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pubmed-article:10381792pubmed:abstractTextEndothelium injury plays an important role in atherosclerosis. Damage to the endothelium results in vascular smooth muscle cell proliferation. Natriuretic peptides present a potent antimitogenic action, mediating their biological effects via the binding of guanylate cyclase-linked atrial natriuretic peptide (ANP) receptor and the production of cyclic GMP. In a previous study, we demonstrated that L-citrulline, the by-product of nitric oxide synthesis, could relax rabbit aortic rings by stimulating the guanylate cyclase-linked ANP receptor. In this work, we investigated the effect of L-citrulline on vascular smooth muscle cell proliferation. L-Citrulline (10(-8) M) significantly decreased rat aortic (A10 cell line) vascular smooth muscle proliferation. The percentage of inhibition exerted by L-citrulline on days 3, 5, and 7 of the proliferation curve was 20.0 +/- 0.5%, 37.5 +/- 8.3%, and 28. 5 +/- 7.2%, respectively. In addition, L-citrulline also inhibited serum-induced DNA synthesis, measured as 5-bromo-2'-deoxyuridine incorporation. 5-Bromo-2'-deoxyuridine incorporation into nuclei of vehicle-treated cells was 40.5 +/- 2.4%, whereas in L-citrulline-treated cells the percentage decreased to 36.0 +/- 4.1%, 29.1 +/- 2.0% (P <.01, n = 4), 30.5 +/- 2.4% (P <.05, n = 4), and 23.1 +/- 0.5% (P <.001, n = 4) for 10(-10), 10(-9), 10(-8), and 10(-7) M, respectively. Zaprinast, a phosphodiesterase type V inhibitor, enhanced 5-bromo-2'-deoxyuridine incorporation in serum-stimulated cells. Moreover, L-citrulline inhibition of serum-stimulated DNA synthesis was abolished by HS-142-1 (10(-5) M), an ANP receptor antagonist. In another group of experiments, L-citrulline was shown to increase intracellular cyclic GMP levels from 2.1 +/- 0.2 pmol of cGMP/mg protein to 4.1 +/- 0.1 for L-citrulline (10(-8) M) (P <.001, n = 3). These findings suggest that L-citrulline decreases vascular smooth muscle cell proliferation in the A10 cell line by acting on DNA synthesis by mechanisms that involve the ANP receptor.lld:pubmed
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pubmed-article:10381792pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:10381792pubmed:year1999lld:pubmed
pubmed-article:10381792pubmed:articleTitleL-Citrulline, the by-product of nitric oxide synthesis, decreases vascular smooth muscle cell proliferation.lld:pubmed
pubmed-article:10381792pubmed:affiliationDepartment of Pharmacology, School of Medicine, Complutense University, Madrid, Spain.lld:pubmed
pubmed-article:10381792pubmed:publicationTypeJournal Articlelld:pubmed