Association between Mitochondrial DNA Copy Number in Peripheral Blood and Incident CKD in the Atherosclerosis Risk in Communities Study

Journal of the American Society of Nephrology : JASN
Adrienne TinDan E Arking

Abstract

Mitochondrial dysfunction in kidney cells has been implicated in the pathogenesis of CKD. Mitochondrial DNA (mtDNA) copy number is a surrogate measure of mitochondrial function, and higher mtDNA copy number in peripheral blood has been associated with lower risk of two important risk factors for CKD progression, diabetes and microalbuminuria. We evaluated whether mtDNA copy number in peripheral blood associates with incident CKD in a population-based cohort of middle-aged adults. We estimated mtDNA copy number using 25 high-quality mitochondrial single nucleotide polymorphisms from the Affymetrix 6.0 array. Among 9058 participants, those with higher mtDNA copy number had a lower rate of prevalent diabetes and lower C-reactive protein levels and white blood cell counts. Baseline eGFR did not differ significantly by mtDNA copy number. Over a median follow-up of 19.6 years, 1490 participants developed CKD. Higher mtDNA copy number associated with lower risk of incident CKD (highest versus lowest quartile: hazard ratio 0.65; 95% confidence interval, 0.56 to 0.75; P<0.001) after adjusting for age, sex, and race. After adjusting for additional risk factors of CKD, including prevalent diabetes, hypertension, C-reactive protein level, ...Continue Reading

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