Results 41 to 50 of about 2,794 (172)

New aspects in biopterin biosynthesis in man [PDF]

FEBS Letters, 1981
Tetrahydrobiopterin is synthesized from guanosine triphosphate (GTP)in several enzymatic steps [1,2]. Details of the pathway of the biopterin biosynthesis in mammals are still unresolved [3]. In rat and human brain the rate-limiting enzyme was GTP cyclohydrolase [2], followed by D-erythro-7,8-dihydroneopterin triphosphate synthetase.
Häusermann, Max, Niederwieser, Alois, Curtius, Hans-Christoph, Ghisla, Sandro   +3 more
openaire   +3 more sources

Metabolomic and lipidomic signatures of Helicobacter pylori infection: Unveiling biochemical pathways associated with neurodegeneration

iMetaOmics, Volume 3, Issue 2, June 2026.
Our study employed an integrated lipidomics and metabolomics approach to elucidate Helicobacter pylori‐driven metabolic perturbations along the gut–brain axis. H. pylori infection was established in gastric epithelial (AGS) cells, and the resulting conditioned media (secretome) was collected and exposed to neuronal (IMR‐32) cells.
Meenakshi Kandpal, Tarun Prakash Verma, Siddharth Singh, Hamendra Parmar, Hem Chandra Jha   +4 more
wiley   +1 more source

Plasma Nitrate and Pteridine Levels in Experimental Bacteremia in Baboons

Pteridines, 1995
Using a recently developed model of bacterially induced sepsis in baboons, we studied the time courses of pteridine and nitrate levels in plasma with regard to the dose of Escherichia coli. Eight animals were given a 2 h infusion of 2X 10" Colony Forming
Strohmaier Wolfgang, Werner Ernst R., Redl Heinz, Wachter Helmut, Schlag Gunther   +4 more
doaj   +1 more source

Serum Biopterin as a Marker of Immune Activation in the Spontaneously Diabetic BB Rat

Pteridines, 1998
Tetrahydrobiopterin (BH4), is a pteridine product which is released by rodent macrophages and fibroblasts upon activation by cytokines. It has previously been reported as a potentially useful marker for monitoring immune activation during the prediabetic
Galloway Tamara, Braven Jim, Barley Jas, Rokos Hartmut, Wilkin Terence   +4 more
doaj   +1 more source

Skin Hyperpigmentation: An Under‐Recognized Dermatological Clue to Vitamin B12 Deficiency

Clinical Case Reports, Volume 14, Issue 5, May 2026.
Hyperpigmentation over the dorsal aspect of both hands, prominently involving the knuckles. ABSTRACT Cutaneous hyperpigmentation, an overlooked manifestation, can be an early sign of vitamin B12 deficiency. This case highlights symmetric pigmentation on the dorsum of hands and palms in a long‐term vegetarian.
Mahesh Mathur, Sumit Paudel, Sambidha Karki, Sandhya Regmi, Shilpa Maharjan, Nabita Bhattarai   +5 more
wiley   +1 more source

Exposure to Helicobacter pylori and Serum Kynurenine to Tryptophan Ratio in Patients with Gastric Cancer

Pteridines, 2010
In Helicobacter pylori seropositive individuals, the subsequent risk of non-cardia gastric cancer development is frequently attributed to the infection agent. Although the link between inflammation and gastric cancer is formally recognized, the molecular
Engin Ayse Basak, Karahalil Bensu, Karakaya Ali Esat, Engin Atilla   +3 more
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

Control of Melanogenesis In the Human Epidermis by the Redox-Status of Tetrahydrobiopterins

Pteridines, 1995
Activity of tyrosinase directly controls melanogenesis in the human epidermis. Recently, it has been shown that the biosynthesis and recycling of (6R)L-erythro 5,6,7,8 tetrahydrobiopterin (6-BH4) plays a central role in regulating the supply of L ...
Schallreuter-Wood Karin U., Wood John M.
doaj   +1 more source

Development of a cyclodextrin-electrokinetic chromatography methodology for the separation of biopterin enantiomers

Journal of Chromatography Open
This work presents the development of an analytical methodology based on the use of cyclodextrin-electrokinetic chromatography to achieve the enantiomeric separation of biopterin, a biologically relevant molecule that plays a significant role as a ...
S. Adámez-Rodríguez, M.L. Marina, M. Castro-Puyana   +2 more
doaj   +1 more source

Hippo Pathway Drives Durable Non‐Cell‐Autonomous Ferroptosis Resistance in Lung Cancer

Cancer Science, Volume 117, Issue 3, Page 683-694, March 2026.
YAP/TAZ, key effectors in lung cancer progression, paradoxically sensitize tumor cells to ferroptosis. This study reveals that YAP/TAZ‐low cells confer non‐cell‐autonomous, GCH1‐mediated durable ferroptosis resistance to neighboring YAP/TAZ‐high cells via a soluble factor, highlighting a Hippo pathway‐linked mechanism of tumor adaptation and survival ...
Mohamed Fathi Saleh, Akihiro Nita, Yudai Ohta, Aya Kobayashi, Hao Li, Yasuhisa Sakamoto, Toshiro Moroishi   +6 more
wiley   +1 more source