Summary
The patterns of the cytolytic effects of 6-hydroxydopamine (6-OHDA), with/without ascorbate, on C-1300 and three other cloned mouse neuroblastoma cell lines (N1E-115, NS-20, N-18) were studied in vitro. The sensitivity to 6-OHDA differed and the three cloned cell lines were more sensitive than the wild type C-1300 cell line. Ascorbate synergistically potentiated the cytolytic effect of 6-OHDA to all four cell lines. The 6-OHDA cytotoxicity was eliminated by the addition of exogenous catalase but not by addition of other oxygen free radical scavengers, thereby suggesting that the hydrogen peroxide formed might influence the cells, extracellularly. In addition, the critical time for tumor cell lysis was the first 60 min of the reaction. The cytotoxicity induced by the unmasked cyclophosphamide, 4-hydroperoxycyclophosphamide, was synergistically enhanced in the presence of a nontoxic concentration of 6-OHDA and ascorbate. These data suggest that reactive oxygen intermediates may prove to be a good tool for destroying neuroblastoma cells.
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Zaizen, Y., Nakagawara, A. & Ikeda, K. Patterns of destruction of mouse neuroblastoma cells by extracellular hydrogen peroxide formed by 6-hydroxydopamine and ascorbate. J Cancer Res Clin Oncol 111, 93–97 (1986). https://doi.org/10.1007/BF00400743
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DOI: https://doi.org/10.1007/BF00400743