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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2015 > Volume 64 Number 4 > An Yun Guo1), Kwok Sui Leung1, 2), Parco Ming Fai Siu4), Jiang Hui Qin1), Simon Kwoon Ho Chow1), Ling Qin1, 2), Chi Yu Li1), and Wing Hoi Cheung1, 3)

Muscle mass, structural and functional investigations of senescence-accelerated mouse P8 (SAMP8)

An Yun Guo1), Kwok Sui Leung1, 2), Parco Ming Fai Siu4), Jiang Hui Qin1), Simon Kwoon Ho Chow1), Ling Qin1, 2), Chi Yu Li1), and Wing Hoi Cheung1, 3)
1) Department of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, P.R. China 2) Translational Medicine Research & Development Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, P.R. China 3)The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong Shenzhen Research Institute, Shenzhen, P.R. China 4)Department of Health Technology and Informatics, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong SAR, P.R. China
Abstract :

 Sarcopenia is an age-related systemic syndrome with progressive deterioration in skeletal muscle functions and loss in mass. Although the senescence-accelerated mouse P8 (SAMP8) was reported valid for muscular ageing research, there was no report on the details such as sarcopenia onset time. Therefore, this study was to investigate the change of muscle mass, structure and functions during the development of sarcopenia. Besides the average life span, muscle mass, structural and functional measurements were also studied. Male SAMP8 animals were examined at month 6, 7, 8, 9, and 10, in which the right gastrocnemius was isolated and tested for ex vivo contractile properties and fatigability while the contralateral one was harvested for muscle fiber cross-sectional area (FCSA) and typing assessments. Results showed that the peak of muscle mass appeared at month 7 and the onset of contractility decline was observed from month 8. Compared with month 8, most of the functional parameters at month 10 decreased significantly. Structurally, muscle fiber type IIA made up the largest proportion of the gastrocnemius, and the fiber size was found to peak at month 8. Based on the altered muscle mass, structural and functional outcomes, it was concluded that the onset of sarcopenia in SAMP8 animals was at month 8. SAMP8 animals at month 8 should be at pre-sarcopenia stage while month 10 at sarcopenia stage. It is confirmed that SAMP8 mouse can be used in sarcopenia research with established time line in this study.

Keywords :
contractile properties, muscle fiber typing, sarcopenia, senescence-accelerated mouse P8 (SAMP8)

Date Deposited : 07 Jan 2016 11:33

Last Modified : 07 Jan 2016 11:33

Official URL: http://https://www.jstage.jst.go.jp/browse/expanim/64/4/_contents

Volume 64, Number 4, October 2015 , ISSN 425–433

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