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Related Experiment Videos

Recombinant human granulocyte colony-stimulating factor reverts vascular dysfunction

F Squadrito1, D Altavilla, G Squadrito

  • 1Institute of Pharmacology, School of Medicine, University of Messina, Italy.

International Journal of Microcirculation, Clinical and Experimental
|January 1, 1997
PubMed
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Recombinant human granulocyte colony-stimulating factor (rh G-CSF) improved survival and vascular function in a rat model of splanchnic artery occlusion shock. This G-CSF treatment mitigated hypotension and vascular dysfunction, suggesting a role in low-flow states.

Area of Science:

  • Physiology
  • Pharmacology
  • Immunology

Background:

  • Splanchnic artery occlusion shock is a model of irreversible vascular failure with high mortality.
  • This condition is characterized by profound hypotension and vascular dysfunction, including hyporeactivity to vasoconstrictors.
  • The role of granulocyte colony-stimulating factor (G-CSF) in vascular shock remains underexplored.

Purpose of the Study:

  • To investigate the vascular effects of recombinant human granulocyte colony-stimulating factor (rh G-CSF) in a rat model of splanchnic artery occlusion shock.
  • To determine if rh G-CSF administration can improve survival rates and ameliorate vascular dysfunction in this shock model.
  • To explore the potential mechanisms by which rh G-CSF influences vascular function during low-flow states.

Main Methods:

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  • Male rats underwent 45-minute splanchnic artery occlusion followed by reperfusion.
  • rh G-CSF (20 micrograms/kg i.v.) was administered 5 minutes after reperfusion.
  • Vascular reactivity was assessed using phenylephrine on aortic rings.
  • Survival rates were monitored up to 4 hours post-occlusion.
  • Inducible nitric oxide synthase (iNOS) activity in peritoneal macrophages was measured.

Main Results:

  • rh G-CSF administration significantly increased survival rates to 90% at 4 hours post-occlusion, compared to 0% in controls.
  • rh G-CSF treatment blunted the profound hypotension induced by splanchnic artery occlusion.
  • Vascular dysfunction, evidenced by hyporeactivity to phenylephrine, was reverted by rh G-CSF.
  • rh G-CSF inhibited endotoxin-induced iNOS activity in peritoneal macrophages.

Conclusions:

  • rh G-CSF demonstrates significant protective effects in a rat model of irreversible vascular failure.
  • rh G-CSF improves survival, mitigates hypotension, and restores vascular function during splanchnic artery occlusion shock.
  • The inhibitory effect of rh G-CSF on iNOS activity suggests a potential mechanism for its vascular benefits in low-flow states.