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Chronic lymph flow responses to hyperproteinemia

¹Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505, USA.

The American Journal of Physiology

|August 5, 1998

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Long-term hyperproteinemia in dogs led to reduced lymph flow, protein transport, and permeability-surface area product. This condition also increased lymph protein concentration and colloid osmotic pressure.

Area of Science:

Physiology
Lymphatic System Dynamics
Cardiovascular Research

Background:

Hyperproteinemia, an elevated plasma protein concentration, can impact fluid balance and transport.
Understanding the long-term effects of hyperproteinemia on lymphatic function is crucial for physiological research.

Purpose of the Study:

To investigate the chronic effects of induced hyperproteinemia on lymph flow, lymph protein transport, and the permeability-surface area (PS) product in conscious dogs.
To analyze the alterations in plasma and lymph protein concentrations and colloid osmotic pressures during sustained hyperproteinemia.

Main Methods:

Conscious dogs underwent daily intravenous infusions of autologous plasma for 9 days to induce hyperproteinemia.
Chronic lymphatic cannulation of the afferent lymphatic to the popliteal node was used to measure lymph flow.

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Plasma protein concentration (PPC), lymph protein concentration, plasma colloid osmotic pressure, and lymph colloid osmotic pressure were monitored.

Main Results:

Sustained hyperproteinemia (9 days) resulted in significant decreases in lymph flow (12.3 to 3.8 microl/min), lymph protein transport (241 to 141 microg/min), and the PS product (4.7 to 3.0 microl/min).
Plasma protein concentration increased from 7.1 to 8.8 g/dl, while lymph protein concentration rose from 1.9 to 3.8 g/dl.
Both plasma and lymph colloid osmotic pressures increased significantly, indicating altered fluid dynamics.

Conclusions:

Long-term hyperproteinemia induces chronic reductions in lymph flow, lymph protein transport, and the PS product in dogs.
The observed decrease in lymph flow contributes to elevated lymph protein concentration, while reduced PS product suggests diminished transcapillary protein flux.
These findings highlight the complex adaptations of the lymphatic system to sustained alterations in plasma protein levels.