Acridine orange fluorescence cytochemistry for detecting lymphocyte immunoreactivity

Area of Science:

• Immunology
• Cell Biology
• Biochemistry

Background:

• Cellular immune responses involve complex signaling pathways.
• Assessing lymphocyte activation and function is crucial in immunology.
• Early detection of immune reactions can improve disease monitoring.

Purpose of the Study:

• To investigate early cellular changes in rat lymphocytes upon immune stimulation.
• To evaluate the utility of acridine orange staining for detecting immune reactions.
• To explore the relationship between dye behavior and cell membrane permeability.

Main Methods:

• In vitro stimulation of rat lymphocytes with mitogens and antigens.
• Acridine orange staining and fluorescence microscopy.
• Fluorimetry analysis of cell supernatants.

Main Results:

• Acridine orange staining revealed changes in lymphocytes within 3 hours of stimulation.
• Increased red fluorescent cytoplasmic organelles (lysosomes) were observed.
• A decreased overall cell uptake of acridine orange dye was detected.
• Microscopy and fluorimetry identified early events in lymphocyte-tumor cell interactions.

Conclusions:

• Acridine orange staining can detect early cellular immune reactions in rats.
• Observed dye behavior suggests dissociated changes in cell membrane permeability.
• This method offers a simple approach for recognizing cellular immune responses.