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Differential susceptibility of spleen focus-forming virus and murine leukemia viruses to ansamycin antibiotics.

Abstract
The streptovaricin complex (SvCx) and rifamycin SV derivatives display potent antiviral activity against the polycythemic strain of Friend leukemia virus (FV-P), as measured by a reduction in the number of spleen foci produced in mice. Such reductions may be explained by inactivation of functions of (i) the spleen focus-forming virus (SFFV), (ii) its "helper" murine leukemia virus (MuLV), or (iii) both viruses normally present in FV-P. We noted that preincubation of FV-P with fractionation products of SvCx, or derivatives of rifamycin SV, at low concentrations (3 to 5 mug/ml) reduces the number of spleen foci 80 to 97%, whereas titers of MuLV (from the same inoculum) remain unaffected (MuLV titers were measured by XC, S(+)L(-), and "helper activity" assays). Our findings indicate a remarkable biological selectivity of ansamycins, as well as nonansamycin components of SvCx, against the transforming and defective spleen focus-forming virus as compared to MuLV. Thus, the drugs might be useful in distinguishing other types of oncornaviruses.
AuthorsJ S Horoszewicz, S S Leong, W A Carter
JournalAntimicrobial agents and chemotherapy (Antimicrob Agents Chemother) Vol. 12 Issue 1 Pg. 4-10 (Jul 1977) ISSN: 0066-4804 [Print] United States
PMID18986 (Publication Type: Case Reports, Comparative Study, Journal Article, Research Support, U.S. Gov't, P.H.S.)
Chemical References
  • Rifamycins
  • Viral Proteins
  • Streptovaricin
Topics
  • Animals
  • Cell Line
  • Female
  • Friend murine leukemia virus (drug effects, radiation effects)
  • Leukemia Virus, Murine (drug effects, radiation effects)
  • Mice
  • Mice, Inbred BALB C
  • Mice, Inbred DBA
  • Rifamycins (pharmacology)
  • Streptovaricin (pharmacology)
  • Ultraviolet Rays
  • Viral Proteins (pharmacology)

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