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The Effects of Gehuajiecheng Decoction on Expression of COX-2, Serum Level of PGE2, TNF-α and IL-6 in Alcoholic Hepatitis

Background: In this experimental study, we have researched Gehuajiecheng decoction mechanism of action in the treatment of alcoholic hepatitis so as to supply an effective drug in clinical practice. Methods: 40 male Wistar rats were randomly divided into 4 groups and treated with different drugs. The control group were given intragastric administration of corn oil (2g/kg/per day) and 50% glucose (20ml/kg/per day); the model group were given intragastric administration of 40% alcohol (8g/kg/per day) and corn oil (2g/kg/per day); Gehuajiecheng decoction group were given intragastric administration of Gehuajiecheng decoction (13g/kg/per day) and 40% alcohol (8g/kg/per day); the Celecoxib group were given intragastric administration of celecoxib (10mg/kg/per day) and 40% alcohol (8g/kg/per day). 30 days after treatment, the rats were anesthetized with sodium pentobarbital and the blood was collected. Serum levels of AST, ALT and GGT were measured by using chromatometry, PGE2, TNF-α and IL-6 levels were examined by using radioimmunology method. After taking blood samples, the rats were sacrificed, and the liver was determined by Western blotting analysis. Results: Compared to controls, model group showed significantly higher levels of serum AST, ALT, GGT, PGE2, TNF-α and IL-6, which can be corrected by administration of Gehuajiecheng decoction or celecoxib, since the group treated with Gehuajiecheng decoction or celecoxib showed significantly lower levels of serum AST, ALT, GGT, PGE2, TNF-α and IL-6 (p<0.01). However, liver function and Inflammatory mediators in Gehuajiecheng decoction were not significantly lower than that of the celecoxib group (p>0.05). Similarly, COX-2 expression in the model group was significantly higher than that of controls. However, its expression can be depleted by Gehuajiecheng decoction or celecoxib as COX-2 expression in the model groups (p<0.01). Conclusion: Gehuajiecheng decoction protects against alcohol-induced liver injuries via inhibiting expression of COX-2, decreasing release of PGE2, TNF-α and IL-6. It has the same effect as COX-2 selective inhibitor, therefore, we suggest that this decoction could be used as an effective method in the treatment of alcoholic hepatitis.


Introduction
Alcoholic hepatitis (AL) is one of the most common diseases in the world. Severe cases of alcoholic hepatitis can lead to liver injuries and dysfunctions, and further progresses to cirrhosis and liver cancer [1][2][3][4]. Although several medicines such as glucocorticoids, pentoxifylline, antioxidants, and anti-TNF-α antibody have been used for clinical trial, currently, there is still no specific medicine for treatment of this disease [5][6]. From the perspective of traditional Chinese medicine, it provides a new way for the treatment of alcoholic hepatitis. Gehuajiecheng decoction was created by Li Dongyuan in the Jin and Yuan Dynasties. It is regarded as a special prescription for the treatment of alcoholic liver disease by doctors of all ages. Sometimes it is also called "Gehua Jiejiu Decoction", which comes from the theory of spleen and stomach. It is composed of 13 traditional Chinese medicines, such as Gehua, Fuling, Qingpi, Muxiang, Chenpi, Ginseng, Polyporus, fried Shenqu, Alisma, Ginger, Atractylodes macrocephala, cardamom and so on, which is one of the best antidotes to alcohol since ancient times, and also an effective antidote for alcoholic liver disease commonly used in modern times [7]. It was found in animal experiments that this prescription can reduce the blood alcohol content of experimental rats and has the effect of liver protection [8][9][10][11][12]. It has been reported that Gehuajiecheng decoction has the functions of protecting hepatocytes, anti fibrosis and reducing steatosis of hepatocytes [13][14][15]. We have discussed the experimental study of Gehuajiecheng decoction on alcoholic hepatitis.

Construction of Rat Models of Alcoholic Hepatitis
40 male Wistar rats weighing 170-220g were purchased from the animal laboratory of Jilin University (License No: SCXK2003-007). The rats were randomly divided into 4 groups (model group, Gehuajiecheng decoction, celecoxib group, and control group, 10 of each group), and fed in separate cages (4-5 of each cage). All the rats except controls were given intragastric administration of alcohol (8g/kg/per day). The dose of alcohol was calculated using the following formula: dose of alcohol (g)=the volume of alcohol (ml) × the concentration of alcohol (g/ml) × 0.8. The rats were regularly given intragastric administration of alcohol at 9 a. m and drug at 4 p. m daily for 4 weeks. Animals in both the experimental and control groups were fed with ordinary granular feedingstuff and caged in a clean animal laboratory with temperature of 22±2°C and humidity of 70%±5%, eating and drinking freely. The control group (n=10) were given intragastric administration of corn oil (2g/kg/per day) and 50% glucose (20ml/kg/per day); the model group (n=10) were given intragastric administration of 40% alcohol (8g/kg/per day) and corn oil (2g/kg/per day); Gehuajiecheng decoction group (abbre. Gehua group) (n=10): Gehua group (13 g/kg/per day) and 40% alcohol (8g/kg/per day) was given by gavage; the celecoxib group (n=10) were given intragastric administration of celecoxib (10mg/kg/per day) and 40% alcohol (8g/kg/per day).

Liver Blood and Tissue Preparations
30 days after treatment, the rats were anesthetized with sodium pentobarbital. The abdominal aortic blood (4-5ml of each rat) was collected under aseptic conditions and the rats were sacrificed. The blood was centrifuged at 4000rpm for 10 minutes and the supernatant was collected, aliquoted and stored at -70°C. The right lobe of liver was excised, washed in physiological saline, dried with filter paper, and fragmented into several pieces. One piece of liver tissues was fixed in 10% neutral buffered formalin, and the others were snap-frozen in liquid nitrogen and then kept at -70°C.

Determination of Serum Levels of Various Indicators
Serum levels of AST, ALT and GGT were measured by using Full Automatic Biochemical Analyzer (Hitachi, 7170, Japan). Serum levels of PGE2, TNF-α and IL-6 were examined by using commercial radioimmunology assay kits according to the manufacturer's manuals. Briefly, the samples were centrifuged at 3000r/min for 3 seconds and stored at -70°C until used. When required, the samples were centrifuged at 40°C, 3500 r/min for 15 minutes and the supernatants were used for measurement (FJ -2008PSγ counter).

Histopathological Examination of Liver Tissue
Following fixation with 10% neutral buffered formalin, the liver tissues were sliced, dehydrated with graded ethanol, stained with H&E, and examined for histopathological morphology.

Determination of COX-2 Expression in Liver Tissues
Expression level of COX-2 in liver tissues was determined by Western blotting analysis. The fresh-frozen liver tissues were weighted, and lysed at ratio of 1: 10 in protein lysis buffer (1%SDS, 1% triton X-100, 1% NP-40). The lysates were centrifuged twice at 10,000rpm for 5 minutes and the supernatants were collected. Protein concentrations were examined using Coomassie brilliant blue G250. A standard curve (Y=31.1402X+0.0318, Y=protein concentration, X=OD value) was generated and protein concentrations were then determined. A total of 150µg protein for each sample was subjected to discontinuous SDS-polyacrylamide gel TNF-α and IL-6 in Alcoholic Hepatitis electrophoresis (SDS-PAGE). Following electrophoresis, proteins were transferred onto nitrocellulose membrane in a semi-dry transfer buffer. The membrane was blocked in 5% milk at room temperature for one hour and then incubated at 4ºC overnight in primary antibodies. The following day, membranes were washed with TBS buffer and incubated in corresponding horseradish peroxidase-conjugated secondary antibodies at 37°C for 2 hours. Membranes were then washed in TBST, and protein bands were visualized by an Enhanced Chemiluminescence (ECL) and exposed to hyperfilm. The film was developed and the bands were analyzed using Bandscan software. The relative expression level of COX-2 was evaluated by COX-2/β-actin ratio.

Statistical Analysis
For comparing values obtained in different groups, one-factor analysis of variance (ANOVA) was performed by using SPSS22.0 software. P<0.05 or 0.01 was considered to be statistically significant.

General Conditions
No significant differences in weight of rats were observed between the control group and the other groups before and after treatment. During the treatment, all the rats in the control group were healthy and active, showing smooth coat, good spirit and appetite, and increased weight, whilst the rats in the model group suffered different degrees of drowsiness, showing dull coat and low spirit, reduced activities, loss of appetite and weight. The general conditions of rats in Gehua group and celecoxib group were slightly worse than those of controls but better than those of the model group.

Pathological Changes of Liver Tissues
Alcohol-induced liver injuries and its prevention by Gehuajiecheng decoction and celecoxib were confirmed by gross and microscopic examination of the liver in all the groups.

Gross Observations
The liver tissues of control rats were red-brown, and the surface was smooth and glistening. Whereas in the model group, the livers of rats were enlarged dramatically, had a pale yellow or yellow appearance, blunt edge and tight capsule, and adhered to surrounding tissues. Yellow-white focal degenerative lesions were visible, and the cut surface was greasy and cloudy. The pathological changes of liver of rats in Gehua group and celecoxib group were slightly severer than those of controls but milder than those of the model group. The color is darker than the control group but lighter than the model group. Yellow-white focal degenerative lesions were invisible, and the cut surface was still shiny and did not feel greasy.

Light Microscopic Observations (H&E Staining)
In the control group, the structures of liver lobular were intact. Hepatocytes showed normal cell morphology and lined radiating outward from a central vein in the center (Figure 1). However, in the model group, the structures of liver lobular were in disorder. Mild ballooning degeneration of hepatocytes was widely observed, but necrosis of hepatocytes, infiltrating inflammatory cells and fatty liver changes had not been found ( Figure 2). Gehua group (Figure 3) and celecoxib group (Figure 4) showed near intact structures of lobular, mild swollen hepatocytes, but no ballooning degeneration.     As shown in Table 1, serum levels of AST, ALT and GGT in the model group were significantly higher than those in the control group (p<0.01). Serum levels of AST, ALT and GGT in either Gehua group or celecoxib group were significantly lower than those in the model group (p<0.01). No significant differences in serum ALT, AST and GGT were observed between Gehua group and celecoxib group (p>0.05). These results indicate that Gehuajiecheng might protect against alcohol-induced hepatotoxicity by decreasing serum levels of ALT, AST and GGT. As shown in Table 2, serum levels of PGE2, TNF-α and IL-6 in model group were significantly higher than those in the control group (p<0.01). Serum levels of PGE2, TNF-α and IL-6 in either Gehua group or celecoxib group were significantly lower than those in the model group (p<0.05). No significant differences in serum PGE2, TNF and IL-6 were observed between Gehua group and celecoxib group (p>0.05). These results suggest that Gehuajiecheng decoction have effects of decreasing serum levels of PGE2, TNF-α and IL-6, and protecting hepatocytes from inflammatory damage.

COX-2 Expression in Liver Tissues (x±s)
To understand the impact of various treatments on liver COX-2 expression, the expression levels of COX-2 in liver tissues in all the four groups were examined by Western blotting analysis, and β-actin was used as a loading control ( Figure 5). The relative expression levels of COX-2 were then presented and compared by the value of COX-2/β-actin ratio (Control group: 0.198±0.037, n=10; Model group: 0.422±0.050, n=10; Gehua group: 0.281±0.043, n=10; Celecoxib group: 0.252±0.060, n=10). The control group showed low expression of COX-2, whilst the model group exhibited significantly higher expression level of COX-2 (p<0.01). Moreover, a significantly lower COX-2 expressions were found in either Gehua group or celecoxib group when compared to the model group ((p<0.01).

Discussion
The main feature of acute alcoholic hepatitis is a series of inflammatory alterations, in company with liver injuries, the mechanisms of which include release of inflammatory mediators, peroxides, toxic oxygen, and Kupffer infiltrating. PGE2, TNF-α, TGF and IL6 are considered to be critical inflammatory mediators involved in this process. PGE2 is a metabolic product of COX-2, while COX-2 is a subtype of COX, a rate limiting enzyme that occurs during synthesis of PGs, COX-2 is not expressed or weakly expressed in normal tissues, but its expression level is markedly increased in the tissues with inflammation or tumors [16][17][18]. It has been previously shown that COX-2 expression is markedly increased in liver tissue of patients with alcoholic hepatitis. Elevated COX-2 expression increases PGE2 expression, aggravating liver injuries of alcoholic hepatitis [19]. In this study, we constructed the rat models of alcoholic liver injuries, and investigated the impact of Gehuajiecheng decoction on alcohol-induced liver injuries. We also examined COX-2 expression levels in liver tissues after various treatments, and explored the impact of Gehuajiecheng decoction and COX-2 selective inhibitor on alcoholic liver injuries. Our results demonstrated that COX-2 was weakly expressed in controls but highly expressed in the model group, The difference is significant. Compared to the model group, either Gehuajiecheng decoction or celecoxib group showed lower expression levels of COX-2, which is consistent with those reported by Bykov [19]. Bykov's study also revealed that serum levels of PGE2 and TNF -α elevated in alcoholic hepatitis, and a COX-2 inhibitor, celecoxib can dramatically reverse liver injuries [16]. Our results demonstrated that serum levels of PGE2, TNF-α and IL6 in the model group were significantly higher than that of controls. But after treatment of Gehuajiecheng decoction, serum levels of PGE2, TNF-α and IL6 significantly reduced compared to the model group. This suggests that Gehuajiecheng decoction decreases PGE2, TNF-α and IL6 levels and relieves inflammatory reactions.
Damage of mitochondria is usually the first presentation of alcoholic liver injuries. Since AST level in mitochondria of hepatocytes is much higher than that in hepatic sinusoid, serum AST will markedly elevate when the permeability of hepatocytes membrane increases although hepatocyte necrosis might not happen [19][20][21][22]. Therefore, serum AST is one of the sensitive indicators to estimate alcoholic liver injuries although it might not increase or just increase slightly in alcoholic hepatitis. In this study, although histological changes of hepatocytes did not reach the diagnostic standard of fatty liver or fibrosis, injuries were clearly observed. Thus, serum levels of ALT and AST in the model group were significantly higher than that of controls. The findings that serum levels of ALT and AST in Gehuajiecheng decoction or celecoxib groups were lower than those in liver injury group suggest that Gehuajiecheng decoction has the function of protecting alcohol-induced liver injuries.
GGT is a liver enzyme involved in the transport of amino acids and peptides into cells as well as glutathione metabolism. GGT is mainly found in membranes and microsome of hepatocytes and such as extremely sensitive to injuries of hepatocytes. When liver cells are injured, GGT is released to blood and elevated GGT level can be detected in serum [23]. The observation that serum level of GGT as well as AST and ALT in the model group was significantly higher than that of controls in this study is convincing evidence [24][25][26][27]. Serum GGT level in Gehua group or celecoxib group had a decrease, thus our results is that Gehua group reverses alcohol-induced liver cell injuries.
In conclusion, during the process of alcoholic liver injuries, inflammatory changes of liver in the early stage stimulate COX-2 expression and then induce the releases of PGE2, TNF-α and IL-6, which can be prevented by Gehuajiecheng decoction, resulting in relief of alcohol-induced liver injuries.