Summary
Addition of heparin-Na+ as well as related substances of high and intermediate MW (Arteparon and polyanion SP54) 3 h after infection inhibit fusion from within (FFWI) induced by HSV strains with mutations in the syn 3 locus only. The concentration of heparin-Na+ required to inhibit FFWI is 10-fold higher (1 mg/ml) than that needed to inhibit adsorption. Instead of fusion, cell rounding is observed. The effect is readily reversible. A low MW heparin disaccharide is ineffective. Neomycin, at a concentration of 8 mM, inhibits FFWI induced by all HSV-1 but not HSV-2 strains, whereas adsorption is inhibited at 3 mM. We conclude from our observations that cell-cell fusion (FFWI) induced by syn 3 locus mutants of HSV-1 depends on a multistep mechanism. One may be constituted by pre-existing cell-cell connections or microfusions leading to cell rounding, whereas another may be active using newly appearing cell bridges during FFWI; also the three-dimensional structure of the cell membrane may be of importance. Moreover, the molecular mechanisms of FFWI induced by mutations in the syn 3 locus compared to the other 5 syn loci should be different.
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Seck, T., Lingen, M., Weise, K. et al. Evidence for a multistep mechanism for cell-cell fusion by herpes simplex virus with mutations in the syn 3 locus using heparin derivatives during fusion from within. Archives of Virology 136, 173–181 (1994). https://doi.org/10.1007/BF01538826
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DOI: https://doi.org/10.1007/BF01538826