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Cellular cytotoxic function and potential in acute myelogenous leukaemia.
S H Lim1, C P Worman, A P Jewell
1Department of Haematology, University College Hospital, London.
Leukemia Research
|January 1, 1991
Summary
Adult acute myeloid leukemia (AML) patients exhibit increased cytotoxic potential but impaired cytotoxic function. This paradox in AML patients is likely due to immunosuppressive serum factors from leukemia myeloblasts.
Area of Science:
- Immunology
- Hematology
- Oncology
Background:
- Acute myeloid leukemia (AML) is a hematologic malignancy characterized by uncontrolled proliferation of myeloid blasts.
- Cellular cytotoxicity plays a crucial role in immune surveillance and cancer control.
- Understanding cytotoxic potential and function in AML patients is vital for assessing immune status and therapeutic strategies.
Purpose of the Study:
- To investigate the cellular cytotoxic potential and function in adult patients with acute myeloid leukemia (AML).
- To analyze cytotoxic activity in AML patients with active disease versus those in complete remission.
- To explore the underlying mechanisms behind any observed paradox in cytotoxic activity.
Main Methods:
- Investigated 27 adult AML patients (13 active disease, 14 complete remission).
- Assessed the percentage of CD3+ lymphocytes expressing cytoplasmic serine esterase as an indicator of cytotoxic potential.
- Analyzed natural killer (NK) cell activity and lectin-dependent cellular cytotoxicity (LDCC) to evaluate cytotoxic function.
Main Results:
- All AML patients, regardless of disease status (active or remission), showed an increased percentage of CD3+ lymphocytes expressing cytotoxicity-linked serine esterase.
- Despite increased cytotoxic potential, all AML patients exhibited impaired target cell lytic activity in both NK and LDCC assays.
- A discrepancy between elevated cytotoxic potential and reduced cytotoxic function was observed in AML patients.
Conclusions:
- AML patients possess a higher than normal cytotoxic potential, indicated by increased serine esterase expression in lymphocytes.
- The cytotoxic function, however, is significantly impaired in AML patients, suggesting a functional deficit.
- This cytotoxicity paradox is hypothesized to result from an immunosuppressive serum factor produced by leukemia myeloblasts, hindering effective anti-leukemia immunity.