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2018 ; 9
(6
): 579
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Novel peptide GX1 inhibits angiogenesis by specifically binding to
transglutaminase-2 in the tumorous endothelial cells of gastric cancer
#MMPMID29785022
Lei Z
; Chai N
; Tian M
; Zhang Y
; Wang G
; Liu J
; Tian Z
; Yi X
; Chen D
; Li X
; Yu P
; Hu H
; Xu B
; Jian C
; Bian Z
; Guo H
; Wang J
; Peng S
; Nie Y
; Huang N
; Hu S
; Wu K
Cell Death Dis
2018[May]; 9
(6
): 579
PMID29785022
show ga
The clinical application of GX1, an optimal gastric cancer (GC) targeting
peptide, is greatly limited because its receptor in the GC vasculature is
unknown. In this study, we screened the candidate receptor of GX1,
transglutaminase-2(TGM2), by co-immunoprecipitation (co-IP) combined with mass
spectrometry. We found that TGM2 was up-regulated in GC vascular endothelial
cells and that GX1 receptor expression was suppressed correspondingly after TGM2
downregulation. A highly consistent co-localization of GX1 receptor and TGM2 was
detected at both the cellular and tissue levels. High TGM2 expression was evident
in GC tissues from patients with poor prognosis. After TGM2 downregulation, the
GX1-mediated inhibition of proliferation and migration and the induction of the
apoptosis of GC vascular endothelial cells were weakened or even reversed.
Finally, we observed that GX1 could inhibit the GTP-binding activity of TGM2 by
reducing its intracellular distribution and downregulating its downstream
molecular targets (nuclear factor-kappa B, NF-?B; hypoxia-inducible factor 1-?,
HIF1?) in GC vascular endothelial cells. Our study confirms that peptide GX1 can
inhibit angiogenesis by directly binding to TGM2, subsequently reducing the
GTP-binding activity of TGM2 and thereby suppressing its downstream
pathway(NF-?B/HIF1?). Our conclusions suggest that GX1/TGM2 may provide a new
target for the diagnosis and treatment of GC.