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c-Cbl and Cbl-b regulate T cell responsiveness by promoting ligand-induced TCR down-modulation

Nature Immunologyvolume 3pages11921199 (2002) | Download Citation

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Abstract

How Cbl family proteins regulate T cell responses is unclear. We found that c-Cbl Cbl-b double knock-out (dKO) T cells became hyperresponsive upon anti-CD3 stimulation, even though the major T cell antigen receptor (TCR) signaling pathways were not enhanced. The dKO T cells did not down-modulate surface TCR after ligand engagement, which resulted in sustained TCR signaling. However, these cells showed normal ligand-independent TCR internalization, and trafficking of internalized TCR to the lysosome compartment after ligand engagement was reduced. These findings show that Cbl family proteins negatively regulate T cell activation by promoting clearance of engaged TCR from the cell surface, a process that is apparently essential for the termination of TCR signals.

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Acknowledgements

We thank R. N. Germain, W. E. Paul, S. K. Pierce, D. R. Littman and Y. R. Zou for critical review of the manuscript; T. Jin, J. Delon and O. Schwartz for assistance on confocal microscopy analysis; J. Takeda and C. Wilson for Lck-Cre transgenic mice. A. Weiss for anti-CD148; F. Huetz for anti-dsDNA reagents; and L. X. Zheng for 2C11. D. H. is supported by Federal funds from the NCI, NIH, under contract N01-C0-56000.

Author information

Author notes

    • Mayumi Naramura

    Present address: Department of Immunology, Cleveland Clinic Foundation, NB-30, 9500 Euclid Avenue, Cleveland, OH, 44195, USA

  1. Mayumi Naramura, Ihn-Kyung Jang and Hemanta Kole: These authors contributed equally to this work.

Affiliations

  1. Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, 20852, MD, USA

    • Mayumi Naramura
    • , Ihn-Kyung Jang
    • , Hemanta Kole
    • , Fang Huang
    •  & Hua Gu
  2. Pathology/Histotechnology Laboratory, National Cancer Institute-Frederick Cancer Research & Development Center, Frederick, 21702, MD, USA

    • Diana Haines

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Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Hua Gu.

Supplementary information

  1. Web Fig 1.

    Pathology of the arteritis in the dKO mice. H&E stain of aorta in WT control (a) and dKO (b) mice. Immunohistochemistry of the dKO specimen with anti-B220 (c) and anti-CD3 (d) shows the infiltration of T but not B cells in the vascular wall. (PDF 351 kb)

  2. Web Fig 2.

    Block of TCR downmodulation on the c-Cbl–deficient CD4+ CD8+ DP thymocytes. Shown are the histograms of TCR expression on gated CD4+ CD8+ DP thymocytes from the WT and c-Cbl–deficient mice. Cells were stimulated with anti-CD3 for 4 h, and cell surface TCRs were revealed by anti-TCRβ staining. Open and shaded curves represent stimulated and nonstimulated cells, respectively. (PDF 46 kb)

  3. Web Fig 3.

    Defective ligand-dependent intracellular TCR retention in dKO T cells. Intracellular retention of internalized TCR was detected as described in Methods. Open and shaded curves represent cells before and after the acidic buffer treatment, respectively. (PDF 113 kb)

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https://doi.org/10.1038/ni855

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