Abstract
Sialyl Lewis X (SLe(x)), an E-selectin ligand, was conjugated with carboxymethylpullulan (CMPul) and the disposition characteristics of this conjugate after intravenous administration were investigated using mice with ear edema. The concentration of 3H-labeled SLe(x)-CMPul in the spleen was significantly high. When CMPul was modified with a saccharide unable to bind to E-selectin, this splenic accumulation was not observed. The uptake of radiolabeled SLe(x)-CMPul by the spleen was completely inhibited by a 100-fold molar of cold SLe(x)-CMPul but not by a sialyl N-acetyllactosamine-CMPul conjugate (SLN-CMPul). Microautoradiography analyses revealed that SLe(x)-CMPul accumulated in the marginal zone of the spleen.
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