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Adenosine receptor activation improves microcirculation in experimental intestinal ischemia/reperfusion
Juan Zhou1, Katrin Zimmermann2, Thomas Krieg3
1Department of Anesthesia, Dalhousie University, Halifax, NS, Canada.
Clinical Hemorheology and Microcirculation
|June 4, 2014
Summary
Extracellular adenosine signaling protects against gut ischemia-reperfusion (IR) injury by reducing leukocyte adhesion and improving blood flow. The A(2B) adenosine receptor plays a key role in this protective effect.
Area of Science:
- Gastroenterology
- Physiology
- Pharmacology
Background:
- Gut ischemia-reperfusion (IR) injury impairs intestinal microcirculation, leading to mucosal damage and systemic inflammation.
- Extracellular adenosine signaling is a potential protective mechanism in intestinal IR injury.
Purpose of the Study:
- To investigate the protective role of adenosine receptor (AR) agonist NECA in intestinal IR injury.
- To determine the specific adenosine receptor subtypes involved in the protective effects.
Main Methods:
- Intravital microscopy was used to assess leukocyte-endothelial interactions and capillary perfusion in Lewis rats subjected to intestinal IR.
- Rats were treated with NECA, an A(2B)AR antagonist (MRS1754), or an A(1)AR antagonist (DPCPX).
Main Results:
- Intestinal IR significantly increased leukocyte adhesion and reduced capillary perfusion.
- NECA treatment reduced leukocyte activation and improved capillary perfusion.
- A(2B)AR antagonism reversed NECA's protective effects, while A(1)AR antagonism only partially did so.
Conclusions:
- Adenosine signaling plays a significant role in mitigating intestinal IR injury.
- The A(2B) adenosine receptor is critically involved in the protective effects of NECA against gut IR injury.
