Toxicological Evaluation and <i>In Silico</i> Identification of Acetylcholinesterase Inhibitors in a Commercial Polyherbal Formulation <i>(KWAPF01)</i>

Aladodo, A. Raliat; Ibrahim, Ibrahim O.; Sabiu, Saheed

doi:https://doi.org/10.1155/2022/4388941

Evidence-Based Complementary and Alternative Medicine

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Abstract Introduction Materials and Methods Results Discussion Conclusion Data Availability Conflicts of Interest Acknowledgments Supplementary Materials References Copyright Related Articles

Research Article | Open Access

Volume 2022 | Article ID 4388941 | https://doi.org/10.1155/2022/4388941

Toxicological Evaluation and In Silico Identification of Acetylcholinesterase Inhibitors in a Commercial Polyherbal Formulation (KWAPF01)

A. Raliat Aladodo,¹Ibrahim O. Ibrahim,¹and Saheed Sabiu²

Academic Editor: Robson Xavier Faria

Received12 Apr 2022

Revised08 Jun 2022

Accepted18 Jun 2022

Published15 Jul 2022

Abstract

This study investigated the toxicological implications of a commercial polyherbal formulation, KWAPF01. Twenty-four Wistar rats were randomized into six groups of four animals per group. The animals in Group 1 were administered placebo and designated as control, while the rats in Groups 2 to 6 were administered 1000, 1500, 2000, 2500, and 3000 mg/kg bodyweight single oral dose of KWAPF01, respectively, and subsequently monitored for gross morphological and behavioural changes for 72 h. Piloerection, reduced motility, and tremor were observed in experimental groups, and the median lethal dose (LD₅₀) of the extract was 2225.94 mg/kg bodyweight. The 11 compounds identified through HPLC analysis of the extract were docked against acetylcholinesterase (AChE), and the docking scores ranged from −5.3 to −10.8 kcal/mol, with catechol (−5.3 kcal/mol) and berberine (−10.8 kcal/mol) having the highest and lowest binding energies, respectively. Judging by the results, it could be inferred that some of the constituents of KWAPF01 have a direct impact on the nervous system and this is possibly elicited via the cholinergic system as it contains a nicotinic acetylcholine receptors agonist and potential inhibitors of AChE. Therefore, the use of KWAPF01 needs to be cautiously guided.

1. Introduction

Traditional medicine is a diverse health practice involving the use of plants, animals, spiritual therapies, and manual techniques used singularly or in combination to maintain good health status as well as to treat, diagnose, or prevent illness [1]. Since antiquity, herbal medicines, an integral part of traditional medicines, have been used in the treatment of diseases [2] and remain an important part of the global healthcare delivery systems, especially in Africa and some Asian countries [3, 4]. The upsurge in the trend of herbal medicine usage as curative medicine is partly related to its cultural acceptability coupled with being relatively more affordable and easily accessible than conventional medicine [5]. Plant materials (roots, leaf, seed, bark, flowers, etc.) have been reported to be used to treat and manage several diseases such as diabetes [6, 7], hypertension [8], and cataracts [9]. Furthermore, several drugs used in conventional medicine were originally derived from plants. For example, salicylic acid, a precursor of aspirin, was first derived from Salix alba (white willow) tree bark [10]. Similarly, artemisinin is an antimalarial drug derived from Artemisia annua (sweet wormwood), a prominent herb in Chinese traditional medicine [11].

Of recent, however, the increased demand and usage of herbal medicines coupled with reported cases of adverse reactions, especially when used singly, or concurrently with orthodox medicines have raised concerns and fears over the quality, efficacy, and safety of such products [12]. While the components of herbal formulations that may elicit toxic effects could exist as natural components of plants, they may also arise from contaminants acquired during preparation and storage. Also, the indiscriminate, irresponsible, or nonregulated use of herbal medicines may put the health of the users at risk of toxicity. Other factors such as herb-drug interactions, herb-herb interactions, lack of adherence to good manufacturing practices, poor regulatory measures, and adulteration may also lead to adverse reactions [13]. These adverse reactions may manifest as neurotoxicity, hepatotoxicity, nephropathy, cardiomyopathy etc. For example, Teucrium chamaedrys, commonly referred to as germander, may cause hepatitis and even liver cirrhosis [14]. Therefore, there is a need for a proper and comprehensive toxicological evaluation of herbal medicine before consumption.

KWAPF01 is a deep brown commercial herbal medicine that is commonly used in Kwara State, Nigeria. It is acclaimed to be effective against hypertension, rheumatoid arthritis, gonorrhoea, and convulsion. Its label indicates that it is made from ginger as well as leaves and roots without explicitly, stating the plants from which they were obtained. It is contraindicated in pregnancy, and the exact duration of use and probable side effects are not known. However, due to the acclaimed therapeutic effects, it has received good patronage over the years, particularly in the southwestern region of Nigeria. However, some of its consumers have reported some adverse reactions with symptoms resembling perturbation of the nervous system such as dizziness, tachycardia, and perspiration. Unfortunately, there is currently no scientific data/information substantiating both the therapeutic and toxicity profile of KWAPF01. It is on this background that the present study was conceptualized and undertaken to evaluate the safety profile of KWAPF01 using computational and in vivo experimental models.

Through this research, we intend to bridge the existing research gap on KWAPF01 by investigating if it is toxic and determining the constituents responsible for its toxicity. No scientific report has been published concerning these. The aim of the research was achieved by identifying the bioactive components of the formulation, studying the changes in experimental animals following its administration, establishing its median lethal dose in rats, and studying its effects on the nervous system.

2. Materials and Methods

2.1. Chemicals

Acetonitrile and ethanol were procured from Sigma-Aldrich (St. Louis, MO, USA). Distilled water was obtained from the Department of Chemistry, Faculty of Pure and Applied Sciences, Kwara State University, Malete, Nigeria. Other chemicals and reagents used were of analytical grade.

2.2. Herbal Medicine

Fifteen 50 ml bottles of KWAPF01 used in this study were purchased from a medicine store in Ilorin, Kwara State, Nigeria. Before administration, 500 ml of KWAPF01 was filtered (Whatman No.1 filter paper) and the filtrate was freeze-dried at −54°C and 0.45 mbar.

2.3. HPLC Analysis

HPLC analysis was conducted as described by Irondi et al. [8] with some modifications. The HPLC system equipped with a binary solvent delivery module and a diode array detector was used in identifying the secondary metabolites of KWAPF01. The extract (10 g) was dissolved in 20 ml of acetonitrile/methanol (50 : 50) solvent, and after 30 minutes, the solution was transferred into a 25 ml standard flask and made up to 25 ml using the same solvent and then filtered. Exactly 10 μl of the prepared sample was injected into Shimadzu’s Nexera MX HPLC system at a controlled flow rate of 1 ml/min. Linear gradient elution was employed using methanol/water (70 : 30) as the mobile phase. Identification of secondary metabolites was performed based on the retention times and the spectra characteristics of peaks with those of reference standards.

2.4. In silico Evaluation

2.4.1. Acquisition and Preparation of Ligands and Receptors

The X-ray crystal structure of Mus musculus AChE (PDB ID: 4B83, resolution: 2.40 Å) [15] was retrieved from the Protein Data Bank (https://www.rcsb.org/). The B3V (N-[2-(diethylamino)ethyl]-3-methoxy-benzenesulfonamide) ligand at the enzyme active sites was saved in the pdb format using untransformed coordinates, while the B chain of the homodimer protein alongside all nonstandard residues in chain A of the receptor was deleted. Loop modelling was conducted to position the missing amino acid residues using modeller v9.25 [16], and the resulting structure was subjected to energy minimization using UCSF Chimera V1.15. Dock Prep tools were used to generate pdbqt files with hydrogen and charges added. On the other hand, the 3D structures of the HPLC-identified compounds and donepezil (a standard AChE inhibitor) were downloaded in simple data format (SDF) from PubChem (https://pubchem.ncbi.nlm.nih.gov). The compounds including the co-crystallized B3V ligand were subsequently optimized in Open Babel algorithm v3.1.1 for energy minimization using MMFF94 force field coupled with the addition of hydrogen atoms. The optimized SDF files were converted to pdbqt format using command lines, specifying Gasteiger charge and pH 7.4 options [17].

2.4.2. Docking Protocol Validation

The prepared B3V ligand, in pdbqt format, was redocked using a grid box with centred at 30.22 Å × 23.87 Å × 12.71 Å and a size of 29.21 Å × 30.00 Å × 25.59 Å for x, y, and z coordinates, respectively. The root mean square deviation (RMSD) was used to assess how close the docking protocol could reproduce the crystallographic binding pose, and this was calculated using AutoDock tools. On superimposing the co-crystallized ligand pose on the predicted pose with the lowest binding energy (−7.4 kcal/mol), the RMSD was found to be 2.042 Å value within the acceptable range of <3.0 Å [18].

2.4.3. Molecular Docking

Molecular docking was done as earlier described by Trott and Olson [19] with some modifications. Alongside a standard drug (donepezil), all KWAPF01 ligands pdbqt were docked against the prepared Mus musculus AChE pdbqt structure using AutoDock Vina 1.1.2. The docking parameters were provided in a configuration file. The specified grid box centred at 30.22 Å × 23.87 Å × 12.71 Å, and the box size was 29.21 Å × 30.00 Å × 25.59 Å for x, y, and z coordinates, respectively. Energy range, exhaustiveness, and number of modes were specified to be 3, 8, and 10 kcal/mol, respectively. AutoDock Vina results were visualized using the ViewDock tool in Chimera, and ligand-receptor pdb of poses with the lowest binding energy were generated. Interactions were visualized using Discovery Studio v20.1.0.19295.

2.4.4. Pharmacodynamic and Pharmacokinetic Profiling

The KWAPF01 secondary metabolites were acquired in the simplified molecular input line entry system (SMILES) format. The SMILES notations were compiled, labelled using the MarvinSketch program, and then submitted to the SwissADME server (https://www.swissadme.ch/) to predict some of their possible pharmacodynamic and pharmacokinetic properties [20]. The data generated were exported in comma-separated value (CSV) format, and the BOILED-Egg diagram was also retrieved.

2.5. In Vivo Experimentation

2.5.1. Experimental Animals and Protocol

The 24 Wistar rats (180 ± 20 g) used in this study were obtained from the Animal Holding Unit of the Department of Biochemistry, Faculty of Life Sciences, University of Ilorin, Ilorin, Nigeria. They were acclimatized to the animal housing conditions (temperature, 25–30°C; 12 hours light/12 hours dark cycle; 40–45% relative humidity) for 7 days and had ad libitum access to rat pellets (Top Feeds, Nigeria) and tap water. The research adhered to the Principles of the National Research Council Guide [21] and the National Institute of Health for the Care and Use of Laboratory Animals [22].

2.5.2. Acute Toxicity Evaluation

The acute toxicity evaluation was done following the method described by Eniojukan and Aina [23] with some modifications. To minimize animal use, the sample size was determined using the “resource equation” method [24]. The 24 rats were randomized into six groups of four rats each. Rats in Group 1 designated as control received 1 ml of distilled water, while animals in Groups 2 to 6 were administered 1 ml each of a single oral dose of KWAPF01 at 1000, 1500, 2000, 2500, and 3000 mg/kg bodyweight, respectively. After administration, the animals were monitored for gross morphological and behavioural changes, including locomotor activity, piloerection, ptosis, lacrimation, aggressiveness, convulsion, drowsiness, urination, defecation, and mortality through direct observation as described by Eniojukan and Aina [23]. These observations were made for the first 30 minutes after dosing and periodically during the first 24 h with special attention during the first 4 h and daily thereafter for 3 days. The median lethal dose (LD₅₀) was thereafter determined using probit analysis, and the 95% confidence interval was constructed [25]. The mortality data obtained post-72-h treatment was analysed using STATA 16 statistical package, and the generalized linear model analysis was conducted. The number of responses per group (deaths) was used as the response variable, while the log of the dose was used as the explanatory variable. The LD₅₀ was then calculated from the fitted model, and the confidence interval was constructed using IBM SPSS, version 21. Based on the LD₅₀ value obtained, the test substance was ranked on the Hodge and Sterner toxicity scale [26].

3. Results

3.1. Phytochemical Analysis and HPLC Profiling

The quantitative phytochemical analysis of the herbal formulation revealed the presence of phenolics, triterpenoids, flavonoids, and alkaloids (Supplementary Table S1). A further probe into its exact constituents through HPLC analysis showed distinct peaks corresponding to 11 compounds (Figure 1 and Table 1). Relative to other identified metabolites, nicotine was the most abundant component of the formulation (41.21%) followed by arjungenin (16.47%) and chrysin (15.22%), while the less abundant metabolites were 11-methoxy-10H-quindoline (0.46%), apigenin (0.59%), and berberine (0.85%) (Figure 1, Table 1).

3.2. Acute Toxicity

Table 2 shows the changes observed in the experimental animals following the administration of KWAPF01. There were no observable changes in the control group (Group 1), while piloerection was observed across all groups that received KWAPF01. Tremor and reduced motility were observed at dose 1500 mg/kg bodyweight and above. Data relating to mortality are presented in Supplementary Table S2 and Table 3. The rats dosed at 3000 mg/kg bodyweight died within 72 h, while 75%, 25%, 0%, 0%, and 0% mortality were recorded within the same period at 2500, 2000, 1500, 1000, and 0 mg/kg bodyweight doses.

3.3. In Silico Studies

3.3.1. Molecular Docking Analysis

Table 4 shows the binding affinity of the ligands for Mus musculus AChE. Catechol and nicotine had the lowest binding affinity of −5.3 and −6.7 kcal/mol, respectively, relative to berberine (−10.8 kcal/mol) with a comparable binding affinity score to donepezil (−11.1 kcal/mol), a standard AChE inhibitor, with a binding affinity. Hydrogen bond, π-effects, and van der Waal interactions were the predicted interactions.

The binding poses of donepezil and berberine with the best affinity for AChE are presented in Figures 2 and 3, respectively. Both ligands form van der Waal and pi interactions as well as hydrogen bonds with the amino acid residues at the active site of the enzyme. Trp86, Trp286, Tyr337, and Phe295 are the interacting amino acid residues common to the donepezil-AChE and berberine-AChE interaction plot. The interaction of these residues could be responsible for the observed affinity in each case.

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(b)

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3.3.2. Pharmacodynamic and Pharmacokinetic Profiling

Table 5 shows the selected pharmacodynamic, pharmacokinetic, and physicochemical properties of KWAPF01 secondary metabolites. The compounds have good implicit n-octanol/water partition coefficient (iLOGP) values ≤5, molecular weight ≤500 daltons (except arjungenin, which is slightly above 500 daltons), good gastrointestinal (GI) absorption, and 55–56% bioavailability score. Arjungenin, berberine, cryptolepine, terminalin-A, and 11-methoxy-10H-quindoline are P-gp substrates, while berberine, catechol, chrysin, cryptolepine, nicotine, terminalin-A, and 11-methoxy-10H-quindoline are blood-brain barrier permeants, and many of these secondary metabolites are possible inhibitors for some cytochrome (CYP) isoforms (Table 5).

The pharmacokinetic profiles of the secondary metabolites were further represented as BOILED-Egg infographic system (Figure 4), and it was observed that friedelin was out of range, while terminalin-A had poor intestinal absorption. Donepezil and 11-metoxyquindoline share similar WLOGP and TPSA values. Apigenin and galangin also share similar TPSA and WLOGP values. Only nicotine, catechol, and chrysin were predicted not to be a P-gp substrate and BBB permeant and have high passive GI absorption. The detailed pharmacokinetic properties of the identified compounds are presented in Table 5.

4. Discussion

The upsurge in the use of herbal medicines in treating diseases calls for more effort towards investigating their potential toxicities as many adverse reactions have been reported following the consumption of herbal products [4].

Judging by the LD₅₀ value obtained, KWAPF01 could be said to be slightly toxic as earlier reported by Hodge and Sterner [26]. The choice of studying acetylcholinesterase inhibitory potential of the identified metabolites was informed because of the piloerection, tremor, and lacrimation observed following administration of KWAPF01. These observations are some of the clinical signs of acetylcholinesterase inhibition, as reported by Maksimović et al. [27]. AChE is a cholinergic enzyme found primarily at postsynaptic neuromuscular junctions in muscles and nerves [28]. In contrast to most other neurotransmitters, acetylcholine (ACh) postsynaptic action is not terminated by reuptake and AChE is responsible for hydrolysing ACh to acetic acid and choline to terminate neuronal transmission and signalling in the synapse [29]. Therefore, low AChE activity causes over excitation of nerves, ACh dispersal, and activation of nearby neurons [30].

The result of the HPLC analysis of KWAPF01 is consistent with that of phytochemical analysis where all the 11 identifiable compounds belonged to the four major classes of phytocompounds, including phenolics (catechol), triterpenoids (friedelin, arjungenin, and terminalin-a), flavonoids (chrysin, galangin, and apigenin), and alkaloids (nicotine, berberine, cryptolepine, and 11-methoxy-10H-quindoline). Going by this composition, it could be expected that KWAPF01 will have a broad range of biological activities. For instance, among the health beneficial constituents of the formulation are flavonoids such as apigenin, chrysin, and galangin with anti-inflammatory and antioxidant effects [31, 32]. Arjungenin has been reported to possess hepatoprotective [33] and antiviral activities [34], while cryptolepine has an antihyperglycemic effect [35]. Nevertheless, the results of the acute toxicity studies are consistent with that of the computational analysis, suggesting that KWAPF01 affects the nervous system as it contains nicotine and many molecules with the prospect to inhibit AChE as shown by the molecular docking results. These include berberine, friedelin, galangin, and chrysin. Among the components of KWAPF01, berberine has the highest affinity (lowest binding energy) for AChE. The low binding energy predicted is a result of noncovalent interactions such as hydrogen bond, π-effects (e.g., pi-pi and pi-sigma), and van der Waal contacts that it established with the AChE.

The majority of the identified molecules were predicted to have high gastrointestinal absorption except for friedelin and terminalin-A, and this suggests that the contributions of the two molecules to the observed changes could be minute. However, all the compounds had iLOGP (octanol-water partition coefficient) less than 5, and according to Lipinski’s rule, they can permeate the lipid bilayer membrane. The bioavailability scores show the probability of the molecule having at least 10% oral bioavailability, and the majority of the identified compounds and donepezil have the same score. However, the P-glycoprotein efflux system found in the GI tract, blood-brain barrier, and several regions of the body [20, 36] could limit the bioavailability of the molecules that were predicted to be P-gp substrates. Except for arjungenin, friedelin, nicotine, and terminalin-A, the compounds found in KWAPF01 could bring about some form of drug-drug interactions when they are administered with other drugs as they all inhibit some significant cytochrome isoforms, which are responsible for most cytochrome biotransformation [37, 38].

Nicotine is the most abundant secondary metabolite in KWAPF01 constituting 41.21% of the herbal formulation. It has been reported to be a potent agonist of nicotinic acetylcholine receptors (nAChRs) except at nAChRα9 and nAChRα10 subunits [39]. It acts on pentameric nAChRs throughout the nervous system and skeletal muscle and some other non-neuronal sites. The subunits of nAChRs, in tissues, vary and have different characteristics on the binding of agonists [40]. Nicotine binding activates the release of catecholamine leading to ventricular tachycardia [41]. Also, catechol has been reported to cause convulsion, peripheral vasoconstriction, and subsequent increased blood pressure as reported by the United States Environmental Protection Agency [42].

The synergistic effects of KWAPF01 constituents particularly nicotine, catechol, and other molecules (berberine, friedelin, apigenin, chrysin, and galangin) with high affinity for AChE as suggested by the molecular docking results might have aggregated to the behavioural changes, morphological changes, and mortality observed at 2000, 2500, and 3000 mg/kg bodyweight doses during the acute toxicity studies.

5. Conclusion

Overall, consequent upon the data presented in this study, it could be inferred that the KWAPF01 commercial formulation has components that can affect the nervous system particularly the cholinergic system, as evident from the acute toxicity and molecular docking results, and this effect is elicited possibly through the inhibition of AChE, a key enzyme of the cholinergic system, and agonistic effect at nAChRs. Based on these observations, it is recommended that consumption of KWAPF01 should be cautiously guided as it contains components with prospects to perturb the nervous systems and those that can make its users addicted. Studies investigating repeated dosing for neurotoxicity of KWAPF01 and the exact mechanism of actions of the identified AChE inhibitors are imperative. It is equally important to establish if the prospective AChE inhibitors identified in this study can be optimized for the treatment of diseases resulting from low levels of acetylcholine, such as Alzheimer’s disease. Efforts are underway in these directions [43].

Data Availability

The data obtained in this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no known competing financial interests.

Acknowledgments

The authors received no financial support for the research, authorship, and publication of this article.

Supplementary Materials

Supplementary Table S1: Quantitative phytochemical composition of KWAPF01 extract. GAE: gallic acid equivalent; QAE: quercetin equivalent; DE: diosgenin equivalent; QE: quinine equivalent; TAE: tannic acid equivalent. Supplementary Table S2: STATA probit LD₅₀ analysis output. The LD₅₀ was calculated from the model fitted from the output above. α = βx + c, where α is the invNorm of response rate (0 at 50%), β is the coefficient of response variable (16.5331), x is the response variable (log of dose), which is usually the unknown variable, and c is the constant (−55.3449). The confidence interval was generated using IBM SPSS, version 21. . (Supplementary Materials)

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Copyright © 2022 A. Raliat Aladodo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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