The effects of PGI2 analog (OP-41483) on perfused porcine liver

The effects of prostacyclin analog OP-41483 on normothermic liver ischemia and reperfusion injury in rats

To estimate the effects of the prostacyclin analog (OP-41483) on normothermic liver ischemia and reperfusion injury, saline (Group 1, N = 8), heparin (group 2, N = 8, 100 u/kg) or OP-41483 (group 3, N = 8, 400 ng/kg/min) was infused intravenously for 30 min before and after liver ischemia in rats. There were no significant differences in survival, or transaminase at 30 min after reperfusion among the three groups. Hepatic vessel flow and tissue flow were measured for the first 30 min after reperfusion. Hepatic tissue flow increased for the first 30 min after reperfusion in the group 3 rats, but not in the groups 2 and 3 rats. There were significant differences in hepatic tissue flow between the groups 1 and 3 rats at 20 min (p < 0.05), as well as significant differences between the groups 1 and 3 rats (p < 0.01) and the groups 1 and 2 rats (p < 0.05) at 30 min after reperfusion. There were no significant differences in total hepatic inflow among the three groups. Our data suggest that OP-41483 exerts beneficial effects by improving the microcirculation and increasing the effective hepatic blood flow in the ischemically injured liver after reperfusion.

Conversion of mitochondrial redox state toward oxidation by prostacyclin in 70%-hepatectomized rats

Arterial blood ketone body ratio (KBR) and hepatic mitochondrial phosphorylation rate (PR) were investigated in partially (70%) hepatectomized rats treated with 100 micrograms/kg body weight prostacyclin (PGI2) analogue i.p. after operation and every 12 h thereafter up to 72 h. Sampling was performed at 12, 24, 48, and 72 h after operation. In sham-operated rats, KBR significantly increased from the preoperative values of 0.34 +/- 0.03 and 0.38 +/- 0.03, to 0.55 +/- 0.03 and 0.58 +/- 0.02 at 12 h in the groups with and without PGI2 treatment, respectively (P less than 0.001). KBR returned to the preoperative levels after 24 h in the PGI2-treated group, while it tended to be in the lower normal range in the untreated group. In the hepatectomized rats, KBR significantly decreased in the untreated group compared with the preoperative values and the values in the sham-operated group. It returned to the preoperative range within 72 h. In the PGI2-treated group, KBR increased significantly, to values above 0.54, after a 24-h delay and was maintained at those levels for 72 h. Concentrations of total ketone bodies (TKB) in the untreated groups remained in the upper range of preoperative values (above 200 nmol/ml) in the sham-operated rats and decreased significantly in the hepatectomized group (234 to 126 nmol/ml). TKB in the treated groups tended to decrease only in the sham-operated group (205 to 166 nmol/ml), and was massively reduced in the hepatectomized group (167 to 81 nmol/ml).(ABSTRACT TRUNCATED AT 250 WORDS)

Protective effect of a prostaglandin oligomer on liver mitochondria in situ: time-shared measurements of fluorescence and reflectance in the cold-preserved rat liver

The protective effect of a new oligomeric derivative of prostaglandin B2, known as OC-5186, was evaluated using time-sharing spectrofluorometry in the cold-preserved rat liver. Experiments were divided into three groups: in group A, a 5000 ng dose of OC-5186 was administered via the peripheral vein, 1000 ng via the portal vein, and 200 ng/ml in University of Wisconsin (UW) solution; in group B, the OC-5186 dosage was ten times greater than that in group A; in group C (control group), liver procurement and storage were performed without OC-5186. At 0, 12, and 24 h after cold preservation at 4 degrees C, the liver was perfused for 30 min at 12 degrees C with oxygenized Krebs-Henseleit solution, after which the perfusate was switched to deoxygenized Krebs-Henseleit solution. Time sharing spectrofluorometry was used to follow NADH fluorescence at 450 nm with a 360-nm excitation wavelength, as well as the reflectance of cytochrome aa3 with 605 minus 620 nm from oxidation to reduction. Rate constants of NADH fluorescence and cytochrome aa3 reflectance were used as indices of integrity of the mitochondrial respiratory chain. In group C, the rate constant of NADH fluorescence decreased significantly (P < 0.05) from the control value of 8.31 +/- 0.21 x 10(-3) (sec-1) to 4.97 +/- 0.15 x 10(-3) and 5.58 +/- 0.16 x 10(-3) (mean +/- SEM) at 12 and 24 h after cold preservation, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Seventy-two-hour preservation of porcine liver by continuous hypothermic perfusion with UW solution in comparison with simple cold storage

Porcine livers preserved for 72 hr using continuous hypothermic perfusion (CHP) were studied in order to compare the effects of CHP on energy metabolism with those of simple cold storage (SCS). The livers of the CHP group were perfused in situ for 72 hr at 7 degrees C with University of Wisconsin (UW) solution and FC-43 as an oxygen carrier, while those of the S1 group were stored ex situ for 48 hr at 4 degrees C in UW solution, and those of the S2 group for 72 hr. They were then recirculated with human blood at 37 degrees C for 2 hr for the evaluation of their viability. At the end of preservation, significantly higher levels of total adenine nucleotides (TAN) and energy charge (EC) were observed in the CHP group compared with the S1 and S2 groups. At 2 hr recirculation, the level of TAN was significantly higher in the CHP group than in the S1 and S2 groups. The EC level was also higher in the CHP group than in the S2 group. During recirculation, the ketone body ratio (acetoacetate/beta-hydroxybutyrate) was higher in the CHP group than in the S2 group. The values in the CHP group were above 1.0 after 45 min recirculation. There were no significant differences in the pyruvate/lactate ratio and lactate level between the CHP and S1 groups. However, these values were significantly different from those in the S2 group. The present findings demonstrate that CHP using UW solution and the oxygen carrier was better able to preserve the energy metabolism of the porcine liver for 72 hr than 48-hr SCS in UW solution.