Chronic Exercise Modifies Age-Related Telomere Dynamics in a Tissue-Specific Fashion
| Autor: | Laila C. J. Lima, Mallory R. Marshall, Jenny Wang, Stephen M. Roth, Espen E. Spangenburg, Lisa M. Guth, Andrew T. Ludlow, Sarah Witkowski |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_specialty Telomerase Aging DNA Repair Physical Exertion Gene Expression Article Mice Internal medicine Gene expression Medicine Animals Tissue Distribution Telomeric Repeat Binding Protein 1 Muscle Skeletal Telomere Shortening DNA Primers biology Base Sequence business.industry Myocardium Skeletal muscle Anatomy Shelterin Enzyme assay Telomere medicine.anatomical_structure Endocrinology Liver biology.protein Female Plantaris muscle Geriatrics and Gerontology business |
| Popis: | We evaluated the impact of long-term exercise on telomere dynamics in wild-derived short telomere mice (CAST/Ei) over 1 year. We observed significant telomere shortening in liver and cardiac tissues in sedentary 1-year-old mice compared with young (8 weeks) baseline mice that were attenuated in exercised 1-year-old animals. In contrast, skeletal muscle exhibited significant telomere shortening in exercise mice compared with sedentary and young mice. Telomerase enzyme activity was increased in skeletal muscle of exercise compared with sedentary animals but was similar in cardiac and liver tissues. We observed significant age-related decreases in expression of telomere-related genes that were attenuated by exercise in cardiac and skeletal muscle but not liver. Protein content of TRF1 was significantly increased in plantaris muscle with age. In summary, long-term exercise altered telomere dynamics, slowing age-related decreases in telomere length in cardiac and liver tissue but contributing to shortening in exercised skeletal muscle. |
| Databáze: | OpenAIRE |
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