Degradation of polyomavirus JC T-antigen by stress involves the LIP isoform of C/EBP.
Cell Cycle
; 14(13): 2075-9, 2015.
Article
em En
| MEDLINE
| ID: mdl-26017382
ABSTRACT
Endoplasmic reticulum (ER) stress is caused by the accumulation of misfolded or unfolded proteins in the lumen of the endoplasmic reticulum. CCAAT/enhancer binding proteins are one of the cellular proteins whose expression is upregulated during ER stress. Previously, we have identified C/EBPbeta isoforms, especially LIP, as a negative regulator of polyomavirus JC (JCV), the causative agent of the demyelinating disease progressive multifocal leukoencephalopathy (PML). Here, we show that the induction of ER stress by thapsigargin increase the expression of endogenous LIP and the degradation of JCV T-antigen in a JCV-transgenic mouse tumor cell line. Our results also revealed that overexpression of LIP significantly reduced the level of T-Ag and this effect is reversed upon siRNA-mediated silencing of LIP. Immunoprecipitation/Western blot experiments indicated that LIP interacts with T-antigen directly. Treatment of cells that overexpress LIP with MG115, a proteasome inhibitor, partially rescued LIP-mediated degradation of T-antigen. Our observations point to a role of LIP in ER stress regulation of T-antigen stability and may open a new avenue to study host-virus interaction during ER stress.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Esteroide Isomerases
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Proteínas de Transporte
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Vírus JC
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Proteína beta Intensificadora de Ligação a CCAAT
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Estresse do Retículo Endoplasmático
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Antígenos Virais de Tumores
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article