1887

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Volume 70, Issue 7

Studies on the Mechanism of the Interferon-mediated Antiviral State to Vesicular Stomatitis Virus in Resting Mouse Peritoneal Macrophages Free

Abstract

SUMMARY

We have analysed the expression of vesicular stomatitis virus (VSV) proteins in virus-infected freshly explanted mouse peritoneal macrophages (resistant to virus replication), macrophages aged (permissive for virus replication) and freshly explanted macrophages from mice treated with antibody to interferon (IFN) / (permissive for VSV replication). Our data showed that some VSV proteins (i.e. N/NS and G) were synthesized in virus-infected (1 p.f.u./cell) freshly harvested macrophages at early times after infection (3 to 6 h); the expression of such viral proteins was subsequently inhibited at 18 h post-infection. In contrast, a progressive increase in the expression of VSV proteins was observed in the macrophages aged and infected with VSV at 1 p.f.u./cell. Infection with a higher m.o.i. (16 p.f.u./cell) resulted in similar viral protein electrophoresis patterns for both aged macrophages and freshly explanted macrophages. Even at low m.o.i. a marked and progressive expression of all VSV proteins was observed in freshly harvested macrophages from mice treated with antibody to mouse IFN-./ Higher levels of oligo-2′,5′-adenylate synthetase (2-5AS) were found in freshly harvested macrophages than in either aged macrophages or those from mice treated with antibody to IFN. No dsRNA-dependent 67K protein kinase was detected in freshly harvested macrophages or peritoneal cells from untreated mice or mice treated with poly(rI).poly(rC) or Newcastle disease virus. The following conclusions can be drawn from these results. Low levels of spontaneous IFN–/ are responsible for the time-dependent inhibition of VSV protein synthesis in virus-infected freshly harvested macrophages; high levels of 2–5AS (in the absence of detectable levels of 67K protein kinase) appear to correlate with the progressive inhibition of VSV proteins; this natural antiviral state is highly effective only at low m.o.i.

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Keyword(s): interferon (MuIFN-α/β) , macrophages and NDV
© Society for General Microbiology 1989
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1989-07-01
2024-04-18
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Studies on the Mechanism of the Interferon-mediated Antiviral State to Vesicular Stomatitis Virus in Resting Mouse Peritoneal Macrophages
J. Gen. Virol. 70, 1899 (1989); https://doi.org/10.1099/0022-1317-70-7-1899
/content/journal/jgv/10.1099/0022-1317-70-7-1899
/content/journal/jgv/10.1099/0022-1317-70-7-1899
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