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Plasma mitochondrial DNA is elevated in obese type 2 diabetes mellitus patients and correlates positively with insulin resistance


Autoři: Larysa V. Yuzefovych aff001;  Viktor M. Pastukh aff001;  Mykhaylo V. Ruchko aff001;  Jon D. Simmons aff001;  William O. Richards aff002;  Lyudmila I. Rachek aff001
Působiště autorů: Department of Pharmacology, College of Medicine, University of South Alabama, Mobile, Alabama, United States of America aff001;  Department of Surgery, College of Medicine, University of South Alabama, Mobile, Alabama, United States of America aff002
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0222278

Souhrn

Cells damaged by mechanical or infectious injury release proinflammatory mitochondrial DNA (mtDNA) fragments into the circulation. We evaluated the relation between plasma levels of mtDNA fragments in obese type 2 diabetes mellitus (T2DM) patients and measures of chronic inflammation and insulin resistance. In 10 obese T2DM patients and 12 healthy control (HC) subjects, we measured levels of plasma cell-free mtDNA with quantitative real-time polymerase chain reaction, and mtDNA damage in skeletal muscle with quantitative alkaline Southern blot. Also, markers of systemic inflammation and oxidative stress in skeletal muscle were measured. Plasma levels of mtDNA fragments, mtDNA damage in skeletal muscle and plasma tumor necrosis factor α levels were greater in obese T2DM patients than HC subjects. Also, the abundance of plasma mtDNA fragments in obese T2DM patients levels positively correlated with insulin resistance. To the best of our knowledge, this is the first published evidence that elevated level of plasma mtDNA fragments is associated with mtDNA damage and oxidative stress in skeletal muscle and correlates with insulin resistance in obese T2DM patients. Plasma mtDNA may be a useful biomarker for predicting and monitoring insulin resistance in obese patients.

Klíčová slova:

Blood plasma – Inflammation – Mitochondria – Mitochondrial DNA – Obesity – Oxidative stress – Skeletal muscles


Zdroje

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