Biomaterial Database

Arginine in thioacetamide-induced hepatogenic encephalopathy in rats: activation of enzymes of arginine metabolism to glutamate. 1986

J Albrecht, and W Hilgier

Two subsequent phases of hepatogenic encephalopathy (HE), the metabolic and precomatous phase, were produced in rats by thioacetamide treatment. Plasma and brain levels of arginine and its metabolites in the arginine-glutamate pathway, and activities of 2 brain enzymes of this pathway: arginase (L-arginine amidohydrolase, EC3521) and ornithine amino-transferase (OAT, ornithine-oxo-acid aminotransferase, EC26113) were measured in these rats. Plasma arginine sharply decreased in the metabolic phase and rose above control level in the precomatous phase, whereas ornithine and glutamate increased and urea decreased in both phases. Brain amino acids levels remained unchanged throughout, confirming earlier report of their insensitivity to external manipulation. Both brain enzymes showed a similar stepwise increase in their activities up to 150% the control level. The results are indicative of increased involvement of arginine as a precursor of amino acid neurotransmitters glutamate and GABA, with possible implication for the course of HE.

UI	MeSH Term	Description	Entries
D009952	Ornithine	An amino acid produced in the urea cycle by the splitting off of urea from arginine.	2,5-Diaminopentanoic Acid,Ornithine Dihydrochloride, (L)-Isomer,Ornithine Hydrochloride, (D)-Isomer,Ornithine Hydrochloride, (DL)-Isomer,Ornithine Hydrochloride, (L)-Isomer,Ornithine Monoacetate, (L)-Isomer,Ornithine Monohydrobromide, (L)-Isomer,Ornithine Monohydrochloride, (D)-Isomer,Ornithine Monohydrochloride, (DL)-Isomer,Ornithine Phosphate (1:1), (L)-Isomer,Ornithine Sulfate (1:1), (L)-Isomer,Ornithine, (D)-Isomer,Ornithine, (DL)-Isomer,Ornithine, (L)-Isomer,2,5 Diaminopentanoic Acid
D009953	Ornithine-Oxo-Acid Transaminase	A pyridoxal phosphate enzyme that catalyzes the formation of glutamate gamma-semialdehyde and an L-amino acid from L-ornithine and a 2-keto-acid. EC 2.6.1.13.	Ornithine Aminotransferase,Ornithine Transaminase,L-Ornithine-2-Oxo-Acid Aminotransferase,L-Ornithine-2-Oxoglutarate Aminotransferase,Ornithine Ketoacid Aminotransferase,Ornithine-2-Ketoglutarate Aminotransferase,Ornithine-Keto-Acid-Transaminase,Ornithine-Ketoacid-Transaminase,Pyrroline-5-Carboxylate Synthase,Aminotransferase, L-Ornithine-2-Oxo-Acid,Aminotransferase, L-Ornithine-2-Oxoglutarate,Aminotransferase, Ornithine,Aminotransferase, Ornithine Ketoacid,Aminotransferase, Ornithine-2-Ketoglutarate,Ketoacid Aminotransferase, Ornithine,L Ornithine 2 Oxo Acid Aminotransferase,L Ornithine 2 Oxoglutarate Aminotransferase,Ornithine 2 Ketoglutarate Aminotransferase,Ornithine Keto Acid Transaminase,Ornithine Ketoacid Transaminase,Ornithine Oxo Acid Transaminase,Pyrroline 5 Carboxylate Synthase,Synthase, Pyrroline-5-Carboxylate,Transaminase, Ornithine,Transaminase, Ornithine-Oxo-Acid
D011919	Rats, Inbred Strains	Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding.	August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D001921	Brain	The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.	Encephalon
D004789	Enzyme Activation	Conversion of an inactive form of an enzyme to one possessing metabolic activity. It includes 1, activation by ions (activators); 2, activation by cofactors (coenzymes); and 3, conversion of an enzyme precursor (proenzyme or zymogen) to an active enzyme.	Activation, Enzyme,Activations, Enzyme,Enzyme Activations
D005260	Female		Females
D005971	Glutamates	Derivatives of GLUTAMIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the 2-aminopentanedioic acid structure.	Glutamic Acid Derivatives,Glutamic Acids,Glutaminic Acids
D006501	Hepatic Encephalopathy	A syndrome characterized by central nervous system dysfunction in association with LIVER FAILURE, including portal-systemic shunts. Clinical features include lethargy and CONFUSION (frequently progressing to COMA); ASTERIXIS; NYSTAGMUS, PATHOLOGIC; brisk oculovestibular reflexes; decorticate and decerebrate posturing; MUSCLE SPASTICITY; and bilateral extensor plantar reflexes (see REFLEX, BABINSKI). ELECTROENCEPHALOGRAPHY may demonstrate triphasic waves. (From Adams et al., Principles of Neurology, 6th ed, pp1117-20; Plum & Posner, Diagnosis of Stupor and Coma, 3rd ed, p222-5)	Encephalopathy, Hepatic,Portosystemic Encephalopathy,Encephalopathy, Hepatocerebral,Encephalopathy, Portal-Systemic,Encephalopathy, Portosystemic,Fulminant Hepatic Failure with Cerebral Edema,Hepatic Coma,Hepatic Stupor,Hepatocerebral Encephalopathy,Portal-Systemic Encephalopathy,Coma, Hepatic,Comas, Hepatic,Encephalopathies, Hepatic,Encephalopathies, Hepatocerebral,Encephalopathies, Portal-Systemic,Encephalopathies, Portosystemic,Encephalopathy, Portal Systemic,Hepatic Comas,Hepatic Encephalopathies,Hepatic Stupors,Hepatocerebral Encephalopathies,Portal Systemic Encephalopathy,Portal-Systemic Encephalopathies,Portosystemic Encephalopathies,Stupor, Hepatic,Stupors, Hepatic
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001119	Arginase	A ureahydrolase that catalyzes the hydrolysis of arginine or canavanine to yield L-ornithine (ORNITHINE) and urea. Deficiency of this enzyme causes HYPERARGININEMIA. EC 3.5.3.1.	Arginase A1,Arginase A4,Hepatic Proliferation Inhibitor,Liver Immunoregulatory Protein,Liver-Derived Inhibitory Protein,Liver-Derived Lymphocyte Proliferation Inhibiting Protein,Immunoregulatory Protein, Liver,Inhibitor, Hepatic Proliferation,Inhibitory Protein, Liver-Derived,Liver Derived Inhibitory Protein,Liver Derived Lymphocyte Proliferation Inhibiting Protein,Proliferation Inhibitor, Hepatic,Protein, Liver Immunoregulatory,Protein, Liver-Derived Inhibitory