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Immunobiochemical modulations caused by clomazone in Swiss albino mice
The Journal of Basic and Applied Zoology volume 78, Article number: 4 (2017)
Recently, we reported immunological and hematological perturbations in Swiss albino mice exposed to clomazone (CMZ) (Nassef, The Egyptian Journal of Experimental Biology (Zoology) 13(1):91–101, 2017).
To continue searching immunological perturbations of CMZ, the main goal of the current study was to investigate the probable immunobiochemical perturbations caused by CMZ and to evaluate the alleviating role of vitamin C.
To asses this goal, mice were intraperitoneally (i.p.) injected with vitamin C (1136 μM/kg), CMZ (46 μM/kg), or CMZ plus vitamin C with the same dose of each, daily for 4 weeks. Changes in relative weights of immune-related organs (spleen and thymus), renal functions (urea and creatinine), liver functions [alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), lactate dehydrogenase (LDH) and total protein], and immunoglobulin (Ig) isotype (IgA, IgG, and IgM) concentrations in addition to the proliferative capacity of CMZ-exposed murine lymphocytes were investigated.
Results showed that CMZ injection caused a significant decrease in body weight gain along with significant decrease in the relative weights of the spleen and thymus. Values of ALT, AST, and ALP were significantly elevated, while total protein and LDH were significantly decreased in CMZ-exposed mice. CMZ injection led to significant increases in the levels of serum urea and creatinine. Moreover, the levels of serum IgA, IgG, and IgM in CMZ-treated mice were significantly lower than those in PBS-treated mice. Reduced lymphocyte proliferation capacity was observed in CMZ-treated mice. Interestingly, pre-treatment of vitamin C to CMZ-exposed mice mildly alleviated CMZ-induced immunobiochemical perturbations. Therefore, vitamin C mildly alleviated CMZ-induced immunobiochemical impacts, but it was not completely protective.
Further studies are needed to assess the relationships between antioxidants and CMZ-induced immunobiochemical perturbations.
The immune system is regularly affected by chemical periodic stresses. Adverse environmental situations may chronically stress the animal’s health, altering some of their immunobiochemical parameters and suppressing their immune and physiological responses (Miller et al., 2002). Pesticides are the major immunomodulators. Exposure to sublethal concentrations of pesticides is suspected of predisposing non-target species to diseases because of their immunobiochemical depressive effects (Dunier & Siwicki, 1993; Richard, Peden, & Williams, 1994).
One of the worldwide herbicides is clomazone (CMZ) that is employed for weed control. Comparatively, few data are available on its perturbations to non-target species (Jonsson, Maia, Ferreira, & Ribeiro, 1998). In our previous work (Nassef, 2017), immunological and hematological perturbations in Swiss albino mice exposed to CMZ at concentration of 46 μM/kg had been reported. Exposure of organisms to contaminants such as CMZ can cause biological changes that can be used as indicators of environmental chemicals risks. Among biological changes, immunobiochemical parameters are considered potential biomarkers of chemical exposure (Van der Oost, Beyer, & Vermeulen, 2003). The effects of pesticides have been observed in the changes of body weight gain, relative weight of immune-related organs (spleen and thymus), renal and liver functions, and contents of immunoglobulin (Ig) isotypes (IgA, IgE, and IgM).
Studies on non-target species showed reduction in final body weight by treatment with herbicide 2,4-D dimethylamine salt (DMA) (Salbego et al., 2010; Menezes et al., 2015) that may be due to changes in their metabolic pathways due to herbicide stress (Fonseca et al., 2008). Decreases in the absolute and relative weights of the spleen and thymus were observed in mice treated with atrazine (Filipov, Pinchuk, Boyd, & Crittenden, 2005; Karrow et al., 2005; Zhang et al., 2011) that may be associated with the inhibition of lymphocyte proliferation and/or the increase of their death (Kamath, Xu, Nagarkatti, & Nagarkatti, 1997; Vandebriel, Spiekstra, Hudspith, Meredith, & Van Loveren, 1999).
Changes in urea and creatinine concentrations were used as markers of renal function due to chemical stress (Donadio, Lucchesi, Tramonti, & Bianchi, 1997). Pesticides such as glyphosate and cypermethrin induced nephrotoxicity in mice which was evidenced by the rise in serum urea and creatinine levels that may be attributed to renal cell damage due to accumulation of these chemicals in the renal nephrons (Manzoor, Mehboob, & Naveed, 2016).
Increases in the contents of liver enzymes such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) may be a sensible indicator of cellular liver damage caused by pesticide exposure (Gholami-Seyedkolaei, Mirvaghefi, Farahmand, & Kosari, 2013). Sharma, Bashir, Rshad, Gupta, and Dogra (2005) reported a significant increase in AST, ALT, and ALP activities in pesticide-treated rats that may be due to increase in the secretory activities of the hepatocyte cells resulted from the disturbance in their transport function and membrane permeability as a result of pesticide-induced hepatic injury that causes the leakage of AST, ALT, and ALP from hepatocytes into the blood (Abdulaziz & Hristev, 1996; Fan et al., 2009; Murussi et al., 2016; Yousef, Abbassi, & Yacout, 1999).
Lactate dehydrogenase (LDH) is a cytoplasmic enzyme that is used clinically to diagnose cell injury; as such, it is a useful marker for toxic chemical exposure. Injection of mice with the pesticide diazinon resulted in reduction in the LDH level (Shokrzadeh et al., 2012) that may be resulted from failure in the antioxidant defense system to protect against free radicals and tissue oxidative damage (Salehi & Jafary, 2010). Changes in total protein content can be considered as a diagnostic tool for physiological disorders due to chemical poisoning (Canli, 1996; Jacobs, Carmichael, & Cavanagh, 1977) that might be due to a breakdown of protein into free amino acid (Sakr, Mahran, & Abo-Elyazid, 2005) or destruction of cellular function and consequent impairment in protein synthetic machinery (David, Mushigeri, Shivakumar, & Philip, 2004; Gokcimen et al., 2007).
The Ig isotypes (IgA, IgG, and IgM) play a crucial role in the immune system’s defense mechanisms in response to exposure to a foreign invader such as toxins and toxic agents (Von König, Finger, & H’Ormaycht, 1979). Pesticide administration may have a suppression effect on the secretion mechanism or specific response activity of Ig isotypes that was accompanied with the atrophy of immune-related organs (spleen and thymus) (Insel, Amstey, Woodin, & Pichichero, 1994; Nimmerjahn & Ravetch, 2008).
Antioxidant properties of vitamin C could enhance immunity against pesticide effects by preserving the functional and structural integrity of important immune cells (Chew, 1995) and attenuate the pesticide-induced imunobiochemical perturbations by inactivating damaging free radicals produced through normal cellular activity and from various chemical stresses (Kalender, Uzunhisarcikli, Ogutcu, Acikgoz, & Kalender, 2006; Jurczuk, Brzóska, & Moniuszko-Jakoniuk, 2007; Uzunhisarcikli et al., 2007; Verma, Mehta, & Srivastava, 2007; Ogutcu, Suludere, & Kalender, 2008).
To complete searching the possible immunological perturbations of CMZ which we reported in our recent publication (Nassef, 2017), the objectives of this work were to investigate the probable immunobiochemical perturbations induced by herbicide CMZ and to evaluate the alleviating role of vitamin C against these perturbations in male Swiss albino mice.
Male Swiss albino mice (weighting 25–34 g), purchased from the National Research Centre, Cairo, Egypt, were kept in a specific pathogen-free and well-ventilated animal facility in accordance with the standard guide for the care and use of laboratory animals. The mice were quarantined for 1 week (12-h light/dark cycle, 22 ± 2 °C, 60–65% relative humidity) before experimentation. The mice were given pellet food and water ad libitum.
Chemicals and reagents
Clomazone (CMZ; FMC Corporation, Philadelphia, USA) and L-ascorbic acid (vitamin C; Carlo Erba, Milano, Italy) were dissolved in phosphate-buffered saline (PBS) at desired experimental doses.
The mice were exposed to PBS, CMZ [46 μM/kg; 1/20 of the 96-h LD50 for an intraperitoneal (i.p.) dose; Nassef, 2017], and/or vitamin C (1136 μM/kg; Uzun, Kalender, Durak, Demir, & Kalender, 2009). The mice were divided into four groups of ten animals each. Group 1 i.p. administrated PBS as a control group, Group 2 i.p. inoculated with vitamin C (1136 μM/kg), Group 3 i.p. injected with CMZ (46 μM/kg), and Group 4 i.p. injected with vitamin C (1136 μM/kg) 30 min prior to i.p. administration of CMZ (46 μM/kg), daily 4 weeks. By the end of the treatment, five mice from each group were euthanized by cervical dislocation at fasting state. Prior to the scarifying, final body weights of the mice were recorded and blood samples were collected for immunobiochemical analyses. The thymus and spleen were aseptically removed and weighted.
Body weight gain and immune-related organs’ relative weight
Final body weight of the mice in all experimental groups was recorded. The spleen and thymus were removed aseptically and weighted, and their relative body weights (ROW) were calculated according to Aniagu et al. (2005) using the following formula: ROW = [absolute organ weight (g)/body weight of mice on sacrifice day (g)] × 100. Percentage weight gains of mice (WG%) were calculated according to Tukmechi, Rezaee, Nejati, and Sheikhzadeh (2014) using the following formula: WG% = (final body weight − initial body weight) × 100/initial body weight).
Preparation of sera samples
Five mice from each group were euthanized by cervical dislocation at fasting state. Blood samples were collected from the retro-orbital plexus in plastic test tubes and allowed to stand for 3 h to ensure complete clotting. The clotted blood samples were centrifuged at 3000 rpm for 10 min, and the clear sera samples were aspirated off and stored frozen at −80 °C for immunobiochemical analyses.
The following parameters were determined calorimetrically by employing the standard ready-to-use kits and methods of Human (Human Gesellschaft für Biochemica and Diagnostica MBH, Germany) using a fully automated biochemistry analyzer (Vitalab Selectra E, Germany): AST (U/l), ALT (U/l), ALP (U/l), total protein (g/dl), creatinine (mg/dl), and urea (mg/dl). LDH was measured using kits supplied by Diamond Diagnostics according to the method of Cobaud and Warblewski (1958). The manufacturer’s instructions for each biochemical parameter were strictly followed in the course of the investigations.
Enzyme-linked immunosorbent assay for serum immunoglobulin isotypes
Serum levels of IgA, IgG, and IgM in exposed mice were evaluated by using enzyme-linked immunosorbent assay (ELISA) as described by Arce, Nawar, Muehlinghaus, Russell, and Connell (2007) and Keggan, Freer, Rollins, and Wagner (2013). Briefly, microtiter plates (Nunc, Roskilde, Denmark) were coated with 4 μg/ml of goat anti-mouse Ig isotype-specific antibodies (Southern Biotechnology, Birmingham, AL) in carbonate coating buffer (1 M NaHCO3, 1 M Na2CO3, pH 9.6) and incubated overnight at 4 °C. Plates were washed four times with PBS, 0.05% TWEEN (PBST, Sigma-Aldrich, St. Louis, MO) and then incubated with different dilutions of sera obtained from mice of control groups or from mice i.p. injected with vitamin C, CMZ, or CMZ plus vitamin C, and the plates were incubated overnight at 4 °C. The plates were again washed with PBST and incubated at room temperature for 4 h with the appropriate alkaline phosphatase-conjugated goat anti-mouse Ig isotype-specific antibodies (Southern Biotechnology) diluted 1:10,000. The plates were washed with PBST and incubated 15 min in the dark with substrate buffer (33.3 mmol citric acid, 66.7 mmol NaH2PO4, pH 5.0), combined with 130 μg/ml 3,3′,5,5′-tetramethylbenzidine (Sigma-Aldrich) and 0.012% hydrogen peroxide. Color reactions were terminated by adding 100 μl of 2.0 M NaOH to each well. The optical density of the color reaction mixture was assessed using an automatic on a multiwall scanning spectrophotometer (Biotek, Winooski, VT) at 450-nm absorbance. Concentrations of Ig isotypes (μg/ml) were calculated by the interpolation of calibration curves generated by using a mouse Ig reference serum (ICN Biomedicals, Aurora, OH).
In vitro lymphocyte proliferation assay
Lymphocyte preparation and treatment: Peripheral blood mononuclear cells (PBMC) were separated from the blood sample of Swiss albino mice according to Goyarts, Dänicke, Tiemann, and Rothkötter (2006). Briefly, 3 ml of heparinized blood were layered over a Ficoll-Histopaque 1077 (Sigma, Mumbai, India) and centrifuged (500×g, 20 min, 4 °C). The buffy cellular layer at the interface was collected and washed three times (centrifugation 300×g, 10 min, 4 °C) in RPMI-1640 medium (Gibco/BRL, USA), then cells were resuspended in complete RPMI-1640 medium and counted. Viable cells were counted using trypan blue dye exclusion technique. Cells (1 × 105 cells/well) were cultured in a 96-well flat-bottomed tissue culture plate. For lymphoproliferation stimulation, triplicate wells were treated with 5 μg/ml mitogen phytohemagglutinin (PHA, Sigma-Aldrich) then incubated (37 °C, 5% CO2) for 24 h (Wichmann, Herbarth, & Lehmann, 2002). After incubation, test compounds were added to each well: vitamin C (113.6 μM/well; Uzun et al., 2009), CMZ (4.6 μM/well; 1/200 of the 96-h LD50 for an i.p.; Nassef, 2017), or a combination of CMZ and vitamin C with the same dose of each, then the plate was incubated for 48 h under the same incubation conditions.
MTT assay: After 48-h incubation, lymphocyte proliferation was determined by MTT (3-(4,5-dimethyl-2-thiazolyl)2,5-diphenyl-2H-tetrazolium)-based assay (Mosmann, 1983): 2 mg/mL of MTT were added to each well and incubated at 28 °C for 24 h. The MTT-formazan crystals, which are formed only by live cells, were dissolved in 100 μl dimethyl sulfoxide (DMSO), enabling the optical density of each well to be measured using an ELISA reader at a transmitting wavelength of 570 nm. Stimulation index (SI) was investigated using the following formula:
The results were expressed as mean ± SE. Statistical analysis was done using Student’s t test. A difference of P ≤ 0.05 was considered statistically significant.
Generally, present data revealed significant immunobiochemical changes induced by the inoculation of CMZ, vitamin C, and their combination in male Swiss albino mice. Interestingly, vitamin C pre-treatment to CMZ-treated mice mildly alleviates some of these changes.
The impacts of CMZ, vitamin C, and their combination on body weight gain are indicated in Table 1. The obtained data revealed a significant decrease in body weight gain in vitamin C-, CMZ- and CMZ plus vitamin C-treated mice as compared to PBS-treated mice. Comparing to its values in vitamin C-treated mice, the results revealed a significant change in body weight gain in CMZ- and CMZ plus vitamin C-treated mice. There were no statistically significant changes in the weight gain in CMZ plus vitamin C-treated mice, when compared to the CMZ-treated group (Table 1).
The effects of CMZ, vitamin C, and their combination on relative weights of immune-relative organs (spleen and thymus) are illustrated in Table 2. Results showed that CMZ and CMZ plus vitamin C treatments resulted in significant decrease in the spleen and thymus relative weights, while vitamin C treatment resulted in significant increase in the spleen and thymus relative weights comparing to PBS-treated mice, while co-treatment of vitamin C prior to CMZ injection by 30 min significantly elevated this decrease as compared to the CMZ-treated group. Vitamin C-treated group showed no significant effects in relative weights of either spleen or thymus when compared to PBS-treated mice. Comparing to vitamin C-treated mice, CMZ-inoculated mice showed significant decreases in relative weights of the spleen and thymus. Similarly, thymus relative weights were significantly decreased in CMZ plus vitamin C-treated mice when compared with the vitamin C-treated mice (Table 2).
In terms of serum biochemical analysis as shown in Table 3, CMZ- and CMZ plus vitamin C-treated mice had significantly higher values for ALT, AST, and ALP than in the PBS-treated group. Similarly, ALT, AST, and ALP values were significantly increased in CMZ-treated mice when compared with the vitamin C-treated mice. Pre-treatment of vitamin C to CMZ-treated mice resulted in significant depletion of the higher values of ALT, AST, and ALP (Table 3). There were no significant changes in the values of ALT, AST, or ALP in vitamin C-treated mice compared to PBS-treated mice.
Vitamin C-inoculated mice did not differ significantly from the PBS-treated mice in terms of urea or creatinine values (Table 4). Urea and creatinine showed significant elevations in CMZ- and CMZ plus vitamin C-treated mice comparing to PBS- or vitamin C-treated mice, while administration of CMZ plus vitamin C significantly reduced this elevation of urea and creatinine values compared to the CMZ-treated group. Similarly, compared to their values in the vitamin C-treated group, there were significant elevations in urea concentrations (CMZ-treated mice) and creatinine concentrations (CMZ- and CMZ plus vitamin C-treated mice) (Table 4).
The Ig isotype production activity of CMZ, vitamin C, and their combination in exposed Swiss albino mice is shown in Table 5. Data revealed that CMZ injection caused significant decrease in the concentration of IgA, IgG, and IgM, while administration of CMZ plus vitamin C revealed significant decrease in the content of IgA and IgM when compared to the PBS-treated group. Comparing to vitamin C-treated mice, CMZ- and CMZ plus vitamin C-treated mice recorded significant depletion in the level of IgA, IgG, or IgM. The vitamin C-treated group did not differ significantly from the control group in terms of IgA, but recorded significant elevation in terms of IgA or IgM. Pre-treatment of vitamin C to CMZ-treated mice resulted in significant elevation of IgA and IgM concentrations (Table 5).
The effect of CMZ, vitamin C, or their combinations on mitogen-induced lymphoproliferation was evaluated in lymphocytes using MTT assay (Table 6). Current data indicated that the lymphocytes from mice exposed to CMZ alone showed a significant reduction in proliferation index (SI), while pre-treatment of vitamin C to CMZ-treated mice revealed non-significant reduction in SI compared with the PBS-treated group. Contrarily, vitamin C alone treatment resulted in non-significant increase in lymphocyte SI compared to PBS-treated mice (Table 6).
The impacts of CMZ, vitamin C, and their combination on the serum level of total protein and LDH in Swiss albino mice are indicated in Tables 7 and 8, respectively. Data revealed that CMZ and CMZ plus vitamin C treatments caused a significant decrease in the concentration of total protein (Table 7) and LDH (Table 8) when compared to the PBS-treated group. Pre-treatment of vitamin C to CMZ-treated mice significantly modulated the depletion in total protein value (Table 7).
Immunobiochemical change is considered one of the good indicators for toxicity evaluation of herbicides to estimate the potential the animals’ health (Brodkin, Madhoun, Rameswaran, & Vatnick, 2007; Salbego et al., 2010). The impacts of pesticides had been revealed in the immunobiochemical perturbations such as changes in body weight gain, atrophy and relative weights of immune-related organs, renal and liver functions, and concentrations of Ig isotypes (Fournier, Friborg, Girard, Mansour, & Krzystyniak, 1992; Filipov et al., 2005; Brodkin et al., 2007).
In the present study, a significant decrease in body weight gain was monitored in the mice group injected with CMZ alone or CMZ plus vitamin C. Similar responses were observed by Menezes et al. (2015) who monitored a reduction in the final weight and specific growth rate of silver catfish exposed to the herbicide 2,4-D dimethylamine salt (DMA) that may be due to CMZ long-term exposure that affects the growth of the exposed animal by altering its metabolism efficacy resulting in the overall increased degeneration of lipids and proteins (Fonseca et al., 2008; Menezes et al., 2015; Dahdouh, Attalah, Djabar, & Kechrid, 2016).
Current results revealed a significant decrease in the mean of mice spleen and thymus relative weights by exposure to CMZ. Similar results were speculated by Zhang et al. (2011) in mice exposed to pesticide atrazine (200 and 400 mg/kg) suggesting possible chemical-induced apoptotic mechanism of splenic and thymic atrophy (Prater, Gogal, Blaylock, Longstreth, & Holladay, 2002) that may be associated with the inhibition of lymphocyte proliferation and/or the increase of lymphocyte death in the spleen and thymus in response to herbicide stress (Kamath et al., 1997; Vandebriel et al., 1999).
A significant increase in ALT, AST, and ALP levels was recorded in the sera of mice treated with CMZ alone. This result was confirmed by the report of Sharma et al. (2005) who revealed a significant increase in AST, ALT, and ALP activities in pesticide-treated rats that may be due to increase in the secretory activities of the hepatocyte cells (Abdulaziz & Hristev, 1996; Yousef et al., 1999). The disturbance in the transport function and membrane permeability of the hepatocytes as a result of pesticide-induced hepatic injury results in the leakage of AST, ALT, and ALP from cells into the blood (Fan et al., 2009; Murussi et al., 2016).
Proteins are involved in major physiological events, so its content evolution can be considered as a diagnostic tool for immunobiochemical disorders due to chemical poisoning (Canli, 1996; Jacobs et al., 1977). The present results showed a significant decrease in mice serum total protein and LDH in response to CMZ toxicity. In agreement with the present data, Canli (1996) and Reddy and Bhagyalakshmi (1994) report a decrease in total protein content in fish during mercury exposure. Pesticide-induced tissue destruction and hepatocyte apoptosis might be the most important agent responsible of reducing the synthesis of total protein in the liver (Gokcimen et al., 2007). Similar to our results, a significant decrease in mice LDH in response to pesticide diazinon toxicity was reported by Shokrzadeh et al. (2012) that may be related to a failure in the antioxidant defense system to protect against free radicals and tissue oxidative damage (Salehi & Jafary, 2010).
There were significant down-regulated activities of IgA, IgG, and IgM in response to CMZ treatment. Review about the impacts of pesticide exposure on the level of Ig isotypes is very rare and argumentative. Ig isotypes play a role in the immune system’s defense in response to exposure to a foreign invader such as toxins and toxic agents (Von König et al., 1979). Pesticide administration may have a suppression effect on the secretion mechanism or specific response activity of Ig isotypes that was accompanied with atrophy of immune-related organs (Insel et al., 1994; Nimmerjahn & Ravetch, 2008).
Investigations of serum urea and creatinine level were used as markers of renal function due to chemical stress (Donadio et al., 1997). The current study revealed an increase in the level of urea and creatinine due to CMZ stress. Our study draws a parallel with the research work of Manzoor, Mehboob, and Naveed (2016) who observed that pesticides such as glyphosate and cypermethrin induced nephrotoxicity in mice which was evidenced by a rise in serum urea and creatinine levels that may be attributed to renal cell damage due to accumulation of these pesticides in the renal nephrons.
The ex vivo cell proliferative response is estimated by the stimulation index (SI) and is one of the most acceptable protocols for investigation of the immunocompetence of chemical-treated lymphocytes after mitogenic stimulation (Blohm, Siegl, & KÖllner, 2003). Thus, a reduction in the value of SI may be an indication of a decrease of the immunocompetence of the organism. Reduced cellular proliferation was observed in Balb/C mice lymphocytes (Sakazaki, Ueno, Uematani, Utsumi, & Nakamuro, 2001). The inhibitory effect of pesticide on cell proliferation is likely to reflect the ability of these chemicals to inhibit protein synthesis through binding to ribosomal peptidyl transferase (Corrier, 1991; Shifrin & Anderson, 1999).
The results obtained herein revealed that vitamin C co-administration partially diminished the immunobiochemical perturbations resulted from CMZ treatment. Vitamin C is known to be an antioxidant that can attenuate the pesticide-induced physiological and biochemical perturbations due to the scavenging of free radicals produced through normal cellular activity and from various chemical stresses (Kalender et al., 2006; Jurczuk et al., 2007). It has been suggested that the antioxidant property of vitamin C could enhance immunity against pesticide toxicity by preserving the functional and structural integrity of important immune cells. (Chew, 1995).
In summary, CMZ treatment can induce immunobiochemical perturbations in exposed mice and vitamin C therapy mildly alleviates some of these perturbations. Further studies are needed in order to assess the possible relationships between antioxidants and CMZ-induced immunobiochemical perturbations.
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The research reported is funded by the private partnership.
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The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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This study was approved by the Social Science Ethical Committee of the Faculty of Science, Tanta University and complied with the Egyptian Code of Conduct for Scientific Practice, National Research Centre, Egypt.
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Nassef, M. Immunobiochemical modulations caused by clomazone in Swiss albino mice. JoBAZ 78, 4 (2017). https://doi.org/10.1186/s41936-017-0007-1
- Immunobiochemical perturbations
- Vitamin C
- Alleviating role