Perfusion of kidneys with unformulated "naked" intercellular adhesion molecule-1 antisense oligodeoxynucleotides prevents ischemic/reperfusion injury

Background We have previously shown that phosphorothioate intercellular adh esion molecule (ICAM)-1 antisense oligodeoxynucleotide (oligo) IP-9125 bloc ks the expression of rat ICARS-1 mRNA in rat L2 cells. A single ex situ per fusion of grafts with unformulated IP-9125, suspended in Euro-Collins solut ion, prolonged the survival of kidney allografts in fats. The present exper iments examined whether perfusion of kidneys with unformulated IP-9125 prev ents ischemic/reperfusion injury Methods. Kidneys were perfused ex situ with 2 mi of Euro-Collins solution w ithout or with IP-9125 and exposed to 30-min cold (4 degrees C storage time ) and 30-min warm (anastomosis time) ischemia, Kidneys were then transplant ed to syngeneic nephrectomized recipients, Results. Within 24 hr after transplantation, the glomerular filtration rate values were reduced by almost 60% to 0.49+/-0.14 ml/min from 1.20+/-0.27 m l/min in normal kidneys (P<0.001). Kidney perfusion with 10 mg of either IP -12140 (0.41+/-0.07 ml/min) or IP-13944 (0.47+/-0.07 ml/min) control oligo was ineffective. In contrast, perfusion with 10 mg of IP-9125 significantly improved kidney function (0.8+/-0.18 ml/min; P<0.005), whereas the lower d oses of 2 mg (0.47+/-0.13 ml/min; NS) or 4 mg (0.54+/-0.01 ml/min; NS) had no significant effect. The glomerular filtration rate results were confirme d by measurements of blood creatinine (CR) levels at 24 hr after grafting: untreated recipients had a twofold higher CR value (0.10+/-0.14 mg/dl) comp ared with normal controls (0.65+/-0.07 mg/dl; P<0,001). Although perfusion with 10 mg of control IP-12140 (0.80+/-0.14 mg/dl) or IP-13944 (0.65+/-0.07 mg/dl) did not affect CR levels, perfusion with 10 mg of TP-9125 (0.45+/-0 .07 mg/dl) lowered CR levels. The Western blots or reverse transcription-po lymerase chain reaction experiments performed in kidney transplants within 24 hr after grafting showed that 10 mg of TP-9125 (but not control IP-12140 ) reduced the expression of ICAM-1 protein and ICAM-1 mRNA, respectively. Conclusions. Perfusion of grafts with unformulated ICAM-1 antisense oligo s pecifically reduces intragraft ICAM-1 protein expression and prevents ische mic/reperfusion injury.