Abstract
Background: Cisplatin resistance has been mainly associated with decreased cellular accumulation and increased intracellular glutathione (GSH) levels. ATP is known to increase the membrane permeability of cells and to decrease intracellular GSH levels. Our study aimed at using extracellular ATP to sensitize ovarian carcinoma cells towards cisplatin. Methods: The MTT assay was used to determine the EC<sub>50</sub> of cisplatin in the human ovarian carcinoma cell line A2780 and its cisplatin-resistant variant A2780cis. Intracellular platinum concentrations were determined using flameless atomic absorption spectrometry. Results: Preincubation and concomitant incubation with ATP did not alter the EC<sub>50</sub> of cisplatin. The presence of 100 µM ATP along with cisplatin decreased cell survival in A2780 but not in A2780cis cells. Extracellular ATP did not increase the cellular accumulation of cisplatin in both A2780 and A2780cis cells. Conclusion: The presence of extracellular ATP during treatment with cisplatin leads to additive cytotoxicity in the sensitive A2780 but not in cisplatin-resistant A2780cis cells.
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