CD107a Degranulation Assay to Evaluate Immune Cell Antitumor Activity

Area of Science:

• Immunology
• Cancer Biology
• Cellular Biology

Background:

• The immune system actively surveils developing tumors.
• Cytotoxic lymphocytes, including CD8+ T cells and natural killer (NK) cells, eliminate tumor cells via secreted lytic granules.
• Degranulation involves granule-membrane fusion with the cell surface, exposing proteins like CD107a.

Purpose of the Study:

• To outline a method for assessing cytotoxic immune function.
• To establish CD107a surface expression as a reliable marker for immune cell activation and degranulation.
• To provide a protocol for evaluating NK cell cytotoxic activity against tumor cell lines.

Main Methods:

• Isolation of peripheral blood mononuclear cells (PBMCs).
• Co-culture of PBMCs with target tumor cell lines.
• Flow cytometry analysis to quantify CD107a surface expression on NK cells.

Main Results:

• CD107a membrane expression serves as a direct indicator of cytotoxic degranulation.
• The described method allows for the evaluation of immune cell activation.
• Quantifiable assessment of cytotoxic immune function against tumor targets is achievable.

Conclusions:

• CD107a surface expression is a validated marker for cytotoxic lymphocyte activation.
• This methodology facilitates the study of anti-tumor immune responses.
• The protocol enables robust measurement of immune cell degranulation and cytotoxic potential.