1641-P: C-C Motif Chemokine Ligand 2 Promotes Myogenesis Recovery, Muscle Strength, and Muscle Performance In Vivo and Has Clinical Relevance for Muscle Performance in Human

Muscle mass decreases with aging, while the C-C motif chemokine ligand 2 (CCL2) increases with aging. In our previous study, CCL2 positively affects in vitro myogenesis. In this context, CCL2 can be considered a potential aging-promoting factor. To further confirm the relationship between muscle and CCL2, we sought to establish the role of CCL2 in vivo and in humans. It was divided into Dimethyl Sulfoxide (DMSO) control, dexamethasone (Dexa) intraperitoneal treatment group, and Dexa with the CCL2 treatment group. As a result, grip power and exercise endurance were reduced in the Dexa treatment group compared to the control group but recovered with the CCL2 treatment. In muscle mass, there was no significant difference in mass between groups. We examined the cross-sectional area distribution (CSA) with the tibialis anterior muscle. The Dexa treatment group was distributed between CSA 1000-3000 µm² and was left-shifted. However, the Dexa and CCL2 group was similar or slightly higher than the DMSO group; it was right-shifted and distributed in the 2000-5000 µm². In humans, the median value was 303.8 pg/ml in the no sarcopenia group and 321.7 pg/ml in the sarcopenia group. Subsequently, the CCL2 level was checked by dividing the groups into whether there was sarcopenia, low mass, low strength, or low speed. The CCL2 level was statistically significantly higher in the group showing low speed. In conclusion, CCL2 promotes myogenesis recovery, muscle strength, and muscle performance in vivo and has clinical relevance for muscle performance in humans. Disclosure E.Hong: None. E.Ha: None. J.Lee: None. Y.Choi: None. K.Lee: None. J.Won: None. M.Kwak: None. Funding Ministry of Education, Republic of Korea (2020R1I1A3073230)