title: Kinome screening for regulators of the estrogen receptor identifies LMTK3 as a new therapeutic target in breast cancer.
abstract: Therapies targeting estrogen receptor α (ERα, encoded by ESR1) have transformed the treatment of breast cancer. However, large numbers of women relapse, highlighting the need for the discovery of new regulatory targets modulating ERα pathways. An siRNA screen identified kinases whose silencing alters the estrogen response including those previously implicated in regulating ERα activity (such as mitogen-activated protein kinase and AKT). Among the most potent regulators was lemur tyrosine kinase-3 (LMTK3), for which a role has not previously been assigned. In contrast to other modulators of ERα activity, LMTK3 seems to have been subject to Darwinian positive selection, a noteworthy result given the unique susceptibility of humans to ERα+ breast cancer. LMTK3 acts by decreasing the activity of protein kinase C (PKC) and the phosphorylation of AKT (Ser473), thereby increasing binding of forkhead box O3 (FOXO3) to the ESR1 promoter. LMTK3 phosphorylated ERα, protecting it from proteasomal degradation in vitro. Silencing of LMTK3 reduced tumor volume in an orthotopic mouse model and abrogated proliferation of ERα+ but not ERα- cells, indicative of its role in ERα activity. In human cancers, LMTK3 abundance and intronic polymorphisms were significantly associated with disease-free and overall survival and predicted response to endocrine therapies. These findings yield insights into the natural history of breast cancer in humans and reveal LMTK3 as a new therapeutic target.
authors: Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK. g.giamas@imperial.ac.uk
authors: Georgios
authors: G
authors: Giamas
authors: Aleksandra
authors: A
authors: Filipović
authors: Jimmy
authors: J
authors: Jacob
authors: Walter
authors: W
authors: Messier
authors: Hua
authors: H
authors: Zhang
authors: Dongyun
authors: D
authors: Yang
authors: Wu
authors: W
authors: Zhang
authors: Belul Assefa
authors: BA
authors: Shifa
authors: Andrew
authors: A
authors: Photiou
authors: Cathy
authors: C
authors: Tralau-Stewart
authors: Leandro
authors: L
authors: Castellano
authors: Andrew R
authors: AR
authors: Green
authors: R Charles
authors: RC
authors: Coombes
authors: Ian O
authors: IO
authors: Ellis
authors: Simak
authors: S
authors: Ali
authors: Heinz-Josef
authors: HJ
authors: Lenz
authors: Justin
authors: J
authors: Stebbing
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