Results 1 to 10 of about 873 (118)

Dysregulation of tetrahydrobiopterin metabolism in myalgic encephalomyelitis/chronic fatigue syndrome by pentose phosphate pathway [PDF]

Journal of Central Nervous System Disease
Background Tetrahydrobiopterin (BH4) and its oxidized derivative dihydrobiopterin (BH2) were found to be strongly elevated in ME/CFS patients with orthostatic intolerance (ME + OI).
Sarojini Bulbule, Carl Gunnar Gottschalk, Molly E. Drosen, Daniel Peterson, Leggy A. Arnold, Avik Roy   +5 more
doaj   +2 more sources

Role of endothelial colony forming cells (ECFCs) Tetrahydrobiopterin (BH4) in determining ECFCs functionality in coronary artery disease (CAD) patients [PDF]

Scientific Reports, 2022
Nitric oxide (NO . ) is critical for functionality of endothelial colony forming cells (ECFCs). Dimerization of endothelial nitric oxide synthase (eNOS) is must to produce NO . and tetrahydrobiopterin (BH4) plays a crucial role in stabilizing this state.
Atanu Sen, Archna Singh, Ambuj Roy, Sujata Mohanty, Nitish Naik, Mani Kalaivani, Lakshmy Ramakrishnan   +6 more
doaj   +2 more sources

Garlic prevents the oxidizing and inflammatory effects of sepsis induced by bacterial lipopolysaccharide at the systemic and aortic level in the rat. Role of trpv1

Heliyon, 2023
Garlic (Allium sativum) possesses healing properties for diseases like systemic arterial hypertension, cancer and diabetes, among others. Its main component, allicin, binds to the Transient Receptor Potential Vanilloid Type 1 (TRPV1).
Juan Carlos Torres-Narváez, Israel Pérez-Torres, Leonardo del Valle-Mondragón, Vicente Castrejón-Tellez, Verónica Guarner-Lans, María Sánchez-Aguilar, Elvira Varela-López, Álvaro Vargas-González, Gustavo Pastelín-Hernández, Julieta Anabell Díaz-Juárez   +9 more
doaj   +1 more source

Impaired systemic tetrahydrobiopterin bioavailability and increased oxidized biopterins in pediatric falciparum malaria: association with disease severity. [PDF]

PLoS Pathogens, 2015
Decreased bioavailability of nitric oxide (NO) is a major contributor to the pathophysiology of severe falciparum malaria. Tetrahydrobiopterin (BH4) is an enzyme cofactor required for NO synthesis from L-arginine.
Matthew P Rubach, Jackson Mukemba, Salvatore Florence, Bert K Lopansri, Keith Hyland, Alicia D Volkheimer, Tsin W Yeo, Nicholas M Anstey, J Brice Weinberg, Esther D Mwaikambo, Donald L Granger   +10 more
doaj   +1 more source

The Nitric Oxide System in Peripheral Artery Disease: Connection with Oxidative Stress and Biopterins

Antioxidants, 2020
Peripheral artery disease (PAD) pathophysiology extends beyond hemodynamics to include other operating mechanisms, including endothelial dysfunction. Oxidative stress may be linked to endothelial dysfunction by reducing nitric oxide (NO) bioavailability.
Ahmed Ismaeel, Evlampia Papoutsi, Dimitrios Miserlis, Ramon Lavado, Gleb Haynatzki, George P. Casale, William T. Bohannon, Robert S. Smith, Jack Leigh Eidson, Robert Brumberg, Aaron Hayson, Jeffrey S. Kirk, Carlos Castro, Ian Sawicki, Charalambos Konstantinou, Luke P. Brewster, Iraklis I. Pipinos, Panagiotis Koutakis   +17 more
doaj   +1 more source

The Influence of 2,4-Diamino-6-Hydroxypyrimidine and Food Restriction on Tetrahydrobiopterin Metabolism, Neurotransmitters and Behaviour in the Rat

Pteridines, 1991
Administration of 2,4-diamino-6-hydroxypyrimidine (DAHP) in the diet of rats reduced total biopterins in plasma, brain and liver. The levels of dihydropteridine reductase (DHPR) and the rate of biopterin biosynthesis were unaffected.
Cox J., Armstrong R. A., Blair J. A.
doaj   +1 more source

Biopterin responsive phenylalanine hydroxylase deficiency [PDF]

Genetics in Medicine, 2004
Phenylketonuria (PKU) is an autosomal recessive disorder caused by mutations in the phenylalanine hydroxylase (PAH) gene. There have been more than 400 mutations identified in the PAH gene leading to variable degrees of deficiency in PAH activity, and consequently a wide spectrum of clinical severity.
Reuben, Matalon, Richard, Koch, Kimberlee, Michals-Matalon, Kathryn, Moseley, Sankar, Surendran, Stephen, Tyring, Heidi, Erlandsen, Alejandra, Gamez, Raymond C, Stevens, Anne, Romstad, Lisbeth B, Møller, Flemming, Guttler   +11 more
openaire   +2 more sources

Disorders of biopterin metabolism [PDF]

Journal of Inherited Metabolic Disease, 2009
SummaryDefects in the metabolism or regeneration of tetrahydrobiopterin (BH4) were initially discovered in patients with hyperphenylalaninaemia who had progressive neurological deterioration despite optimal metabolic control (malignant hyperphenylalaninaemia).
openaire   +2 more sources

Tetrahydro‐6‐biopterin is associated with tetrahydro‐7‐biopterin in primary murine mast cells [PDF]

FEBS Letters, 1992
Murine bone marrow‐derived mast cells proliferate in response to interleukin 3. In addition to 6‐biopterin, 7‐biopterin was identified in these cells by HPLC analysis of iodine oxidized extracts and by alkaline permanganate oxidation to the 6‐ and 7‐carboxylic acids. 7‐Biopterin comprised 31.9 (± 7.7)% of the total biopterin.
Ziegler, Irmgard, Hültner, Lothar
openaire   +2 more sources

Biopterin in Parkinson's disease. [PDF]

Journal of Neurology, Neurosurgery & Psychiatry, 1987
Tetrahydrobiopterin is an essential co-factor in the natural synthesis of dopamine. Oral tetrahydrobiopterin was given in small doses to four patients with early Parkinson's disease but had no discernible effect.
A P, Moore, P O, Behan, W, Jacobson, W L, Armarego   +3 more
openaire   +2 more sources