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Intracellular development of membrane protein of influenza virus
Abstract:
The intracellular development of membrane protein (MP) of influenza A virus was investigated by immunofluorescent staining. Monospecific antiserum was prepared by immunizing rabbits with MP eluted from SDS-polyacrylamide gels of SDS-disrupted NWS virions. In the productive infection in clone 1-5C-4 cells, MP antigen was first detected over the whole cell at 4 hr after infection, concomitantly with the appearance of hemagglutinin (HA) antigen in the cytoplasm, and bright nuclear fluorescence was then observed. Nucleoprotein (NP) antigen was detected in the nucleus prior to the appearance of fluorescence of MP antigen and thereafter the cytoplasmic fluorescence developed. Late in infection, all of these three antigens were observed predominantly in the cytoplasm with stronger fluorescence at the cell surface. Essentially similar findings were obtained in the abortive infections in L cells and BHK cells. The above results suggest that the membrane protein of influenza A virus is present in the nucleus as well as in the cytoplasm of infected cells.
Insights
Influenza A virus membrane protein (MP) develops within infected cells. MP antigen appears throughout the cell, nucleus, and cytoplasm, suggesting its presence in both cellular compartments during viral replication.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- Influenza A virus is a significant human pathogen.
- Understanding viral protein trafficking is crucial for antiviral development.
- The intracellular localization of influenza A virus membrane protein (MP) has not been fully elucidated.
Purpose of the Study:
- To investigate the intracellular development and localization of influenza A virus membrane protein (MP).
- To determine the temporal and spatial distribution of MP during viral infection in host cells.
Main Methods:
- Immunofluorescent staining was employed to detect viral antigens.
- Monospecific antiserum against MP was generated in rabbits.
- Productive and abortive infections in various cell lines (1-5C-4, L, BHK) were analyzed.
Main Results:
- MP antigen was detected throughout the cell starting at 4 hours post-infection.
- Nuclear fluorescence for MP was observed, preceding cytoplasmic and cell surface localization.
- Hemagglutinin (HA) and Nucleoprotein (NP) antigens showed distinct temporal and spatial patterns, with NP detected in the nucleus early.
- Late in infection, MP, HA, and NP were predominantly found in the cytoplasm and at the cell surface.
Conclusions:
- Influenza A virus membrane protein (MP) is present in both the nucleus and cytoplasm of infected cells.
- MP localization changes dynamically during the viral replication cycle.
- These findings contribute to understanding the intracellular trafficking of influenza virus components.