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Hyaluronan flux from cat intestine: changes with lymph flow
R K Reed1, M I Townsley, T C Laurent
1Department of Physiology, University of South Alabama, Mobile 36688.
Insights
Intestinal hyaluronan turnover was studied by increasing fluid flux in isolated ileal segments. Elevated venous pressure mobilized intestinal hyaluronan, indicating its easy mobilization with increased interstitial fluid flux.
Area of Science:
- Gastroenterology
- Physiology
- Biochemistry
Background:
- Hyaluronan (HA) is a key component of the extracellular matrix with roles in tissue hydration and cell signaling.
- Understanding hyaluronan turnover in the intestine is crucial for comprehending its physiological functions and pathological alterations.
Purpose of the Study:
- To investigate the turnover and mobilization of hyaluronan within the intestinal wall.
- To determine the relationship between interstitial fluid flux and intestinal hyaluronan dynamics.
Main Methods:
- Isolated and autoperfused feline ileal segments were utilized.
- Transcapillary and interstitial fluid fluxes were manipulated by increasing venous pressure.
- Lymph and tissue hyaluronan concentrations were measured under varying fluid flux conditions.
Main Results:
- Lymph hyaluronan concentration initially increased with rising lymph flow, peaking at two to three times above control values.
- At higher lymph flows, hyaluronan concentration significantly decreased, falling below control levels.
- Tissue hyaluronan content showed a significant reduction at the end of the experiments.
Conclusions:
- A substantial portion of intestinal hyaluronan is readily mobilized by increased interstitial fluid flux.
- These findings suggest a dynamic role for hyaluronan in intestinal fluid balance and tissue remodeling.
Abstract:
Isolated and autoperfused ileal segments from pentobarbital-anesthetized cats were used to study turnover of hyaluronan in the intestine. A postnodal lymphatic was cannulated, and transcapillary and interstitial fluid fluxes were increased by raising venous pressure. Lymph hyaluronan concentration in control averaged 20.2 +/- 18.8 (SD) micrograms/ml (range 4.6-50) and increased with increasing lymph flow in all experiments to peak at concentrations two to three times above control values (at 15-20 mmHg increase in venous pressure). At higher lymph flows, hyaluronan concentration fell to below 5 micrograms/ml to an average of 21.3 +/- 19.5% of control value at the highest venous pressures used (30-40 mmHg). Tissue hyaluronan content fell from 349 +/- 191 micrograms/g dry wt in control to 148 +/- 78 micrograms/g dry wt (P less than 0.05) at the end of the experiment. In a second group, vasodilators were administered before elevation of venous pressure to prevent redistribution of blood flow between mucosal and muscular layers. The results were similar to those obtained above. In a third experimental group, venous pressure was elevated in one step to 30 mmHg and maintained at this level. Again, hyaluronan concentration initially increased and later fell well below control values. We conclude that a major part of the intestinal hyaluronan is easily mobilized by increased interstitial fluid flux.
