Cytochemical "normal" and "abnormal" eosinophils in acute leukemias

Area of Science:

• Hematology
• Cell Biology

Background:

• Eosinophils are key leukocytes involved in various disorders, including acute leukemias.
• Morphological assessment of eosinophils is often insufficient for distinguishing normal from abnormal cells.

Purpose of the Study:

• To identify specific cytochemical criteria for differentiating normal and abnormal eosinophils in acute leukemias.
• To investigate the utility of cytochemistry in evaluating eosinophilic cell abnormalities in leukemic conditions.

Main Methods:

• Defined 'normal' eosinophil cytochemistry based on specific enzyme and staining reactions (peroxidase, esterase, Sudan black, PAS, etc.).
• Analyzed cytochemical profiles of eosinophils in seven acute leukemia cases (two acute myeloblastic, five myelomonocytic).
• Compared cytochemical findings in leukemic eosinophils against established 'normal' criteria.

Main Results:

• Normal eosinophils typically lack alkaline phosphatase, chloroacetate esterase, toluidine blue metachromasia, Astra blue positivity, and specific PAS-positive granules.
• Abnormal eosinophils in acute leukemias demonstrated chloroesterase activity, PAS and Astra blue positivity in specific granules, toluidine blue metachromasia, and variable cyanide-resistant peroxidase activity.
• Significant deviations from normal cytochemical profiles were observed in leukemic eosinophils.

Conclusions:

• Cytochemical analysis provides valuable criteria for identifying abnormal eosinophils in acute leukemias.
• These cytochemical differences can aid in the diagnostic evaluation of eosinophilic abnormalities in leukemia.
• Cytochemistry offers a more objective method than morphology alone for assessing eosinophil status in leukemic patients.