Lycopene and resveratrol pretreatment did not interfere with the liver of hepatectomized rats¹

Abstract

Purpose:

To investigate the effects of lycopene and resveratrol pretreatment on hepatic hyperplasia in partially hepatectomized rats.

Methods:

The lycopene group and the resveratrol group received 40 mg/kg/day of lycopene or resveratrol, respectively (dissolved in olive oil or in saline solution, respectively) and administered via a gastric tube for 30 days. The partially hepatectomzed (PH) control groups received saline or olive oil via a gastric tube for 30 days, respectively, and the normal control group received no treatment. Liver tissue and intracardiac blood samples were obtained 24, 36 or 48 h after PH.

Results:

No areas of fibrosis were detected. No significant changes in mitotic index, in the number of apoptosis events or in aspartate aminotransferase and alanine aminotransferase levels were observed.

Conclusions:

Lycopene and resveratrol pretreatment did not interfere on hepatic hyperplasia in partially hepatectomized rats.

Key words :
Alanine Transaminase; Aspartate Aminotransferases; Apoptosis; Mitotic Index; Rats.

Introduction

Lycopene, an acyclic form of b-carotene, is present in tomatoes, whose consumption can promote high lycopene concentrations in blood. These concentrations are inversely correlated with the risk for various types of cancers such as prostate cancer¹, cancer of the digestive apparatus², and pancreatic cancer³, also having a protective effect against myocardial infarction⁴. The mechanism by which lycopene can affect carcinogenesis in the prostate is still being investigated. In vitro and animal studies have suggested that the mechanism involved may affect the progression of the cell cycle⁵, the levels of antioxidant enzymes⁶, communication junction⁷, and cell proliferation⁸ in different cancer cell lines.

Lycopene has an antioxidant action⁹ and its daily ingestion can strengthen the antioxidant system and inhibit lipid peroxidation in humans¹⁰.

Various lycopene doses have been studied. For example, patients with cancer of the prostate treated orally with lycopene capsules (30 mg/day/3 weeks) showed a reduction of tumor size and of plasma PSA levels compared to control¹¹. Oral doses of 10 ou 50 mg/kg/2 weeks inhibited lipid peroxidation of hepatic tissue in rats¹². Bahcecioglu et al.¹³ observed that lycopene (2 mg/kg) had a preventive effect against the development of non-alcoholic steatohepatitis induced by a high lipid diet, attributed to its antioxidant action. Bestas et al.¹⁴, in a study of the preventive action of lycopene (25 mg/kg/day) and of vitamin E (100 IU/kg/day) against halothane-induced hepatotoxicity, observed that only lycopene had a significant hepatoprotective activity.

Resveratrol (3,5,4 trihydroxystilbene) is a natural polyphenol detected in many plant species, including the grape vine (Vitis vinifera). Resveratrol occurs in two forms, i.e., cis and trans, with the trans form being biologically more active. The benefits of resveratrol consumption have stimulated various investigations of this substance. Over the last few decades, resveratrol has attracted the attention of scientists all over the world because of its anticancer, anti-inflammatory, and hypoglycemic activities, in addition to other cardiovascular benefits. In order to confirm these properties, resveratrol has been studied in experimental mouse and rat models¹⁵. It was first observed that resveratrol prolongs the life of lower organisms, simulating the anti-aging effects of calorie restriction¹⁶. Resveratrol has a vasoprotective action in animal models of diabetes mellitus, improving endothelial function and attenuating vascular inflammation^17,18. In addition, the Mediterranean diet, rich in resveratrol, is associated with a reduced risk of cardiovascular mortality in human beings¹⁹.

Resveratrol is a neutralizer of free radicals²⁰. The antioxidant capacity of polyphenol compounds depends on the redox properties of their phenolic hydroxyl groups and on the potential of electron dislocation throughout their chemical structure²¹. The common recognition of resveratrol as a natural antioxidant was explicitly reported by Zini et al.²². Resveratrol has three different antioxidant mechanisms: (a) competition with coenzyme Q to reduce the oxidative chain complex, the site of production of reactive oxygen species (ROS), (ii) neutralization of O₂- radicals formed in the mitochondria, and (iii) inhibition of lipid peroxidation induced by Fenton reaction products.

Resveratrol, as a natural antioxidant, can neutralize some intracellular ROS. Although it is not a potent antioxidant in vitro, resveratrol has a high antioxidant activity in vivo, probably due to its ability to increase the synthesis of nitric oxide, which in turn acts as an antioxidant¹⁵.

Resveratrol has been studied in order to confirm its hepatoprotective actions in addition to its various actions already described. Lee et al.²³ reported that resveratrol (20 mg/kg daily for 4 weeks) showed in vivo hepatoprotective and antifibrinogenic activity on hepatic injury induced by dimethylnitrosoamine by inhibiting the elevation of serum transaminases, suggesting its possible usefulness in the prevention of the development of hepatic fibrosis. Tunali-Tunali et al.²⁴ obtained similar results with an oral resveratrol dose of 10 mg/kg applied to rats with methotrexate-induced liver injury, which could be a therapeutic option for minimizing the systemic side effects of chemotherapeutic agents. Gedik et al.²⁵ reported that resveratrol (10 mg/kg) had hepatoprotective activity in rats submitted to ischemia and reperfusion, an effect possibly associated with its antioxidant activity against the free radicals released during the period of reperfusion. Das et al.²⁶ demonstrated that resveratrol at the dose of 5 mg/kg/day showed immunomodulatory activity and effectively improved the angiogenesis process and the oxidative changes induced by ethanol in mice.

The aim of the present study was to investigate the effects of lycopene and resveratrol pretreatment on hyperplasia of the liver in partially hepatectomized rats.

Methods

The study protocol was approved by the Animal Research Ethics Committee - Pontiifícia Universidade Católica de Campinas (Protocol 033/2013) according to the Guide for the Care and Use of Laboratory Animals.

Materials

Reagents were acquired from the following sources: resveratrol and lycopene (All Chemistry do BrasilTM), vincristine sulfate (Libbs FarmaceuticaTM); enzyme assay kit (LaborLab). All other reagents were analytical grade.

Animals

Forty-five-day-old male Wistar rats (Rattus norgevicus, non-isogenic) (n = 65), weighing 200 ± 10 g were obtained from the Animal Facility of the Life Sciences Center (Pontifícal Catholic University of Campinas, SP, Brazil). Throughout the experiments, the animals were maintained in rooms with controlled temperature (23±1°C) under a 12-hour light/dark cycle, with free access to commercial chow (Nuvilab) and water.

Partial hepatectomy

Animals were divided into a Normal control group (NC), a Lycopene group (LPH) and its Partial Hepatectomy Control group (PH1), a Resveratrol group (RPH) and its Partial Hepatectomy Control group (PH2) (Figure 1). Except for NC, the remaining groups were further divided into three subgroups (n=5 in each subgroup). LPH animals received 40 mg/kg/day lycopene dissolved in olive oil for a volume of 1 mL and administered via a gastric tube for 30 days. RPH animals received 40 mg /kg/day resveratrol in saline solution for a volume of 1 mL administered via a gastric tube for 30 days. The two PH control groups of the groups treated with lycopene and resveratrol respectively received 1 mL olive oil or saline solution administered via a gastric tube for 30 days. Next, the rats underwent partial hepatectomy and, after 24, 36 or 48 h, they received an intraperitoneal injection of vincristine sulfate (1 mg/kg). Rats were injected with vincristine to block the cell cycle of all hepatocytes at the M phase²⁷. NC animals were only kept under the same housing conditions with no treatment or surgical procedures and only received the vincristine sulfate injection like the other groups. After 2 h, the animals were anesthetized for removal of liver tissue. Three ml intracardiac blood samples were drawn for biochemical anal ysis, followed by euthanasia with ketamine and xylazine.

PH was carried out as described by Higgins and Anderson²⁸. This procedure involves the surgical removal of about 70% of liver tissue. Samples of the remaining lobes were obtained 24, 36 or 48 h after surgery and used for histological and histochemical analyses.

Figure 1
Experimental design.

Histological processing

Liver tissue fragments were cut into 7 μm-thick slices and stained with hematoxylin-eosin (HE) and by the Feulgen method (FM). The FM allows to clearly visualize the hepatocyte nucleus and to identify the mitosis. Masson's trichrome staining was not performed since the presence of fibrosis identifiable by microscopy was not expected within the short period of the experiment. Images were captured digitally using a photomicroscope (Nikon Eclipse E200^TM) coupled to a camera (Nikon Colpix 4500^TM). Mitotic index and apoptosis were assessed after PH.

Determination of enzyme activity

ALT and AST activity was determined in blood serum using LaborLab^TM kits and a UV-Vis Varian^TM spectrophotometer.

Data analysis

Data are reported as number of findings per micrograph. Mitotic and apoptotic figures were counted in 20 fields per liver tissue section stained with HE and FM. Statistical analysis of morphometry, AST and ALT data was performed using Graph Pad PRISM^TM 3.0 software. The Kruskal-Wallis test and Dunn's post-test (p <0.05) were used for group comparisons. The "n" used was statistically determined in order to obtain reliable results.

Results

As expected, histological analysis of the Normal control group revealed a reduced number of mitosis and apoptosis. During the experimental period, no histologic alterations were detected in the liver of the remaining groups studied, indicating the absence of hepatic injury due to the treatments/procedures performed.

The analysis of mitotic index and of the number of apoptosis events (Tables 1 and 2, Figure 1) showed that the administration of lycopene or resveratrol before PH did not interfere with these parameters. Comparison of the mitotic and apoptotic indices of the control PH group to those of the lycopene and resveratrol groups revealed no significant difference, probably indicating that, under the experimental conditions of the present study, the two substances did not interfere with the processes of hepatic hyperplasia. Regarding transaminase levels, the normal control group showed values of 15.41 ± 4.71 U/L for AST and 58.72 ±27.22 U/L for ALT, statistically different values from those observed in the remaining groups (p˂0.05), confirming the structural injury due to PH (Figures 2 and 3).

Table 1
Mitotic index and apoptosis index for Partial Hepatectomy (PH2) and Resveratrol+Partial Hepatectomy hepatic tissues (RPH).

Mitotic index
PH24	RPH24	PH36	RPH36	PH48	RPH48
39.44±7.4	26.78±7.1	30.25±4.6	19.82±2.9	21.85±3.4	15.79±5.0
Apoptotic index
PH24	RPH24	PH36	RPH36	PH48	RPH48
0.36±0.3	1.00 ±1.0	2.23±3.3	4.62±4.8	9.62±8.3	10.78±10.3

• PH24, PH36 and PH48: Groups examined 24, 36 and 48 h after partial hepatectomy, respectively; RPH24, RPH36 and RPH48: Resveratrol-treated groups examined 24, 36 and 48h after partial hepatetomy, respectively. The Kruskal-Wallis Test and Dunn's post-test showed no significant difference when each group was compared to its respective control.

Table 2
Mitotic index and apoptosis index for Partial Hepatectomy (PH1), and Lycopene + Partial Hepatectomy hepatic tissues (LPH).

Mitotic Index
PH24	LPH24	PH36	LPH36	PH48	LPH48
14.67±9.7	23.45±5.5	7.34±1.3	12.44±6.4	10.46±2.0	9.22±3.5
Apoptosis Index
PH24	LPH24	PH36	LPH36	PH48	LPH48
0.49±0.4	0.36±0.7	1.01±0.9	1.80±1.4	5.93±5.1	8.64±6.4

• PH24, PH36 and PH48: Groups examined 24, 36 and 48 h after partial hepatectomy, respectively; LPH24, LPH36 and LPH48: Lycopene-treated groups examined 24, 36 and 48h after partial hepatetomy, respectively. The Kruskal-Wallis Test and Dunn's post-test showed no significant difference when each group was compared to its respective control.

Figure 2
Liver, Hepatocyte - Mitosis (asterisks) and Apoptosis (arrows) in Wistar rats. Control groups after 36 and 48 hours of partial hepatectomy (PH1 36, PH1 48, PH2 36 and PH 48, respectively). Lycopene or resveratrol groups, after 36 and 48 hours of partial hepatectomy (LPH 36, LPH 48, RPH 36 and RPH 48, respectively. Feulgen stain, x400.

Figure 3
Clinical parameters of rats submitted to Partial Hepatectomy, and Lycopene + Partial Hepatectomy. AST=Aspartate aminotransferase; ALT=Alanine aminotransferase. PH24, PH36 and PH48: Groups examined 24, 36 and 48 h after partial hepatectomy, respectively; LPH24, LPH36 and LPH48: Lycopene-treated groups examined at 24, 36 and 48 h, respectively. The Kruskal-Wallis test and Dunn's post-test showed no significant difference when each group was compared to its respective control. AST =15.4.± 4.71 and ALT =58.72± 27.2 for the Normal Control Group

Figure 4
Clinical parameters of rats submitted to Partial Hepatectomy, and Resveratrol + Partial Hepatectomy rats. AST=Aspartate aminotransferase; ALT=Alanine aminotransferase. PH24, PH36 and PH48: Partial hepatectomy groups 24, 36 and 48 hours, respectively; RPH24, RPH36 and RPH48: Resveratrol treated groupS 24, 36 and 48 hours, respectively. The Kruskal-Wallis test and Dunn's post-test showed no significant difference when each group was compared to its respective control. AST =15.4.± 4.71 and ALT =58.72± 27.2 for the Normal Control Group.

Discussion

Advances in molecular techniques over the past few decades have resulted in the development of regenerative medicine methods. Thus, liver regeneration and PH rat models have been used extensively to explore regeneration mechanisms, liver disease pathogenesis, and drug screening²⁹.

In this study, the absence of statistically significant results in the mitotic index and apoptosis events in the experimental groups suggests that both lycopene and resveratrol, previously administered to PH, did not interfere with hepatic hyperplasia and the experimental period was relatively short to allow the identification of fibrosis.

When the results for the PH groups were compared to their respective LPH or RPH groups (Figures 2 and 3) as a function of time after hepatectomy no significant changes were obseved, a fact that may permit us to raise the hypothesis that the two groups did not differ from one another in terms of transaminase levels.

PH is a surgical procedure leading to a tissue injury that can be verified by increasing serum transaminase levels. In our study, these levels were lower in the normal control group, which was expected.

Regarding transaminase levels, the normal control group showed values of 15.41 ± 4.71 U/L for AST and 58.72 ±27.22 U/L for ALT, statistically different values from those observed in the remaining groups (p˂0.05), confirming the structural injury due to PH.

Similarly, comparison of the results presented in Figures 2 and 3 showed that AST and ALT levels did not differ in the lycopene or resveratrol groups in relation to their respective controls. These data are different from those reported by Aidoud et al.³⁰ who observed a significant reduction of serum ALT, AST and alkaline phosphatase in a study on Wistar rats fed a lycopene-rich diet in combination with olive oil for four weeks. These authors concluded that such diet contributed to the amelioration of liver fuction disorders by modulating the hepatic enzyme levels and enhancing the antioxidant level of liver tissue.

Although in the present study resveratrol did not induce statistically significant changes in transaminase levels, this result does not indicate that resveratrol is inefficient for hepatoprotection. According to Walle et al.³¹: "in general, the doses of resveratrol have been higher in animals than in humans". Kirimlioglu et al.³² investigated the antioxidant status of rats after resveratrol treatment following 70% partial hepatectomy and reported that the group treated with 60 mg/day resveratrol 7 days before and 3 days after PH showed reduced glutathione and malondialdehyde levels, as well as reduced NO and interleukin-6 levels. These authors also concluded that resveratrol seemed to reduce the traumatic effects of PH and might be useful in donors and recipients undergoing living donor liver transplantation.

Various substances of plant origin have been studied in order to determine their proliferative action on hepatic tissue. Toydemir et al.³³ detected the antioxidative, antiapoptotic, and proliferative effect of curcumin on liver regeneration after partial hepatectomy in rats and concuded that curcumin had a beneficial effect on the regenerative capacity of remnant liver tissue. Yang et al.²⁹ explored the effect of fructus polygoni orientalis extract (EFPO) on liver regeneration and the proliferation of bone marrow cells in a rat model of partial hepatectomy and concluded that EFPO inhibited liver regeneration and liver repair after PH in rats. Lima et al.³⁴ assessed the effects of an aqueous extract of Hyptis fructicosa leaves on liver regeneration after 67% partial hepatectomy in rats and observed that, at the dose of 100 mg/kg/day, this extract can stimulate hepatic regeneration. These studies motivated the present investigation with licopene and resveratrol, which, in the present model, did not seem to interfere with the proliferative process of hepatocytes, also showing no antiapoptotic activity. According to Toydemir et al.³³, the role for apoptosis in the liver after hepatectomy seems to be controversial. At the peak of regeneration, apoptosis begins. Accompanying cell reproduction, cell apoptosis would eliminate the overgrown cells, and rebuilding of the constitution is achieved.

The absence of a proliferative and antiapoptotic activity observed for resveratrol appears to be compatible with its antioxidant capacity¹⁵. The latter is effective in organic disorders provoked by free radicals, something that does not occur significantly in PH. Licopene, in turn, has antiproliferative activity against cancer cells⁸; however, the metabolism of these cells is known to be quite different from that of "normal" cells, a fact that may justify the absence of proliferative (or antiproliferative) activity of licopene in the present study.

Conclusion

The absence of changes in transaminase levels does not mean that treatment with lycopene or resveratrol may not be useful as a preoperative measure in hepatic surgeries. It may be suggested that these substances probably do not interfere with the human liver, but are suitable for other therapeutic purposes.

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• Financial source:

  none
• 1
  Research performed at Laboratory of Biological Tests, Faculty of Nutrition, Pontificia Universidade Católica de Campinas (PUC-Campinas), Brazil.

Publication Dates

• Publication in this collection
  Mar 2017

History

• Received
  19 Nov 2016
• Reviewed
  17 Jan 2017
• Accepted
  21 Feb 2017