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J Med Chem. 1994 Nov 11;37(23):3886-8.

L-N6-(1-iminoethyl)lysine: a selective inhibitor of inducible nitric oxide synthase.

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Department of Inflammatory Diseases Research, G. D. Searle Research and Development, Monsanto Company, St. Louis, Missouri 63167.


L-N6-(1-Iminoethyl)lysine (L-NIL) has been synthesized and is shown to be both a potent and selective inhibitor of mouse inducible nitric oxide synthase (miNOS). L-NIL has an IC50 of 3.3 microM for miNOS compared to an IC50 of 92 microM for rat brain constitutive NOS indicating that L-NIL is 28-fold more selective for inducible NOS. L-N5-(1-Iminoethyl)ornithine (L-NIO), which differs from L-NIL by having one less methylene group, has very similar potency for inducible NOS, but lacks selectivity. DL-N7-(1-Iminoethyl)homolysine was also synthesized and found to be substantially less potent than L-NIL or L-NIO, with intermediate selectivity for inducible NOS. These data suggest that L-NIL may be useful as a selective inhibitor of inducible NOS for determining the role of this enzyme in disease models.

[Indexed for MEDLINE]

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