Volume 148, Issue 3 pp. 456-465

Role of the interaction between Lu/BCAM and the spectrin-based membrane skeleton in the increased adhesion of hereditary spherocytosis red cells to laminin

Emilie Gauthier

Emilie Gauthier

Inserm, UMR-S 665

Université Paris Diderot-Paris 7

Institut National de la Transfusion Sanguine

E.G. and W. EN equally contributed to this work.

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Wassim El Nemer

Wassim El Nemer

Inserm, UMR-S 665

Université Paris Diderot-Paris 7

Institut National de la Transfusion Sanguine

E.G. and W. EN equally contributed to this work.

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Marie P. Wautier

Marie P. Wautier

Inserm, UMR-S 665

Université Paris Diderot-Paris 7

Institut National de la Transfusion Sanguine

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Olivier Renaud

Olivier Renaud

PFID, Institut Pasteur

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Gil Tchernia

Gil Tchernia

Centre de la Drépanocytose, F-75013, Paris

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Jean Delaunay

Jean Delaunay

INSERM U 779, Faculté de Médecine Paris-Sud, Université Paris-Sud, Le Kremlin-Bicêtre, France

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Caroline Le Van Kim

Caroline Le Van Kim

Inserm, UMR-S 665

Université Paris Diderot-Paris 7

Institut National de la Transfusion Sanguine

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Yves Colin

Yves Colin

Inserm, UMR-S 665

Université Paris Diderot-Paris 7

Institut National de la Transfusion Sanguine

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First published: 11 January 2010
Citations: 24
Yves Colin, Inserm, UMR-S 665, INTS, 6 Rue Alexandre Cabanel, 75015 Paris, France. E-mail: [email protected]

Presented in part in an abstract (Hematology Meeting Reports 2008, vol. 2; no.4) at the Red Cell and Iron Club Conference, 2008, Brugge, Belgium.

Summary

Lu/BCAM, the unique erythroid receptor for laminin 511/521, interacts with the erythrocyte membrane skeleton through spectrin binding. It has been reported that Hereditary Spherocytosis red blood cells (HS RBC) exhibit increased adhesion to laminin. We investigated the role of Lu/BCAM–spectrin interaction in the RBC adhesion properties of 2 splenectomised HS patients characterized by 40% spectrin deficiency. Under physiological flow conditions, HS RBC exhibited an exaggerated adhesion to laminin that was completely abolished by soluble Lu/BCAM. Triton extraction experiments revealed that a greater fraction of Lu/BCAM was unlinked to the membrane skeleton of HS RBC, as compared to normal RBC. Disruption of the spectrin interaction site in Lu/BCAM expressed in the transfected K562 cell line resulted in a weakened interaction to the skeleton and an enhanced interaction to laminin. These results demonstrated that the adhesion of HS RBC to laminin was mediated by Lu/BCAM and that its interaction with the spectrin-based skeleton negatively regulated cell adhesion to laminin. Finally, the results of this study strongly suggest that the reinforced adhesiveness of spectrin-deficient HS RBC to laminin is partly brought about by an impaired interaction between Lu/BCAM and the membrane skeleton.

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