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Effect of magnesium on replication of rhinovirus HGP
Abstract:
It is known that plaque formation by some rhinoviruses is greatly enhanced by increasing the concentration of MgCl(2). The mechanism of this action was studied by investigating the effects of MgCl(2) on rhinovirus HGP adsorption, growth, clumping, thermal stability, and cell susceptibility to viral cytopathic effect. The latent period was at most 7 hr, whether virus was propagated in cells maintained in 0.8 or 30 mm MgCl(2), but virus release was 8- to 310-fold greater in the presence of 30mm MgCl(2), depending on initial multiplicity. Intracellular virus content appeared unaffected by Mg(++) and reached maximal yield (plateau phase) at about 10 hr. Viral adsorption was increased when cells were maintained in 30mm Mg(++). It is likely that the two effects of magnesium, enhanced adsorption and increased virus release, both contribute to enhancement of plaque formation.
Insights
Magnesium chloride (MgCl2) significantly enhances rhinovirus plaque formation by increasing viral adsorption to cells and boosting virus release. This study investigated the underlying mechanisms of MgCl2
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Rhinoviruses are a major cause of the common cold.
- Plaque formation is a key indicator of viral replication and infectivity.
- Magnesium chloride (MgCl2) is known to enhance rhinovirus plaque formation.
Purpose of the Study:
- To elucidate the mechanism by which MgCl2 enhances rhinovirus plaque formation.
- To investigate the effects of MgCl2 on rhinovirus HGP adsorption, growth, clumping, thermal stability, and cell susceptibility.
- To determine the specific roles of viral adsorption and release in MgCl2-mediated enhancement.
Main Methods:
- Propagation of rhinovirus HGP in cell cultures with varying MgCl2 concentrations (0.8 mM vs. 30 mM).
- Measurement of latent period, virus release, intracellular virus content, and viral adsorption.
- Assessment of viral clumping, thermal stability, and cell susceptibility to cytopathic effect.
Main Results:
- MgCl2 significantly increased rhinovirus release (8- to 310-fold) without affecting intracellular virus content.
- Viral adsorption to host cells was enhanced in the presence of 30 mM MgCl2.
- The latent period of viral replication remained consistent across different MgCl2 concentrations.
Conclusions:
- Enhanced viral adsorption and increased virus release are the primary mechanisms by which MgCl2 enhances rhinovirus plaque formation.
- Magnesium ions play a crucial role in optimizing rhinovirus infectivity and replication efficiency.
- Understanding these mechanisms can inform antiviral strategies targeting rhinovirus infections.