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Comparative and Functional Genomics
Volume 2012, Article ID 368938, 11 pages
Review Article

Structure, Expression, and Function of ICAM-5

1Department of Neurology, The No.5 People’s Hospital of Shangrao, Jiangxi 334000, China
2Ruikang Hospital, Guangxi Traditional Chinese Medical Collage, Guangxi 530011, China

Received 29 May 2011; Revised 20 September 2011; Accepted 7 October 2011

Academic Editor: H. Heng

Copyright © 2012 Heping Yang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cell adhesion is of utmost importance in normal development and cellular functions. ICAM-5 (intercellular adhesion molecule-5, telencephalin, TLN) is a member of the ICAM family of adhesion proteins. As a novel cell adhesion molecule, ICAM-5 shares many structural similarities with the other members of IgSF, especially the ICAM subgroup; however, ICAM-5 has several unique properties compared to the other ICAMs. With its nine extracellular Ig domains, ICAM-5 is the largest member of ICAM subgroup identified so far. Therefore, it is much more complex than the other ICAMs. The expression of ICAM-5 is confined to the telencephalic neurons of the central nervous system whereas all the other ICAM members are expressed mostly by cells in the immune and blood systems. The developmental appearance of ICAM-5 parallels the time of dendritic elongation and branching, and synapse formation in the telencephalon. As a somatodendrite-specific adhesion molecule, ICAM-5 not only participates in immune-nervous system interactions, it could also participate in neuronal activity, Dendrites’ targeting signals, and cognition. It would not be surprising if future investigations reveal more binding partners and other related functions of ICAM-5.