Abstract
Literature data show that butyric acid derivatives bear a dose-dependent differentiative anti-proliferative activity on cancer cell lines and that apoptosis induction may play a major role. Although it was recently shown that solid lipid nanospheres (SLNs) are a suitable tool for several in vivo drug administration routes, there is little available information on melanoma cell lines. This study was aimed at evaluating the anti-proliferative and apoptotic in vitro effects of cholesteryl butyrate (chol-but) SLNs on melanoma cells. Increasing concentrations of chol-but SLNs were used to test two melanoma cell lines. Both cell lines were treated with Na-butyrate (Na-but) and chol-but SLNs for viability. Those tested with chol-but SLNs were more effective than Na-butirate (3 to 72 h). The apoptotic effects of chol-but SLNs were evaluated between 3 and 72 h by annexin-V (ANX-V)/propidium iodide (PI) staining and the antiproliferative effect by PI staining. Apoptosis anti-proliferative-regulatory proteins as bcl-2, Fas/APO1 (CD95) and PCNA (PC10) were also investigated. Flow cytometric analyses evidenced a G0/1-S transition block and a `sub-G0/1' apoptotic peak from 0.5 to 1.0 mM butyric acid. In ANX-V/PI flow cytometric staining, a dose- and time-dependent increase in the apoptotic cell percentage (ANX-V+) coupled with a down-regulation of PC10 and bcl-2 and a parallel up-regulation of Fas/APO1 (CD95) were found in both lines started after 3 to 24 h of chol-but SLNs treatment. Results show that chol-but SLNs exerts a dose/time-dependent effect in melanoma cell apoptosis induction between 3 and 24 h and a dose but not time-dependent effect after 24 h of treatment.
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Salomone, B., Ponti, R., Gasco, M. et al. In vitro effects of cholesteryl butyrate solid lipid nanospheres as a butyric acid pro-drug on melanoma cells: Evaluation of antiproliferative activity and apoptosis induction. Clin Exp Metastasis 18, 663–673 (2000). https://doi.org/10.1023/A:1013186331662
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DOI: https://doi.org/10.1023/A:1013186331662