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[Morpho-functional characteristics of normal and pathological human megakaryocytes studied by selective silver
Abstract:
The activity of nucleolar organizer (NO) in megakaryocytes (MG) from 8 donors, 10 patients with immune thrombocytopenias (IT), 17 patients with chronic myelocytic leukemia (CML) and 14 patients with multiple myeloma (MM) was studied by silver staining. The average number of nucleoli in MG of normal donors comprised 21.8 per nucleus with a range from 16.6 to 33.7. It was significantly lower in MG of CML patients, and, on the contrary, it was higher in MG of IT patients. The average number of Ag grains per nucleus reflecting their activity in relation to ribosomal RNA synthesis was found to be the highest (127 +/- 32.1) in MG of IT patients but rather low (43.2 +/- 7.2) in CML patients as compared to those of the control (76.5 +/- 11.1) and MM patients (86.0 +/- 5.6). The differences in the functional state of MG in varying diseases as well as possibilities of using this new approach in hematology have been discussed.
Insights
Nucleolar organizer (NO) activity in megakaryocytes (MG) differs across blood disorders. Immune thrombocytopenias (IT) show higher NO activity, while chronic myelocytic leukemia (CML) shows lower activity in MG.
Area of Science:
- Hematology
- Cell Biology
- Molecular Biology
Background:
- Megakaryocytes (MG) are crucial for platelet production.
- Nucleolar organizer (NO) activity reflects ribosomal RNA synthesis and cellular function.
- Assessing NO activity in MG may offer insights into hematological disorders.
Purpose of the Study:
- To investigate the activity of nucleolar organizers (NO) in megakaryocytes (MG) from patients with immune thrombocytopenias (IT), chronic myelocytic leukemia (CML), and multiple myeloma (MM).
- To compare NO activity in MG across these hematological conditions and healthy donors.
- To explore the potential of silver staining for assessing MG functional states in hematology.
Main Methods:
- Silver staining technique was employed to study nucleolar organizer (NO) activity.
- Quantification of the average number of nucleoli per nucleus in MG.
- Measurement of the average number of silver grains per nucleus, indicating ribosomal RNA synthesis activity.
Main Results:
- Normal donor MG exhibited an average of 21.8 nucleoli per nucleus.
- MG from immune thrombocytopenias (IT) patients showed significantly higher nucleoli counts and the highest silver grain density (127 +/- 32.1), indicating heightened ribosomal RNA synthesis.
- MG from chronic myelocytic leukemia (CML) patients displayed significantly lower nucleoli counts and low silver grain density (43.2 +/- 7.2), suggesting reduced ribosomal RNA synthesis compared to controls (76.5 +/- 11.1) and multiple myeloma (MM) patients (86.0 +/- 5.6).
Conclusions:
- Nucleolar organizer (NO) activity in megakaryocytes (MG) varies significantly across different hematological conditions.
- Elevated NO activity in MG is associated with immune thrombocytopenias (IT), while decreased activity is linked to chronic myelocytic leukemia (CML).
- Silver staining of NO in MG presents a promising new approach for evaluating the functional status of megakaryocytes in hematological diagnostics.