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Do changes in bone marrow pressure contribute to the egress of cell from bone marrow?
Abstract:
Pressure was measured in the femoral medullary cavity of rabbits whose femoral muscles were subjected to electrostimulation. After electrostimulation the pressure in the medullary cavity increased fivefold. In groups of experimental animals the number of reticulocytes leaving the bone marrow and the number of reticulocytes in the peripheral blood were determined and it was observed that electrostimulation was followed by a severalfold rise in the amount of reticulocytes in both the bone marrow and the peripheral blood. The authors found that a great role in the egress of reticulocytes from the bone marrow into the circulation is played by regulation of the pressure in medullary cavity effected by changes in blood flow through the bone marrow.
Insights
Electrostimulation of rabbit femoral muscles significantly increases bone marrow pressure, leading to a surge in reticulocytes entering circulation. This suggests bone marrow pressure regulation is key for reticulocyte release.
Area of Science:
- Physiology
- Hematology
- Biomedical Engineering
Background:
- Bone marrow pressure plays a role in regulating blood cell release.
- Electrostimulation is a technique used to study physiological responses.
- Reticulocytes are immature red blood cells released from the bone marrow.
Purpose of the Study:
- To investigate the effect of electrostimulation on femoral medullary cavity pressure.
- To determine the impact of electrostimulation-induced pressure changes on reticulocyte release into peripheral blood.
Main Methods:
- Measuring pressure within the femoral medullary cavity of rabbits.
- Subjecting rabbit femoral muscles to electrostimulation.
- Quantifying reticulocyte counts in bone marrow and peripheral blood.
Main Results:
- Electrostimulation caused a fivefold increase in femoral medullary cavity pressure.
- A severalfold rise in reticulocyte numbers was observed in both bone marrow and peripheral blood post-electrostimulation.
- Increased medullary pressure correlated with enhanced reticulocyte egress.
Conclusions:
- Electrostimulation significantly elevates bone marrow pressure.
- Regulated medullary cavity pressure, influenced by bone marrow blood flow, is crucial for reticulocyte release into circulation.