From The Jackson Laboratory, Bar Harbor, ME; Blood Research Institute, The Blood Center of Southeastern Wisconsin, Milwaukee, WI; and Departments of Pediatrics and Biostatistics, Medical College of Wisconsin, Milwaukee, WI.
Mice with disruptions of the red blood cell (RBC) cytoskeleton provide severe hemolytic anemia models in which to study multiorgan thrombosis and infarction. The incidence of cerebral infarction ranges from 70% to 100% in mice with 
-spectrin deficiency. To determine whether mutant RBCs abnormally bind adhesive vascular components, we measured adhesion of mouse and human RBCs to immobilized human thrombospondin (TSP) and laminin (LM) under controlled flow conditions. Mutant RBCs had at least 10-fold higher adhesion to TSP compared with normal RBCs (P < .006). Mutant relative to unaffected RBC adhesion to LM was significantly (P < .01) increased as well. Treatment of RBCs with the anionic polysaccharide dextran sulfate inhibited mutant RBC adhesion to TSP (P < .001). Treatment of RBCs with antibodies to CD47 or the CD47-binding TSP peptide 4N1K-spectrin–deficient sph/sph mice become histologically evident beginning at 6 weeks of age. TSP adhesion of RBCs from 3- to 4- and 6- to 8-week-old sph/sph mice was significantly higher than RBCs from adult mice (> 12 weeks old; P < .005). While the mechanism of infarction in these mice is unknown, we speculate that changes in RBC adhesive characteristics contribute to this pathology.
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