l ornithine/necrosis

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Tumor necrosis factor augments the immunogenicity and the production of L-ornithine by peritoneal macrophages.

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The release of ornithine by macrophages and its correlation with their immunogenicity after treatment with recombinant human tumor necrosis factor-alpha (TNF) were analyzed. TNF was found to augment the capacity of peritoneal macrophages to convert 14C-labeled arginine into L-ornithine and to

Role of tumor necrosis factor and nitric oxide in the cytotoxic effects of Clostridium difficile toxin A and toxin B on macrophages.

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Clostridium difficile, the bacterium involved in antibiotic-associated colitis, produces two exotoxins, toxin A (TxA) and toxin B (TxB). Although these toxins are well recognized as being cytotoxic to several mammalian cell types, the mechanisms involved are not fully understood. The aim of the

Nitric oxide mediates tumor necrosis factor-alpha cytotoxicity in endothelial cells.

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Tumor necrosis factor alpha (TNF-alpha) exerts multiple actions on endothelial cells including among others the expression of pro-coagulant activity and adhesion molecules, and secretion of cytokines. We now show that TNF-alpha induces a time- and dose-dependent cytotoxic effect on cultured bovine

Tumor necrosis factor alpha modulates mitogenic responses of human cultured airway smooth muscle.

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Airway wall remodeling, including hyperplasia of airway smooth muscle, is regarded as an important contributor to airway hyperresponsiveness in asthmatic patients. The effects of the proinflammatory cytokine, tumor necrosis factor alpha (TNF alpha) on the mitogenic responses of human cultured airway

Possible role of nitric oxide in the development of L-2-chloropropionic acid-induced cerebellar granule cell necrosis.

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1. L-2-Chloropropionic acid (L-CPA) produces selective neuronal cell necrosis in rat cerebellum when administered orally at 750 mg kg-1 that is mediated in part through activation of N-methyl-D-aspartate (NMDA) receptors. Cerebellar granule cell death occurs between 30 and 36 h following L-CPA

Synthesis and characterization of alginate/poly-L-ornithine/alginate microcapsules for local immunosuppression.

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Alginate/poly-L-ornithine/alginate (APA) coherent microencapsulation, which provides an immunoselective and highly biocompatible membrane, creates a viable option for cellular or tissue transplantation. This study explored the potential of incorporating immunosuppressive drugs onto the capsule

l-ornithine activates Ca2+ signaling to exert its protective function on human proximal tubular cells.

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Oxidative stress and reactive oxygen species (ROS) generation can be influenced by G-protein coupled receptor (GPCR)-mediated regulation of intracellular Ca²⁺ ([Ca²⁺]_i) signaling. ROS production are much higher in proximal tubular (PT) cells; in addition, the lack of

L-ornithine L-aspartate in bouts of overt hepatic encephalopathy.

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High-quality data on the efficacy of L-ornithine L-aspartate (LOLA) in patients with cirrhosis and bouts of overt hepatic encephalopathy (OHE) are missing. We evaluated the efficacy of intravenous LOLA in the reversal of bouts of OHE in patients with cirrhosis. In this prospective, double-blind,

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

Tumor necrosis factor-induced activation of peritoneal macrophages is regulated by prostaglandin E2 and cAMP.

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Human rTNF-alpha stimulates the metabolism of murine peritoneal macrophages as demonstrated by an increased consumption of arginine and an increased release of L-ornithine. This TNF-mediated effect is augmented by several substances that raise the intracellular concentration of cAMP, including PGE2,

Islet-derived damage-associated molecular pattern molecule contributes to immune responses following microencapsulated neonatal porcine islet xenotransplantation in mice.

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Clinical allogeneic islet transplantation has become an attractive procedure for type 1 diabetes mellitus treatment. However, there is a severe shortage of human donors. Microencapsulated neonatal porcine islet (NPI) xenotransplantation may be an alternative transplantation procedure. Currently, the

[Retinal degeneration after intravitreal injection of ornithine. 2. Late change after administration].

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The influence of intravitreal injection of a small amount of l-ornithine hydrochloride in monkey eyes has been investigated morphologically. In a previous paper, the author demonstrated that acute selective damage was caused in the retinal pigment epithelium (RPE) by ornithine. This paper will

Effects of TNF-alpha on the production of vasoactive substances by cerebral endothelial and smooth muscle cells in culture.

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The effects of tumor necrosis factor-alpha (TNF-alpha) on the production of the vasoactive substances nitric oxide (NO) and endothelin-1 (ET-1) were investigated in cerebrovascular cells in culture. Bovine cerebral endothelial cells (BCEC) stained positively for NADPH-diaphorase/NO synthase activity

Role of angiotensin-(1-7) in gastroprotection against stress-induced ulcerogenesis. The involvement of mas receptor, nitric oxide, prostaglandins, and sensory neuropeptides.

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Angiotensin-(1-7) [Ang-(1-7)] is a major vasoactive metabolite of angiotensin I (Ang I), both being important components of the renin-angiotensin system (RAS). Ang-(1-7) acting via Mas receptor was documented in kidneys, heart, brain, and gastrointestinal (GI)-tract. We studied the gastroprotective

Timing of administration of dexamethasone or the nitric oxide synthase inhibitor, nitro-L-arginine methyl ester, is critical for effective treatment of ischaemia-reperfusion injury to rat skeletal muscle.

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1. The effects of the nitric oxide synthase (NOS) inhibitors, NG-nitro-L-arginine-methyl ester (L-NAME), nitroiminoethyl-L-ornithine and S. methylisothiourea on skeletal muscle survival following 2 h of tourniquet ischaemia and 24 h of reperfusion were compared with those of the anti-inflammatory

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