Kidney disease
Is mildly reduced kidney function linked to inflammation?
Open access · cc by · source: Europe PMC
As kidney function declines, markers of inflammation and blood clotting rise steadily, and this is visible even in people without chronic kidney disease when kidney function is measured with cystatin C.
Study at a glance
- Design
- Cross-sectional — Baseline (single time point) analysis of fasting blood and urine samples from a US multi-ethnic cohort; partial correlations and linear regression of biomarkers on cystatin C and on eGFR.
- N
- N=6814 · 6,814 MESA participants; CRP, IL-6, fibrinogen and factor VIII were measured in everyone, but ICAM-1 only in 2,614 people and TNF-αR1 only in a random subset of 995.
- Population
- Adults aged 45 to 84 from six US communities who identified as white, African-American, Hispanic or Chinese-American and had no clinical cardiovascular disease.
- Outcome
- Levels of CRP, IL-6, TNF-α receptor 1, ICAM-1, fibrinogen and factor VIII in relation to kidney function measured by cystatin C and by creatinine-based eGFR.
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Key findings
About 10% of participants had chronic kidney disease. Cystatin C was significantly correlated with all six biomarkers both in people with and without chronic kidney disease, and average biomarker levels climbed across each fifth of the cystatin C distribution. Creatinine-based eGFR tracked most biomarkers only in people with chronic kidney disease; above that threshold it was linked only to TNF-α receptor 1, which had the strongest correlation of all. The cystatin C links with CRP, IL-6, ICAM-1 and factor VIII differed by race/ethnicity, being stronger in white participants.
Methodology
The researchers used baseline blood tests from 6,814 middle-aged and older adults in the Multi-Ethnic Study of Atherosclerosis, none of whom had heart disease. They measured kidney function two ways: the blood protein cystatin C and the standard creatinine-based estimated glomerular filtration rate (eGFR). They then tested how each measure related to six inflammatory and procoagulant biomarkers, adjusting for age, sex, ethnicity and body mass index, separately in people with and without chronic kidney disease (eGFR below 60).
Limitations
Because everything was measured at one time point, the study cannot say whether poorer kidney function causes inflammation or inflammation damages the kidneys. There was no gold-standard measured GFR, so the authors cannot fully rule out that cystatin C is tied to inflammation for reasons other than kidney filtration. TNF-α receptor 1 may simply rise because the kidney clears it, which is not the same as the body being more inflamed. The race/ethnicity differences may partly reflect assay or equation limitations rather than biology.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Cystatin C picks up links with inflammation at milder levels of kidney function than creatinine does.
How kidney function is measured changes the picture: in 6,814 MESA adults, cystatin C correlated with inflammatory and clotting markers (such as CRP, IL-6 and fibrinogen) even in people without CKD, whereas creatinine-based eGFR tracked most markers only once CKD was present.
Evidence for the claim as stated.
Cystatin C picks up links with inflammation at milder levels of kidney function than creatinine does.
How kidney function is measured changes the picture: in 6,814 MESA adults, cystatin C correlated with inflammatory and clotting markers (such as CRP, IL-6 and fibrinogen) even in people without CKD, whereas creatinine-based eGFR tracked most markers only once CKD was present.
Scope note — Cross-sectional with no measured GFR, so cystatin C might relate to inflammation for reasons other than filtration.
Limits the claim's scope: a different population, assay, or outcome.
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