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(Received for publication, November 19, 1996, and in revised form, January 23, 1997)
From the The "long pentraxins" are an emerging family
of genes that have conserved in their carboxy-terminal halves a
pentraxin domain homologous to the prototypical acute phase protein
pentraxins (C-reactive protein and serum amyloid P component) and
acquired novel amino-terminal domains. In this report, a genomic
fragment of 1371 nucleotides from the human "long pentraxin" gene
PTX3 is characterized as a promoter on tumor necrosis
factor-
Volume 272, Number 13,
Issue of March 28, 1997
pp. 8172-8178
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
ROLE OF NF-
B IN TUMOR NECROSIS FACTOR-
AND
INTERLEUKIN-1
REGULATION
,
,
,
,
,
,
§
and
Istituto di Ricerche Farmacologiche "Mario
Negri," via Eritrea, 62, 20157 Milan, Italy and the
§ Section of General Pathology and Immunology, University of
Brescia, 25123 Brescia, Italy
(TNF
) and interleukin (IL)-1
exposure in transfected
8387 human fibroblasts by chloramphenicol acetyltransferase and RNase
protection assays. In the same cells, the PTX3 promoter
does not respond to IL-6 stimulation. Furthermore, IL-1
and TNF
responsiveness is not seen in the Hep 3B hepatoma cell line. The
minimal promoter contains one NF-
B element which is shown to be
necessary for induction and able to bind p50 homodimers and p65
heterodimers but not c-Rel. Mutants in this site lose the ability to
bind NF-
B proteins and to respond to TNF
and IL-1
in
functional assays. Sp1- and AP-1 binding sites lying in proximity to
the NF-
B site do not seem to play a major role for cytokine
responsiveness. Finally, cotransfection experiments with expression
vectors validate that the natural promoter contains a functional
NF-
B site.
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