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 Pharmacoljournal_title
Fundamental & clinical pharmacologyauthors
Hellmich B,Gyermek Ldoi
10.1111/j.1472-8206.1997.tb00843.xsubject
Has Abstractpub_date
1997-01-01 00:00:00pages
305-14issue
4eissn
0767-3981issn
1472-8206pii
S076739819784563Xjournal_volume
11pub_type
杂志文章abstract::The effects of hydrocortisone, triamcinolone, prednisolone and dexamethasone have been investigated in vitro using mitochondria isolated from rat brain. Respiratory control ratio (RCR), oxygen consumption, ATP synthesis, enzymatic activities of involved complexes and superoxide anion generation have been measured to a...
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abstract::Angiotensin II AT1 receptor blockade (AT1-) has been shown to prolong survival in post-myocardial infarction (MI) heart failure in rats. In this study, we investigated whether an early AT1-induced improvement in coronary vasodilatation reserve (CVR) might be involved in this beneficial effect. Wistar rats with MI were...
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abstract::Pharmacoepidemiological studies have reported an excess of mortality with selegiline, a MAO B inhibitor used in the treatment of Parkinson's disease. The mechanism of this putative adverse effect remains unknown but an interaction with the sympathetic nervous system was suggested. The aim of the present study was to i...
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abstract::The effects of tacrine and physostigmine on catecholamine secretion induced by veratridine and high K+, and on voltage-dependent Na+ and Ca2+ currents, were investigated in guinea-pig adrenal chromaffin cells. In perfused adrenal glands, tacrine (100 microM) caused an inhibition of veratridine-induced catecholamine se...
journal_title:Fundamental & clinical pharmacology
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doi:10.1111/j.1472-8206.1998.tb00955.x
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journal_title:Fundamental & clinical pharmacology
pub_type: 杂志文章
doi:10.1111/j.1472-8206.1993.tb00224.x
更新日期:1993-01-01 00:00:00
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journal_title:Fundamental & clinical pharmacology
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doi:10.1046/j.1472-8206.2001.00043.x
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abstract::In addition to their direct effects on cardiac contractility, a number of positive inotropic agents also induce, through direct peripheral vasodilation, a reduction in afterload which is of major importance in their beneficial effects in the treatment of congestive heart failure. However, the induced increase in cardi...
journal_title:Fundamental & clinical pharmacology
pub_type: 杂志文章
doi:10.1111/j.1472-8206.1991.tb00759.x
更新日期:1991-01-01 00:00:00
abstract::Pyroglutamic acid (PCA) was compared with placebo in a randomized, double blind trial for assessing its efficacy in treating memory deficits in 40 aged subjects. Twenty subjects were treated with PCA and 20 with placebo over a period of 60 d. Memory functions were evaluated at baseline and after 60 d of treatment by m...
journal_title:Fundamental & clinical pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
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abstract::A combination of sub-effective doses of thioperamide (7.5 mg/kg, i.p.) and tacrine (0.5 mg/kg, i.p.) enhanced performance in a spatial memory task in mice. This was shown by a significant increase in their spontaneous alternation scores in a cross maze test. ...
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更新日期:2005-10-01 00:00:00