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Modulation of lymphatic spontaneous contractions by EDRF
L B Reeder1, L H Yang, M K Ferguson
1Department of Surgery, University of Chicago, Illinois 60637.
The Journal of Surgical Research
|June 1, 1994
Summary
Endothelium-derived relaxing factor (EDRF) regulates mesenteric lymph vessel contractions. Inhibiting EDRF enhances lymph vessel contractility, crucial for lymph fluid propulsion.
Area of Science:
- Physiology
- Vascular Biology
- Lymphatic System
Background:
- Mesenteric lymph vessels exhibit spontaneous contractions vital for lymph propulsion.
- Endothelium-derived relaxing factor (EDRF) is released by lymph vessels and hypothesized to regulate their contractile activity.
Purpose of the Study:
- To investigate the role of EDRF in regulating mesenteric lymph vessel contractile activity.
- To determine if EDRF influences the frequency, amplitude, and regularity of lymph vessel contractions.
Main Methods:
- Porcine mesenteric lymph vessel rings were studied in vitro.
- Vessels were treated with prostaglandin F2 alpha (PGF2 alpha) to stimulate contractions, NG-monomethyl-L-arginine (L-NMMA) to inhibit EDRF production, or a combination of both.
- Contractile activity was measured and compared to controls.
Main Results:
- Prostaglandin F2 alpha stimulation increased contraction frequency, amplitude, and tension.
- Inhibition of EDRF production with L-NMMA significantly enhanced basal spontaneous contraction frequency and amplitude.
- L-NMMA also increased the uniformity of contractions in both basal and PGF2 alpha-stimulated vessels.
- The effects of L-NMMA were reversed by L-arginine, confirming EDRF involvement.
Conclusions:
- EDRF plays a significant inhibitory role in regulating the contractile activity of mesenteric lymph vessels.
- EDRF inhibition enhances lymph vessel contractility, impacting lymph fluid propulsion.
- Targeting EDRF pathways may offer therapeutic potential for lymphatic disorders.