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Immunotyping of blasts in human bone marrow
J Oertel1, B Oertel, J Schleicher
1Virchow-Klinikum, Humboldt Universität zu Berlin, Germany.
Insights
This study introduces a method to identify human bone marrow blasts using immunocytochemistry and May-Grünwald-Giemsa staining. This technique allows for simultaneous morphological and immunocytochemical analysis, aiding in the diagnosis of hematological conditions.
Area of Science:
- Hematology
- Immunocytochemistry
- Cell Biology
Background:
- Diagnosing bone marrow conditions is challenging due to difficulties in morphologically identifying immunostained cells.
- Immunocytochemistry offers potential for detailed cell analysis but requires integration with morphology.
Purpose of the Study:
- To develop and validate a method for simultaneous morphological and immunocytochemical analysis of human bone marrow blasts.
- To characterize the immunophenotype of different blast populations in healthy bone marrow.
Main Methods:
- Utilized an indirect immunoperoxidase technique combined with May-Grünwald-Giemsa staining.
- Analyzed bone marrow samples from six healthy donors.
- Investigated the expression of various cell surface markers including CD34, CD38, HLA-DR, c-kit (CD117), CD13, CD45RA, CD36, CD45RO, Thy-1, CD61, CD22, CD3, CD15, and glycophorin A.
Main Results:
- Blasts I were predominantly positive for CD34, CD38, and HLA-DR.
- A significant proportion of Blasts I expressed c-kit (CD117), CD13, CD45RA, CD36, CD45RO, and CD22, indicating myeloid and B-lymphoid progenitor potential.
- Blasts II, III, and proerythroblasts lacked CD34 expression, distinguishing them from Blasts I.
Conclusions:
- Blasts I are morphologically identifiable progenitor cells with high expression of CD34, CD38, and HLA-DR.
- These cells are multipotent, contributing to erythropoiesis, granulocytomonocytopoiesis, megakaryocytopoiesis, and B-cell development.
- Blasts II and proerythroblasts represent early identifiable precursors in granulocytopoiesis and erythropoiesis, respectively.
Abstract:
The diagnostic potential of immunocytochemical investigation of human bone marrow has not been fully realized due to difficulties in morphological identifying of immunostained cells. We used an indirect immunoperoxidase technique after May-Grünwald-Giemsa staining for simultaneous morphological and immunocytochemical analysis of blasts in human bone marrow. Six healthy bone marrow donors were investigated. Most blasts I expressed CD34, CD38 and HLA-DR. Expression of c-kit (CD117) was observed on 42 +/- 9% of blasts I. Granulocytomonocytopoietic character was demonstrated by expression of CD13 (33 +/- 15%) and CD45RA (23 +/- 10%) and erythropoietic character was demonstrated by expression of CD36 (22 +/- 8%) and CD45RO (30 +/- 11%). A very low proportion of blasts I were Thy-1 and CD61 positive; 34 +/- 6% of blasts I expressed CD22, representing B lymphoid committed progenitors. CD3, CD15, and glycophorin A expression was not detected. Blasts II and III and proerythroblasts did not show CD34 positivity. We conclude that blasts I are morphologically identifiable cells with a high percentage of CD34, CD38, and HLA-DR positivity. They are a pool of committed progenitor cells for erythropoiesis, granulocytomonocytopoiesis, megakaryocytopoiesis, and B cell development. Blast II and proerythroblast represent the first morphologically identifiable cells of granulocytopoiesis and erythropoiesis.