A targeted toxin based on a binding module of non-immunoglobulin scaffold as a new agent for theranostics

Galina M. Proshkina, O. A. Stremovskiy, D. V. Sibrikova, A. V. Ryabova, S. M. Deyev

Research output: Contribution to journalArticlepeer-review


The aim of the investigation was to create multifunctional antitumor protein agent DARPin-mCherry-PE40 possessing both diagnostic and therapeutic properties. Materials and Methods. The experiments were carried out on human cell lines of breast adenocarcinoma SK-BR-3. Chinese hamster ovarian cell line CHO-K1 was used as a control. Genetic engineering methods, metal chelate affinity chromatography, confocal microscopy and spectrophotometric MTT test were used to perform the experiments. Results. A multifunctional targeted anticancer protein agent DARPin-mCherry-PE40 consisting of targeted HER2-specific nonimmunoglobulin module DARPin, an imaging module mCherry and cytotoxic module based on a fragment of Pseudomonas exotoxin A (PE40) has been created. Using HER2-positive cells it was shown in vitro that all three domains of the recombinant protein retained their functional qualities — high affinity for HER2 antigen, ability to fluorescence, and cytotoxicity. Conclusion. The ability of the targeted antitumor agent DARPin-mCherry-PE40 selectively stains HER2-positive cells and highly selective cytotoxicity against these cells make this targeted recombinant protein DARPin-mCherry-PE40 a perspective theranostic agent for the diagnosis and treatment of HER2-positive human tumors.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalSovremennye Tehnologii v Medicine
Issue number4
Publication statusPublished - 2016


  • DARPin
  • HER2 receptor
  • MCherry
  • PE40
  • Pseudomonas aeruginosa exotoxin A fragment
  • Theranostics

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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