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Differentiation-associated alteration in human monocyte-macrophage accessory cell function.
Journal of Immunology (Baltimore, Md. : 1950)
|May 1, 1983
Summary
Human monocytes (Mo) differentiate into macrophages (Mx) with changing accessory cell (AC) functions. Early-stage macrophages retain AC function, but mature macrophages and pulmonary macrophages show significantly reduced capacity to support T cell proliferation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Human monocytes (Mo) differentiate into macrophages (Mx), undergoing significant changes in function.
- The accessory cell (AC) function of blood monocytes and differentiated macrophages has not been extensively compared.
- Understanding these functional changes is crucial for immunology and cell biology research.
Purpose of the Study:
- To investigate the kinetics and mechanisms of accessory cell (AC) function changes during in vitro human monocyte (Mo) to macrophage (Mx) differentiation.
- To compare the AC function of blood Mo, in vitro derived Mx at different differentiation stages, and pulmonary macrophages (PMx).
Main Methods:
- Monocytes (Mo) were cultured in vitro for 1 to 6 days to differentiate into macrophages (Mx).
- Accessory cell (AC) function was assessed by culturing Mo or Mx with autologous T cells stimulated by Concanavalin A (Con A) or streptokinase-streptodornase (SKSD).
- Mechanisms of AC function loss were explored through antigen expression, mixing experiments, and the impact of dexamethasone.
Main Results:
- Blood monocytes (Mo) effectively supported T cell proliferation, with >90% inhibition upon Mo removal.
- Macrophages (Mx) derived from 1-3 days of culture retained or improved AC function compared to Mo.
- Macrophages (Mx) from 6-day cultures and pulmonary macrophages (PMx) exhibited significantly reduced AC function (<15% of Mo capacity), particularly for SKSD-stimulated T cells.
Conclusions:
- Human culture-derived macrophages (Mx) and pulmonary macrophages (PMx) exhibit a deficit in accessory cell (AC) function.
- This loss of AC function appears to be due to an undefined mechanism, potentially involving impaired antigen processing or presentation, rather than T cell suppression or loss of non-specific signaling.
- Inhibition of differentiation by dexamethasone preserved AC activity, suggesting differentiation itself is key to functional loss.