Abstract:
:MUC1 mucin, primarily known as an epithelial antigen, has been demonstrated to be expressed on activated human T cells. In the present study, we first examined the expression of MUC1 on different subsets of T cells (naive, effector, effector/memory). MUC1 appears to be strongly upregulated on activated CD4(+) T cells in comparison with CD8(+) T cells. The cytoplasmic tail of MUC1 contains both immune tyrosine-based activation and inhibitory motifs; therefore, we investigated whether MUC1 can also act as a costimulatory molecule on human T cells. Nonpurified T-cell cultures from human peripheral blood exhibited enhanced proliferation and an increase in cytokine production when CD3 and MUC1 were cross-linked and coligated. The intracellular mechanism of MUC1-mediated costimulation was determined to be mediated by the calcium-dependent NF-AT pathway. We further demonstrated that the cytoplasmic tail of MUC1 binds to the AP-1 transcription factors c-Fos and c-Jun, with c-Fos binding constitutively and c-Jun binding only after MUC1 stimulation. Their nuclear migration is then facilitated in a CD3-dependent manner. Our findings clearly demonstrate that MUC1 is a novel T-cell costimulatory molecule involved in immune regulation. These studies delineate important mechanisms of T-cell activation and regulation.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Konowalchuk JD,Agrawal Bdoi
10.1016/j.humimm.2012.02.024subject
Has Abstractpub_date
2012-05-01 00:00:00pages
448-55issue
5eissn
0198-8859issn
1879-1166pii
S0198-8859(12)00059-6journal_volume
73pub_type
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