Scientists have uncovered critical new details about the mechanisms that modulate the response of ovarian cancer cells to chemotherapy.
The research, published by Cell Press in the December issue of Cancer Cell, helps to explain why many patients develop resistance to the taxane class of drugs and may lead to improved treatment of ovarian cancer.
Cancer cells divide rapidly and undergo extensive microtubule-driven restructuring as they proliferate. Taxanes, such as paclitaxel (Taxol), interfere with the dynamic growth of microtubules by directly binding to them and making them more stable and, as a result, disrupt the normal process of cell division. Paclitaxel has been used extensively to treat lung, ovarian and breast cancers but drug resistance limits the clinical usefulness of this drug to only about half of breast or ovarian cancer patients.
Although it is clear that taxane resistance is associated with a loss of stable microtubules and that microtubule stability can be influenced by signals from the extracellular matrix (ECM), a role for ECM proteins in the modulation of paclitaxel sensitivity has not been established. To explore the connection between regulation of microtubules and taxane resistance, Dr. James D. Brenton from the Cancer Research UK Cambridge Research Institute in Cambridge, England and colleagues performed an extensive examination of ovarian cancer cell lines that were sensitive or resistant to paclitaxel.