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Diabetes, Vol 49, Issue 9 1561-1570, Copyright © 2000 by American Diabetes Association
Endothelin 1 transcription is controlled by nuclear factor-kappaB in AGE-stimulated cultured endothelial cells
P Quehenberger, A Bierhaus, P Fasching, C Muellner, M Klevesath, M Hong, G Stier, M Sattler, E Schleicher, W Speiser and PP Nawroth
Department of Medical and Chemical Laboratory Diagnostics, University of Vienna, Austria.
Incubation of bovine aortic endothelial cells (BAECs) with erythrocytes
from patients with type 2 diabetes induced an increase in endothelin 1
(ET-1) production. The effect of erythrocytes on ET-1 synthesis was
dependent on glycemic control. ET-1 levels after incubation with
erythrocytes derived from patients with HbA(1c) levels <6% were just
half the levels observed after incubation with erythrocytes from patients
with HbA(1c) levels >8%. Nepsilon-(carboxymethyl)lysine (CML)-containing
protein isolated from patients' erythrocytes induced ET-1, and
CML-containing protein-dependent ET-1 induction was blocked by the
recombinant decoy peptide soluble receptor for advanced glycation end
products (AGEs), which comprises the NH2-terminal Ig domain of the receptor
for AGEs. In vitro-generated AGEs induced ET-1 mRNA transcription (nuclear
run-on assay and Northern blot) in a time- and dose-dependent manner.
Transient transfection of BAECs with a chimeric construct containing the 5'
promoter region of the ET-1 gene linked to a reporter gene confirmed that
AGE induced ET-1 promoter activity. Electrophoretic mobility shift assay
confirmed AGE-inducible binding of members of the nuclear factor-kappab
(NF-kappaB) family to a potential binding site at -2,090 bp. Binding was
functionally significant because overexpression of the cytoplasmic
inhibitor of NF-kappaB or deletion of the NF-kappaB binding site reduced
ET-1 induction, whereas overexpression of NF-kappaB p65 induced ET-1 even
in the absence of AGEs. Thus, ET-1 transcription is controlled by the
AGE-inducible redox-sensitive transcription factor NF-kappaB.

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Copyright © 2000 by the American Diabetes Association.
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