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Membrane changes during viral infection
Abstract:
The effect of viruses on the surface membrane of susceptible cells during the entry and exit process has been studied. Haemolytic paramyxoviruses induce a non-specific leakage to low-molecular-weight compounds during entry; other viruses do not show this effect. During exit, no such changes occur with any virus so far studied: some viruses are released without any obvious change at all in surface membrane function; in other cases, uptake of some nutrients is altered and there is a fall in membrane potential. These results do not support the hypothesis that a generalized membrane leakiness is a prerequisite for the synthesis and release of virus particles.
Insights
Viruses affect cell membranes differently during entry and exit. Not all viruses cause membrane leakage, and generalized leakiness is not required for virus release, challenging previous hypotheses.
Area of Science:
- Virology
- Cell Biology
- Membrane Biophysics
Background:
- Viruses interact with host cell membranes during their life cycle.
- Previous hypotheses suggested generalized membrane leakiness might be necessary for viral replication and release.
Purpose of the Study:
- To investigate the effects of viral entry and exit on the surface membrane of susceptible host cells.
- To determine if viral activity causes non-specific membrane permeability changes.
- To test the hypothesis that generalized membrane leakiness is a prerequisite for virus synthesis and release.
Main Methods:
- Studied the surface membrane function of cells infected with various viruses.
- Monitored for changes in membrane permeability to low-molecular-weight compounds.
- Assessed nutrient uptake and membrane potential during viral exit.
Main Results:
- Haemolytic paramyxoviruses induced non-specific leakage of low-molecular-weight compounds during entry.
- Other viruses did not exhibit this non-specific leakage effect during entry.
- Viral exit did not consistently cause membrane changes; some viruses showed no effect, while others altered nutrient uptake and decreased membrane potential.
Conclusions:
- Viral effects on cell surface membranes vary significantly depending on the virus and the stage of the viral life cycle (entry vs. exit).
- The observed membrane alterations do not support the hypothesis that generalized membrane leakiness is a prerequisite for virus particle synthesis and release.
- Specific viral mechanisms, rather than general membrane disruption, likely govern virus-cell interactions.