Macrocyclic Hedgehog Pathway Inhibitors: Optimization of Cellular Activity and Mode of Action Studies
作者:Chris Dockendorff、Marek M. Nagiec、Michel Weïwer、Sara Buhrlage、Amal Ting、Partha P. Nag、Andrew Germain、Han-Je Kim、Willmen Youngsaye、Christina Scherer、Melissa Bennion、Linlong Xue、Benjamin Z. Stanton、Timothy A. Lewis、Lawrence MacPherson、Michelle Palmer、Michael A. Foley、José R. Perez、Stuart L. Schreiber
DOI:10.1021/ml300172p
日期:2012.10.11
Macrocyclic Hedgehog (Hh) pathway inhibitors have been discovered with improved potency and maximal inhibition relative to the previously reported macrocycle robotnikinin. Analogues were prepared using a modular and efficient build-couple-pair (BCP) approach, with a ring-closing metathesis step to form the macrocyclic ring. Varying the position of the macrocycle nitrogen and oxygen atoms provided inhibitors with improved activity in cellular assays; the most potent analogue was 29 (BRD-6851), with an IC50 of 0.4 mu M against C3H10T1/2 cells undergoing Hh-induced activation, as measured by Gli1 transcription and alkaline phosphatase induction. Studies with Patched knockout (Ptch(-/-)) cells and competition studies with the Smoothened (Smo) agonists SAG and purmorphamine demonstrate that in contrast to robotnikinin, select analogues are Smo antagonists.