ABSTRACT
Interaction of advanced glycation end products (AGEs) with the receptor for advanced
AGEs (RAGE) results in activation of nuclear factor kappa-B, release of cytokines,
expression of adhesion molecules, and induction of oxidative stress. Oxygen radicals
are involved in plaque rupture contributing to thromboembolism, resulting in acute
coronary syndrome (ACS). Thromboembolism and the direct effect of oxygen radicals
on myocardial cells cause cardiac damage that results in the release of cardiac troponin-I
(cTnI) and other biochemical markers. The soluble RAGE (sRAGE) compete with RAGE for
binding with AGE, thus functioning as a decoy and exerting a cytoprotective effect.
Low levels of serum sRAGE would allow unopposed serum AGE availability for binding
with RAGE, resulting in the generation of oxygen radicals and proinflammatory molecules
that have deleterious consequences and promote myocardial damage. sRAGE may stabilize
atherosclerotic plaques. It is hypothesized that low levels of sRAGE are associated
with high levels of serum cTnI in patients with ACS. The main objective of the study
was to determine whether low levels of serum sRAGE are associated with high levels
of serum cTnI in ACS patients. The serum levels of sRAGE and cTnI were measured in
36 patients with non-ST-segment elevation myocardial infarction (NSTEMI) and 30 control
subjects. Serum levels of sRAGE were lower in NSTEMI patients (802.56 ± 39.32 pg/mL)
as compared with control subjects (1311.43 ± 66.92 pg/mL). The levels of cTnI were
higher in NSTEMI patients (2.18 ± 0.33 μg/mL) as compared with control subjects (0.012 ± 0.001
μg/mL). Serum sRAGE levels were negatively correlated with the levels of cTnI. In
conclusion, the data suggest that low levels of serum sRAGE are associated with high
serum levels of cTnI and that there is a negative correlation between sRAGE and cTnI.
KEYWORDS
Soluble receptor for advanced glycation end products - cardiac troponin-I - non-ST-elevation
mycardial infarction - cytokines - oxidative stress - thromboembolism
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Kailash PrasadM.D. Ph.D.
Department of Physiology, College of Medicine, University of Saskatchewan
107 Wiggins Road, Saskatoon, Saskatchewan, Canada S7N 5E5
eMail: k.prasad@usask.ca