title: In vitro cytotoxic and in silico activity of piperine isolated from Piper nigrum fruits Linn.
abstract: BACKGROUND
  Piper nigrum [Piperaceae], commonly known as black pepper is used as medicine fairly throughout the greater part of India and as a spice globally.
  
  
  OBJECTIVE
  To isolate piperine and evaluate in vitro cytotoxic [antiproliferative] activity and in silico method.
  
  
  METHODS
  Piperine was isolated from the fruits of P.nigrum. Piperine was characterized by UV,IR, (1)H-NMR, (13)C-NMR and Mass spectrum. Standardization of piperine was done also by HPTLC fingerprinting. In vitro cytotoxic activity was done using HeLa cell lines by MTT assay at different concentrations ranging from 20 to 100 μg/ml in triplicate and in silico docking studies using enzyme EGFR tyrosine kinase.
  
  
  RESULTS
  Fingerprinting of isolated piperine were done by HPTLC method. The IC50 value was found to be 61.94 ± 0.054 μg/ml in in vitro cytotoxic activity in HeLa Cell lines. Piperine was subjected to molecular docking studies for the inhibition of the enzyme EGFR tyrosine kinase, which is one of the targets for inhibition of cancer cells. It has shown -7.6 kJ mol(-1) binding and 7.06 kJ mol(-1) docking energy with two hydrogen bonds.
  
  
  CONCLUSIONS
  piperine has shown to possess in vitro cytotoxic activity and in silico studies.
authors.affiliation: Department of Pharmacognosy, The Oxford College of Pharmacy, 6/9, I Cross, Begur Road, Hongasandra, Bangalore, 560068, Karnataka, India. padmaparas@hotmail.com.
authors.forename: Padmaa M
authors.initials: PM
authors.lastname: Paarakh
authors.affiliation: R & D [Phytochemistry], Natural Remedies Private limited, Bangalore, India.
authors.forename: Dileep Chandra
authors.initials: DC
authors.lastname: Sreeram
authors.affiliation: Microbiology and Cell Biology Department, Indian Institute of Science, Bangalore, Karnataka, India.
authors.forename: Shruthi S
authors.initials: SS
authors.lastname: D
authors.affiliation: Research and Development Centre, Olive LifeSciences Pvt. Ltd., Nelamangala, Bangalore, 562123, Karnataka, India.
authors.forename: Sujan P S
authors.initials: SP
authors.lastname: Ganapathy
keywords: In silico docking studies; In vitro cytotoxic activity; Isolation; Piper nigrum; Piperine
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