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Generation of recombinant rabies virus ERA strain applied to virus tracking in cell infection
ZHAO Dan-dan, SHUAI Lei, GE Jin-ying, WANG Jin-liang, WEN Zhi-yuan, LIU Ren-qiang, WANG Chong, WANG Xi-jun, BU Zhi-gao
2019, 18 (10): 2361-2368.   DOI: 10.1016/S2095-3119(19)62717-6
Abstract156)      PDF in ScienceDirect      
The mechanism of rabies virus (RABV) infection still needs to be further characterized.  RABV particle with self-fluorescent is a powerful viral model to visualize the viral infection process in cells.  Herein, based on a reverse genetic system of the Evelyn-Rokitnicki-Abelseth (rERA) strain, we generated a recombinant RABV rERA-N/mCherry strain that stably expresses an additional ERA nucleoprotein that fuses with the red fluorescent protein mCherry (N/mCherry).  The rERA-N/mCherry strain retained growth property similar to the parent strain rERA in vitro.  The N/mCherry expression showed genetic stability during passage into mouse neuroblastoma (NA) cells and did not change the virulence of the vector.  The rERA-N/mCherry strain was then utilized as a visual viral model to study the RABV-cell binding and internalization.  We directly observed the red self-fluorescence of rERA-N/mCherry particles binding to the cell surface, and further co-localizing with clathrin in the early stage of infection in NA cells by fluorescence microscopy.  Our results showed that the rERA-N/mCherry strain uses clathrin-dependent endocytosis to enter cells, which is consistent with the well-known mechanism of RABV invasion.  The recombinant RABV rERA-N/mCherry thus appears to have the potential to be an effective viral model to further explore the fundamental molecular mechanism of rabies neuropathogenesis.
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