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Quasi-SMILES: quantitative structure–activity relationships to predict anticancer activity

  • Alla P. Toropova
  • Andrey A. Toropov
Original Article
  • 17 Downloads

Abstract

Reliable prediction of anticancer potential of different substances for different cells using unambiguous algorithms is attractive alternative of experimental investigation of impacts of various anticancer agents to various cells. Quasi-SMILES is a sequence of symbols, which represents all available eclectic data, i.e. not only molecular structure, but also different conditions, which can have influence on examined endpoint (e.g. kinds of cells: human breast; human colon; human liver; human lung). In this work, quasi-SMILES have been used to establish predictive models for anticancer activity isoquinoline quinones related to different cells. Descriptor calculated with optimal correlation weights of different fragments of quasi-SMILES defined by the Monte Carlo technique is used to predict pIC50 as a mathematical function of molecular structure and kinds of cells. The using of the so-called index of ideality of correlation for optimization by the Monte Carlo method improves predictive potential of the model. The statistical quality of the models based on correlation weights of fragments of quasi-SMILES is good. The range of correlation coefficient between experimental and calculated pIC50 for external validation set is 0.76–0.89. The statistical stable promoters for increase and for decrease in pIC50 are established. These models can be used to improve quality of pharmaceutical agents. These computational experiments can be reproduced with available on the Internet software (http://www.insilico.eu/coral).

Graphical abstract

Keywords

Anticancer activity Isoquinoline quinones QSAR Quasi-SMILES Monte Carlo method 

Notes

Acknowledgements

Authors thank the EU Project LIFE-CONCERT (LIFE17 GIE/IT/000461) for financial support.

Supplementary material

11030_2018_9881_MOESM1_ESM.xlsx (27 kb)
Supplementary material 1 (XLSX 27 kb)
11030_2018_9881_MOESM2_ESM.docx (22 kb)
Supplementary material 2 (DOCX 21 kb)

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Laboratory of Environmental Chemistry and Toxicology, Department of Environmental Health SciencesIstituto di Ricerche Farmacologiche Mario Negri - IRCCSMilanItaly

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