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Degree of granulation of atrial cardiocytes: its decrease after aorto-caval fistula in the rat
Basic Research in Cardiology
|September 1, 1979
Insights
Creating an aorto-caval fistula in rats reduced atrial cardiocyte granulation, particularly distal granules. This suggests atrial cells sense blood pressure and flow changes.
Area of Science:
- Cardiovascular Physiology
- Cell Biology
Background:
- Atrial cardiocytes contain granules involved in cellular function.
- The role of atrial cardiocytes in sensing hemodynamic changes is not fully understood.
Purpose of the Study:
- To investigate the effect of an aorto-caval fistula on atrial cardiocyte granulation.
- To explore the hypothesis that atrial cardiocytes are sensitive to local blood pressure and flow variations.
Main Methods:
- Experimental creation of an aorto-caval fistula in a rat model.
- Microscopic analysis of atrial cardiocyte granulation, distinguishing between distal and paranuclear granules.
Main Results:
- A significant decrease in granulation was observed in atrial cardiocytes distal to the nucleus.
- Granules located near the nucleus (paranuclear) showed no significant change in granulation.
- The observed partial degranulation supports the role of atrial cardiocytes in hemodynamic sensing.
Conclusions:
- Atrial cardiocytes exhibit a measurable response to altered hemodynamic conditions.
- Partial degranulation of atrial cardiocytes suggests a role in detecting local changes in blood pressure and flow.
- This finding supports the hypothesis of atrial cardiocyte sensitivity to cardiovascular dynamics.
Abstract:
The experimental creation of an aorto-caval fistula in the rat leads to a decrease of the degree of granulation of atrial cardiocytes. This decrease is significant for granules distal to the nucleus and not for paranuclear granules. This partial degranulation reinforces the hypothesis according to which atrial cardiocytes participate in some sensitivity to local changes in blood pressure and flow.