Add time:08/23/2019         Source:sciencedirect.com

Here we describe the design and synthesis of a prodrug developed for pigmented melanoma therapy, consisting of a Melanin-Targeting Probe (MTP) conjugated to 5-iodo-2′-deoxyuridine (IUdR) with a reduction-sensitive pre-determined breaking point. Compared with the non-cleavable conjugate (17b), prodrug (17a) bearing a self-immolative disulfide linker achieved complete release of IUdR within 20 min in the presence of reducing agents such as DTT or glutathione. Analytical results also showed that prodrug (17a) was more sensitive than parent non-cleavable conjugate (17b) for a concentration range of glutathione similar to that found in the intracellular compartment of tumours.

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