Selectins have been implicated in the pathogenesis of ischemia/reperfusion (I/R)-induced kidney injury and resultant DGF. PSGL-1 is a ligand for P-, E-, and L-selectin. It has been reported that that YSPSL (rPSGL-Ig) blocks P-selectin and, to a lesser degree, E- and L-selectin. Both sPSGL-1 and YSPSL (rPSGL-Ig) have been shown in animal models to reduce both cytokines and tissue damage associated with ischemia reperfusion and to improve renal function post-transplant. Therefore, the current phase I/II clinical study is designed to assess the safety and efficacy of YSPSL (rPSGL-Ig) in preventing DGF in patients undergoing cadaveric kidney transplants and to determine a dose for future pivotal studies.

This will be a multicenter, single-dose, dose-escalation study. The study will be in 2 parts: the first, Part A, will be an open label evaluation of single doses of four dose cohorts and the second, Part B will be a randomized, double-blind, placebo-controlled, single-dose, dose-escalation study of two dose cohorts. Patients who are undergoing cadaveric kidney transplantation and are at risk for development of DGF, based upon known risk factors, will be eligible to participate in the study. A maximum of 24 patients will be enrolled in Part A of the study. 60 patients will be enrolled in Part B.

Inclusion Criteria:

• primary cadaver renal transplants Other inclusion criteria delineated in protocol

Exclusion Criteria:

• Full criteria delineated in protocol Patient has a planned transplant of a donor kidney from a non-heartbeating donor; Patient has a planned transplant of kidneys that are implanted en bloc (dual kidney transplant) or from donors <6 years of age; Patient has a planned transplant of a kidney from a donor who has received investigational therapies designed to reduce the impact of ischemia/reperfusion (I/R) injury, DGF, or other donor-related immune events; Patient is planned to receive a living donor kidney; or Patient is planned to receive an ABO-incompatible donor kidney.