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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Virol
2005 ; 79
(4
): 2033-41
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Persistent borna disease virus infection confers instability of HSP70 mRNA in
glial cells during heat stress
#MMPMID15681405
Yamashita M
; Kamitani W
; Yanai H
; Ohtaki N
; Watanabe Y
; Lee BJ
; Tsuji S
; Ikuta K
; Tomonaga K
J Virol
2005[Feb]; 79
(4
): 2033-41
PMID15681405
show ga
Borna disease virus (BDV) is a highly neurotropic RNA virus that causes
neurological disorders in many vertebrate species. Although BDV readily
establishes lasting persistence, persistently infected cells maintain an
apparently normal cell phenotype in terms of morphology, viability, and
proliferation. In this study, to understand the regulation of stress responses in
BDV infection, we investigated the expression of heat shock proteins (HSPs) in
glial cells persistently infected with BDV. Interestingly, we found that BDV
persistence did not upregulate HSP70 expression even in cells treated with heat
stress. Furthermore, BDV-infected glial cells exhibited rapid rounding and
detachment from the culture plate under various stressful conditions.
Immunofluorescence analysis demonstrated that heat stress rapidly disrupts the
cell cytoskeleton only in persistently infected cells, suggesting a lack of
thermotolerance. Intriguingly, we found that although persistently infected glial
cells expressed HSP70 mRNA after heat stress, its expression rapidly disappeared
during the recovery period. These observations indicated that persistent BDV
infection may affect the stability of HSP70 mRNA. Finally, we found that the
double-stranded RNA-dependent protein kinase (PKR) is expressed at a constant
level in persistently infected cells with or without heat shock. Considering the
interrelationship between HSP70 and PKR production, our data suggest that BDV
infection disturbs the cellular stress responses to abolish antiviral activities
and maintain persistence.