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Updated: Feb 21, 2026
Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds
Published on: October 29, 2015
Studies of Lassa Virus Cell Entry
Antonella Pasquato1, Antonio Herrador Fernandez1, Stefan Kunz2
1Institute of Microbiology, University Hospital Center, University of Lausanne, Rue du Bugnon 48, CH-1011, Lausanne, Switzerland.
Abstract:
Host cell entry is the first and most fundamental step of every virus infection and represents a major barrier for zoonotic transmission and viral emergence. Targeting viral entry appears further as a promising strategy for therapeutic intervention. Several cellular receptors have been identified for Lassa virus, including dystroglycan, TAM receptor tyrosine kinases, and C-type lectins. Upon receptor binding, LASV enters the host cell via a largely unknown clathrin- and dynamin-independent endocytotic pathway that delivers the virus to late endosomes, where fusion occurs after engagement of a second, intracellular receptor, the late endosomal/lysosomal resident protein LAMP1. Here, we describe a series of experimental approaches to investigate LASV cell entry and to test candidate inhibitors for their action at this early and decisive step of infection.
Insights
Lassa virus (LASV) uses multiple cell receptors for entry, including LAMP1, via a unique endocytosis pathway. Researchers investigated this process to find new antiviral therapies targeting viral entry.
Area of Science:
- Virology
- Cell Biology
- Infectious Diseases
Background:
- Viral entry is crucial for infection and a target for therapeutics.
- Lassa virus (LASV) utilizes cell receptors like dystroglycan, TAM receptors, and C-type lectins for host cell entry.
- LASV entry involves a clathrin- and dynamin-independent pathway to late endosomes, requiring LAMP1 for fusion.
Purpose of the Study:
- To investigate the mechanisms of Lassa virus cell entry.
- To identify and test potential inhibitors of LASV entry.
Main Methods:
- Experimental approaches to study LASV cell entry.
- Testing candidate inhibitors for antiviral activity against LASV entry.
Main Results:
- Detailed characterization of LASV's receptor usage and entry pathway.
- Identification of key steps in LASV cell entry.
Conclusions:
- Understanding LASV entry is vital for controlling zoonotic transmission and viral emergence.
- Targeting LASV entry presents a promising therapeutic strategy.
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