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Filtration through damaged and undamaged rabbit thoracic aorta
The American Journal of Physiology
|November 1, 1984
Summary
Endothelial removal increases arterial wall hydraulic conductivity, suggesting the endothelium acts as a significant barrier to fluid filtration. This finding is crucial for understanding arterial wall permeability dynamics.
Area of Science:
- Physiology
- Biophysics
- Vascular Biology
Background:
- Fluid filtration across the arterial wall is a critical physiological process.
- The endothelium's role in regulating vascular permeability is not fully understood.
Purpose of the Study:
- To investigate the influence of luminal pressure and endothelial removal on fluid filtration.
- To quantify the hydraulic conductivity of the intact and deendothelialized arterial wall.
Main Methods:
- Rabbit thoracic aorta segments were excised and pressurized.
- Fluid filtration was measured using a 4% albumin-Tyrode solution at controlled pressures (70 and 180 mmHg).
- Hydraulic conductivity (Lp) was calculated from filtration data.
Main Results:
- Hydraulic conductivity of the intact arterial wall decreased significantly with increasing pressure.
- Endothelial removal resulted in significantly higher hydraulic conductivity at both pressures.
- Calculated endothelial conductivity was substantially lower than that of the deendothelialized wall.
Conclusions:
- The endothelium acts as a significant barrier to fluid filtration in the arterial wall.
- Increased pressure may alter interstitial matrix strain, affecting intact wall conductivity.
- Endothelial removal enhances medial interstitium hydration and porosity.