title: Light/dark patterns of soluble vascular cell adhesion molecule-1 in relation to melatonin in patients with ST-segment elevation myocardial infarction.
abstract: Elevated levels of soluble cellular adhesion molecules have been reported in patients with acute coronary syndromes. Likewise, a relation between decreased nocturnal melatonin levels and coronary artery disease has been suggested. The aim of the present study was to investigate the day-night variations in the concentration of soluble vascular cell adhesion molecule-1 (sVCAM-1) in patients with ST-segment elevation myocardial infarction (STEMI) in relation to the light/dark melatonin pattern. Ninety consecutive patients with STEMI who were admitted to the Coronary Care Unit of our institution were studied. We also recruited 70 age- and gender-matched healthy normal subjects. Blood samples were drawn at 09:00 and 02:00 hr, while patients were at rest, for the assessment of sVCAM-1 and melatonin, which were measured using commercially available ELISA. In STEMI patients, melatonin concentrations maintained a diurnal variation, but the difference between nocturnal and diurnal levels was less than that in healthy subjects (P < 0.0001). In contrast to findings with melatonin, sVCAM-1 levels showed no diurnal variations in control subjects. In the STEMI group, however, sVCAM-1 concentration at 02:00 hr was significantly higher than that during the light phase (09:00 hr; 1391 +/- 38 versus 1200 +/- 43 ng/mL, P < 0.05). The results suggest that diurnal variations in endogenous sVCAM-1 production in STEMI patients might be related to an attenuated circadian secretion of melatonin.
authors: Department of Cardiology (Coronary Care Unit), Hospital Universitario de Canarias, Tenerife, Spain. adrvdg@hotmail.com
authors: Alberto
authors: A
authors: Dominguez-Rodriguez
authors: Pedro
authors: P
authors: Abreu-Gonzalez
authors: Martín J
authors: MJ
authors: Garcia-Gonzalez
authors: Sima
authors: S
authors: Samimi-Fard
authors: Juan Carlos
authors: JC
authors: Kaski
authors: Russel J
authors: RJ
authors: Reiter
mesh_terms: D000368:Aged; D002940:Circadian Rhythm / Q000502:physiology*; D003624:Darkness; D005260:Female; D006801:Humans; D008297:Male; D008550:Melatonin / Q000097:blood*; D009203:Myocardial Infarction / Q000097:blood*; D019010:Vascular Cell Adhesion Molecule-1 / Q000097:blood*
chemical_list: D019010:Vascular Cell Adhesion Molecule-1; D008550:Melatonin