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Improved chimaeric mouse model confirms that resident peritoneal macrophages are derived solely from bone marrow
Abstract:
The origin of resident peritoneal macrophages was studied in radiation mouse chimaeras with and without reconstitution of the peritoneum with viable isogeneic peritoneal cells. The selection of host and donor strains were such that the isoenzymes of glucose-6-phosphate isomerase could be used to distinguish host from donor bone marrow derived cells. It was found that the resident peritoneal macrophages were completely replaced by bone marrow donor derived cells within 5-6 weeks. There was little difference between the results from mice which had been additionally reconstituted with peritoneal cells and those which were not.
Insights
Resident peritoneal macrophages originate from bone marrow. Studies in radiation mouse chimeras show complete replacement by donor cells within 5-6 weeks, regardless of peritoneal cell reconstitution.
Area of Science:
- Immunology
- Cell Biology
- Hematopoiesis
Background:
- Resident peritoneal macrophages are crucial for immune surveillance and tissue homeostasis within the abdominal cavity.
- Understanding the origin and turnover of these macrophages is key to comprehending peritoneal immunity.
Purpose of the Study:
- To investigate the origin of resident peritoneal macrophages.
- To determine if peritoneal macrophages are self-renewing or derived from circulating precursors.
Main Methods:
- Utilized radiation mouse chimeras, distinguishing host and donor cells using glucose-6-phosphate isomerase isoenzymes.
- Compared macrophage populations in mice with and without peritoneal reconstitution post-irradiation.
Main Results:
- Resident peritoneal macrophages were fully replaced by bone marrow-derived cells within 5-6 weeks.
- The rate of replacement was similar whether or not the peritoneum was reconstituted with additional peritoneal cells.
Conclusions:
- Resident peritoneal macrophages are derived from bone marrow precursors.
- These macrophages are regularly replenished from the hematopoietic system, not through self-renewal in situ.