Age-related changes in tissue and plasma zinc levels: modulation by exogenously administered melatonin.

Melatonin (MEL) is synthesized mainly in the pineal gland and derived from 5-hydroxytryptophan (5-HTP). Zinc (Zn) is one of the most important trace elements in the body. Zn and MEL levels are changed with aging.

Serum levels of nitric oxide end products and interactions with lipoproteins in patients with coronary artery disease.

The purpose of this study was to examine whether the serum levels of nitric oxide end products and the ratio of nitrite to lipoproteins are valid instruments in the clinical follow-up of patients with coronary artery disease. 65 subjects were divided into three groups, including patients with coronary artery disease, silent coronary artery disease and controls. The serum nitrite level and also the ratio of nitrite to high-density lipoprotein were significantly different between the groups.

NO level and endothelial NO synthase gene polymorphism (Glu298Asp) in the patients with coronary artery disease from the Turkish population.

Nitric oxide is synthesized from L-arginine by endothelial nitric oxide synthase encoded by eNOS gene. This study was performed to investigate the relationship between the serum nitric oxide level and eNOS gene polymorphism in the Turkish population with angiographically diagnosed coronary artery disease (63.47 +/- 9.

Ratios of homocysteine and nitrite to high-density lipoprotein in coronary artery patients with the different degree of stenosis.

Although the interaction between Hcy, NO(2)(-) and vascular disease has been extensively studied, there are no data verifying their ratios to HDL-C in coronary artery disease (CAD). We examined whether Hcy/HDL-C and NO(2)(-)/HDL-C ratios correlated with the degree of stenosis in CAD. Also, TC/HDL-C and LDL-C/HDL-C ratios were evaluated in the same individuals.