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Article

Myco-Synthesized Molluscicidal and Larvicidal Selenium Nanoparticles: A New Strategy to Control Biomphalaria alexandrina Snails and Larvae of Schistosoma mansoni with an In Silico Study on Induced Oxidative Stress

by
Mostafa Y. Morad
1,
Heba El-Sayed
2,
Ahmed A. Elhenawy
3,4,
Shereen M. Korany
5,
Abeer S. Aloufi
5,* and
Amina M. Ibrahim
6
1
Zoology and Entomology Department, Faculty of Science, Helwan University, Helwan 11795, Egypt
2
Botany and Microbiology Department, Faculty of Science, Helwan University, Helwan 11795, Egypt
3
Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
4
Chemistry Department, Faculty of Science and Art, Al Baha University, Mukhwah, Al Baha 6531, Saudi Arabia
5
Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
6
Medical Malacology Department, Theodor Bilharz Research Institute, Giza 12411, Egypt
*
Author to whom correspondence should be addressed.
J. Fungi 2022, 8(3), 262; https://doi.org/10.3390/jof8030262
Submission received: 11 February 2022 / Revised: 26 February 2022 / Accepted: 27 February 2022 / Published: 4 March 2022
(This article belongs to the Special Issue Fungal Nanotechnology 2.0)
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Versions Notes

Abstract

:
Schistosomiasis is a tropical disease with socioeconomic problems. The goal of this study was to determine the influence of myco-synthesized nano-selenium (SeNPs) as a molluscicide on Biomphlaria alexandrina snails, with the goal of reducing disease spread via non-toxic routes. In this study, Penicillium chrysogenum culture filtrate metabolites were used as a reductant for selenium ions to form nano-selenium. The SeNPs were characterized via UV-Vis spectrophotometer, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS), and X-ray diffraction (XRD). Myco-synthesized SeNPs had a significant molluscicidal effect on B. alexandrina snails after 96 h of exposure at a concentration of 5.96 mg/L. SeNPs also had miracidicidal and cercaricidal properties against S. mansoni. Some alterations were observed in the hemocytes of snails exposed to SeNPs, including the formation of pseudopodia and an increasing number of granules. Furthermore, lipid peroxide, nitric oxide (NO), malondialdehyde (MDA), and glutathione s-transferase (GST) increased significantly in a dose-dependent manner, while superoxide dismutase (SOD) decreased. The comet assay revealed that myco-synthesized SeNPs could cause breaks in the DNA levels. In silico study revealed that SeNPs had promising antioxidant properties. In conclusion, myco-synthesized SeNPs have the potential to be used as molluscicides and larvicides.

1. Introduction

Schistosomiasis is a serious illness that has impacted the lives of people and animals around the world [1]. Schistosoma mansoni is a widely distributed parasitic species in many regions in Africa, the Middle East, and South America, where the intermediate host, a freshwater snail named Biomphalaria (phylum Mollusca, class Gastropoda), is located [2]. Snails have great medical, veterinary, and economic importance as they are the causative agent in transmitting diseases that affect many animals [3]. Until now, praziquantel has been widely used to treat adult trematode as well as cestode worms, but it is less effective against juvenile stages [4]. Thus, the urgent need for control strategies has evolved to control the snail population [5,6]. The chemical control of snail populations has many disadvantages, especially that it is very expensive, toxic to the non-target organism, and could accumulate in the environment [7]. Biological control of snail populations is a low-cost and effective alternative to chemical molluscicides [8].
Nanotechnology is an emerging technology that has been rapidly developed over the last two decades to enhance and manage a wide range of issues and problems in fields, such as health, food, the environment, agriculture, and numerous industries [9,10]. The emergence of nano-sized components (1–100 nm) is accomplished through three main methods: physical, chemical, and biological reactions [11]. Chemical and physical synthesis methods generally involve unique processing components and difficult conditions, such as hazardous chemicals, pressure, controlled pH and temperature, and large equipment. Moreover, these production techniques are expensive and produce undesired by-products that cause difficulties in the environment [12]. In contrast to chemical and physical procedures, the biological strategy is distinguished by its simplicity, speed, safety for the environment, and relatively inexpensive [13]. As a result, researchers are focusing on the biological approach, or green technique, of producing nanomaterials, which employs fungi, bacteria, yeast, algae, actinomycetes, and plants [14,15,16].
Fungi are one of the living organisms involved in the green synthesis of nanoparticles [17]. Furthermore, because of fungi’s versatility, high metal tolerance, ease of handling, high biomass output, and commercial feasibility, fungi are well-suited for the production of a wide range of nanoparticles [18]. Penicillium chrysogenum is one of the most common fungi that produces a large variety of metabolites, such as various enzymes, roquefortines, siderophores, fungisporin, penitric acid, indole-3-acetic acid, chrysogine, hydroxyemodin, and chrysogenin [19,20,21]. As a consequence, it could be used to fabricate a variety of metal and metal oxide nanoparticles.
Selenium is an essential nutrient that is necessary for good health and regulates a variety of cellular processes via selenium proteins [22]. Selenium is essential in the prevention of a range of diseases, including infectious diseases, hypercholesterolemia, cardiovascular disease, and some malignancies. SeNPs have significant antibacterial activity in naked [23,24] and conjugated forms, such as the selenium nanoparticles-lysozyme nanohybrid system [25]. Despite these numerous benefits, large doses of selenium can have negative side effects. As a result, reports are now focusing on the use of nanomaterials to avoid high doses of Se metal while retaining biological effects [26]. SeNPs have received a lot of recent interest due to their unique properties and biological activities. Selenium nanoparticles have shown biomedical and larvicidal effects, and they can be used for infection control [27]. The strategy of NPs’ toxicity at the cellular level has not been completely identified, but it may result in membrane disruption, protein oxidation, interruption of energy transduction, genotoxicity, the release of toxic constituents, and the formation of reactive oxygen species (ROS) [28]. The current work was conducted to test the use of myco-synthesized SeNPs by exposing Penicillium chrysogenum culture filtrate metabolites to sodium selenite as a tool for biological control against the intermediate host, Biomphalaria alexandrina snails, as well as larval stages of Schistosoma mansoni.

2. Materials and Methods

2.1. Isolation Conditions of the Fungal Isolate

The studied fungus was isolated from stones collected on the Mediterranean’s southern coast, at Alexandria, Egypt. Isolation was done on a medium comprising 10.0 g saja peptone, 3.0 g of yeast extract, 3.0 g of malt extract, 10.0 g of glucose, 30.0 g of NaCl, 25.0 g of agar, 1000 mL of distilled water, pH 7.5. One thousand microliters per litre of streptomycin was provided after the media had cooled. The culture was incubated for five days at 25 °C.

2.2. Molecular Identification

The fungal isolate was cultured in Czapek’s yeast extract agar medium (CYA) for 7 days at 28 °C [29]. The fungal mat was filtered through Whatman’s filter paper No. 1, and mycelial DNA was isolated using the Patho-gene-spin DNA/RNA extraction kit as per the manufacturer’s instructions (Intron Biotechnology Company, Korea). SolGent Company in Daejeon, South Korea, performed the polymerase chain reaction (PCR) and rRNA gene sequencing. ITS1 (forward) and ITS4 (reverse) primers were incorporated into the reaction mixture for PCR. ITS1 (5′-TCC GTA GGT GAA CCT GCG G-3′) and ITS4 (5′-TCC TCC GCT TAT TGA TAT GC-3′) are the two primers used. With the addition of ddNTPs to the reaction mixture, the PCR product was sequenced using the same primers [30]. The obtained sequences were analyzed using the National Center of Biotechnology Information’s (NCBI) website’s Basic Local Alignment Search Tool (BLAST).

2.3. SeNPs Myco-Synthesis by P. chrysogenum

The mycosynthesis of SeNPs was carried out according to Amin et al. [31] with some modifications. P. chrysogenum was cultivated on potato dextrose broth and incubated in a static incubator for 7 days at 25 °C. Mycelia were then separated from the culture supernatant by centrifugation (Sigma, 3-16PK, Osterode am Harz, Germany) at 10,000 rpm for 10 min [32]. After that, sodium selenite (Na2SeO3) was mixed with 15 mL of culture supernatant to obtain a final concentration of 3 mM, which was consequently incubated at 40 °C for 30 min until the formation of SeNPs. A change in the color of the culture supernatant from yellow to red confirmed the synthesis of SeNPs [33]. Finally, the biosynthesized SeNPs were centrifuged three times at 10,000 rpm for 10 min with double distilled water to purify them prior to being oven-dried at 60 °C for 48 h. A culture supernatant was used as a control under the same experimental conditions. The nanoparticles were kept in the refrigerator and re-dispersed with distilled water during use.

2.4. Characterization of the Myco-Synthesized SeNPs

A UV–Visible spectrophotometer, Zetasizer analyzer, X-ray diffraction instrument, transmission electron microscope (TEM), and Fourier transform infrared (FTIR) spectrophotometer were used to characterize the optical, morphological, structural, elemental, and functional characteristics of the synthesized SeNPs. The SeNPs absorbance was examined using a UV–visible spectrophotometer at wavelengths in the range of 400 to 800 nm (PerkinElmer Life and Analytical Sciences, CT, Ohio, USA). The average diameter size and distribution, as well as zeta potential charges, were determined by the particle size analyzer Dynamic Light Scattering (DLS) (Zetasizer Nano ZN, Malvern Panalytical Ltd., Malvern, UK) at a fixed angle of 173° at 25 °C. XRD was performed using a Bruker D8 DISCOVER Diffractometer, USA, with Cu-K radiation (λ = 1.54060 Angstrom) to determine the particles’ crystalline size. The relative intensity information was analyzed throughout a 2θ range of 5–100°. 2θ values and relative intensities (I/Io) were obtained from the chart, and core materials minerals were characterized using JCPDS carts. A high-resolution transmission electron microscope (HR-TEM; JEOL 2100, Japan) equipped with an electron diffraction pattern was also used to take transmission electron photographs. Fourier transform infrared spectroscopy was employed to investigate the elemental structure of SeNPs as well as the functional groups (FTIR; PerkinElmer, Ohio, USA). Triplicate samples were analyzed.

2.5. Investigation of Molluscicidal Activity of SeNPs

2.5.1. Snails

The snails, B. alexandrina (Ehrenberg, 1831) (8–10 mm in diameter), were acclimatized in the Medical Malacology Laboratory, Theodor Bilharz Research Institute (TBRI), Giza, Egypt. Snails were housed in plastic aquaria (16 × 23 × 9 cm) and fed with oven-dried lettuce leaves, blue-green algae (Nostoc muscorum), and tetramin. The following properties were used in the experiment: dechlorinated aerated tap water (10 snails/L), pH: 7 ± 0.2, and temperature (25 ± 2 °C) were covered with glass plates. Thirty mg/L of calcium carbonate was added to the water to achieve its optimum hardness for snail fecundity, shell length, and growth [34].

2.5.2. Molluscicidal Activity of SeNPs

A series of concentrations were prepared from the stock solution of SeNPs (95, 80, 65, 50, 35, and 25 mg/L) to calculate LC90 [35]. The snails (180) were subjected to a 96-h exposure period followed by a 24-h recovery period. Only dechlorinated water was used to keep the three control groups (30 snails) the same size. For each concentration, three replicates were used, each with ten snails. The mortality rate was measured and analyzed. [36].

2.5.3. Miracidicidal and Cercaricidal Activity

As a control group, 10 mL of dechlorinated tap water was added to 102 newly formed miracidia or cercariae. To assess the effect of biosynthesized SeNPs on the newly formed miracidia or cercariae, about 5 mL of LC10 (31.826 mg/L) and LC25 (44.15 mg/L) of biosynthesized SeNPs were added to 102 newly formed miracidia or cercariae found in 5 mL of water [37]. Using the dissecting microscope, the vitality of miracidiae and cercariae was scored after 15, 30, 45, 60, 120, 180, 240, 300, and 360 min [38].

2.6. Experimental Design

Ten snails in each aquarium were exposed to the sub-lethal concentrations of SeNPs at LC10 (31.82 mg/L) or LC25 (44.15 mg/L) for 96 h (exposure), followed by another 24 h of recovery, two weeks of repeating, followed by two weeks of recovery.

2.6.1. Hemolymph and Light Microscopy Preparation

The hemolymph was withdrawn from the heart using a capillary tube [39]. Part of the collected hemolymph was put on a glass slide, making a monolayer of hemocytes. Then the slides were dried in a moist chamber for 15 min at room temperature, followed by 5 min of dehydration in methanol, and finally stained for 20 min with 10% Giemsa stain (Aldrich) [40].

2.6.2. Comet Assay

After the exposure of B. alexandrina snails (8–10 mm) to SeNPs at concentrations of LC10 (31.28 mg/L) and LC25 (44.15 mg/L) for 96 h, the head feet of 10 snails from each group were cut and kept at −80 °C until they were needed. The single-cell gel assay was used to measure the comet assay for the detection of DNA breaks, as described by Grazeffe et al. [41] and Ibrahim and Sayed [42]. The slides were coded independently and scored independently.

2.6.3. Tissue Preparation

The soft tissues of the exposed and control groups were obtained by crushing the shells of the snails using two slides, weighing (1 g tissue/10 mL of phosphate buffer), and homogenizing with a glass Dounce homogenizer. Then, the tissue homogenates were centrifuged (Sigma, 3-16PK, Osterode am Harz, Germany) at 3000 rpm for 10 min, and the supernatants were stored at −80 °C until used.

Determination of Testosterone (T) and Estradiol (E2) Hormones Concentrations

The hormonal activity of T and E2 was estimated following the manufacturer’s instructions, in which T concentrations were measured using an EIA kit (Abia Testosterone, REF, DK. 040.01.3), while for E2 concentration, an immunoassay test kit (BioCheck, Inc., South San Francisco, CA94080, USA) was used [42].

Investigation of the Antioxidant Responses: Superoxide Dismutase (SOD); Glutathione S-Transferase (GST), Nitric Oxide (NO), Malondialdehyde (MDA), and Total Antioxidant Capacity (TAC)

For each group, biochemical changes in the tissue homogenate’s supernatant were monitored. Biodiagnostic kits (Biodiagnostic, Dokki, Giza, Egypt) were used to assess SOD [43]. In addition, cell MDA (lipid peroxide) was measured using the Ohkawa et al. [44] method, and GST was detected using the Beutler [45] method. TAC was determined with the kit (Cat. No. TA 2513) [46]. According to Bellos et al. [47], NO was estimated.

2.7. The Molecular Docking Study

The inhibitory potential of Na2SeO3 was investigated using two enzymes from the cellular anti-oxidant mechanism, SOD and GST. Three-dimensional crystals of human SOD 1 (PDB id: 5YTU) and SOD 2 (PDB id: 13GS) complexed with isoproterenol and sulfasalazine, respectively. These catalases were obtained from (www.rcsb.org/, 10 February 2022) in.pdb format. Na2SeO3 and reference inhibitors (isoproterenol (for SOD) and sulfasalazine (for GST) were selected. (www.pubchem.ncbi.nm.nih.gov/, 10 February 2022) was used for generating the 3D structures for ligands in .sdf format. MOE2015 is advanced computational modelling software for evaluating ligand → active site interactions. MOE 2015 conducted a docking experiment, which was used to correct errors in active sites during the structure preparation reaction. Hydrogens were added after the correction, and partial charges (AMBER12: EHT) were calculated. Energy minimization was carried out (AMBER12: EHT, root mean square gradient: 0.100). The MOE Site Finder program, which uses a geometric approach to calculate putative binding sites in a protein starting from its tridimensional structure, was used to find the receptor’s binding site. This method is based on alpha spheres, which are a generalization of convex hulls, rather than energy models. The binding sites predicted by the MOE Site Finder module in the holo-forms of the investigated proteins confirmed the binding sites defined by the co-crystallized ligands.

2.8. Statistical Analysis

The Probit facility analyzed the median lethal and lethal concentration values [48]. The mean values of the experimental and control groups were compared using the Student’s t-test [49]. The data was analyzed using the statistical software SPSS version 20 for Windows (SPSS, Inc., Chicago, IL, USA). The results were expressed as the average value ± S.E.

3. Results

3.1. Molecular Identification of the Fungal Strain

The ITS sequences of the fungal isolate’s rDNA were aligned with strains from GenBank that were genetically related. It demonstrated 99–100% identity and 100% coverage with several Penicillium chrysogenum strains, including the type strain CBS 306.48 (GB no.: NR 077145). The sequence was registered in the GenBank database under the accession number MZ945518 (Figure 1).

3.2. The Myco-Synthesis of SeNPs by P. chrysogenum

After 30 min of incubation, the color of the culture medium changed from yellow to brick-red after the culture filtrate was treated with 1 mM Na2SeO3 (Figure 2). Following incubation, the presence of a red-brick color inside the culture medium was clear evidence that the extracellular metabolites rapidly reduced selenite ions to the elemental Se (Se0) form [33]. The SeNPs’ productivity was calculated to be around 38 mg/100 mL.

3.3. Characterization of the Myco-Synthesized SeNPs

UV–Visible spectrophotometry was used to monitor the SeNPs production in the culture filtrate, revealing a strong and broad surface plasmon resonance (SPR) peak at 521 nm, which is an SeNPs feature (Figure 2). In the control, however, no absorption peak corresponding to the SeNPs was found.
The synthesis of polydispersed spherical SeNPs with diameter sizes ranging from 44 to 78 nm was revealed by TEM analysis of a colloidal solution of myco-synthesized SeNPs (Figure 3a). Figure 3b shows the average size distribution in the SeNP solution as determined by DLS. According to the results obtained, the myco-synthesized SeNPs were measured to have an average diameter of 207 nm. DLS determines the size of SeNPs, which is influenced by biomolecules coated on their surfaces as stabilizers as well as their metallic cores. The stability of SeNPs was assessed using the zeta potential assessment of particle surface charge, which revealed a mean zeta potential of −32.4 mV (Figure 3c).
The XRD results revealed a broad pattern with no clear Bragg peaks. While there were no significant peaks, smaller peaks at 2Ѳ values were found at 12.658°, 19.146°, 20.712°, 21.011°, 25.352°, 29.402°, 31.830°, 53.938°, 55.218°, 58.039°, and 61.540°. The results demonstrated that myco-synthesized SeNPs are rather more amorphous than crystalline (Figure 4).
The presence of various functional groups in metabolites that are responsible for SeNP myco-synthesis, capping, and stabilization was determined using FTIR measurements. The FTIR for the culture supernatant of P. chrysogenum was analyzed and showed five intense peaks observed at 3307.57, 2107.89, 1635.22, 431.08, and 407.76 cm−1 (Figure 5a). These peaks were shifted to eight peaks in the chart of SeNPs. The interaction of metabolites with SeNPs is illustrated by wavenumbers at 3307.05, 2114.39, 1635.50, 451.03, 442.54, 429.87, 419.61, and 403.05 cm−1 (Figure 5b).

3.4. Effects of Selenium Nanoparticles against B. alexandrina Snails

The present findings revealed that SeNPs have a molluscicidal effect against adult B. alexandrina snails after 96 h of exposure at LC50 5.96 mg/L (Table 1 and Figure 6).
The current results showed that SeNPs have a toxic effect on S. mansoni stages, as shown in Figure 7. All miracidae exposed to SeNPs died after 60 min, compared to only 20% of the deaths in the control group (Figure 7A), while 45 min was enough to kill all exposed cercariae, compared to 10% of the control group.
The examination of hemocyte monolayers by light microscope showed the presence of three cell types of hemocytes in the control group: small hemocytes, hyalin oocytes, and granulocytes (Figure 8A). Hemocytes of exposed B. alexandrina snails suffered from many changes. The exposure to LC10 (31.826 mg/L) of SeNPs showed numerous granules and newly formed pseudopodia in the granulocytes, while hyalinocytes suffered from incomplete cell division where the nucleus divided, forming two nuclei without cell membrane separation (Figure 8B). The exposure to LC25 (44.15 mg/L) of SeNPs resulted in increased observed granules with an irregular cell membrane in granulocytes, while newly small pseudopodia were seen in hyalinocytes (Figure 8C).
The current study found that after the exposure to sublethal concentrations of SeNPs, there were DNA breaks where the percentage of the comet, tail length, percent DNA in tail, and tail moment were increased (p< 0.05 and 0.01) compared to control snails (Table 2 and Figure 9).
The current findings revealed that testosterone (T) and estradiol (E2) levels were significantly higher (p < 0.05) after exposure to sublethal concentrations when compared to the control group (Table 3).
Significant increases in a concentration-dependent manner (p < 0.05) of MDA, NO, and GST were noticed after in vivo exposure of B. alexandrina snails to sub-lethal concentrations of SeNPs. On the other hand, SOD activity was significantly decreased (p < 0.05) while TAC was insignificantly decreased (Table 4).

3.5. Molecular Docking Study

The two enzymes, SOD and GST, were selected for the cellular antioxidant mechanism to determine the inhibitory potential of sodium selenite. Three-dimensional structures of human SOD 1 complexed with isoproterenol (PDB id: 5YTU) and human GST complexed with sulfasalazine (PDB id: 13GS) were used for molecular docking. The tested compound revealed high efficiency against the respective receptor binding sites of SOD and GST (Figure 10). The molecular docking showed that Na2SeO3 succeeded in binding to similar active sites in the same spot as the original inhibitor, which suggests that Na2SeO3 blocks the receptors in the same way.
The inhibition activities for the enzymes were examined using interaction-free energy, which is known as the docking score. Na2SeO3 showed promising docking and H-interaction scores (−5.03 and −4.70 Kcal/mol), respectively, against SOD and GST, and its compound displayed promising scores (Table 5).

4. Discussion

The application of green synthesis nanoparticles for freshwater snail control is novel. In this approach, natural metabolites extracted from plants and microorganisms are used to synthesize nanoparticles. Natural molecules are thought to produce safer nanoparticles than the more toxic chemical polymers used in the fabrication process [50]. The activity of metabolites released by various organisms, including plants, fungi, actinomycetes, bacteria, and algae, were exploited in metal ion reduction, capping, and stability for the biosynthesis of metal nanoparticles [18]. In the current study, the reducing capacity of the culture filtrate metabolites of P. chrysogenum was used to synthesize SeNPs. P. chrysogenum is capable of producing a diverse spectrum of secondary biomolecules that work as a biocatalyst to reduce and stabilize nanoparticles. Proteins, several enzymes, and carbohydrates are some of these molecules [10,51]. Joshi et al. [52] observed that the fungal strain’s ability to reduce Se ion and synthesize SeNPs is due to the numerous extracellular proteins and enzymes. Amin et al. [31] reported that Penicillium chrysogenum F9 was employed as a biocatalyst for SeNPs biosynthesis. The resultant color shifting was caused by the surface plasmon resonance of monoclinic Se particles [53]. The production of SeNPs in culture filtrate was measured using UV–Visible spectroscopy, which revealed a strong and broad peak at 521 nm. It was reported that the absorbance values of SeNPs were determined at 300 nm and another value at 540 nm [54,55]. SeNPs displayed absorbance at approximately 520 nm due to Mie scattering [56]. Ullah et al. [57] stated that the maximum absorption peak of selenium nanoparticles synthesized by Bacillus subtilis BSN313 was at 650 nm. The current findings were consistent with those of Ranjitha and Ravishankar [58], who indicated that selenium nanoparticles synthesized by Streptomyces griseoruber had a maximum peak at 575 nm. The sizes determined by TEM (44 to 78 nm) and DLS (207 nm) differed because DLS examines the hydrodynamic quantity while TEM examines the solid core [59]. The negative charge of particles indicates the electrostatic stability of the synthesized nanoparticles as reported by [32]. The electrostatic stability of the synthesized colloidal nanoparticle solution is indicated by a zeta potential greater than +30 mV or less than −30 mV [60]. The XRD results revealed that the myco-synthesized SeNPs are rather more amorphous than crystalline. This amorphous nature is consistent with previous research with lycopene [61], Pseudomonas stutzeri [62], and Withania somnifera [63]. FTIR analysis revealed the interaction between P. chrysogenum metabolites and SeNPs. The signal band at 3307.05 cm−1 corresponds to N–H, C–H, and O–H stretching vibrations, suggesting the presence of primary amine in the fungal proteins [31], alkyne, and alcohol, respectively [64]. This demonstrates the importance of N–H-containing proteins in the reduction of Se ions and the formation of SeNPs. The band at 2114.39 cm−1 corresponds to the presence of alkyne. Furthermore, the peak at 1635.50 cm−1 was associated with various peptide linkage and polysaccharide ring moieties such as N-H, C=N, C=O, and C=C [33]. The bands at 451.03, 442.54, 429.87, 419.61, and 403.05 cm−1 revealed the binding of SeNPs with the metabolites of P. chrysogenum culture filtrate. According to these results, many functional groups of organic compounds, such as proteins and polysaccharides, present in the culture filtrate of P. chrysogenum are involved in the capping, stability, and reduction of SeNPs.
The present study revealed that SeNPs have molluscicidal activity against B. alexandrina after 96 h of exposure. These findings are consistent with those of Osman et al. [65], who observed that B. alexandrina snails treated with Aspergillus fumigatus fungal extract showed a high molluscicidal effect. In addition, Abdel-Hamid and Mekawey [65] reported that the myco-biosynthesis of silver nanoparticles (AgNps) from the two fungi, Paecilomyces variotii and Aspergillus niger, has molluscicidal activity against B. alexandrina snails.
Moreover, the current research found that SeNPs had miracidicidal and cercaricidal properties. Many similar studies have revealed the effective role of SeNPs against many other parasitic species. Mahmoudvand et al. [66] showed that Se NPs could kill promastigote and amastigote stages of Leishmania major. Similarly, Alkhudhayri et al. [67] found that Se NPs have anti-coccidial, anti-apoptotic, and anti-inflammatory effects against the Eimeria parasite in the jejunum of mice. Furthermore, Se nanoparticles showed promising protective roles against mice infected with Schistosoma mansoni [68]. Comparing the Se nanoparticles’ activity against meracidia and cercariae, the present results showed a faster mortality rate of cercariae than the meracidial rate. Unlike the present study, Osman et al. [65] showed that the fungal extract of Aspergillus fumigatus caused a higher mortality rate of miracidia than that of cercariae after exposure to the same experimental period. The mortality rates of both larval stages appear to differ depending on their biological nature and their internal structure [69].
One of the most sensitive tools to detect DNA defects is the comet assay, which detects DNA single-strand breaks [70]. The present results of the comet assay revealed that SeNPs induced DNA damage in B. alexandrina. Similarly, Ali [71] found that TiO2NP induced DNA damage in the freshwater snail Lymnea leuteola. Moreover, the author reasoned that these DNA breaks might be related to the oxidative stress that might be generated after the treatment. In good accordance with the present results, Ibrahim and Ghoname [72] found that exposure of B. alexandrina snails to the leaves of Anagalis arvensis aqueous extracts caused DNA breaks revealed by the comet assay. Inline supporting these results, Wang et al. [73] named the process of metal oxide NP transport ions onto the cells as “Trojan-horse type carriers”, causing serious damage of metal oxide NPs affecting the DNA molecules.
In gastropods, hemocytes, found in the hemolymph, represent the main component of the immune response [74]. According to their morphology, Cavalcanti et al. [75] reported three different types of haemocytes in B. alexandrina; spherical, small (undifferentiated), hyalinocytes, and granulocytes. The current study revealed that after exposure to LC10 (31.82 mgL−1) of SeNPs, the granulocytes showed pseudopodia and hyalinocytes had incomplete cell division, At exposure to 44.15 mg/L, some granulocytes formed many granules with an irregular cell membrane, and some hyalinocytes formed pseudopodia. These results are similar to those obtained by Abdel-Hamid and Mekawey [76], who found that hemocytes of treated B. alexandrina with LC25 of both P. variotii and A. niger AgNPs showed many alterations in their morphology, such as apoptotic hemolymph cells and fragmented, vacuolated, and degenerated cytoplasm. In agreement with the current study, Ibrahim et al. [77] exposed B. alexandrina to butralin, glyphosate isopropyl ammonium, or pendimethalin herbicides, and they observed that many granules and pseudopodia were produced by granulocytes while the hyalinocytes revealed a shrunken nucleus. Ray et al. [78] reported that hemocytes are the main immune cells working by phagocyting foreign particles in Mollusca species. Donaghy et al. [79] suggested that the observed pseudopodia of granulocytes may be a method of phagocytosis used to eliminate these foreign particles.
In the current study, the exposure of B. alexandrina to SeNPs induced oxidative stress that was noticed in the high levels of MDA in a concentration-dependent manner. Ohkawa et al. [44] reported that MDA is the most catastrophic effect of ROS, which is formed by the peroxidation of lipid membranes. Like the current study, Khalil [80] reported that MDA was significantly increased in the snail Lanistes carinatus after exposure to chlorpyrifos. These findings are similar to those of Ibrahim and Sayed [42], who found that malondialdehyde (MDA) increased in a concentration-dependent manner after the treatment of B. alexandrina snails with sub-lethal doses of oxyfluorfen herbicide (LC0, LC10, or LC25).
The antioxidant enzymes SOD and GST have a pivotal role in the elimination of ROS and modulate the response of living organisms to oxidative conditions. GST levels increased significantly after LC25 exposure, whereas SOD levels decreased significantly after LC10 and LC25 exposure. These results are consistent with the observations obtained by Khalil [80], who found that the GST activity was significantly increased in the adult freshwater snail L. carinatus when treated with chlorpyrifos. Similarly, the levels of SOD decreased in the snail B. alexandrina after treatment with atrazine and Roundup [81]. In contrast, Ibrahim and Sayed [42] found that the activity of SOD increased after the exposure of B. alexandrina to sub-lethal concentrations of oxyfluorfen herbicide. The unexpected suppression of SOD might result from protein degradation through oxidative damage to SOD or gene expression modifications [82]. One of the most effective innate immune defence mechanisms is the production of nitric oxide, which leads to the cytotoxicity of the invading pathogens in mollusks [78]. In the present study, the NO concentration significantly increased after the exposure to sublethal LC10 and LC25 of SeNPs. These results are in agreement with the findings of Wang et al. [83] who reported that the exposure of snail B. straminea to pyridyl phenyl urea derivatives led to high activity of NO. Also, Saleh et al. [84] found increasing NO activity after the treatment of B. alexandrina with the veterinary antibiotics oxytetracycline and trimethoprim-sulphadiazine.
The molecular docking method for examining receptor-ligand interactions is an important tool for predicting the inhibition actions of the enzymes associated with antioxidant activity. MOE 2016 [85] was used to perform the docking experiment. The enzymatic components include (SOD; PDB id: 5YTU [86]) and (GST; PDB id: 13GS [87]), the most potent non-enzymatic cellular antioxidant that is used by GST and GPx to neutralize oxidants [88]. SOD catalyzes the transformation of (O2.−) → (H2O2), which is responsible for reducing the RONS levels [89]. The docking study aimed to determine the potential of Na2SeO3 in altering the cellular antioxidant defence system using molecular modeling. The observed results suggested the inhibition potency of Na2SeO3 against SOD and GST by interfering with their active important amino acids for catalytic sites.
The physiological and genotoxicological properties of Biomphalaria alexandrina snails were negatively impacted by myco-synthesized SeNPs. However, more research should be conducted to determine their effects on freshwater zooplanktonic species, such as the water flea Daphnia magna, which is used as a non-target organism for toxicity assessment in aquatic ecosystems found in the same habitat as B. alexandrina [90].

5. Conclusions

Myco-synthesized SeNPs have molluscicidal activity against the snail Biomphalaria alexandrina and larvicidal activity against Schistosoma mansoni larval stages, which could lead to a decrease in the spread of schistosomiasis. Further studies, including the effects on other (non-target) organisms and sub-lethal effects on snail fecundity/and fertility, are needed to determine whether the myco-synthesized SeNPs can be used as a promising tool for biological control and to replace the toxic synthetic chemical molluscicides.

Author Contributions

Conceptualization, M.Y.M., H.E.-S. and A.M.I.; methodology, M.Y.M., H.E.-S. and A.M.I.; software, M.Y.M., H.E.-S., A.S.A. and A.M.I.; validation, M.Y.M., H.E.-S. and A.M.I.; formal analysis, S.M.K. and A.S.A.; investigation, M.Y.M., H.E.-S. and A.M.I.; resources, M.Y.M., H.E.-S., A.A.E. and A.M.I.; data curation, S.M.K. and A.S.A.; writing—original draft preparation, M.Y.M., H.E.-S. and A.M.I.; writing—review and editing, M.Y.M., H.E.-S. and A.M.I. All authors have read and agreed to the published version of the manuscript.

Funding

Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2022R214), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

All data generated or analyzed during this study are included in this article.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Phylogenetic tree of the fungal isolate depending on ITS sequence (GenBank accession no. MZ945518, arrowed) aligned with closely similar strains in the GenBank. (P. = Penicillium). The sequences were phylogenetically analyzed utilizing MegAlign (DNA Star) software version 5.05.
Figure 1. Phylogenetic tree of the fungal isolate depending on ITS sequence (GenBank accession no. MZ945518, arrowed) aligned with closely similar strains in the GenBank. (P. = Penicillium). The sequences were phylogenetically analyzed utilizing MegAlign (DNA Star) software version 5.05.
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Figure 2. UV–Visible absorption spectrum and brick-red color of the myco-synthesized selenium nanoparticle.
Figure 2. UV–Visible absorption spectrum and brick-red color of the myco-synthesized selenium nanoparticle.
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Figure 3. Morphological characterization of myco-synthesized SeNPs (a) TEM photographs of myco-synthesized selenium nano-selenium using P. chrysogenum culture filtrate at the scale of 100 nm and 200 nm, (b) size distribution pattern, and (c) zeta potential distribution.
Figure 3. Morphological characterization of myco-synthesized SeNPs (a) TEM photographs of myco-synthesized selenium nano-selenium using P. chrysogenum culture filtrate at the scale of 100 nm and 200 nm, (b) size distribution pattern, and (c) zeta potential distribution.
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Figure 4. XRD spectrum of myco-synthesized selenium nanospheres.
Figure 4. XRD spectrum of myco-synthesized selenium nanospheres.
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Figure 5. FTIR pattern (a) culture supernatant, and (b) myco-synthesized selenium nanoparticles, where Y-axis represented the transmission (%T) and X-axis represented the wavenumber (cm−1).
Figure 5. FTIR pattern (a) culture supernatant, and (b) myco-synthesized selenium nanoparticles, where Y-axis represented the transmission (%T) and X-axis represented the wavenumber (cm−1).
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Figure 6. Molluscicidal effect of SeNPs against B. alexandrina snails as shown in probit analysis.
Figure 6. Molluscicidal effect of SeNPs against B. alexandrina snails as shown in probit analysis.
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Figure 7. The miracidicidal (A) and cercaricidal (B) activities of SeNPs.
Figure 7. The miracidicidal (A) and cercaricidal (B) activities of SeNPs.
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Figure 8. Photomicrographs (×40) of different types of hemocytes.(A) hemocytes of control group of adult B. alexandrina snails, (B) B. alexandrina snails hemocytes after exposure to LC10 of SeNPs (31.826 mg/L), (C) hemocytes of adult B. alexandrina snails after exposure to LC25 of SeNPs (44.15 mg/L). Abbreviations, G: granulocyte, GR: granules, H: hyalinocyte, N: nucleus, PS: pseudopodia, S: small round.
Figure 8. Photomicrographs (×40) of different types of hemocytes.(A) hemocytes of control group of adult B. alexandrina snails, (B) B. alexandrina snails hemocytes after exposure to LC10 of SeNPs (31.826 mg/L), (C) hemocytes of adult B. alexandrina snails after exposure to LC25 of SeNPs (44.15 mg/L). Abbreviations, G: granulocyte, GR: granules, H: hyalinocyte, N: nucleus, PS: pseudopodia, S: small round.
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Figure 9. Ranks of comet according to the percent of DNA in the tail. (A) Control group, (B) B. alexandrina snails after exposure to LC10 of SeNPs (31.826 mg/L), (C) adult B. alexandrina snails after exposure to LC25 of SeNPs (44.15 mg/L).
Figure 9. Ranks of comet according to the percent of DNA in the tail. (A) Control group, (B) B. alexandrina snails after exposure to LC10 of SeNPs (31.826 mg/L), (C) adult B. alexandrina snails after exposure to LC25 of SeNPs (44.15 mg/L).
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Figure 10. 2D and 3D docked interaction map for the Na2SeO3 compounds into the active site of SOD and GST.
Figure 10. 2D and 3D docked interaction map for the Na2SeO3 compounds into the active site of SOD and GST.
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Table
Table 1. Myco-synthesized SeNPs’ molluscicidal activity against B. alexandrina snails after 96 h of exposure.
Table 1. Myco-synthesized SeNPs’ molluscicidal activity against B. alexandrina snails after 96 h of exposure.
Lethal Concentration DosesLC10LC25LC50LC90Slope
Concentration (mg/L)31.82644.1557.8583.871.4
Table
Table 2. DNA breaks after SeNPs exposure to B. alexandrina snails.
Table 2. DNA breaks after SeNPs exposure to B. alexandrina snails.
Comet %Tail Length (px)% DNA in TailTail Moment
Control14.958.15 ± 0.4223.79 ± 3.751.955 ± 0.402
LC1015.8510.507 ± 0.54 *33.66 ± 1.43 *3.529 ± 0.03 *
LC2519.511.96 ± 1.37 *33.588 ± 5.7 *4.094 ± 1.15 *
1 px = 0.24 µm; * = significant compared to control at p < 0.05.
Table
Table 3. SeNP exposure effects on (T) and (E2) concentration of B. alexandrina snails.
Table 3. SeNP exposure effects on (T) and (E2) concentration of B. alexandrina snails.
GroupsTestosterone (nmol/L)Estradiol (pg/mL)
Control20 ± 0.52100 ± 3.1
LC1030 ± 0.71 *300 ± 5.2 *
LC2535 ± 0.56 *1000 ± 4.6 *
* = significant compared to control at p < 0.05.
Table
Table 4. Effects of SeNP exposure on some biochemical parameters of B. alexandrina snails.
Table 4. Effects of SeNP exposure on some biochemical parameters of B. alexandrina snails.
Biochemical Parameters MDA
(nmol/g.tissue)		NO
(µmol/L)		SOD
(U/g.tissue)		GST
(U/g.tissue)		TAC
(mM/L)
Control 9.811 ± 0.012136.75 ± 0.428.36 ± 0.10.85 ± 0.051.505 ± 0.4
LC1010.612 ± 0.4 *148 ± 0.34 *5.045 ± 0.02 *0.927 ± 0.11.488 ± 0.21
LC2514.47 ± 0.3 *322 ± 0.21 *3.624 ± 0.2 *1.0545 ± 0.03 *1.375 ± 0.3
* = significant compared to control at p < 0.05.
Table
Table 5. The docking energy scores (kcal/mol) for Na2SeO3.
Table 5. The docking energy scores (kcal/mol) for Na2SeO3.
ΔGrmsdE.vdwE.IntE.H.B.Eele
5YTU−5.033.86−266.94−1.86−11.10−27.82
13GS−4.701.53−266.52−2.18−10.09−27.31
ΔG: The ligand’s free binding energy from a given conformer, E.Int.: affinity binding energy of hydrogen bond interaction with the receptor; E.H.B.: hydrogen bonding energy between protein and ligand; Eele: electrostatic interaction with the receptor; Evdw: Van der Waals energies between the ligand and the receptor.
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Morad, M.Y.; El-Sayed, H.; Elhenawy, A.A.; Korany, S.M.; Aloufi, A.S.; Ibrahim, A.M. Myco-Synthesized Molluscicidal and Larvicidal Selenium Nanoparticles: A New Strategy to Control Biomphalaria alexandrina Snails and Larvae of Schistosoma mansoni with an In Silico Study on Induced Oxidative Stress. J. Fungi 2022, 8, 262. https://doi.org/10.3390/jof8030262

AMA Style

Morad MY, El-Sayed H, Elhenawy AA, Korany SM, Aloufi AS, Ibrahim AM. Myco-Synthesized Molluscicidal and Larvicidal Selenium Nanoparticles: A New Strategy to Control Biomphalaria alexandrina Snails and Larvae of Schistosoma mansoni with an In Silico Study on Induced Oxidative Stress. Journal of Fungi. 2022; 8(3):262. https://doi.org/10.3390/jof8030262

Chicago/Turabian Style

Morad, Mostafa Y., Heba El-Sayed, Ahmed A. Elhenawy, Shereen M. Korany, Abeer S. Aloufi, and Amina M. Ibrahim. 2022. "Myco-Synthesized Molluscicidal and Larvicidal Selenium Nanoparticles: A New Strategy to Control Biomphalaria alexandrina Snails and Larvae of Schistosoma mansoni with an In Silico Study on Induced Oxidative Stress" Journal of Fungi 8, no. 3: 262. https://doi.org/10.3390/jof8030262

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