Light/dark patterns of soluble vascular cell adhesion molecule-1 in relation to melatonin in patients with ST-segment elevation myocardial infarction.
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.
Dominguez-Rodriguez
Alberto
A
Department of Cardiology (Coronary Care Unit), Hospital Universitario de Canarias, Tenerife, Spain. adrvdg@hotmail.com
Abreu-Gonzalez
Pedro
P
Garcia-Gonzalez
Martín J
MJ
Samimi-Fard
Sima
S
Kaski
Juan Carlos
JC
Reiter
Russel J
RJ
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*
D019010:Vascular Cell Adhesion Molecule-1; D008550:Melatonin