Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 62, Issue 13, Pages 6190-6213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jmedchem.9b00506
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Recruitment of suppressive CD4(+) FOXP3(+) regulatory T cells (T-reg) to the tumor microenvironment (TME) has the potential to weaken the antitumor response in patients receiving treatment with immuno-oncology (10) agents. Human T-reg express CCR4 and can be recruited to the TME through the CC chemokine ligands CCL17 and CCL22. In some cancers, T-reg accumulation correlates with poor patient prognosis. Preclinical data suggests that preventing the recruitment of T-reg and increasing the population of activated effector T cells (T-eff) in the TME can potentiate antitumor immune responses. We developed a novel series of potent, orally bioavailable small molecule antagonists of CCR4. From this series, several compounds exhibited high potency in distinct functional assays in addition to good in vitro and in vivo ADME properties. The design, synthesis, and SAR of this series and confirmation of its in vivo activity are reported.
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