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Isolation and characterization of macrophages from rat embryonic muscle culture
Abstract:
We have previously described the wide distribution of resident macrophages in normal rat skeletal muscle. In this study, we investigated the characteristics of the macrophages that occur in rat embryo muscle cultures. We showed that cells of monocyte-macrophage lineage are present in primary muscle cultures of rat embryos (18 days in gestation) and that these cells form morphologically and phenotypically heterogeneous populations, based on their reaction with monoclonal antibodies ED1, ED2, ED3, and OX43. Constitutively Ia+ cells with dendritic appearance were also observed. Furthermore, we established the procedure for isolation of macrophages from the primary muscle cultures. The isolated cells, mostly ED1+, expressed class I and CD4 antigens and bore complement (C3) receptors on their surfaces. The fact that cell of monocyte-macrophage lineage occur in the embryonic muscle suggests that during embryogenesis these cells may enter the developing muscle and give rise to a population of tissue-associated macrophages.
Insights
Macrophages are present in rat embryo muscle cultures, exhibiting diverse characteristics. These findings suggest their role in developing muscle tissue during embryogenesis.
Area of Science:
- Immunology
- Developmental Biology
- Muscle Biology
Background:
- Resident macrophages are widely distributed in normal adult rat skeletal muscle.
- The origin and characteristics of macrophages in developing muscle tissue remain less understood.
Purpose of the Study:
- To investigate the characteristics of macrophages in rat embryo muscle cultures.
- To establish a method for isolating macrophages from embryonic muscle cultures.
Main Methods:
- Primary muscle cultures were established from 18-day gestation rat embryos.
- Cells were analyzed using monoclonal antibodies (ED1, ED2, ED3, OX43) to assess phenotype.
- Immunophenotyping of isolated macrophages included expression of class I, CD4 antigens, and complement (C3) receptors.
Main Results:
- Monocyte-macrophage lineage cells were identified in embryonic muscle cultures.
- These cells displayed heterogeneous morphology and phenotype.
- Isolated macrophages (mostly ED1+) expressed class I and CD4 antigens and C3 receptors.
- Dendritic, constitutively Ia+ cells were also observed.
Conclusions:
- Embryonic muscle cultures contain a heterogeneous population of monocyte-macrophage lineage cells.
- These findings suggest that macrophages may infiltrate developing muscle during embryogenesis.
- This infiltration could lead to the establishment of tissue-associated macrophage populations in skeletal muscle.