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2015 ; 34
(10
): 1220-30
Nephropedia Template TP
gab.com Text
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English Wikipedia
Novel small molecules disrupting Hec1/Nek2 interaction ablate tumor progression
by triggering Nek2 degradation through a death-trap mechanism
#MMPMID24662830
Hu CM
; Zhu J
; Guo XE
; Chen W
; Qiu XL
; Ngo B
; Chien R
; Wang YV
; Tsai CY
; Wu G
; Kim Y
; Lopez R
; Chamberlin AR
; Lee EY
; Lee WH
Oncogene
2015[Mar]; 34
(10
): 1220-30
PMID24662830
show ga
Hec1 (highly expressed in cancer 1) or Nek2 (NIMA-related kinase 2) is often
overexpressed in cancers with poor prognosis. Both are critical mitotic
regulators, and phosphorylation of Hec1 S165 by Nek2 is required for proper
chromosome segregation. Therefore, inactivation of Hec1 and Nek2 by targeting
their interaction with small molecules represents an ideal strategy for tackling
these types of cancers. Here we showed that new derivatives of INH (inhibitor for
Nek2 and Hec1 binding) bind to Hec1 at amino acids 394-408 on W395, L399 and K400
residues, effectively blocking Hec1 phosphorylation on S165 by Nek2, and killing
cancer cells at the nanomolar range. Mechanistically, the D-box (destruction-box)
region of Nek2 specifically binds to Hec1 at amino acids 408-422, immediately
adjacent to the INH binding motif. Subsequent binding of Nek2 to INH-bound Hec1
triggered proteasome-mediated Nek2 degradation, whereas the Hec1 binding
defective Nek2 mutant, Nek2 R361L, resisted INH-induced Nek2 degradation. This
finding unveils a novel drug-action mechanism where the binding of INHs to Hec1
forms a virtual death-trap to trigger Nek2 degradation and eventually cell death.
Furthermore, analysis of the gene expression profiles of breast cancer patient
samples revealed that co-elevated expressions of Hec1 and Nek2 correlated with
the shortest survival. Treatment of mice with this kind of tumor with INHs
significantly suppressed tumor growth without obvious toxicity. Taken together,
the new INH derivatives are suitable for translation into clinical application.