Co-stimulation with 4-1BB ligand allows extended T-cell proliferation, synergizes with CD80 CD86 and can reactivate anergic T cells -- Habib-Agahi et al. 19 (12): 1383 -- International Immunology

All rights reserved. For permissions, please e-mail: journals.permissions oxfordjournals.org Co-stimulation with 4-1BB ligand allows lenghty T-cell proliferation, synergizes with CD80 CD86 and can reactivate anergic T cells Mojtaba Habib-Agahi 1, 2, Thanh T. Phan 1, 3 and Peter F.

Searle 1 1 Cancer Test UK Academy for Cancer Studies, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK 2 Extant address: Branch of Immunology, Academy of Medicine, Shiraz University of Medical Sciences, Shiraz 71345-3119, Iran 3 Manifest address: Department of Cardiovascular Medicine, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK Letter to : P.

Antigen encounter without all-inclusive co-stimulation results in T-cell desensitization or anergy, a mechanism of peripheral tolerance and an obvious encumbrance to cancer immunotherapy. One substantial co-stimulatory way involves CD28 engagement by CD80 or CD86. However, other ligand-receptor pairs can and equip co-stimulation and may gain primary functions modulating the unsusceptible response.

To extremely investigate the doable for cancer immunotherapy, we studied the baggage of CD80 CD86 and 4-1BBL in repeated stimulation of human T cells and asked if 4-1BBL might be capable of reversing anergy.

We expressed CD80, CD86 and 4-1BBL in A549 lung carcinoma cells using adenovirus vectors and co-cultured these with human T cells stimulated with anti-CD3 antibody. Combined co-stimulation with CD80 CD86 and 4-1BBL very allowed non-stop proliferation at a faster scale than either expression alone. Co-stimulation with 4-1BBL did not suppress signal of the inducible, inhibitory CD80 CD86R, CTLA-4.

Significantly, we pageant that T cells that had alter to non-responsive to anti-CD3, either alone or stable with CD80 CD86 co-stimulation, and thus were anergic, could be reactivated to proliferate when costimulated with 4-1BBL, either alone or combined with CD80 CD86. Keywords: anergy, 4-1BB ligand, CD80, co-stimulation, human T cells Transmitting editor : M. Feldmann Received 8 May 2007, regular 28 Sept 2007.

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