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Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
Published on: April 29, 2015
The macrophage heterogeneity: difference between mouse peritoneal exudate and splenic F4/80+ macrophages
Guangwei Liu1, Xue-Pei Xia, Shou-Liang Gong
1Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Abstract:
Macrophages isolated from various tissues manifest differences in cell shape, the expression of surface markers, as well as metabolic and functional activities. However, the heterogeneity of macrophages expressing the same marker in different tissues has not been fully addressed. In the present study, mouse F4/80+ peritoneal exudate macrophages (PEMs) and splenic macrophages (SPMs) appeared similar in most respects. But the percentages of cells expressing CD80, CD40, MHC-II, TLR2, or TLR4, but not CD11c, CD54, or CD23, in freshly isolated F4/80+ SPMs were significantly higher than those in PEMs, whereas the levels of CD86+ cells in F4/80+ SPMs were markedly lower than those in PEMs. After lipopolysaccharide (LPS) stimulation, F4/80+ SPMs expressed significantly higher levels of CD86, CD40, or MHC-II than F4/80+ PEMs, but not CD11c, CD80, CD54, or CD23. F4/80+ SPMs had remarkably lower non-opsonic phagocytotic capacity against chicken RBCs or allo-T cells than PEMs as determined by two-photon microscopes and flow cytometry. SPMs produced markedly more NO than PEMs when cultured with LPS or allo-T cells. Furthermore, SPMs exhibited stronger immunogenicity than PEMs, as determined by the ability to stimulate T cell proliferation, delayed type hypersensitivity, and IFN-gamma production. The data showed the differences between SPMs and PEMs with regard to the phenotypes, phagocytosis, and immunogenicity, which may offer important information for us to better understand the distinguished immune responses of macrophages in spleens and the peritoneal cavity.
Insights
Splenic macrophages (SPMs) and peritoneal exudate macrophages (PEMs) differ in surface markers, phagocytosis, and immune response. SPMs show higher expression of certain markers and greater immunogenicity, while PEMs exhibit superior phagocytic capacity.
Area of Science:
- Immunology
- Cell Biology
- Macrophage Biology
Background:
- Macrophages exhibit tissue-specific heterogeneity in phenotype and function.
- Understanding macrophage diversity is crucial for comprehending distinct immune responses.
- The heterogeneity of macrophages expressing common markers across different tissues requires further investigation.
Purpose of the Study:
- To compare the phenotypic, functional, and immunogenic differences between mouse splenic macrophages (SPMs) and peritoneal exudate macrophages (PEMs).
- To elucidate the distinct immune roles of macrophages residing in the spleen versus the peritoneal cavity.
Main Methods:
- Isolation and characterization of F4/80+ peritoneal exudate macrophages (PEMs) and splenic macrophages (SPMs).
- Flow cytometry analysis of surface marker expression (CD80, CD40, MHC-II, TLR2, TLR4, CD11c, CD54, CD23, CD86).
- Assessment of phagocytic capacity using two-photon microscopy and flow cytometry.
- Measurement of nitric oxide (NO) production.
- Evaluation of immunogenicity through T cell proliferation assays, delayed-type hypersensitivity, and IFN-gamma production.
Main Results:
- SPMs displayed higher percentages of CD80, CD40, MHC-II, TLR2, and TLR4, but lower CD86 expression compared to PEMs.
- Following lipopolysaccharide (LPS) stimulation, SPMs showed higher CD86, CD40, and MHC-II levels than PEMs.
- SPMs exhibited significantly lower non-opsonic phagocytic capacity against chicken red blood cells and allogeneic T cells.
- SPMs produced more nitric oxide (NO) than PEMs upon stimulation with LPS or allogeneic T cells.
- SPMs demonstrated stronger immunogenicity, promoting greater T cell proliferation, delayed-type hypersensitivity, and IFN-gamma production.
Conclusions:
- Significant phenotypic, functional, and immunogenic differences exist between splenic and peritoneal macrophages.
- SPMs are more potent antigen-presenting cells with higher immunogenicity, while PEMs possess superior phagocytic capabilities.
- These findings provide critical insights into the specialized immune functions of macrophages in different anatomical locations.
