Abstract
The present study investigates the nephrotoxic effects of two acute doses of silver nanoparticles (AgNPs) and silver nitrate (AgNO3) on the African catfish, Clarias gariepinus, using biochemical, histochemical, and histopathological changes as biomarkers. AgNP-induced impacts were recorded in some of these characteristics on the bases of their size (20 and 40 nm) and concentration (10 and 100 μg/L) but no significant interaction between size and concentration. AgNO3 had low significant adverse effects on some parameters in comparison with those impacts of AgNPs. The concentrations of creatinine and uric acid exhibited different significant variations under stress in all exposed groups compared with those in the control group. On the tissue and cell levels, histopathological changes were observed. These changes include hypertrophies of glomeruli, proliferation in the haemopoietic tissue, dissociation in renal tubules, shrinkage of glomerulus, hydropic degeneration, dilatation of renal tubules, aggregation of melanomacrophages, rupture of Bowman’s capsule, and the glomerular tuft and dilatation of Bowman’s space. In more severe cases, the degenerative process leads to tissue necrosis in the kidney of AgNP-exposed fish as well as carbohydrate depletion; a faint coloration was also observed in the brush borders and basement membrane with a large amount of connective tissue fibers around the blood vessels and the renal tubules. Recovery period for 15 days led to improvement of most of the alterations in biochemical, histopathological, and histochemical parameters induced by AgNPs and AgNO3. In conclusion, one can postulate on the sensitivity of the kidney of C. gariepinus to AgNPs and recovery strategy is a must.
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Introduction
Nanotoxicology refers to the study of the interactions of nanostructures (1–100 nm) with biological systems on the bases of the relationship between their physical and chemical properties and the toxic biological responses (Asharani et al. 2009; Yang et al. 2009). These responses include growth and reproduction impairment, mortality, and physiological, biochemical, and histological functions in both adult and embryos (Abarghoei et al. 2016; Abdel-Khalek et al. 2015; Al-Bairuty et al. 2013; Alkaladi et al. 2015; Mekkawy et al. 2019; Pournori et al. 2017; Sayed 2016). The small size, chemical composition, surface structure, solubility, shape, agglomeration, and aggregation of these particles may be associated with NP-induced toxicity (Nel et al. 2006; Skebo et al. 2007; Wallace et al. 2007). In spite of their toxicity which must be controlled and managed, nanoparticles have a wide increased spectrum of society benefits in different fields (Attia 2014; Mekkawy et al. 2019; Sayed 2016; Sayed and Soliman 2017; Sayed and Younes 2017). Due to their unique optical, electrical, and thermal properties, silver nanoparticles (AgNPs) are one of the most common types of nanoparticles in use serving various industrial and domestic purposes (Farkas et al. 2010; Morones et al. 2005; Skebo et al. 2007). Such economic success led to their presence in the aquatic environment with the increasing risk of potential adverse effects on aquatic animals including fishes (Mekkawy et al. 2019). Different studies focused on the adverse impacts of AgNPs on fishes identifying a wide spectrum of biomarkers (Asharani et al. 2008; Bar-Ilan et al. 2009; Bilberg et al. 2011; Chae et al. 2009; Choi et al. 2009; Griffitt et al. 2009; Mekkawy et al. 2019; Powers et al. 2010; Sayed 2016; Sayed and Soliman 2017; Wu et al. 2010; Yeo and Kang 2008.). The AgNPs are taken through the skin, gills, and alimentary tracts and are translocated to different organs through the circulatory and lymphatic systems (Panyala et al. 2008) exhibiting variable degrees of toxicity especially in the liver and kidney. On the other hand, silver ions were reported to have dose-dependent effects on fish (Sayed and Soliman 2017).
Biochemical parameters are fundamental in the physio-pathological evaluation of animals (Juneja and Mahajan 1983; Ranzani-Paiva et al. 1999; Sayed and Authman 2018) with identification of the target organs of toxicity (Dube et al. 2014; Sayed et al. 2011; Sayed and Hamed 2017). For example, nephrotoxicity manifests as renal failure with a rise in serum creatinine and uric acid levels (Kotb et al. 2018; Uboh et al. 2009). Serum creatinine and uric acid are some waste metabolic products excreted exclusively via the kidneys so they provide useful information about the health status of the kidney. High levels of such chemicals indicate malfunction of the kidney (Abdel-Khalek et al. 2015; Ajeniyi and Solomon 2014; Alkaladi et al. 2015; Giordano et al. 2015; Noureen et al. 2017; Panda 1999) and histopathological alterations which can be used also as indicators for the effects of various pollutants (Abarghoei et al. 2016; Johari et al. 2015; Mansouri and Johari 2016; Pournori et al. 2017; Ramesh and Nagarajan 2013; Yazdanparast et al. 2016).
According to the aforementioned findings, the present work was suggested and aimed to study the nephrotoxicity of the kidney of the African catfish, Clarias gariepinus (Burchell, 1822) induced by AgNPs and AgNO3 in an attempt to determine the histopathological and histochemical biomarkers in corresponding with the biochemical biomarkers of the kidney (creatinine and uric acid).
Materials and methods
Silver nanoparticle characterization
Silver nanoparticles with a size of 20 and 40 nm were purchased from Nanostructured and Amorphous Materials Inc. (Houston). The characterization of these silver nanoparticles was studied and identified in detail by Mekkawy et al. (2019) with confirmation of their crystalline nature in Assiut University Labs. X-ray diffraction (four Bragg reflections at 38.114°, 44.298°, 64.441°, and 77.395° corresponding to 111, 200, 220, and 311 sets of lattice planes, respectively) and stability of AgNPs as well as their average sizes estimated by transmission electron microscope (average particle size and SD of 11.21 ± 4.13 and 32.62 ± 13.48 for 20 nm and 40 nm of AgNPs, respectively) were considered in this concern.
Fish
Juveniles of the African catfish, C. gariepinus, were collected from private fish farm in May 2015 then transported to the Fish Biology and Pollution laboratory, Zoology Department, Faculty of Science, Assiut University. Fish were fed with a commercial fish food (5% body weight) twice a day and kept at approximately in 28 °C with 12 h:12 h light-dark cycle in many tanks (100 L each) for 3 months to acclimatize to laboratory conditions prior to experiments. During the acclimation period, about 20% of the water in each tank was replaced daily. Fish ranged between 23.5 and 32 cm in total length and 70 and 110 g in weight. The water used to raise the fish was dechlorinated and continuously aerated tap water. The water temperature, pH, and dissolved oxygen concentrations (DO) were measured daily (29.17 ± 0.27 °C, 8.5 ± 0.03 pH, and 34.47 ± 11.99 mg/L DO).
Experimental design and AgNP exposure
The acclimatized fishes were randomly divided into 6 groups, control and five exposed ones. Each group contains 12 specimens in a glass tank measuring 100 × 35 × 50 cm (L × W × H) with a total volume of 100 L. These fish groups are the control, 20 nm/10 μg/L AgNPs, 20 nm/100 μg/L AgNPs, 40 nm/10 μg/L AgNPs, 40 nm/100 μg/L AgNPs, and 100 μ/L silver nitrate (AgNO3). Exposure period was 15 days followed by a 15-day recovery period. To minimize the decrease in the nominal concentration of AgNPs, which potentially adsorb onto residual food and feces in the test water, each experimental aquarium was supplied with food for 1 h prior to dosing.
Dosing stocks of the silver particles were made by suspending 1.5 mg of each particle in 1-L ultrapure water and sonicating for 30 min and diluting as required. The silver nitrate dosing stock (1.5 mg/L) was also made up in ultrapure water and sonicated similarly. Experimental tanks were filled with dechlorinated water and dosed by chemicals with immediate addition of the fish to minimize reduction of nominal dosing concentrations through adhesion of the particles/chemicals to the glass. Then, every 48 h, 75% of tank water was changed and immediately re-dosed.
Biochemical analysis
At the end of the experimental periods, six fish from each group were collected and anesthetized using a 200-ppm solution of clove powder (Hedayati and Jahanbakhshi 2012). Blood samples were collected from the caudal veins of fish and allowed to clot in clean, dry centrifuge tubes at room temperature then centrifuged at 5000 rpm, at 4 °C for 20 min, and the serums were separated for the analysis of biochemical parameters (creatinine and uric acid). Biochemical kit of creatinine and uric acid was purchased from Bio-Merieux Co., France.
Histological and histopathological examination
For microscopic preparations, after intervals of 15-day exposure and 15-day recovery period, 4 fish of each group were removed and sacrificed. Small pieces of the kidney tissue were taken and immediately fixed in 10% neutral buffered formalin. Fixed tissues were processed routinely for paraffin embedding technique. Embedded tissues were sectioned at 5 μ in thickness and then stained by the following stain: Harris’s hematoxylin and eosin stain (HE) (Bancroft and Stevens 1982). Ten randomly selected sections of four fish from each experimental group were chosen to indicate each histopathological parameter as (control, − no alteration (0–2); mild, + (> 2–10%) area of section; moderate, ++ (> 10–40%) area of section; and severe, +++ (> 40% area of section). Finally, tissues were examined and imaged using an Omax advanced trinocular biological microscope with a 14-MP USB digital camera (A35140U3; China). Measurements were made on images of the kidney tissue. The cross-sectional area of altered tissue as well as the total area of the histological section was estimated according to the Motic Images Plus 2.0 program.
Histochemical preparation
Estimation of general carbohydrates represents the important parameters among the histochemical ones. For the demonstration of the polysaccharides status, the periodic acid Schiff’s (PAS) technique was applied (Mc Manus 1946). In this regard, carbohydrates were first-oxidized with 0.1%periodic acid; aldehyde groups (-HCO-HCO) were liberated from the glycol reagent, producing a compound of magenta coloration.
Statistical analysis
The basic statistics, means, standard errors, and ranges of the measured parameters were estimated. Levene’s test of equality of error variance of the variables was applied, with rejection of the null hypothesis for raw, log-transformed, and SQRT-transformed data. So, the homogeneity of variance was assumed for raw data. The pattern of variations in the parameters considered due to the size and concentration of the AgNPs and size-concentration interaction was studied by the two-way ANOVA. Moreover, in the absence of interactions, the pattern of variations was recorded by the one-way ANOVA in all the exposed and control groups. The Tukey HSD test was considered for multiple comparisons. The IBM-SPSS package version 21 (IBM-SPSS 2012) and Xls sheets were considered at 0.05 significance level.
Results
Kidney functions
The creatinine levels of Clarias gariepinus for 15 days of exposure and 15 days of recovery periods are given in Table 1. The main effects of AgNP size and concentration on creatinine and uric acid levels were significant with no significant size-concentration interaction. In the recovery period, such significant main effects were eliminated except for the main effect of concentration factor which is still significant for uric acid. In comparison with the control and silver nitrate groups, the creatinine and uric acid levels of the nanoparticle-exposed fish exhibited significant variability (Table 1). After 15-day recovery, the pollutant adverse effects on the creatinine level were eliminated in comparison with the control whereas such effects are still recorded to some extent in uric acid (Table 1).
Histopathological and histochemical studies
Control kidney
The kidney of the control fish Clarias gariepinus is composed of a large number of nephrons (Fig. 1a). Each nephron is composed of a roughly spherical corpuscle enclosing a tuft of blood capillaries with Bowman’s space, renal tubules, and collecting tubules. These structures are surrounded by haemopoietic tissue. The renal tubules are numerous and their cross sections exhibit a round or oval outline with a narrow lumen. Their lining coat is composed of columnar epithelial cells with markedly eosinophilic cytoplasm and centrally located nuclei. The collecting tubules are lined with cubical or low columnar epithelial cells with basally located nuclei (Fig. 1a). However, in the control kidney of fish, low damage of 4.14% was recorded in kidney sections examined. Histochemically, the PAS technique displayed a positive reaction mainly at the brush border and at the basement membrane of the renal tubules. Renal (Malpighian) corpuscles appeared moderately reacted (Fig. 2a).
Exposure of Clarias gariepinus to100 μg/L of silver nitrate
The silver nitrate dose used for 15 days of exposure led to adverse impacts on the kidney including hydropic degeneration and dissociation, hypertrophy of glomerulus, and necrosis in some renal tubules and haemopoietic tissue. Proliferation in renal tubules and melanomacrophages were also observed (Fig. 1b). Such impacts are reflected in terms of morphometric data and semiquantitative evaluations of the histopathology of the AgNO3-exposed kidney of C. gariepinus (Tables 2 and 3) with 33.7% of damage.
After 15 days of recovery, healthy glomeruli, structural improvement of some of the renal tubules, and the absence of melanomacrophages were recorded whereas the haemopoietic tissue is still exhibiting necrosis. Marked proliferation and hyaline degeneration in the renal tubules with reduced lumen were also observed (Fig. 1g, h) with 18.83% of damage (Table 2).
PAS reaction revealed carbohydrate depletion observed as faint coloration of the glomerulus and basement membrane after 15 days of exposure compared with those of the control (Fig. 2b). After 15 days of recovery, large amount of carbohydrate was observed in the glomerulus, basement membrane, and the brush border (Fig. 2g, h).
Exposure of Clarias gariepinus to 10 μg/L of silver nanoparticles (20 nm)
The kidney of fish exposed to 10 μg/L of silver nanoparticles for 15 days showed severe damage in the renal tubules with dissociation, necrosis, and proliferation. The haemopoietic tissue also exhibited proliferated under stress. Glomerulus showed shrinkage and hence increasing in the Bowman’s space (Fig. 1c). In terms of the morphometric data and semiquantitative evaluations of the histopathology in exposed kidney of C. gariepinus (Tables 2 and 3), a damage of 51.67% was recorded.
After 15 days of recovery period, improvement in the renal tissue, in glomeruli, and in haemopoietic tissue were observed to some extent. Some of the renal tubules showed normal structures and some showed hydropic degeneration and dissociation (Fig.2g, h) with a damaged percent of 65.51% (Table 2).
Under silver nanoparticles, examination of PAS-exposed kidney sections of silver nanoparticles showed great decline in carbohydrate materials as reflected by the feebly stained renal corpuscle after 15 days of exposure. Also, the basement membranes and brush borders of the renal tubules were suffering from great deficiency of carbohydrate materials (Fig. 2c). After 15 days of recovery, moderate carbohydrate material localization was observed in the renal tissue (Fig. 2g, h).
Exposure of Clarias gariepinus to 100 μg/L of silver nanoparticles (20 nm)
Increasing the concentration of AgNPs of 20 nm led to severe alterations including rupture of Bowman’s capsule with disorganization in the glomerular tuft and glomerulus shrinkage with increasing in the Bowman’s space. Dissociation of indistinct lumen and focal tubular necrosis and necrotic area was also recorded. Proliferation and degeneration of the epithelial cells lining the renal tubules and of the parietal cells of renal corpuscles were observed (Fig. 1d); damage was represented by 85.97% (Tables 2 and 3).
After 15 days of recovery, kidney sections showed improvement in the renal tubules, renal corpuscle, and haemopoietic tissue. However, some other tubules showed hydropic degeneration and dissociation (Fig. 1g, h) with a general damage of 58.13% (Table 2).
The application of PAS reaction showed great decline in carbohydrate materials as reflected by the feebly stained renal corpuscle after 15 days of exposure. Also, the basement membranes and brush borders of the renal tubules were suffering from a great deficiency of carbohydrate materials (Fig. 2d). After 15 days of recovery, moderate carbohydrate material localization was revealed in the renal tissue (Fig. 2g, h).
Exposure of Clarias gariepinus to 10 μg/L and 100 μg/L of silver nanoparticles (40 nm)
As regards the two concentrations of AgNPs of 40 nm in size, severe alterations in the fish kidney structures in terms of histopathology and PAS reaction (Figs. 1 and 2) were recorded with variability after 15 days of exposure. These alterations were improved by 15-day recovery period. These patterns of damage (Figs. 1 and 2e, f) and recovery improvement (Figs. 1 and 2g, h) were similar to those considered in the case of the two concentrations of AgNPs of 20 nm in size previously mentioned (Tables 2 and 3) with a variable percent of damage.
Discussion
The evaluation of biochemical characteristics in fish has become an important health indicator (Mekkawy et al. 2019; Saravanan et al. 2011; Sayed and Authman 2018). Serum creatinine and uric acid can be used as a rough index of the glomerular filtration rate and kidney dysfunction (Ajeniyi and Solomon 2014; Maita et al. 1984). The results in the present study indicated a significant increase in serum creatinine and uric acid of C. gariepinus exposed to AgNPs for 15 days. These results were in agreement with (Abdel-Khalek et al. 2015; Alkaladi et al. 2015) who observed a highly significant increase in serum creatinine and uric acid of Nile tilapia, Oreochromis niloticus, after exposure to copper and zinc oxide nanoparticles respectively. This elevation of serum creatinine level may be related to kidney dysfunction. In the present work, a recovery period for 15 days improved creatinine and uric acid levels compared with that of control group of Clarias gariepinus. Different authors referred to the requirement of the recovery period to remove the impacts of pollutants (Gaber 2007; Shaw and Handy 2006).
Histological studies by different authors and the present study were found to be a useful tool for assessing the damage of different tissues caused by nanomaterial (Abarghoei et al. 2016; Johari et al. 2015; Mansouri and Johari 2016; Pournori et al. 2017; Yazdanparast et al. 2016). In the present study, the impact of the AgNPs was observed in the tissue kidney with different degrees of variable impacts and alterations. These impacts and alterations are in agreement with those observed in Zebrafish (Danio rerio) exposed to silver nanoparticles (Yazdanparast et al. 2016), in Cyprinus carpio L. exposed to copper (Al-Tamimi et al. 2015) and in Oreochromis niloticus and Clarias gariepinus exposed to cadmium and atrazine (Mekkawy et al. 2013; Mekkawy et al. 2012), respectively, and in Clarias gariepinus exposed to silver nanoparticles (Sayed and Younes 2017).
The damage recorded in the kidney and accordingly in erythropoiesis was confirmed in the first part of this study as erythrocytes alterations and erythrocytes account decrease (Mekkawy et al. 2019). The kidney damages especially in the glomeruli and renal tubules were interpreted by different authors including Bucher and Hofer (1993), Robbins and Angell (1976), Thomson (1984), and Tu (1991). In the present work and those of Khidr et al. (2001), Mekkawy et al. (2013), Mekkawy et al. (2012), Mohamed (2006), and Wassif et al. (2000), these damages were also recorded by PAS reactions in terms of carbohydrate depletion under stress.
Conclusion
The AgNO3 and silver nanoparticles in different concentrations lead to adverse impacts on physio-biochemical parameters and damage the function and histopathology of the kidney of C. gariepinus. So, the use and application of such chemicals should be managed and controlled to protect the aquatic ecosystems. Moreover, the recovery strategy of pollutants is a must for fish species according to their positions in the food web.
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Highlights
• AgNPs were tested in catfish.
• AgNP-induced kidney functions alterations in Clarias gariepinus.
• Histopathological changes were observed in a dose-dependent manner.
• Recovery period improved some alterations after AgNP exposure period.
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Mahmoud, U.M., Mekkawy, I.A.A., Naguib, M. et al. Silver nanoparticle–induced nephrotoxicity in Clarias gariepinus: physio-histological biomarkers. Fish Physiol Biochem 45, 1895–1905 (2019). https://doi.org/10.1007/s10695-019-00686-7
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DOI: https://doi.org/10.1007/s10695-019-00686-7