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Analgesic Effect of Zolmitriptan Nanoparticles in Experimental Animal Models

Background: Zolmitriptan is used to treat migraine and certain other headaches. This study has been done to prepare specific Zolmitriptan Nano-nasal spray (Z-NPS) by ion gelation technique to evaluate the efficacy of analgesic activity of test drug as a nano nasal spray of Zolmitriptan (Z-NPS) and conventional preparation as a standard drug (Zolmist) against Nitro-glycerine induced migraine. The study was performed on mice by using hot plate method. Methods: In this study male Swiss albino mice weighing between 25-30 grams were taken and divided into 4 groups with 6 mice in each group. Zolmitriptan loaded chitosan nanoparticles (Z-NPS) was administered nasally (using specific inhalation mask) at a dose of 5 mg/kg and was compared with the control group which received water for injection and the standard drug Zolmitriptan (Zolmist) at a same dose in mice induced migraine using hot plate method. Reaction times were measured at 10, 20, 30 and 60 minutes after drug administration. Results: The test drug (Z-NPS) at a dose of 5 mg/kg after 10 minutes of drug administration showed an increase in the reaction time compared to the standard drug (Zolmist) at same dose of drug administration. However, Z-NPS showed significant increase in the reaction time after 10 minutes as compared to Zolmist. Conclusion: Zolmitriptan has significant analgesic properties in central-analgesic model i.e. Hot-plate method. The test drug could be used for anti-migraine activity.


Background
Migraine is a syndrome clinically manifested in attacks with dominant symptoms like unilateral, rarely generalized, recurrent headache, and occasionally lasts for days. According to different sources, it is considered that about 10-15 % of world population suffers from some type of this syndrome. Migraine is most frequently clinically revealed in the age of 30-40, therefore in the most productive period with significant share in treatment costs and a great influence to the working ability of those patients. [1] Migraine headache is a neurological disorder often initiated by a trigger and characterized by a headache, which may be accompanied by a variety of multiple organ/system symptoms, such as nausea, vomiting, and urinary frequency.
Triptans are serotonin 5-hydroxytryptamine (5-HT) receptor agonists that are generally effective, well tolerated, safe, and used to treat migraine and certain other headaches. They may be taken subcutaneously, orally as tablets, capsules, or quick-dissolving wafers, or intranasally as a spray. [1] The use of polymeric nanoparticles (PNP) in drug delivery, generally increases the stability of the pharmaceutical agents and it can be easily and cheaply fabricated in large quantities by a multitude of methods. [2] Nanoparticles (NPS) have been extensively investigated in biomedical and biotechnological areas and, especially, in drug delivery systems for drug targeting. The advantages of targeted drug delivery to the specific site of the body, paved the way for applying NPs to achieve this type of drug delivery. Much attention has been provided to non-parenteral routes like oral, pulmonary, nasal and opthalmic delivery of the drugs. [3] The present study mainly aimed at delivering a drug into the brain via the intranasal route using a drug loaded chitosan nanoparticles.
The nasal route was adopted to exploit its avoidance of the hepatic first-pass metabolism to increase the absolute bioavailability.
The formulation of targeted nano nasal spray of Zolmitriptan (Z-NPS) using ion gelation technique were selected as a test drug to enhance permeability across the blood-brain barrier and therefore its brain delivery. The

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© 2018 Published by IJIRMS Publication
nanoparticles along with best excipients then conducted for analgesic activity using hot plate test in mice. The study was carried out with a view to elucidate the analgesic action of Z-NPS and to compare it with standard drug (Zolmist).

Preparation of Zolmitriptan-loaded Chitosan Nanoparticles by ion gelation method:
Chitosan nanoparticles containing the drug Zolmitriptan (Z-NPS) were prepared by the ionotropic gelation technique [5,6]. Accurately weighed chitosan was dissolved in 1 % v/v acetic acid solution, to which Tween 80 and the drug were added. Sodium tri poly phosphate (TPP) was dissolved in distilled water. To the chitosan-drug solution, TPP solution was added dropwise through a no.4 syringe needle and continuously stirred using a mechanical stirrer (Remi Motors-RO-123, RPM 4000) at room temperature for 30 min, which led to the formation of nanoparticles. Subsequently, the pH was adjusted to 5.5 with the help of a required amount of 1N, NaOH and then centrifuged at 12000 rpm using a refrigerated centrifuge (Eppendorf Centrifuge 5430R). The prepared Zolmitriptan-loaded Chitosan nanoparticles (Z-NPS) by the Ion gelation technique were conducted for analgesic activity via intranasal drug delivery system using specific inhalation mask (Fig. 1 A) in mice.  [7,8] ., for evaluating antimigraine compounds was adopted.

Animals
Animals were housed under temperature 22 ± 3oC, relative humidity 30-70 %, and 12-hour light and 12-hour dark cycle. Animals were housed in standard polypropylene cages with stainless steel top grill having facilities for pelleted food and drinking water in bottle. Sterile paddy husk was used as bedding material and changed every day. The diet and drinking water were free from any contaminant and provided ad libitum.
The study protocol was accepted by the institutional ethical committee and followed the guidelines of CPCSEA.

Grouping
Male Swiss albino mice, weighing 25-30 gms were divided into four groups, each group consisting of 6 animals, water for injection was used as solvent for all the groups.
The dose of test drug and standard was 0.5 mg/Kg body weight of Swiss albino mice, were dissolved in water for 1. The first set of experiments conducted will be set as a control group. After intranasal inhalation of the water for injection by using the inhalation mask (100 µl of sample per spray), group-1 (controltreated with water for injection). 2. The second group is disease controlled group.
Nitro-glycerine, dissolved in saline alcohol and propylene glycol, will be injected i.p. at a dose of 5 mg/kg to Swiss albino mice. Systemic nitroglycerine (NTG) produces spontaneous-like migraine attacks in migraine sufferers and induces a condition of hyperalgesia in the rat 4 h after its administration [9,10]. (Disease control) 3. The third set of experiment will be conducted for determined the anti-migraine activity of Nano nasal spray of Zolmitriptan (Z-NPS) preparation (test drug) in the migraine-induced mice. 4. The fourth group is to determine the anti-migraine activity of the conventional preparation as a standard drug (Zolmist) in the migraine-induced mice.
The number of animals in each group will be six and are divided into 4 groups as follows.

Hot plate test
Procedure 24 Male mice were divided into four groups, each group with 6 animals. Mice were randomized and grouped based on the reaction time within 10 minutes for which it was not observed a large variation by testing on four separated occasions. All the groups except control group received intraperitoneal injection of Nitroglycerine 5 mg/kg body weight 4 hrs before the test substance administration.
Group I-Control and Group II-Positive control received vehicle, Group III and Group IV animals received 0.5 mg/kg body weight of test substance and standard drug respectively through intranasal route using specific inhalation mask (Fig.  1 B). The hot plate test was performed in Swiss albino mice to determine the analgesic activity of test substance.
Immediately after treatment, mice were placed on hot plate maintained at 55 ± 2 0C and the reaction time was recorded by observing the licking of the paws or jumping movements at 10, 20, 30 and 60 minutes after the administration of test substance [11,12]. The graphical representation in figure 1 A/B.

Statistical analysis
Results were expressed as mean ± SEM. Statistical analysis was performed by one way Anova followed by Dunnet test. Significant values were mentioned based on p value.
*p< 0.005, **p< 0.001 and ***p< 0.0001 when compared to positive control [13].  Figure 2 demonstrated the relative activity of test substance with respect to the standard drug in the hot plate method. Values were expressed as mean ± SEM, ###P < 0.0001 considered significant as compared to control. *P < 0.005, **P < 0.001 and ***P < 0.0001 considered significant as compared to positive control.

Conclusion
The results of analgesic activity by using hot plate method, indicated that the test substance, possesses significant analgesic effect at a dose of 0.5 mg/kg body weight in mice against Nitro-glycerine induced migraine in mice (Fig. 2).