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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
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SIRPA suppresses integrin-dependent virus endocytosis
Biorxiv : the Preprint Server for Biology
|April 27, 2026
Summary
Signal Regulatory Protein Alpha (SIRPA) inhibits New World arenavirus entry by blocking integrin signaling. Targeting this pathway offers potential therapies against RNA viruses that enter cells via low pH compartments.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- New World arenaviruses (NWAs) cause severe hemorrhagic fever with limited treatments.
- Viral entry involves cell surface receptors, endocytosis, and low pH compartments.
- Signal Regulatory Protein Alpha (SIRPA) previously shown to reduce NWA internalization.
Purpose of the Study:
- Investigate the role of the SIRPA/integrin signaling axis in NWA entry.
- Elucidate SIRPA's mechanism in blocking viral endocytosis.
- Identify potential therapeutic targets for NWA and similar RNA virus infections.
Main Methods:
- Examined proteins in the SIRPA/integrin pathway: SHP2, SFKs (FYN), FAK, and alpha-integrin.
- Assessed their role in viral endocytosis and SIRPA's inhibitory effect.
- Utilized drugs targeting the integrin signaling pathway in vitro and in vivo.
Main Results:
- Proteins in the SIRPA/integrin axis (SHP2, SFKs, FAK, alpha-integrin) are crucial for viral endocytosis.
- SIRPA inhibits NWA entry by blocking this specific signaling pathway.
- Integrins play a role in viral entry and SIRPA's interference with integrin signaling.
Conclusions:
- Defines a novel role for integrins in NWA entry.
- Provides insight into SIRPA's function in integrin-dependent processes like phagocytosis.
- Suggests targeting the integrin signaling pathway as a therapeutic strategy against RNA viruses trafficking to acidic compartments.
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