Abstract
1. The involvement of nitric oxide (NO) in the regulation of angiogenesis was examined in the in vivo system of the chorioallantoic membrane (CAM) of the chick embryo and in the matrigel tube formation assay. 2. Sodium nitroprusside (SNP) (0.37-28 nmol/disc), which releases NO spontaneously, caused a dose-dependent inhibition of angiogenesis in the CAM in vivo and reversed completely the angiogenic effects of alpha-thrombin (6.7 nmol/disc) and the protein kinase C (PKC) activator 4-beta-phorbol-12-myristate-13-acetate (PMA) (0.97 nmol/disc). In addition, SNP (28 x 10(-6) M) stimulated the release of guanosine 3'-5'-cyclic monophosphate (cyclic GMP) from the CAM in vitro. 3. In the matrigel tube formation assay, an in vitro assay of angiogenesis, both SNP (1-3 x 10(-6) M) and the cell permeable cyclic GMP analogue, Br-cGMP (0.3-1.0 x 10(-3) M) reduced tube formation. 4. The inhibitors of NO synthase, NG-monomethyl-L-arginine (L-NMMA) (3.8-102 nmol/disc) and NG-nitro-L-arginine methylester (L-NAME) (1.3-34.2 nmol/disc) stimulated angiogenesis in the CAM in vivo, in a dose-dependent fashion. D-NMMA and D-NAME on the other hand had no effect on angiogenesis in this system. 5. L-Arginine (10.9 nmol/disc), although it had a modest antiangiogenic effect by itself, was capable of abolishing the angiogenic effects of L-NMMA (34.2 nmol/disc) and of L-NAME (3.8 nmol/disc). 6. Dexamethasone, an inhibitor of the induction of NO synthase, at 0.2-116.1 nmol/disc, stimulated angiogenesis in the CAM, whereas at 348.4-1161 nmol/disc it inhibited this process. Combination of 38.7 nmol/disc dexamethasone with L-NAME (9.3 nmol/disc) resulted in a potentiation of the angiogenic effect of the former. It appears therefore that both the constitutive and the inducible NO synthase may contribute to the NO-mediated inhibition of angiogenesis.(ABSTRACT TRUNCATED AT 250 WORDS)
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