Characteristics of cardiac aging in C57BL/6 mice.

Zhao Cheng, Sachiko Ito, Naomi Nishio, Suganya Thanasegaran, He Fang, Ken-ichi Isobe

Department of Immunology, Nagoya University Graduate School of Medicine, 65 Turumai-cho, Showa-ku, Nagoya, Aichi, 466-8520, Japan.

Experimental gerontology 2013 Mar

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The specific processes that cause aging of the cardiac tissue remain elusive. C57BL/6 (B6) mice are commonly used for investigating age-related diseases in mammals. We thus sought to evaluate the cardiac aging process in B6 mice. Cardiac tissues from the newborn (B6 NB), 2month-old (B6 2M) and 21-27month-old B6 mice (B6 aged) were used for the investigation. Several age-related cellular processes were evaluated, including telomere shortening, changes in p53 and p16 expression, changes in mitochondria DNA expression and DNA deletion, and alteration of mitochondria. We found that the aging of the B6 mice cardiac tissue is associated with the maintenance of telomere length, increased expression of p53 and p16, mild changes in mitochondrial DNA expression but widespread DNA deletion, and significant alterations of the mitochondrial ultrastructure within the cardiac tissue. The results of our studies suggest that mitochondrial DNA deletions, which affect the mitochondrial ultrastructure, cytochrome C oxidase activity, and p53 expression, are significantly associated with cardiac aging and may be a source of age-related heart failure. Copyright © 2013 Elsevier Inc. All rights reserved.

Citation

Zhao Cheng, Sachiko Ito, Naomi Nishio, Suganya Thanasegaran, He Fang, Ken-ichi Isobe. Characteristics of cardiac aging in C57BL/6 mice. Experimental gerontology. 2013 Mar;48(3):341-8