Influence of chain length on the activity of tripeptidomimetic antagonists for CXC chemokine receptor 4 (CXCR4)
ForfatterBaumann, Markus; Hussain, Mohammad Musarraf; Henne, Nina; Garrote, Daniel Moya; Karlshøj, Stefanie; Fossen, Torgils; Rosenkilde, Mette M.; Våbenø, Jon; Haug, Bengt Erik
Here we report a series of close analogues of our recently published scaffold-based tripeptidomimetic CXCR4 antagonists, containing positively charged guanidino groups in R1 and R2, and an aromatic group in R3. While contraction/elongation of the guanidine carrying side chains (R1 and R2) resulted in loss of activity, introduction of bromine in position 1 on the naphth-2-ylmethyl moiety (R3 ) resulted in an EC50 of 61 µM (mixture of diastereoisomers) against wild-type CXCR4; thus, the antagonistic activity of these tripeptidomimetics seems to be amenable to optimization of the aromatic moiety. Moreover, for analogues carrying a naphth-2-ylmethyl substituent, we observed that a Pictet-Spengler like cyclization side reaction depended on the nature of the R1 substituent.
Submitted manuscript version. Published version available in Bioorganic and Medicinal Chemistry (2017) 25(2), 646-657.