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Diabetologia

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01-09-2009 | Article

Mitochondrial DNA content in peripheral blood monocytes: relationship with age of diabetes onsetand diabetic complications

Authors: J. Wong, S. V. McLennan, L. Molyneaux, D. Min, S. M. Twigg, D. K. Yue

Published in: Diabetologia | Issue 9/2009

Abstract

Aims/hypothesis

We examined whether age of type 2 diabetes onset is related to mitochondrial DNA content in peripheral blood monocytes (PBMCs).

Methods

PBMCs were isolated from 65 patients with type 2 diabetes. To minimise age as a confounder, only patients aged ≥50 years were studied. Sample mitochondrial DNA (mtDNA) content was determined by amplification of the mitochondrial gene CYT-B (also known as MT-CYB) and adjusted for single-copy nuclear control genes (36B4 [also known as RPLPO] and GAPDH).

Results

Age of diabetes onset ranged from 25 to 69 years. There was a significant positive relationship between age of diabetes onset in quartiles and mtDNA content for the whole group (p = 0.02 for trend). When stratified by the presence of diabetes complications, a strong positive relationship was observed between age of diagnosis and mtDNA content for participants without diabetic complications (r = 0.7; p = 0.0002), but not for those with complications (r = −0.04; p = 0.8). Multivariate analysis confirmed age of onset and complication status as independent determinants. There was co-linearity between age of onset and disease duration, with similar relationships also seen between duration and mtDNA content.

Conclusions/interpretation

An earlier age of type 2 diabetes onset is associated with a lower PBMC mtDNA content, but only in patients without diabetes complications. This may reflect a differing biology of PBMC mtDNA in those with early-onset diabetes and those who are prone to complications. PBMC mtDNA depletion may accelerate diabetes onset; however the independent effect of diabetes duration remains to be evaluated.

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Title: Mitochondrial DNA content in peripheral blood monocytes: relationship with age of diabetes onsetand diabetic complications
Authors: J. Wong
S. V. McLennan
L. Molyneaux
D. Min
S. M. Twigg
D. K. Yue
Publication date: 01-09-2009
Publisher: Springer-Verlag
Published in: Diabetologia / Issue 9/2009
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-009-1424-6

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