Ling JH, Wen YH, Zhou FM, Chen JM, Guo JR. Reproduction of an SMMC-7721 hepatocellular carcinoma cell model of endoplasmic reticulum stress induced autophagy: Impact on interventional effect of Smilax China L.
Shijie Huaren Xiaohua Zazhi 2020;
28:1009-1015. [DOI:
10.11569/wcjd.v28.i20.1009]
[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
Endoplasmic reticulum stress induced autophagy is a self-protective mechanism of liver cancer cells. The endoplasmic reticulum stress inducer dithiothreitol (DTT) can induce autophagy in liver cancer cells. Previous studies have confirmed that Smilax China L has the effect of inhibiting liver cancer cells, but it is not clear whether the endoplasmic reticulum stress induced autophagy of liver cancer cells affects the role of Smilax China L in inhibiting liver cancer cells.
AIM
To reproduce a SMMC-7721 liver cancer cell model of endoplasmic reticulum stress induced autophagy and to explore the impact of endoplasmic reticulum stress induced autophagy on the interventional effect of Smilax China L.
METHODS
Different doses of dithiothreitol (DTT; 0, 50, 200, and 500 μmol/L) were used to treat SMMC-7721 cells for 24 h. Cells were then observed for autophagosomes by transmission electron microscopy. The expression of microtubule-associated protein 1 light chain 3-Ⅱ (LC3-Ⅱ) protein in each group was determined by Western blot. The effect of smilax China L on the survival rate of model SMMC-7721 cells was observed by divividing SMM C-7721 cells into the following groups: Control, smilax China L (JGT) alone, and DTT + JGT groups. The control and JGT groups were given blank serum and smilax China L containing serum, respectively. The DTT + JGT group was treated with DTT and smilax China L medicated serum. The CCK-8 method was used to detect the cell survival rate.
RESULTS
Autophagosomes can be seen in the cytoplasm of DTT (50, 200, and 500 μmol/L) treated cells. As the concentration of DTT increased, the number of autophagosomes gradually increased, with a large number of auto-phagosomes visible in the DTT 500 μmol/L group. Compared with the control group, the expression of autophagy-related protein LC3-Ⅱ in DTT (50, 200, and 500 μmol/L) treated cells was significantly increased (P < 0.05 for all). Compared with the DTT 200 μmol/L group, the expression of LC3-Ⅱ protein in the DTT 500 μmol/L group was significantly increased (P < 0.05). The cell survival rates in the JGT and DTT + JGT groups were significantly lower than that of the control group (P < 0.05). The cell survival rate of the JGT group was significantly lower than that of the DTT + JGT group (P < 0.05).
CONCLUSION
DTT can induce autophagy in SMMC-7721 hepatocellular carcinoma cells. Smilax China L can inhibit the survival rate of SMMC-7721 cells, but DTT-induced autophagy can resist the inhibitory effect of Smilax China L on SMMC-7721 cell survival rate.
Collapse