NDLI: Human Parainfluenza Virus Type 3 Inhibits Gamma Interferon-Induced Major Histocompatibility Complex Class II Expression Directly and by Inducing Alpha/Beta Interferon

Content Provider	PubMed Central
Author	Gao, Jing De, Bishnu P. Han, Yulong Choudhary, Suresh Ransohoff, Richard Banerjee, Amiya K.
Copyright Year	2001
Abstract	Human parainfluenza virus type 3 (HPIV3) is one of the major causes of bronchiolitis, pneumonia, and croup in newborns and infants. Cellular immunity involving major histocompatibility complex (MHC) class I and class II molecules plays an important role in controlling virus infection. Several viruses have been shown to down-regulate gamma interferon (IFN-γ)-mediated MHC class II expression. In this communication, we show that HPIV3 strongly inhibits the IFN-γ-induced MHC class II expression in HT1080 human fibrosarcoma cells. The culture supernatant of HPIV3-infected cells also inhibited IFN-γ-induced MHC class II expression, a phenomenon that was found to be due, in large part, to alpha/beta interferon (IFN-α/β). Expression of MHC class I and intercellular adhesion molecule 1 occurred efficiently in cells simultaneously infected with HPIV3 and treated with IFN-γ, indicating that the inhibitory effect of HPIV3 was specific to MHC class II. STAT1 activation was not affected by HPIV3 at early postinfection times but was partially inhibited at later times. These data suggested that the potent inhibition of MHC class II expression was, in major part, due to a defect downstream of STAT1 activation in the IFN-γ-induced MHC class II expression pathway. Class II transactivator (CIITA) is the unique mediator of IFN-γ-induced transcription from the MHC class II promoter. By RNase protection analysis, CIITA expression was found to be strongly inhibited in HPIV3-infected cells. The culture supernatant containing IFN-α/β, on the other hand, inhibited MHC class II expression without affecting STAT1 and CIITA expression. These data indicate that HPIV3 inhibits IFN-γ-induced MHC class II expression primarily by the viral gene products targeting CIITA and additionally by inducing IFN-α/β to target one or more steps further downstream.
Related Links	http://dx.doi.org/10.1128/jvi.75.3.1124-1131.2001
Ending Page	1131
Page Count	8
Starting Page	1124
File Format	PDF
ISSN	0022538X
e-ISSN	10985514
Journal	Journal of Virology
Issue Number	3
Volume Number	75
Language	English
Publisher	American Society for Microbiology
Publisher Date	2001-02-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Immunology Virology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Virology Immunology Microbiology Insect Science

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