L-carnitine affects osteoblast differentiation in NIH3T3 fibroblasts by the IGF-1/PI3K/Akt signalling pathway

Bioscience Trends
Pinglan GeJinxiang Han

Abstract

Fibroblasts in soft tissues are one of the progenitors of ectopic calcification. Our previous experiment found that the serum concentrations of small metabolite L-carnitine (LC) decreased in an ectopic calcification animal model, indicating LC is a potential calcification or mineralization inhibitor. In this study, we investigated the effect of LC on NIH3T3 fibroblast osteoblast differentiation, and explored its possible molecular mechanisms. Two concentrations of LC (10 μM and 100 μM) were added in Pi-induced NIH3T3 fibroblasts, cell proliferation was compared by MTT assays, osteoblast differentiation was evaluated by ALP activity, mineralized nodules formation, calcium deposition, and expressions of the osteogenic marker genes. Our results indicated that 10 μM LC increased the proliferation of NIH3T3 cells, but 100 μM LC slightly inhibited cell proliferation. 100 μM LC inhibits NIH3T3 differentiation as evidenced by decreases in ALP activity, mineralized nodule formation, calcium deposition, and down-regulation of the osteogenic marker genes ALP, Runx2 and OCN, meanwhile 10 μM of LC exerts an opposite effect that promotes NIH3T3 osteogenesis. Mechanistically, 100 μM LC significantly inhibits IGF-1/PI3K/Akt signalling, while 1...Continue Reading

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Citations

Mar 11, 2016·Drug Discoveries & Therapeutics·Chengzhi LiJinxiang Han
Apr 15, 2016·Analytical and Bioanalytical Chemistry·Gang YangJian Zhang
Nov 18, 2015·World Journal of Gastroenterology : WJG·Jian-Jun GaoWei Tang
Jun 11, 2020·Therapeutic Advances in Medical Oncology·Guanghan FanXiao Xu
Feb 16, 2017·Cell and Tissue Research·Koichi FujisawaIsao Sakaida
Aug 4, 2021·Journal of Medicinal Chemistry·Xiaoqing ZhangZhen Cheng

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