Relationship between renal function and circulating microparticles, soluble P-selectin and E-selectin levels in atrial fibrillation.
Atrial fibrillation (AF) and chronic kidney disease are closely related, and any associated risk of stroke and thromboembolism due to AF is increased by concurrent renal dysfunction. The mechanism(s) for this include abnormalities in platelets and endothelial cells. We hypothesized relationships between levels of circulating platelet microparticles (PMPs, defined by CD42b), soluble P selectin (both reflecting platelet activation), soluble E-selectin (reflecting endothelial activation) and endothelial/platelet microparticles (EPMPs, defined by CD31) with progressive renal dysfunction. Blood samples were obtained from 160 anticoagulated AF patients. Microparticles were measured by flow cytometry, soluble E and P selectin levels by ELISA. Renal function was determined by estimated glomerular filtration rate (eGFR). EPMP levels demonstrated a linear increased trend across quartiles of eGFR (p = 0.034) and CKD stage (p < 0.001), and correlated with eGFR and serum creatinine (p < 0.01). PMPs, P-selectin and E-selectin levels were not significantly different across groupings of renal dysfunction, and no significant correlations with eGFR were evident (p = 0.186, p = 0.561, p = 0.746 respectively). Stepwise multivariable regression analysis demonstrated that worsening renal function was an independent predictor of EPMP levels (p < 0.001). In well-anticoagulated AF patients, there is potential relationship between endothelial function (as judged by elevated EPMP levels, with no change in PMPs) and renal function. Other markers of prothombotic state or cellular activation (PMP, P-selectin and E-selectin levels) were not significantly different across the various degree of renal dysfunction. Renal function must be addressed when measuring EPMP levels.
University of Birmingham Institute of Cardiovascular Science, City Hospital, Dudley Road, Birmingham, UK.
Yee Cheng
YC
Lau
University of Birmingham Institute of Cardiovascular Science, City Hospital, Dudley Road, Birmingham, UK.|Cardiovascular Department, The Second Affiliated Hospital of Nanchang University, Nanchang, China.
Qinmei
Q
Xiong
University of Birmingham Institute of Cardiovascular Science, City Hospital, Dudley Road, Birmingham, UK.
Andrew D
AD
Blann
University of Birmingham Institute of Cardiovascular Science, City Hospital, Dudley Road, Birmingham, UK. g.y.h.lip@bham.ac.uk.
Gregory Y H
GY
Lip
D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000150:complications*; D015415:Biomarkers / Q000097:blood; D001792:Blood Platelets / Q000473:pathology; D055252:Cell-Derived Microparticles; D019040:E-Selectin / Q000097:blood; D042783:Endothelial Cells / Q000473:pathology; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D019007:P-Selectin / Q000097:blood; D051436:Renal Insufficiency, Chronic / Q000097:blood* / Q000473:pathology
D015415:Biomarkers; D019040:E-Selectin; D019007:P-Selectin
Atrial fibrillation; Chronic renal disease; Microparticles; Soluble E selectin; Soluble P selectin
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