Abstract
Deltamethrin is a type-II pyrethroid synthetic insecticide that is extensively used for controlling mosquitoes, flies, pests, and insects worldwide. This study was carried out to evaluate the likelihood protective effects of rutin, a natural antioxidant, against deltamethrin-induced liver and kidney toxicities in rats. Hepatotoxicity and nephrotoxicity were evaluated after the rats were treated orally with deltamethrin (1.28 mg/kg b.w.) alone or with rutin (25 and 50 mg/kg b.w.) for 30 days. Deltamethrin administration caused an increase in lipid peroxidation level and a decrease in activities of SOD, CAT, GPx, and GSH levels in the both tissues. Deltamethrin also increased serum ALT, AST, ALP, urea, and creatinine levels, while reduced nephrine levels in rats. In addition, deltamethrin increased the activation of inflammatory and apoptotic pathways by decreasing Bcl-2 and increasing TNF-α, NF-κB, IL-1β, p38α MAPK, COX-2, iNOS, beclin-1, Bax, and caspase-3 protein levels and/or activities. Furthermore, deltamethrin increased mRNA expression levels of PARP-1, VEGF, and immunohistochemical expressions of c-fos in the tissues. Rutin treatment significantly improved all examined parameters and restored the liver and kidney histopathological and immunohistochemical alterations. These findings demonstrate that rutin could be used to ameliorate hepatotoxicity and nephrotoxicity associated with oxidative stress, inflammation, and apoptosis in deltamethrin-induced rats.
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Introduction
Exposure to environmental pollutants such as pesticides, xenobiotics, heavy metals, and radiation has deleterious effects on human health and causes serious pathophysiological disorders. In particular, the rate of pesticides usage (including insecticides) due to their broad-spectrum bioactivity and low prices is alarming in countries where the main source of the economy is agriculture (Arora et al. 2016). Humans are potentially exposed to pesticides either directly, as farmers and agricultural workers, or indirectly, through the ingestion of contaminated food (Abdel-Daim and El-Ghoneimy 2015). Therefore, the intense use of pesticides can cause severe ecological threats and likelihood health issues, such as acute, subacute, and chronic human and animal poisoning (Maalej et al. 2017).
Among pesticides, pyrethroid insecticides are one the most important classes of insecticides worldwide and account for more than 17% of the global agrochemical market (Li et al. 2017; Morgan et al. 2018). Deltamethrin is a broad-spectrum type-II synthetic pyrethroid insecticide, widely used to protect agricultural crops, fruits, and vegetables against pests including as beetles, mites, ants, and weevils (Abdel-Daim et al. 2013; Caglayan et al. 2020; Caglayan et al. 2019c). Accumulating evidence demonstrated that deltamethrin is readily absorbed through contaminated food and water (Ahmadvand et al. 2016; Barlow et al. 2001). Despite its rapid metabolism and low toxicity, recent studies have shown that chronic exposure to deltamethrin can cause adverse effects such as hepatotoxicity (Maalej et al. 2017), nephrotoxicity (Abdel-Daim and El-Ghoneimy 2015), neurotoxicity (Khalatbary et al. 2015), infertility (Abdallah et al. 2010), and metabolic disorders (Rjeibi et al. 2016). The accumulation of deltamethrin particularly in liver and kidney tissues increases the generation of the reactive oxygen species (ROS). Increased ROS damages proteins, nucleic acids, and lipids (Ahmadvand et al. 2016; Gulcin 2020; Gülçin 2012; Maalej et al. 2017).
In humans, deltamethrin acts as a pediculicide. The main toxic effects of deltamethrin are known as hyperexcitability, choreoathetosis, and salivation. These effects usually begin quickly and last for a short time. However, there is one reported case of human death involving a 30-year-old man who died 2 days after consuming approximately 30 ml of deltamethrin. Previous studies of deltamethrin metabolism in rats have been known to involve esterase-mediated cleavage of the ester linkage and ring hydroxylation by cytochrome P450s (Ding et al. 2004; Mirfazaelian et al. 2006). A prior study has reported that 27% of a 2.4 mg/kg intravenous dose of deltamethrin was excreted in the feces of female rats, possibly as metabolites (Ruzo et al. 1978).
Rutin is a flavonoid glycoside found in fruits and fruit peels, predominantly in citrus fruits such as grapefruit, oranges, and lemons. It is also present in spinach, onions, apples, buckwheat seeds, tea, and wine (Çelik et al. 2020; Nafees et al. 2015). It has several pharmacological properties such as anti-inflammatory, antioxidant, antihypertensive, antiulcer, antiallergic, anticarcinogenic, anti-mutagenic, immunomodulator, and potent scavenger of superoxide radicals (Caglayan et al. 2019b; Kandemir et al. 2020a; Nafees et al. 2015). Rutin has been documented to alleviate liver and/or kidney injuries induced by various toxic agents, including mercuric chloride (Caglayan et al. 2019a; Caglayan et al. 2019b), lead acetate (Ansar et al. 2016), carbon tetrachloride (Hafez et al. 2015), potassium bromate (Khan et al. 2012), acrylamide (Ahmed and Ibrahim Laila 2018), and hexachlorobutadiene (Sadeghnia et al. 2013).
Keeping in view the protective effects of rutin, the present study was designed to investigate the probable protective effects of rutin against deltamethrin-induced hepatotoxicity and nephrotoxicity in male rats.
Materials and methods
Chemicals
Deltamethrin (C22H19Br2NO3) is a synthetic pyrethroid insecticide (CAS number: 52918-63-5, 98% purity). The CAS chemical name (α-cyano-3-phenoxybenzyl (1R,3R)-3-(2,2-dibromovinyl)-2,2 dimethyl cyclopropane carboxylate), rutin (3,3′,4′,5,7-pentahydroxyflavone-3-rhamnoglucoside, CAS number: 207671-50-9, 94% purity), and other chemicals used in the study were supplied by Sigma-Aldrich Chemical Company (St. Louis, MO, USA).
Animals
Ten-week-old male Sprague Dawley rats (average body weight 250–300 g) were obtained from the Experimental Animal Center of Ataturk University, Erzurum, Turkey. The animal room was designed to maintain temperature at 24 ± 1 °C, relative humidity at approximately 45 ± 5%, and a 12 h dark/light photoperiod. The rats were acclimatized to the experimental condition for a period of 1 week and fed with standard laboratory feed and tap water ad libitum. The study was approved by the Animal Experiments Local Ethics Committee of the Atatürk University (approval no: 2020-4/65).
Experimental design
The animals were randomly subdivided into 5 different groups with 7 rats in each group and were treated as follows:
-
1)
Group I (control) received 0.5-ml corn oil per rat, which was given only once a day via oral gavage.
-
2)
Group II (rutin) received rutin (50 mg/kg, b.w.) (Manzoni et al. 2019).
-
3)
Group III (deltamethrin) received deltamethrin (1.28 mg/kg, b.w., dissolved in corn oil) (Yousef et al. 2006).
-
4)
Group IV (deltamethrin + rutin 25 mg/kg) was treated with rutin (25 mg/kg, b.w.) 30 min after deltamethrin administration.
-
5)
Group IV (deltamethrin + rutin 50 mg/kg) was treated with rutin (50 mg/kg, b.w.) 30 min after deltamethrin administration.
In the present study, deltamethrin and rutin were given orally through stomach gavage and continued for 30 consecutive days. The selected dose of deltamethrin was based on the previous study where 1/100 of the LD50 induced biochemical and histopathological alterations in rats without leading to morbidity (Yousef et al. 2006).
At the end of the experimental period, 24 h after receiving the last treatment, the rats were sacrificed under mild sevoflurane anesthesia. Blood samples were collected and centrifuged at 3000 rpm for 10 min to separate the serum. The liver and kidney tissues were used for biochemical, molecular, and histopathological analysis.
Determination of hepatic and renal function markers
Measurement of serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) were done by enzymatic commercial kits (TML, Diagnostic Medical Products, Ankara, Turkey). Also, serum levels of urea, creatinine, and nephrin were measured by colorimetric kits (Diasis Diagnostic Systems, İstanbul, Turkey).
Determination of lipid peroxidation and antioxidant enzymes in the liver and kidney tissues
To obtain tissue homogenates, the liver and kidney tissues were ground using liquid nitrogen.
These tissues were homogenized in a homogenizer device with 1.15% potassium chloride to obtain a 1:10 (w/v) whole homogenate. The homogenates required for oxidative stress biomarkers and lipid peroxidation analyses were obtained as described in our previous study (Kandemir et al. 2020b). Superoxide dismutase (SOD) activity of the liver and kidney tissue homogenates was estimated according to the method of Sun et al. (1988), and it was expressed as units (U) per gram of protein. Catalase (CAT) activity was evaluated according to Aebi (1984), and it was expressed as katal per gram of protein. Glutathione peroxidase (GPx) activity was evaluated as U/g protein in the liver and kidney tissues according to Lawrence and Burk (1976) method. Glutathione (GSH) content was determined by the method of Sedlak and Lindsay (1968). As a marker of lipid peroxidation, the kidney and liver tissue malondialdehyde (MDA) concentrations were determined according to the method of Placer et al. (1966) and its levels were expressed as nanomole per gram of tissue. The GSH and MDA concentrations have been expressed as nanomole per gram tissue. The protein content of the liver and kidney tissue homogenates were determined using the Lowry et al. (1951).
Determination of inflammatory markers in the liver and kidney tissues
Frozen liver and kidney tissues were homogenized in ice-cold phosphate saline buffer (0.1 M; pH 7.4; 1:20 w/v) and then centrifuged at 3500 rpm for 15 min to obtain these tissue homogenates. The obtained supernatants were used in the ELISA assays. Interleukin-1 beta (IL-1β), nuclear factor kappa B (NF-κB), and tumor necrosis factor-α (TNF-α) levels and p38α mitogen-activated protein kinase (p38α MAPK), inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2) activities in liver and kidney tissues were determined using commercial rat ELISA kits according to the manufacturer’s procedure (YL Biont, Shanghai, China).
Determination of beclin-1 levels in the liver and kidney tissues
The levels of beclin-1 in the liver and kidney homogenates were determined using an ELISA kit according to the manufacturer’s instructions (YL Biont, Shanghai, China).
Real-time PCR
Total RNA was isolated from liver and kidney tissue of experimental and control groups with QIAzol Lysis Reagent (Qiagen, Cat: 79306, Germany) according to the manufacturer’s instructions. cDNA was synthesized with QuantiTect Reverse Transcription (Qiagen, Cat:330411, Germany) from total RNA according to the manufacturer’s instructions (Özdemir and Çomaklı 2018). Real-time PCR (RT-PCR) was conducted to measure the mRNA transcript level of Cas-3, Bax, Bcl-2, PARP-1, and VEGF in the liver and kidney tissues using Rotor-Gene Q 5plex HRM Platform (Qiagen, Germany). All primer sequences and reaction conditions are shown in Table 1. GAPDH was used as internal control gene. Relative folds of expressions were evaluated with the 2-ΔΔCT method (Livak and Schmittgen 2001).
Western blot analysis
Total protein was isolated from liver and kidney with radioimmunoprecipitation assay buffer (RIPA buffer) and the protein concentration was measured by Bradford assay. Total proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS/PAGE) on a 12% gel and transferred to a PDVF membrane. The membrane was incubated with primary antibodies, PARP (1:1000 dilution, Rabbit, ab227244, Abcam), VEGF (1:1000 dilution, Rabbit Polyclonal, ab46154, Abcam), and GAPDH (1:2000 dilution, Rabbit Polyclonal, ab9485, Abcam ) overnight at 4°C on a shaker. The membrane was incubated with the secondary antibodies (goat anti-rabbit IgG-HRP 1:5000 dilution, ab6721, Abcam) at room temperature (RT) for 1 h. The target protein bands were analyzed using the ChemiDoc™ MP Imaging System (Bio-Rad, CA, USA).
Histopathological processing
Liver and kidney tissues were first fixed in 10% neutral buffered formalin for 24 h and then were washed with tap water. Tissues were processed for dehydration with a series of graded ethanol (70, 80, 90, 96, 100%) and xylene series and embedded in paraffin. Five-micrometer thick were obtained with a microtome (Leica RM2255, Germany). Later, sections were deparaffinized, rehydrated, and stained with the hematoxylin-eosin solution for observation for pathological damage.
Immunohistochemistry
Immunohistochemical detection of c-fos was performed using the streptavidin-biotin peroxidase technique. Serial sections of 5-μm thickness were placed on poly-l-lysine-coated slides, deparaffinized, dehydrated, rinsed in tap water, and treated with 3 % H2O2 to quench the endogenous peroxidase activity for 10 min, then immersed in heated sodium citrate buffer (10 mM, pH 6.0) for 20 min, and then cooled for 20 min. The slides were incubated in a blocking solution to block nonspecific protein bindings for 10 min at room temperature. The slides were then incubated with the primary antibody (c-fos; Cat no: sc-166940, Santa Cruz Biotechnology) and diluted 1:100 for 1 h at room temperature. Thereafter, the sections were incubated with the appropriate biotin and then streptavidin peroxidase (UltraVision™ Large Volume Detection System, Thermo Scientific/Lab Vision, TP-125-HL) at room temperature, for 15 min each. The primary-secondary antibody complex was visualized using 3,3′diaminobenzidine (DAB) chromogen, and then tissues were counterstained with Mayer’s hematoxylin, dehydrated, cleared, and mounted with coverslips. The immunohistochemistry results were evaluated semiquantitatively as follows: none = −; mild = +; moderate = ++; intense = +++.
Statistical analysis
IBM SPSS 20 was used to perform statistical analyses. One-way analysis of variance (ANOVA) was used to detect statistically differences of Cas-3, Bax, Bcl-2, PARP-1, and VEGF expressions at mRNA level between control and treatment groups. RT-PCR results are expressed as mean ± SEM. Statistically differences were considered to be significant at p < 0.05, p < 0.01, and p < 0.001.
The immunohistochemistry data were analyzed using SPSS software and compared by one-way analysis of variance followed by Tukey’s test. Data are means ± standard errors of the mean (SEM). p < 0.05 was regarded as statistically significant.
Results
Rutin prevents deltamethrin-induced liver injury
Oral administration of deltamethrin caused a significant elevation (p<0.05) of serum ALT, AST, and ALP activities compared to the control group. Concurrent administration of rutin (25 and 50 mg/kg) significantly alleviated (p<0.05) serum AST, ALP, and ALT activities in deltamethrin-induced rats (Table 2).
Rutin protects deltamethrin-induced kidney injury
The effects of rutin treatment on the deltamethrin-induced kidney toxicity on serum urea, creatinine, and nephrin levels are shown in Table 3. Treatment with deltamethrin resulted in a highly significant increase in serum urea and creatinine levels (p<0.05) and a significant decrease in serum nephrin level (p<0.05) as compared to the control groups, while co-treatment of rutin caused a significant decline in the levels of serum urea and creatinine and a significant increase in the level of nephrin.
Effect of rutin and deltamethrin on liver and kidney oxidative stress markers
To research the roles of antioxidant enzymes in mediating the radical-scavenging activity of rutin, the lipid peroxidation and intracellular antioxidant enzyme activities were measured in the deltamethrin-induced hepatotoxicity and nephrotoxicity. It was observed that the MDA levels in liver and kidney tissues of rats treated with deltamethrin alone caused a significant increase (p<0.05) compared to the control group. This increase was attenuated by the treatment with rutin. Additionally, significantly reduced activities of the enzymatic (SOD, CAT, and GPx) and nonenzymatic (GSH) antioxidant molecules were seen in the liver and kidney tissues of deltamethrin-treated rats compared with the control group. Co-administration of rutin (25 and 50 mg/kg) with deltamethrin significantly increased the abovementioned parameters in a dose-dependent manner compared to the deltamethrin group alone. The results are listed in Tables 2 and 3.
Effect of rutin and deltamethrin on liver and kidney inflammatory markers
To explore the effects of rutin treatment on the inflammatory response with deltamethrin administration, we determined liver and kidney NF-κB, TNF-α, IL-1β, iNOS, and COX-2 levels. Deltamethrin-induced groups showed a significant increase (p<0.05) in liver and kidney NF-κB, TNF-α, and IL-1β levels when compared with the control groups as depicted in Fig. 1A–C. However, concurrent administration of rutin led to a significant decrease (p<0.05) in these levels in deltamethrin-induced groups.
Activities of iNOS and COX-2 showed a significant (p<0.05) increase in the liver and kidney tissues of deltamethrin-induced rats when compared to the control group (Fig. 2A and 2B). The combination of deltamethrin and rutin downregulated (p<0.05) the high levels of these enzymes compared to the deltamethrin-induced group.
Effect of rutin and deltamethrin on liver and kidney p38α MAPK and beclin-1 levels
The levels of p38α MAPK and beclin-1 in liver and kidney tissues were studied by rat ELISA kits. The results showed that the levels of p38α MAPK and beclin-1 in these tissues increased significantly after deltamethrin treatment compared to the control group while both doses of rutin significantly (p<0.05) decreased p38α MAPK and beclin-1 levels compared to deltamethrin group (Fig. 2C and 2D).
Rutin decreased the apoptosis activity induced by deltamethrin
While Cas-3 and Bax mRNA transcript level was upregulated in the deltamethrin group compared to control (p < 0.01), these genes expression was downregulated in the deltamethrin+rutin-25 and deltamethrin+rutin-50 groups compared to the deltamethrin group (p < 0.05). Furthermore, Bcl-2 mRNA transcript level was downregulated in the deltamethrin group compared to control (p < 0.01). However, Bcl-2 gene expression was upregulated in the deltamethrin+rutin-25 and deltamethrin+rutin-50 groups compared to the deltamethrin group (p < 0.05) (Fig. 3A-3C). These results indicated that while deltamethrin treatment induced the apoptosis in the liver and kidney tissues, rutin decreased the apoptosis.
Rutin reduced the expressions of PARP-1 and VEGF induced by deltamethrin
Poly[ADP-ribose]polymerase 1 and VEGF gene expression levels were only upregulated in the deltamethrin group compared to the control group (p < 0.01). In the rutin group, the mRNA transcript levels of PARP-1 and VEGF were similar as the control group for both liver and kidney tissue (p > 0.05). PARP-1 and VEGF gene expression levels were downregulated in the deltamethrin+rutin-25 and deltamethrin+rutin-50 groups compared to the deltamethrin group (p < 0.05) (Fig. 4A-4B). In addition, the Western blot results of PARP-1 and VEGF confirmed the RT-PCR results. While the protein levels of PARP-1 and VEGF were increased in the deltamethrin group, these protein levels were decreased in the deltamethrin+rutin-25 and deltamethrin+rutin-50 (p < 0.05) (Fig. 4C-4D). These results indicated that while deltamethrin treatment activated the PARP-1 and VEGF in the liver and kidney tissues of rats, rutin deactivated these gene expressions.
Effect of rutin treatment on the histopathology of deltamethrin-treated rats
Normal hepatocytes with normal sinusoids and the central vein were seen both in control rats (Fig. 5A) and only rutin-treated rats (Fig. 5B). Deltamethrin caused extremely severe hemorrhage, necrosis, and dissociation in hepatocytes around the central vein in rats as shown in Fig. 5C. In the deltamethrin+rutin-25-treated group, it showed severe congestion, moderate necrosis (Fig. 5D). Rutin-50 treatment significantly alleviated deltamethrin-induced increase in congestion and necrosis (Fig. 5E).
There were not seen any pathological findings within the corticomedullary junction in the control (Fig. 6A) and only rutin-treated groups (Fig. 6B). Histopathological findings showed severe necrosis and hemorrhage in the corticomedullary junction in the deltamethrin-treated groups (Fig. 6C). In contrast, treatment with rutin-25 demonstrated a mild reduction of the hemorrhage in the corticomedullary junction (Fig. 6D). Treatment of deltamethrin+rutin-50 also provided a more significant reduction in hemorrhage (Fig. 6E).
Effect of rutin on the expression of c-fos in deltamethrin-treated rats
Immunohistochemical staining of c-fos in rat liver showed no c-fos expression in the control (Fig. 7A) and rutin-treated groups (Fig. 7B) with a significant increase in c-fos expression in the cytoplasm of hepatocytes in the deltamethrin-treated group (Fig. 7C) and a significant decrease in c-fos expression in the groups treated with deltamethrin+rutin-50 group (Fig. 7E), while the deltamethrin+rutin-25 group showed no a significant decrease in c-fos expression (Fig. 7D; Table 4, p<0.05). Immunohistochemical staining of c-fos in rats’ kidney showed no expression in the cytoplasm of tubular epithelium in the corticomedullary junction of the control (Fig. 8A) and rutin-treated groups (Fig. 8B). A significant increase in c-fos expression was recorded in the deltamethrin-treated group (Fig. 8C) as compared to the control group and rutin-treated group. A significant decrease was recorded in c-fos expression in the deltamethrin+rutin-25- (Fig. 8D) and deltamethrin+rutin-50-treated group (Fig. 8E) and showed a significant change as compared to the control group (Table 4, p<0.05).
Discussion
In this study, hepatotoxicity and nephrotoxicity caused by deltamethrin in rats were investigated. Experimental results suggest that treatment with rutin could decrease the deltamethrin-induced liver and kidney damages via modulating oxidative stress, inflammation, and apoptosis in experimental animals.
Free radicals and ROS may play crucial roles in the induction of pyrethroid-induced damage to proteins, lipids, and DNA in both invertebrates and vertebrates. Among the pyrethroid insecticides, deltamethrin has been reported to have some toxic effects (Abdou and Abdel-Daim 2014; El Golli-Bennour et al. 2019; Maalej et al. 2017). Liver microsomal enzymes which mainly metabolize deltamethrin and toxic metabolites of deltamethrin have been documented to accumulate in the liver (Abdel-Daim et al. 2016; Abdelkhalek et al. 2015; El Golli-Bennour et al. 2019). Toxic metabolites of deltamethrin mainly accumulates in liver as it is the main site of metabolism of xenobiotics and the kidney is the main excretory organ (Abdelkhalek et al. 2015; Sayeed et al. 2003). A group of scientists have shown that deltamethrin can easily penetrate the membrane cell due to its lipophilic nature and cause lipid peroxidation (Abdel-Daim et al. 2013). Based on the previous studies, it has been emphasized that one of the main causes of hepatotoxicity and nephrotoxicity caused by deltamethrin is oxidative stress (Abdel-Daim and El-Ghoneimy 2015; Rjeibi et al. 2016). Present study demonstrated that deltamethrin administration was associated with a significant increase in MDA level (as a marker of lipid peroxidation) as well as by a decrease in the activity of SOD, CAT, GPx, and GSH in both tissues (Tables 2 and 3). Rutin acts as a scavenger of ROS by donating hydrogen atoms to superoxide anions, hydroxyl radicals, and peroxyl radicals (Çelik et al. 2020). Therefore, rutin is thought to reduce the toxic effects of deltamethrin by scavenging ROS. In the present study, rutin treatment (25 and 50 mg/kg) reduced deltamethrin-induced liver and kidney damages by increasing antioxidant enzyme activities that had been reduced by deltamethrin. It has been determined that a dose of 50 mg/kg rutin used in combination with deltamethrin is more effective. In a similar study, it was found that rutin ameliorated reduced antioxidant enzyme activities in carbon tetrachloride-induced hepatotoxicity and nephrotoxicity in rats (Elsawy et al. 2019).
Liver biomarker enzymes such as ALP, ALT, and AST are used as markers of liver damage, while urea, creatinine, and nephrine are considered markers of kidney function, and in some recent studies, a notable elevation of levels of these biomarkers was observed after deltamethrin intoxication (Abdel-Daim et al. 2014; Abdel-Daim and El-Ghoneimy 2015; Maalej et al. 2017). The histopathologic observation of liver tissue in deltamethrin-treated rats showed severe hemorrhage, necrosis, and dissociation in hepatocytes around the central vein. Also, severe necrosis and hemorrhage in the corticomedullary junction have been observed in the deltamethrin-treated rat kidney tissues. In the present study, co-treatment with rutin significantly ameliorated deltamethrin-induced liver and kidney injuries and decreased elevations of abovementioned serum biomarker levels. These results revealed the antioxidant effect of rutin, which plays an important role in reducing toxicity and maintaining liver and kidney membrane integrity in deltamethrin-treated rats.
Reactive oxygen species can activate several transcription factors, which causes to the differential expression of some genes participated in inflammatory pathways (Hussain et al. 2016). Under different pathological conditions, the classical NF-κB inflammatory signaling pathway is activated by ROS. Following that, many pro-inflammatory cytokines such as TNF-α, IL-1β, IL-6, COX-2, and iNOS are released and this further exacerbates the inflammatory injury to the liver and kidney (Kandemir et al. 2019; Li et al. 2021; Temel et al. 2020). Arora et al. (2016) showed that DLM exposure increased the expression of inflammatory markers such as NFκB, TNFα, COX-2, and iNOS in primary hepatocytes of rats. However, the mechanism by which DLM induces inflammation remains unclear. In our study, we showed that rutin plays an important role in alleviating ROS-generated and NFκB-induced inflammation through reduction of TNF-α, IL-1β, p38α-MAPK, COX-2, and iNOS in the liver and kidney damages caused by deltamethrin. In our previous studies, we reported that different doses of rutin administered against mercury chloride toxicity decreased liver and kidney inflammation by reducing the levels of inflammation-related parameters (Caglayan et al. 2019a; Caglayan et al. 2019b).
Apoptosis is a normal cellular death process triggered by some factors that include toxins (Ahmadvand et al. 2016). Previously, in vivo and in vitro studies demonstrated that exposure to deltamethrin significantly affected cell survival and induced apoptosis in hepatocytes (Das et al. 2007), kidneys (Maalej et al. 2017), splenocytes (Kumar and Sharma 2015), neuronal cells (Wu et al. 2000), and PC12 cells (Park et al. 2017). Recent evidence has shown that deltamethrin exposure may induce caspase-independent/caspase-dependent death in a variety of cells/tissues (Arora et al. 2016; Kumar et al. 2016; Kumar and Sharma 2015; Park et al. 2017). It has also been reported that deltamethrin can induce cell damage through activation of multiple pathways, including but not restricted to caspase activation, ER stress signaling, eNOS/JNK/AR pathways, calpain-mediated cell death, altered intracellular calcium level, or autophagy modulation. (Hossain and Richardson 2011; Kumar et al. 2016; Magby and Richardson 2015; Park et al. 2017; Yu et al. 2014). Maalej et al. (2017) have manifested that deltamethrin induced apoptosis by increasing expression of p53 as well as decreasing bcl-2 in rat liver and kidney tissues. In the current study, we observed increased mRNA expression of apoptotic markers Bax and caspase-3, while Bcl-2 expression was decreased in deltamethrin-induced rat liver and kidney tissues. Conversely, co-treatment of rutin was significantly effective in reversing apoptosis in these tissues. In particular, it was determined that 50 mg/kg rutin dose was more effective in reducing apoptosis. Currently, the precise mechanisms by which rutin modulates genes associated with apoptosis are not clear. However, we believe that the anti-apoptotic effect of rutin is related to the upregulation of the Bcl-2/Bax ratio, because many antioxidants, including rutin, affect genes related to apoptosis in cells under oxidative stress, or activation of extracellular signal-related protein kinases (ERK1/2) or phosphoinositide-3-kinase (PI3K) may be responsible for the change of expression of genes related to the Bcl-2 family. Indeed, activation of PI3K and Akt has been shown to promote cell survival and suppress apoptosis (Jeong et al. 2009).
Vascular endothelial growth factor is an endothelial cell mitogen that is mainly synthesized due to tissue ischemia, hypoxia, and endothelial cell damage (Atakan et al. 2008). It plays a role in wound healing, vascular permeabilization, inflammation, embryogenesis, and tissue remodeling (Shihab et al. 2003; Yang et al. 2018). It has been documented that VEGF plays an important role in angiogenesis, nephrogenesis, and hepatic regeneration (Ferrara 1999; Papastefanou et al. 2007). PARP-1 is a nuclear protein involved in the routine repair of DNA damage by adding poly(ADP-ribose) polymers in response to various cellular stresses (Chaitanya et al. 2010). During oxidative stress, PARP-1 acts as a DNA break resulting in transient ribosylation using endogenous NAD+ as the ribose monomer substrate donor (Coyle et al. 2015). In addition, increased activation of PARP-1 can lead to cell death and organ damage as a result of depletion of cellular reducing equivalents (e.g., NADH) and cellular energy crisis (Hegedűs and Virág 2014). It has been reported that DNA damage associated with oxidative stress can induce PARP-1 activation (Hegedűs and Virág 2014; Virag 2005). RT-PCR and immunoblotting results in this study confirmed that deltamethrin toxicity caused an increase in PARP-1 and VEGF expression in liver and kidney tissues, while rutin treatment significantly decreased the expression of these parameters compared to only deltamethrin group.
C-fos is an important member of activator-protein 1 (AP-1) participated in cellular processes some of which include cell proliferation, differentiation, and apoptotic cell death (Kadry et al. 2018; Stanisavljević et al. 2019). C-fos also was shown to function as a suppressor protein in inflammatory responses. It directly interacts directly p65 subunit of NF-κB, consequently inhibiting the pathway downstream of NF-κB and triggering of pro-inflammatory cytokines such as TNF-α (Ray et al. 2006). In the present study, we found a remarkable increase in the expression of c-fos in the liver and kidney tissues of rats in the deltamethrin-induced group, and co-treatment with rutin reduced its overexpression.
There is no clinical antidote for deltamethrin poisoning and symptomatic treatment is the only option. Medicinal plants have traditionally been used for centuries to strengthen the immune system and prevent disease (Kumar et al. 2015). In this study, we report the protective role of rutin against deltamethrin-induced hepatorenal toxicity. Therefore, the role of plants in attenuating the different organ toxicities induced by deltamethrin should be investigated in the future.
Conclusions
The present study confirmed that the exposure to deltamethrin was potentially hepatorenal toxic and the obtained data showed that oxidative stress, inflammation, and apoptosis were involved in hepatotoxicity and nephrotoxicity in male rats intoxicated with deltamethrin for 30 days. However, treatment with rutin significantly ameliorated all biochemical, molecular, and histological changes, induced by deltamethrin. All data obtained from the study reveal the protective effects of rutin supplementation against deltamethrin-induced liver and kidney damage.
Abbreviations
- ALP:
-
Alkaline phosphatase
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- Bax:
-
Bcl-2-associated x protein
- Bcl-2:
-
B-cell lymphoma-2
- Caspase-3:
-
Cysteine aspartate specific protease-3
- CAT:
-
Catalase
- COX-2:
-
Cyclooxygenase-2
- ELISA:
-
Enzyme-linked immunosorbent assay
- GPx:
-
Glutathione peroxidase
- GSH:
-
Glutathione
- IL-1β:
-
Interleukin-1β
- IL-6:
-
Interleukin-6
- iNOS:
-
Inducible nitric oxide synthase
- MDA:
-
Malondialdehyde
- NF-κB:
-
Nuclear factor kappa B
- PARP-1:
-
Poly[ADP-ribose]polymerase 1
- p38α MAPK:
-
p38α mitogen-activated protein kinase
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- TNF-α:
-
Tumor necrosis factor-α
- VEGF:
-
Vascular endothelial growth factor
References
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SK: investigation, methodology. FMK: investigation, data curation, review and editing, supervision, SÖ: methodology, software, formal analysis. SÇ: methodology, formal analysis. CC: investigation, writing (review and editing), supervision.
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Küçükler, S., Kandemir, F.M., Özdemir, S. et al. Protective effects of rutin against deltamethrin-induced hepatotoxicity and nephrotoxicity in rats via regulation of oxidative stress, inflammation, and apoptosis. Environ Sci Pollut Res 28, 62975–62990 (2021). https://doi.org/10.1007/s11356-021-15190-w
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DOI: https://doi.org/10.1007/s11356-021-15190-w