Journal of Leukocyte Biology Myeloid cells, immune suppression, tumor immunology
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Published online before print January 13, 2006
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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.0705425

Received for publication July 30, 2005.
Revised November 28, 2005.
Accepted for publication November 29, 2005.

Article

CD13 in cell adhesion: aminopeptidase N (CD13) mediates homotypic aggregation of monocytic cells

Paola Mina-Osorio *, Linda H. Shapiro {dagger}, and Enrique Ortega *

*Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México D.F.; and {dagger}Department of Cellular Biology, Center for Vascular Biology, University of Connecticut Health Center, Farmington


  Abstract

Homotypic aggregation (HA) of cells plays key roles in physiological and pathological processes, such as embryogenesis, immune responses, angiogenesis, tumor cell invasion, and metastasis. Aminopeptidase N (CD13) has been implicated in most of these phenomena, although its participation has been attributed to its enzymatic activity, and its role as an adhesion molecule has been almost unexplored. Here, we show that certain anti-CD13 monoclonal antibodies induce HA of monocytic U-937 cells, independently of their effect on enzymatic activity. The phenomenon is related to binding to a specific site on the CD13 molecule and is independent of integrins. It is abrogated by low temperature, by the glycolysis inhibitor 2-deoxyglucose, and by inhibitors of tyrosine and mitogen-activated protein kinases. The inhibitor of microtubule polymerization colchicine has a synergistic effect on CD13-mediated aggregation, suggesting an inhibitory role of microtubules in this process. Finally, during HA, CD13 actively redistributes to the zones of cell-cell contact, as determined by live cell imaging studies, demonstrating a direct role of CD13 in the adhesion phenomenon. Together, these data show for the first time the participation of CD13 in monocytic cell adhesion.

Key Words: monocytes • laser scanning confocal microscopy • paraformaldehyde




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P. Mina-Osorio, B. Winnicka, C. O'Conor, C. L. Grant, L. K. Vogel, D. Rodriguez-Pinto, K. V. Holmes, E. Ortega, and L. H. Shapiro
CD13 is a novel mediator of monocytic/endothelial cell adhesion
J. Leukoc. Biol., August 1, 2008; 84(2): 448 - 459.
[Abstract] [Full Text] [PDF]


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