• Journal of Ginseng Research
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• v.36 no.3
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• pp.248-255
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• 2012

Potential antioxidant effect of processed ginseng (sun ginseng, SG) on oxidative stress generated by tert-butyl hydroperoxide (t-BHP) was investigated in HepG2 cells. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and lactate dehydrogenase (LDH) leakage test demonstrated that SG dose-dependently prevents a loss of cell viability against t-BHP-induced oxidative stress. Also, SG treatment dose-dependently relieved the increment of activities of hepatic enzymes, such as aspartate aminotrasferase and alanine aminotransferase, and lipid peroxidation mediated by t-BHP treatment in HepG2 cells. SG increased the gene expression of antioxidant enzymes such as superoxide dismutase, catalase, and glutathione peroxidase. However, high dose of SG treatment caused decrease in mRNA level of glutathione peroxidase as compared to low dosage of SG-treated cells. The gene expression of glutathione reductase was found to be slightly increased by SG treatment. In addition, SG extract attributed its hepaprotective effect by inducing the mRNA level of bcl-2 and bcl-xL but reducing that of bax. But, the gene expression of bad showed no significant change in SG-treated HepG2 cells. These findings suggest that SG has hepatoprotective effect by showing reduction of LDH release, activities of hepatic enzymes and lipid peroxidation and regulating the gene expression of antioxidant enzymes and apoptosis-related molecules against oxdative stress caused by t-BHP in HepG2 cells.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.2
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• pp.329-332
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• 2002

We investigated the effect of Sarcodon aspratus extract on expression of cell cycle regulators. Methanol extract of Sarcodon aspratus showed a growth suppression on HepG2. As shown by western blot analysis, the expressions of cyclin A and Dl known as cell cycle regulators were decreased after treatment of Sarcodon aspratus extract. On the other hand, the expression of cyclin Bl was increased in the presence of Sarcodon aspratus extract. Furthermore, the expression of p53, a tumor supressor gene, and p27, a cell cycle dependent protein kinase inhibitor, were increased, whereas the expression of PCNA was decreased. In conclusion, our study suggests that growth inhibitory effect of Sardodon aspratus methanol extract on HepG2 is induced by cell cycle arrest in the Gl phase caused by decrease in cyclin A, Dl expressions and increases in p53, p27 expression.

• Herbal Formula Science
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• v.30 no.2
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• pp.67-83
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• 2022

Objectives : In this study, the anticancer activity of water extracts of three herbal medicine formulas, Bigihwan (BGH), Daechilgitang (DCGT) and Mokwhyangbinranghwan (MHBRH) listed in Donguibogam, was evaluated in HepG2 cells, a human hepatocellular carcinoma cell line. Methods : We investigated whether the cell viability of HepG2 cells was inhibited by the treatment of water extracts of three prescriptions, and whether their viability inhibitory effect was related to the induction of apoptosis. In addition, the role of autophagy on the induction of apoptosis by the treatment of these extracts was investigated. Results : The anticancer activity of the three water extracts on HepG2 cells was due to induction of apoptosis, not necrosis. Among them, BGH activated the caspase-dependent intrinsic apoptosis pathway associated with mitochondrial dysfunction. However, autophagy was induced more than 2-fold in DCGT-treated HepG2 cells, and the anticancer activity of DCGT was enhanced 1.5-fold in the presence of an autophagy inhibitor, but was attenuated in BGH and MHBRH-treated cells. Conclusion : The results of this study indicate that DCGT-induced autophagy was involved in the inhibition of apoptosis, whereas autophagy by BGH and MHBRH was related to induction of apoptosis.

• Applied Biological Chemistry
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• v.51 no.2
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• pp.129-135
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• 2008

Berberine is an isoquinoline alkaloid used in traditional Chinese medicine and has been isolated from a variety of plants, such as Coptis chinensis and Phellodendron amurense. It has a wide spectrum of clinical applications such as in anti-tumor, anti-microbial, and anti-inflammatory activities. However, it is still unknown that berberine related with reactive oxygen species (ROS)-mediated apoptosis pathway in human hepatoma HepG2 cells. In the present study, we are examined the molecular mechanism of ROS- and p38 MAP kinase-mediated apoptosis by berberine in HepG2 cells. Berberine increased cytotoxicity effects by time- and does-dependent manner. $LD_{50}$ was detected 50 ${\mu}M$ at 48h of exposure to berberine. Nuclei cleavage and apoptotic DNA fragmentation were observed in cells treated with 50 ${\mu}M$ of berberine for 48h. Moreover, berberine induced the activating of caspase-3, p53, p38 and Bax expression, whereas the expression of anti-apoptotic signaling pathways, Bcl-2, was decreased. Additionally, berberine-treated cells had an increased level of generation of ROS and nitric oxide (NO). These results indicated that berberine induces apoptosis of HepG2 cells may be mediated oxidative injury acts as an early and upstream change, triggers mitochondrial dysfunction, Bcl-2 and Bax modulation, p38 and p53 activation, caspase-3 activation, and consequent leading to apoptosis.

• BMB Reports
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• v.29 no.1
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• pp.73-80
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• 1996

The effect of albumin on phosphatidylcholine (PC) metabolism in Hep-G2, 3T3-H.ras, and 3T3 cells pre-labelled with [Me-$^3H$]choline was studied. The [$^3H$]choline was more efficiently taken up and incorporated into cellular phospholipids in 3T3-H.ras cells than in Hep-G2 and 3T3 cells. In each of the three cell lines, most of the [$^3H$]choline metabolized into the phospholipids was incorporated into PC and only minor was incorporated into lysophosphatidylcholine (LPC). Bovine serum albumin stimulated the release of [$^3H$]LPC and [$^3H$]PC from each of the three cell lines pre-labelled with [$^3H$]choline. [$^3H$]PC was also released in the absence of albumin but [$^3H$]LPC was not. The efficiency of LPC secretion represented as the proportion of medium [$^3H$]LPC to cellular [$^3H$]choline lipid during a chase period is approximately 9 to 14 times greater in 3T3 cells compared with the transformed 3T3-H.ras and Hep-G2 cells. A similar comparison of published data for rat hepatocytes with Hep-G2 shows secretion to be 35~75 times greater from the rat hepatocytes than from Hep-G2. Also, PC secretion from 3T3 cells was 1.6 times more effective than from 3T3-H.ras, whereas rat hepatocytes secrete PC 2.8~3.8 times more effectively than does Hep-G2. The measurement of specific radioactivity of cellular PC in pre-labelled 3T3 cells showed it to be similar to that of the secreted PC. However, the specific radioactivity of secreted LPC was markedly lower than that of the cellular PC, which suggests that LPC is being secreted from a PC pool distinct from that used for PC secretion.

• The Journal of Internal Korean Medicine
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• v.38 no.3
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• pp.367-375
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• 2017

Objective: To investigate the effect of Artemisiae Iwayomogii Herba, Curcumae Radix, and Aurantii Fructus Immaturus complex extract (ACA) on dyslipidemia-related factor expression and anti-oxidation in HepG2 cells. Method: After treatment with ACA in the HepG2 cells, DPPH, ABTS radical scavenging activity, ROS production, and glutathione (GSH) production were measured. The free fatty acid, lipid peroxidation (MDA), ACAT1, and HMG-CoA reductase mRNA expression were measured in the HepG2 cells after treatment with ACA. Results: 1. DPPH, ABTS radical scavenging activity increased in an ACA concentration-dependent manner. 2. ACA significantly decreased ROS production in comparison to the control group. 3. ACA significantly increased glutathione production. 4. ACA significantly decreased free fatty acid and lipid peroxidation (MDA) in the HepG2 cells. 5. ACA decreased the mRNA expression of ACAT1 and HMG-CoA reductase. Conclusion: These results suggest that Artemisiae Iwayomogii Herba, Curcumae Radix, and Aurantii Fructus Immaturus complex extract (ACA) inhibits dyslipidemia-related factor expression and that it is effective in anti-oxidation. A future in vivo experiment with ACA is needed to investigate the effect on anti-dyslipidemia. It is expected that ACA is effective in anti-dyslipidemia and applied to cardiovascular disease, ischemic heart disease, stroke, etc.

• Herbal Formula Science
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• v.13 no.2
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• pp.111-123
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• 2005

The purpose of this study was to investigate the anticancer effects of Caesalpiniae Lignum (Somok) on HepG2 cells, a human liver cancer cell line. To study the cytotoxic effect of Caesalpiniae Lignum methanol extract (CL-MeOH) on HepG2 cells, the cells were treated with various concentrations of CL-MeOH and then cell viability was determined by XTT reduction method and trypan blue exclusion assay. CL-MeOH reduced proliferation of HepG2 cells in a dose-dependent manner. To confirm the induction of apoptosis, HepG2 cells were treated with various concentrations of CL-MeOH. The activation of caspase 3 and the cleavage of poly ADP-ribose polymerase (PARP), a substrate for caspase-3 and a typical sign of apoptosis, was examined by western blot analysis. CL-MeOH decreased procaspase 3 level in a dose-dependent manner and induced the clevage of PARP at concentration> $200{\mu}/ml$. Mitogen-activated protein (MAP) kinase signaling cascades are multi-functional signaling networks that influence cell growth, differentiation, apoptosis, and cellular responses to stress. CL-MeOH-induced MAPK activation was examined by Western blot for phosphorylated ERK, p38 and JNK. CL-MeOH significantly increased p38 phosphorylation and JNK phosphorylation in a dose-dependent manner. Inhibition of p38 function using the selective inhibitor SB20358O results in inhibition of apoptosis by CL-MeOH. These results suggest that CL-MeOH-induced apoptosis is MAP kinase-dependent apoptoric pathway. These results suggest that CL-MeOH is potentially useful as a chemotherapeutic agent in human liver cancer.

• Korean Journal of Food Science and Technology
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• v.54 no.4
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• pp.398-402
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• 2022

Black chokeberry (Aronia melanocarpa), a rich source of polyphenols, exerts hypocholesterolemic effects. However, little is known about its effects on the regulation of the hepatic cholesterol metabolism and the underlying mechanisms. In the present study, the effects of polyphenol-rich black chokeberry extract (CBE) on hepatic cholesterol metabolism were investigated by measuring the expression of genes involved in the absorption, de novo synthesis, and efflux of cholesterol in HepG2 cells. There was a significant reduction in the expression levels of genes involved in cholesterol metabolism, the low-density lipoprotein receptor, 3-hydroxy-3-methylglutaryl coenzyme A reductase, and sterol regulatory element-binding protein 2, in CBE-treated HepG2 cells. Meanwhile, CBE increased the expression levels of genes involved in cholesterol and bile acid efflux. The expression levels of mitochondrial fatty acid oxidation genes increased, whereas those of lipogenic genes decreased following CBE treatment. These data suggest that the consumption of black chokeberry may be beneficial for the prevention of hypercholesterolemia.

• The Journal of Internal Korean Medicine
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• v.25 no.1
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• pp.28-45
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• 2004

Objectives : The main purpose of this study is to evaluate the effect of Injinchunggan-tang on $TNF-{\alpha}$ signal transmission system. Materials and Methods : We analyzed the following with quantitative RT-PCR method; the effect of Injinchunggan-tang on secretion of $TNF-\alpha$ mRNA/protein and stability, the effect on gene revelation that consists of signal transmission system (TRAIL, NIK, A20, TRADD, RAIDD, RIP TNFR-I, TNFR-II, TRAF1, TRAF2, FADD), the one on activation of p38, Erk1/2 MAPK and the rate of nuclear $NF-{\kappa}B/cytosolic\;NF-{\kappa}B$ in HepG2 cell. We also analyzed the inhibitory effect of Injinchunggan-tang on the apoptosis of HepG2 cell that $TNF-{\alpha}$ induces and the $NF-{\kappa}B$ restraint effected by transfection of $I{\kappa}B{\Delta}N$ through tryphan blue exclusion assay. Results : Injinchunggan-tang prohibits revelation of $TNF-{\alpha}$ mRNA in HepG2 cell and the creation of protein. However, it has no effect on the stability of $TNF-{\alpha}$ mRNA. While it did not have any effect on the generation of TRAIL, NIK, A20, TRADD, RAIDD and RIP genes, Injinchunggan-tang reduces the revelation of TNFR-I, TNFR-II, TRAF1, TRAF2 and FADD genes. It has been confirmed that Injinchunggan-tang restraints the revelation of $TNF-{\alpha}$ mRNA that is promoted by ethanol, acetaldehyde, lipopolysaccharide, in proportion to the treatment density and time. It activated $NF-{\kappa}B$ of HepG2 cell and promoted activation of $NF-{\kappa}B$ that is occurred by $TNF-{\alpha}$. It has been observed that the restraint effect against the $TNF-{\alpha}$ inducing apoptosis is lost when it is intercepted the function of $NF-{\kappa}B$ in HepG2 cell. Conclusion: It has been confirmed that Injinchunggan-tang has restraining effect against the revelation of $TNF-{\alpha}$ and mRNA that is constituent element of TNF-a signal transmission system. It also has been revealed that it restraints the activation of p38, Erk1/2 by $TNF-{\alpha}$. Through this prohibiting effect, it is inferred that it restraints signal transmission among various cells that are related to inflammation reaction. Meanwhile, Injinchunggan-tang protects liver cell from apoptosis that is caused by $TNF-{\alpha}$, by maintaining the activating function for $NF-{\kappa}B$.

• Journal of Life Science
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• v.29 no.10
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• pp.1144-1151
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• 2019

Non-alcoholic fatty liver disease (NAFLD) is a chronic liver disease associated with various metabolic syndromes, such as obesity, dyslipidemia, hypertension, and diabetes. Cudrania tricuspidata is a medicinal plant distributed widely in Asia and has been used in clinical practice to treat various diseases. The aim of this study is to determine the lipid-lowering effects of C. tricuspidata fruit extract (CTE) using a cell model induced by free fatty acids (FFAs). HepG2 cells were exposed to 1mM FFAs (palmitic acid:oleic acid = 2:1) for 24 hr to simulate the conditions of NAFLD in vitro. CTE attenuated the increases of lipid accumulation, intracellular triglyceride, and cholesterol content and inhibited 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) activity in the HepG2 cells in a dose-dependent manner. Also, CTE inhibited the protein expression of lipogenesis-related genes, such as sterol regulatory element-binding protein-1/-2 (SREBP-1/-2), fatty acid synthase (FAS), and stearoyl CoA desaturase-1 (SCD-1) in FFAs-induced lipid accumulation in HepG2 cells. In addition, CTE-induced adenosine monophosphate-activated protein kinase (AMPK) phosphorylation in HepG2 cells. These results suggest that CTE attenuates hepatic lipid accumulation by inhibiting lipogenesis through the modulation of the AMPK signaling pathway on FFAs-induced lipogenesis in HepG2 cells and may potentially prevent NAFLD.