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Evidence for early membrane antigens in cytomegalovirus-infected cells
Abstract:
Human cytomegalovirus (HCMV) induces membrane antigens (MA) which are detectable by immunofluorescent techniques as early as 24 h after infection. These antigens appear on the surface of infected cells in non-permissive human epithelioid and animal cells in addition to permissive human cells. The synthesis of the MA occurs in the presence of a DNA synthesis inhibitor, whereas RNA and protein synthesis inhibitors prevent its formation completely. These results demonstrate that the MA is a newly synthesized protein coded by an early function of the viral genome.
Insights
Human cytomegalovirus (HCMV) induces early membrane antigens (MA) detectable on infected cells. These newly synthesized viral proteins are crucial for understanding HCMV infection dynamics.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Human cytomegalovirus (HCMV) is a common pathogen.
- HCMV infection establishes a lifelong relationship with the host.
- Early detection of viral components is critical for understanding pathogenesis.
Purpose of the Study:
- To investigate the early synthesis and expression of membrane antigens (MA) induced by HCMV.
- To characterize the nature of these induced antigens.
- To determine the viral genetic control over MA synthesis.
Main Methods:
- Immunofluorescence techniques were used to detect MA on infected cells.
- Experiments were conducted using permissive and non-permissive cell lines.
- The role of DNA, RNA, and protein synthesis inhibitors was assessed.
Main Results:
- HCMV-induced MA were detected as early as 24 hours post-infection.
- MA expression was observed on both permissive and non-permissive cells.
- MA synthesis required ongoing RNA and protein synthesis but not DNA synthesis.
Conclusions:
- The detected MA are newly synthesized proteins.
- These antigens are encoded by early functions of the HCMV genome.
- Understanding MA expression provides insights into early viral gene regulation.