Effect of nitric oxide synthase substrate analog inhibitors on rat liver arginase.

Abstract:

:Nitric oxide synthase (EC 1.14.23) substrate analog inhibitors NG-monomethyl-L-Arg, NG-nitro-L-Arg, NG-nitro-L-Arg methyl ester, and aminoguanidine were examined as potential inhibitors of rat liver arginase (EC 3.5.3.1). NG-nitro-L-Arg was found to inhibit arginase catalyzed conversion of L-Arg to L-Orn at pH 7.5 with an IC50 = 27.2 +/- 4.3 mM, compared to L-Val and L-Lys with IC50 values of 6.2 +/- 0.4 mM and 31.3 +/- 2.7 mM, respectively. Inhibition was stereospecific for the L-amino acid, not NG-nitro-D-Arg, and required a free alpha-carboxyl group. NG-nitro-L-Arg was not a substrate for rat liver arginase. These results suggest that arginase inhibition should also be evaluated when studying the effects of NOS substrate analog inhibitors in vivo.

authors

Robertson CA,Green BG,Niedzwiecki L,Harrison RK,Grant SK

doi

10.1006/bbrc.1993.2510

subject

Has Abstract

pub_date

1993-12-15 00:00:00

pages

523-8

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(83)72510-6

journal_volume

197

pub_type

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