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Diethylstilbestrol induces metaphase arrest and inhibits microtubule assembly
Abstract:
Diethylstilbestrol produced a dose-dependent increase in the mitotic index of the human prostatic tumour cell line DU 145. This is the result of metaphase arrest which may be induced by the action of diethylstilbestrol on spindle microtubules. Evidence is presented to show that diethylstilbestrol affects microtubules. Diethylstilbestrol completely inhibited the assembly of isolated brain microtubules although only partial disassembly could be induced. In contrast to other microtubule poisons, the inhibitory effect of diethylstilbestrol on taxol-induced self-assembly could be reversed by the addition of GTP.
Insights
Diethylstilbestrol (DES) increases cell division in prostate cancer cells by arresting them in metaphase. DES affects microtubules, impacting cell division processes.
Area of Science:
- Cell Biology
- Pharmacology
- Oncology
Background:
- Prostate cancer remains a significant health concern.
- Understanding the mechanisms of anti-cancer agents is crucial for developing effective treatments.
- Diethylstilbestrol (DES) has shown effects on cell division.
Purpose of the Study:
- To investigate the effect of Diethylstilbestrol (DES) on the mitotic index of the DU 145 human prostate cancer cell line.
- To explore the potential mechanism of DES-induced cell cycle arrest, specifically its interaction with microtubules.
Main Methods:
- Treatment of DU 145 cells with varying doses of DES.
- Assessment of the mitotic index and observation of metaphase arrest.
- In vitro studies on the assembly and disassembly of isolated brain microtubules in the presence of DES.
- Evaluation of DES's effect on taxol-induced microtubule self-assembly and the role of GTP.
Main Results:
- DES induced a dose-dependent increase in the mitotic index of DU 145 cells.
- Metaphase arrest was observed, suggesting interference with spindle microtubules.
- DES completely inhibited microtubule assembly and partially induced disassembly.
- The inhibitory effect of DES on taxol-induced microtubule self-assembly was reversible with GTP.
Conclusions:
- Diethylstilbestrol (DES) promotes metaphase arrest in prostate cancer cells, likely by affecting spindle microtubules.
- DES interferes with microtubule dynamics, offering a potential therapeutic avenue.
- The interaction of DES with microtubules is distinct from other known microtubule poisons and can be modulated by GTP.