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Non-GFR Determinants of Low-Molecular-Weight Serum Protein Filtration Markers in the Elderly: AGES-Kidney and MESA-Kidney.

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Authors
Foster, Meredith C
Levey, Andrew S
Inker, Lesley A
Shafi, Tariq
Fan, Li
Gudnason, Vilmundur
Katz, Ronit
Mitchell, Gary F
Okparavero, Aghogho
Palsson, Runolfur
Post, Wendy S
Shlipak, Michael G
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Issue Date
2017-09

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Citation
Non-GFR Determinants of Low-Molecular-Weight Serum Protein Filtration Markers in the Elderly: AGES-Kidney and MESA-Kidney. 2017, 70 (3):406-414 Am. J. Kidney Dis.
Abstract
Studies in chronic kidney disease populations suggest that the non-glomerular filtration rate (GFR) determinants of serum levels of the low-molecular-weight protein filtration markers cystatin C, β2-microglobulin (B2M), and beta-trace protein (BTP) are less affected by age, sex, and ethnicity than those of creatinine.
Cross-sectional study.
Predominantly elderly participants selected from the Age, Gene/Environment Susceptibility Kidney Study (AGES-Kidney; N=683; mean [SD] age, 79 [4] years; GFR, 62 [17]mL/min/1.73 m(2)) and from the Multi-Ethnic Study of Atherosclerosis Kidney Study (MESA-Kidney; N=273; mean [SD] age, 70.5 [9] years; GFR, 73 [19]mL/min/1.73 m(2)).
Demographic and clinical factors hypothesized to be associated with conditions affecting non-GFR determinants of the filtration markers.
Measured GFRs and estimated GFRs (eGFRs) based on creatinine, cystatin C, B2M, and BTP levels (eGFRcr, eGFRcys, eGFRB2M, and eGFRBTP, respectively). Residual associations of factors with eGFR after accounting for measured GFR as the parameter of interest.
eGFRcys, eGFRB2M, and eGFRBTP had significantly less strong residual associations with age and sex than eGFRcr in both AGES-Kidney and MESA-Kidney and were not associated with ethnicity (black vs white) in MESA-Kidney. After adjusting for age, sex, and ethnicity, residual associations with most clinical factors were smaller than observed with age and sex. eGFRcys and eGFRB2M, but not eGFRBTP, had significant residual associations with C-reactive protein levels in both studies.
Small sample size may limit power to detect associations. Participants may be healthier than the general population.
Similar to previous studies in chronic kidney disease, in community-dwelling elders, cystatin C, B2M, and BTP levels are less affected than creatinine level by age and sex and are not affected by ethnicity. Both cystatin C and B2M levels may be affected by inflammation. These findings are important for the development and use of GFR estimating equations based on low-molecular-weight serum proteins throughout the range in GFRs.
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https://ac.els-cdn.com/S0272638617306686/1-s2.0-S0272638617306686-main.pdf?_tid=6a71a1e8-a1ff-11e7-90c2-00000aacb360&acdnat=1506350591_1709e01aff5d8dfb729819d695476010
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Archived with thanks to American journal of kidney diseases : the official journal of the National Kidney Foundation
ae974a485f413a2113503eed53cd6c53
10.1053/j.ajkd.2017.03.021
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