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2017 ; 13
(2
): 259-265
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Development of a novel strategy to target CD39 antithrombotic activity to the
endothelial-platelet microenvironment in kidney ischemia-reperfusion injury
#MMPMID28343356
Sashindranath M
; Dwyer KM
; Dezfouli S
; Selan C
; Crikis S
; Lu B
; Yuan Y
; Hickey MJ
; Peter K
; Robson SC
; Cowan PJ
; Nandurkar HH
Purinergic Signal
2017[Jun]; 13
(2
): 259-265
PMID28343356
show ga
Kidney ischemia-reperfusion injury (IRI) is common during transplantation. IRI is
characterised by inflammation and thrombosis and associated with acute and
chronic graft dysfunction. P-selectin and its ligand PSGL-1 are cell adhesion
molecules that control leukocyte-endothelial and leukocyte-platelet interactions
under inflammatory conditions. CD39 is the dominant vascular nucleotidase that
facilitates adenosine generation via extracellular ATP/ADP-phosphohydrolysis.
Adenosine signalling is protective in renal IRI, but CD39 catalytic activity is
lost with exposure to oxidant stress. We designed a P-selectin targeted CD39
molecule (rsol.CD39-PSGL-1) consisting of recombinant soluble CD39 that
incorporates 20 residues of PSGL-1 that bind P-selectin. We hypothesised that
rsol.CD39-PSGL-1 would maintain endothelial integrity by focusing the
ectonucleotidase platelet-inhibitory activity and reducing leukocyte adhesion at
the injury site. The rsol.CD39-PSGL-1 displayed ADPase activity and inhibited
platelet aggregation ex vivo, as well as bound with high specificity to soluble
P-selectin and platelet surface P-selectin. Importantly, mice injected with
rsol.CD39-PSGL-1 and subjected to renal IRI showed significantly less kidney
damage both biochemically and histologically, compared to those injected with
solCD39. Furthermore, the equivalent dose of rsol.CD39-PSGL-1 had no effect on
tail template bleeding times. Hence, targeting recombinant CD39 to the injured
vessel wall via PSGL-1 binding resulted in substantial preservation of renal
function and morphology after IRI without toxicity. These studies indicate
potential translational importance to clinical transplantation and nephrology.