Current Trends in <strong>Biotechnology</strong> <strong>and</strong> <strong>Pharmacy</strong>Vol. 5 (1) 1073-1082 January 2011. ISSN 0973-8916 (Print), 2230-7303 (Online)1079peroxidase <strong>and</strong> glutathionetransferase, is readilyavailable to neutralize the free radicals generatedby t-BHP.SOD catalyses the depletion <strong>of</strong> thesuperoxide radical <strong>and</strong> protects oxygenmetabolizingcells against harmful effects <strong>of</strong>superoxide free radicals. Some types <strong>of</strong> SODlike MnSOD which contains a manganeseprosthetic group, resides in the mitochondria,perhaps because <strong>of</strong> the need to protectmitochondrial proteins, membranes, <strong>and</strong> DNAfrom . O 2generated as a result <strong>of</strong> the respiratorychain. Figure 5 showing total SOD levels in humanerythrocytes with reference to sub fraction F2-3.SOD levels in 12.5 µg/ml treated group at thetime intervals <strong>of</strong> 0, 30, 60, 90 min, t-BHP-control<strong>and</strong> control were 1.2, 1.9, 3, 3.23, 1.85 <strong>and</strong> 11.02IU/g Hb protein at the concentration <strong>of</strong> 25 µg/mlMDA, SOD levels were 1.22, 2.5, 5.2 <strong>and</strong> 5.2<strong>and</strong> at the concentration <strong>of</strong> 50 µg/ml SOD levelswere 1.1, 5.3, 9.4 <strong>and</strong> 9.7 IU/g Hb, respectively(Fig.5).CAT, a soluble protein in erythrocytes, playsa role in the decomposition <strong>of</strong> hydrogen peroxideto give H 2O. In humans, the highest levels <strong>of</strong>Fig. 5. Effect <strong>of</strong> fraction F2-3 on t-BHP induced oxidativestress in erythrocytes was monitored by measuringthe superoxide dismutase activity. Results are mean ±SD.catalase are found in liver, kidney <strong>and</strong> erythrocytes,where it is believed to account for the majority <strong>of</strong>hydrogen peroxide decomposition. Figure 6showing catalase activity in human erythrocyteswith reference to FME sub fraction F2-3. CATlevels in 12.5 µg/ml treated group at the timeintervals <strong>of</strong> 0, 30, 60, 90 min, t-BHP-control <strong>and</strong>control were 50.1, 55.4, 61.8, 62.4, 53.9 <strong>and</strong> 99.78µmol H 2O 2/g Hb/min. at the concentration <strong>of</strong> 25µg/ml MDA levels were 52.8, 60.9, 72.3 <strong>and</strong> 76.6<strong>and</strong> at the concentration <strong>of</strong> 50 µg/ml MDA levelswere 51.1, 62.5, 98.3 <strong>and</strong> 100.7 µmol H 2O 2/g Hb/min., respectively (Fig.6). Since both the enzymesSOD <strong>and</strong> CAT are directly involved in theneutralization <strong>of</strong> free radicals, these enzymes playa pivotal role in the oxidative stress. Theseenzyme levels were significantly reduced in t-BHPtreated groups indicating that antioxidant ability<strong>of</strong> the erythrocytes are reduced in t-BHP treatedgroup. Since these enzymes are replenished inresponse to F2-3 fraction <strong>of</strong> the fruit, erythrocytesagain gained the antioxidant potentials to combatagainst the free radicals generated in the variousmetabolic reactions.The present findings show that L.acutangula fruit aqueous fraction F2-3pretreatment attenuated t-BHP induced lipidperoxidation in human erythrocyes. Specifically,fraction F2-3 prevented t-BHP induced increasesin MDA levels, <strong>and</strong> concomitantly restored GSHcontent, SOD <strong>and</strong> CAT activity in erythrocytes,though to a different degrees. These effects mayreflect the ability <strong>of</strong> fraction F2-3 to enhance thescavenging <strong>and</strong> inactivation <strong>of</strong> H 2O 2<strong>and</strong> hydroxylradicals. In addition, fraction F2-3 may serve asa chealator <strong>and</strong> directly bind to Fe 2+ , whichcatalyzes formation <strong>of</strong> free radicals via the Fentonreactions (28, 29). Fraction F2-3 may alsoterminate lipid peroxidation by induction <strong>of</strong>enzymatic <strong>and</strong> non-enzymatic antioxidants, suchas GSH, SOD <strong>and</strong> CAT (30). Accordingly, theRole <strong>of</strong> Luffa acutangula in Oxidative damage
Current Trends in <strong>Biotechnology</strong> <strong>and</strong> <strong>Pharmacy</strong>Vol. 5 (1) 1073-1082 January 2011. ISSN 0973-8916 (Print), 2230-7303 (Online)1080protection afforded by fraction F2-3 against t-BHP induced ROS generation is likely attributableto its antioxidant effects.In conclusion, L. acutangula methanolicextract fraction F2-3 showed significantantioxidant activity in human erythrocytes <strong>and</strong>further studies are required to elucidate thefraction components <strong>and</strong> their molecularmechanism. Systemically, superoxides could beproduced in huge amounts by various metabolic<strong>and</strong> physiological processes (31, 32, 33). Theformation <strong>of</strong> superoxide radical leads to a cascadeformation <strong>of</strong> other ROS in the cell, whenever theantioxidant system fails to combat with ROS thatcan cause to lethal damage to the system (34).Hence, our data for the first time reports theoxidative stress inhibitory property <strong>of</strong> the L.autangula fruit. So that it may help to preventdiseases caused by the ROS. However, one thingwe should consider that antioxidant activity maydiffer from organism to organism because <strong>of</strong> thegenetic configurations to respective antioxidantmechanism (16). So we can expect less or moreactivity from different organism.Fig. 6. Eeffect <strong>of</strong> fraction F2-3 on t-BHP inducedoxidative stress in erythrocytes was monitored bymeasuring the activity levels <strong>of</strong> catalase. Results areMean ± SD.AcknowledgementsThis study was supported by Financial support(Senior Research Fellowship) from CSIR, NewDelhi, India.Reference1. Herbette Stephane, Roeckel-DrevetPatricia <strong>and</strong> Drevet, Joel R. (2007). Selenoindependentglutathione peroxidases: Morethan simple antioxidant scavengers. FEBSJ., 274: 2163-2180.2. Mc Cord, J.M. <strong>and</strong> Fridovich, I. (1969).Superoxide dismutase an enzymic functionfor erythrocuprein (hemocuprein). J BiolChem., 244: 6049-55.3. Marian, V. (2007). Free radicals <strong>and</strong>antioxidants in normal physiologicalfunctions <strong>and</strong> human disease. Int JBiochem, Cell Biol., 39: 44–84.4. Aygul, R., Demircan B. Erdem .F, Ulvi, H.,Yildirim, A. <strong>and</strong> Demirbas, F. (2005).Plasma Values <strong>of</strong> Oxidants <strong>and</strong>Antioxidants in Acute Brain Hemorrhage:Role <strong>of</strong> Free Radicals in the Development<strong>of</strong> Brain Injury. Biol Trace Elem Res.,108(1-3): 43-52.5. Ji, L. (2007). Antioxidant signaling in skeletalmuscle: A brief review. Exp Gerontol., 420:582–593.6. Bravo, L. (1998). Polyphenols: Chemistry,dietary sources, metabolism, <strong>and</strong> nutritionalsignificance. Nutr Rev, 56: 317-333.7. Chung, K.T., Wong, T.Y., Wei, CI., Huang,Y.W. <strong>and</strong> Lin, Y. (1998). Tannins <strong>and</strong> humanhealth: a review. Crit Rev Food Sci Nutr,38: 421-464.8. Crozier, A., Burns, J., Aziz, A.A., Stewart,A.J., Rabiasz, H.S., Jenkins, G.I., Edwards,C.A. <strong>and</strong> Lean Mej. (2000). AntioxidantPurushotham Reddy et al.