ischemia-reperfusion injury in rabbit skeletal muscle.

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Nitric oxide (NO), originally identified as the mediator of endothelial-dependent relaxation of vascular smooth muscle, is now known to also have cytotoxic effects under certain conditions. Thus, we have investigated the effects of inhibition of NO synthesis on ischemia/reperfusion injury in the

Experimental model of gyrate atrophy in animals.

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Intravitreal injection of L-ornithine hydrochloride in physiologic saline solution caused marked edema specifically in the pigment epithelium of Sprague-Dawley strain albino and Evans black hooded rats and rhesus and cynomologus monkeys. Swelling of the pigment epithelial cells, which was most

Enhancing effect of poly(amino acid)s on albumin uptake in human lung epithelial A549 cells.

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The clearance of albumin from the alveolar space is a critical process in the recovery from edema. In this study, we investigated the effect of poly(amino acid)s such as poly-l-ornithine (PLO) on albumin uptake in the cultured lung epithelial cell line A549. FITC-albumin uptake as well as cell

Alterations in expression of genes coding for key astrocytic proteins in acute liver failure.

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Cerebral edema and hepatic encephalopathy are major complications of acute liver failure. Brain herniation caused by increased intracranial pressure as a result of cell swelling is the major cause of death in this condition. Evidence available currently suggests that the rapid accumulation of

Ammonia increases paracellular permeability of rat brain endothelial cells by a mechanism encompassing oxidative/nitrosative stress and activation of matrix metalloproteinases.

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Ammonia is responsible for cerebral edema associated with acute liver failure, but the role of the vasogenic mechanism has been a matter of dispute. Here, we tested the hypothesis that ammonia induces changes in blood-brain barrier (BBB) permeability by a mechanism coupled to oxidative/nitrosative

[CLINICAL EFFICACY OF THE RECEPTOR BETA AND ALPHA BLOCKERS - CARVEDILOL AND ORNITHINE-ASPARTATE IN PATIENTS WITH CHD AND CHF COMBINED WITH ALCOHOLIC LIVER DISEASE].

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The aim of the paper is to study the clinical efficacy of carvedilol and ornithine-aspartate in the complex therapy (ACE inhibitors, diuretics, cardiac glycosides, nitrates indication), to assess their impact on quality of life, intracardiac hemodynamics, remodeling of the left (LV) and right

S-adenosylmethionine decarboxylase activity is decreased in the rat cortex after traumatic brain injury.

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S-Adenosyl-L-methionine decarboxylase (SAMdc) and L-ornithine decarboxylase (ODC) are major enzymes regulating polyamine synthesis. Following ischemia, putrescine content increases as a result of posttraumatic activation of ODC and inhibition of SAMdc. These alterations are thought to mediate edema

Effectiveness of arginase inhibitors against experimentally induced stroke.

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Stroke is a lethal disease, but it disables more than it kills. Stroke is the second leading cause of death and the most frequent cause of permanent disability in adults worldwide, with 90% of survivors having residual deficits. The pathophysiology of stroke is complex and involves a strong

Hepatic encephalopathy: cause and possible management with botanicals.

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Hepatic encephalopathy is a brain functional disorder, characterized by neuropsychiatric abnormalities with liver failure. High blood ammonia, causing glutamate neurotoxicity is the basic cause, finally leading to low-grade cerebral edema. Its manifestation is more likely in patients of sepsis,

Pathophysiology of hepatic encephalopathy: a new look at ammonia.

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Results of neuropathologic, spectroscopic, and neurochemical studies continue to confirm a major role for ammonia in the pathogenesis of the central nervous system complications of both acute and chronic liver failure. Damage to astrocytes characterized by cell swelling (acute liver failure) or

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