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Research ArticleArticle

Nuclear Factor-κB Mediates Simultaneous Induction of Inducible Nitric-Oxide Synthase and Up-Regulation of the Cationic Amino Acid Transporter CAT-2B in Rat Alveolar Macrophages

Rainer Hammermann, Maria Donata Messeri Dreißig, Jutta Mössner, Margarita Fuhrmann, Liberato Berrino, Manfred Göthert and Kurt Racké
Molecular Pharmacology December 2000, 58 (6) 1294-1302; DOI: https://doi.org/10.1124/mol.58.6.1294
Rainer Hammermann
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Maria Donata Messeri Dreißig
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Jutta Mössner
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Margarita Fuhrmann
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Liberato Berrino
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Manfred Göthert
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Kurt Racké
Institute of Pharmacology and Toxicology, Rheinische Friedrich Wilhelms University, Bonn, Germany
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Abstract

The connection between the regulation of l-arginine transport and nitric oxide (NO) synthesis was studied in rat alveolar macrophages. Lipopolysaccharides (LPSs) and interferon-γ stimulated in the same concentration- and time-dependent manner NO synthesis (measured by nitrite accumulation) andl-[3H]arginine uptake. This correlated with an increased mRNA expression for iNOS and the cationic amino acid transporter CAT-2B (analyzed by reverse transcription-polymerase chain reaction), with the same kinetics observed for the up-regulation of both mRNAs. Because nuclear factor-κB (NF-κB) is essential for induction of iNOS its role for the regulation of CAT-2B expression andl-arginine transport was investigated. The NF-κB inhibitors pyrrolidine dithiocarbamate andN α-p-tosyl-l-lysine chloromethyl ketone abrogated LPS- and interferon-γ-induced increase of nitrite accumulation and l-[3H]arginine uptake as well as up-regulation of iNOS and CAT-2B mRNA. LPS-induced increase in iNOS and CAT-2B mRNA was also suppressed by specific NF-κB decoy oligodesoxynucleotides, confirming the essential role of NF-κB for iNOS and CAT-2B expression. Dexamethasone did not affect the initial (5 h) LPS-induced increase of iNOS and CAT-2B mRNA, but down-regulated both mRNAs after prolonged (20 h) exposure and this was accompanied by partial inhibition of LPS-stimulated nitrite accumulation and l-[3H]arginine uptake. These findings demonstrate parallel regulation of the expression of iNOS and CAT-2B, and of NO synthesis and l-arginine uptake in rat alveolar macrophages. NF-κB is an essential transcription factor not only for the induction of iNOS, but also for the up-regulation of CAT-2B. The simultaneous up-regulation of CAT-2B with iNOS is considered as a mechanism to ensure a high substrate supply for iNOS.

Footnotes

    • Received March 23, 2000.
    • Accepted September 7, 2000.
  • Send reprint requests to: Dr. Rainer Hammermann, Institute of Pharmacology and Toxicology, University of Bonn, Reuterstr. 2b, D-53113 Bonn, Germany. E-mail:r.hammermann{at}uni-bonn.de

  • ↵1 Current address: Institute of Pharmacology and Toxicology, II University of Naples, Naples, Italy.

  • This work was supported by Deutsche Forschungsgemeinschaft (Ra 400/9-1 and 9-2). M.D.M.D. and L.B. were supported by travel grants of the “Vigoni Programm” of the Deutsche Akademische Auslandsdienst and the Conferenza Permanente dei Rettori delle UniversitàItaliane, respectively.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 58 (6)
Molecular Pharmacology
Vol. 58, Issue 6
1 Dec 2000
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Research ArticleArticle

Nuclear Factor-κB Mediates Simultaneous Induction of Inducible Nitric-Oxide Synthase and Up-Regulation of the Cationic Amino Acid Transporter CAT-2B in Rat Alveolar Macrophages

Rainer Hammermann, Maria Donata Messeri Dreißig, Jutta Mössner, Margarita Fuhrmann, Liberato Berrino, Manfred Göthert and Kurt Racké
Molecular Pharmacology December 1, 2000, 58 (6) 1294-1302; DOI: https://doi.org/10.1124/mol.58.6.1294

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Research ArticleArticle

Nuclear Factor-κB Mediates Simultaneous Induction of Inducible Nitric-Oxide Synthase and Up-Regulation of the Cationic Amino Acid Transporter CAT-2B in Rat Alveolar Macrophages

Rainer Hammermann, Maria Donata Messeri Dreißig, Jutta Mössner, Margarita Fuhrmann, Liberato Berrino, Manfred Göthert and Kurt Racké
Molecular Pharmacology December 1, 2000, 58 (6) 1294-1302; DOI: https://doi.org/10.1124/mol.58.6.1294
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