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ORIGINAL ARTICLE
Year : 2018  |  Volume : 14  |  Issue : 59  |  Page : 515-519

Inducible nitric oxide synthase downregulation and apoptotic activity of Pleurotus florida (Oyster Mushroom)


1 School of Health Sciences and Psychology, University of East London, United Kingdom
2 Department of Biotechnology, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India
3 Department of Biochemistry, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India

Correspondence Address:
Ramaraj Thirugnanasampandan
Department of Biotechnology, Kongunadu Arts and Science College, GN Mills, Coimbatore - 641 029, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/pm.pm_59_18

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Background: Pleurotus florida is an edible delicious mushroom grown on large scale in different parts of the world. Objective: The objective of this study is to test the hepatoprotective, cytotoxic, and apoptotic activities of methanol extract of P. florida. Materials and Methods: 1.5 μg lipopolysaccharide (LPS)/25 g body weight was used to induce hepatic inflammation in Baggs albino mice strain c followed by treatment with varied concentrations of P. florida methanol extract. Hepatoprotective activity of mushroom extract was studied examining the liver sections. Total RNA of hepatocytes was isolated and reverse transcriptase-polymerase chain reaction (RT-PCR) of inducible nitric oxide synthase (iNOS) gene was performed. The mushroom extract was evaluated for its cytotoxic and apoptotic activity against human cervical carcinoma cells using 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyl tetrazolium bromide and 4'-6-diamidino-2-phenylindole assay, propidium iodide, acridine orange/ethidium bromide staining methods. Results: High hepatoprotection with no abnormalities was observed at 125 μg of mushroom extract. RT-PCR showed significantly reduced transcriptional expression of iNOS at 125 μg concentration of mushroom extract. The methanol extract of P. florida showed cytotoxic activity with IC50 of 47.11 ± 0.01 μg/mL and effectively induced apoptosis in a concentration-dependent manner. Conclusion: The results of the present study revealed that P. florida is not only a nutritionally valuable food but also an important source for therapeutic compounds. Abbreviations used: iNOS: Inducible nitric oxide synthase; LPS: Lipopolysaccharide; MTT: 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyl tetrazolium bromide; PI: Propidium iodide; AO: Acridine orange; EtBr: Ethidium bromide; DAPI: 4'-6-diamidino-2-phenylindole; PBS: Phosphate-buffered saline; COX-2: Cyclooxygenase-2; NO: Nitric oxide; BALB/c: Baggs albino mice strain c; RT-PCR: Reverse transcriptase-polymerase chain reaction; HeLa: Human cervical carcinoma; DMEM: Dulbecco's modified Eagle's medium


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