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Phagocyte C3-mediated attachment and internalization: flow cytometric studies using a fluorescence quenching
Blut
|October 1, 1984
Summary
Phagocytes attach and internalize C3-coated zymosan particles via complement C3-mediated mechanisms. Particle attachment is limited, but internalization saturates at 11 particles per phagocyte, depending on C3 concentration.
Area of Science:
- Immunology
- Cell Biology
Background:
- Phagocytosis is a critical cellular process for immune defense and tissue homeostasis.
- Complement C3 plays a key role in opsonization, facilitating phagocyte recognition and uptake of pathogens and particles.
Purpose of the Study:
- To quantify the dynamics of C3-mediated attachment and internalization of zymosan particles by phagocytes.
- To investigate factors influencing C3-mediated phagocytosis, including particle-to-cell ratio and complement concentration.
Main Methods:
- Utilized a flow cytometric (FCM) fluorescence quenching technique with trypan blue.
- Measured the attachment and internalization of fluorescein-isothiocyanate (FITC)-labeled zymosan particles by phagocytes.
Main Results:
- Phagocyte attachment of C3-coated zymosan particles was limited to an average of 2 particles per cell, irrespective of increased particle or complement concentrations.
- Internalization of zymosan particles was dependent on C3 concentration and reached saturation at approximately 11 particles per phagocyte.
Conclusions:
- Phagocyte C3-mediated attachment of zymosan particles is a saturable process with a low binding capacity.
- Internalization capacity for C3-opsonized particles is significantly higher than attachment capacity, highlighting distinct regulatory mechanisms.