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Am J Physiol Lung Cell Mol Physiol 282: L684-L692, 2002. First published October 26, 2001; doi:10.1152/ajplung.00320.2000
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Vol. 282, Issue 4, L684-L692, April 2002

Pattern of NOS2 and NOS3 mRNA expression in human A549 cells and primary cultured AEC II

D. V. Pechkovsky1, G. Zissel1, T. Goldmann1, M. Einhaus2, C. Taube2, H. Magnussen2, M. Schlaak1, and J. Müller-Quernheim1

1 Medical Hospital, Research Center Borstel, 23845 Borstel; and 2 Krankenhaus Großhansdorf, 22927 Großhansdorf, Germany

The human alveolar type II epithelium-like cell line A549 expresses nitric oxide synthase type 2 (NOS2), but not NOS3, and produces nitric oxide (NO) upon appropriate stimulation. However, relatively little is known regarding the NOS2 and NOS3 expression of type II human alveolar epithelial cells (AEC II) in primary culture. We detected NOS3 mRNA in freshly isolated AEC II and after 24 h of culture. NOS3 mRNA levels were much higher in AEC II cultured for 24 h with or without interferon-gamma , interleukin-1beta , and tumor necrosis factor-alpha , compared with freshly isolated cells. Cytokine stimulation did not change the NOS3 mRNA expression level in AEC II compared with unstimulated cells. NOS3 protein expression was verified by Western blot, and measuring nitrate/nitrite revealed that the protein is active. In contrast, neither NOS2 mRNA nor protein could be detected in freshly isolated, unstimulated or cytokine-stimulated human AEC II in 24- or 72-h primary cultures, whereas A549 cells expressed NOS2 message and protein upon stimulation with proinflammatory cytokines. In situ hybridization confirmed that AEC II express NOS3, but not NOS2 mRNA in vivo. These data demonstrate that there are significant differences between primary AEC II and A549 cells in NOS mRNA expression pattern.

nitric oxide synthase; mRNA; RT-PCR; interferon-gamma ; tumor necrosis factor-alpha ; interleukin-1beta ; type II human alveolar epithelial cells; A549 cell line


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