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Megakaryocyte precursors (promegakaryoblasts and megakaryoblasts) in the normal human bone marrow. An
J Thiele1, S Wagner, D Dienemann
1Institute of Pathology, University of Cologne, Federal Republic of Germany.
Abstract:
On routinely processed trephine biopsies of the normal human bone marrow derived from 15 patients, immunostaining with a monoclonal antibody against platelet glycoprotein IIIa (Y2/51) and morphometric measurements were performed for the determination of megakaryocyte precursor cells. Based on cell sizes and on comparison with (1) specimens stained by the periodic acid-Schiff reaction and (2) smears, the smallest elements clearly identifiable as belonging to the megakaryocyte series were classified as promegakaryoblasts. Promegakaryoblasts had a frequency of 1.7/sq mm and 140/cu mm of bone marrow and constituted about 8% of the total positively stained megakaryocytic elements; they were characterized by a size of 41.5 sq microns, a diameter of 7.7 microns, a high nuclear-cytoplasmic ratio (0.32) and a nearly circular outline of their nuclear and cellular perimeters.
Insights
Researchers identified and characterized human bone marrow promegakaryoblasts using immunostaining. These smallest megakaryocyte precursor cells were quantified and described morphometrically.
Area of Science:
- Hematology
- Cell Biology
Background:
- Megakaryocyte precursor cells are crucial for platelet production.
- Accurate identification and quantification of early megakaryocyte stages are essential for understanding hematopoiesis.
Purpose of the Study:
- To identify and characterize promegakaryoblasts, the smallest identifiable megakaryocyte precursor cells, in normal human bone marrow.
- To determine the frequency and morphometric properties of these cells.
Main Methods:
- Immunostaining of bone marrow trephine biopsies using a monoclonal antibody against platelet glycoprotein IIIa (Y2/51).
- Morphometric measurements and comparison with periodic acid-Schiff stained specimens and bone marrow smears.
- Classification of the smallest megakaryocyte series elements as promegakaryoblasts based on size and morphology.
Main Results:
- Promegakaryoblasts were identified as the smallest megakaryocyte precursors.
- Frequency was determined as 1.7/sq mm and 140/cu mm of bone marrow.
- These cells constituted approximately 8% of total positively stained megakaryocytic elements.
- Characterized by a size of 41.5 sq microns, diameter of 7.7 microns, nuclear-cytoplasmic ratio of 0.32, and near-circular outlines.
Conclusions:
- Promegakaryoblasts are identifiable and quantifiable in normal human bone marrow.
- Morphometric data provides a baseline for identifying these early megakaryocyte precursors.
- This study contributes to the understanding of early megakaryopoiesis and hematopoiesis.