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Cytotoxicity, cell cycle kinetics and morphonuclear-induced effects of Vinca alkaloid anticancer agents
O Pauwels1, R Kiss, J L Pasteels
1Laboratoire de Pharmacologie Cellulaire, Institut de Pharmacie, Université Libre de Bruxelles, Belgium.
Abstract:
The effects of four Vinca alkaloids (vinblastine, vincristine, vindesine and vinorelbine) on three neoplastic cell lines (the MXT mouse mammary cell line and the T24 and J82 bladder cell lines) were studied at three biological levels, i.e. cell proliferation, cell cycle kinetics and morphonuclear characteristics. These effects were studied by means of digital cell image analysis on Feulgen-stained nuclei. The aim of the present work was to characterize the effects specifically induced by Vinca alkaloids as compared with those obtained previously with other pharmacological classes of anticancer drugs. The results show that Vinca alkaloids inhibit the cell proliferation of neoplastic cell lines at a concentration of 10(-8) M except in the case of the J82 cell line, for which only a slowing down of cell proliferation was observed. Concerning the cell cycle kinetics, the results show that the Vinca alkaloids induce an accumulation of cells in the mitosis phase. This accumulation of mitotic cells was maximal after 15 h incubation in the presence of the drugs. A study of the morphonuclear-induced effects of Vinca alkaloids showed that the variance of the optical density (VOD) is strongly influenced by these Vinca alkaloids. The development of the VOD was parallel with the development of the percentage of mitosis; thus, the VOD enabled the Vinca alkaloid-induced effects to be specifically characterized from a morphonuclear point of view. On the other hand, the results show that the mean value of the variance of the optical density was very highly correlated (P < 0.001) with the efficiency of the Vinca alkaloids in terms of cytotoxicity. In clinical studies, the analysis of the development of this parameter would make it possible to assess the response to chemotherapy in the case of patients treated with Vinca alkaloids.
Insights
Vinca alkaloids inhibit cancer cell proliferation and cause mitotic arrest. Variance of optical density (VOD) correlates with drug effectiveness, offering a method to assess chemotherapy response.
Area of Science:
- Oncology
- Pharmacology
- Cell Biology
Background:
- Vinca alkaloids are a class of anticancer drugs.
- Understanding their specific cellular effects is crucial for optimizing cancer therapy.
- Previous studies have explored various anticancer agents, necessitating a focused characterization of Vinca alkaloids.
Purpose of the Study:
- To investigate the effects of four Vinca alkaloids (vinblastine, vincristine, vindesine, vinorelbine) on neoplastic cell lines.
- To analyze these effects at the levels of cell proliferation, cell cycle kinetics, and morphonuclear characteristics.
- To specifically differentiate Vinca alkaloid-induced effects from those of other anticancer drug classes.
Main Methods:
- Digital cell image analysis of Feulgen-stained nuclei from MXT, T24, and J82 cell lines.
- Assessment of cell proliferation rates and cell cycle distribution.
- Quantification of morphonuclear characteristics, specifically the variance of optical density (VOD).
Main Results:
- Vinca alkaloids inhibited cell proliferation in most tested lines at 10(-8) M, with J82 showing slowed proliferation.
- An accumulation of cells in the mitosis phase was observed, peaking at 15 hours of drug exposure.
- Variance of optical density (VOD) was significantly influenced by Vinca alkaloids and correlated with the percentage of mitotic cells and cytotoxicity.
Conclusions:
- Vinca alkaloids exhibit specific antiproliferative and cell cycle-disrupting effects on cancer cells.
- The VOD parameter serves as a reliable indicator for characterizing Vinca alkaloid-induced morphonuclear changes.
- VOD analysis holds potential for predicting patient response to Vinca alkaloid-based chemotherapy.