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PLOS ONE 2012

The Endocytic Adaptor Eps15 Controls Marginal Zone B Cell Numbers

DOI: 10.1371/journal.pone.0050818

Benedetta Pozzi, Stefania Amodio, Caterina Lucano, Anna Sciullo, Simona Ronzoni, Daniela Castelletti, Thure Adler, Irina Treise, Ingrid Holmberg Betsholtz, Birgit Rathkolb, Dirk H. Busch, Eckhard Wolf, Helmut Fuchs, Valérie Gailus-Durner, Martin Hrabě de Angelis, Christer Betsholtz, Stefano Casola, Pier Paolo Di Fiore, Nina Offenh？user

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Abstract:

Eps15 is an endocytic adaptor protein involved in clathrin and non-clathrin mediated endocytosis. In Caenorhabditis elegans and Drosophila melanogaster lack of Eps15 leads to defects in synaptic vesicle recycling and synapse formation. We generated Eps15-KO mice to investigate its function in mammals. Eps15-KO mice are born at the expected Mendelian ratio and are fertile. Using a large-scale phenotype screen covering more than 300 parameters correlated to human disease, we found that Eps15-KO mice did not show any sign of disease or neural deficits. Instead, altered blood parameters pointed to an immunological defect. By competitive bone marrow transplantation we demonstrated that Eps15-KO hematopoietic precursor cells were more efficient than the WT counterparts in repopulating B220+ bone marrow cells, CD19？ thymocytes and splenic marginal zone (MZ) B cells. Eps15-KO mice showed a 2-fold increase in MZ B cell numbers when compared with controls. Using reverse bone marrow transplantation, we found that Eps15 regulates MZ B cell numbers in a cell autonomous manner. FACS analysis showed that although MZ B cells were increased in Eps15-KO mice, transitional and pre-MZ B cell numbers were unaffected. The increase in MZ B cell numbers in Eps15 KO mice was not dependent on altered BCR signaling or Notch activity. In conclusion, in mammals, the endocytic adaptor protein Eps15 is a regulator of B-cell lymphopoiesis.

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