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2016 ; 7
(5
): 6105-20
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Thrombospondin-1 might be a therapeutic target to suppress RB cells by regulating
the DNA double-strand breaks repair
#MMPMID26756218
Chen P
; Yu N
; Zhang Z
; Zhang P
; Yang Y
; Wu N
; Xu L
; Zhang J
; Ge J
; Yu K
; Zhuang J
Oncotarget
2016[Feb]; 7
(5
): 6105-20
PMID26756218
show ga
Retinoblastoma (RB) arises from the retina, and its growth usually occurs under
the retina and toward the vitreous. Ideal therapy should aim to inhibit the tumor
and protect neural cells, increasing the patient's life span and quality of life.
Previous studies have demonstrated that Thrombospondin-1 (TSP-1) is associated
with neurogenesis, neovascularization and tumorigenesis. However, at present, the
bioactivity of TSP-1 in retinoblastoma has not been defined. Herein, we
demonstrated that TSP-1 was silenced in RB cell lines and clinical tumor samples.
HDAC inhibitor, Trichostatin A (TSA), could notably transcriptionally up-regulate
TSP-1 in RB cells, WERI-Rb1 cells and Y79 cells. Moreover, we found human
recombinant TSP-1 (hTSP-1) could significantly inhibit the cell viability of RB
cells both in vitro and in vivo. Interestingly, hTSP-1 could significantly induce
the expression of ?-H2AX, a well-characterized in situ marker of DNA
double-strand breaks (DSBs) in RB cells. The DNA NHEJ pathway in WERI-Rb1 cells
could be significantly inhibited by hTSP-1. A mutation in Rb1 might be involved
in the hTSP-1-medicated ?-H2AX increasing in WERI-Rb1 cells. Furthermore, hTSP-1
could inhibit RB cells while promoting retinal neurocyte survival in the neuronal
and retinoblastoma cell co-culture system. As such, TSP-1 may become a
therapeutic target for treatment of retinoblastoma.