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. 1998 Jul 15;17(14):3899–3908. doi: 10.1093/emboj/17.14.3899

A matrix-less measles virus is infectious and elicits extensive cell fusion: consequences for propagation in the brain.

T Cathomen 1, B Mrkic 1, D Spehner 1, R Drillien 1, R Naef 1, J Pavlovic 1, A Aguzzi 1, M A Billeter 1, R Cattaneo 1
PMCID: PMC1170725  PMID: 9670007

Abstract

Measles viruses (MV) can be isolated from the brains of deceased subacute sclerosing panencephalitis patients only in a cell-associated form. These viruses are often defective in the matrix (M) protein and always seem to have an altered fusion protein cytoplasmic tail. We reconstituted a cell-free, infectious M-less MV (MV-DeltaM) from cDNA. In comparison with standard MV, MV-DeltaM was considerably more efficient at inducing cell-to-cell fusion but virus titres were reduced approximately 250-fold. In MV-DeltaM-induced syncytia the ribonucleocapsids and glycoproteins largely lost co-localization, confirming the role of M protein as the virus assembly organizer. Genetically modified mice were inoculated with MV-DeltaM or with another highly fusogenic virus bearing glycoproteins with shortened cytoplasmic tails (MV-Delta(tails)). MV-DeltaM and MV-Delta(tails) lost acute pathogenicity but penetrated more deeply into the brain parenchyma than standard MV. We suggest that enhanced cell fusion may also favour the propagation of mutated, assembly-defective MV in human brains.

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