Document Detail


Acadesine and intestinal barrier function after hemorrhagic shock and resuscitation.
MedLine Citation:
PMID:  11153629     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To determine actions of the prototype adenosine-regulating agent, acadesine (5-amino-1-[beta-D-ribofuranosyl]imidazole-4-carboxamideriboside; AICAR), on intestinal barrier function after hemorrhagic shock and fluid resuscitation, three series of experiments were performed to measure functional (series 1: intestinal permeability and intramural blood flow), structural (series 2: histology), and biochemical (series 3: tissue concentrations of adenine nucleotides and metabolites) changes. DESIGN: Prospective, controlled animal study. SETTING/SUBJECTS: University laboratory; juvenile crossbred pigs of either gender. INTERVENTIONS: Either AICAR or its saline vehicle were intravenously administered 30 mins before 40% hemorrhage. After 1 hr shock, shed blood plus crystalloid was administered for resuscitation. Data were collected for 1 hr thereafter. MEASUREMENTS AND MAIN RESULTS: In series 1, permeability of the ileum was measured by assaying the portal venous concentration of fluorescein-labeled dextran after placement of this tracer in the lumen. In addition, serosal and mucosal blood flow were monitored with laser-Doppler probes. With vehicle, hemorrhage and resuscitation increased the dextran concentration three-fold and decreased blood flow 50% of the baseline values (both p < .05). AICAR attenuated the permeability increase (p < .05) and attenuated mucosa, but not serosal, ischemia (p < .05). Similar effects were observed with a structurally dissimilar compound-- 4-amino-1-(5-amino-5-deoxy-1-beta-D-ribofuranosyl)-3-bromo-pyrazolo [3,4-d] pyrimidine, a specific adenosine kinase inhibitor-as well as continuous intra-arterial infusion of adenosine. In series 2, AICAR ameliorated the mucosal damage caused by shock/resuscitation (p < .05). In series 3, AICAR increased ileal tissue adenine nucleotides and metabolites during the shock period (p < .05). CONCLUSIONS: AICAR attenuated gut permeability changes, increased mucosal perfusion, and increased tissue adenine nucleotides, which is consistent with preserved intestinal barrier function after hemorrhage and fluid resuscitation. In context with previous studies from this laboratory, these results provide further evidence for a role for adenosine as an endogenous anti-inflammatory autacoid after shock and trauma. Further study is needed to determine the therapeutic potential of adenosine-regulating agents in resuscitation fluids.
Authors:
D N Ragsdale; K G Proctor
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Critical care medicine     Volume:  28     ISSN:  0090-3493     ISO Abbreviation:  Crit. Care Med.     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2001-01-10     Completed Date:  2001-01-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0355501     Medline TA:  Crit Care Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3876-84     Citation Subset:  AIM; IM    
Affiliation:
Department of Physiology, University of Tennessee, Memphis, USA.
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MeSH Terms
Descriptor/Qualifier:
Adenosine / pharmacology,  physiology,  therapeutic use
Adenosine Kinase / antagonists & inhibitors
Aminoimidazole Carboxamide / analogs & derivatives,  pharmacology,  therapeutic use*
Animals
Blood Flow Velocity
Capillary Permeability / drug effects,  physiology*
Disease Models, Animal
Drug Evaluation, Preclinical
Female
Fluid Therapy*
Formycins / pharmacology,  therapeutic use
Ileum*
Intestinal Mucosa / blood supply*,  drug effects,  physiology*
Ischemia / etiology*,  metabolism*
Laser-Doppler Flowmetry
Male
Resuscitation*
Ribonucleosides / pharmacology,  physiology*,  therapeutic use*
Shock, Hemorrhagic / complications,  metabolism*,  physiopathology,  therapy*
Swine
Chemical
Reg. No./Substance:
0/Formycins; 0/GP 515; 0/Ribonucleosides; 2627-69-2/acadesine; 360-97-4/Aminoimidazole Carboxamide; 58-61-7/Adenosine; EC 2.7.1.20/Adenosine Kinase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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