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 Table of Contents  
ORIGINAL ARTICLE
Year : 2019  |  Volume : 8  |  Issue : 2  |  Page : 217-223

Effect of sodium benzoate on liver and kidney lipid peroxidation and antioxidant enzymes in mice


1 Department of Pharmacology and Toxicology, Shiraz University of Medical Sciences, Shiraz, Iran; Student Research Committee, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
2 Student Research Committee, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
3 Department of Pathology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
4 Department of Pharmacology and Toxicology, Shiraz University of Medical Sciences, Shiraz, Iran

Date of Web Publication30-Oct-2019

Correspondence Address:
Dr. Marzieh Rashedinia
Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, 71987-54361.
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jrptps.JRPTPS_68_18

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  Abstract 

Introduction: Sodium benzoate (SB), as a chemical preservative, is used in many kinds of foodstuff. Some studies reported toxicity effects of SB in food products and suggested to limit its usage. The aim of this study was to evaluate the effects of oral administration of SB on antioxidant enzymes and lipid peroxidation in the liver and kidney of mice. Materials and Methods: A total of 24 animals were divided into four groups: Control group and three treated groups that received 150, 300, and 600 mg/kg/day of SB, respectively, in drinking water for 4 weeks. The malondialdehyde level, glutathione (GSH) content, superoxide dismutase (SOD), and catalase (CAT) activities of the liver and kidney were measured and the results of the treated groups were compared with those of the control group (one-way analysis of variance). Results: Results showed that SB caused histological alterations in the liver and kidney tissues. Moreover, SB significantly increased lipid peroxidation and GSH content in the kidney tissues (P < 0.05). Also, CAT activity significantly declined in the kidney (P < 0.05), without changing the SOD activity, but SB did not have any effect on the biochemical parameter of the liver tissue. Conclusion: The results of this study showed that SB caused kidney injury more than liver injury, but as a food preservative, which is consumed for a long period of life, it may cause liver damage additionally. For that reason, the excessive SB intake in the food is disturbing.

Keywords: Antioxidant enzymes, kidney, lipid peroxidation, liver, sodium benzoate


How to cite this article:
Khodaei F, Kholghipour H, Hosseinzadeh M, Rashedinia M. Effect of sodium benzoate on liver and kidney lipid peroxidation and antioxidant enzymes in mice. J Rep Pharma Sci 2019;8:217-23

How to cite this URL:
Khodaei F, Kholghipour H, Hosseinzadeh M, Rashedinia M. Effect of sodium benzoate on liver and kidney lipid peroxidation and antioxidant enzymes in mice. J Rep Pharma Sci [serial online] 2019 [cited 2019 Nov 15];8:217-23. Available from: http://www.jrpsjournal.com/text.asp?2019/8/2/217/269952




  Introduction Top


Sodium benzoate (SB) is a chemical preservative, which inhibits the activity of the microorganisms in very low concentration, and has been generally recognized as a safe food preservative.[1],[2] SB is used in carbonated beverages, syrups, salted margarine, olives, sauces, relishes, jellies, jams, preserves, pastry and pie fillings, low-fat salad dressing, fruit salads, prepared salads, and in the storage of vegetables.[3],[4] The current maximum usage level permitted is 0.1% in food.[5] SB inhibits the growth of bacteria, yeast, and mold.[6]

Some studies reported toxicity effects of SB in food products and suggested that its usage should be limited.[7] SB reacts with ascorbic acid and produces benzene that is a carcinogen although SB carcinogenicity is ruled out.[8],[9] Other researchers showed that benzoate metabolizes in the liver and conjugates with glycine and converts into hippuric acid.[10],[11] In fact, glycine acts as a detoxifying agent, and glycine deficiency in the body causes a decrease in creatinine, glutamine, urea, and uric acid level.[11],[12] Also, there is some evidence showing that SB may metabolize to benzene, which leads to mitochondrial DNA destruction.[2],[13]

Some reports from animal models indicated that short-term administration of SB caused a significant elevation in remarkable serum enzymes including alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase,[14] suggesting the harmful effects of SB on the hepatic and renal functions.[13]

Oxidative stress is a term in biology, indicating that imbalance in the system of peroxide/antioxidant leads to cell damage.[15] In natural conditions, aerobic metabolism produces peroxide such as reactive oxygen species (ROS), which is scavenged by antioxidants.[16],[17],[18] The toxic effects of ROS lead to lipid peroxidation (LPO) and production of 4-hydroxynonenal and malondialdehyde (MDA). The results of LPO induce oxidative damage in the tissues.[19],[20] The antioxidant defense system of the cells that protect against oxidative stress, including superoxide dismutase (SOD), catalase (CAT), and glutathione (GSH), eliminates the excessive ROS.[21]

On the basis of the studies about the toxic effects of SB on the liver and kidney and also the essential role of the cellular antioxidant defense system in the function of important organs such as the liver and kidney, the aim of this study was to figure out the effect of short-term oral exposure of SB on tissue antioxidant indices, including GSH and LPO levels and the SOD and CAT enzyme activity in the liver and kidney of mice.


  Materials and Methods Top


Chemicals

5,5’-dithiobis 2-nitrobenzoic acid (DTNB), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), pyrogallol, and ammonium molybdate ((NH4)6Mo7O24.4H2O) were purchased from Sigma-Aldrich (St. Louis, Missouri). Thiobarbituric acid (TBA), SB, trichloroacetic acid (TCA), and hydroxymethyl aminomethane (Tris) were obtained from Merck (Darmstadt, Germany).

Animal treatment

In our procedure, male BALB/c mice weighing approximately 25–30g were provided from the Center of Comparative and Experimental Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. Also, the animal care and use were performed in accordance with the institution guidelines approved by the Shiraz University of Medical Sciences Animal Care and Use Committee (95-01-21-11700). Animals were kept in standard cages with a 12-h darkness interval, temperature (23 ± 2°C), and free access to food and water.

Twenty-four animals were randomly divided into four groups: Control mice received tap water and three treated groups received various concentrations of SB (0.1125%, 0.225%, and 0.56%) in drinking water for 4 weeks. The SB doses were in the experimental groups considering the doses mentioned in the literature[13],[22] and our previous study.[23] The animals’ body weight and water consumption were recorded before and after the animal treatment every 3 days. SB was administered considering the average of body weight and water consumption of each group; every mouse used approximately 150, 300, or 600 mg/kg/day SB in three groups of treatment.

After 4 weeks of treatment, the mice were anesthetized and killed by decapitation; also, their liver and kidney were removed rapidly and washed in a cold saline solution.

Histopathological examination

The kidney and a sample of liver were fixed in a formalin solution (10%) for tissue histopathological evaluation, and also the rest of the tissues were frozen in liquid nitrogen and stored at −80°C until assayed. Paraffin-embedded sections (5 μm) of the liver and kidney were prepared and stained with hematoxylin and eosin (H&E).

Malondialdehyde measuring method

MDA is a LPO index. MDA reacts with TBA in acidic pH to form a pink-colored complex and this complex has maximum absorption in 532 nm.[24] A total of 200 µL of 10% TCA was added to 200 µL of 10% homogenate tissue; then, 100 µL HCl (0.5N) and 200 µL of 0.6% TBA aqueous solution were mixed and shaken, and the mixture was heated in boiling water bath for 45min. After cooling, the mixture was centrifuged and the absorbance of supernatant was read in 532 nm. MDA levels were expressed as nmol/g tissue.

Glutathione measuring method

The tissue GSH content reacts with 5,5’-dithiobis 2-nitrobenzoic acid (DTNB) reagent to form a compound that is absorbed in 412 nm.[25] A total of 100 µL of supernatant of homogenated tissue was added to 500 µL of sodium phosphate buffer with pH, 8; next, 100 µL of DTNB was added and its absorbance was measured in 412 nm. The level of GSH in the samples was reported as µmol/g tissue.

Catalase activity measuring method

For measuring the activity of CAT enzyme according to a previous study,[26] 0.2mL supernatant of the homogenated tissue was incubated in 1.0mL substrate (65 µmol/mL H2O2 in 60 mmol/L sodium–potassium phosphate buffer, pH 7.4) at 37°C for 60s. The enzymatic reaction was stopped with 1.0mL of 32.4 mmol/L (NH4)6 Mo7O24.4H2O, and the yellow complex of molybdate and hydrogen peroxide was measured at 405 nm. The enzyme activity was reported as the percentage of the control group.

Superoxide dismutase activity measuring method

For measuring the activity of SOD enzyme, we used the Madesh and Balasubramanin method.[27] The reaction mixture contained 325 µL phosphate buffered saline (0.1M, pH 8.5), 30 µL 3-(4-5-diethylthiazol 2-xl 2,5 diphenyltetrazolium bromide (MTT; 1.25mM), 75 µL pyrogallol (100 µM), and 10 µL tissue supernatant, which was incubated at room temperature for 5min and the reaction was stopped by adding 375 µL of dimethyl sulfoxide. The absorbance was read at 570 nm, and the enzyme activity was reported as the percentage of the control group.

Statistical analysis

Results are shown as mean ± standard error of mean (SEM) for six animals in each group. Comparisons between multiple groups were made by a one-way analysis of variance followed by Fisher’s least significant difference test. Differences were considered significant when P <0.05. GraphPad Prism 6 software (GraphPad Software, San Diego, California) was used for the statistical analysis.


  Results Top


The Food and Drug Administration (FDA) acceptable concentration of SB in food is 0.1%. In this study, the concentration of SB in water equaled to 0.1125%, 0.225%, and 0.56%, which was close to the FDA-permitted concentration in the food. Therefore, according to the volume of water consumption, the daily intake of SB was approximately 150, 300, and 600 mg/kg in the mice. The result showed treatment with SB had no effects on the water consumption and the body weight, as previously observed.[23]

[Figure 1] presents morphological changes of the liver and kidney tissues in the SB treatment groups (150, 300, and 600 mg/kg) by H&E staining.
Figure 1: Morphological changes of the liver tissue. (A) Control group. (B) 150 mg/kg Sodium benzoate. (C) 300 mg/kg Sodium benzoate. (D) 600 mg/kg Sodium benzoate. Morphological changes of the kidney tissues. (E) Control group. (F) 150 mg/kg Sodium benzoate. (G) 300 mg/kg Sodium benzoate. (H) 600 mg/kg Sodium benzoate. After 4 weeks of treatment. Hematoxylin and eosin staining, ×400 magnification

Click here to view


It was observed that 300 and 600 mg/kg of SB caused histological alterations in the liver, such as focal acute inflammation and moderate portal inflammation in the hepatocytes, respectively. Also, SB at a dose of 600 mg/kg caused mild interstitial inflammation.

Hypertrophy of the hepatocytes in the periportal area was a characteristic feature in the liver of treated mice with SB at doses of 300 and 600 mg/kg. The histology of the liver, in 150 mg/kg of SB, was the same as the control groups; the central vein and normal hepatocyte were evident. In addition, the kidney of the mice receiving 150 and 300 mg/kg SB was similar to that of the control group, with no change in the glomeruli and tubes, vessels, and interstitium. However, SB 600 mg/kg induced mild to moderate inflammation in the kidney tissues.

As shown in [Figure 2], all doses of SB increased the LPO significantly in the kidney tissue in comparison with the control group (P <0.05). However, no significant difference was observed in the liver of all SB groups compared to that of the control group. In [Figure 3], the level of GSH in the liver and kidney of mice exposed to different doses of SB (150, 300, and 600 mg/kg) are compared with the control group. It showed that, in all of SB dosages, the GSH content of the kidney was increased. However, none of the doses showed significant differences in the liver tissue.
Figure 2: Malondialdehyde (MDA) level in the kidney and liver of animals in the control and experimental groups. Values are mean ± standard error of mean (SEM) (n = 6). SB = sodium benzoate. *Significant difference (P < 0.05), **significant difference (P < 0.01), ***significant difference (P < 0.001) compared with the control group

Click here to view
,
Figure 3: Glutathione (GSH) content in the kidney and liver of animals in the control and experimental groups. Values are mean ± standard error of mean (SEM) (n = 6). SB = sodium benzoate. ***Significant difference (P < 0.001) compared with the control group

Click here to view


In [Figure 4], the antioxidant activity of CAT in the liver and kidney of mice exposed to different doses of 150, 300, and 600 mg/kg is compared with the control group. The activity of CAT enzyme in the kidney of the mice at doses of 150, 300, and 600 mg/kg was 85.03, 70.86, and 75.39%, respectively, which showed a significant decrease compared to is compared with the control group (P <0.05). As indicated in [Figure 4], with increasing SB dosage, no change in the liver CAT activity was seen.
Figure 4: Catalase activity in the kidney and liver of animals in the control and experimental groups. Values are mean ± standard error of mean (SEM) (n = 6). SB = sodium benzoate. ***Significant difference (P < 0.001) compared to the control group

Click here to view


In [Figure 5], the antioxidant enzyme activity of SOD in the liver and kidneys of the mice exposed to different doses of 150, 300, and 600 mg/kg is compared with the control group. As indicated in the figure, with the increase in SB doses, the activity of the SOD enzyme in the liver and kidney showed no significant changes.
Figure 5: Superoxide dismutase (SOD) activity in the kidney and liver of animals in the control and experimental groups. Values are mean ± standard error of mean (SEM) (n = 6). SB = sodium benzoate

Click here to view



  Discussion Top


According to the mentioned studies about the toxic effects of SB and also the widespread use of this food additive in drinks, pharmaceutical and cosmetics products, the aim of this study was to investigate the effect of SB on MDA and GSH levels, SOD, and CAT activities as antioxidant indicators in the mice kidney and liver.

Results showed that SB caused histological alterations in the liver and kidney tissues. Moreover, SB significantly increased LPO and GSH content in the kidney tissues. Also, CAT activity significantly declined in the kidney. Moreover, SB significantly increased LPO and GSH content, declined CAT activity, Without changing the SOD activity in the kidney tissues. but SB did not have any effect on the biochemical parameters of the liver tissue.

Although there are some short-term studies on subacute and high-dose toxicity of SB in rats and mice, they described lethality or change in the organs and body weight,[28],[29],[30] but the mechanism or cause of SB toxicity is not well known. This study revealed that the intake of SB in drinking water for 4 weeks produced histological alterations in the liver and kidney tissues. Most of the previous studies reported histological damages to the liver. Swelling, hemorrhage, and syncytium formation of some hepatocytes were similarly stated by Fujitani.[29] Changes in the tissue and accumulation of cell debris induced inflammatory cell responses to injuries, whereas studies on the renal effects of SB have been less considered. We also observed histopathological changes in the kidney sections. Furthermore, SB significantly increased the LPO and GSH content in the kidney tissues. Moreover, CAT activity significantly declined in the kidney, without any changes in the SOD activity. However, SB did not have any effect on biochemical parameter of the liver tissue.

Although increase of oxidative damage in the liver of treated animals was not significant, examination by light microscopy revealed histological changes in the highest treatment group. The results suggested that the hepatotoxic effects of SB in exposure for a long time may induce severe damage in the liver.

Similar to these results, Bakar and Aktac[30] found the nuclei and basal membrane injury of the tubular cells, degeneration in the glomerular structure, and visceral epithelial injury in the renal tissues by light microscopy. Electron microscopy showed hepatocytes membrane injury, degradation in nuclear membrane and also crista loss in the mitochondria, and fusion in outer membranes of mitochondria vacuolization, which were the result of administration of SB in organs and body (2442 mg/kg body weight) for 10 days in rats.[30]

The kidney is a highly vulnerable organ to ROS injury, probably due to the abundance of long-chain polyunsaturated fatty acids in the composition of the lipids of the renal cells.[31] The results of our study showed that kidney damage was greater than the liver damage in the mice treated with SB because the level of LPO significantly increased in the kidney.

However, the effects of SB on the level of liver LPO did not show any significant change, which may be due to the high level of antioxidant defense system in the liver that prevents damage to this tissue.

The kidney GSH content, parallel to the kidney oxidative damage, significantly increased; probably, it is a compensatory mechanism to prevent the kidney damage. SB in all various doses (150, 300, and 600 mg/kg) did not change the liver GSH content because it did not make significant oxidative damage in the liver. Therefore, there was no need to increase the hepatic GSH content or other antioxidant enzyme activity in the liver.

The results of CAT enzyme activity in the kidney tissues showed that all doses of SB significantly decreased its activity in comparison to the control group. This is the same as the results of the previous study about the effect of SB on the CAT activity of the erythrocytes.[32] They have suggested that the decrease in SOD, CAT, Glutathione peroxidase, and GST activities in the erythrocytes by SB might be due to the damage in these antioxidant enzymes by superoxide anions.[32]

No statistically significant changes in SOD activities were observed in the liver and kidney after SB administration. Also, it was found that other detoxification systems and enzymes such as thioredoxin and GSH peroxidase have important roles in redox homoeostasis in the mammals.[33],[34] These results suggest that perhaps the mentioned system is more important than SOD for detoxifying SB-induced oxidative stress in the liver and kidney. In addition, different organ tissues have various antioxidant capacities to cope with oxidative stress, as previously we observed a reduction in the GSH content and an increase in the MDA level in the brain of the mouse that had used SB. Also, SB treatment showed learning and memory deficits in the behavioral tests.[23]

Based on Oyewolee et al.’s study (2012), two weeks of oral administration of 200 mg/kg SB caused some harmful effects on the rat liver and kidney functions. Also, administration of the Azadirachta indica leaves extract could act as a prophylactic agent against adverse effects of SB on considerably increasing serum level of ALT, AST, creatinine, urea, and uric acid.[13] Although this study evaluated the hepatorenal toxicity of SB, they only evaluated the serum biomarkers of the liver and kidney injury of one dose of SB, so other parameters such as liver and kidney oxidative stress damages in different doses were not considered.

However, there were some limitations in our study and further examination is required to provide an insight into specific hepatic and renal effects of SB. The mitochondria is an important organelle in the control of cell survival and death and plays a role in the oxidative stress, which could be evaluated. Also, the level of ROS in the cytosolic and mitochondrial fractions of the hepatic and renal cells could be measured.


  Conclusion Top


SB after oral administration in drinking water causes kidney damage more than liver injury. In the liver, further active antioxidant system could protect the cells against oxidative stress; however, in the kidney, in spite of the increasing antioxidant GSH to fight oxidative stress, LPO is induced by SB. However, the consumption of SB for a long period may also cause liver damage. As SB is a preservative used in various food products for a long time, renal damage has possibly resulted from the excessive intake of high dose or chronic consumption of this food additive.

Acknowledgement

We wish to thank Dr. Nasrin Shokrpour (Research Consultation Center [RCC] of Shiraz University of Medical Sciences) for English review of the manuscript.

Financial support and sponsorship

This work was financially supported by the vice chancellor of research affairs of Shiraz University of Medical Sciences, Student research committee (Grant number: 95-01-21-11700).

Conflicts of interest

There are no conflicts of interest.



 
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