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Cellular RNA is not degraded in interferon-treated HeLa cells after poliovirus infection
Abstract:
A drastic inhibition of protein synthesis occurs in HeLa cells treated with human lymphoblastoid interferon and infected with poliovirus. At the time when this inhibition has been established no degradation of 32P-labelled ribosomal RNA can be detected. Isolation of the mRNAs from poliovirus-infected cells plus or minus interferon treatment, followed by translation in a reticulocyte lysate indicates that cellular mRNAs remain active. These results suggest that gross degradation of cellular RNA does not occur in interferon-treated poliovirus-infected HeLa cells and that a non-specific nuclease induced by 2'-5' A is not responsible for the inhibition of protein synthesis observed.
Insights
Human lymphoblastoid interferon halts protein synthesis in poliovirus-infected HeLa cells. This inhibition is not due to RNA degradation, as cellular messenger RNAs remain active, suggesting other mechanisms are at play.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Interferons are crucial antiviral proteins.
- Poliovirus infection significantly impacts cellular processes, including protein synthesis.
- HeLa cells are a common model for studying viral infections and cellular responses.
Purpose of the Study:
- To investigate the mechanism behind protein synthesis inhibition in interferon-treated, poliovirus-infected HeLa cells.
- To determine if RNA degradation is responsible for the observed inhibition.
- To assess the activity of cellular messenger RNAs under these conditions.
Main Methods:
- Treatment of HeLa cells with human lymphoblastoid interferon and poliovirus infection.
- Analysis of 32P-labelled ribosomal RNA for degradation.
- Isolation and translation of messenger RNAs (mRNAs) in a reticulocyte lysate system.
Main Results:
- Protein synthesis was drastically inhibited in treated cells.
- No degradation of ribosomal RNA was detected during the inhibition period.
- Isolated cellular mRNAs remained active when translated in vitro, indicating their integrity.
Conclusions:
- Gross degradation of cellular RNA is not the cause of protein synthesis inhibition.
- A non-specific nuclease induced by 2'-5' A is unlikely to be responsible for the observed effect.
- The mechanism of inhibition likely involves post-transcriptional or translational regulation beyond gross RNA degradation.