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Division of Basic Sciences, Laboratory of Experimental Immunology, National Cancer Institute, and
Intramural Research Support Program, Science Applications International Corp. Frederick, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, MD 21702
The pore-forming protein perforin is preferentially expressed in NK
and cytotoxic T cells. To investigate the molecular regulation of human
perforin gene transcription, the activity of the human perforin
promoter was analyzed in human NK and T cell lines using various
promoter fragments linked to a luciferase reporter gene. A core
promoter was identified within 55 bp upstream of the transcription
start site. This promoter region contains a guanine/cytosine box
and has basal activity in YT, Kit225-k6, and Jurkat cells. A strong
enhancer activity was identified between positions -1136 and -1076, a
region that includes a STAT-like element. This enhancer region was
active in YT cells, which have constitutive perforin expression and
activated STAT3 protein, but not in Kit225-k6 or Jurkat cells, which do
not have constitutive perforin expression. Mutation of the STAT binding
site resulted in a dramatic down-regulation of promoter activity.
Electrophoretic mobility shift assays, using a probe containing the
STAT element of the perforin promoter, indicated that this element can
bind STAT3 from YT cells. Moreover, the STAT element was shown to bind
STAT5a/b induced by IL-2 as well as STAT1
induced by IL-6 in human
NK cells. Together, these results suggest that STAT proteins play a key
role in perforin gene transcription and provide a model by which
cytokines can regulate perforin gene expression.
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