Abstract
Leukocyte alkaline phosphatase (LAP) is an enzyme expressed on the external aspect of the neutrophilic granulocyte plasma membrane, and it represents a specific marker for the fully differentiated granulocyte. In this report, we characterize 1B12.1, a monoclonal antibody raised against human bone alkaline phosphatase, for its ability to recognize the LAP protein. With this antibody, we developed a quantitative flow cytometry-based method for the determination of LAP. Double fluorescence flow cytometry demonstrates that the LAP protein is present in relatively high amounts in the neutrophilic granulocytes, but not in monocytes, natural killer cells, B- and T-lymphocytes of normal individuals. The protein is absent in granulocytes obtained from Chronic Myeloid Leukemia and Paroxysmal Nocturnal Hemoglobinuria patients. Higher than normal levels of LAP protein are evident in neutrophilic granulocytes of patients suffering from Polycythemia Vera, Essential Thrombocytemia and Severe Aplastic Anemia. However, the highest amounts of LAP protein are present in the granulocytes of normal individuals treated with G-CSF for the isolation of peripheral blood stem cells.
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Rambaldi, A. et al. (1998). Flow Cytometry of Leukocyte Alkaline Phosphatase in Human Hematopoietic Cells. In: Hiddemann, W., et al. Acute Leukemias VII. Haematology and Blood Transfusion / Hämatologie und Bluttransfusion, vol 39. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71960-8_8
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DOI: https://doi.org/10.1007/978-3-642-71960-8_8
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