Influence of Alternative Tubulin Inhibitors on the Potency of Epirubicin-Immunochemotherapeutic Synthesized with an Ultra Violet Light-Activated Intermediate

Cody Coyne, Toni Jones, Ryan Bear


Immunochemotherapeutics, epirubicin-(C3-amide)-SS-[anti-HER2/neu] with an internal disulfide bond, and epirubicin-(C3-amide)-[anti-HER2/neu] were synthesized utilizing succinimidyl 2-[(4,4´-azipentanamido)ethyl]-1,3´-dithioproprionate or succinimidyl 4,4-azipentanoate respectively. Western-blot/chemiluminescent autoradiography analysis was utilized to characterize molecular weight profiles in order to identify evidence of immunoglobulin fragmentation or IgG-IgG polymerization. Retained HER2/neu binding characteristics of epirubicin-(C3-amide)-[anti-HER2/neu] and epirubicin-(C3-amide)-SS-[anti-HER2/neu] were determined by cell-ELISA in mammary adenocarcinoma SKBr-3 monolayer populations that highly over-expresses trophic HER2/neu receptors complexes. Cytotoxic anti-neoplastic potency of epirubicin-(C3-amide)-[anti-HER2/neu] and epirubicin-(C3-amide)-SS-[anti-HER2/neu] between epirubicin-equivalent concentrations of 10-10 M and 10-6 M was determined by measuring cell vitality staining intensity of chemotherapeutic-resistant mammary adenocarcinoma (SKBr-3 cell type). Cytotoxic anti-neoplastic potency of benzimidazoles (albendazole, flubendazole, membendazole) and griseofulvin were assessed between 0-to-2 mg/ml and 0-to-100 mg/ml respectively while mebendazole and griseofulvin were analyzed at fixed concentrations of 0.35 mg/ml and 35 mg/ml  respectively in combination with gradient concentrations of epirubicin-(C3-amide)-[anti-HER2/neu] and epirubicin-(C3-amide)-SS-[anti-HER2/neu].

Cytotoxic anti-neoplastic potency for epirubicin-(C3-amide)-[anti-HER2/neu] and epirubicin-(C3-amide)-SS-[anti-HER2/neu] against chemotherapeutic-resistant mammary adenocarcinoma SKBr-3 was nearly identical at epirubicin-equivalent concentrations of 10-10 M and 10-6 M. The benzimadazoles were possessed cytotoxic anti-neoplastic potency with flubendazole and albendazole being the most and least potent respectively. Similarly, griseofulvin had cytotoxic anti-neoplastic activity and was more potent than methylselenocysteine. Both mebendazole and griseofulvin increased the cytotoxic potency of both epirubicin-(C3-amide)-[anti-HER2/neu] or epirubicin-(C3-amide)-SS-[anti-HER2/neu]. Collectively, the epirubicin-(C3-amide)-[anti-HER2/neu] immunochemotherapeutics and benzimidazole/griseofulvin tubulin/microtubule inhibitors demonstrated a potential utility to function as alternative forms of monontherapy or components of combination therapy regiments for improved therapeutic management of aggressive and chemotherapeutic-resistant forms of neoplasia.

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Cancer and Clinical Oncology ISSN 1927-4858(Print) ISSN 1927-4866(Online)

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