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Signalling mechanisms in PAF-induced intestinal failure
Ingmar Lautenschläger1, Yuk Lung Wong2, Jürgen Sarau3
1Department of Anaesthesiology and Intensive Care Medicine, University Medical Centre Schleswig-Holstein, Campus Kiel, Kiel, Germany. ingmar.lautenschlaeger@uksh.de.
Scientific Reports
|October 19, 2017
Summary
Platelet-activating factor (PAF) causes capillary leakage and gut issues in intensive care. Targeting IP3 receptors or Rho-kinase shows therapeutic promise without negative side effects.
Area of Science:
- Physiology
- Pharmacology
- Intensive Care Medicine
Background:
- Capillary leakage syndrome, vasomotor disturbances, and gut atony are critical issues in intensive care.
- Platelet-activating factor (PAF) is implicated in these conditions, but its signaling mechanisms remain unclear.
- Understanding PAF's role is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the signaling pathways involved in PAF-induced intestinal dysfunction.
- To analyze the roles of calcium, cAMP, myosin light chain kinase, and Rho-kinase in PAF's effects.
- To evaluate potential therapeutic targets for PAF-mediated pathologies.
Main Methods:
- Utilized an isolated perfused rat small intestine model.
- Administered PAF and various inhibitors: calcium deprivation, 2-APB (IP-receptor antagonist), PDE inhibitors, AC activators, ML-7 (MLCK inhibitor), and Y27632 (ROCK inhibitor).
- Assessed PAF-induced vasoconstriction, capillary/mucosal leakage, edema, malabsorption, and atony.
Main Results:
- PAF-induced vasoconstriction and hyperpermeability involve IP3 receptors, extracellular calcium, and Rho-kinase.
- cAMP-elevating treatments reduced hypertension and edema but worsened dysmotility and malabsorption.
- 2-APB and Y27632 improved most PAF-induced malfunctions without adverse effects.
Conclusions:
- PAF-induced intestinal vasoconstriction and hyperpermeability share common signaling pathways.
- Rho-kinase and IP3 receptors are key mediators of PAF's detrimental effects.
- Targeting Rho-kinase or IP3 receptors may offer therapeutic benefits for PAF-related conditions in intensive care.