By David Holme, Hazel Peck

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The inhibitory effects of NO on COX may, however, be through nitrotyrosylation or interaction with the heme center (112). Alternatively, NO can inhibit the induction of cyclooxygenase protein (114), although the mechanism by which this occurs is unknown. As mentioned previously, NO activates cGMP-dependent kinase, interacts directly with nucleuotides, affects iron homeostasis, and may also, through nitrotyrosylation, inhibit the binding of NF-κβ to DNA (115). Arginases It is now known that NOS activity can be regulated by the modulation of substrate availability in the presence of arginases.

Proc Natl Acad Sci USA 1994; 91:5212–5216. Guetz RM, Morano I, Calovini T, Studer R, Holts J. Increased expression of endothelial constitutive nitric oxide synthase during pregnancy. Biochem Biophys Res Commun 1994; 205:905–910. Kleinert H, Wallerath T, Euchenhofer CE, Biedert I, Li H, Forsterman U. Estrogens increase transcription of the human endothelial NO synthase gene: analysis of the transcription factors involved. Hypertension 1998; 31:582–588. Green LC, Ruiz de Luzuriaga K, Wagner DA, Rand W, Istfan N, Young RV, Tannenbaum SR.

Therefore, there is a distinct difference in the requirements for iNOS induction in human compared to mouse, which may explain the difficulty in inducing iNOS gene expression in vitro in humans-compared to rodent cells (79). VI. Classification of NOS Isoforms After the different forms of NOS had been purified, antibodies were raised that recognized nNOS, eNOS, or iNOS. Studies using these antibodies revealed that NOS isoforms were expressed in other cell types. For instance, nNOS is present in epithelial as well as smooth muscle cells of the airway and gut (21).

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Analytical Biochemistry by David Holme, Hazel Peck

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