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I-Chien Wu, Cheng-Chieh Lin, Chin-San Liu, Chih-Cheng Hsu, Ching-Yu Chen, Chao A. Hsiung, Interrelations Between Mitochondrial DNA Copy Number and Inflammation in Older Adults, The Journals of Gerontology: Series A, Volume 72, Issue 7, July 2017, Pages 937–944, https://doi.org/10.1093/gerona/glx033
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Abstract
Interplays between inflammation and mitochondrial biology are reported. Here, we examined the cross-sectional interrelationships of mitochondrial DNA copy number (mtDNACN) and inflammation and their interaction with physical functioning.
A total of 1990 community-dwelling adults aged 65 years and older who were participating in the Healthy Aging Longitudinal Study in Taiwan underwent measurements of peripheral-blood leukocytes MtDNACN, multiple inflammatory markers, grip strength, and gait speed.
Principal components analysis revealed two inflammatory factors: factor 1 (high-sensitivity C-reactive protein [hs-CRP], white blood cell count, fibrinogen and interleukin-6 [IL-6]); factor 2 (tumor necrosis factor receptor 1, D-dimer and soluble interleukin-6 receptor). Participants with severe physical functioning impairment (low grip strength and gait speed) had higher (p < .05) levels of factor 1 and 2, but not mtDNACN, than did those with moderately impaired (low grip strength or gait speed) and normal physical functioning. MtDNACN was negatively related to factor 1 (r = −.221, p < .001) but not factor 2 (r = −.002, p = .938). Increased factor 1 was strongly associated with higher odds of physical functioning impairment in those with a low mtDNACN (adjusted odds ratios [OR] of moderate physical function impairment 1.21, 95% CI 1.01–1.44; adjusted OR of severe physical function impairment 1.52, 95% CI 1.25–1.85) but not in those with a high mtDNACN (p for interaction = .016).
A low mtDNACN was associated with an inflammation exhibiting elevated hs-CRP, IL-6, fibrinogen, and white blood cell count, and strengthened the association of this inflammation with physical functioning impairment.
