Identification and characterization of human herpesvirus 8 open reading frame K9 viral interferon regulatory factor by a monoclonal antibody.

Abstract

OBJECTIVE To identify and characterize an open reading frame (ORF) in association with its mRNA and a coding protein recognized by anti-human herpesvirus 8 (HHV-8) monoclonal antibody B291. STUDY DESIGN/METHODS The antigen detected by B291 was characterized by immunofluorescence method, Western blot analysis, laser confocal microscopy, and immunohistology cDNA of the protein was identified by immunoscreening the HHV-8 cDNA library with B291 and sequenced. Structure and kinetics of the mRNA expression was investigated by 5',3' rapid amplification of cDNA ends (RACE) and Northern blot analysis. RESULTS Viral interferon regulatory factor (vIRF; approximately 50 kd) was a protein recognized by B291. It was detected in 12-O-tetradecanoyl phorbol-13 acetate (TPA)-induced, but not uninduced, HHV-8-infected cell lines (BCBL-1 and BCP-1) and the tumor cells obtained from a SCID mouse injected with uninduced BCBL-1. The expression of vIRF was predominantly in the nucleus and was partially diminished by phosphonoformic acid (PFA) treatment, whereas the mRNA (approximately 2.4 kb) was accumulated. CONCLUSIONS vIRF is an early protein expressed in the nucleus and may be involved in Kaposi's sarcoma tumor formation.

Cite this paper

@article{Inagi1999IdentificationAC, title={Identification and characterization of human herpesvirus 8 open reading frame K9 viral interferon regulatory factor by a monoclonal antibody.}, author={Reiko Inagi and Takashi Okuno and Masahiro Ito and J Chen and Yoshihide Mori and Mansoor Haque and Peishan Zou and Hiroaki Yagi and S Kiniwa and Toshiaki Saida and Yoshito Ueyama and Kazuhiko Hayashi and Koichi Yamanishi}, journal={Journal of human virology}, year={1999}, volume={2 2}, pages={63-71} }