Abstract
Plants have been employed as medicine since time immemorial, and there has been a recent resurgence in the use of plants as medicines due to their little or no toxicity at the doses used for treatment of different ailments. This review discusses in detail the phytochemical and pharmacological activities of Jamun (Syzygium cumini), a tree belonging to family Myrtaceae, which has been credited with several medicinal properties in the traditional system of medicine, the Ayurveda. The different properties attributed to Jamun are sweet, sour, astringent, acrid, refrigerant, carminative, diuretic, and digestive. Research and practical use in traditional medicinal systems have found Jamun to be effective in treating leucorrhoea, gastric disorders, fever, diabetes, piles, stomachache, wounds, and dental, digestive and skin disorders. Some compounds in Jamun have antioxidant, antimicrobial, antiallergic, antidiabetic, antihyperlipidemic, anticancer, gastroprotective, hepatoprotective, cardioprotective and radioprotective activity. Finally, Jamun has been found to contain phytochemicals including anthroquinones, alkaloids, catechins, flavonoids, glycosides, steroids, phenols, tannins, saponins and cardiac glycosides. The diverse activities of Jamun may be due to its abilities to scavenge free radicals, increase antioxidant status of cells by increasing glutathione, glutathione peroxidase, catalase and/or superoxide dismutase, and to attenuate lipid peroxidation. In addition, it also suppresses the transcription of peroxisome proliferator-activated receptor, Nuclear factor kappa B, cyclooxygenase, inducible nitric oxide synthase, tumor necrosis factor alpha and other proinflammatory cytokines, accompanied by the up-regulation of nuclear factor erythroid 2-related factor 2 transcription, which is involved in regulating the antioxidant status of the cells.
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