Anionic polysaccharides

Abstract.

In liver preservation, the substitution of the anion Cl^– by lactobionic acid (LB) prevents reperfusion edema and extends the preservation time for human livers. We studied the effect of compounds that are structurally related to lactobionic acid: anionic polycarbohydrates (sulfated anionic polysaccharide, SAP, and pentosan polysulfate, PPS) on liver function and leukocyte-endothelial cell interaction in isolated perfusion and liver transplant models. Rat livers, cold-stored (24 h) in a Cl^–-containing control solution, became edematous during 1 h of reperfusion. Substitution of Cl^– by either LB, SAP, or PPS decreased reperfusion edema in a Cl^– concentration-dependent fashion. Reperfusion edema was abolished completely after preservation in 100 mM SAP solution or PPS solution. Also hepatic lactic dehydrogenase (LDH) and aspartate aminotransferase (ASAT) release was lowest after preservation in those solutions. After preservation in LB or anionic polycarbohydrate solutions, portal venous resistance was significantly higher than after preservation in Cl^–-containing control solution. Capillary blood flow was 391±83 pl/s and 398±174 pl/s after preservation in SAP solution (SAPs) and PPSs, and 803±117 pl/s and 641±219 pl/s after preservation in LB or Cl^–-containing control solution. The number of leukocytes sticking to the vascular wall was lower (P<0.05) after preservation in SAPs or PPSs (109±31 cells/mm² and 108±60 cells/mm², respectively), when compared with preservation in Cl^–-containing control or LB solutions (429±63 cells/mm² and 277±59 cells/mm²). In rat liver preservation, anionic polysaccharides are antiedematous compounds, with a higher potency than LB and additional antiadhesive properties.