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2016 ; 7
(ä): 10339
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A monoclonal antibody against KCNK9 K(+) channel extracellular domain inhibits
tumour growth and metastasis
#MMPMID26842342
Sun H
; Luo L
; Lal B
; Ma X
; Chen L
; Hann CL
; Fulton AM
; Leahy DJ
; Laterra J
; Li M
Nat Commun
2016[Feb]; 7
(ä): 10339
PMID26842342
show ga
Two-pore domain potassium (K2P) channels act to maintain cell resting membrane
potential--a prerequisite for many biological processes. KCNK9, a member of K2P
family, is implicated in cancer, owing to its overexpression in human tumours and
its ability to promote neoplastic cell survival and growth. However, KCNK9's
underlying contributions to malignancy remain elusive due to the absence of
specific modulators. Here we describe the development of monoclonal antibodies
against the KCNK9 extracellular domain and their functional effects. We show that
one antibody (Y4) with the highest affinity binding induces channel
internalization. The addition of Y4 to KCNK9-expressing carcinoma cells reduces
cell viability and increases cell death. Systemic administration of Y4
effectively inhibits growth of human lung cancer xenografts and murine breast
cancer metastasis in mice. Evidence for Y4-mediated carcinoma cell autonomous and
immune-dependent cytotoxicity is presented. Our study reveals that antibody-based
KCNK9 targeting is a promising therapeutic strategy in KCNK9-expressing
malignancies.
|Animals
[MESH]
|Antibodies, Monoclonal/*pharmacology
[MESH]
|Apoptosis/*drug effects
[MESH]
|Blotting, Western
[MESH]
|COS Cells
[MESH]
|Cell Cycle
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Proliferation/*drug effects
[MESH]
|Cell Survival/drug effects
[MESH]
|Chlorocebus aethiops
[MESH]
|Drug Screening Assays, Antitumor
[MESH]
|Flow Cytometry
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Immunohistochemistry
[MESH]
|In Vitro Techniques
[MESH]
|Membrane Potentials/drug effects
[MESH]
|Mice, Inbred BALB C
[MESH]
|Mice, Nude
[MESH]
|Microscopy, Confocal
[MESH]
|Neoplasm Metastasis
[MESH]
|Neoplasm Transplantation
[MESH]
|Neoplasms/genetics/*metabolism/pathology
[MESH]
|Potassium Channels, Tandem Pore Domain/*antagonists &
inhibitors/genetics/metabolism
[MESH]