Abstract
Attractin is a rapidly upregulated membrane-associated molecule on activated T cells. It is a member of the CUB family of extracellular guidance and development proteins, sharing with them a protease activity similar to that of Dipeptidyl peptidase IV (DPPIV/CD26). Most remarkably, and in sharp contrast to CD26, it is released from the T cell and is presumed to be a major source of a soluble serum-circulating attractin. Genomic sequencing reveals that the soluble form is not a proteolytic product of the membrane form, but is in fact the result of alternative splicing. Recent results prove that the loss of murine membrane attractin results in the mahogany mutation with severe repercussions upon skin pigmentation and control of energymetabolism. In each of these latter instances, there is a strong likelihood that attractin is moderating the interaction of cytokines with their respective receptors. We propose that attractin is performing a similar function in the immune system through capture and proteolytic modification of the N-terminals of several cytokines and chemokines. This regulatory activity allows cells to interact and form immunoregulatory clusters and subsequently aids in downregulating chemokine/cytokine activity once a response has been initiated. These two properties are likely to be affected by the balance of membrane-expressed to soluble attractin.
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Duke-Cohan, J.S., Tang, W., Schlossman, S.F. (2002). Attractin: A Cub-Family Protease Involved in T Cell-Monocyte/Macrophage Interactions. In: Langner, J., Ansorge, S. (eds) Cellular Peptidases in Immune Functions and Diseases 2. Advances in Experimental Medicine and Biology, vol 477. Springer, Boston, MA. https://doi.org/10.1007/0-306-46826-3_20
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DOI: https://doi.org/10.1007/0-306-46826-3_20
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