Antioxidant and radioprotective effect of the active fraction of Pilea microphylla (L.) ethanolic extract

Prabhakar, KR and Veerapur, VP and Bansal, Punit and Parihar, Vipan Kumar and Kandadi , Machendar Reddy and Potu, Bhagath Kumar and Priyadarsini, KI and Unnikrishnan, MK (2007) Antioxidant and radioprotective effect of the active fraction of Pilea microphylla (L.) ethanolic extract. Chemico-Biological Interactions, 165. pp. 22-32.

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Abstract

The ethanolic extract of Pilea microphylla (L.) was defatted, successively fractionated with acetone and the residue so obtained was found to be most potent when subjected to detailed free radical scavenging and in vivo radioprotection studies. The most active fraction reacts with free radicals, such as DPPH (50 �M), ABTS•− (100�M) and •OH (generated by Fenton reaction) with IC50 value of 23.15 �g/ml, 3.0 �g/ml and 310 �g/ml, respectively. The most active fraction inhibited iron-induced lipid peroxidation in phosphatidyl choline liposomes with an IC50 of 13.74�g/ml. The kinetics of scavenging of DPPH and ABTS•− radicals were followed at different concentrations of the fraction by employing stopped-flow studies. The observed first order decay rate constants at 200 �g/ml and 50 �g/ml of fraction with DPPH (50 �M) and ABTS•− (50�M) were found to be 0.4 s−1 and 2.1 s−1, respectively. The fraction when screened for in vivo radioprotection in Swiss albino mice showed 80% protection at a dose of 900 mg/kg and with a DRF of about 1.12. The fraction was also found to protect livers of irradiated mice from depletion of endogenous antioxidant enzymes like glutathione, GST, SOD, catalase and thiols. The fraction also protected the villi height, increased the number of crypt cells while offering general protection to the intestine from acute radiation effects. The fraction also protected the hematopoietic system as assessed by endogenous spleen colony assay, contributing to the overall radioprotective ability.

Item Type: Article
Uncontrolled Keywords: Free radical reactions, Pilea microphylla, Radioprotection, GI protection, Hematopoietic protection
Subjects: Medicine > KMC Manipal > Anatomy
Pharmacy > MCOPS Manipal > Pharmacology
Depositing User: KMC Manipal
Date Deposited: 18 Jun 2011 06:44
Last Modified: 09 Oct 2013 06:12
URI: http://eprints.manipal.edu/id/eprint/310

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