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Related Experiment Videos

Leukocyte stasis in hepatic sinusoids

B Vollmar1, S Richter, M D Menger

  • 1Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany.

The American Journal of Physiology
|May 1, 1996
PubMed
Summary

Capillary leukostasis, the trapping of white blood cells in liver sinusoids, does not solely cause perfusion failure after ischemia-reperfusion (I/R). While leukostasis increases, most affected sinusoids remain perfused, challenging its role in the "no-reflow" phenomenon.

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Area of Science:

  • Hepatology
  • Microcirculation Research
  • Inflammation and Immunology

Background:

  • Ischemia-reperfusion (I/R) injury is a significant clinical concern, particularly in liver transplantation and surgery.
  • The
  • The precise role of capillary leukostasis in I/R-induced perfusion failure, known as "no-reflow", remains debated.

Purpose of the Study:

  • To investigate the significance of sinusoidal leukostasis in hepatic ischemia-reperfusion (I/R) injury.
  • To determine the relationship between leukocyte trafficking, sinusoidal leukostasis, and nutritive perfusion failure in the liver post-I/R.

Main Methods:

  • Utilized intravital fluorescence microscopy to observe leukocyte behavior in the hepatic microvasculature of rats.
  • Compared leukocyte trafficking and sinusoidal perfusion in rats undergoing hepatic I/R (n=8) versus sham-operated controls (n=8).

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Main Results:

  • Hepatic reperfusion following I/R exhibited increased sinusoidal leukostasis and perfusion failure in individual sinusoids.
  • Despite increased leukostasis, a substantial majority of sinusoids with stagnant leukocytes remained perfused (97% in nonischemic, 73% in postischemic livers).
  • Leukocyte velocity and flux were significantly reduced in sinusoids with leukostasis, indicating flow retardation but not necessarily complete blockage.

Conclusions:

  • Sinusoidal leukostasis retards leukocyte passage, likely by increasing flow resistance.
  • The data suggest that sinusoidal leukostasis alone does not invariably lead to perfusion failure or the "no-reflow" phenomenon after hepatic I/R.