Hana Yamamoto, Nanami Shimomura and Yasushi Hasegawa

College of Environmental Technology, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan; 该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。 (H.Y.); 该Email地址已收到反垃圾邮件插件保护。要显示它您需要在浏览器中启用JavaScript。 (N.S.)

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Abstract: Pearl oysters have been extensively utilized in pearl production; however, most pearl oyster shells are discarded as industrial waste. In a previous study, we demonstrated that the intraperitoneal administration of pearl oyster shell-derived nacre extract (NE) prevented d-galactose-induced brain and skin aging. In this study, we examined the anti-aging effects of orally administered NE in senescence-accelerated mice (SAMP8). Feeding SAMP8 mice NE prevented the development of aging-related characteristics, such as coarse and dull hair, which are commonly observed in aged mice. Additionally, the NE mitigated muscle aging in SAMP8 mice, such as a decline in grip strength. Histological analysis of skeletal muscle revealed that the NE suppressed the expression of aging markers, cyclin-dependent kinase inhibitor 2A (p16) and cyclin-dependent kinase inhibitor 1 (p21), and increased the expression of sirtuin1 and peroxisome proliferator-activated receptor gamma coactivator 1 (PGC1)- α, which are involved in muscle synthesis. These findings suggest that the oral administration of NE suppresses skeletal muscle aging. Moreover, NE administration suppressed skin aging, including a decline in water content. Interestingly, oral administration of NE significantly extended the lifespan of SAMP8 mice, suggesting that its effectiveness as an anti-aging agent of various tissues including skeletal muscle, skin, and adipose tissue.

Keywords: skeletal muscle aging; nacre extract; lifespan extension; sarcopenia; skin aging

Citation: Yamamoto, H.; Shimomura,

N.; Hasegawa, Y. Oral Administration

of Nacre Extract from Pearl Oyster

Shells Has Anti-Aging Effects on Skin

and Muscle, and Extends the Lifespan

in SAMP8 Mice. Pharmaceuticals 2024,

17, 713. https://doi.org/

10.3390/ph17060713

Academic Editors: Mariia Shanaida,

Geir Bjørklund and Olha

Mykhailenko

Received: 16 May 2024

Revised: 28 May 2024

Accepted: 29 May 2024

Published: 31 May 2024