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Biomedical subjects

R E SHOPE

Publications and source records attributed to R E SHOPE.

40 records · Page 3Linked to original sources
PubMed1953

An antiviral substance from Penicillium funiculosum. II. Effect of helenine upon infection in mice with Semliki Forest virus.

Helenine exerts a therapeutic effect against Semliki Forest virus infections of mice. Cures, that is to say the survival of treated animals, were more frequently observed in Semliki Forest virus infections than they were in SK virus infections. It is believed that this difference in end-result probably represented only a quantitative difference in the therapeutic effect of helenine against these two viruses and not a qualitative difference in its mechanism of therapeutic action. The findings reported in this paper with regard to the treatment of Semliki Forest virus infections with helenine parallel very closely those described in an accompanying paper which deals with the action of helenine on SK. virus infections.

Animals↗
PubMed1953

An antiviral substance from Penicillium funiculosum. III. General properties and characteristics of helenine.

Helenine is moderately stable in solution at refrigerator temperature and can be kept for long periods of time without evident loss of activity if stored frozen at the temperature of solid CO(2). It is filterable through a Seitz pad but not dialyzable. Crude SPS preparations of helenine do not lose activity when dried from the frozen state. Some conditions are described, however, which influence the preservation or inactivation of acetone-precipitated helenine when freeze-dried. Helenine is partially inactivated by exposure for 3 minutes to the temperature of a boiling water bath and is completely inactivated by autoclaving at 15 pounds' pressure for 15 minutes. The data presented suggest that helenine acts, either directly or by triggering some mechanism of the host itself, to destroy virus by a process which renders the latter non-antigenic. This effect may be exerted by action upon the virus itself or by interference with some stage in the developmental cycle of the virus. While the chemical nature of helenine is not known, the presence of a large proportion of polysaccharide in crude active preparations might suggest the possible importance of this class of substance in helenine activity. It is believed that helenine differs from the polysaccharide reported by Horsfall and McCarty and the penicillin impurity reported by Groupé and Rake to be active against certain viruses. It may be related, however, to the antiviral substance recently reported by Powell and his co-workers.

Antiviral Agents↗