Iranian Scorpion Research Articles

In silico Discovery of Leptukalins, The New Potassium Channel Blockers from the Iranian Scorpion, Hemiscorpius Lepturus.

Blocking Kv 1.2 and Kv 1.3 potassium channels using scorpion venom- derived toxins holds potential therapeutic value. These channels are implicated in autoimmune diseases such as neurodegenerative diseases, multiple sclerosis, rheumatoid arthritis, and type 1 diabetes. The present work aims at the discovery and in silico activity analysis of potassium channel blockers (KTxs) from the cDNA library derived from the venom gland of Iranian scorpion Hemiscorpius lepturus (H. lepturus). The sequence regarding potassium channel blockers were extracted based on Gene Ontology for H. lepturus venom gland. Homology analyses, superfamily, family, and evolutionary signatures of H. lepturus KTxs (H.L KTxs) were determined by using BLASTP, COBALT, PROSITE, and InterPro servers. The predicted 3D structures of H.L KTxs were superimposed against their homologs to predict structure activity relationship. Molecular docking analysis was also performed to predict the binding affinity of H.L KTxs to Kv 1.2 and Kv 1.3 channels. Finally, the toxicity was predicted. Seven H.L KTxs, designated as Leptukalin, were extracted from the cDNA library of H. lepturus venom gland. Homology analyses proved that they can act as potassium channel blockers and they belong to the superfamily and family of Scorpion Toxin-like and Short-chain scorpion toxins, respectively. Structural alignment results confirmed the activity of H.L KTxs. Binding affinity of all H.L KTxs to Kv 1.2 and Kv 1.3 channels ranged from -4.4 to -5.5 and -4 to -5.7 Kcal/mol, respectively. In silico toxicity assay showed that Leptukalin 3, Leptukalin 5, and Leptukalin 7 were non-toxic. Three non-toxic KTxs, Leptukalin 3, 5, and 7, were successfully discovered from the cDNA library of H. lepturus venom gland. Gathering all data together, the discovered peptides are promising potassium channel blockers. Accordingly, Leptukalin 3, 5, and 7 could be suggested for complementary in vitro studies and mouse model of autoimmune diseases.

Mass spectrometric analysis of Odonthobuthus Doriae scorpion venom and its non-neutralized fractions after interaction with commercial antivenom

It is believed that antivenoms play a crucial role in neutralizing venoms. However, uncontrolled clinical effects appear in patients stung by scorpions after the injection of antivenom. In this research, non-neutralized components of the venom of the Iranian scorpion Odonthobuthus doriae were analyzed after interacting with the commercial antivenom available in the market. The venom and antivenom interaction was performed, then centrifuged, and the supernatant was analyzed by high-performance liquid chromatography (HPLC). Two peaks of Odonthobuthus doriae venom were observed in the chromatogram of the supernatant. Two components were isolated by HPLC and analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) instruments. Peptide sequencing was done by Liquid Chromatography Quadrupole Time-of-Flight Tandem Mass Spectrometry (LC-Q-TOF MS/MS). Results indicate that the components of scorpion venom mainly have a molecular weight below 10 kDa, consisting of toxic peptides that disrupt the function of sodium and potassium channels. The MALDI-TOF MS results show that two toxic peptides with molecular masses of 6941 Da and 6396 Da were not neutralized by the antivenom. According to the MS/MS sequencing data, the components have been related to peptides A0A5P8U2Q6_MESEU and A0A0U4FP89_ODODO, which belong to the sodium and potassium channels toxins family, respectively.

Taxonomy and new pictorial key of Iranian scorpions (Arachnida: Scorpionida)

Taxonomy and new pictorial key of Iranian scorpions (Arachnida: Scorpionida)

Identification, classification, and characterization of alpha and beta subunits of LVP1 protein from the venom gland of four Iranian scorpion species

Scorpion venoms contain bioactive peptides and proteins. Some, can be used for pharmaceutical purposes. So, identification of venom proteins matters because, in addition to determining the function of the toxins can also be an excellent guide to developing new drugs. Here, we got transcriptome of venom glands from four Iranian scorpion species, including Hemsicorpius lepturus, Mesobuthus eupeus, Andructunus crassicuada, and Hottentotta saulcyi using cDNA library synthesis and high-throughput transcriptomic analysis of the venom glands. In a comparative way, we identified the cDNA encoding isoforms of subunits (alpha and beta) of BotLVP1/BmLVP1-like protein in the venom gland of three species except for H. lepturus. Characterization and structure determination of the LVP1_like proteins combined with gene map analysis provided evidence of the existence of some isoforms of LVP1_like proteins, encoded by genes with two exons and one intron, which can be classified in CSαβ superfamily in the venom gland of three Iranian scorpion species. According to the high similarity with BotLVP1 and BmLVP1, these proteins could also be potent to mediate cholesterol homeostasis. However, further research is needed to prove it, and this study just may lay the foundation lead to light up this way.

The Effects of the Fraction Isolated from Iranian Buthotus shach Scorpion Venom on Synaptic Plasticity, Learning, Memory, and Seizure Susceptibility.

Epilepsy, as a neurological disease, can be defined as frequent seizure attacks. Further, it affects many other aspects of patients' mental activities, such as learning and memory. Scorpion venoms have gained notice as compounds with potential antiepileptic properties. Among them, Buthotus schach (BS) is one of the Iranian scorpions studied by Aboutorabi et al., who fractionated, characterized, and tested this compound using electrophysiological techniques in brain slices (patch-clamp recording). In the present study, the fraction obtained from gel electrophoresis was investigated through behavioral and electrophysiological assays. At first, ventricular cannulation was performed in rats, and then the active fraction (i.e., F3), carbamazepine, and the vehicle were microinjected into the brain before seizure induction by the subcutaneous (SC) injection of pentylenetetrazol (PTZ). Seizure behaviors were scaled according to Racine stages. Memory and learning were evaluated using the Y-maze and passive avoidance tests. Other groups entered evoked field potential recording after microinjection and seizure induction. Population spike (PS) and field excitatory postsynaptic potential (fEPSP) were measured. The F3 fraction could prevent the fifth stage and postpone the third stage of seizure compared to the control (carbamazepine) group. There was no significant improvement in memory and learning in the group treated with the F3 fraction. Also, PS amplitude and fEPSP slope increased significantly, and long-term potentiation was successfully formed after the high-frequency stimulation of the performant pathway. Our results support the antiepileptic effects of the F3 fraction of BS venom, evidenced by behavioral and electrophysiological studies. However, the effects of this fraction on memory and learning were not in the same direction, suggesting the involvement of two different pathways.

Analysis of Some Putative Novel Peptides from Iranian Scorpion Venom Glands, Hemiscorpius lepturus, Using cDNA Library Construction

Background: To date, more than 300,000 distinct peptides have been identified in scorpion venom. However, only a limited number of these peptides have been described. Objectives: We characterized some putative peptides from the venom gland cDNA library of the Iranian yellow scorpion Hemiscorpius lepturus. Methods: Total RNA was extracted from yellow Iranian scorpion glands. Single-stranded cDNA (sscDNA) and double-stranded cDNA (dscDNA) were synthesized by polymerase chain reaction (PCR). A cDNA library was achieved by inserting dscDNA into a special vector and subsequently transformed to chemically competent Escherichia coli as a host. The library was screened by culturing the liquid library on Lysogeny broth (LB)-agar plates. Analysis of positive clones was performed by plasmid extraction and the sequencing of the inserts. Finally, all cDNA sequences were analyzed and characterized by bioinformatics software. Results: One hundred colonies were randomly analyzed. Eighty-nine cDNA sequences had acceptable quality for bioinformatics analysis. Five sequences were selected for further analysis. The peptides related to these sequences were divided into two groups, non-disulfide bridge peptides (NDBP) and disulfide bridge peptides (DBP), the application of which in health and medical issues has been suggested. Conclusions: The data obtained in this study may be an important resource for further in vivo and in vitro functional assays to identify valuable therapeutic peptides.

Molecular Characterization of a cDNA Encoding of an Anionic Cysteine-Free Antimicrobial Peptide From the Iranian Scorpion Odontobuthus Doriae Venom Glands

Background: The venom peptides from the scorpion fauna of Iran have been poorly characterized so far.
 Objectives: In this study, we identified a cDNA encoding of an anionic cysteine-free antimicrobial peptide from the Iranian yellow scorpion odontobuthus doriae (O.doriae).
 Methods: The cDNA sequence of an anionic antimicrobial-peptide (AMP) was determined from the venom gland cDNA library of Iranian yellow scorpion O.doriae and was named ODAMP5. This sequence was characterized by a software. Then, the structure and function of its putative peptide were predicted in a bioinformatics manner. The library was constructed from 6 scorpion venom glands. The cDNA related to ODAMP5 was isolated from one positive clone of the library.
 Results: The analysis of ODAMP5 reveals a 51-residue mature peptide with an anionic property that was stable in physiological states. ODAMP5 was similar to anionic peptide Aba-2 from Androctonus bicolor and according to its structure, it can be a member of helical structure AMPs with a new type of putative conserved domain. Putative ODAMP5 has a small size which makes it convenient for synthesis.
 Conclusion: Furthermore, we created a framework to express the ODAMP5 peptide for future biomedical and pharmacological studies. ODAMP5 may be a new suitable therapeutic strategy for bacterial infection among a few recognized scorpion venom peptides without disulfide bridges.

Mass-Spectrometry-Based Lipidome and Proteome Profiling of Hottentotta saulcyi (Scorpiones: Buthidae) Venom.

Scorpion venom is a complex secretory mixture of components with potential biological and physiological properties that attracted many researchers due to promising applications from clinical and pharmacological perspectives. In this study, we investigated the venom of the Iranian scorpion Hottentotta saulcyi (Simon, 1880) by applying mass-spectrometry-based proteomic and lipidomic approaches to assess the diversity of components present in the venom. The data revealed that the venom’s proteome composition is largely dominated by Na+- and K+-channel-impairing toxic peptides, following the enzymatic and non-enzymatic protein families, e.g., angiotensin-converting enzyme, serine protease, metalloprotease, hyaluronidase, carboxypeptidase, and cysteine-rich secretory peptide. Furthermore, lipids comprise ~1.2% of the dry weight of the crude venom. Phospholipids, ether-phospholipids, oxidized-phospholipids, triacylglycerol, cardiolipins, very-long-chain sphingomyelins, and ceramides were the most intensely detected lipid species in the scorpion venom, may acting either independently or synergistically during the envenomation alongside proteins and peptides. The results provide detailed information on the chemical makeup of the venom, helping to improve our understanding of biological molecules present in it, leading to a better insight of the medical significance of the venom, and improving the medical care of patients suffering from scorpion accidents in the relevant regions such as Iran, Iraq, Turkey, and Afghanistan.

Iranian Scorpion (Odontobuthus bidentatus) crude venom change the redox potential of MCF-7 breast cancer cell line and induce apoptosis

Iranian Scorpion (Odontobuthus bidentatus) crude venom change the redox potential of MCF-7 breast cancer cell line and induce apoptosis

Discovery of a New Analgesic Peptide, Leptucin, from the Iranian Scorpion, Hemiscorpius lepturus.

Hemiscorpius lepturus scorpion stings do not induce considerable pain based on epidemiological surveys conducted in the southwest part of Iran. Accordingly, this study was aimed to identify the analgesic molecule in H. lepturus venom by analyzing a cDNA library of the scorpion venom gland looking for sequences having homology with known animal venom analgesic peptides. The analgesic molecule is a cysteine rich peptide of 55 amino acids. the synthetic peptide was deprotected and refolded. RP-HPLC, Ellman’s, and DLS assays confirmed the refolding accuracy. Circular dichroism (CD) showed helix and beta sheet contents. This peptide, called leptucin, demonstrated 95% analgesic activity at the dose of 0.48 mg/kg in hot plate assay. Leptucin at the doses of 0.32, 0.48, and 0.64 mg/kg showed 100% activity in thermal tail flick test. No hemolysis or cytotoxicity was observed at 8 and 16 μg. Histopathology evaluations indicated no hepatotoxicity, nephrotoxicity, and cardiotoxicity. We thus report that leptucin is the analgesic agent of H. lepturus venom. Regarding the high in vivo efficacy of leptucin and the fact it shows no observable toxicity, it could be suggested as a drug lead in a preclinical study of acute pain as well as the study of its mechanism of action.

Species diversity and abundance of scorpions in Ahvaz city, Southwest Iran

Abstract. Mansouri NJS, Akbarzadeh K, Jahanifard E, Vazirianzadeh B, Rafinejad J. 2021. Species diversity and abundance of scorpions in Ahvaz city, Southwest Iran. Biodiversitas 22: 763-768. Arthropods are one of the most important and diverse phyla of the animal kingdom. This phylum includes several classes of insects and arachnids, which are of medical and veterinary importance. Scorpions are at the top of the group of venomous arthropods in terms of having venomous bites and causing death. Scorpions live mainly in tropical and subtropical regions of the world and therefore have higher diversity and richness in these regions. This study aimed to investigate the biodiversity and abundance of scorpions in Ahvaz city, Khuzestan province, Iran. It has the highest species diversity and species richness in Iranian scorpions. Scorpions were collected from five regions in Ahvaz using various methods. In total 237 scorpions were collected and identified. They belonged to two families, seven genera and seven species: Mesobuthus eupeus (65%), Hemiscorpius lepturus (23.2%), Androctonus crassicauda (3.8%), Compsobuthus rugosulus (3.4%), Orthochirus zagrosensis (2.5%), Apistobuthus susanae (1.7%), Buthacus macrocentrus (0.4%). Except for H. lepturus (Hemiscorpiidae), other species belonged to the Buthidae family. That all of them were non-burrowing. M. eupeus was the dominant species diversity analysis indicated higher species richness and species diversity for summer (Margalef = 1.07; Shannon = 1.55). Logistic regression analysis showed that the variables of geographical location, humidity, and temperature had a significant relationship with the abundance of scorpion species, while height had no statistically significant.

Ecology and species composition of scorpions (Arachnida, Scorpiones) in Masjed-Soleyman County, Southwestern Iran

Aims: The current study aimed to study the scorpion ecology and fauna of Masjed-Soleyman County, southwestern Iran to manage scorpion sting-related problems during 2016–2017. Materials and Methods: Scorpions were collected from different localities of Masjed-Soleyman using rock-rolling, digging the ground, Ultra Violet flashlight, pouring water in holes, and ordinary flashlight methods. The collected scorpions were placed to 70% alcohol. Morphological studies were completed under a stereomicroscope. The scorpion species were identified using diagnostic valid key for the Iranian scorpions. Results: Out of the 318 collected scorpions, 10 species from three families, buthidae (71.1%), scorpionidae (2.2%), and hemiscorpiidae (26.7%) were identified. The most abundant species were Androctonus crassicauda (32.4%), Hemiscorpius lepturus (26.7%), and Mesobuthus phillipsii (21.4%). The females were the dominant sex, i.e., 1.7:1 (F/M) sex ratio. The highest number of scorpions were caught in August (27.7%). The highest abundant of scorpions were collected in summer (65.7%). Furthermore, the majority of specimens were hunted through of ultraviolet flashlight (44.4%). The most abundant scorpions were caught in animal husbandry (23.6%). Conclusion: Because treatment of the patients who received stings should be managed according to the kind of their venom and the scorpion species, it is important for planning treatment and prevention according to the species composition of scorpions of each region.

Correction to: Characterization, molecular modeling and phylogenetic analysis of a long mammalian neurotoxin from the venom of the Iranian scorpion Androctonus crassicauda

Correction to: Characterization, molecular modeling and phylogenetic analysis of a long mammalian neurotoxin from the venom of the Iranian scorpion Androctonus crassicauda

Spatial Distribution of Medically Important Scorpions in Iran: A Review Article

Context: There are three families and 66 species of scorpions in Iran, some of these species are medically relevant, and their sting cause public health problems. Thus, producing of the new geographical distribution of scorpions and the new species is very important. The goal of this study was to produce the distribution maps of Iranian scorpions that are medically important according to the latest information. Evidence Acquisition: This present study included a review of all the articles related to Iranian scorpions published in ISI, PubMed, Scopus, ScienceDirect, and Google Scholar databases during 2008 - 2019, using the relevant MeSH keywords. The data were entered in an Excel file, and spatial distribution maps were prepared. Results: From the review of the related published documents, we found that there are 66 scorpion species in Iran, some scorpion names have been changed and new scorpion species have been added to Iranian scorpion fauna and the spatial distribution of some species has become wider. Conclusions: Considering the new distribution maps and data on Iranian scorpions, for scorpion envenomation treatment and control programs, these variations should be regarded.

Cytotoxic and Apoptotic Induction Effects of the Venom of Iranian Scorpion (Odontobuthus bidentatus) in the Hepatocellular Carcinoma Cell Line (HepG2)

Many efforts are being made to identify new natural substances for the treatment of cancer. Containing enzymes, non-enzymes, ions, and other organic compounds, scorpion venom is a cytotoxic compound that induces apoptosis and necrosis in mammalian cells, and it could be considered as a potential anticancer agent. In this study, the cytotoxicity effects and the ability of apoptosis induction of Odontobuthus bidentatus scorpion venom on HepG2 cells were investigated. Thereafter, the cells were treated with the scorpion venom. Cell cytotoxicity was evaluated using MTT and neutral red tests. By applying catalase activity assay, determination of accumulated NO in cell culture media and GSH levels in the cells, the changes in the cells redox potential was measured and to determine the apoptosis induction, alkaline comet assay, caspase-3, and cytochrome c release assays were exploited. The expression of bax and bcl-2 genes was evaluated using RT-PCR. Considering MTT and neutral red tests, O. bidentatus scorpion venom depicts cytotoxic effects on HepG2 cells. The venom induces apoptosis by increasing NO levels. The catalase enzyme activity and the GSH level were reduced. Also, the activity of caspase-3 and the release of cytochrome c were increased in venom-treated cells. Expression of bax and bcl-2 genes in the treated cells was significantly increased (P < 0.001). These results suggest that O. bidentatus venom is a suitable source of apoptosis-inducing compounds.

Purification and characterization of a novel type of neurotoxic peptides from the venom of the Iranian scorpion Hemiscorpius lepturus.

Objective(s):Scorpion venom has toxic effects on mammals, insects and crustaceans. Toxicogenic peptides are major contributors to the scorpion venom, which make it toxic. The Hemiscorpius lepturus (H. lepturus) is one of the most common scorpion bites agent, and responsible for 95% of scorpion bite deaths cases in Iran.Materials and Methods:In this project, we fractionated the H. lepturus scorpion venom and analyzed toxic fractions of the venom. The crude venom of H. lepturus was dialyzed against distilled water and then the soluble part of the venom was isolated from the non-soluble (mucoproteins) part of the venom and loaded onto the Sephadex G-50 gel filtration column, then after determining the toxicity of the obtained fractions (fractions toxicity were detected in mice by IV injection), the resulting toxic fraction was purified with three stages of ion-exchange chromatography (anion and cationic) and RP-HPLC. The purity of the fractions was verified by SDS-PAGE electrophoreses.Results:The LD50 of H. lepturus venom was 177.01 µg/mouse. The crude venom had 7 detectable bands with molecular weights of 10-100 KDa and one band less than 10 KDa. Finally, after the different stages of chromatography, two HL2153 and HL2155 peaks were obtained from the RP-HPLC, which were depicted single bands and high purity. The electrophoretic analysis showed molecular weight 4874 Da for HL2153 and 5107 Da for HL2155 toxins.Conclusion:It is concluded that H. lepturus venom contains two HL2153 and HL2155 toxins with a relatively similar molecular weight and similar electrical charge 4874 and 5107 Da, respectively.

Expression, Purification and Docking Studies on IMe-AGAP, the First Antitumor-analgesic Like Peptide from Iranian Scorpion Mesobuthus eupeus.

Scorpion venom contains different toxins with multiple biological functions. IMe-AGAP is the first Analgesic-Antitumor like Peptide (AGAP) isolated from Iranian scorpion Mesobuthus eupeus. This peptide is similar to AGAP toxin with high analgesic activity, extracted from Chinese scorpion and inhibits NaV1.8 and NaV1.9 voltage-gated sodium channels involved in the pain pathway. In this study, IMe-AGAP was cloned in a prokaryotic expression vector; expression of toxin in Escherichia coli (E. coli) was assayed and then purified. In in-silico studies, peptide sequence was compared with other scorpion analgesic toxins. The structures of IMe-AGAP and sodium channels were modeled using homology modeling. Structural evaluation and stereo-chemical analysis of modeled structures were performed using RAMPAGE web server Ramachandran plots. Hex Server was used to investigate the interactions between IMe-AGAP and S3-S4 and also S5-S6 segments of NaV1.8 and NaV1.9. Binding energies calculation was used for evaluation of protein docking. Soluble expression of IMe-AGAP in bacteria was investigated by SDS-PAGE analysis. Pure recombinant protein was obtained by Ni-NTA affinity chromatography. The results of three-dimensional structure prediction showed βαββ topology for the toxin that is similar to the conserved structure of α-toxins. Comparison analysis between IMe-AGAP and AGAP toxins exhibited high similarity in homology modeling. Docking analysis demonstrated that IMe-AGAP can interact with NaV1.8 and NaV1.9 domains involved in pain. According to the results of homology studies and docking, IMe-AGAP might be a novel potential drug for pain treatment.

Characterization, molecular modeling and phylogenetic analysis of a long mammalian neurotoxin from the venom of the Iranian scorpion Androctonus crassicauda

Scorpion venoms are highly complex polypeptides with a wide spectrum of bioactivities. A long chain peptide with eight cysteine residues and four disulfide bonds isolated from the venom of the Iranian scorpion Androctonus crassicauda, a dangerously venomous species belongs to the Buthidae family. Toxin was purified using size exclusion and reverse phase chromatography and was characterized by molecular weight determination and amino acid sequence. The primary structure analysis shows that AnCra1 is a long peptide with 64 amino acid residues and 7255.23 Da. as molecular weight. This toxic peptide, causing severe paralysis and leading to dead. It shows highest homology with voltage-gated sodium channel alpha toxins isolated from Middle-East and North-Africa scorpions. Phylogenetic relationship of AnCra1 and other ion channel toxins from Buthidae family suggested that, separation between these families of scorpions caused by the geographical conditions led to evolutionary alterations in these venoms polypeptide sequences. Homology modeling and three-dimensional structure of AnCra1 indicated that binding residues on exposed part of the peptide have high affinity for receptor residues in Na+V ion channel, site-3. The contact surfaces characteristics and charges may be eventuate to interaction between toxin peptide and targeted channel. Molecular homology between AnCra1 with structure of Na+V neurotoxic peptides illustrated that, AnCra1 can act as novel functional putative Alpha-mammal voltage-gated sodium channel toxin.

Venoms of Iranian Scorpions (Arachnida, Scorpiones) and Their Potential for Drug Discovery.

Scorpions, a characteristic group of arthropods, are among the earliest diverging arachnids, dating back almost 440 million years. One of the many interesting aspects of scorpions is that they have venom arsenals for capturing prey and defending against predators, which may play a critical role in their evolutionary success. Unfortunately, however, scorpion envenomation represents a serious health problem in several countries, including Iran. Iran is acknowledged as an area with a high richness of scorpion species and families. The diversity of the scorpion fauna in Iran is the subject of this review, in which we report a total of 78 species and subspecies in 19 genera and four families. We also list some of the toxins or genes studied from five species, including Androctonus crassicauda, Hottentotta zagrosensis, Mesobuthus phillipsi, Odontobuthus doriae, and Hemiscorpius lepturus, in the Buthidae and Hemiscorpiidae families. Lastly, we review the diverse functions of typical toxins from the Iranian scorpion species, including their medical applications.

A forward to optimization of antivenom therapy: An in vivo study upon the effectiveness of the antivenom against early and delayed nephrotoxicity induced by the venom of the Iranian scorpion Hemiscorpius lepturus in rat

A forward to optimization of antivenom therapy: An in vivo study upon the effectiveness of the antivenom against early and delayed nephrotoxicity induced by the venom of the Iranian scorpion Hemiscorpius lepturus in rat