How Dengue Virus Circumvents Innate Immunity

Area of Science:

• Innate immunity and viral pathogenesis
• Molecular mechanisms of host-pathogen interactions
• Antiviral signaling pathways

Background:

• Innate immunity is the host's primary defense against viral infections, involving pattern recognition receptors that trigger cytokine production.
• Dengue virus (DENV) is known to antagonize the host interferon (IFN) system, acting as a weak IFN inducer.
• DENV infection activates both RNA-sensing (RIG-I-like receptors) and DNA-sensing (cGAS-STING) pathways, despite lacking a DNA phase.

Purpose of the Study:

• To review the multifaceted strategies employed by DENV to escape innate immune surveillance.
• To elucidate how DENV manipulates host RNA and DNA sensing pathways to suppress antiviral responses.
• To discuss the role of mitochondrial dynamics in DENV-mediated innate immune evasion.

Main Methods:

• Literature review of studies on DENV-host interactions and innate immunity.
• Analysis of viral mechanisms targeting pattern recognition receptor signaling pathways.
• Examination of DENV's impact on interferon production and signaling.

Main Results:

• DENV antagonizes innate immunity by targeting RLR-MAVS and cGAS-STING signaling pathways to reduce IFN production.
• DENV inhibits IFN action by interfering with transcription factors like IFN regulatory factor and STAT.
• Viral RNA modification, viral protein activity, and post-translational modifications of cellular factors contribute to DENV's immune evasion.

Conclusions:

• DENV employs sophisticated strategies to actively subvert host innate immunity at multiple levels, including initial recognition and subsequent IFN signaling.
• Understanding these evasion mechanisms is crucial for developing effective antiviral therapies against DENV.
• The interplay between DENV, host sensing pathways, and mitochondrial dynamics represents a key area for future research.