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Epirubicin-[Anti-HER2/neu] Synthesized with an Epirubicin-(C13-imino)-EMCS Analog: Anti-Neoplastic Activity against Chemotherapeutic-Resistant SKBr-3 Mammary Carcinoma in Combination with Organic Selenium

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DOI: 10.4236/jct.2011.21004    3,866 Downloads   8,291 Views   Citations

ABSTRACT

Purpose: Discover the anti-neoplastic efficacy of epirubicin-(C13-imino)-[anti-HER2/neu] against chemotherapeutic- resistant SKBr-3 mammary carcinoma and delineate the capacity of selenium to enhance it’s cytotoxic anti-neoplastic potency. Methods: In molar excess, EMCH was combined with epirubicin to create a covalent epirubicin-(C13-imino)-EMCH-maleimide intermediate with sulfhydryl-reactive properties. Monoclonal immunoglobulin selective for HER2/neu was then thiolated with 2-iminothiolane at the terminal ε-amine group of lysine residues. The sulfhydryl-reactive epirubicin-(C13-imino)-EMCH intermediate was then combined with thiolated anti-HER2/neu monoclonal immunoglobulin. Western-blot analysis was utilized to characterize the molecular weight profiles while binding of epirubicin-(C13-imino)-[anti-HER2/neu] to membrane receptors was determined by cell-ELISA utilizing populations of SKBr-3 mammary carcinoma that highly over-expresses HER2/neu complexes. Anti-neoplastic potency of epirubicin-(C13-imino)-[anti-HER2/ neu] between the epirubicin-equivalent concentrations of 10–12 M and 10–7 M was determined by vitality staining analysis with and without the presence of selenium (5 μM). Results: Epiribucin-(C13-imino)-[anti-HER2/neu] between epirubicin-equivalent concentrations of 10–8 M to 10–7 M consistently evoked higher anti-neoplastic potency than “free” non- conjugated epirubicin which corresponded with previous investigations utilizing epirubicin-(C3-amide)-[anti-HER2/neu] and epirubicin-(C3-amide)-[anti-EGFR]. Selenium at 5 mM consistently enhanced the cytotoxic anti-neoplastic potency of epirubicin-(C13-imino)-[anti-HER2/neu] at epirubicin equivalent concentrations (10–12 to 10–7 M). Conclusions: Epirubicin-(C13-imino)-[anti-HER2/neu] is more potent than epirubicin against chemotherapeutic-resistant SKBr-3 mammary carcinoma and selenium enhances epirubicin-(C13-imino)-[anti-HER2/neu] potency. The methodology applied for synthesizing epirubicin-(C13-imino)-[anti-HER2/neu] is relatively time convenient and has low instrumentation requirements.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

C. Coyne, T. Jones, A. Sygula, J. Bailey and L. Pinchuk, "Epirubicin-[Anti-HER2/neu] Synthesized with an Epirubicin-(C13-imino)-EMCS Analog: Anti-Neoplastic Activity against Chemotherapeutic-Resistant SKBr-3 Mammary Carcinoma in Combination with Organic Selenium," Journal of Cancer Therapy, Vol. 2 No. 1, 2011, pp. 22-39. doi: 10.4236/jct.2011.21004.

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