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      Pomegranate Fruit as a Rich Source of Biologically Active Compounds

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          Abstract

          Pomegranate is a widely used plant having medicinal properties. In this review, we have mainly focused on the already published data from our laboratory pertaining to the effect of methanol extract of pericarp of pomegranate (PME) and have compared it with other relevant literatures on Punica. Earlier, we had shown its antiproliferative effect using human breast (MCF-7, MDA MB-231), and endometrial (HEC-1A), cervical (SiHa, HeLa), and ovarian (SKOV3) cancer cell lines, and normal breast fibroblasts (MCF-10A) at concentration of 20–320  μ g/mL. The expressions of selected estrogen responsive genes (PR, pS2, and C-Myc) were downregulated by PME. Unlike estradiol, PME did not increase the uterine weight and proliferation in bilaterally ovariectomized Swiss-Albino mice models and its cardioprotective effects were comparable to that of 17 β -estradiol. We had further assessed the protective role of PME on skeletal system, using MC3T3-E1 cells. The results indicated that PME (80  μ g/mL) significantly increased ALP (Alkaline Phosphatase) activity, supporting its suggested role in modulating osteoblastic cell differentiation. The antiosteoporotic potential of PME was also evaluated in ovariectomized (OVX) rodent model. The results from our studies and from various other studies support the fact that pomegranate fruit is indeed a source of biologically active compounds.

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          Antioxidant activity of pomegranate juice and its relationship with phenolic composition and processing.

          María I. Gil, Francisco Tomás-Barberán, Betty Hess-Pierce … (2000)
          The antioxidant activity of pomegranate juices was evaluated by four different methods (ABTS, DPPH, DMPD, and FRAP) and compared to those of red wine and a green tea infusion. Commercial pomegranate juices showed an antioxidant activity (18-20 TEAC) three times higher than those of red wine and green tea (6-8 TEAC). The activity was higher in commercial juices extracted from whole pomegranates than in experimental juices obtained from the arils only (12-14 TEAC). HPLC-DAD and HPLC-MS analyses of the juices revealed that commercial juices contained the pomegranate tannin punicalagin (1500-1900 mg/L) while only traces of this compound were detected in the experimental juice obtained from arils in the laboratory. This shows that pomegranate industrial processing extracts some of the hydrolyzable tannins present in the fruit rind. This could account for the higher antioxidant activity of commercial juices compared to the experimental ones. In addition, anthocyanins, ellagic acid derivatives, and hydrolyzable tannins were detected and quantified in the pomegranate juices.
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            Punica granatum (pomegranate) and its potential for prevention and treatment of inflammation and cancer.

            Ephraim Lansky, Robert A. Newman (2007)
            The last 7 years have seen over seven times as many publications indexed by Medline dealing with pomegranate and Punica granatum than in all the years preceding them. Because of this, and the virtual explosion of interest in pomegranate as a medicinal and nutritional product that has followed, this review is accordingly launched. The pomegranate tree, Punica granatum, especially its fruit, possesses a vast ethnomedical history and represents a phytochemical reservoir of heuristic medicinal value. The tree/fruit can be divided into several anatomical compartments: (1) seed, (2) juice, (3) peel, (4) leaf, (5) flower, (6) bark, and (7) roots, each of which has interesting pharmacologic activity. Juice and peels, for example, possess potent antioxidant properties, while juice, peel and oil are all weakly estrogenic and heuristically of interest for the treatment of menopausal symptoms and sequellae. The use of juice, peel and oil have also been shown to possess anticancer activities, including interference with tumor cell proliferation, cell cycle, invasion and angiogenesis. These may be associated with plant based anti-inflammatory effects, The phytochemistry and pharmacological actions of all Punica granatum components suggest a wide range of clinical applications for the treatment and prevention of cancer, as well as other diseases where chronic inflammation is believed to play an essential etiologic role.
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              Anti-inflammatory properties of a pomegranate extract and its metabolite urolithin-A in a colitis rat model and the effect of colon inflammation on phenolic metabolism.

              Mar Larrosa, Antonio González-Sarrías, María Yáñez-Gascón … (2010)
              Whether the beneficial effects of pomegranate are due to the ellagitannins or to their microbiota-derived urolithins is not known. Our objectives were to evaluate the effects of pomegranate intake and its main microbiota-derived metabolite urolithin-A (UROA) on colon inflammation and to assess whether UROA is the main anti-inflammatory compound. In addition, the effect of the inflammation on the phenolic metabolism was also explored. Male Fisher rats were fed with 250 mg kg(-1) day(-1) pomegranate extract (PE) or 15 mg kg(-1) day(-1) UROA for 25 days. Dextran sodium sulfate (5%) (DSS) was administered for the five last days and then rats were euthanized. DSS is a well-known model of inflammatory bowel disease. Colon tissue damage, microbiota changes, antioxidant status, prostaglandin E(2) (PGE(2)), nitric oxide production, inducible nitric oxide synthase (iNOS), prostaglandin E synthase (PTGES), gene expression (microarrays and RT-PCR) and polyphenol metabolism (LC-MS-MS) were evaluated. Both PE and UROA decreased inflammation markers (iNOS, cycloxygenase-2, PTGES and PGE(2) in colonic mucosa) and modulated favorably the gut microbiota. The G(1) to S cell cycle pathway was up-regulated in both groups. UROA group showed various down-regulated pathways, including that of the inflammatory response. PE, but not UROA, decreased oxidative stress in plasma and colon mucosa. Only UROA preserved colonic architecture. The normal formation of urolithins in PE-fed rats was prevented during inflammation. Our results suggest that UROA could be the most active anti-inflammatory compound derived from pomegranate ingestion in healthy subjects, whereas in colon inflammation, the effects could be due to the nonmetabolized ellagitannin-related fraction. Copyright 2010 Elsevier Inc. All rights reserved.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Biomed Res Int
                Journal ID (iso-abbrev): Biomed Res Int
                Journal ID (publisher-id): BMRI
                Title: BioMed Research International
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 2314-6133
                ISSN (Electronic): 2314-6141
                Publication date (Print): 2014
                Publication date (Electronic): 10 April 2014
                Volume: 2014
                Electronic Location Identifier: 686921
                Affiliations
                Cancer Research Program, Rajiv Gandhi Centre for Biotechnology, Thycaud P.O, Thiruvananthapuram, Kerala 695 014, India
                Author notes

                Academic Editor: Kota V. Ramana

                Article
                DOI: 10.1155/2014/686921
                PMC ID: 4000966
                PubMed ID: 24818149
                SO-VID: c2f2e394-b609-4a6c-8c54-cc9f55ab333f
                Copyright © Copyright © 2014 Sreeja Sreekumar et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 21 November 2013
                Date revision received : 25 February 2014
                Date accepted : 25 February 2014
                Categories
                Subject: Review Article

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