Apolipoprotein L9b (Apol9b) is an interferon-stimulated gene (ISG) that has antiviral activity and is weakly expressed in primary mouse neurons as compared to other cell types. Here, we show that both Apol9 isoforms (Apol9b and Apol9a) inhibit replication of Theiler's murine encephalomyelitis virus (TMEV) but not replication of vesicular stomatitis virus (VSV), Murid herpesvirus-4 (MuHV-4), or ...

The present findings indicate that the wide fluctuation observed in the antiviral activity of various crude helenine preparations may be attributable to the presence of varying amounts of inhibitor. Antiviral activity could be enhanced by removal of the inhibitor. A meaningful value for helenine titer in a preparation clearly should be determined in the inhibitor-free zone.

Kibdelosporangium albatum No. R761-7 (ATCC 55061) produced new antiviral antibiotics, cycloviracins B1 and B2. They show weak activity against Gram-positive bacteria and potent antiviral activity against herpes simplex virus type 1. Unique acylsaccharide structures were established for cycloviracins B1 and B2 by degradation and spectroscopic analysis.

BACKGROUND Cortex Phellodendri (C. Phellodendri), the dried trunk bark of Phellodendron amurense Ruprecht, has been known as a traditional herbal medicine, showing several bioactivities. However, antiviral activity of C. Phellodendri aqueous extract (CP) not reported in detail, particularly aiming the prophylactic effectiveness. METHODS In vitro CP antiviral activity evaluated against Influen...

Antiviral immunity in insects and plants is mediated by the RNA interference (RNAi) pathway in which viral long double-stranded RNA (dsRNA) is processed into small interfering RNAs (siRNAs) by Dicer enzymes. Although this pathway is evolutionarily conserved, its involvement in antiviral defense in mammals is the subject of debate. In vertebrates, recognition of viral RNA induces a sophisticated...

Partially purified methanolic extract of Cissus quadrangularis (belonging to Vitaceae member, South Indian medicinal plant) have been explored for antiviral activity and their phytochemical characterisation. In vitro antiviral activity against HSV type1 and 2, and Vero cells at non-cytotoxic concentration were determined. HSV1 and HSV2 showed more sensitivity against the partially purified comp...

In cell cultures previously treated with homologous interferon, the magnitude of antiviral activity and the degree of stimulation of aryl hydrocarbon hydroxylase induction appear to be directly related. In a highly purified mouse interferon preparation, the factor stimulating hydroxylase induction and the factor directing antiviral activity are inactivated by heating to 70 C or by treating with...

The threat of a worldwide influenza pandemic has greatly increased over the past decade with the emergence of highly virulent avian influenza strains. The increased frequency of drug-resistant influenza strains against currently available antiviral drugs requires urgent development of new strategies for antiviral therapy, too. The research in the field of therapeutic peptides began to develop e...

Intraperitoneal administration of 10-carboxymethyl-9-acridanone sodium salt (CMA) protected at least 50% of mice tested from otherwise lethal infections with Semliki forest, coxsackie B1, Columbia SK, Western equine encephalitis, herpes simplex, and pseudorabies viruses. The protective effect against influenza A2/Asian/J305 and coxsackie A21 viruses was less but was statistically significant. W...

Interferon stimulation of cells can activate several hundred target genes, many of which are required for antiviral protection. Promoter binding of tyrosine-phosphorylated (activated) Stat1 dimers is essential for gene induction, a process that often entails the oligomerization of Stat1 dimers via interactions of their aminoterminal domains. The mutation of a single residue (F77) in the N-domai...