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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
HSV-1 immune escapes in microglia by down-regulating GM130 to inhibit TLR3-mediated innate immune responses
Jia Liu1,2, Xiqian Chen1,2, Junxian Liu1,2
1Department of Neurology, Second Xiangya Hospital, Central South University, No. 139, Renmin Middle Road, Changsha, Hunan, China.
Background:
To investigate the mechanism of Golgi matrix protein 130(GM130) regulating the antiviral immune response of TLR3 after herpes simplex virus type 1(HSV-1) infection of microglia cells. We explored the regulatory effects of berberine on the immune response mediated by GM130 and TLR3.
Methods:
An in vitro model of HSV-1 infection was established by infecting BV2 cells with HSV-1.
Results:
Compared to the uninfected group, the Golgi apparatus (GA) fragmentation and GM130 decreased after HSV-1 infection; TLR3 increased at 6 h and began to decrease at 12 h after HSV-1 infection; the secretion of interferon-beta(IFN-β), tumour necrosis factor alpha(TNF-α), and interleukin-6(IL-6) increased after infection. Knockdown of GM130 aggravated fragmentation of the GA and caused TLR3 to further decrease, and the virus titer also increased significantly. GM130 knockdown inhibits the increase in TLR3 and inflammatory factors induced by TLR3 agonists and increases the viral titer. Overexpression of GM130 alleviated fragmentation of the GA induced by HSV-1, partially restored the levels of TLR3, and reduced viral titers. GM130 overexpression reversed the reduction in TLR3 and inflammatory cytokine levels induced by TLR3 inhibitors. Therefore, the decrease in GM130 levels caused by HSV-1 infection leads to increased viral replication by inhibiting TLR3-mediated innate immunity. Berberine can protect the GA and reverse the downregulation of GM130, as well as the downregulation of TLR3 and its downstream factors after HSV-1 infection, reducing the virus titer.
Conclusions:
In microglia, one mechanism of HSV-1 immune escape is disruption of the GM130/TLR3 pathway. Berberine protects the GA and enhances TLR3-mediated antiviral immune responses.
Insights
Herpes simplex virus type 1 (HSV-1) infection in microglia disrupts Golgi matrix protein 130 (GM130) and TLR3, impairing antiviral immunity. Berberine protects against HSV-1 by preserving GM130 and enhancing TLR3 immune responses.
Area of Science:
- Neuroimmunology
- Virology
- Cell Biology
Background:
- Herpes simplex virus type 1 (HSV-1) infection impacts microglia, key immune cells in the central nervous system.
- Golgi matrix protein 130 (GM130) plays a role in cellular structure and immune signaling.
- Toll-like receptor 3 (TLR3) is crucial for detecting viral pathogens and initiating antiviral responses.
Purpose of the Study:
- To elucidate the mechanism by which GM130 regulates TLR3-mediated antiviral immunity during HSV-1 infection in microglia.
- To investigate the potential immunomodulatory effects of berberine on the GM130-TLR3 pathway in HSV-1-infected microglia.
Main Methods:
- Establishment of an in vitro model using HSV-1 infection of BV2 microglia cells.
- Assessment of Golgi apparatus (GA) morphology, GM130 and TLR3 expression levels, and inflammatory cytokine secretion.
- Manipulation of GM130 levels through knockdown and overexpression, and evaluation of viral titers and immune responses.
Main Results:
- HSV-1 infection induced GA fragmentation and decreased GM130 levels, while initially increasing and then decreasing TLR3 expression.
- GM130 knockdown exacerbated GA fragmentation, reduced TLR3 and inflammatory cytokine levels, and increased viral titers.
- GM130 overexpression alleviated GA damage, partially restored TLR3 levels, and reduced viral loads, indicating GM130's protective role in TLR3-mediated immunity.
- Berberine treatment protected the GA, reversed GM130 and TLR3 downregulation, and reduced HSV-1 viral titers.
Conclusions:
- HSV-1 employs a mechanism of immune evasion in microglia by disrupting the GM130/TLR3 pathway.
- GM130 is essential for maintaining TLR3-mediated antiviral immune responses against HSV-1.
- Berberine demonstrates therapeutic potential by protecting the GA and enhancing TLR3-dependent antiviral immunity, offering a novel strategy against HSV-1 infection.
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