The ameliorative impacts of curcumin on copper oxychloride-induced hepatotoxicity in rats
The Journal of Basic and Applied Zoology volume 79, Article number: 44 (2018)
Copper oxychloride (COC) (50% of its component, copper) is copper-based fungicides. The present study aimed to investigate the possible protective effect of 80 mg/kg curcumin against the toxicity of 500, 1000, or 2000 mg COC per kilogram body weight for 90 days on the liver of a rat. Serum glutamic-pyruvic transaminase (SGPT), serum glutamic-oxaloacetic transaminase (SGOT), hepatic glutathione reduced content (GSH), and malondialdehyde (MDA) levels were detected. The histological and ultrastructure changes of the liver tissues as well as the hepatic content of copper, iron, manganese, and zinc were also reported.
COC-treated rats showed an increase of SGPT and SGOT, with the elevation of copper and zinc content and MDA levels with no change in GSH level. The liver showed a significant increase in the copper and iron contents. The liver of COC-treated rats showed histological and ultrastructural damage that increased with increasing the COC dose. Conversely, curcumin supplementation potentially recovered liver function enzymes in only low doses of COC, reduced MDA level, increased GSH content, and improved the hepatic lesions. These findings revealed that subchronic exposure to even low levels of COC may have potential hazards and harmful effects on the liver, and the curcumin markedly attenuated the COC biochemical, histological, and cellular alterations in liver tissues, best with the low dose of COC.
It is concluded that curcumin has a limited protective role against COC liver toxicity.
The copper oxychloride is a fungicide that specifically inhibits or kill fungi underlying diseases for keeping of consuming vegetables and fruits fresh for long periods in supermarkets (Osman et al. 2011). Hence, consumers and farm workers can be exposed to the fungicide residues in food and water during oral, inhalation, and dermal application (Damalas and Eleftherohorinos 2011). Understanding the mechanisms of fungicide action and toxicity is significant because humans encounter these pesticides through a broad assortment of applications (Kim et al. 2017).
The liver is the major organ responsible for metabolism, detoxification, and secretory functions in the body (Gebhardt 1992). Hence, it regulates various important metabolic functions in mammalian systems. Hepatic damage is associated with the distortion of these metabolic functions (Wu 2009). Copper is a micronutrient essential for life; copper follows a specific homeostatic regulation mechanism, which allows excess copper to be excreted mainly through the bile. Copper is absorbed, transported, distributed, stored, and excreted in the body according to complex homeostatic processes which ensure a constant and sufficient supply of the micronutrient while simultaneously avoiding excess levels (Husak 2015). Target organs of excess copper after oral administration are the liver and the kidneys.
Curcumin (1, 7-bis (4-hydroxy-3-methoxyphenyl)-1, 6-heptadiene-3, 5-dione) is a group of phenolic compounds isolated from the roots of Curcuma longa (Zingiberaceae) and has long been used as a spice in Indian dishes and as a drug in the traditional Indian system of medicine that helps in preventing certain diseases. The active portion of curcumin is turmeric, has been shown to have significant antioxidant activity, both in vitro and in vivo (Joe et al. 2004) with the responsibility of H-atom donation from the phenolic group (Jovanovic et al. 1999). Curcumin is a potent scavenger of reactive oxygen and nitrogen species (Reddy and Lokesh 1996) and protects biomembranes against peroxidative damage (Gao et al. 2013; Priyadarsini 1997). The antioxidant activity has been proven to have an important role in the regulation of physiological and pathological process by contribution in the protection of cells and tissues against deleterious effects of reactive oxygen species and other free radicals (Otuechere et al. 2014). Curcumin has been used for the treatment and protection of liver disorder in many research (Bruck et al. 2007; Farombi et al. 2008; Fu et al. 2008; García-Niño and Pedraza-Chaverrí 2014; Girish et al. 2009; Girish and Pradhan 2012; Manjunatha and Srinivasan 2006; Naik et al. 2004; Naik et al. 2011; Nanji et al. 2003; Park et al. 2000; Shen et al. 2007; Yousef et al. 2010).
Keeping this in view, the purpose of this investigation is to develop a biochemical, histological, and cellular study about the potential hepatotoxic effect of subchronic copper oxychloride treatment and the possible protective role of curcumin to modulate these effects in male albino rats.
Materials and methods
The commercial copper oxychloride contains 55% of its weight copper. It is a light green, very fine, non-free-flowing powder containing soft aggregates. It had been equipped from the central agricultural pesticide laboratory, ARC, Egypt. Corn oil solution of copper oxychloride of the required concentration (500, 1000, and 2000 mg/kg body weight) was prepared and administered orally to rats (0.5 ml/rat/day). The selected doses were selected according to the detected LD50 of copper oxychloride to a rat which was 5000 mg/kg body weight.
Curcumin was purchased in a powder form from Sigma chemical company, Egypt. Corn oil solution of whole curcumin of the required concentration (80 mg/kg body weight) was prepared and administered orally to rats (0.5 ml/rat/day) (Hashish and Elgaml 2016).
For this study, 54 adult male albino rats (Rattus norvegicus) (9-week-old, weighing 120–150 g) were purchased from the animal house, National Research Center, Cairo, Egypt. For adjustment, all rats were kept for a week under our laboratory conditions and were fed with pelleted food and tap water ad libitum. They were treated in accordance with the principles of Laboratory Animal Facilities (Council 2010). The rats were put in cages made of stainless steel in a temperature-controlled room (24 ± 2 °C) with a 12-h light and 12-h dull exposures. All rats were prevented of food and water 60 min before the start of the experiments.
The male rats were divided into nine groups, each consisting of six rats. The first group (control) was kept with none treatment, whereas the second group (oil) received orally 0.5 ml of corn oil by gastric tube. The third group (COC LD) was treated orally by a gastric tube with COC at daily doses of 500 mg/kg body weight. for 90 days, the fourth group (COC MD) was treated orally by a gastric tube with COC at daily doses of 1000 mg/kg body weight for 90 days, and the fifth group (COC HD) was treated orally by a gastric tube with COC at daily doses of 2000 mg/kg body weight for 90 days. The sixth group (curcumin) were treated with 80 mg/kg/rat curcumin for 90 days. The seventh group (COC LD + Curcumin) were treated with 80 mg/kg/rat curcumin additionally to 500 mg/kg COC by oral tube diluted with 0.5 ml corn oil for 90 days. The eighth group (COC MD + Curcumin) were treated with 80 mg/kg/rat curcumin additionally to 1000 mg/kg COC by oral tube diluted with 0.5 ml corn oil for 90 days. The ninth group (COC HD + Curcumin) were treated with 80 mg/kg/rat curcumin additionally to 2000 mg/kg COC by oral tube diluted with 0.5 ml corn oil for 90 days.
At the end of the treatment period, the rats were anesthetized using chloroform according to Saleem et al. (2017) using the guide and care of using experimental animals (Olfert et al. 1993); blood samples were collected to measure the blood serum biochemical parameters from the retro-orbital blood vessel of all the rats according to Hui et al. (2007). The blood serum obtained after centrifugation (3000 rpm for 10 min at 4 °C) was used for varied biochemical assays. Following the collection of blood samples, all experimental and control groups were sacrificed 24 h after the last dose by cervical dislocation, and therefore, the liver from every rat was removed and washed with saline solution. All the enzyme analyses were done among 1 week of collecting the samples. One gram from liver tissue samples was instantly frozen and hold on at − 40 °C for the next estimation of MDA, GSH, and determination of element (copper, iron, manganese, and zinc) within the liver. The other liver tissue specimens were kept in appropriate fixatives for the histopathological examination and therefore the ultrastructure study.
The activities of serum glutamic-pyruvic transaminase (SGPT) and serum glutamic-oxaloacetic transaminase (SGOT) were determined by the colorimetric technique of Reitman and Frankel (1957) using an assay kit. The lipid peroxidation level biomarker in the liver was estimated by the thiobarbituric acid technique and measured according to Ohkawa et al. (1979), and GSH was measured in the liver according to Hissin and Hilf (1976) using commercial kits instructions. Copper, zinc, iron, and manganese concentrations in liver tissues were measured by atomic absorption spectrophotometry by digestion with a combination of nitric acid and perchloric acid (6:1, v/v), and also, the digestion was delivered to constant volume with double distilled deionized water (Luterotti and Juretić 1992).
Liver tissues of treated and control rats were fixed with 10% neutral buffered formalin solution. The fixed specimens were cut, washed, dehydrated in ascending grades of ethyl alcohol (70%, 80%, 90%, 95%, and 100%), cleared in xylene, embedded in paraffin (60 °C melting point) then sectioned (4–6 μm), and stained with hematoxylin and eosin (Fischer et al. 2008) or stained with Masson trichrome (Goldner 1938) for histomorphological examine and sectioned for immunohistochemical determination of caspase 3 expression (Key 2006).
Ultrastructure study (transmission electron microscopy)
A small piece of liver was excised and then cut below a dissecting microscope in the presence of 2% glutaraldehyde. Liver specimens were immersed in 2% glutaraldehyde fixative in 0.1 M Na-cacodylate buffer for 24 h, then washed in 0.1 M phosphate buffer at 4 °C and post-fixed in 1% osmium tetraoxide. After dehydration in a graduated series of ethyl alcohol, the tissues were infiltrated in resin. Blocks with tissues were cut into semi-thin sections, then stained with toluidine blue and examined using a light microscope. Representative fields of semi-thin sections were selected. Ultrathin sections were stained with uranyl acetate and lead citrate (Sato et al. 2008) and examined with transmission electron microscope (JEOLJEM-2100, Japan) within the Electron Microscope Unit, Faculty of Agriculture, Mansoura University, Mansoura, Egypt.
Data were analyzed using SPSS version 17.0 for Windows. All values given within the text were expressed as mean ± standard error (SEM). One-way analysis of variance (ANOVA) test was used to compare the differences between the groups followed by post hoc Duncans multiple range test. Test p ≤ 0.05 was considered significant.
Effects of COC and curcumin on serum enzyme levels
The results of SGPT and SGOT activities in liver tissues of all groups are listed in Table 1. Treatments with curcumin alone and corn oil did not change the activities of SGPT and SGOT as compared to the control group. There was a hepatotoxicity after 500, 1000, and 2000 mg/kg body weight with COC treatments for 90 days, as evidenced by significant increases (p < 0.05, p < 0.05) in SGPT and SGOT levels compared to control rats. The higher dose treatment with COC induced higher significant (p < 0.05) levels of serum liver biomarker enzymes SGPT and SGOT than controls. Curcumin and oil group exhibited similar effects on serum biochemical parameters when compared with controls. COC LD + Curcmin group had significantly (p < 0.05) reduced SGPT and SGOT activities compared to the COC LD group.
Effects of COC and curcumin on liver GSH reduced and MDA levels in rats
Results indicated that COC MD and COC HD demonstrated a marked increase of hepatic MDA levels and non-significant change to the GSH levels compared to the control group (p < 0.005). COC LD + Curcmin group altered the above changes by regulating the MDA level and GSH to nearly that of the control. Curcumin only and corn oil administered alone did not alter the lipid peroxidation and GSH reduced levels when compared with the control. However, supplementation of curcumin and COC to rats significantly (p < 0.05) attenuated the increase in lipid peroxidation levels and restored the GSH levels (Table 2).
Effects of COC and curcumin on hepatic trace element in rats
Copper, iron, and zinc were significantly (p ≤ 0.005) increase by treating rats with copper oxychloride compared to the control rat (Table 3). Rat treated with curcumin and COC decrease the copper content compared to the treating groups with COC only but non-significant compared to the control group. Rat treated with curcumin and COC significantly decrease the iron and zinc content and significantly increase the manganese content compared to the control group.
Histopathological results of liver
The liver of control rat showed no marked differences with the normal structural organization of the hepatic lobules with normal polygonal hepatocytes containing central oval-shaped nuclei surrounded the central vein (Fig. 1a). Additionally, no detectable histological differences were observed between the livers of control rats and rats supplemented with corn oil and/or curcumin extract (80 mg/kg body weight) treatment for 90 days. They preserved the liver parenchyma with the appearance of the hepatocytes; sinusoids and Kupffer cells were similar to the control histomorphology (Fig. 1c, d, respectively). The hepatocytes were arranged in strands alternating with blood sinusoid lined with endothelial and Kupffer cells forming a network around the central vein (Fig. 2a).
The liver of a rat treated for 500, 1000, and 2000 mg/kg body weight COC for 90 days (Fig. 2) showed congestion of the central and portal veins, hydraulic degenerating of hepatocytes, necrotic lesions, the pyknotic nucleus in addition to infiltration of inflammatory cells in the COC-treated groups. The histopathological changes of the liver were obliviously increased with treatment 2000 mg/kg body weight COC, and the liver cells were degenerated and suffered from mild fatty infiltrations. Concurrent treatment with curcumin extract attenuated the extent and severity of the histological features of liver damage induced by COC alone. Animals treated with curcumin and COC 500 mg/kg for 90 days revealed that the majority of these histopathological changes were diminished, and the liver tissue restored most of its normal structure. Rats treated with curcumin and COC 1000 and 2000 mg/kg for 90 days, respectively, reduced necrosis, but some of the intra-hepatic vessels (the central and portal vessels) were still congested and some hepatocytes appeared with vacuolized cytoplasm involved with the dissolution and degeneration of hepatic cords with necrotic nuclei, which were the most pronounced pathological abnormalities observed. Several of the hepatocytes were fused together forming degenerated areas of destroying cells that lost their normal characters, and Kupffer cells were increased. The repairing effects-up were in the curcumin and COC for 90 days treated group were to certain limits; the hepatic lobules showed normal centrilobular hepatocytes with slightly dilated hepatic sinusoids and mild vacuolar degeneration of the adjacent hepatocytes. Also, few cells still appeared with cytoplasmic vacuolization and pyknotic nuclei with a reduction in inflammation. Rat treated with curcumin and 500 mg/kg COC for 90 days exhibited the appearance of giant multinucleated hepatocytes.
The histochemical staining of liver
For revealing the deposition of collagen fibers, the liver sections were stained with Masson’s trichrome. Collagen fibers were stained blue by the Masson’s trichrome; the increase of collagen fibers was absent in the liver of COC-treated rats around the central vein and in the blood sinusoids even the congestion portal vein and bile duct compared to the control and curcumin group (Fig. 3).
The immunohistochemical staining of the liver
Qualitative evaluation showed focal caspase 3 reactions in the slides prepared from control and experimental animals (Fig. 4). The color reaction was bright, pale pink and filled evenly the whole hepatocyte cytoplasm. Weak-intensive reaction was found in the COC-treated group. The intensity of the positive reaction was almost the same in the control and treated curcumin with COC groups.
Ultrastructure changes in rat liver
The ultrastructural examination of the liver sections of the control group Fig. 5 exhibited ideal hepatocytes with normally round nucleus with evenly distributed chromatin, sometimes slightly condensed along the nuclear membrane in hepatocytes; the nucleus is easily distinguished with numerous round, oval, elongated rod-like mitochondria with membranous cristae and electron dense matrix. The normal rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER) occurred in glycogen-rich areas.
The ultrastructure of a hepatocyte of the liver after curcumin treatment 80 mg/kg body weight for 90 days did not show any changes comparing to the ultrastructure of hepatocytes of the control. In contrast, the hepatocytes of the liver sections from the group treated with 500 mg/kg body weight COC Fig. 6a showed ultrastructure alteration, including irregularity and degenerative changes in the nuclear membrane. Shrunken and pyknotic nuclei in the degenerated hepatocyte were seen. The cytoplasm was condensed and contained degenerative changes such as condensed, atrophied, and damaged mitochondria with no cristae, in the majority of mitochondria. Also, the intra-mitochondrial granules disappeared; varieties of mitochondria were small, large, branching, and budding; and the RER was decreased in amount. Dilated intercellular spaces were observed between hepatocytes. Early phases of apoptosis and atrophic nuclei were also detected. Disrupted RER and numerous different sizes lysosome were also seen. Cytoplasmic vacuolization and dilated bile canaliculi with damage and atrophy of its microvilli as well as swollen and damaged Kupffer cell with irregular nuclear membrane were also observed. The hepatocytes of the liver sections from the group treated with 2000 mg/kg body weight COC (Fig. 6a) showed severe cytoplasmic vacuolization and cristae loss in mitochondria; some shape varieties of mitochondria are small, large, branching, and budding; and collagen fiber deposition and other degenerative changes were observed. However, curcumin with the COC (Fig. 6b, d) showed markedly attenuated remarkable improvement from the COC-treated group; most of the hepatocytes nuclei, cytoplasmic organelles, intercellular space, bile canaliculi, and Kupffer cells were more or less normal. The mitochondrial matrix recovered its density, and intra-mitochondrial granules gradually appeared, but there were still recognized a few mitochondria without granules, and most of the organelles appeared in a healthier appearance.
The present investigation was suggested to explore the precise long-term toxic effects of COC fungicide exposure in male rats. The results of this study indicated that treatment of rats with COC caused significant alterations in the liver enzymes SGPT and SGOT activities which are known marker enzymes for the assessment of the functional integrity of the liver cells (Cohen and Kaplan 1979). These enzymes are usually raised in acute hepatotoxicity or mild hepatocellular injury or extrahepatic obstruction (Thapa and Walia 2007) but tend to decrease with prolonged intoxication due to damage to the liver (Cohen and Kaplan 1979). In this study, the activities of serum SGPT and SGOT were significantly increased in the COC groups. On the other hand, curcumin administration to rats treated with COC produced an appreciable improvement in the hepatotoxic effect by the reversal of 500 and 1000 mg/kg body weight Also, the curcumin group and oil group produced a non-significant increase to the SGPT and SGOT levels. The recorded changes in these biochemical parameters were substantiated by the histopathological changes. The present work displayed hepatocellular damage as a dose-dependent lesion. The rise in serum SGPT and SGOT activities may be a result of the sudden change in tissue permeability, cell fragmentation, or from a specific phase of progressive cellular damage (McIntyre 2004).
Copper oxychloride caused an increase content of MDA in the liver as a measure of lipid peroxidation, which accompanied by damage of hepatocytes and no relevant effect to the GSH concentration compared to those of controls. The increase content of MDA in the liver may be due to the increase of copper content in the liver, and the absence of change in the glutathione-reduced content in the liver is not in agreement to other studies, which found the depletion of hepatic glutathione content resulting from copper increase (Ozcelik et al. 2003)
Treatment of curcumin, along with COC treatment, decreased the COC-induced changes in hepatic lipid peroxidation and restore glutathione-reduced levels. The observed protective activities of curcumin extract against COC-induced hepatotoxicity could be attributed to the various anti-oxidant compounds present in the extract (Madsen and Bertelsen 1995) which reduce the lipid peroxidation and stabilize to an extent the liver cell membrane, and that result is in agreement to previous studies of curcumin as hepatoprotective to different liver toxicity treatment (Farombi et al. 2008; García-Niño and Pedraza-Chaverrí 2014; Girish et al. 2009; Girish and Pradhan 2012; Singh and Sharma 2011).
Copper, iron, and zinc were significantly increased by treating rats with COC, and this is due to the interaction of the absorption of these trace elements with each other (Chin et al. 2014). The significant increase of zinc with the increase of copper is not similar to the studies of Abdulla and Chmielnicka (1989) that showed treatment with zinc induce copper deficiency. Rat treated with curcumin and COC decrease the copper content compared to the treating groups with COC only but non-significant compared to the control group. Rat treated with curcumin and COC significantly decrease the iron and zinc content and significantly increase the manganese content compared to the control group, and these are due to the action of curcumin as a chelating agent for iron, copper, and zinc (Baum and Ng 2004; Chin et al. 2014). The oil group showed a significant increase to the iron and zinc liver content due to its content of trace amounts of metals, which may be from mineral uptake from the soil or from the agrochemicals compound or metal contamination from using metal equipment in the production processes, storage, and transportation (Nnorom and Ewuzie 2015).
Histological alterations of COC shown within the present investigation are nearly identical as compared to those seen with the findings of others exposure to copper. The histologic changes of hepatic tissues showed congestion of the central vein and portal triad vessels and these agreements to Doudi and Setorki (2014) that found histopathological changes in liver induced by the nanoparticles of copper. The appearance of inflammatory cells within the hepatic tissue could also be because of the interaction of copper with proteins and enzymes of the hepatic interstitial tissue with antioxidant defense mechanism which can result in generating the reactive oxygen species (ROS) that sucessively initiate the inflammatory response (Fubini and Hubbard 2003). The results of the current work showed that COC exposure damages the hepatocytes with cytoplasmic inclusions and may be due to the unable to upset with the accumulated residues from metabolic and structural disturbances caused by copper.
The cytoplasmic swelling with hydropic degeneration as observed within the results of the current investigation might result from the leakage of lysosomal hydrolytic enzymes that lead to cytoplasmic degeneration (Del Monte 2005). COC caused caspase 3 inhibition which confirmed the necrotic effect (Coelho et al. 2000) of these antifungal pesticides to the liver tissue.
The present results showed that treating rats with COC and curcumin improved and ameliorated the biochemical changes and confirmed by histopathological and cellular observations.
Exposure to the fungicide COC could potentially harm human health, which provides evidence of hepatotoxicity. The fungicide induced significant alterations in the hepatic function and an increase of hepatic lipid peroxidation in rats with a consequent histopathological and cellular damage. The results set up the possibility of curcumin being considered as one of the components of the regular diet of people to protect and reduce most of the hepatic damage caused by fungicide COC in the liver. The mechanism appeared mostly to be mediated by counteracting free radical reduction generated by COC.
- COC HD:
Copper oxychloride 2000
- COC LD:
Copper oxychloride 500
- COC MD:
Copper oxychloride 1000
Hepatic glutathione reduced content
Serum glutamic-oxaloacetic transaminase
Serum glutamic-pyruvic transaminase
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Availability of data and materials
The datasets generated and analyzed during the current study is available from the corresponding author on reasonable request.
Ethics approval and consent to participate
This study was carried out and approved in accordance with the ethical rules for handling the experimental animals, Zoology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt.
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The authors declare that they have no competing interests.
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Gad El-Hak, H.N., Mobarak, Y.M. The ameliorative impacts of curcumin on copper oxychloride-induced hepatotoxicity in rats. JoBAZ 79, 44 (2018). https://doi.org/10.1186/s41936-018-0059-x