Smoothened variants explain the majority of drug resistance in basal cell carcinoma.

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 Cell

journal_title

Cancer cell

authors

Atwood SX,Sarin KY,Whitson RJ,Li JR,Kim G,Rezaee M,Ally MS,Kim J,Yao C,Chang AL,Oro AE,Tang JY

doi

10.1016/j.ccell.2015.02.002

subject

Has Abstract

pub_date

2015-03-09 00:00:00

pages

342-53

issue

3

eissn

1535-6108

issn

1878-3686

pii

S1535-6108(15)00052-5

journal_volume

27

pub_type

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