Results 11 to 20 of about 2,873 (175)

Evaluation of neopterin levels and kynurenine pathway in patients with acute coronary syndrome [PDF]

Acute and Critical Care, 2023
Background Coronary atherosclerosis is the leading cause of coronary artery disease. Several investigations have indicated that tear-sensitive plaques contain macrophages and T cells. Neopterin is an essential cellular immune response biomarker. The main
Ibrahim Kember, Sonia Sanajou, Bilge Kilicarslan, Gözde Girgin, Terken Baydar   +4 more
doaj   +1 more source

Enzymatic Synthesis of Four Stereoisomers of 7-0xo-biopterin and Determination of the Absolute Structure of Ichthyopterin

Pteridines, 1990
Enzymatic conversion of stereoisomers of biopterin (3a-d) to the 7-oxo-biopterin isomers (4a-d) was performed with a new pterin 7-oxidase extracted from carp skin.
Takikawa Shin Ichiro, Matsuura Sadao
doaj   +1 more source

Pteridines CV

Pteridines, 1995
Treatment of L-biopterin (I) with N,N-dimethyformamide dimethyl- (or diethyl)acetal and then with acetic anhydride in pyridine gave 1',2'-di-O-acetyl-N'-(N,N-dimethylaminomethylene)-L-biopterin (4), which was converted by the Mitsunobu reaction into 3 ...
Hanaya Tadashi, Torigoe Kiyoshi, Soranaka Kazuyuki, Yamamoto Horoshi, Qizhengt Yao, Pfleiderer Wolfgang   +5 more
doaj   +1 more source

An Efficient Synthesis of 2'-O-(β-D-Ribofuranosyl)biopterin

Pteridines, 2008
N2-(N,N-Dimethylaminomethylene)-3-[2-(4-nitrophenyl)ethyl]-1',2'-di-O-(trimethylsilyl)biopterin (4) was prepared from biopterin (1a, 86% overall yield) in 5 steps.
Hanaya Tadashi, Torigoe Kiyoshi, Soranaka Kazuyuki, Fujita Hiroshi, Pfleiderer Wolfgang, Yamamoto Hiroshi   +5 more
doaj   +1 more source

Correlation between Neopterin, Biopterin and Nitrite/Nitrate in Cerebrospinal Fluid in Child Patients with Neurological Diseases

Pteridines, 2003
Cerebrospinal fluid (CSF) neopterin been previously reported in various diseases. In this study CSF neopterin, biopterin, and nitrite/nitrate (NOx) Contents were measured and the correlation between them in child patients with various kinds of ...
Kawakami Yasuhiko, Sakamoto Mayuko, Shimada Ken-ichi, Noguchi Eiji, Kuwabara Kentaro, Fukui-Kobayashi Tomoko, Shirota Kazuhiko, Ogawa Ko-ichi, Fujita Takehisa, Fujino Osamu, Kojima Shuji, Fukunaga Yoshitaka   +11 more
doaj   +1 more source

Influence of an Aromatic Amino Acid Decarboxylase Inhibitor on GTP Cyclohydrolase I Activity in the Rat Brain

Pteridines, 1997
Based on the hypothesis that catecholamine decreases may cause increases in biopterin, we measured the GTP cyclohydrolase I(GTPCH-I) activity and biopterin content in the cerebral cortex, midbrain/diencephalon, cerebeilum, pons/medulla oblongata ...
Sakamoto Hideo, Fujita Ko, Kuzuya Hiroshi   +2 more
doaj   +1 more source

An Enzyme Immunoassay for Neopterin and Biopterin Using a Microtitre Plate Linked with N2-(3-Aminopropyl) Derivatives of Pteridines

Pteridines, 1990
A novel and sensitive enzyme immunoassay for neopterin and biopterin using a microtitre plate has been developed. The antiserum against neopterin or biopterin was incubated with samples prepared from human urine or rat tissues, and was placed in a well ...
Sugimoto Takashi, Ogiwara Shoji, Kiuchi Kazutoshi, Nagatsu Toshiharu, Sakai Masao, Nagatsu Ikuko, Fujita Keisuke   +6 more
doaj   +1 more source

Usefulness of serum biopterin as a predictive biomarker for childhood asthma control: A prospective cohort study

Allergology International, 2019
Background: Pteridines are metabolites of tetrahydrobiopterin, which serves as co-enzyme of nitric oxide synthase. We sought to investigate the usefulness of pteridines as biomarkers for childhood asthma control.
Saki Kasuga, Daijiro Kabata, Tomoko Sakaguchi, Satoshi Kudoh, Satsuki Nishigaki, Yusuke Higa, Shiori Fujikawa, Hiroko Fujitani, Ayumi Shintani, Takashi Hamazaki, Haruo Shintaku   +10 more
doaj   +1 more source

Plasma Levels of Neopterin and Biopterin in the Umbilical Vessels and the Maternal Vein

Pteridines, 2003
Tetrahydrobiopterin (BH4) is a highly bioactive pterin required for nitric oxide synthase and monooxygenases of aromatic amino acids, and is involved in the synthesis of nitric oxide, catecholamines and Serotonin.
Iwanaga Naoko, Yamamasu Seiichi, Tachibana Daisuke, Nishio Junko, Nakai Yuichiro, Shintaku Haruo, Imanaka Motoharu, Yamano Tsunekazu, Ishiko Osamu   +8 more
doaj   +1 more source

Measurement of Neopterin and Biopterin in Urine from Phenylketonuria Heterozygotes and Normal Controls

Pteridines, 1991
The effect of an oral load of phenylalanine (100 mg/kg body weight) on the levels of neopterin and biopterin in urine has been determined in 8 heterozygotes for classical phenylketonuria and 25 supposed normal controls. In basal conditions, neopterin and
Ruiz-Vázquez P., Bel Y., Garcia A. M., Cabello M. L., Dalmau J., Alós T., Catalá J. L., Ferré J.   +7 more
doaj   +1 more source