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WORLD JOURNAL OF PHARMACY AND PHARMACEUTICAL SCIENCES Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences SJIF Impact Factor 5.210 Volume 4, Issue 08, 21-36. Review Article ISSN 2278 – 4357 IMMUNOMODULATORS FROM PLANT SOURCE: A REVIEW Hina Yasin*1, Fakhsheena Anjum1, Hina Abrar2, Sana Ghayas1, Muhammad Ali Masood1, Tamha Fatima1, Mariam Naz1, Wajiha Jabeen1 1 Dow College of Pharmacy, Dow University of Health Sciences, Karachi, Pakistan. 2 Baqai Medical University, Karachi, Pakistan. Article Received on 25 May 2015, ABSTRACT Revised on 16 June 2015, Accepted on 07 July 2015 immune system against infections since centuries as these drug The use of phytochemicals has been a supportive practice for our substances enhance the immune response against infections. There are abundant plants which possess immunomodulatory and *Correspondence for immunostimulatory activities. The immunomodulatory activities of Author Dr. Hina Yasin various substances existing in natural sources have been determined in Dow College of this article through literature review. Various techniques are also Pharmacy, Dow determined through which separation and isolation of such substances University of Health Sciences, Karachi, could be done in Pakistan. The present review will focus on latest developments regarding immunomodulatory activities of plants which Pakistan. have been reported from the year 2000 to early 2012. KEYWORDS: Immunomodulatory agent, phytochemicals, plant source, Tinospora cordifolia, Allium sativum, Curcuma longa. INTRODUCTION Immunomodulators can be broadly categorized as immunoadjuvants, immunostimulants and immunosuppresants. Immunoadjuvants are used to escalate the effectiveness of vaccines and since particular immunoadjuvants are used with particular vaccines, thus they could be considered as specific immunostimulants. Non availability of an appropriate adjuvant for human use has been one of the important tripping blocks in our skills to develop different vaccines like malarial vaccines.[1] Immunostimulants are integrally non-specific in nature as they are predicted to augment body's resistance against infection. They can act via distinctive immune and adaptive immune www.wjpps.com Vol 4, Issue 08, 2015. 21 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences response. In healthy persons, the immunostimulants are likely to function as prophylactic or promoter agents i.e. as immunopotentiators by increasing the basic levels of immune response, and in the persons with impairment of immune response as immunotherapeutic agent. In literature, many plants are evident having immunomodulatory effect by using modern scientific methodologies. The examples of such plants include Allium sativum (Lasun), Aloe vera (Gharita kumari), Andrographis paniculata (kirayat), Asparagus racemose (Satawar), Azadirachta indica (neem), Curcuma longa (Haldi), Nyctanthus arbor-tristis (Harsinghar), Ocimum sanctum (Tulsi), Panax ginseng (ginseng), Phyllanthus emblica (amla), Picrorrhiza kurroa (kutali), Tinospora cordifolia (giloe), and Withania somnifera (Ashwagandha). The immune system commendably protects our body from invading agents and foreign bodies. There are numerous cells and molecules which are proficient in distinguishing, restraining and eradicating several harmful elements. Transition of the immune system denotes any amendment in the immune response that may implicate stimulation, expression, augmentation or inhibition of any part or stage of the immune response for extermination of foreign antigen. Various phytochemicals are recognized for possessing natural products containing anti-infective properties that work either by directly affecting the pathogen or indirectly by stimulating inherent and acquired defense mechanisms of the host. [2,3] Immunomodulating agents An immunomodulator or adaptogenic agent is the drug substance that modifies the immune system.[4] In general, immunomodulators are categorized as Immunosuppressants and Immunostimulators due to their effects. They have the capability to augment an immune response or guard against foreign bodies.[5] A new and budding branch of pharmacology is Immunopharmacology which intends to search for immunomodulators. In clinical medicine, immunodulator’s possible practices encompasses the improvement or reinstatement of immune insufficiency so as to help against infections i.e. for the management of AIDS or the suppression of regular or excessive immune function for the prevention of rejection or reaction against transplanted organ or in autoimmune disease. [2,6] Immunization is the process of introducing an antigen into the body to pledge shield against pathogens without instigating disease. The substances which are introduced to institute a defensive immune response are called vaccines which may be live, attenuated or killed. [7] www.wjpps.com Vol 4, Issue 08, 2015. 22 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences COMMON PLANTS WITH IMMUNOMODULATORY AGENTS Table: Some common plants with immunomudulatory agents with their specific parts used. [8] Some plant products with immunomodulatory and anthelmintic properties are discussed as follows 1. Nyctanthus arbor-tristis (Harsinghar): This plant is extensively used in traditional medicinal system in India and has been reported to contain antileishmanial, hepatoprotective, antiviral and antifungal activities. Strong stimulation of antigen specific and non-specific immunity, thereby increasing humoral and DTH response to SRBC and macrophage migration, has been established in mice and extreme activity was seen in the seeds. [9] 2. Picrorrhiza kurroa (kutali): P. kurroa is a favorable immunomodulatory agent. [10] It enhanced antibody and DTH response to RBCs of sheep in mice. Picroliv is an iridoid glycoside derived from this plant which significantly protected golden hamster against challenge with Leishmania donovani promastigote; its lethal effects (77%) had been seen in microfilariae of Litomosoides carinii in cotton rats.[11,12] 3. Cissampelos pareira (Akanadi): This plant is reported to have antiviral properties and is also effective against urinary tract infections. Other species like C. mucromata also have immunomodulatory and anthelmintic activities.[13] 4. Bauhinia variegate (Kachnar): This plant has been reported to have both immunomodulatory and anthelmintic activities. www.wjpps.com Vol 4, Issue 08, 2015. 23 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences 5. Blechnum orientale (Rajhans): This plant also has both immunomodulatory and anthelmintic activities. 6. Butea monosperma (Dhak): This native medicinal plant possesses immunostimulatory, antihelminthic, antibacterial and antiasthamatic properties. 7. Capparis zeylanica, Linn. Capparis zeylanica, Linn (family: Capparidaceae) is commonly called Indian caper, which is found throughout India and has been used as a ‘Rasayana’ drug in the traditional Ayurvedic system of medicine. ‘Rasayana’ plants are principally recommended for the treatment of immune disorders. [14] In Northern India, the leaves are widely used as counter-irritant, febrifuge and as a cataplasm in swellings, boils and piles. [15] Different species of Capparisare are valuable in the treatment of cough, asthma, inflammation, fevers, cholera and also as poultice in gout and rheumatism. [16] 8. Allium sativum: Garlic is acknowledged for the enhancement of the immune system since long and most of the research is dedicated to its organo-sulfur compound. Latest outcomes have shown that the antitumor effect of allyl sulfur compounds may be linked to their antiinflammatory and immunostimulatory actions. [17] While some immunomodulatory proteins from garlic have been defined, their characteristics are still unidentified. [18] 9. Tinospora cordifolia It is used in numerous native drug preparations for general health and other disease conditions, possessing anti-allergic, anti-hepatotxic, anti-diabetic and anti-pyretic characteristics (all green). Its alcoholic extract showed immunomodulatory activity on rats; produced substantial increase in the WBC count and bone marrow cells demonstrating stimulatory effect on haeomopoetic system. More research is underway soas to explore the cellular changes and other pharmacological and biotechnological investiga tion in male wister rat. [19] 10. Curcuma longa Turmeric has curcumin which reduces the proliferation and activation of T-cells. Curcumin treatment also increases the number of B-cell. [20] Reports have established that the aqueous extract of turmeric lessened the level of SGOT, SGPT and bilirubin in Carbon tetrachloride (CCl4) intoxicated mice. Apart from damaging the liver system, CCl4 also lessened various www.wjpps.com Vol 4, Issue 08, 2015. 24 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences non specific host response parameters like morphological alteration, phagocytosis, nitric oxide release, etc. Administration of its aqueous extract presented noteworthy defense from damaging actions of CCl4 on the non specific host response in the peritoneal macrophages of CCl4 intoxicated mice. [21] 11. Azadirachta indica Azadirachta indica belongs to family meliaceae and is well known in the sub continent for more than 2000 years as one of the most adaptable medicinal plants with wide spectrum of biological activity i.e. anti-inflammatory, anti-diabetic, antiviral, anticarcinogenic, immunostimultory, etc.[22-24] The immunomodulatory effect of Neem (Azadirachta indica) seed’s aqueous, ethanolic extracts and Candida albicans cell wall mannoproteins on the immune response of mice vaccinated with Brucella Rev-1 vaccine was studied. Aqueous and ethanolic Neem seed’s extract exhibited the highest augmentation in all immunological parameters engaged in comparison with mannoproteins of Candida albicans cell wall. [25] METHODOLOGY FOR REVIEW This is a review article composed after conducting a literature based survey from year 2000 to early 2014. More than 80 articles were carefully chosen and studied comprehensively, selected from different sources. [1-8, 11, 19, 24] Only those natural sources containing immunomodulatory effects/agents were selected that are native to Pakistan and their separation and isolation could be done easily in Pakistan. Among them, Allium sativum, Tinospora cordifolia, Curcuma longa, Capparis zeylania, etc. were studied in depth with the methods for their separation and isolation. DISCUSSION Few plants in Pakistan having immunomodulatory activities that can be extracted & separated with help of simple techniques. 1. Allium sativum It belongs to the family Lilliacea and it is generally known as Garlic. It is well-known for it is medicinal properties and originated in Central Asia. Garlic has been used in food and as medicine worldwide since antiquity. Today it is a famous constituent in culinary herb as well as has established antioxidant, anticancer and even immunomodulator. [26-31] www.wjpps.com Vol 4, Issue 08, 2015. 25 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences Method for separation: The three major proteins i.e. QA-1, QA-2, and QA-3, that demonstrate immunomodulatory properties are separated by using Q-Sepharose Chromatography technique from raw and aged garlic extracts.[8,32] Importance and uses: Allium sativum has noteworthy effects in the situations like Alzheimer’s disease, dermatologic infections, cardiovascular diseases (including atherosclerosis, strokes, hypertension, thrombosis and hyperlipidemias), stress, and microbial infections. It also holds anti-cancer activity. [28,31,33,34] Allicin is an active component which is isolated from garlic. It shows 4 main activities: antibacterial activity against Escherichia coli, antifungal activity against Candida albicans, antiparasitic activity against Entamoeba histolytica and Giardia lamblia, and also antiviral activity. [35] The diallyl sulfide (DAS) and thiacremonone in garlic have revealed having anti-arthritic properties and garlic extract has shown anti inflammatory properties as well. [33] The 1, 2-Vinyldithiin has shown anti adipogenic and anti inflammatory actions on human pre-adipocytes; hence considered as antiobesity nutraceutical. [36] 2. Tinospora cordifolia It belongs to the family Meninspermaceae and is generally known as Guluchi, Giloy etc. It is a widely used shrub in folk and ayurvedic systems of medicine. The chemical constituents of T. cordifolia belong to different classes that include alkaloids, steroids, glycosides, diterpenoid lactones, polysaccharides, aliphatic compounds, phenolics, and sesquiterpenoids.[37] Method for separation: The ripened T. cordifolia barks are freshly collected, cut, dried in shade and then powdered coarsely. Then the powder is defatted with petroleum ether at temperature 60 - 80°C and extracted through soxhlet extractor using hexane. The extract is dried under reduced pressure by rotary vacuum evaporator with 7% w/w percent yield and the extract is then stored in refrigerator.[38] Importance and uses: T. cordifolia is expressed and recommended as a monoherbal as well as polyherbal preparation. Although it is alcoholic but the aqueous extracts have been verified positively for immuno-modulatory activity. It is reported to impede the immunosuppressive effect of cyclophosphamide. [39-46] The shrub has been found to substantially reduce the deaths from E. coli induced peritonitis and also showed defense in cholestatic patients against E. coli infections. It is parallel to gentamicin and is also recognized for its hepato-protective www.wjpps.com Vol 4, Issue 08, 2015. 26 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences effects.[37,44,47] Significant anti-inflammatory effects in both acute and subacute models of inflammation have been reported for the dried stem of T. cordifolia.[37] Its herbal extract has revealed radio-protective prospective from gamma-irradiation. Its use as an adjunct to therapy for the following conditions has displayed substantial results: HIV, diabetic foot, free radical mediated injury and stress; it also possesses significant anti-tumor activity.[6,48-52] 3. Curcuma longa Curcuma longa belongs to the family Zingiberacea and is usually known as Saffron India, Haldi (Hindi), turmeric, etc. It is an extensively used herb in the folk and ayurvedic medicines. The chemical constituents contained in this herb are Essential oil (zingerberine) and curcuminoids (curcumin1 and curcumin III) as major constituents while the others include sesquiterpenes , ar-turmerone, ar-curcumene ,a-sabinene, borneol,cineole,myrcene and b-pinene, a-terpine, nelimonene, p-cymene, perillyl alcohol, turmerone, eugenol, isoeugenol, eugenol methyl ether and iso-eugenol methyl ether, Stigmasterol, cholesterol, Bsitosterol and fatty acids.[53-55] Method for separation: Curcumin is extracted from the dried root of the rhizome Curcuma Longa by grinding it into powder and washing with a suitable solvent that selectively extracts coloring material. After distillation, this procedure produces an oleoresin with coloring matter content of 25-35 % along with volatile oils and additional resinous extractives. This oleoresin is further subjected to washes with selective solvents to extract the Curcumin pigment. This process yields a powdered, purified food color, known as Curcumin powder, having more than 90% coloring matter and very diminutive amount of volatile oil and other dry stuff of natural source. The solvents employed for extraction include acetone, methanol, isopropanol and ethanol.[56-58] Importance and uses: The immunomodulator Curcumin is used potentially for the formulation of an adjunct therapy against cerebral malaria. Recent studies have validated scientific confirmation regarding its prophylactic and therapeutic prospective, straightening out its anti-inflammatory, anti-carcinogenic, and anti-infectious activities, and also its spasmolytic, CNS stimulant, anti-parasitic, antispasmodic and anti-arthiritic properties. [59-65] 4. Capparis zeylania Traditionaly Capparis zeylania L. was first time reported for use as a vegetable.[66] Its contemporary phytochemical screening has revealed the occurrence of fatty acids and www.wjpps.com Vol 4, Issue 08, 2015. 27 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences flavonoids in the leaves.[67,68] Flavonoids have been identified to have antioxidant, antineoplastic, antiulcer, anti-inflammatory and antimicrobial actions.[69,70] Method for separation For the preparation of extract, 500gm of dried coarse powdered plant were charged into soxhlet’s apparatus (hot extraction) and successively with petroleum ether (600- 800C), chloroform, etyalcetate and methanol in order of their increasing polarity. The successive methanolic extract deep brown colour) was filtered and dried under reduced pressure to get a solid mass free from the solvent. The yield was 6.9% with respect to dry starting materials with characteristic odour & greasy consistency.[83] Importance and uses Root bark is ground with water, boiled and taken orally to treat indigestion.[71] Traditionally it is used as Antidote to snake bite, to cure swelling of testicle, small pox, boils, cholera, colic, hemiplagia, neuralgia, sores, pneumonic and pleurisy.[72-75] Leaf and stem parts are as spasmolyte. [76] Root bark preparation is used as a sedative.[77] Leaves extract of Capparis zeylania L. with black pepper powder is taken twice daily for the treatment of dysentery. [78] Leaves’ juice of Capparis zeylania L. is taken orally with cup of fresh goat milk for curing cough and cold. [79] For the treatment of diabetes ripened fruits are consumed twice fortnightly and during ingestion, stem bark extract is administered thrice daily.[80] Capparis zeylania L. plant is also served as an appetizer prepared as a dipping paste with pepper, tamarind and garlic.[81] Grind the stem bark by adding 10 seeds of black pepper, 2 bulbs of garlic and mix it into 500ml water; given twice daily for two days to cure colic. Handful fresh roots, 50g onions, 50g jaggery are ground all together and made into a bolus; feed Capparis zeylania L. twice daily for 3 days to cure convulsive seizures.[82] 5. Azadirachta indica The Neem (Azadirachta indica A. Juss) tree, belonging to the Meliaceae family, possesses various insecticidal compounds against a range of agricultural insect pests. Neem contains numerous biologically active chemicals called limonoids such as Azadirachtin A, nimbin, salannin, azadirachtol, nimbidin, gedunin, etc. which are accountable for miscellaneous activities such as insect anti-feedant, insect growth disruption, insecticidal, nematicidal, fungicidal, bactericidal etc.[84,85] www.wjpps.com Vol 4, Issue 08, 2015. 28 Yasin et al. World Journal of Pharmacy and Pharmaceutical Sciences Method for separation: Cold Maceration Method was used for extraction in which the dried leaves were blended into powder and one liter of ethanol was used as extracting substance. Homogeneity of the mixture was confirmed by stirring the mixture regularly and the mixture was allowed to stand for 3 days for maximum extraction prior to filtration. The filtrate was heated in a round bottom flask balanced on a hot water bath, which made the extract concentrated.[86] Importance and uses: Neem tree yields are used for many medicinal and agricultural purposes. It is largely used as herbal medicine in its native countries and is used in many pharmaceutical and cosmetic products; also for pest control in homes. Their leaves’ paste is a valuable management for skin injuries. Small parts of leaves mixed with regular feed may affect intestinal parasites in livestock.[87] CONCLUSION Important herbal immunomodulators with minimal side effects need more exploration as clinical potential to be used as medicine in future. Many plants with potential immunomodulatory properties have been conferred in this review. Chief highlights of this review are on the account of immunomodulators with phytochemical compounds and their pertinent mechanism of action. This may aid in recommending principal compounds from natural resources for drug development and instituting their effectiveness from customary resources. REFERENCES 1. Allison AC. Immunological adjuvants and their mode of actions. Arch Immunol Ther Exp (Warsz), 1997; 45(2-3): 141-47. 2. 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