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2016 ; 6
(ä): 32582
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Physapubescin selectively induces apoptosis in VHL-null renal cell carcinoma
cells through down-regulation of HIF-2? and inhibits tumor growth
#MMPMID27581364
Chen L
; Xia G
; Qiu F
; Wu C
; Denmon AP
; Zi X
Sci Rep
2016[Sep]; 6
(ä): 32582
PMID27581364
show ga
We have purified physapubescin, a predominant steroidal lactone, from medicinal
plant Physalis pubescens L., commonly named as "hairy groundcherry" in English
and "Deng-Long-Cao" in Chinese. Von Hippel-Lindau (VHL)-null 786-O, RCC4 and A498
Renal Cell Carcinoma (RCC) cell lines expressing high levels of Hypoxia Inducible
Factor (HIF)-2? are more sensitive to physapubescin-mediated apoptosis and growth
inhibitory effect than VHL wild-type Caki-2 and ACHN RCC cell lines. Restoration
of VHL in RCC4 cells attenuated the growth inhibitory effect of physapubescin.
Physapubescin decreases the expression of HIF-2? and increases the expression of
CCAAT/enhancer-binding protein homologus protein (CHOP), which leads to
up-regulation of death receptor 5 (DR5), activation of caspase-8 and -3, cleavage
of poly (ADP-Ribose) polymerase (PARP) and apoptosis. Under hypoxia conditions,
the apoptotic and growth inhibitory effects of physapubescin are further
enhanced. Additionally, physapubescin synergizes with TNF-related
apoptosis-inducing ligand (TRAIL) for markedly enhanced induction of apoptosis in
VHL-null 786-O cells but not in VHL wild-type Caki-2 cells. Physapubescin
significantly inhibited in vivo angiogenesis in the 786-O xenograft.
Physapubescin as a novel agent for elimination of VHL-null RCC cells via
apoptosis is warranted for further investigation.