Perforin and Granulysin-Mediated Cytotoxicity in Colorectal Cancer Patients

Area of Science:

• Immunology
• Oncology
• Cell Biology

Background:

• Colorectal cancer (CRC) incidence is rising globally, posing a significant health burden.
• Immune system interactions in tumor response are crucial but not fully understood.
• Granulysin (GNLY), perforin, and granzymes are key cytotoxic molecules in cell-mediated immunity against tumors.

Purpose of the Study:

• To investigate perforin and GNLY-mediated cytotoxicity in peripheral blood of CRC patients.
• To analyze the expression of perforin and GNLY in different lymphocyte subpopulations.
• To correlate immune cell function with CRC progression.

Main Methods:

• Flow cytometry was used to analyze perforin and GNLY expression in peripheral blood mononuclear cells (PBMCs).
• Immunofluorescence staining with monoclonal antibodies against perforin, GNLY, and surface antigens (CD3, CD4, CD8, CD56) was performed.
• Phenotypic analysis of lymphocyte subpopulations and protein expression was conducted.

Main Results:

• Perforin and GNLY expression were significantly lower in CRC patients compared to controls.
• Expression levels diminished with advancing tumor stage (Dukes' classification).
• Reduced perforin and GNLY in NK and NKT cells correlated with impaired tumor cell elimination capacity.

Conclusions:

• Impaired perforin and GNLY-mediated cytotoxicity in CRC patients correlates with disease progression.
• Assessing cytotoxic potential offers insights into immune status and potential therapeutic targets.
• Restoring cytolytic function may improve oncologic outcomes and immune competence.