Related Experiment Videos
Amiloride inhibition of human cytomegalovirus replication
M Fons1, M Nokta, S Cerruti-Sola
1Department of Microbiology, University of Texas Medical Branch, Galveston 77550.
Abstract:
Amiloride, an inhibitor of Na+/H+ exchange, interfered with cytomegalovirus (CMV) DNA synthesis, blocked the formation of nuclear inclusions, and reduced CMV infectious yields. The reduction of CMV infectious yields was concentration dependent with an ED90 of 46 microM. Amiloride at a concentration of 150 microM reduced CMV yields by about 100-fold. Reduction of infectious yields appeared to be related to interference with the formation of nuclear inclusions and to inhibition of CMV DNA synthesis. Nuclear inclusions were much reduced in size and demonstrated poorly defined cellulae in the amiloride-treated cells. CMV DNA synthesis was inhibited by approximately 70% when cells were treated with 150 microM amiloride. The reduction in CMV yields could not be related to the reported inhibitory effect of amiloride on protein synthesis. In amiloride (150 microM)-treated, CMV-infected cells, late, yet not immediate-early or early, protein synthesis was markedly decreased relative to untreated, CMV-infected cells. Accordingly, CMV DNA synthesis and the replication of CMV may be related to Na+ entry through an amiloride-sensitive pathway.
Insights
Amiloride inhibits cytomegalovirus (CMV) replication by blocking viral DNA synthesis and nuclear inclusion formation. This antiviral effect suggests a link between CMV replication and sodium ion entry via amiloride-sensitive pathways.
Area of Science:
- Virology
- Molecular Biology
- Pharmacology
Background:
- Cytomegalovirus (CMV) is a significant human pathogen.
- Viral replication relies on host cell machinery and specific viral proteins.
- Amiloride is known to inhibit Na+/H+ exchange.
Purpose of the Study:
- To investigate the effect of amiloride on CMV replication.
- To determine the mechanism by which amiloride impacts CMV.
- To explore the role of Na+ transport in CMV DNA synthesis.
Main Methods:
- Treatment of CMV-infected cells with varying concentrations of amiloride.
- Quantification of CMV infectious yields.
- Analysis of CMV DNA synthesis.
- Assessment of viral protein synthesis and nuclear inclusion formation.
Main Results:
- Amiloride significantly reduced CMV infectious yields in a dose-dependent manner (ED90 = 46 microM).
- Amiloride inhibited CMV DNA synthesis by approximately 70% at 150 microM.
- Amiloride treatment led to smaller, poorly defined nuclear inclusions and decreased late viral protein synthesis.
Conclusions:
- Amiloride exhibits potent antiviral activity against CMV.
- The antiviral effect is linked to the inhibition of CMV DNA synthesis and nuclear inclusion formation.
- CMV replication and DNA synthesis may depend on Na+ influx through amiloride-sensitive channels.