Verlicchi F, Boschi S, Visani G, Guidi A, Tosi P, Cavo M, Tura S. Evidence for increased intracellular transport of m-sarcolysine (alkylating moiety) when combined with two amino acid analogs (PTT-119).
BLUT 1990;
61:311-3. [PMID:
2271778 DOI:
10.1007/bf01732884]
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Abstract
PTT-119 is an antineoplastic agent in which an alkylating moiety, m-sarcolysine, is linked to two amino acid analogs. Previous studies showed a higher "in vitro" cytotoxicity of PTT-119 when compared to free m-sarcolysine; the mechanisms of this enhanced activity are not completely understood. In this study we incubated peripheral blood cells from 8 chronic lymphocytic leukemia patients with both m-sarcolysine and equimolar concentrations of PTT-119, measuring the intracellular concentration of the alkylating moiety. We observed a significantly higher intracellular concentration of m-sarcolysine in cells incubated with the peptide-bound drug than with the free drug (58.3 +/- 39.6 versus 4.4 +/- 1.9 ng/10(6) cells; P = 0.013). This observation could explain the higher cytotoxic activity of PTT-119 and the lack of cross-resistance with melphalan.
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