Abstract
The process of preadipocytes differentiation plays a vital role in adipose tissue expansion and many factors are involved in this event. Cathepsin B (CTSB), secreted from lysosome, has been reported in regulating a variety of physiological processes. In this study, we demonstrated CTSB promotes lipid accumulation and adipogenic genes expression in porcine primary preadipocytes by degrading fibronectin (Fn), a key component of extracellular matrix. Lithium chloride (LiCl) is an activator of Wnt/β-catenin signaling through stabilizing β-catenin. We found that CTSB can relieve the anti-adipogenic effects of LiCl, indicating that CTSB could impact Wnt/β-catenin signaling pathway. Interestingly, Fn is an important target gene of Wnt/β-catenin. So we considered that CTSB promote preadipocytes differentiation by suppressing these two pathways.
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Acknowledgments
This work was funded by grants from the National Natural Science Foundation of China (No. 31272410), the National Basic Research Program of China (No. 2012CB124705), the Program for Innovative Research Team in the Northwest A&F University, and the National Swine Industry Technology System (No. CARS-36-04B).
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Zhang, ZY., Mai, Y., Yang, H. et al. CTSB promotes porcine preadipocytes differentiation by degrading fibronectin and attenuating the Wnt/β-catenin signaling pathway. Mol Cell Biochem 395, 53–64 (2014). https://doi.org/10.1007/s11010-014-2111-6
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DOI: https://doi.org/10.1007/s11010-014-2111-6