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B in Proximal Tubule Cells
Department of Renal Medicine, The University of Sydney at Westmead Hospital, Westmead, Australia.
Correspondence to A/Prof. David C. H. Harris, Department of Renal Medicine, Westmead Hospital, Westmead NSW 2145, Australia. Phone: 61-2-9845-7388; Fax: 61-2-9633-9351; E-mail: dch{at}renal.wh.usyd.edu.au
Abstract. The transcription and translation of monocyte
chemoattractant protein-1 (MCP-1), a CC chemokine, are increased in proximal
tubule epithelial cells (PTC) stimulated with pathophysiologically relevant
concentrations of albumin. The purpose of this study was to investigate
whether nuclear factor
B (NF
B)/Rel proteins play a role in
albumin-induced MCP-1 transcription. Confluent monolayers of rat PTC in
primary culture were stimulated with delipidated bovine serum albumin.
NF
B, the NF
B inhibitory protein (I
B), and MCP-1
transcription were assessed using electrophoretic mobility shift assays,
Western immunoblotting, semiquantitative reverse transcription-PCR, and
ribonuclease protection assays. Activation of NF
B by delipidated bovine
serum albumin (15 mg/ml) was detectable within 2 h, maximal after 8 h, and
maintained for at least 16 h of continuous exposure. Supershift analysis
showed that the activated proteins were composed of p50/p50, p50/p65, and
p50/c-Rel dimers. dimers. Cytoplasmic I
B
levels were decreased
30 min after stimulation and returned to unstimulated levels by 4 to 8 h.
I
Bß levels were decreased at 2 h and there was no recovery until 8
h. Inhibition of NF
B with pharmacologic agents
(N-tosyl-phenylalanine chloromethyl ketone and dexamethasone) and an
antisense oligonucleotide to the rat p65 subunit of NF
B significantly
reduced MCP-1 transcription. The 3.6-kb 5' flanking region of the rat
MCP-1 gene was cloned and sequenced, and two putative
B binding sites
were identified within the enhancer region. Therefore, albumin increased
NF
B and reduced I
B levels in PTC, and MCP-1 expression was
dependent on NF
B activation. It is concluded that the activation of
NF
B/Rel proteins modulates chemokine production in PTC in response to
albumin and is likely to have an important role in the mediation of
tubulointerstitial injury in proteinuric renal disease.
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