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2016 ; 36
(12
): 1803-17
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Parallel Regulation of von Hippel-Lindau Disease by pVHL-Mediated Degradation of
B-Myb and Hypoxia-Inducible Factor ?
#MMPMID27090638
Okumura F
; Uematsu K
; Byrne SD
; Hirano M
; Joo-Okumura A
; Nishikimi A
; Shuin T
; Fukui Y
; Nakatsukasa K
; Kamura T
Mol Cell Biol
2016[Jun]; 36
(12
): 1803-17
PMID27090638
show ga
pVHL, the protein product of the von Hippel-Lindau (VHL) tumor suppressor gene,
is a ubiquitin ligase that targets hypoxia-inducible factor ? (HIF-?) for
proteasomal degradation. Although HIF-? activation is necessary for VHL disease
pathogenesis, constitutive activation of HIF-? alone did not induce renal clear
cell carcinomas and pheochromocytomas in mice, suggesting the involvement of an
HIF-?-independent pathway in VHL pathogenesis. Here, we show that the
transcription factor B-Myb is a pVHL substrate that is degraded via the
ubiquitin-proteasome pathway and that vascular endothelial growth factor (VEGF)-
and/or platelet-derived growth factor (PDGF)-dependent tyrosine 15
phosphorylation of B-Myb prevents its degradation. Mice injected with B-Myb
knockdown 786-O cells developed dramatically larger tumors than those bearing
control cell tumors. Microarray screening of B-Myb-regulated genes showed that
the expression of HIF-?-dependent genes was not affected by B-Myb knockdown,
indicating that B-Myb prevents HIF-?-dependent tumorigenesis through an
HIF-?-independent pathway. These data indicate that the regulation of B-Myb by
pVHL plays a critical role in VHL disease.