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2016 ; 15
(10
): 2266-2278
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PIAS1 Promotes Lymphomagenesis through MYC Upregulation
#MMPMID27239040
Rabellino A
; Melegari M
; Tompkins VS
; Chen W
; Van Ness BG
; Teruya-Feldstein J
; Conacci-Sorrell M
; Janz S
; Scaglioni PP
Cell Rep
2016[Jun]; 15
(10
): 2266-2278
PMID27239040
show ga
The MYC proto-oncogene is a transcription factor implicated in a broad range of
cancers. MYC is regulated by several post-translational modifications including
SUMOylation, but the functional impact of this post-translational modification is
still unclear. Here, we report that the SUMO E3 ligase PIAS1 SUMOylates MYC. We
demonstrate that PIAS1 promotes, in a SUMOylation-dependent manner, MYC
phosphorylation at serine 62 and dephosphorylation at threonine 58. These events
reduce the MYC turnover, leading to increased transcriptional activity.
Furthermore, we find that MYC is SUMOylated in primary B cell lymphomas and that
PIAS1 is required for the viability of MYC-dependent B cell lymphoma cells as
well as several cancer cell lines of epithelial origin. Finally, Pias1-null mice
display endothelial defects reminiscent of Myc-null mice. Taken together, these
results indicate that PIAS1 is a positive regulator of MYC.
|*Gene Expression Regulation, Neoplastic
[MESH]
|Animals
[MESH]
|Carcinogenesis/genetics/*pathology
[MESH]
|Cell Line
[MESH]
|Cell Proliferation
[MESH]
|Cell Survival
[MESH]
|Half-Life
[MESH]
|Humans
[MESH]
|Lymphoma, B-Cell/*genetics/*pathology
[MESH]
|Mice
[MESH]
|Phosphorylation
[MESH]
|Phosphothreonine/metabolism
[MESH]
|Protein Binding/genetics
[MESH]
|Protein Inhibitors of Activated STAT/*metabolism
[MESH]