Zolpidem binding sites on the GABA(A) receptor in brain from human cirrhotic and non-cirrhotic alcoholics. Chronic zolpidem treatment alters GABA(A) receptor mRNA levels in the rat cortex. Differences in enhancing effects of zolpidem and benzodiazepine drugs on recurrent inhibition in rat hippocampal slices. Ambien online references

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Two selective radioligands of gamma aminobutyric acid (GABA)A receptors containing the alpha5 subunit, [3H]L655,708 and [3H]RY80, were evaluated in rats as potential in vivo tracers for positron emission tomography (PET). Brain uptake index (BUI), a measure of first pass extraction, was moderate for [3H]L655,708 (BUI of 59%) and good for [3H]RY80 (BUI of 96%). This finding was consistent with their in vitro binding to plasma proteins of approximately 76% and 50%, respectively. Following intravenous injection of either radioligand, radioactivity in plasma was measured and uptake characteristics were assessed in brain within a time period relevant to PET scanning (up to 90 min). Discrete brain regions, such as frontal cortex, striatum, hypothalamus, thalamus, hippocampus, colliculi, medulla, and cerebellum, were sampled and the temporal distribution of radioactivity analysed. Despite the reasonable delivery to the brain, neither of the radioligands had sufficient retention in the tissues rich in alpha5-containing GABA(A) receptors to achieve a good selective signal. For both radioligands, a maximal tissue:cerebellum ratio of 1.5 was seen in hippocampus at 10 min after injection. Thus, neither of the compounds studied shows potential for further development as an in vivo PET ligand.

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Dopamine metabolism, as reflected by the concentration of dihydroxyphenylacetic acid (DOPAC), in the medial prefrontal cortex was significantly increased following 30 min immobilisation stress or systemic administration of the benzodiazepine/GABA(A) receptor inverse agonist methyl-6,7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate (DMCM). The response to stress was attenuated by pretreatment of rats with the benzodiazepine/GABA(A) receptor agonists diazepam and zolpidem. Furthermore, pretreatment with R-(+)-3-amino-1-hydroxypyrrolid-2-one (R-(+)-HA-966), a low efficacy partial agonist, and 7-chloro-4-hydroxy-3(3-phenoxy) phenylquinolin-2-(H)-one (L-701,324) a novel, high affinity, full antagonist at the glycine/NMDA receptor attenuated the response to both stress and DMCM. These results demonstrate that antagonists at the glycine/NMDA receptor complex are comparable with benzodiazepine/GABA(A) receptor agonists in their ability to prevent activation of the mesocortical dopamine system by stress and GABA(A) receptor inverse agonists. Results are discussed in relation to the interaction between glycine/NMDA receptor antagonists, the mesocorticolimbic dopamine system and stress related disorders.

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Eur J Pharmacol. 1997 May 20;326(2-3):265-72.
Zolpidem binding sites on the GABA(A) receptor in brain from human cirrhotic and non-cirrhotic alcoholics.

Lewohl JM, Crane DI, Dodd PR.

Clinical Research Laboratory, Royal Brisbane Hospital Research Foundation, Bancroft Centre, Queensland, Australia.

The displacement of [3H]flunitrazepam by unlabelled flunitrazepam or zolpidem was used to assess the affinity and density of sub-types of GABA(A) receptors in the superior frontal and primary motor cortices of ten alcoholic, seven alcoholic-cirrhotic and ten matched control cases. The binding was best fitted by a model with a single site for flunitrazepam, but two sites for zolpidem. Neither the patients' age nor the post-mortem interval were significantly correlated with the affinity or density of any of the binding sites. The affinity of all ligands did not differ either between cortical regions or across case groups. Hence, the density of each binding site was analyzed at constant affinity. The densities of flunitrazepam and high-affinity zolpidem binding sites were invariant across cortical regions and case groups. Low-affinity zolpidem binding sites were significantly more dense in the frontal than in the motor cortex of alcoholic cases irrespective of cirrhosis, whereas this regional difference was not significant in control cases.

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Eur J Pharmacol. 1997 Jun 25;329(2-3):129-32.
Chronic zolpidem treatment alters GABA(A) receptor mRNA levels in the rat cortex.

Holt RA, Bateson AN, Martin IL.

Department of Pharmacology, University of Alberta, Edmonton, Canada.

The effect of chronic zolpidem treatment on the steady-state levels of gamma-aminobutyric acidA alpha1-6, beta1-3 and gamma1-3 subunit mRNAs in rat cortex has been investigated. Male Sprague-Dawley rats were injected once daily, for 7 or 14 days, with 15 mg/kg of zolpidem in sesame oil vehicle. The levels of the alpha4 and beta1 subunit mRNAs were significantly increased after 7 days of treatment and the level of alpha1 subunit mRNA was significantly decreased after 14 days of treatment, as determined by solution hybridization. These results are compared to the previously determined effects of an equivalent schedule of treatment with diazepam.

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Psychopharmacology (Berl). 1997 Jun;131(4):394-8.
Differences in enhancing effects of zolpidem and benzodiazepine drugs on recurrent inhibition in rat hippocampal slices.

Higashima M, Kinoshita H, Yamaguchi N, Koshino Y.

Department of Neuropsychiatry, School of Medicine, Kanazawa University, Japan.

It has been reported that the clinical and electroencephalographic profiles of zolpidem, a non-benzodiazepine drug which binds preferentially to the omega 1 benzodiazepine recognition sites located within the GABAA receptor complex, are different from those of benzodiazepine drugs, which bind non-selectively to the omega 1 and omega 2 sites. In order to clarify the electrophysiological mechanism underlying the unique profile of zolpidem, the present study compared the enhancing effects of zolpidem and two benzodiazepine drugs, triazolam and diazepam, on recurrent inhibition. This inhibition was expressed as suppression of the orthodromically induced population spikes by the preceding antidromic stimulation of the alveus in the CA1 region of rat hippocampal slices. The rank order of potency for enhancing recurrent inhibition was triazolam > diazepam > zolpidem. From the present results and previously reported findings that zolpidem has a lower affinity for the omega 2 sites than diazepam while both have the same affinity for the omega 1 sites, we concluded that the hippocampal recurrent inhibition appears to be enhanced mainly by activation of the omega 2 sites, but not by that of the omega 1 sites. Furthermore, the lower potency of zolpidem for enhancing recurrent inhibition may underlie its unique profile in terms of its clinical and electroencephalographic effects.

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