NG-nitro-L-arginine methyl-ester: a muscarinic receptor antagonist?

Abstract:

:The effect of the nitric oxide synthase inhibitor NG-Nitro-L-arginine methyl ester (L-NAME) towards muscarinic receptors was studied in vitro and in vivo. L-NAME displaced the antimuscarinic ligand [3H]quinuclidinyl benzilate ([3H]QNB) from its specific binding sites in rat cerebral cortex and cerebellum homogenates with a more than 10,000 fold lower affinity than atropine, pirenzepine and AFDX 116. Data for L-NAME binding were best fit according to a two-site model (Kd 7.2 nM and 3,000 nM) in the rat cerebellum, whereas in rat cortex a one-site model (Kd 1670 nM) was superior. In anesthetized rats and rabbits L-NAME (7.5-185 mumol/kg) attenuated a hypotensive response to Acetyl beta-methyl-choline (Ac beta-Me Ch)(6.25 nmol/kg) in a dose related fashion, but this effect was negligible as compared to that of atropine (8.8 and 17.7 nmol/kg). Furthermore, the effect of L-NAME was not specifically antimuscarinic since its attenuating effect against ATP- or histamine-induced responses was not statistically different from that of Ac beta-Me Ch. A vagus stimulation induced bradycardia was entirely uninfluenced by L-NAME (37 mumol/kg). In isolated bladder experiments (rabbit) we demonstrated a complete lack of efficacy of L-NAME against Ac beta-Me Ch induced contractions. In the pithed rat preparation L-NAME was ineffective against the MeN-A-343 induced pressor responses. In summary, we demonstrated that the nitric oxide synthase inhibitor L-NAME shows very weak affinity at M1- and M2-receptors in the rat brain in vitro, but appears to have no significant antimuscarinic properties against M1-, M2- and M3-receptor mediated effects in rats and rabbits in vivo.

journal_name

Fundam Clin Pharmacol

authors

Hellmich B,Gyermek L

doi

10.1111/j.1472-8206.1997.tb00843.x

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

305-14

issue

4

eissn

0767-3981

issn

1472-8206

pii

S076739819784563X

journal_volume

11

pub_type

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