Eribulin disrupts EB1-microtubule plus-tip complex formation |
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Authors: | Brian O’Rourke Chia-Ping Huang Yang David Sharp |
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Institution: | 1. Department of Physiology and Biophysics;2. Albert Einstein College of Medicine;3. Bronx, NY USA;4. Department of Molecular Pharmacology;5. Department of Obstetrics and Gynecology and Women's Health;6. Division of Gynecologic Oncology |
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Abstract: | Eribulin mesylate is a synthetic analog of halichondrin B known to bind tubulin and microtubules, specifically at their protein rich plus-ends, thereby dampening microtubule (MT) dynamics, arresting cells in mitosis, and inducing apoptosis. The proteins which bind to the MT plus-end are known as microtubule plus-end tracking proteins (+TIPs) and have been shown to promote MT growth and stabilization. Eribulin's plus-end binding suggests it may compete for binding sites with known +TIP proteins such as End-binding 1 (EB1). To better understand the impact of eribulin plus-end binding in regard to the proteins which normally bind there, cells expressing GFP-EB1 were treated with various concentrations of eribulin. In a concentration dependent manner, GFP-EB1 became dissociated from the MT plus-ends following drug addition. Similar results were found with immuno-stained fixed cells. Cells treated with low concentrations of eribulin also showed decreased ability to migrate, suggesting the decrease in MT dynamics may have a downstream effect. Extended exposure of eribulin to cells leads to total depolymerization of the MT array. Taken together, these data show eribulin effectively disrupts EB1 +TIP complex formation, providing mechanistic insights into the impact of eribulin on MT dynamics. |
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Keywords: | EB1 eribulin microtubules migration taxol |
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