Abstract
Calcium and calcium-binding proteins play important roles in the signaling cascade leading from the initial engagement of TCRs on T cells to the fully activated state. To undertake a molecular dissection of this cascade, we first isolated a Jurkat T cell line derivative containing the NF-AT promoter element driving transcription of the diphtheria toxin A chain gene (dipA), resulting in rapid cell death. Selecting viable cells that fail to activate NF-AT-dependent transcription, we isolated two independent cell lines possessing defects in capacitative Ca2+ entry. NF-AT-dependent transcription can be restored in these cells by expression of a constitutively active calcineurin, but not by overexpression of the Ca2+ regulatory protein CAML, which can normally replace the Ca2+ signal. The defect in these cell lines probably lies between CAML and calcineurin in the T cell activation cascade.
Original language | English (US) |
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Pages (from-to) | 239-250 |
Number of pages | 12 |
Journal | Immunity |
Volume | 3 |
Issue number | 2 |
DOIs | |
State | Published - Aug 1995 |
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology
- Infectious Diseases