Comparison of the level of mitochondrial DNA A3243G mutation in esophageal epithelium and myocardium from individuals of very advanced age.

Abstract:

:The A3243G mutation, one of the changes of human mitochondrial DNA (mtDNA) that accumulates in cells during aging, is a useful marker for investigating the aging of cells. We measured the mutation level of the mtDNA A3243G mutation using DNAs from two different tissues (esophageal epithelium and myocardium) from advanced elderly individuals. The mean level of the A3243G mutation for the esophageal epithelium was 0.0063+/-0.0019, and that for the myocardium was 0.0098+/-0.0031. The mutation level in the myocardium was significantly higher than that in the esophageal epithelium, indicating that more mtDNA A3243G mutations accumulated in the myocardium than in the esophageal epithelium. Since the myocardium is static with respect to cell turnover, but in the esophageal epithelium renewal is very rapid, it is possible that the mtDNA A3243G mutation in the myocardium accumulates more rapidly than in the esophageal epithelium. This phenomenon may reflect the difference in the longevity of cells in each of these tissues and their different levels of oxidative stress.

journal_name

Exp Gerontol

journal_title

Experimental gerontology

authors

Harihara S,Nakamura K,Takubo K,Takeuchi F

doi

10.1016/s0531-5565(02)00020-7

keywords:

subject

Has Abstract

pub_date

2002-07-01 00:00:00

pages

917-23

issue

7

eissn

0531-5565

issn

1873-6815

pii

S0531556502000207

journal_volume

37

pub_type

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