en
Scientific article
Open access
English

Human recombinant erythropoietin protects the striated muscle microcirculation of the dorsal skinfold from postischemic injury in mice

Published inAmerican journal of physiology. Heart and circulatory physiology, vol. 293, no. 1, p. H274-283
Publication date2007
Abstract

Erythropoietin (EPO) has been proposed as a novel cytoprotectant in ischemia-reperfusion (I/R) injury of the brain, heart, and kidney. However, whether EPO exerts its protection by prevention of postischemic microcirculatory deterioration is unknown. We have investigated the effect of EPO on I/R-induced microcirculatory dysfunctions. We used the mouse dorsal skinfold chamber preparation to study nutritive microcirculation and leukocyte-endothelial cell interaction in striated muscle of the dorsal skinfold by in vivo fluorescence microscopy before 3 h of ischemia and during 5 days of reperfusion. Animals were pretreated with EPO (5,000 U/kg body wt) 1 or 24 h before ischemia. Vehicle-treated I/R-injured animals served as controls. Additional animals underwent sham operation only or were pretreated with EPO but not subjected to I/R. I/R significantly (P < 0.05) reduced functional capillary density, increased microvascular permeability, and enhanced venular leukocyte-endothelial cell interaction during early reperfusion. These findings were associated with pronounced (P < 0.05) arteriolar constriction and diminution of blood flow during late reperfusion. Pretreatment with EPO induced EPO receptor and endothelial nitric oxide synthase expression at 6 h of reperfusion (P < 0.05). In parallel, EPO significantly (P < 0.05) reduced capillary perfusion failure and microvascular hyperpermeability during early reperfusion and arteriolar constriction and flow during late reperfusion. EPO pretreatment substantially (P < 0.05) diminished I/R-induced leukocytic inflammation by reducing the number of rolling and firmly adhering leukocytes in postcapillary venules. EPO applied 1 h before ischemia induced angiogenic budding and sprouting at 1 and 3 days of reperfusion and formation of new capillary networks at 5 days of reperfusion. Thus our study demonstrates for the first time that EPO effectively attenuates I/R injury by preserving nutritive perfusion, reducing leukocytic inflammation, and inducing new vessel formation.

Keywords
  • Animals
  • Back
  • Blood Flow Velocity/drug effects
  • Dose-Response Relationship, Drug
  • Erythropoietin/administration & dosage
  • Mice
  • Mice, Inbred C57BL
  • Microcirculation/drug effects/pathology/physiopathology
  • Muscle, Skeletal/blood supply/drug effects/physiopathology
  • Recombinant Proteins
  • Reperfusion Injury/pathology/physiopathology/prevention & control
  • Skin
Citation (ISO format)
CONTALDO, Claudio et al. Human recombinant erythropoietin protects the striated muscle microcirculation of the dorsal skinfold from postischemic injury in mice. In: American journal of physiology. Heart and circulatory physiology, 2007, vol. 293, n° 1, p. H274–283. doi: 10.1152/ajpheart.01031.2006
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0363-6135
547views
523downloads

Technical informations

Creation03/18/2014 2:45:00 PM
First validation03/18/2014 2:45:00 PM
Update time03/14/2023 9:01:55 PM
Status update03/14/2023 9:01:54 PM
Last indexation01/16/2024 9:25:44 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack