Shi ZH, Lin LL, Feng YX, Zheng YQ. Fistular onion stalk extract reduces NF-κB expression and TNF-α secretion in steatotic HepG2 cells.
Shijie Huaren Xiaohua Zazhi 2010;
18:3457-3461. [DOI:
10.11569/wcjd.v18.i32.3457]
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Abstract
AIM: To investigate the effects of fistular onion stalk extract on NF-κB expression and TNF-α secretion in steatotic HepG2 cells and to explore possible molecular mechanisms involved.
METHODS: HepG2 cells were induced with free fatty acids to create a cell model of hepatic steatosis. Intracellular lipid droplets were detected by oil red O staining. Cell proliferation was determined by MTT assay. The expression of NF-κB mRNA and protein was detected by RT-PCR and Western blot, respectively. NF-κB activity was detected by electrophoretic mobility shift assay (EMSA). TNF-α level was measured by ELISA.
RESULTS: After treatment with free fatty acids for 24 h, steatosis was successfully induced in HepG2 cells. Triglyceride (TG) content was significantly higher in model cells than in control cells (0.22 mmoL/L ± 0.03 mmoL/L vs 0.07 mmoL/L ± 0.05 mmoL/L, P < 0.01). Treatment with different doses of fistular onion stalk extract significantly improved cell proliferation (0.35 ± 0.04, 0.38 ± 0.03, 0.43 ± 0.07 vs 0.29 ± 0.07, all P < 0.05 or 0.01). The levels of NF-κB mRNA and protein expression (1.10 ± 0.06 vs 0.67 ± 0.06; 0.41 ± 0.03 vs 0.27 ± 0.04, P < 0.01) as well as TNF-α secretion (P < 0.01) were significantly higher in model cells than in control cells. Treatment with different doses of fistular onion stalk extract significantly reduced the levels of the above parameters (0.97 ± 0.05, 0.94 ± 0.09, 0.88 ± 0.08 vs 1.10 ± 0.06; 0.33 ± 0.06, 0.24 ± 0.06, 0.26 ± 0.05 vs 0.41 ± 0.03; 65.38 ng/L ± 9.55 ng/L, 59.93 ng/L ± 7.52 ng/L, 45.05 ng/L ± 9.22 ng/L vs 76.92 ng/L ± 8.40 ng/L, all P < 0.05 or 0.01).
CONCLUSION: Fistular onion stalk extract has significant protective effects against steatosis in HepG2 cells possibly by inhibiting NF-κB expression and reducing TNF-α secretion.
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