Chen XQ, Peng B, Jiang HM, Zhang CX, Li HY, Li ZY. Effect of salvianolic acid B on NLRP3/caspase-1/GSDMD pyrolysis pathway in NASH cells.
Shijie Huaren Xiaohua Zazhi 2022;
30:69-76. [DOI:
10.11569/wcjd.v30.i2.69]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND
Numerous studies have proved that salvianolic acid B (Sal B) has a therapeutic effect on non-alcoholic fatty liver disease (NAFLD). Cell pyrolysis plays an important role in the onset of NAFLD and its progression to NASH. By studying the regulatory effect of Sal B on the main proteins related to cell pyrolysis in NASH, it was found that Sal B has the advantages of multiple approaches and multiple targets in the treatment of NAFLD.
AIM
To establish a non-alcoholic steatohepatitis (NASH) cell model by treating HepG2 cells with palmitic acid (PA), and explore the effect of Sal B on cell pyrolysis and the pyrolysis-related GSDMD/NLRP3/caspase-1 pathway.
METHODS
HepG2 cells in logarithmic growth phase were collected, and the optimal drug intervention concentration and intervention time for PA were assessed by MTT assay. The cells were randomly divided into a control group, a model group (PA), a treatment group (Sal B + PA), and a pyrolysis inhibitor group (VX-765 + PA). The cells of each group were stained with oil red O to observe the lipid accumulation in the cells under an inverted phase-contrast microscope. The cell supernatant was collected to measure the OD value with a microplate reader. The immunofluorescence probe DCFH-DA was used to determine the intracellular ROS content. The expression of interleukin 18 (IL-18) and interleukin 1β (IL-1β) in cell supernatant was determined by ELISA. The expression of NLRP3 and pyrolysis-related proteins caspase-1, GSDMD, and GSDMD-N was detected by Western blot.
RESULTS
Compared with the control group, the model group had obvious accumulation of lipids and ROS, increased secretion of inflammatory factors IL-1β and IL-18 (P < 0.05), and increased protein expression of NLRP3, caspase-1, GSDMD, and GSDMD-N (P < 0.05). Sal B or VX-765 inhibitor treatment can reverse the accumulation of lipids and ROS caused by PA, decreased the secretion of IL-1β and IL-18, and down-regulated the protein expression of NLRP3, caspase-1, GSDMD, and GSDMD-N (P < 0.05).
CONCLUSION
PA can induce pyrolysis of liver cells. Sal B can reduce inflammation and alleviate the progression of NASH by inhibiting the NLRP3/caspase-1/GSDMD pathway.
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