Review of Literature 2.1 Introduction Numerous disease prevailing in the society can be treated using medicines. Various parts of plants such as leaf, stem, roots and barks were used as medicines in auyrveda, siddha, unani and homeopathic treatments. In Ayurveda: The Argemone mexicana linn. is useful in guineaworm infestations, purgative and diuretic. Seeds of the plant are used as an antidote in snake poisoning and also acts as an emetic, expectorant, demulcent and laxative. The protein-dissolving substances containing seed extract is used to cure warts, cold sores, cutaneous infections, itches, jaundice and dropsy 1. Seeds are effective against skin infection, sores, dropsy and jaundice 2. Juice of the plant cures ophthalmic and opacity of cornea. Oil of the seed is used to treat skin diseases. Roots are antihelmentic and also used in, skin diseases, leprosy and inflammations3. In Homeopathic medicine: The drug prepared from this plant is very useful in treating the problem caused by tape worm. The whole plant is reported to be used for the treatment of whooping cough and bronchitis 4. In Unani medicine: Argemone Mexicana linn. helps in the enrichment of blood which acts as an expectorant and aphrodisiac. It is also used in treating skin diseases and leucoderma 5. In siddha medicine: Argemone Mexicana linn. is widely used to cure venereal sores, scorpion bite,photophobia, leucorrhoea. Leaves along with black pepper are used to cure diabetes. The latex of A. mexicana used to treat boils by topical application on the site of boils. Whole plant is used to treat dental disorders. Leaf decoction is used in the treatment of malarial fever and ulcers. Juice of the plant is applied 13 Review of Literature on scorpion sting. Seeds are effective against leprosy, jaundice and dropsy 6. 2.2 Antimicrobial activity Acetone, ethyl acetate and petroleum ether extracts of leaf and stem of Argemone Mexicana linn. was tested against as E. coli, Shigella sp., Staphylococcus sp. and Salmonella sp. for their antibacterial and antifungal properties. Excellent activity was exhibited by petroleum ether extract of both leaf and stem, ethyl acetate extract for both leaf and stem showed moderate activity and the acetone extracts were found inactive against these water borne pathogens 7. Singh et al in 2009 have reported antibacterial property of different seed extracts viz. n-hexane, chloroform, methanol and water. It was found that chloroform extract exhibited excellent results against all the bacterial and fungal strains along with multidrug resistant P. aeruginosa and S.aureus. It was found that methanol extract exhibited moderate activity against all the microbial strains. However, no activity was reported against all the pathogens for n-hexane and aqueous extracts8. Crude extracts of methanol and cold water of both leaves and seeds of Argemone mexicana linn. were tested against multi drug resistant pathogenic bacterial strains. The activity was carried our using agar plate diffusion method. Both the extracts were found to exhibit excellent activity9. Argemone mexicana linn. oil extracted from bark and root exhibited positive acivity against S. aureus, B. subtilis, K. pneumoniae, P. aeruginosa, C. albicans, C. stellatoidea and C. torulopsis. It posses efficacy in inhibition of growth of selected bacteria and fungi among the tested organism.10 14 Review of Literature N-dimethyloxysanguinarine isolated from chloroform extract of A. mexicana showed antibacterial activity against K. pneumonia, S. aureus, E. coli and P. aeroginosa with minimum inhibitory concentration of 1.5625 to 3.125 11. The extract of alcohol and petroleum ether from aerial parts of Argemone mexicana linn. were evaluated for antimicrobial activity against two bacterial strains (gram positive and negative), Bacillus subtilis and Escherichia coli. Both extracts showed very good antimicrobial activity on the pathogens. Comparatively alcohol extract showed higher activity than petroleum ether extract 12. 2.3 Antidiabetic activity Rout et al in 2011 reported hypoglycemic potentiality of aerial parts of Argemone mexicana linn. in Alloxan induced diabetic rats. Treatment was given for 11 days with ethanol and aqueous extracts at a dose of 200 and 400 mg/kg body weight in diabetic rats. Treatment of aqueous extract (400 mg/kg body weight) exhibited significant reduction in blood glucose levels, triglyceride, cholesterol, plasma urea, creatinine values and recovery in body weight compared to diabetic control rats and the standard drug treated rats 13. Ariel parts of the plant Argemone mexicana linn. were extracted in water-alcohol mixture (200 and 400 mg/kg body weight), resulted in reducing fasting blood glucose levels in Streptozotocin induced hyperglycemic wistar albino rats14. 2.4 Antioxidant activity Different extracts of Argemone mexicana linn. leaves were found to possess super oxide anion scavenging activity by nitro blue tetrazolium assay. Even at the dosage of 200 μg/ml; all the extracts exhibited maximum percentage of antioxidant property. The highest 15 Review of Literature radical scavenging activity was exhibited by acetone extract whose IC50 value was double to that of L-ascorbic acid value15. Ethanolic extract of Argemone mexicana linn. root is reported to show high DPPH radical scavenging activity (85.17%), ABTS radical scavenging activity (75.27%) and H2O2 radical scavenging activity (84.25%) at 100 μg/ml concentration. Extract showed dose dependent high free radical scavenging activity 16. 2.5 Anti malarial activity Malaria was treated with a potential, dose-escalating, quasiexperimental clinical trial method with a traditional healer using a decoction of Argemone mexicana linn.. The remedy was prescribed in three regimens: once daily for 3 days to group A; twice daily for 7 days to group B; and four times daily for the first 4 days followed by twice daily for 3 days to group C. All presented to the traditional healer with symptoms of malaria and had a Plasmodium falciparum parasitaemia >2000/μl but no signs of severe malaria. The proportions of adequate clinical response (ACR) at Day 14 were 35%, 73% and 65% in Groups A, B and C, respectively (P = 0.011). At Day 14, overall proportions of ACR were lower in children aged <1 year (45%) and higher in patients aged >5 years (81%) (P = 0.027). Very few patients had complete parasite clearance, but at Day 14, 67% of patients with ACR had a parasitaemia <2000/μl17. 2.6 Wound Healing activity Different solvent extract of Ar gemone mexicana linn. leaves were examined for wound healing activity in wistar albino rats. The activity was carried out by excision, incision and dead space wound models. The results showed that the treatment with methanol extract of leaves of Argemone mexicana linn. accelerated wound healing agent in rats18. 16 Review of Literature The wound healing effects of the leaf extract (50% ethanol) and latex of Argemone mexicana linn. were investigated on albino rats using both excision and incision wound models. Topical application of the extract and latex, respectively, gave 67.08 and 57.86% healing after 12 days in the excision model and increased tensile strength to 188.50 and 154.61 gm in the incision model. However, both the extract and latex of Argemone mexicana linn. were not as effective as the standard nitrofurazone in both excision and incision models 19. 2.7 Hepatoprotective activity Extracts of root bark of Argemone mexicana linn. were investigated on CCl4 (Carbon tetra Chloride) induced liver damaged in rats. Acute toxicity study, efficacy study, blood and tissue biochemical assays like ALT, AST, bilirubin, total protein, glucose, LM and EM etc have been studied for evaluation of Hepatoprotective action. From above observations of biochemical parameters it was observed that Argemone mexicana linn. has a high potential in healing liver parenchyma and regeneration of liver cells hence it may act as a liver tonic with high potency20. The protective effects of the aqueous extract of Argemone mexicana linn. whole plant; against CCl4 induced hepatic failure in male albino rats (Wistar strain) was investigated. For acute and massive invasion of hepatopathy, CCl4 (i.p injection of CCl4+Olive Oil in 1:1 ratio; 2ml/kg) was used and various biochemical parameters followed by significant (p<0.001) weight loss in toxic control group (-12.83±1.13). The administration of aqueous extracts (250mg/kg and 150mg/kg of body weight) for 7 days, elicited protective action since the elevated levels of marker enzymes (AST, ALT, ALP) of liver functions were found to be decreasing progressively in a dose dependent manner with net weight gain. In the aqueous extract, 250mg/kg treated rat group all the marker enzymes were analysed to be decreasing significantly 17 Review of Literature (p<0.001), (AST, 272.77±24.08; ALT, 189.15±7.16; ALP, 97.15±6.54) and the final body weight was also significantly (p<0.001) increased (6.16±1.01) when compared with the toxic control group. The serum total protein and the serum albumin were also approaching normal values. The results found in aqueous extract 250mg/kg treated rat were quite promising and were comparable with a standard polyherbal drug Liv-52. The statistically processed results support the conclusion, that the aqueous extract of Argemone mexicana linn. whole plant (250mg/kg and 150mg/kg) possesses dose dependent, significant protective activity against CCl4 induced hepatotoxicity 21. 2.8 Antihelmintic activity Alcoholic and aqueous extract of leaves of Argemone mexicana linn. were tested for antihelmintic activity in a dose dependent manner (6.25, 12.5, 25, 50, 100 mg/ml) against Pheretima posthuma and Ascardia galli. Both the extracts were found to posses significant antihelmintic activity at 100 mg/ml concentration 22. 2.9 Antiplasmodial activity Among the different species exhibiting low IC50 value between 943 mg (dry extract) / ml pertaining to posses good antiplasmodium property, Argemone mexicana linn. (Papavaraceae) also showed the same activity which varied by varying extract dose per kg/body wt. concentration: In vitro inhibition (%) of plant extracts against chloroquine susceptible strain of P. falciparum. The result showed mg dry extract / 80 mg part dry plant material 2.50, % Inhibition (mg:ml) according to dose i.e. 100 μg/ml (87); 50 μg/ml (76); 25 μg /ml (60); 12.5 μg /ml (51); and IC50 μg /ml 23. 18 Review of Literature 2.10 Larvicidal activity Acetone fraction of petroleum ether extract of Argemone mexicana linn. seed was reported to possess larvicidal activity. Extract resulted in 100% mortality of the larva with LC50 value of 13.58 and 17.43 in field and laboratory conditions respectively 24. Acetone fraction of the petroleum ether extract of seeds of Argemone mexicana linn. exhibited larvicidal and growth inhibiting activity against the second instar larvae of Aedes aegypti25. The leaf extract (in petroleum ether) of the plant also exhibits high larvicidal potential with LC50 value of 48.89 ppm against 3rd -4th instar larvae of Culex quinquefasciatu26. 2.11 Anticancer activity The ethanol extract of Argemone mexicana linn. was reported to exhibit inhibitory activity against human cancer cell lines such as HelaB75 (48%), HL-60 (20.15%) and PN-15 (58.11%) 27. 2.12 Vasorelaxant activity The vascular effects of a methanolic extract of the aerial part Argemone mexicana linn. was investigated in rat aormatic rings. The extract produced relaxation from contraction induced by norepinephrine (NE: 1X10-7 M) in a concentration-dependent manner (0.1 at 1000 μg/ml). At higher concentrations (310 and 1000 μg/ml), the extract induced significant additional tension. When applied to relaxed aortic tissue, addition of the extract produced concentration dependent contraction. Vasoconstrictor and vasorelaxant effects produced by the extract, were not altered significantly in endothelium-denuded rings, however, phenoxi- benzamine (1 mg/ml) produced a rightward shift in the concentration–contractile response curve to the extract. On the other 19 Review of Literature hand, the extract relaxed significantly the contraction induced by KCl (40 mM). The results indicate that the extract induces a direct dual specific effect upon the vascular smooth muscle, mediated, at least in part, by adrenergic receptors 28. Petroleum ether, CHCl3, CHCl3/MeOH (9:1), MeOH extract and partially purified fractions and pure compounds from Argemone mexicana linn. examined on the electrically induced contractions of the isolated guinea-pig ileum (E.C.I.). The results of the experiments indicate that CHCl3/MeOH (9:1) and MeOH extracts, tested at a concentration of 400, 200 and 100 mg/mL, dose-dependently reduced the guinea-pig ileum contractions, whereas the petroleum ether and CHCl3 extracts did not affect it. Furthermore, the partially purified fractions II-V from the MeOH extract, each tested at concentrations of 200, 100 and 50 mg/mL also inhibited E.C.I. Finally the pure compounds 1-2 isolated and purified from the above fractions significantly reduced, in a dose dependent manner, the electrical contractions of the ileum, whereas compound 3 increased them. Since the active compounds 1-3 were respectively identified as protopine, allocryptopine and berberine by NMR, the observed effects could be related mainly to these compounds 29. 2.13 Antiasthmatic activity Manuscript published in 2007 by Rao et al showed the significance of Argemone mexicana linn. (Papaveraceae) (common or local name: Brahmadand) Seed powder as antiasthamatic if taken 100– 200 mg twice a day, for 2 weeks 30. 2.14 Cytotoxic activity The alkaloid isolated by fractionation of the chloroform extract from the aerial part of Argemone Mexicana linn. was evaluated for its cytotoxicity to human nasopharyngeal carcinoma (HONE-1) and human 20 Review of Literature gastric cancer (NUGC) cell lines. Chelerythrine was found to exhibit significant activity against NUGC cell line, while angoline inhibited both types of cell lines. (+)-Argenaxine showed moderate activity against the NUGC cell line 31. 2.15 Anti-HIV activity Anti-HIV activity was conducted for the alkaloids extracted from the methanolic extracts of the Argemone mexicana linn. In which benzo[c]phenanthridine (+/-)-6-acetonyldihydro chelerythrine exhibited significant anti-HIV activity in H9 lymphocytes with EC50 and TI (Therapeutic Index) values of 1.77 μ /ml and 14.6, respectively 32. 2.16 Molluscicidal activity Molluscicidal property of seeds of Argemone mexicana linn. against snail Lymnaea acuminata was studied. It was observed that molluscicidal activity of seed powder of Argemone Mexicana linn., was both time and dose dependent. Protopine and sanguinarine in seed of Argemone mexicana linn. was identified as the active moiety causing snail death by co-migration of active agent with seed powder 33. 2.17 Neuropharmacological studies The ethyl acetate and methanol extract of the whole plant of Argemone mexicana linn. was reported for analgesic activity, locomotor activity and muscle relaxant activity using Wistar albino mice at an oral dosage of 100, 200 and 400 mg/kg body weight. Both extracts showed significant activities but methanol extract at a dosage of 200 mg/kg body weight was found to be more potent for central nervous system activities such as analgesic, anxiolytic and sedative effects 34. 2.18 Toxicity and safety evaluation The alkaloid sanguinarine isolated from seeds of Argemone mexicana linn. was examined for its hepatotoxic potential in rats. The 21 Review of Literature studies exhibited that a single i.p. dose (10 mg/kg) of sanguinarine not only increased the activity of SGPT and SGOT substantially but also caused a significant loss of microsomal cytochrome P-450 and benzphetamine N-methylase activity. Furthermore, the treated rats exhibited considerable loss of body and liver weight, peritoneal edema and slightly enlarged livers with fibrinous material. Microscopic examination of the liver tissue showed progressive cellular degeneration and necrosis further substantiating that sanguinarine is a potential hepatotoxic alkaloid 35. Toxicolethal effects of seeds of Argemone Mexicana linn. were investigated in to roof rat, (Rattus rattus L). The argemone seeds were fed at 100% of the diet up to the death or for a maximum of 10 days. Observed signs of poisoning were sedation, passiveness, sluggishness, feeble or no muscular jerks, abdominal contractions and increased defecation. Also black secretions from the eyes, corneal opacity, erection of hairs, and edema of the hind legs and submandibular space in were noted. Fourteen of sixteen rats died. Significant reduction in the weights of the rats was observed. There were significant increases in blood glucose, BUN and SGOT. Major histopathological lesions were: hepatocytolysis, nuclear degeneration, pyknosis, cloudy swelling and dilatated sinusoids disturbing the lobulalar architecture of the liver; proliferated endothelium of glomeruli, hemorrhage in glomeruli and interstitium, and cloudy swelling of convoluted tubular epithelium in the kidney cortical region; erosion and atrophy of the upper stomach mucosa and calcification in the cardiac stomach, and; erosion and congestion of the upper mucosa of the duodenum. No change was noticed in the ileum 36. Safety evaluation studies on argemone oil through dietary exposure for 90 days in rats: Epidemic dropsy is a disease caused by the consumption of mustard oil contaminated with argemone oil (AO). 22 Review of Literature During 1998 dropsy in New Delhi, which is so far the largest with more than 3000 victims and over 60 deaths, it was enquired at various scientific and regulatory meetings about the maximum tolerated dose of AO. Animals were given AO in diet at a dose of 0.001%, 0.01%, 0.1%, 0.5% and 1% daily for 90 days and the two control groups received the standard diet with and without 1% mustard oil. A decrease in body weight gain (28–31%) was observed in 0.5% and 1% AO groups; while significant increases in relative lungs and liver weight was noticed in respective doses of 0.01% and 0.1% AO groups as well as in higher dosage animals. Reduction in RBC count and haemoglobin content (p < 0.05) was noticed in 0.01% and 0.1% AO exposed animals. This effect was more pronounced in higher AO doses. Serum marker enzymes including alanine transaminase (ALT), aspartate transaminase (AST), lactate dehydrogenase (LDH) and alkaline phosphatase (ALP) were found to be significantly elevated in 0.01–1% AO groups. Further, a decrease in albumin/globulin ratio (42–78%) was observed in the serum of 0.01% to higher AO dose groups. The levels of serum triglycerides and VLDL cholesterol were found to be enhanced (p < 0.05) in AO treated (0.01–1.0%) animals. Histopathological changes in lung were observed at 0.01% dose of AO while liver, kidney and heart produced changes at 0.1% AO and above doses. None of the parameters were found to be affected in 0.001% AO treated animals. These results suggest that the no observed adverse effect level (NOAEL) dose of AO is 0.001% in rats and considering a factor of 100 for humans for highly toxic compound, the safe limit of 0.00001% (100 ppb or 100 ng AO/g oil) AO can be implicated which shall contain only 0.55% of sanguinarine equivalent to 0.6 ng sanguinarine per gram oil. However, the minimum detectable limit of AO is 5 ppm (equivalent to 5 ng sanguinarine per gram oil) with the 23 Review of Literature present existing HPLC method, thereby suggesting that mustard oil should be absolutely free from AO contamination 37. In vivo DNA damaging potential of sanguinarine alkaloid, isolated from argemone oil, using alkaline Comet assay in mice: Consumption of mustard oil contaminated with argemone oil is well known to cause clinical manifestation referred to as ‘‘Epidemic Dropsy’’. Since, sanguinarine alkaloid is the major component of argemone oil, the in vivo DNA damaging potential of the isolated alkaloid was investigated in blood and bone marrow cells of mice using alkaline Comet assay. Swiss albino male mice were given single intraperitoneal administration of 1.35, 2.70, 5.40, 10.80 and 21.60 mg sanguinarine alkaloid/kg bwt., while controls were treated with saline in the same manner. The results revealed a dose dependent increase in DNA damage in blood and bone marrow cells following 24h treatment of sanguinarine alkaloid. All the three parameters of Comet assay including olive tail moment (OTM), tail length and tail DNA showed significant (p < 0.05) increases in blood and bone marrow cells at respective doses of 10.80 and 5.40 mg alkaloid/kg . However, some of the parameters were significantly increased even at lower doses of sanguinarine alkaloid (2.70 mg/kg). The frequency of cells exhibiting greater DNA damage was found to be increased by sanguinarine alkaloid in a concentration dependent manner. These results indicate that single exposure of sanguinarine alkaloid causes DNA damage in blood and bone marrow cells of mice, which could be responsible for the genotoxicity of argemone oil. The present study clearly indicates that sanguinarine alkaloid, an active ingredient of argemone oil possesses DNA damaging potential in blood and bone marrow cells using alkaline Comet assay. These results fully support the earlier observation that in vivo argemone oil caused genotoxicity by enhancing the frequencies of chromosomal 24 Review of Literature aberrations, micronuclei formation and development of Comets resulting in DNA damage34. In this regard studies have shown that sanguinarine forms DNA adducts following metabolism by cytochrome P-450 system under in vitro conditions 38. It has been suggested that sanguinarine may undergo Ndemethylation by cytochrome P-450. Since, sanguinarine has been shown to cause inactivation of cytochrome P-450, it can be argued that the N-demethylated product of sanguinarine or any other electrophilic metabolite, could be responsible for this effect. The decrease in cytochrome P-450 thereby impairs the elimination of a metabolite of sanguinarine, identified as benzacridine, in urine and feces. Although, minimum group of sanguinarine has been shown to have affinity with bform duplex DNA by intercalation with a high preference to GC base pairs nonetheless, it could not reveal genotoxicity in SOS chromtest using E. coli PQ37 in the absence and presence of metabolic activation system. However, it raised the possibility of usage of Sanguinaria extract in toothpaste in the development of oral leukoplakia 39. 25 Review of Literature References 1. Chopra RN, Nayar SL and Chopra IC: Glossary of Indian Medicinal plants, Council of Industrial Research, New Delhi,1986. 2. Jyothi AC, Santosh JP and Ganes PB: Screening of aqueous plant extracts against Beauveria Bassiana infection to 5th instar larvae of Bombyx mori L. Journal of Medicinal plants Research 2011; 5:39363939. 3. Osho A, Adentunji T: Antimicrobial activity of the essentialoil Argemone mexicana linn. Journal of Medicinal plant Research 2010; 4:19-22. 4. 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