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Changes in cellular dry mass during macrophage development
Abstract:
Measurements of dry mass were made on developing human macrophages in suspension culture using a scanning and integrating microinterferometer. The mean dry mass (+/- SEM) of day 0 monocytes of 19 healthy individuals was 53.6 +/- 2.4 pg. There was a significant increase in cellular dry mass over the period of culture, mean values at 2, 4 and 6 days being 61.1, 79.8 and 110.4 pg, respectively. A comparison of the results with those obtained previously by ultrastructural morphometry inferred that there is a disproportionate increase in the water content of macrophages during development. The technique may have potential for investigating changes in mononuclear phagocytes in clinical states.
Insights
Human macrophages significantly increase dry mass during development in culture. This suggests a disproportionate rise in water content, offering potential for clinical monitoring of mononuclear phagocytes.
Area of Science:
- Cell Biology
- Biophysics
Background:
- Macrophages are crucial immune cells involved in various physiological and pathological processes.
- Understanding cellular changes during macrophage development is essential for comprehending their function.
Purpose of the Study:
- To quantify the dry mass changes in human macrophages during in vitro development.
- To investigate the relationship between dry mass and water content during macrophage differentiation.
Main Methods:
- Utilized a scanning and integrating microinterferometer to measure dry mass of human monocytes and macrophages in suspension culture.
- Cultured monocytes from healthy individuals for up to 6 days.
Main Results:
- The mean dry mass of day 0 monocytes was 53.6 pg.
- A significant increase in cellular dry mass was observed over 6 days of culture, reaching 110.4 pg.
- Inferred a disproportionate increase in water content relative to dry mass during macrophage development.
Conclusions:
- Cellular dry mass increases substantially during human macrophage development in culture.
- The observed changes suggest an increased water content, impacting cell volume and function.
- The microinterferometry technique shows promise for studying mononuclear phagocytes in clinical contexts.