Lucie Koubkova1, Rostislav Vyzula1, Jindrich Karban2, Jiri Pinkas3, Eva Ondrouskova1, Borivoj Vojtesek1, Roman Hrstka4. 1. Regional Centre for Applied and Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 65653, Brno, Czech Republic. 2. Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, v.v.i., Rozvojova 135, 165 02, Prague 6, Czech Republic. 3. J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejskova 2155/3, 182 23, Prague 8, Czech Republic. 4. Regional Centre for Applied and Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 65653, Brno, Czech Republic. hrstka@mou.cz.
Abstract
BACKGROUND: Ovarian cancer is the seventh-most common cancer amongst women and the most deadly gynecologic cancer. Cisplatin based drugs are used in first line therapy, but resistance represents a major obstacle for successful treatment. In this study, we investigated the anticancer effects and mechanism of action of three titanocene difluorides, two bearing a pendant carbohydrate moiety (α-D-ribofuranos-5-yl) on their periphery and one without any substitution. RESULTS: The efficacy of these compounds on ovarian cancer cell lines was evaluated in relation to their particular chemical structure and compared with cisplatin as the most common treatment modality for this type of cancer. The typical mechanism of cisplatin action involves DNA damage, activation of p53 protein and induction of cell death, as previously described for titanium ions. Nevertheless, our data indicate that the effect of titanocene difluoride derivatives is mediated via the endoplasmic reticulum stress pathway and autophagy. CONCLUSION: We anticipate that the presence of substituents on cyclopentadienyl ring(s) might play an important role in modulation of the activity of particular compounds. Titanocene difluorides exert comparable cytotoxic activity as cisplatin and are more efficient in cisplatin-resistant cell lines. Our results suggest potential utilization of these compounds especially in the treatment of cisplatin-resistant tumor cells.
BACKGROUND:Ovarian cancer is the seventh-most common cancer amongst women and the most deadly gynecologic cancer. Cisplatin based drugs are used in first line therapy, but resistance represents a major obstacle for successful treatment. In this study, we investigated the anticancer effects and mechanism of action of three titanocene difluorides, two bearing a pendant carbohydrate moiety (α-D-ribofuranos-5-yl) on their periphery and one without any substitution. RESULTS: The efficacy of these compounds on ovarian cancer cell lines was evaluated in relation to their particular chemical structure and compared with cisplatin as the most common treatment modality for this type of cancer. The typical mechanism of cisplatin action involves DNA damage, activation of p53 protein and induction of cell death, as previously described for titanium ions. Nevertheless, our data indicate that the effect of titanocene difluoride derivatives is mediated via the endoplasmic reticulum stress pathway and autophagy. CONCLUSION: We anticipate that the presence of substituents on cyclopentadienyl ring(s) might play an important role in modulation of the activity of particular compounds. Titanocene difluorides exert comparable cytotoxic activity as cisplatin and are more efficient in cisplatin-resistant cell lines. Our results suggest potential utilization of these compounds especially in the treatment of cisplatin-resistant tumor cells.
Authors: Ute Jungwirth; Christian R Kowol; Bernhard K Keppler; Christian G Hartinger; Walter Berger; Petra Heffeter Journal: Antioxid Redox Signal Date: 2011-05-11 Impact factor: 8.401