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Altawil et al., J Forensic Toxicol Pharmacol 2015, 4:1 http://dx.doi.org/10.4172/2325-9841.1000133 Journal of Forensic Toxicology and Pharmacology Research Article A SCITECHNOL JOURNAL Analgesic, Antipyretic and AntiInflammatory Activities of the Egyptian Spitting Cobra, Naja Nubiae Venom Hanan JA Altawil1, Mohamed A Abdel-Rahman1, Mohamed S ElNaggar1, Zakaria A El-Khayat2 and Mohamed M Abdel-Daim3* 1Department of Zoology, Faculty of Science, Suez Canal University, Ismailia, Egypt 2Department of Clinical Biochemistry, National Research Centre, Dokki, Egypt 3Department of Pharmacology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt *Corresponding author: Mohamed M Abdel-Daim, Department of Pharmacology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, 41522, Egypt , Tel: +20643207052; E-mail: [email protected] Rec date: Feb 06, 2015 Acc date: Mar 11, 2015 Pub date: Mar 13, 2015 Abstract Objectives: Although many venomous snakes represent a potential human health threat, their venoms provide a rich source of active components, many of which have been recently identified, and used as potential candidates for pharmacological therapeutic purposes. The current study was designed to evaluate the analgesic, antipyretic and antiinflammatory activities of the Egyptian spitting cobra Naja nubiae venom. Methods: The venom of N. nubiae was intraperitoneally injected at two dose levels (1/10 and 1/5 LD50). The peripheral and central analgesic effects were examined using acetic acidinduced abdominal writhing in mice and tail immersion test in rats, respectively. Brewer’s yeast-induced pyrexia in rats was carried out to determine the antipyretic activity of the same doses, whereas the anti-inflammatory activity was tested using carrageenan-induced paw edema in mice. Results: The results showed that N. nubiae venom produced a significant analgesic activity in acetic acid-induced abdominal constriction response in mice and thermal nociception in rat. Moreover, the venom revealed a significant antipyretic effect on yeast-induced pyrexia. In paw edema, venom exhibited a significant activity with a maximum percentage of inhibition reaching 60.1% on both doses after 5 hour treatment, which was more powerful when compared with the standard drug; diclofenac sodium (38.6%). Histologically, the venom induced a moderate inflammatory cells infiltration in the dermis of paw. Conclusion: These results suggest potential analgesic, antipyretic, and anti-inflammatory activities of the Egyptian spitting cobra crude venom. Keywords: Naja nubiae; Snake; Venom; Analgesic; Antipyretic; Anti-inflammatory; Pharmacology; Egypt Introduction Venomous snakes became the subject of intense studies for understanding their venoms' biochemical composition, and the mechanisms by which they cause harmful effects. In spite of their toxicological effects, several isolated snake venom proteins and peptides have a wide range of pharmaceutical activities [1]. Snake venoms possess heterogeneous composition of proteins, peptides, carbohydrates, lipid and amines, that act by different mechanisms to cause paralysis, death and digestion of the prey, and to defend against predators [2]. On the other hand, they possess antimicrobial activity against gram-positive and gram-negative bacteria [3-4], antiviral activity against several types of viruses, including Herpes simplex virus [5], yellow fever and dengue [6], antiparasitic activity against Leishmania [7] and Plasmodium species [8], antifungal activity [9] and anticancer activities [10]. In addition, several snake venoms displayed analgesic properties in experimental animal models of acute and chronic pain and humans as well. Data from the beginning of the last century indicated that, certain snake venoms, when administered in different formulations to human beings, induce potent and long-lasting analgesic effects [11]. For example, the long-chain -neurotoxin from Thailand's cobra venom had anti-inflammatory and antnociceptive effects on adjuvant-induced arthritis [12]. The Cobra is the most venomous snake in the world and caused human deaths. The Egyptian Spitting cobra (genus Naja) has a highly modified venom apparatus enabling it to eject a fine stream of venom from their fang tips for several meters, that cause painful and potentially blinding ocular envenoming [13]. Recently, proteomic analysis of spitting cobra venom revealed high cytotoxin and cardio toxin protein family [14]. Crude N. nigricollis venom screened for cytotoxicity against B16F10 melanoma and mouse chondrosarcoma cell lines [15]. In addition, some peptides isolated from its venom exhibit antimicrobial activity [16]. Although many natural products have been used traditionally for their medicinal purposes, there is still huge need for these products to solve many emerging health problems [17-19]. The present study was designed to evaluate the analgesic, antipyretic and anti-inflammatory effect of crude Egyptian spitting cobra N. nubiae venom on experimental animal models. Materials and Methods Venom collection and preparation Naja nubiae was identified by department of Wild Life Management and Zoo Medicine, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt, and the venom was collected from the snakes by manual milking. Then, the venom were pooled, lyophilized and stored at -20°C. The venom powder was dissolved in the appropriate buffer and centrifuged prior to use. Experimental animals All animals used in the present study and experimental protocol were approved by the Research Ethics Committee of Faculty of Veterinary Medicine, Suez Canal University, and were carried out in accordance with the Guide for the Care and Use of Laboratory Animals (Approval No. 201503 ). Adult male albino mice (20-25 g) and albino rats (100-150 g) were purchased from the breeding unit of All articles published in Journal of Forensic Toxicology and Pharmacology are the property of SciTechnol and is protected by copyright laws. Copyright © 2015, SciTechnol, All Rights Reserved. Citation: Altawil HJA, Abdel-Rahman MA, El- Naggar MS, El-Khayat ZA, Abdel-Daim MM (2015) Analgesic, Antipyretic and Anti-Inflammatory Activities of the Egyptian Spitting Cobra, Naja Nubiae Venom. J Forensic Toxicol Pharmacol 4:1. doi:http://dx.doi.org/10.4172/2325-9841.1000133 Theodor Bilharz Research Institute (Cairo, Egypt). Mice and rats were left for 1 weak to adapt to laboratory conditions. They were kept in plastic cages with wire mesh covers. The animals were kept under standard environmental conditions of temperature and humidity and fed with standard diet and water ad libitum. Estimation of Median Lethal Dose (LD50) The venom of N. nubiae with different known doses (D) was injected intraperitoneally into 8 weighted mice, and then these animals were observed to record the mortality for each. After injection, the survival time (T; time between injection and death) of each animal for 24 hours was recorded. The regression line was plotted using the values of D/T versus D, and the LD50 was calculated according to Meier and Theakston [20]. Analgesic activities The antinociceptive activities of N. nubiae venom were evaluated using mice acetic acid-induced writhing test and rat tail immersion test. Acetic acid-induced writhing test Healthy male mice weighing (20-25 g) were used and withdrawn from food 2 hours before the start of experiment, and were divided into four groups (6 mice each). The 1st group was intraperitoneally injected with physiological saline (10 mg/kg), and considered as a control. The 2nd group received 1/10 LD50 (0.042 mg/kg) of N. nubiae venom. The 3rd group received 1/5 LD50 (0.084 mg/kg) of the venom, and the 4th group received standard drug; aspirin (100 mg/kg ip). Thirty minutes later, all groups were intraperitoneally administered 1% glacial acetic acid (10 ml/kg). The number of abdominal constrictions was counted after 5 minutes of acetic acid administration for the period of 15 minutes. As evidence of reduction of writhing percent inhibition of writhing was calculated according to the following formula (control mean-treated mean) /control mean ×100 [21]. Rats tail immersion test Adult male albino rats weighing (100–140 g) were used, and divided into four groups each of 6 animals. The 1st group received Saline (10 ml/kg). The 2nd and 3rd groups received N. nubiae venom at the dose of 1/10 LD50 (0.147 mg/kg), 1/5 LD50 (0.294 mg/kg), respectively. The 4th group intraperitoneally given morphine (10 mg/kg). The animal was kept in vertical position to hang the tail, which was up to 3cm into 55 ± 0.5°C water bath. The time in seconds to withdraw the tail out of water was taken as the reaction time (Ta). The reading was taken after 0,1,2,3,4 and 5 hours of administration of the test drugs while Tb was considered as the reaction time for the control group. Percentage of analgesic activity =Ta – Tb/Tb × 100 [22]. Brewer's yeast-induced pyrexia in rats Antipyretic activity of N. nubiae venom was evaluated by Brewer's yeast induced pyrexia in rats as described by [23]. Twenty four male albino rats were randomly divided into four equal groups, each of 6. The 1st group received normal saline (10 ml/kg), and served as a control. The 2nd and 3rd groups intraperitoneally injected with the venom (1/10 LD50 and 1/5 LD50 and mg/kg, respectively) (0.147 and 0.294 mg/kg). The 4th group received the standard drug; metamizole (5 mg/kg). The fever was induced by injection of dried yeast Volume 4 • Issue 1 • 1000133 (Saccharomyces cerevisiae) (20% aqueous suspension in physiological saline, 10 ml/kg body weight) at the nape of the neck. The initial body temperature was measured rectally with a lubricated digital thermometer, 17 hour after the yeast injection to determine the pyretic response to yeast. Only rats that showed an increased temperature of at least 0.5°C were selected for the experiment. Then, test agent and standard drug were intraperitoneally administered. The temperature was recorded at 1 hour intervals for 5 hours after drug administration. Carrageenan-induced paw edema in mice Anti-inflammatory activity of N. nubiae venom was evaluated using carrageenan-induced mouse paw edema [24]. In this method, approximately 50 µL of 1% carrageenan suspension (prepared one hour before the experiment by dissolving 50 mg of carrageenan powder in 5 ml of 0.9% physiological NaCl) was injected subcutaneously into the plantar surface of the right hind paw. The animals were randomly divided into five groups (6 mice each). The 2nd, 3rd, 4th and 5th groups were intraperitoneally injected with saline (10 ml/kg), (0.084 and 0.042 mg/ kg of the venom) and diclofenac sodium (1 mg/kg), respectively. Then, carrageenan was administered, 1 hour later. The 1st group was used as a control, and received 10 mg/kg saline. Paw thickness was measured before carrageenan injection (zero time) and at 1 hour intervals for 5 hours using a skin caliber. The anti-inflammatory activity was calculated as percent inhibition of carrageenan–induced paw edema using the following formula [25]: Inhibition percent = (control mean-treated mean) /control mean ×100 At the end of the experiment, mice were sacrificed and specimens of paw tissue were taken for histopathological examination. For each group, four sections of the whole paw stained with hematoxylin and eosin and evaluated using a light microscope. Statistical Analysis The obtained data were represented as mean ± standard errors of mean (SEM) of 6 animals. The data were analyzed statistically using analysis of variance (one-way ANOVA) followed by Dunkin test for multiple comparisons. Statistical significance was considered at P˂0.05. Statistical Package for Social Sciences (SPSS) for Windows version 20 software was used throughout this analysis. Results Acute toxicity study The approximate LD50 of N. nubiae venom was calculated to be 0.42 mg/kg body weight, and 1/5 and 1/10 LD50 (0.084 and 0.042 mg/ kg) have been used in the pharmacological properties of this venom. Analgesic activities Using the mouse writhing test, N. nubiae venom was significantly (P<0.05) reduced writhing behavior in a dose dependent manner. The inhibition percents were 60.60, 72.00, and 55.26 for the venom at 0.084 and 0.042 mg/ kg and aspirin (100 mg/kg), respectively (Table 1). Regard to the rat tail immersion test, the analgesic effect of the venom administrated at doses of 0.147 and 0.294 mg/kg caused a • Page 2 of 6 • Citation: Altawil HJA, Abdel-Rahman MA, El- Naggar MS, El-Khayat ZA, Abdel-Daim MM (2015) Analgesic, Antipyretic and Anti-Inflammatory Activities of the Egyptian Spitting Cobra, Naja Nubiae Venom. J Forensic Toxicol Pharmacol 4:1. doi:http://dx.doi.org/10.4172/2325-9841.1000133 potent time increase in the tail flick response latency time as compared to the control as shown in (Table 2). Treatment Number of Writhing per 10 minute % Inhibition (PIP) Acetic acid control 36.83 ± 1.47 1/10 LD50 venom 14.50 ± 0.96* 60.60* 1/5 LD50 venom 10.33 ± 1.12* 72.00* Aspirin (100 mg/kg) 16.50 ± 0.96*,# 55.26*,# Mean ± SEM (6 animals / group). (*) Represents a significant difference between Acetic acid control and treated groups using Student Unpaired t-test (p<0.05). (#) Represents a significant among all groups using one-way ANOVA (P ≤ 0.05). The maximum effect of the venom (0.294 mg/kg) was observed at 1st hour; a percentage of inhibition reaching 149.50% while at the dose of 0.147 mg/ kg it was 106.00%. Table 1: Analgesic effect of Naja nubiae venom using acetic acidinduced abdominal writhing in mice (Note: Data are presented as Response time after drug treatment (seconds) Treatment 0 hour 1st hour 2nd hour 3rd hour 4th hour 5th hour Normal control 1.83 ± 0.31 2.00 ± 0.26 2.50 ± 0.22 2.33 ± 0.33 2.00 ± 0.37 1.83 ± 0.17 1/10 LD50 venom 2.52 ± 0.19 4.12 ± 0.14* 3.73 ± 0.27* 4.68 ± 0.35* 3.58 ± 0.21* 2.74 ± 0.24* 1/5 LD50 venom 2.50 ± 0.22 4.99 ± 0.81* 4.71 ± 0.41* 4.81 ± 0.27* 3.55 ± 0.33* 2.88 ± 0.28* 2.33 ± 0.21 6.17 ± 0.54 5.17 ± 0.4 4.87 ± 0.1 4.41 ± 0.46 3.47 ± 0.29 Morphine mg/kg) (3 Table 2: Analgesic effect of Naja nubiae venom using tail immersion test in rats (Note: Data are presented as Mean ± SEM (6 animals / group). (*) Represents a significant difference between normal control and treated groups using Student Unpaired t-test (p<0.05). (#) Represents a significant difference between all groups at time intervals using one-way ANOVA (P ≤ 0.05). Antipyretic effect of N. nubiae venom The experimental rats showed a mean rectal temperature higher than 38°C in18 hours after yeast injection. Treatment with N. nubiae venom (0.147 and 0.294 mg/kg) significantly (P<0.05) reduced the rat elevated rectal temperature. The antipyretic effect started from the first hour until 5 hours, after administration of venom as shown in (Table 3). The difference between two doses of N. nubiae venom was non-significant. Rats Body Temperature (°C) Treatment 0hr 1st hr 2nd hr 3rd hr 4th hr 5th hr Yeast control 38.80 ± 0.22 38.90 ± 0.17 38.80 ± 0.19 38.70 ± 0.19 38.70 ± 0.17 38.60 ± 0.13 1/10 LD50 venom 38.90 ± 0.11 38.00 ± 0.10* 38.20 ± 0.16* 38.30 ± 0.21 38.50 ± 0.19 38.60 ± 0.20 1/5 LD50 venom 38.60 ± 0.13 37.90 ± 0.15* 37.70 ± 0.13* 37.90 ± 0.10* 38.10 ± 0.10* 38.20 ± 0.10* Metamizol (5 mg/kg) 38.80 ± 0.24 38.10 ± 0.25 37.80 ± 0.26 37.50 ± 0.31* 37.80 ± 0.25* 38.10 ± 0.24 Table 3: Antipyretic effect of Naja nubiae venom using Brewer’s yeast-induced pyrexia in rats. (Note: Data are presented as Mean ± SEM (6 animals /group). (*) Represents a significant difference between yeast control and treated groups using Student Unpaired t-test (p<0.05). (#) Represents a significant difference between all groups at time intervals using one-way ANOVA (P ≤ 0.05). Anti-inflammatory effect of N. nubiae In the carrageenan-induced edema test, the paw thicknesses and percentages of inhibition by both venom doses (0.084 and 0.042 mg/ kg), were shown in (Table 4). The venom dose of 0.042 mg/kg showed a significant inhibition of paw edema starting from the first hour up to the 5th hour, while the dose of 0.084 mg/kg showed a significant inhibition of paw edema starting from the 2nd hour up to the 5th hour. Volume 4 • Issue 1 • 1000133 The venom reduced paw edema at a maximum percentage of inhibition 60.15% obtained 5th hour after carrageenan injection whereas diclofenac sodium showed a significant inhibition of paw edema of about 36.23% at 5th hour. Effect of venom in histopathology of foot paw The histopathological changes in foot paw tissue of carrageenaninduced paw oedema showed thickness in epidermis, infiltration of the • Page 3 of 6 • Citation: Altawil HJA, Abdel-Rahman MA, El- Naggar MS, El-Khayat ZA, Abdel-Daim MM (2015) Analgesic, Antipyretic and Anti-Inflammatory Activities of the Egyptian Spitting Cobra, Naja Nubiae Venom. J Forensic Toxicol Pharmacol 4:1. doi:http://dx.doi.org/10.4172/2325-9841.1000133 dermis with inflammatory cells like neutrophils, macrophages and some lymphocytes and some areas showed loosely arranged connective tissue. On the other hand, mice treated with the venom at 0.084 or 0.042 mg/kg showed a reduction in the epidermis thickness. Paw thickness (cm) Treatment 0 hr 1st hr 2nd hr 3rd hr 4th hr 5th hr Normal control 0.202 ± 0.002 0.2 ± 0.000 0.198 ± 0.002 0.2 ± 0.000 0.202 ± 0.002 0.202 ± 0.002 Carrageenan 0.21 ± 0.009 0.31 ± 0.009 0.36 ± 0.009 0.34 ± 0.009 0.33 ± 0.011 0.34 ± 0.009 1/10 LD50 venom 0.200 ± 0.000 0.283 ± 0.011 * 0.283 ± 0.011 * 0.258 ± 0.008 * 0.258 ± 0.008 * 0.250 ± 0.013 * 1/5 LD50 venom 0.200 ± 0.000 0.308 ± 0.0 08 * 0.292 ± 0.008 * 0.275 ± 0.011 * 0.275 ± 0.011 * 0.267 ± 0.011 * Diclofen (20 mg/kg) 0.200 ± 0.000 0.266 ± 0.011* 0.300 ± 0.013*,# 0.292 ± 0.008*,# 0.292 ± 0.008*,# 0.283 ± 0.011*,# Table 4: Anti-inflammatory effect of Naja nubiae venom using carrageenan-induced paw oedema in mice. (Note: Data are presented as Mean ± SEM (6 animals / group). (*) Represents a significant difference between carrageenan control and treated groups using Student Unpaired t-test (p<0.05). (#) Represents a significant difference between all groups at time intervals using one-way ANOVA (P ≤ 0.05). Moderate infiltration with inflammatory cells like neutrophils, macrophages and some lymphocytes compared with the carrageenan control group, all these observations shown in (Figure 1). Figure 1: The histopathological changes in mice foot paw tissue (Note: The histopathological changes in mice foot paw tissue (A) Normal control mice foot paw tissue, (B) Carrageenan–induced mice paw inflammation control, showed wide epidermis and infiltration of the dermis with inflammatory cells like neutrophils, macrophages and some lymphocytes. (C,D) Mice paw treated with 1/10, 1/5 LD50 (0.084 and 0.042 mg/ kg) N. nubiae venom showed moderate infiltration with inflammatory cells like neutrophils, macrophages and some lymphocytes. (E) Mouse treated with diclofenac sodium (100 mg/kg) showed minimal infiltration with some neutrophils and lymphocytes. Discussion The venoms of Elapid snakes, genus Naja, contain numerous polypeptide components, the majority of which being toxins (neurotoxins and cardiotoxins) responsible for the lethality of the bite. In addition, the venom includes many bioactive molecules with important pharmacological activities [26]. The present study was carried out to evaluate antinociceptive, antipyretic and antiinflammatory activities of the crude Egyptian cobra (N. nubiae) venom on the experimental animal models. Volume 4 • Issue 1 • 1000133 Our study examined the analgesic effect of the N. nubiae venomtreated animals at the doses of 1/5 and 1/10 LD50 in models of peripheral and central pain; writhing and tail immersion test respectively. Intraperitoneal injection of acetic acid produces pain via liberating endogenous substances and other pain mediators like arachidonic acid via cyclooxygenase, and prostaglandin pathway [27] or irritation of visceral surfaces, which lead to the release of histamine, bradykinin, prostaglandins, and serotonin [28]. The venom could reduce the writhing behaviors and increase tail withdrawal latency at both tested doses through its peripheral and central effects respectively, and its analgesic effect could be related to the inhibitory action on the release of histamine, bradykinin, prostaglandins, and serotonin. On the other hand, acid-sensing ion channels (ASICs) H+gated Na+ channels are generally considered principal players in the pain pathway. Some researcher discovered two closely related 57 amino acid peptides in the venom of the deadly black Mamba snake that produced potent and reversible blockade of ASIC1a. These natural antagonists were effective analgesic, and that they acted on several ASIC isoforms found in both the PNS and CNS [29]. These ion channels might play a role in analgesic action of the venom. Subcutaneous injection of yeast in rats induces pyrexia by stimulation of the hypothalamic area that controls body temperature, via prostaglandins synthesized within the central nervous system (CNS), which results in increased heat production and decreased heat loss. The inhibition of prostaglandin synthesis can be achieved by inhibiting the cyclooxygenase enzyme production [27]. In the present study, the venom at both tested doses and metamizole return the elevated body temperature to its normal level, and this effect might be due to its inhibition in central prostaglandins' synthesis [24]. The presence of edema is one of the prime signs of inflammation. It has been documented that carrageenan-induced mice paw edema is a suitable in vivo model to predict the value of anti-inflammatory agents, which act by inhibiting the acute inflammatory mediators, and this method has frequently been used to assess the anti-edematous effect of natural products [30]. Inflammation induced by carrageenan was observed to have biphasic the initial phase is due to release of histamine, serotonin and kinin in the first hour after the administration of carrageenan, and late phase (2–3 hours) has been • Page 4 of 6 • Citation: Altawil HJA, Abdel-Rahman MA, El- Naggar MS, El-Khayat ZA, Abdel-Daim MM (2015) Analgesic, Antipyretic and Anti-Inflammatory Activities of the Egyptian Spitting Cobra, Naja Nubiae Venom. J Forensic Toxicol Pharmacol 4:1. doi:http://dx.doi.org/10.4172/2325-9841.1000133 shown to be a result of overproduction of prostaglandins, bradykinin and lysosome like substance [31] after 3 hours. The result of pre-treatment venom demonstrated that the venom (at dose of 0.042 mg/ kg) and diclofenac sodium begin their effects at the early phase (1 hour) of inflammation, the first phase begins immediately after the injection of carrageenan, and diminishes in 2 hours, which has been reported because of release of histamine and serotonin primarily. Based on this an assumption can be made that may be showing its effect through inhibition of histamine and serotonin release. The higher dose of the venom (0.084 mg/kg) induced a significant inhibition starting from the 3rd hour of inflammation, while the second phase begins after 2nd hour, and remains up to 5 hours, which has shown its effect through inhibition of the release of prostaglandin-like substances. The two venom doses inhibited mice paw volume by 60% at 5th hour of carrageenan injection. The results were higher than that of diclofenac sodium, which reduced the paw volume by 36%. As the carrageenan-induced inflammation is a significant predictive test for anti-inflammatory agents acting by inhibiting the mediators individually or in combination. Which agreed with previous studies, the neurotoxin from Thailand's cobra venom, had anti-inflammatory and antinociceptive effects on adjuvant arthritis [12]. The histopathology of the mice foot paw confirm our previous results as both tested doses reduced inflammatory cells' infiltration, including neutrophils, macrophages and some lymphocytes compared to the carrageenaninduced- non treated control group, which confirmed of inhibition of inflammation in tissue with two doses venom. Finally, many compounds with anti-inflammatory activity could also have analgesic activity and antipyretic activity [24], which is also in agreement with our findings on the analgesic, antipyretic and antiinflammatory activity of venom. 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