Journal of Medicinal Chemistry p. 1291 - 1293 (1986)
Update date:2022-08-25
Topics:
Renard, C
Michel, A.
Tulkens, P. M.
Peptidic lysosomotropic prodrugs of antibiotics and antitumoral agents could be of advantage in chemotherapy, providing that free, active drug is released at, or close to, the desired site of action.Thus, aminoacyl derivatives of doxorubicin, e.g., where the drug is attached to the amino acid by a primary amino function, are sensitive to lysosomal hydrolases.We have examined whether a similar approach can be used for drugs carrying a carboxyl group such as β-lactam antibiotics.Because the C adjacent to the carboxyl group in β-lactams has the D configuration, we have examined and report here the synthesis and susceptibility of model peptides, namely Boc-D-Pro-L-Ala and Boc-L-Pro-L-Ala to lysosomal hydrolases.Hydrolysis of the D isomer proceeds considerably more slowly than that of the L isomer.Lysosomal carboxypeptidase(s) and/or amidases appear therefore to have a much narrower specificity than aminopeptidase(s), which will severely limit the applicability of the concept of peptidic lysosomotropic prodrugs.
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