In response to the need for new antiviral agents, dendrimer-based molecules have been recognized as having a large number of potential therapeutic applications. They include peptide derivatized-dendrimers: hyperbranched synthetic well-defined molecules which consist of a peptidyl branching core and covalently attached surface functional peptides. However, few studies have addressed their applications as direct-acting antiviral agents. Here, we report on the ability of the peptide dendrimer SB105 and its derivative SB105_A10, to directly inhibit Herpes simplex type 1 (HSV-1) and type 2 (HSV-2) in vitro replication, with favorable selective indexes discerned for both compounds. Analysis of their mode of action revealed that SB105 and SB105_A10 prevent HSV-1 and HSV-2 attachment to target cells, whereas SB104, a dendrimer with a different amino acid sequence within the functional group and minimal antiviral activity, was ineffective in blocking HSV attachment. Moreover, both SB105 and SB105_A10 retained their ability to inhibit HSV adsorption at pH 3.0 and 4.0 and in the presence of 10% human serum proteins, conditions mimicking the physiological properties of the vagina, a potential therapeutic location for such compounds. The inhibition of HSV adsorption is likely to stem from the ability of SB105_A10 to bind to the glycosaminoglycan moiety of cell surface heparan sulfate proteoglycans, thereby blocking virion attachment to target cells. Finally, when combined with acyclovir in checkerboard experiments SB105_A10 exhibited highly synergistic activity. Taken together, these findings pose SB105 and SB105_A10 as promising candidates for the development of novel topical microbicides for the prevention of HSV infections.

Inhibition of Herpes Simplex virus type 1 and 2 infection by peptide-derivatized dendrimers

LUGANINI, ANNA;LANDOLFO, Santo Giuseppe;GRIBAUDO, Giorgio
2011-01-01

Abstract

In response to the need for new antiviral agents, dendrimer-based molecules have been recognized as having a large number of potential therapeutic applications. They include peptide derivatized-dendrimers: hyperbranched synthetic well-defined molecules which consist of a peptidyl branching core and covalently attached surface functional peptides. However, few studies have addressed their applications as direct-acting antiviral agents. Here, we report on the ability of the peptide dendrimer SB105 and its derivative SB105_A10, to directly inhibit Herpes simplex type 1 (HSV-1) and type 2 (HSV-2) in vitro replication, with favorable selective indexes discerned for both compounds. Analysis of their mode of action revealed that SB105 and SB105_A10 prevent HSV-1 and HSV-2 attachment to target cells, whereas SB104, a dendrimer with a different amino acid sequence within the functional group and minimal antiviral activity, was ineffective in blocking HSV attachment. Moreover, both SB105 and SB105_A10 retained their ability to inhibit HSV adsorption at pH 3.0 and 4.0 and in the presence of 10% human serum proteins, conditions mimicking the physiological properties of the vagina, a potential therapeutic location for such compounds. The inhibition of HSV adsorption is likely to stem from the ability of SB105_A10 to bind to the glycosaminoglycan moiety of cell surface heparan sulfate proteoglycans, thereby blocking virion attachment to target cells. Finally, when combined with acyclovir in checkerboard experiments SB105_A10 exhibited highly synergistic activity. Taken together, these findings pose SB105 and SB105_A10 as promising candidates for the development of novel topical microbicides for the prevention of HSV infections.
55
7
3231
3239
http://aac.asm.org/content/55/7/3231.long
antiviral activity; HSV-1; HSV-2; peptide derivatized dendrimers; HSPGs
Luganini A; Fabiole Nicoletto S; Pizzuto L; Pirri G; Giuliani A; Landolfo S; Gribaudo G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/84872
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