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2018 ; 12
(3
): 356-372
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Inhibition of VEGF-dependent angiogenesis and tumor angiogenesis by an optimized
antibody targeting CLEC14a
#MMPMID29316206
Kim TK
; Park CS
; Jang J
; Kim MR
; Na HJ
; Lee K
; Kim HJ
; Heo K
; Yoo BC
; Kim YM
; Lee JW
; Kim SJ
; Kim ES
; Kim DY
; Cha K
; Lee TG
; Lee S
Mol Oncol
2018[Mar]; 12
(3
): 356-372
PMID29316206
show ga
The C-type lectin-like domain of CLEC14a (CLEC14a-C-type lectin-like domain
[CTLD]) is a key domain that mediates endothelial cell-cell contacts in
angiogenesis. However, the role of CLEC14a-CTLD in pathological angiogenesis has
not yet been clearly elucidated. In this study, through
complementarity-determining region grafting, consecutive deglycosylation, and
functional isolation, we generated a novel anti-angiogenic human monoclonal
antibody that specifically targets CLEC14a-CTLD and that shows improved stability
and homogeneity relative to the parental antibody. We found that this antibody
directly inhibits CLEC14a-CTLD-mediated endothelial cell-cell contact and
simultaneously downregulates expression of CLEC14a on the surface of endothelial
cells. Using various in vitro and in vivo functional assays, we demonstrated that
this antibody effectively suppresses vascular endothelial growth factor
(VEGF)-dependent angiogenesis and tumor angiogenesis of SNU182 human
hepatocellular carcinoma, CFPAC-1 human pancreatic cancer, and U87 human glioma
cells. Furthermore, we also found that this antibody significantly inhibits tumor
angiogenesis of HCT116 and bevacizumab-adapted HCT116 human colorectal cancer
cells. These findings suggest that antibody targeting of CLEC14a-CTLD has the
potential to suppress VEGF-dependent angiogenesis and tumor angiogenesis and that
CLEC14a-CTLD may be a novel anti-angiogenic target for VEGF-dependent
angiogenesis and tumor angiogenesis.