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Intact megakaryocytes in the venous blood as a marker for thrombopoiesis
Insights
Circulating megakaryocytes in children decrease with age, reflecting normal bone marrow thrombopoietic activity decline. Higher levels in younger children indicate robust platelet production during early life.
Area of Science:
- Hematology
- Pediatric Medicine
- Cell Biology
Background:
- Megakaryocytes are crucial for platelet production (thrombopoiesis).
- Circulating megakaryocytes can serve as indicators of bone marrow activity.
- Understanding megakaryocyte levels in children is important for assessing normal development.
Purpose of the Study:
- To investigate the levels and characteristics of circulating megakaryocytes in children aged 0-15 years.
- To correlate megakaryocyte counts with age and thrombopoietic activity.
- To establish reference values for circulating megakaryocytes in pediatric populations.
Main Methods:
- Investigated 110 children aged 0-15 years.
- Employed the saponin-haemolysis leucoconcentration technique to isolate circulating megakaryocytes from venous blood.
- Quantified total and intact megakaryocyte numbers per ml of blood.
Main Results:
- Average megakaryocyte counts decreased significantly with age, from 17.8/ml in the first year to 5.5/ml after age 6, similar to adults.
- The percentage of intact megakaryocytes declined from ~40% in the first year to <5% after age 10, mirroring adult levels.
- Higher megakaryocyte numbers were observed in children aged 0-6 years compared to 7-15 years.
Conclusions:
- Circulating intact megakaryocyte levels (≥25%) indicate normal bone marrow thrombopoietic activity.
- The decrease in intact megakaryocytes reflects age-related decline in thrombopoiesis in pediatric bone marrow.
- Thrombopoietic activity decline occurs in distinct periods: 1-3, 6-7, and 10-11 years.
Abstract:
A total of 110 children, aged 0-15 years, were investigated for circulating megakaryocytes in cubital venous blood using the saponin-haemolysis leucoconcentration technique. The average number of megakaryocytes decreased from 17.8 per ml blood in the first year of life to 5.5 after the 6th year, which is the same value as in adult humans. The intact thrombocytogenic megakaryocyte value decreases from about 40% in the first year of life to only a few percent (less than 5%) after the 10th year, the same value as in adult humans. There was a significantly higher number of megakaryocytes in children aged 0-6 years than in those aged 7-15 years. We concluded that occurrence of intact megakaryocytes greater than or equal to 25% in the venous blood is a sign of a normal thrombopoietic activity in the bone marrow, and the percentage of intact megakaryocytes in cubital venous blood reflects the decrease in thrombopoiesis in the bone marrow of fingers, hands and forearms during childhood. The decline in thrombopoietic activity is concentrated in three periods: 1-3, 6-7, and 10-11 years. An occurrence of intact megakaryocytes greater than 5% in venous blood draining organs or bone marrow is a sign of some thrombopoietic activity.