- Open Access
The protective effect of taurine and/or vanillin against renal, testicular, and hematological alterations induced by potassium bromate toxicity in rats
The Journal of Basic and Applied Zoology volume 80, Article number: 3 (2019)
Potassium bromate (KBrO3) causes toxicity in humans and experimental animals. The wide exposure to KBrO3 in water disinfection and as a food additive necessitates finding of available antidotes for its hazards as taurine and/or vanillin.
The present study was conducted to investigate the protective effects of taurine and/or vanillin against potassium bromate toxicity on renal, testicular, and hematological parameters in adult male albino rats.
For this purpose, 30 rats were divided as follows: control group, rats were fed balanced diet and served as normal control; group 2, rats were fed balanced diet and served as positive control; group 3, rats were fed balanced diet supplemented with taurine (100 mg/kg diet); group4, rats were fed balanced diet supplemented with vanillin (100 mg/kg diet); and group5, rats were fed balanced diet supplemented with taurine and vanillin at the same tested dose for 3 weeks. Groups from 2 to 5 were orally administered a single dose of KBrO3 (100 mg/kg diet) then sacrificed after 48 h.
Results showed that KBrO3 administration induces testicular damage reflected in a significant decrease in total protein, glycogen, sialic acid with a significant increase in MDA level in testicular tissue. Also, there was a significant decrease in total spermatic count accompanied by an increase in the total number of malformed sperms (head, tail, and head and tail) in the pot bromate intoxicated group. Also, KBrO3 toxicity induce renal damage manifested in a significant increase in serum urea, creatinine, uric acid, and xanthine oxidase activity. Renal TNF-α, IL-6, Hcy, and MDA significantly increased in the pot-bromate intoxicated group. Finally, hematological results showed a significant decrease in Hb%, MCV, RBCs, and WBCs count in the pot-bromate intoxicated group as compared to normal control groups. Histological findings showed that impaired renal and testicular histology was concomitant with biochemical parameters.
Treatment with taurine and/or vanillin showed a significant ameliorative effect against deleterious effects of pot bromate toxicity on hematological parameters, renal and testicular tissues. Moreover, the recorded improvement of the studied parameters in rats pretreated with taurine and vanillin as antioxidants proves their synergistic effect.
Potassium bromate (KBrO3) is used as a food additive. It acts for giving elasticity and strength to the dough during the baking process. It also used in beer making, cheese production, and is usually added to fish paste products. Additionally, it is used in pharmaceutical industries and cosmetics (Ahmad & Mahmood, 2016 Oloyede & Sunmonu, 2009).
Bromate is now considered as a human and animal carcinogen. Reactive oxygen species (ROS) and free radicals have been implicated in mediating KBrO3-induced toxicity. These radicals can induce tissue damage by reacting with macromolecules like proteins, nucleic acids, and lipids, which leads to tissue injury Ahmad et al., 2012 and 2013).
Vanillin (4-hydroxy-3-methoxybenzaldehyde) is the main constituent of vanilla. It is a phenolic phenylpropane C6-C1 carbonic structural derivative. It is found in many essential plant oils, principally Vanilla pompon, Vanilla planifolia, and Vanilla tahitensis (Priefert, Rabenhorst, & Steinbuchel, 2001). It is widely used in processed foods, pharmaceutical products, and in perfume (Zamzuri & Abd-Aziz, 2013). Previous studies showed that vanillin has antioxidant, anti-inflammatory, anti-carcinogenic, and inhibition mutagenesis (Bezerra, Nascimento Soares, & de Sousa, 2016).
Taurine is a sulfur-containing amino acid present in almost all animal tissues, most abundantly as a free intracellular amino acid in human cells (Kim, Gupta, & Lee, 2007). It is involved in numerous biological and physiological functions that exert important health benefits. Taurine acts as a cytoprotective agent in a variety of tissues. It also modulates a variety of cellular functions, including conjugation of bile acids, anti-oxidation, osmoregulation, modulation of ion movement, and modulation of neurotransmitters (Lourenco & Camilo, 2002). Also, taurine protects tissues from various pathological conditions resulting from free radicals generated upon exposure to various xenobiotics (Das et al., 2011).
Although many lines of substantiation supporting the beneficial effects of either vanillin or taurine against pathological conditions resulting from free radicals generated upon exposure to various xenobiotics, the synergistic effect of vanillin and taurine against renal, testicular, and hematological alterations have not been yet thoroughly investigated. Therefore, the present study was attempted to assess the protective effect of taurine and /or vanillin against KBrO3 toxicity on hematological parameters, renal and testicular tissue in experimental rats.
Materials and methods
KBrO3 was purchased from Alpha Chemika, India. Taurine and vanillin were purchased from Sigma Chemical CO, USA. All chemicals were of analytical grade.
Glycogen kits were purchased from Genway Biotech, INC, USA. The total sialic acid kit was purchased from Cell Biolabs, Inc., USA.Urea, creatinine, uric acid, and total protein kits were purchased from DIACHEM Ltd., Budapest, Attila. Xanthine oxidase and rats ELISA kits were purchased from CUSABIO, China. Tumor necrosis alpha (TNF-α) and interleukin-6 (IL-6) enzyme immunoassay kits were purchased from IBL Co., Ltd. Japan. Malondialdehyde (MDA) kit was purchased from Cell Biolabs, Inc., USA.
Forty adult male, Wistar strain albino rats weighing (200 ± 5 g) were purchased from a breeding unit of Medical Research Center (Faculty of Medicine, Ain Shams University). The rats were housed in individually under a controlled condition of temperature (25 ± 5 °C), humidity (50 ± 10%), and acclimatized to 12 h light/dark. The experimental period was 23 days on which food and water were provided ad libitum. An animal experiment was conducted according to the guidelines of the institutional animal ethics committee.
The basal diet was based on AIN-93 recommendations according to (Reeves, Nielsen, & Fahey, 1993).
The animals were randomly assigned into five experimental groups (each of eight). All international and local rules and regulation for handling animals in experiments were followed. The experimental groups illustrated as follows:
Control group: rats were fed the balanced diet and served as normal control.
Group 2: rats were fed the balanced diet and served as positive control.
Group 3: rats were fed balanced diet supplemented with taurine (100 mg/kg diet for 3 weeks (El-Houseini, El-Agoza, Sakr, & El-Malky, 2017).
Group4: rats were fed balanced diet supplemented with vanillin (100 mg/kg diet for 3 weeks (Shoeb, Chowta, Pallempati, Rai, & Singh, 2013).
Group5: rats were fed balanced diet supplemented with taurine and vanillin at the same tested dose for 3 weeks. Groups from 2 to 5 were orally administered a single dose of KBrO3 (100 mg/kg body weight) then sacrificed after 48 h (Ahmad, Naqshbandi, Fareed, & Mahmood, 2012).
At the end of the experiment, the animals were anesthetized with diethyl ether after 12 h fasting and whole blood samples were taken from the hepatic portal vein. The blood samples were divided into two tubes, the first tube contained EDTA for determination of blood picture. Blood sample in the second tube left for 15 min at 37 °C for serum separation, then centrifuged at 3000 rpm for 20 min, then sera were separated and kept in plastic vials at − 20 °C until analyses. Kidney and testis were removed, rinsed with cold saline, and dried with filter paper.
Preparation of testis homogenate
The tests were weighed and homogenized in ice-cold 0.25 M sucrose solution (1:5 w/v). The homogenates were centrifuged at 1500 rpm for 10 min in a refrigerated centrifuge TDL-5000B (Shanghai Anke company, Ltd., China). The supernatant was collected and stored frozen for analysis.
Preparation of kidney homogenate
Kidneys were weighed and homogenized in cold 5 mm sodium phosphate buffer. The homogenates were centrifuged at 1500 rpm for 15 min at 4 °C, and the supernatant was collected and stored frozen for analysis.
Sperm count and morphology
The two cauda-epididymis from each rat were dissected; each of them was minced in 2 ml 0.9% NaCl. The semen was carefully mixed; the epididymal fluid was subjected to sperm count using Neubauer hemocytometer (Belsey et al., 1980). Films were spread on clean dray slides, left to dry, and stained with HX&E stain for the examination of sperm morphology.
Total protein was analyzed by standard spectrophotometric methods according to Henry, Cannon, and Winkelman (1974). Glycogen was measured using a quantitative colorimetric method of Dalrymple and Hamm (1973); a total sialic acid kit was determined according to the calorimetric method as described by (Yao, Obuka, Mosuka, Kinuta, & Ikeda, 1989). Serum urea, creatinine, and uric acid were determined calorimetrically according to Tobacco, Meiattini, Moda, and Tarii (1979), Rock, Walker, and Jennings (1987), and Barham and Trinder (1972), respectively. Xanthine oxidase activity was measured by ELISA using rat xanthine oxidase ELISA Kits, catalog no, CSB-E13614r, according to the manufacturer’s instructions. Levels of TNF-α and IL-6 were measured using rat ELISA kits with monoclonal antibodies specific for rat TNF-α, and IL-6 according to Beutler, Greenwald, and Hulmes (1985) and Wong and Clark (1988) following manufacturer’s instructions. Homocysteine was measured by ELISA using rat homocysteine ELISA kit, catalog no, CSB-E13376r according to the manufacturer’s instructions. MDA was determined calorimetrically according to (Ohkawa, Ohishi, & Yagi, 1979).
Whole blood samples were analyzed with an automatic Vet abcTM Animal Blood Counter (Horiba ABX, Montpellier, France) using the hematology kits specified in that instrument (HoribaABX, France) according to the manufacturer’s instructions.
Kidney and testis were dissected and fixed at 10% neutral formalin fixative and tissues were processed and stained with hematoxylin and eosin (H&E) and examined under a light microscope.
The data were presented as means ± SD. One-way analysis of variance (ANOVA) followed by post-hoc least significant difference analysis (LSD) at (p < 0.05) was performed using the statistical package for social science (SPSS) version 9 to compare all treated groups. Differences were considered to be significant when (p < 0.05).
Results showed in Table 1 demonstrated that KBrO3 administration induces testicular damage reflected in a significant decrease in total protein, glycogen, and sialic acid in testicular tissue. This decrease in the previously mentioned parameters was accompanied by a significant increase in MDA level in testicular tissue. Also, there was a significant decrease in total sperm count accompanied by a significant increase in the total number of malformed sperms (Head, tail, and head and tail) in the pot-bromate intoxicated group as shown in Table 2. Also, results in Table 3 reported that KBrO3 toxicity induces renal dysfunction manifested in a significant increase in serum urea, creatinine, and uric acid. The results also revealed that KBrO3 toxicity induced renal damage via oxidative stress indicated in a significant elevation in serum xanthine oxidase activity, renal Hcy, and MDA levels. The results also demonstrated a significant increase in renal pro-inflammatory cytokines TNF-α and IL-6 in the pot bromate intoxicated group as compared to the normal control group as shown in Table 4. Finally, hematological results showed a significant decrease in Hb%, hemocrites (Hct), mean corpuscular volume (MCV), red blood corpuscles (RBCs), and white blood cells (WBCs) count in the pot-bromate intoxicated group as compared to normal control groups. Whereas, MCH concentration (MCHC) and platelet count showed no significant difference between pot-bromate treated group and control group . However, pre-treatment with taurine and/or vanillin showed a significant improvement in hematological parameters Tables 5, and 6).
Histological findings showed that KBrO3 toxicity impaired renal and testicular histology as shown in (Fig. 1 as compared to (Fig. 2) for testis and (Figs. 3 and 4) as compared to Fig. 5 for kidney that was concomitant with biochemical parameters. Pretreatment with either taurine or vanillin showed a partial recovery in seminiferous epithelium of testis as shown in (Figs. 6, 7 and 8). With respect to kidney, the histopathology results of KBrO3-treated rats showed inflammatory cell infiltration in the renal capsule, hypercellularity of glomerular tuft, a proteinaceous material in the lumen of renal tubules, and proteinaceous material in the Bowman’s space and the lumen of renal tubules (Figs. 3 and 4). Pretreatment with either taurine or vanillin showed a slight congestion in of the glomerular tuft and congestion of renal blood vessel as shown in (Figs. 9, 10, 11, and 12). On the other hand, pretreatment with taurine and vanillin in combination showed a significant ameliorative effect against deleterious alterations associated with KBrO3 toxicity in testicular and renal tissues. Nearly normal histological structure in the testicular section with complete spermatogenesis in (Fig. 13). Kidney of rat from group 5 showed almost normal structure of renal parenchyma with few degeneration of cell lining renal tubules (Fig. 14). Moreover, the best correction occurred in the animal group which was treated with both of them; this may be due to their synergistic effect.
The current study was attempted to examine the protective role of pre-treatment with taurine and/or vanillin in attenuating the deleterious effects of KBrO3-induced oxidative stress in testis, kidney, and hematology. Taurine and vanillin were selected as dietary compounds which are found in several foods and exhibits protective effects against certain environmental agents because of their antioxidant properties (Das, Roy, & Sil, 2012) and (Al Asmari, Al Shahrani, Al Masri, Al Faraidi, Elfaki, & Arshaduddin, 2016). The use of such dietary compounds like taurine or vanillin offers a great potential as they are part of the normal diet and can be safely taken by persons who are at risk of exposure to toxicants.
Testicular secretory constituents like glycogen, total protein, and sialic acid are valuable in evaluating testicular functional capacity (Gupta, Kachhawa, & Chaudhary, 2004). Protein biosynthesis is vital in spermatogenesis and testicular development. Sertoli cells regulate the spermatogenic process of synthesizing proteins required for germ cell maturation (Weinbauer, Luetjens, Simoni, & Nieschlag, 2010). The reduction in testicular protein content in the positive control group may be attributed to disturbances in protein synthesis or metabolism induced by KBrO3 toxicity. The previous results of Geeta and Gyan (2015) supported the results of the current study reporting that KBrO3 toxicity induced a significant decrease in protein content in the testis.
Glycogen is a crucial requirement for proper testicular functioning and development; it acts as a modulator of germ cell survival (Villarroel-Espíndola et al., 2013). The decreased testicular glycogen in the pot-bromate intoxicated group may be due to inhibition of enzyme activity in the synthesis of glycogen. Reduction in glycogen level after KBrO3 administration inhibited the glycogen synthesis, which eventually decreases spermatogenesis (Joshi, Mathur, & Gulati, 2007).
Sialic acid is a derivative of N-acetylmannose and an important constituent of glycolipids and glycoproteins. Results demonstrated that KBrO3 toxicity induced a significant decrease in testicular sialic acid as compared to the normal control group. This decline in testicular sialic acid level may be due to a decrease in the rate of spermatogenesis. The result of the current study supported by the previous results of Nwonuma, Irokanulo, Iji, Alejolowo, and Adetunji (2016) reported a significant decrease in testicular glycogen, total protein, and sialic acid in the pot-bromte intoxicated rats. However, the pretreated groups with taurine and/or vanillin showed a recovery in protein,glycogen, and sialic acid levels, which may imply that these compounds have the potential to enhance synthesis of testicular secretory constituents.
KBrO3 toxicity induces a significant increase in MDA level in testicular tissue as compared to control group. Whereas, pretreatment with taurine and/or vanillin restored MDA to levels more or less similar to that of control group rats. The deterioration in sperm biochemical parameters might be correlated with enhanced lipid peroxidation. The results obtained by Acharya, Mishra, Patro, and Panda (2008) supported the results of the current study reporting that generation of reactive oxygen species (ROS) by KBrO3 toxicity and subsequent oxidative impairment may increase sperm deformation. However, supplementation with taurine and/or vanillin led to a significant elevation in total sperm count concomitant with a significant decrease in malformed sperm (total, head, tail, and head and tail). This improvement in spermatic profiles could be attributed to the antioxidant property of taurine and/or vanillin, which may induce an increase in testicular spermatogenesis indicating elevation in differentiated germ cells number.
These data are in harmony with those obtained from Hassanein (2011)who attributed the elevation in the total number of sperms correction in the number of malformed sperms (total, head, tail, and head and tail) after treatement with taurine to the antioxidant potential of taurine which acts to scavenge free radicals and decrease lipid peroxidation production. Similar results obtained from Abdel-Twab, Mohamed, and Mahmoud (2016) and Mohamed and Gawad (2017) confirmed that taurine intake showed a significant improvement in the sperm counts and motility, degenerative changes of the seminiferous tubules, and spermatogenesis.
The histopathological finding of testis strongly supports the alterations in biochemical parameters of the testicular function. The histopathological observations showed testicular cellular degeneration and subsequently impaired spermatogenesis in positive control compared to taurine and/or vanillin pretreated animals which showed normal cell due to their protective effect. The results of Gameel, Aboagla, Fadul, and Elsheik (2016) are in accordance with the result of the current study. The author reported that exposure to KBrO3 alters the histology of the rat testis and impaired spermatogenesis. The antioxidant effect of taurine and its protective effect against apoptosis and germ cell degeneration resulting from testicular torsion was reported by Aydos, Başar, Kul, Atmaca, Uzunalioğlu, Kisa, & Efe, 2014).
Renal injury due to KBrO3 intoxication could be evaluated by assessment of serum urea, creatinine, and uric acid, which were used as early indicators of renal dysfunction (Nabavi et al., 2013). The significant increase in serum urea, creatinine, and uric acid in the pot bromate-treated rats indicate the development of renal dysfunction and reduced glomerular filtration rate. The increase in uric acid level also may be due to degradation of purines and pyrimidines which strongly related to the significant increase in xanthine oxidase activity resulted in overproduction of uric acid. The increase in xanthine oxidase activity does not only catalyze the formation of uric acid but also generate ROS. Therefore, the elevated xanthine oxidase activity could explain the association between pot-promote toxicity and both hyperuricemia and increased ROS production.
Additionally, homocysteine at elevated levels is associated with oxidative stress and lipid peroxidation leading to renal cell damage Zhang, YLand, & Kamin, 2004). The free sulfhydryl group of homocysteine is auto-oxidized and generates reactive oxygen species such as superoxide and hydrogen peroxide. That liberated ROS could initiate lipid peroxidation (Wang, Tan, & Yang, 2005).
In the present investigation, KBrO3-treated rats exhibited a higher renal homocysteine and lipid peroxide level as compared to the negative control group, clearly signifying the existence of oxidative stress. This increase in lipid peroxidation may lead to a progressive diminution of glomerular function eventually leading to renal dysfunction. However, pretreatment with taurine and or vanillin significantly decreased the level of homocysteine and lipid peroxides (MDA) in renal tissue. This normalization may be due to free radical quenching nature of taurine and/or vanillin, preventing the lipid peroxidation. In the same trend, results of Oliveira et al. (2014) and Al Asmari et al. (2016) reported that vanillin, like other polyphenols of plants, is a potent free radical scavenger as it contains different functional groups including the phenolic group.
Pro-inflammatory cytokines, including tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6), are thought to act as a central factor in the pathophysiology of chronic kidney disorders (Stenvinkel, Ketteler, & Johnson, 2005). ROS can induce inflammatory processes by activation of transcription factors, which induce secretion of pro-inflammatory cytokines including IL-6 and TNF- α (Valério et al., 2009).
In this study, results illustrated that KBrO3 induced an inflammatory reaction indicated by increasing renal TNF-α and IL-6 levels. However, treatment with taurine and/or vanillin prior KBrO3 administration suppressed the overproduction of TNF-α and IL-6 in renal tissue provided a protective effect against kidney pathological changes.
Interestingly, the observed results show that pretreatment of rats with vanillin also caused the apparent reduction in levels of proinflammatory cytokines such as IL-6 and TNF-α. This is in accordance with the previous results obtained by Katary and Salahuddin (2017) who reported that pre-treatment with vanillin resulted in a normalization in tissue gastric levels of inflammatory cytokines TNF-α in indomethacin-induced gastric ulcer rats indicating the anti-inflammatory action of vanillin.
The histopathology results of KBrO3-treated rats showed pathological alterations in the renal capsule, the Bowman’s space, and the lumen of renal tubules. On the other hand, pretreatment with taurine and/or vanillin markedly ameliorated the significant pathological changes provoked by KBrO3 administration. This could be attributed to the antioxidant and anti-inflammatory potential of taurine and/or vanillin, which significantly reduced the oxidative stress, leading to restoration of the normal physiological state of kidney cells. Further, membrane-stabilizing properties of taurine may provide additional improvements in these pathological alterations in renal tissue of the KBrO3-treated rats. Similar observations have been reported in the previous study of Ben Saad et al. (2016) which confirmed that vanillin treatment (100 mg/kg/day for 15 days) restored histopathological changes in KBrO3-induced kidney damage.
In the present study, it was observed that KBrO3-induced hematological changes which were ameliorated in the group pretreated with taurine and/or vanillin. Decreased RBC counts observed in the present study may be due to harmful effects of KBrO3 on bone marrow and hematopoietic organs. Moreover, oxidative stress plays a major role in damaging the RBC membrane and subsequent impairing its deformability. Oxidative stress also contributes to the removal of deformed RBCs from circulation by macrophages (Mohanty, Nagababu, & Rifkind, 2014).Whereas, Hb and Hct concentrations may have been associated with the formation of methemoglobin, a form of Hb, which has a decreased ability to bind oxygen. Corroborating with these results of Dhembare and Dale (2017) revealed that KBrO3 treatment induces a significant decrease in Hb, Hct, and MCV values with the concomitant decrease in WBCs and RBCs count.
From the obtained results, it is clear that pretreatment with taurine and/or vanillin restored alterations induced by KBrO3 toxicity in hematological parameters. In the same trend of the results of the current study, Ahmad and Mahmood (2014) reported that the protective effect of taurine administration KBrO3 against Hb oxidation and oxidative stress induced by KBrO3 treatment. Also, the potential protective effect of vanillin on hematological parameters against alterations induced by metribuzin was demonstrated in a study by (Messarah et al., 2017).
Pretreatment with taurine and/or vanillin showed a significant ameliorative effect against deleterious alterations associated with KBrO3 toxicity in hematological parameters, renal and testicular tissues. Moreover, the recorded improvement in the studied parameters of rats pretreated with both antioxidants in combination proves their synergistic effect.
- KBrO3 :
Mean corpuscular hemoglobin
Mean corpuscular volume
Red blood corpuscles
Reactive oxygen species
Tumor necrosis alpha
White blood cells
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The authors are greatly thankful to Prof. Dr. Mai Helmy Abdel-Gawad professor in Zoology Department, Faculty of Women’s For Art, Science And Education, Ain Shams University, Egypt and prof. Dr.Kawkab, A Ahmed, professor of pathology, pathology department, veterinary medicine, Cairo University for their helping in histological examination
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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The datasets supporting the conclusions of this article are included within the article and its additional files.
This study follows the Declaration of Helsinki and the guidelines for the care and use of experimental animals established by the Committee for the Purpose of Control and Supervision of Experiments on Animals. Animal procedures were also made in accordance with the National Institutes of Health (NIH) protocol approved by Ain Shams University.
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Mohamed, E.A.K., saddek, E.A. The protective effect of taurine and/or vanillin against renal, testicular, and hematological alterations induced by potassium bromate toxicity in rats. JoBAZ 80, 3 (2019). https://doi.org/10.1186/s41936-018-0070-2
- Potassium bromate
- Protective effect