Title:Calpain Inhibitor Calpeptin Improves Pancreatic Fibrosis in Mice with Chronic
Pancreatitis by Inhibiting the Activation of Pancreatic Stellate Cells
Volume: 17
Author(s): Jie Shen, Wenqin Xiao, Guanzhao Zong, Pengli Song, Chuanyang Wang, Jingpiao Bao, Qi Peng, Zhu Mei, Jingjing Wang, Ruiyan Wang, Jing Jiang, Rong Wan, Jianbo Ni, Xingpeng Wang and Guoyong Hu*
Affiliation:
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Disease, Institute of Pancreatic Disease, Shanghai Jiao Tong University School of Medicine, Shanghai,
China
Keywords:
Calpeptin, Chronic pancreatitis, Pancreatic fibrosis, Pancreatic stellate cells, Calpain, TGF-β1/smad3 signaling pathway.
Abstract:
Background:
Pancreatic fibrosis is a hallmark feature of chronic pancreatitis (CP), resulting in persistent damage to the pancreas. The sustained activation of
pancreatic stellate cells (PSCs) plays a pivotal role in the progression of pancreatic fibrosis and is a major source of extracellular matrix (ECM)
deposition during pancreatic injury.
Methods:
Calpain is a calcium-independent lysosomal neutral cysteine endopeptidase and was found to be correlated to various fibrotic diseases. Studies
have revealed that calpeptin, a calpain inhibitor, can improve the fibrosis process of multiple organs. This study investigated the effect of the
calpain inhibitor, calpeptin, on fibrosis in experimental CP and activation of cultured PSCs in mice. CP was induced in mice by repeated injections
of cerulein for four weeks in vivo, and the activation process of mouse PSCs was isolated and cultured in vitro. Then, the inhibitory effect of
calpeptin on pancreatic fibrosis was confirmed based on the histological damage of CP, the expression of α-smooth muscle actin (α-SMA) and
collagen-Iα1(Col1α1), and the decrease in mRNA levels of calpain-1 and calpain-2.
Results:
In addition, it was revealed that calpeptin can inhibit the activation process of PSCs and induce significant PSCs apoptosis by downregulating the
expression of calpain-1, calpain-2 and TGF-β1, and the expression and phosphorylation of smad3 in vitro.
Conclusion:
These results suggest that the calpain inhibitor, calpeptin, plays a key role in the regulation of PSC activation by inhibiting the TGF-β1/smad3
signaling pathway, which supports the potential of calpeptin as an inhibitor of pancreatic fibrosis in mice by interfering with calpain.
