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Pretreatment of plastic Petri dishes with fetal calf serum. A simple method for macrophage isolation
Abstract:
We have developed a simple method which can recover the highly purified macrophages or monocytes in suspension from mouse peritoneal exudate cells and human perpheral blood mononuclear cells. Plastic Petri dishes coated overnight with heat-inactivated fetal calf serum (FCS) selectively bind macrophages and monocytes. The adherent macrophages and monocytes are easily removed by incubation in phosphate-buffered saline containing 0.2% ethylenediamine tetraacetate (EDTA) and 5% FCS, and recovered as a cell suspension with greater than 95% purity. A small number of isolated cells can restore the mitogenic response to phytohemagglutinin (PHA-P) of macrophages-depleted lymphocytes and can lyse 51Cr-labeled target cells in an antibody-dependent cell-mediated cytotoxicity system. Thus, the method should be valuable for studies of various functions of macrophages and monocytes from different immune tissues of man and animals.
Insights
A new method uses fetal calf serum (FCS)-coated dishes to isolate highly purified macrophages and monocytes from mouse and human cells. This technique yields >95% pure cells, valuable for immune function studies.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Macrophages and monocytes are crucial immune cells involved in various physiological and pathological processes.
- Efficient isolation of pure macrophages and monocytes is essential for studying their specific functions.
- Existing methods for cell isolation can be complex or yield lower purity.
Purpose of the Study:
- To develop a simple and effective method for isolating highly purified macrophages and monocytes.
- To demonstrate the utility of isolated cells in functional immunological assays.
Main Methods:
- Plastic Petri dishes were coated with heat-inactivated fetal calf serum (FCS).
- Macrophages and monocytes from mouse peritoneal exudate cells and human peripheral blood mononuclear cells selectively adhered to the coated dishes.
- Adherent cells were detached using phosphate-buffered saline (PBS) with ethylenediamine tetraacetate (EDTA) and FCS.
Main Results:
- The method achieved high purity (>95%) of macrophages and monocytes.
- Isolated cells restored mitogenic responses in lymphocyte assays.
- The purified cells demonstrated cytotoxic activity in antibody-dependent cell-mediated cytotoxicity (ADCC) assays.
Conclusions:
- This simple FCS-based method provides a reliable way to obtain highly purified macrophages and monocytes.
- The isolated cells are functional and suitable for various immunological research applications.
- This technique is valuable for studying immune cell functions in both animal models and human samples.