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Identification by in situ hybridization of IFN-beta-producing murine macrophages obtained from high and low
J De Maeyer-Guignard1, F Marcucci, E De Maeyer
1Institut Curie-Biologie, Université de Paris-Sud, Orsay, France.
Abstract:
Resident peritoneal macrophages obtained from If-1h and If-1l mice were induced in vitro with Newcastle disease virus. Then, 3, 5 and 7 h after induction, the cells were fixed and analysed for the presence of Mu IFN-beta mRNA by in situ hybridization, using a 35S-labelled Mu IFN-beta cDNA as a probe. The number of cells that were scored positive was the same in cultures derived from high responder If-1h and from low responder If-1l mice, and reached 100% of the cells present in the cultures. This result highly suggests that low responder mice have the same number of IFN-producing cells as high responders, and that the difference in production is not due to an increased number of producer cells in high responders.
Insights
High and low responder mice possess similar numbers of interferon-beta (IFN-beta) producing cells. Differences in IFN-beta production are not attributed to the quantity of producer cells in high responder mice.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- Interferon-beta (IFN-beta) is a crucial cytokine in the innate immune response against viral infections.
- Understanding the cellular mechanisms regulating IFN-beta production is essential for developing effective antiviral strategies.
- Genetic variations can influence immune responses, leading to differences in cytokine production between individuals or strains.
Purpose of the Study:
- To investigate the cellular basis for differences in IFN-beta production between high responder (If-1h) and low responder (If-1l) mice.
- To determine if the number of IFN-beta producing cells differs between high and low responder mouse strains.
Main Methods:
- Resident peritoneal macrophages were isolated from If-1h and If-1l mice.
- Macrophages were stimulated in vitro with Newcastle disease virus (NDV).
- In situ hybridization using a 35S-labelled Mu IFN-beta cDNA probe was employed to detect Mu IFN-beta mRNA at 3, 5, and 7 hours post-induction.
Main Results:
- The percentage of Mu IFN-beta mRNA-positive cells was identical in cultures from both If-1h and If-1l mice, reaching 100% of the cells.
- This indicates that both high and low responder mice possess an equivalent number of cells capable of producing IFN-beta.
Conclusions:
- The observed differences in IFN-beta production between If-1h and If-1l mice are not due to a higher number of IFN-producing cells in high responders.
- The regulatory mechanisms controlling the *level* of IFN-beta production, rather than the *number* of producer cells, likely account for the differential responses.