Abstract:
:Mice lacking the tumor suppressor gene p53 spontaneously develop T-cell lymphomas at a high rate, suggesting that in these mice lymphomas arise due to defective apoptosis mechanisms in T cells mediated by p53. However, a role of p53 in regulation of T-cell responses or apoptosis has been poorly defined. TCR-mediated signaling in the absence of CD28 costimulation induces both apoptosis and proliferation of naïve T cells from WT mice. In this report we show that, in response to TCR stimulation, T cells from naïve p53-deficient mice exhibited higher proliferation and drastically reduced apoptosis than WT T cells. CD28 costimulation enhanced the proliferation of TCR-stimulated WT and p53(-/-) T cells, suggesting that p53 uncouples CD28-mediated antiapoptotic and proliferative signals. To evaluate the physiological significance of these findings, we transplanted OVA expressing-EG.7 tumor cells into WT and p53(-/-) mice. Unlike WT mice, p53(-/-) mice exhibited a robust tumor-resistant phenotype and developed cytotoxic T-cell responses against OVA. Collectively, these data support the hypothesis that p53 is an essential factor in negative regulation of T-cell responses and have implication for immunomodulation during treatment of cancers and other inflammatory conditions.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Singh N,Huang L,Qin Hdoi
10.1002/eji.200939736subject
Has Abstractpub_date
2010-02-01 00:00:00pages
559-68issue
2eissn
0014-2980issn
1521-4141journal_volume
40pub_type
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