scholarly journals Reciprocal Regulatory Interaction between Human Herpesvirus 8 and Human Immunodeficiency Virus Type 1

2001 ◽  
Vol 276 (16) ◽  
pp. 13427-13432 ◽  
Author(s):  
Li-Min Huang ◽  
Miao-Fen Chao ◽  
Mao-Yuan Chen ◽  
Hsiu-ming Shih ◽  
Yu-Ping Chiang ◽  
...  
1999 ◽  
Vol 179 (6) ◽  
pp. 1591-1592 ◽  
Author(s):  
Adele Caterino‐de‐Araujo ◽  
Maria Luisa Calabrò ◽  
Elizabeth de los Santos‐Fortuna ◽  
Jamal Suleiman ◽  
Luigi Chieco‐Bianchi

2001 ◽  
Vol 82 (8) ◽  
pp. 1965-1970 ◽  
Author(s):  
Elisabetta Caselli ◽  
Paola Menegazzi ◽  
Arianna Bracci ◽  
Monica Galvan ◽  
Enzo Cassai ◽  
...  

Human herpesvirus-8 (HHV-8) is a lymphotropic virus associated with several AIDS-related neoplasms. Two ORFs play a critical role in the regulation of virus replication: ORF50, encoding an immediate-early transcriptional activator, and ORF57, encoding a post-transcriptional regulator. We analysed their effects on the activation of the human immunodeficiency virus type 1 (HIV-1) LTR. ORF50 interacted synergically with tat, inducing a 10-fold enhancement of HIV-1 LTR transactivation. This effect occurred both in BCBL-1 cells, latently infected with HHV-8, and in HL3T1 cells, an epithelial cell line non-permissive to HHV-8 infection. Also, ORF57 enhanced tat-induced transactivation of HIV-1 LTR, but only in BCBL-1 cells, suggesting that its action was likely mediated by the induction of other viral functions. Finally, when both ORFs were expressed, the enhancement of transactivation induced by ORF50 was partially inhibited. The findings suggest that ORF57 can modulate ORF50 activity and that ORF50 may render biologically active small amounts of tat.


2003 ◽  
Vol 187 (4) ◽  
pp. 559-568 ◽  
Author(s):  
Brad P. Brayfield ◽  
Saul Phiri ◽  
Chipepo Kankasa ◽  
Jubra Muyanga ◽  
Hamakwa Mantina ◽  
...  

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