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Comprehensive functional analysis of the tousled-like kinase 2 frequently amplified in aggressive luminal breast cancers.


ABSTRACT: More aggressive and therapy-resistant oestrogen receptor (ER)-positive breast cancers remain a great clinical challenge. Here our integrative genomic analysis identifies tousled-like kinase 2 (TLK2) as a candidate kinase target frequently amplified in ?10.5% of ER-positive breast tumours. The resulting overexpression of TLK2 is more significant in aggressive and advanced tumours, and correlates with worse clinical outcome regardless of endocrine therapy. Ectopic expression of TLK2 leads to enhanced aggressiveness in breast cancer cells, which may involve the EGFR/SRC/FAK signalling. Conversely, TLK2 inhibition selectively inhibits the growth of TLK2-high breast cancer cells, downregulates ER?, BCL2 and SKP2, impairs G1/S cell cycle progression, induces apoptosis and significantly improves progression-free survival in vivo. We identify two potential TLK2 inhibitors that could serve as backbones for future drug development. Together, amplification of the cell cycle kinase TLK2 presents an attractive genomic target for aggressive ER-positive breast cancers.

SUBMITTER: Kim JA 

PROVIDER: S-EPMC5064015 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Comprehensive functional analysis of the tousled-like kinase 2 frequently amplified in aggressive luminal breast cancers.

Kim Jin-Ah JA   Tan Ying Y   Wang Xian X   Cao Xixi X   Veeraraghavan Jamunarani J   Liang Yulong Y   Edwards Dean P DP   Huang Shixia S   Pan Xuewen X   Li Kaiyi K   Schiff Rachel R   Wang Xiao-Song XS  

Nature communications 20161003


More aggressive and therapy-resistant oestrogen receptor (ER)-positive breast cancers remain a great clinical challenge. Here our integrative genomic analysis identifies tousled-like kinase 2 (TLK2) as a candidate kinase target frequently amplified in ∼10.5% of ER-positive breast tumours. The resulting overexpression of TLK2 is more significant in aggressive and advanced tumours, and correlates with worse clinical outcome regardless of endocrine therapy. Ectopic expression of TLK2 leads to enhan  ...[more]

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