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Year : 2016  |  Volume : 12  |  Issue : 48  |  Page : 302-306  

Soyasaponin bb protects rat hepatocytes from alcohol-induced oxidative stress by inducing heme oxygenase-1

College of Food Science and Technology, Bohai University, Food Safety Key Lab of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning, China

Date of Submission23-Jan-2016
Date of Acceptance10-Feb-2016
Date of Web Publication13-Oct-2016

Correspondence Address:
Dr. Tao Ma
College of Food Science and Technology, Bohai University, Food Safety Key Lab of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou, Liaoning
Dr. Xiuying Liu
College of Food Science and Technology, Bohai University, Food Safety Key Lab of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products; Jinzhou, Liaoning
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0973-1296.192203

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Background: It has been known that oxidative stress induced by alcohol played a crucial role in the formation of alcoholic liver disease. Although the formation mechanisms underlying liver injury induced by alcohol still remained largely unknown, it has been considered that oxidative stress played a core role in the pathogenesis of hepatocyte damage. Objective: The aim of this study was to investigate the effects of soyasaponin Bb (Ss-Bb) on oxidative stress in alcohol-induced rat hepatocyte injury. Results: It has been shown that the administration of Ss-Bb could significantly restore antioxidant activity in BRL 3A cells. Moreover, the impaired liver function and morphology changes resulting from ethanol exposure were improved by Ss-Bb treatment. Treatment with a pharmacological inhibitor of haem oxygenase-1 (HO-1) indicated a critical role of HO-1 in mediating the protective role. Finally, we found that pretreatment with Ss-Bb to ethanol exposure cells increased the expression level of HO-1.Conclusion: It was suggested that Ss-Bb may protect against alcohol-induced hepatocyte injury through ameliorating oxidative stress, and the induction of HO-1 was an important protective mechanism.

Keywords: Alcohol, heme oxygenase-1, oxidative stress, soyasaponin Bb

How to cite this article:
Zhu L, Fu R, Liu X, He Y, Wang B, Ma T. Soyasaponin bb protects rat hepatocytes from alcohol-induced oxidative stress by inducing heme oxygenase-1. Phcog Mag 2016;12:302-6

How to cite this URL:
Zhu L, Fu R, Liu X, He Y, Wang B, Ma T. Soyasaponin bb protects rat hepatocytes from alcohol-induced oxidative stress by inducing heme oxygenase-1. Phcog Mag [serial online] 2016 [cited 2022 Nov 29];12:302-6. Available from: http://www.phcog.com/text.asp?2016/12/48/302/192203


  • Effects of soyasaponin Bb was investigated on oxidative stress in rat hepatocytes
  • Cell viability and antioxidant capacities were evaluated to determine the effects
  • The expression level of HO-1 was measured to reveal the proptective mechanisms

   Introduction Top

It has been known that excessive alcohol consumption results in alcoholic liver disease (ALD), which was the leading cause of advanced liver disease and death among adults in Europe and some other areas.[1] The same thing also happened in developing countries, for instance, the incidence of ALD increased from 2.7 to 4.4% during the first 5 years of the 21st centrury.[2] Fatty liver, alcoholic hepatitis, fibrosis, and cirrhosis were four characterized stages of ALD,[3] and finally the risks of liver cancer increase significantly.[4] Although the formation mechanisms underlying liver injury induced by alcohol still remained largely unknown, it has been considered that oxidative stress played a core role in the pathogenesis of hepatocyte damage.[5],[6],[7]

Oxidative stress, a principle cause of aging and diseases, was defined as an imbalance between excess production of reactive oxygen species (ROS) relative to the defense of antioxidant.[8] As oxygen-based chemical intermediates with high reactivity, the increase production of ROS was a causal feature in the toxicity of many xenobiotics.[9],[10] Excessive intake of alcohol could enhance the production of ROS and restrain the activity of antioxidants in vivo , such as superoxide dismutase (SOD), glutathione (GSH), and NAD(P)H: quinone oxidoreductase.[11],[12] Research showed that the induction of cytochrome P450-2E1 (CYP2E1) was the material cause for the generation of ROS and oxidative stress.[13],[14],[15] The generated ROS could initiate lipid peroxidation, which directly damaged intracellular membranes and plasma. The production of reactive aldehydes negatively influences liver or other vital organs with profibrotic properties and potent proinflammatory.[16] Among various genes encoding for antioxidative proteins, haem oxygenase-1 (HO-1) has attracted particular interest, which could generate metabolites with many important biological activities.[17] Increasing evidence supported that many natural products extracted from food could induce the expression of HO-1, and represent enhanced resistance to various oxidative stresses.[18],[19],[20],[21] These functional extracts have shown good potential on relieving alcohol-induced oxidative stress.

Soyasaponins are one kind of amphiphilic oleanane type triterpenoid glycoside isolated from soybeans (Glycine max ) and other legumes, which have been generally classified into four groups: A, B, E, and DDMP (2,3-dihydro-2,5-dihydroxy-6-methyl-4Hpyran-4-one), according to their aglycones.[22] Recent studies reported that soyasaponins presented a wide range of health benefits, including memory impairment prevention, immune adjuvant activities, and cytoprotective and hepatoprotective effects.[23],[22],[23],[24],[25],[26] Although crude soyasaponins-rich extract has been shown effective on acute alcohol-induced hepatotoxicity in mice,[27] the protective mechanism and monomer compound activities are still unknown, which limited their application in functional foods.

In this study, we chose soyasaponin Bb, the principal monomer compound among soyasaponins extracted from soybeans,[28] and investigated its effects on alcohol-induced oxidative stress in rat hepatocytes. The cell viability and antioxidant capacities were evaluated to determine the effects of soyasaponin Bb on the oxidative stress in BRL-3A cells exposed to alcohol. The expression level of HO-1 was measured to reveal the molecular mechanisms of soyasaponin Bb on alcohol-induced oxidative stress partially.

   Materials and Methods Top

Chemicals and reagents

Soyasaponin Bb (Ss-Bb, C48H78O18; molecular weight: 943.134; purity >98%) was provided by Chengdu Biopurify Phytochemicals Ltd. (Chengdu, PR China). The cell culture components and reagent grade chemicals used, streptomycin, penicillin, 3, 4, 5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide (MTT), Dulbecco's Modified Eagle's Medium, PBS, sodium pyruvate, dimethyl sulfoxide, nonessential amino acids, 2,7-dichlorofluorescin diacetate (DCFH-DA) were purchased from Sigma Chemical Co. (St. Louis, MO, USA). Bicinchoninic acid protein assay kit and trypsin was purchased from Beyotime Company (Jiangsu, China). Fetal calf serum was purchased from HyClone Company (Logan, UT, USA). Sn(IV) protoporphyrin IX dichloride (SnPP), an inhibitor of HO-1, was obtained from Frontier Scientific (Logan, UT, USA). Deionized water was obtained using a NW10LVF water purification system (Heal Force, Hong Kong, China). Other reagents were of analytical grade. Alanine aminotransferase (ALT), malondialdehyde (MDA), SOD, and GSH kits were purchased from Jiancheng Bioengineering Institute (Nanjing, China).

Cell culture and treatment

BRL 3A-immortalized rat hepatocytes were from Chinese Academy of Science (Shanghai, China), and were grown in Dulbecco's Modified Eagle's Medium culture medium, which is supplemented with 100 μg/mL streptomycin, 100 U/mL penicillin, and 10% fetal calf serum. The cells were incubated at 37oC and pH 7.4 in a 5% CO2 atmosphere. The inoculum density of BRL-3A was 2 × 105 cells/mL in 96-well plates. Ethanol was mixed with deionized water with a concentration of 250 mmol/L before being added to the cell culture.[29] The cells were preincubated with 0, 25, 50, and 100 μg/mL Ss-Bb for 24 h and then incubated with 0 or 250 mmol/L ethanol for 24 h.[26]

Cell viability assay and morphological analysis

The conversion of MTT to a purple color product by cellular mitochondria was used to evaluate cell viability. After a series of treatment, cells of each group were washed by sterile PBS three times and subsequently incubated with at a concentration of 5 mg/mL MTT for 3 h, and finally dissolved in dimethyl sulfoxide. The percent of cell viability was defined as the relative absorbance of Ss-Bb or ethanol-treated cells versus ethanol untreated cells at 570 nm. After the treatment, images of the cells of each group were taken with an AE 31 inverted phase contrast microscope (Motic, Shenzhen, China) equipped with a quick imaging system.

Reactive oxygen species determination

Intracellular production of ROS was measured by DCFH-DA fluorescence probe, which passively diffused into cells and produces a well-retained polar diol. The changes via the production of relative ROS in fluorescence were compared with the fluorescence of the corresponding control. After the treatment, cells of each group were incubated with 10 μmol/L DCFH-DA at 37oC for 30 min in the dark, and then washed three times with PBS. The cells were analyzed in a CytoFLEX flow cytometer (Beckman Coulter, Brea, California, USA) at excitation and emission wavelengths of 488 and 525 nm, respectively.

Measurements of the antioxidant status, intracellular oxidant, and liver function

To measure the level of GSH and MDA, and the activity of SOD, cells of each group were collected and these biochemical indicators were determined by commercially purchased kits for assessing the antioxidant status and intracellular oxidant. The determination of ALT level was used to evaluate liver function, and also detected by purchased assay kits.

Real-time PCR

Total RNA was purified from cells of each group with RNA Prep Pure Tissue Kit (TIANGEN, Beijing, China). Complementary DNA (cDNA) was synthesized through the purified RNA. PCR reaction was carried out in a 20 μL reaction mixture on a 96 real-time quantitative thermal block (Bioneer, Daejeon, Korea). The following sequences of HO-1 with CTGGAATGGAAGGAGATGCC and TCAGAACAGCCGCCTCTACCG, as well as β-actin with GAGATTACTGCCCTGGCTCCTAGC and GGCCGGACTCATCGTACTCCTGCTT, are primers used in this study. Comparative threshold (CT) cycle method was used to analyze the obtained data.

Western blotting assay

Western blot analyses of HO-1 were performed as described.[15] The optical density ratio of the protein product to β-actin was obtained and expressed as percentage or ratio of the control value in the figures.

Statistical analysis

Experiments of Western blotting analysis were repeated three times with similar trends. Data were analyzed using one-way analysis of variance. All results were expressed as mean ± SD. Differences were considered significant for P < 0.05, and all analyses were performed using version 13.0 SPSS for Windows (Chicago, IL, USA).

   Results Top

Cell viability and morphology

Cell viability assay suggested that approximately 60% of BRL 3A cells became inviable after 24 h exposure to ethanol [Figure 1]. After Ss-Bb pretreatment, 50 and 100 μg/mL Ss-Bb groups significantly increased the cell survival rate (P < 0.01), whereas 25 μg/mL Ss-Bb group only increased around 15% and did not obviously alter cell viability compared with the ethanol alone group.
Figure 1: Cell viability (A) and ROS generation (B) of BRL 3A cells treated with ethanol and Ss-Bb. The cells were preincubated with 0, 25, 50, and 100 μ/mL Ss-Bb for 24 h and then incubated with 0 or 250 mmol/L ethanol for 24 h. Data are presented as mean ± SD of three independent experiments performed in triplicate. Significant difference: **P < 0.01, compared with the control. P < 0.01, compared with the 250 mmol/L ethanol group

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Phase contrast microscopic observations after exposure to 250 mmol/L ethanol revealed morphological changes showing loss of cell integrity, cytoplasmic shrinkage, and typical apoptotic features [Figure 2]. Pre-incubation with 25 μg/mL Ss-Bb had no significant effect on cell morphology compared with the ethanol alone group. Significant improved effects were observed in the cells with incubation concentrations of 50 and 100 μg/mL Ss-Bb before treatment with ethanol (P < 0.01). Most of the cells were restored to normal in both the groups. Synthesizing the results of cell viability and morphology, we selected 50 and 100 μg/mL as the incubation concentration for the following studies.
Figure 2: Ethanol and Ss-Bb induce morphological changes in BRL 3A cells. The cells were preincubated with 0 μ/mL (A and B), 25 μ/mL (C), 50 μ/mL (D), and 100 μ/mL (E and F) Ss-Bb for 24 h and then incubated with 0 mmol/L (A and F) or 250 mmol/L (B.E) ethanol for 24 h. After the treatment, images were taken with an Motic inverted phase contrast microscope

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Effects of soyasaponin bb on reactive oxygen species generation

The generation of ROS was expressed as the measured fluorescence intensity in cells of each group, and representative results are shown in [Figure 1]. Ethanol (250 mmol/L) significantly increased the level of ROS production compared with the control group (P < 0.01), whereas pre-incubation with 50 and 100 μg/mL Ss-Bb significantly reduced ROS generation induced by ethanol (P < 0.01). The two Ss-Bb pre-incubation groups still showed significant ROS increases compared with the control group (P < 0.01).

Effects of soyasaponin bb on antioxidant status, intracellular oxidant, and liver function

Levels of MDA and GSH and activities of SOD and ALT were evaluated in cells of each group to assess the antioxidant status, intracellular oxidant, and liver function [Table 1]. The MDA levels and ALT activities in the groups treated with 250 mmol/L ethanol were significantly higher than those in the control group (P < 0.01). The indices of MDA and ALT in the cells pre-incubated with 50 and 100 μg/mL Ss-Bb were remarkably lower than those in the cells treated with ethanol alone (P < 0.01). The results also suggested that 250 mmol/L ethanol significantly decreased GSH level and SOD activity (P < 0.01). Compared with the ethanol alone group, GSH levels and SOD activities significantly increased in the group pre-incubated with 50 and 100 μg/mL Ss-Bb (P < 0.01). To investigate whether HO-1, one of the most readily induced enzymatic antioxidants, was involved in the Ss-Bb-induced protection or not, HO-1 inhibitor (SnPP, 10 μmol/L) was used in this study. Results showed that SnPP did not only remarkably abrogate the protective effect of Ss-Bb, but also further promoted ethanol-induced GSH and SOD depletion, lipid peroxidation, and the leakage of ALT.
Table 1: Effect of ethanol, Ss-Bb, and SnPP on MDA level, GSH level, SOD activity, and ALT activity of BRL 3A cells

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Effects of soyasaponin bb on the mRNA and protein expression levels of haem oxygenase-1

The expression levels of HO-1 in BRL 3A cells were investigated to explore the molecular mechanism of the protective effect of Ss-Bb against ethanol-induced oxidative stress [Figure 3]. There were no significant changes in mRNA and protein expression levels of HO-1 in ethanol exposed group compared with the control via the real-time PCR and Western blot assay. The administration of Ss-Bb significantly activated the expression of HO-1 (P < 0.01), particularly for 100 μg/mL dose of Ss-Bb increased 196.25 and 74.55% of the mRNA and protein expression compared with the ethanol alone group, respectively.
Figure 3: Effect of ethanol and Ss-Bb on mRNA (A, real-time PCR), and protein (B and C, Western blot analysis, with a same ordering) expression levels of HO-1 in BRL 3A cells. The cells were preincubated with 0, 25, 50, and 100 μg/mL Ss-Bb for 24 h and then incubated with 0 or 250 mmol/L ethanol for 24 h. Data are presented as mean ± SD of three independent experiments performed in triplicate. Significant difference: **P < 0.01, compared with the control. P < 0.01, compared with the 250 mmol/L ethanol group

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   Discussion Top

As a physiological disturbance in redox status, oxidative stress was closely associated with various pathological conditions.[9],[10],[30] Researchers have found that excessive ROS are produced during ethanol metabolism by catalase, ethanol dehydrogenase, and CYP2E1.[13],[31] In this study, we found that Ss-Bb-reduced oxidative stress in BRL 3A rat hepatocytes exposed to ethanol. The apoptosis, morphological changes, impaired antioxidant system, and liver function caused by ethanol exposure were improved after Ss-Bb treatment. Furthermore, the administration of Ss-Bb increased the expression level of HO-1 in these hepatocytes.

As an important group of active ingredients in soybean, soyasaponins have been proved to exhibit various effects.[23],[24],[25],[26] More importantly, other researchers have found that crude soyasaponins-rich extract showed protective effects on acute alcohol-induced hepatotoxicity in mice.[27] Therefore, it was reasonable to hypothesize that monomeric soyasaponin, such as Ss-Bb, protect against ethanol-induced hepatocyte injury through its antioxidant activity. To test this hypothesis, whether the administration of Ss-Bb could attenuate ethanol-induced apoptosis in rat hepatocytes was determined firstly, and the cell viability combined with morphology of three pre-incubated groups showed different improvement effects. Levels of oxidative stress markers and liver function, including the content of ROS, GSH and MDA, and the activities of SOD and ALT, were also tested to evaluate the protective effects. Results showed that Ss-Bb could not completely eliminate the generated ROS caused by ethanol exposure, although the antioxidant activity of the cells was significantly restored. It was suggested that the antioxidant capacity of Ss-Bb was not achieved only by the removal of ROS. HO-1, a stress-responsive protein, was ubiquitous and responsible for catalyzing the cleavage of prooxidative haem into bioactive products such as bilirubin, CO, and free iron.[32] Its activity could be considered as a possible candidate to initiate both anti-inflammatory and hepato-protective mechanisms.[33] In chronic inflammatory diseases, HO-1 played an important anti-inflammatory role, and it also presented antiproliferative properties and antiapoptotic.[34] In this study, the BRL 3A cells exposed to ethanol did not significantly downregulate the expression of HO-1, which showed a different result to the chronic ethanol ingestion in rat or some cell models.[35],[36] It may be because of relatively short time of ethanol exposure (24 h) or different ethanol concentrations in cell treatment compared with zoopery. The differences in cell lines and sample treatments may also contribute to the changes on the ethanol sensitivity of the HO-1. However, pretreatment with SnPP, a pharmacological inhibitor of HO-1, markedly decreased antioxidant activity in cells, providing evidence that HO-1 induction is involved in the regulation of Ss-Bb. The mRNA and protein expression of HO-1 also obviously upregulated after in Ss-Bb pretreated groups. Therefore, the induction of HO-1 by Ss-Bb administration may contribute to its beneficial effects on alcohol-induced oxidative stress.

Financial support and sponsorship

This work was supported by the Cultivation Plan for Youth Agricultural Science and Technology Innovative Talents of Liaoning Province (2015001).

Conflict of interest

There are no conflicts of interest.

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[Pubmed] | [DOI]


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