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International Immunology, Vol. 15, No. 2, pp. 167-175, February 2003
© 2003 Japanese Society for Immunology

CD80 and CD86 C domains play an important role in receptor binding and co-stimulatory properties

Chenthamarakshan Vasu1, Amy Wang1, Seema R. Gorla1, Shashi Kaithamana2, Bellur S. Prabhakar2 and Mark J. Holterman1

Departments of 1 Surgery, and 2 Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL 60612, USA

Correspondence to: M. J. Holterman; E-mail: rmasjet{at}uic.edu
Transmitting editor: W. M. Yokoyama

CD80 and CD86 expressed on the surface of antigen-presenting cells interact with cytotoxic T lymphocyte antigen-4 [CTLA-4 (CD152)] expressed on activated T cells and mediate critical T cell inhibitory signals. CD80 and CD86 are type I glycoproteins, and are made up of two extracellular (EC) Ig-like domains—a transmembrane region and a cytoplasmic tail. The N-terminal (V domain) and membrane-proximal (C) domains share homology with the variable region (V) and the constant region (C) of Ig respectively. Co-crystallographic structures of both CD80 and CD86 bound to CTLA-4 indicate that there is no direct interaction of the C domain of either CD80 or CD86 with the CTLA-4. In contrast, previous mutagenesis studies have identified specific amino acids within the C domain of CD80 that are critical for CTLA-4 binding. To further understand the importance of C domains in the functioning of CD80 and CD86, we constructed chimeric human CD80 and CD86 molecules by swapping their respective C domains, and tested their ability to stimulate T cells. A Chinese hamster ovary (CHO) cell line expressing CD86 activated murine T cells. In contrast, CHO cells expressing either CD80 or a chimeric construct of the CD86 V domain and the CD80 C domain showed a significantly reduced activation. Our studies further demonstrated that the decreased activation by cells expressing the CD80 or a chimera containing CD80 C domain is most likely due to enhanced CTLA-4 binding. From these results we conclude that C domains play a critical, albeit indirect, role in determining CTLA-4 binding affinities and co-stimulatory properties.

Keywords: cellular activation, co-stimulation, T lymphocyte


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