Exquisite selectivity for human toll-like receptor 8 in substituted furo[2,3-c]quinolines.
Exquisite selectivity for human toll-like receptor 8 in substituted furo[2,3-c]quinolines.
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DOI:
10.1021/jm400694d
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发表时间:
2013-09-12
影响因子:
7.3
通讯作者:
David SA
中科院分区:
文献类型:
--
作者:
Kokatla HP;Sil D;Malladi SS;Balakrishna R;Hermanson AR;Fox LM;Wang X;Dixit A;David SA
Toll-like receptor (TLR)-8 agonists activate adaptive immune responses by inducing robust production of T helper 1-polarizing cytokines, suggesting that TLR8-active compounds may be promising candidate adjuvants. We synthesized and evaluated hitherto unexplored furo[2,3-c]quinolines and its regioisomeric furo[3,2-c]quinolines, derived via a tandem, one-pot Sonogashira coupling and intramolecular 5 endo-dig cyclization strategy, in a panel of primary screens. We observed a pure TLR8 agonistic activity profile in select furo[2,3-c]quinolines, with maximal potency conferred by a C2-butyl group (EC50: 1.6 µM); shorter, longer, or substituted homologues, as well as compounds bearing C1 substitutions were inactive, which was rationalized by docking studies using the recently-described crystal structure of human TLR8. The best-in-class compound displayed prominent proinflammatory cytokine induction (including interleukin-12 and interleukin-18), but was bereft of interferon-α inducing properties, confirming its high selectivity for human TLR8.
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