Abstract:
:Advanced basal cell carcinomas (BCCs) frequently acquire resistance to Smoothened (SMO) inhibitors through unknown mechanisms. Here we identify SMO mutations in 50% (22 of 44) of resistant BCCs and show that these mutations maintain Hedgehog signaling in the presence of SMO inhibitors. Alterations include four ligand binding pocket mutations defining sites of inhibitor binding and four variants conferring constitutive activity and inhibitor resistance, illuminating pivotal residues that ensure receptor autoinhibition. In the presence of a SMO inhibitor, tumor cells containing either class of SMO mutants effectively outcompete cells containing the wild-type SMO. Finally, we show that both classes of SMO variants respond to aPKC-ι/λ or GLI2 inhibitors that operate downstream of SMO, setting the stage for the clinical use of GLI antagonists.
journal_name
Cancer Celljournal_title
Cancer cellauthors
Atwood SX,Sarin KY,Whitson RJ,Li JR,Kim G,Rezaee M,Ally MS,Kim J,Yao C,Chang AL,Oro AE,Tang JYdoi
10.1016/j.ccell.2015.02.002subject
Has Abstractpub_date
2015-03-09 00:00:00pages
342-53issue
3eissn
1535-6108issn
1878-3686pii
S1535-6108(15)00052-5journal_volume
27pub_type
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