Results 51 to 60 of about 2,891 (172)
Influences of Catecholamine Contents on Tetrahydrobiopterin Metabolism
Pteridines, 1998 The influence of changes in catecholamine metabolism on tetrahydrobiopterin biosynthesis was investigated in cultured rat pheochromocytoma PC12 cells. The increase in the cellular dopamine content after treatment with the MAO-COMT inhibitor or dopamine ...
Kuzuya Hiroshi +2 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 +5 more
wiley +1 more source
Pteridines, 2012 Neopterin, as a non-conjugated pteridine, is synthesized from guanosine triphosphate and its production is upregulated upon the activation of cellular immune response.
Girgin Gözde +5 more
doaj +1 more source
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 +6 more
doaj +1 more source
Pteridines, 2008 The profiles of unconjugated pteridines such as neopterin and biopterin and of tryptophan metabolism change in many pathologic conditions such as rheumatoid arthritis, malignancies and autoimmune diseases and are related to the release of pro ...
Baydar Terken +6 more
doaj +1 more source
Pteridines, 1993 As a result to a microhial stimulus different defence systems are activated. Bacterial lipopolysaccharids (endotoxins) can lead to activation of the immune system in which phagocytic cells like macrophages.
Kullich W. +3 more
doaj +1 more source
Pterins as Sensors of Response to the Application of Fe3+-Dextran in Piglets
Sensors, 2010 The aim of the presented study was to assess the effect of a single administration of Fe3+-dextran on immune cell counts and pterin biomolecule production as novel sensors of the piglets' immune system activation, and to determine concentrations of ...
Klara Breinekova +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 +6 more
wiley +1 more source
Degeneration of Rat Retina is Paralleled by an Imbalance of the Redox Mechanism of Pteridines
Pteridines, 1996 The RCS rat suffers from a genetic degeneration of retinal cell We have examined the pattern of oxidized and reduced monapterin and biopterin in retinas from RCS retinas and controls.
Cremer-Bartels Gertrud
doaj +1 more source
The FEBS Journal, Volume 293, Issue 6, Page 1754-1770, March 2026.The Leishmania phosphatase PTP1, and possibly the genetically similar PTP2, interacts with the Leishmania transmembrane protein DUF21. When both ptp1 and ptp2 are knocked out of Leishmania (LdΔPTP1/2), the parasite can no longer survive without magnesium in vitro and has reduced viability in the host macrophage. Conversely, in duf21 knockout (LdΔDUF21),
Kayla Paulini +6 more
wiley +1 more source