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Taxol causes rapid gross structural rearrangement of a native microtubule bundle
1University of Exeter, Department of Biological Sciences, Washington Singer Laboratories, U.K.
Abstract:
Taxol is an anti-mitotic agent now being used in the treatment of some cancer, although the manner of its interaction with the microtubular components of the cytoskeleton is still not fully characterized. Here we report the effects of taxol upon a huge, naturally occurring and experimentally amenable aggregate of parallel microtubules from the ovaries of hemipteran insects. Within seconds of exposure to taxol, the microtubule aggregate began to twist upon itself. After a few minutes this movement was complete, the drug having brought about a gross rearrangement of the microtubules, involving coiling on a massive scale. The final form assumed by the microtubule array was influenced by pH and by the presence of microtubule-associated proteins, salt, cations, and both hydrolysable and non-hydrolysable nucleotides. The possible mechanisms leading to this rapid structural change are considered.
Insights
Taxol, an anti-cancer drug, causes massive coiling of microtubule aggregates in insect ovaries within minutes. This rapid structural change reveals new insights into Taxol
Area of Science:
- Cell Biology
- Biochemistry
- Pharmacology
Background:
- Taxol (paclitaxel) is an anti-mitotic chemotherapy agent.
- Its precise mechanism of action on cytoskeletal microtubules remains incompletely understood.
- Microtubule dynamics are crucial for cell division and structure.
Purpose of the Study:
- To investigate the effects of Taxol on large, organized microtubule structures.
- To characterize the rapid structural rearrangements induced by Taxol exposure.
- To explore factors influencing Taxol-induced microtubule coiling.
Main Methods:
- Utilized naturally occurring microtubule aggregates from hemipteran insect ovaries.
- Observed the effects of Taxol exposure on these aggregates in real-time.
- Varied experimental conditions including pH, salts, cations, and nucleotides.
Main Results:
- Taxol induced rapid twisting and massive coiling of microtubule aggregates within seconds to minutes.
- The final coiled structure was dependent on pH and the presence of microtubule-associated proteins, salt, cations, and nucleotides.
- Demonstrated a significant and rapid gross rearrangement of microtubule organization.
Conclusions:
- Taxol directly induces large-scale structural reorganization of microtubules.
- The observed coiling provides a model system to study Taxol's interaction with microtubules.
- Environmental factors significantly modulate Taxol's effect on microtubule structure.