Antibody-dependent cellular cytotoxicity in some lymphoreticular diseases

Area of Science:

• Immunology
• Oncology
• Hematology

Background:

• Antibody-dependent cellular cytotoxicity (ADCC) mediated by K cells plays a role in immune surveillance.
• Malignant lymphoreticular disorders can affect immune cell function.

Purpose of the Study:

• To evaluate K-cell mediated cytotoxicity in patients with malignant lymphoreticular disorders.
• To compare K-cell activity between patient groups and healthy controls.
• To assess the impact of chemotherapy on K-cell function.

Main Methods:

• Measurement of K-cell mediated cytotoxicity against chicken erythrocytes.
• Assessment of specific cytotoxicity and cytotoxic capacity.
• Comparison of results in 113 patients and 230 controls.

Main Results:

• Cytotoxic capacity was generally normal in untreated patients with non-Hodgkin's lymphomas, multiple myeloma, chronic lymphocytic leukemia, Hodgkin's disease, and acute lymphoblastic leukemia.
• Specific cytotoxicity was decreased in lymphoid leukemia patients, potentially due to effector cell dilution.
• Chemotherapy significantly reduced K-cell activity, most notably in multiple myeloma, followed by Hodgkin's disease and non-Hodgkin's lymphomas.

Conclusions:

• K-cell mediated cytotoxicity shows differential alterations in various lymphoreticular disorders.
• Chemotherapy has a pronounced suppressive effect on K-cell activity.
• No evidence of K-cell neoplastic disease was found.