Specific GABAA circuits for visual cortical plasticity. The role of the hippocampus and 5-HT/GABA interaction in the central effects of benzodiazepine receptor ligands. The safety and efficacy of zolpidem in insomniac patients: a long-term open study in general practice. Met-enkephalin, beta-endorphin and cortisol responses to sub-maximal exercise after sleep disturbances. The hypnotics triazolam and zolpidem have identical metabolic effects throughout the brain: implications for benzodiazepine receptor subtypes. Ambien online references

Ambien online research references

Science. 2004 Mar 12;303(5664):1681-3.
Specific GABAA circuits for visual cortical plasticity.

Fagiolini M, Fritschy JM, Low K, Mohler H, Rudolph U, Hensch TK.

Laboratory for Neuronal Circuit Development, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan.

Weak inhibition within visual cortex early in life prevents experience-dependent plasticity. Loss of responsiveness to an eye deprived of vision can be initiated prematurely by enhancing gamma-aminobutyric acid (GABA)-mediated transmission with benzodiazepines. Here, we use a mouse "knockin" mutation to alpha subunits that renders individual GABA type A (GABA(A)) receptors insensitive to diazepam to show that a particular inhibitory network controls expression of the critical period. Only alpha1-containing circuits were found to drive cortical plasticity, whereas alpha2-enriched connections separately regulated neuronal firing. This dissociation carries implications for models of brain development and the safe design of benzodiazepines for use in infants.

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J Neural Transm. 1999;106(5-6):369-81.
The role of the hippocampus and 5-HT/GABA interaction in the central effects of benzodiazepine receptor ligands.

Nazar M, Siemiatkowski M, Czlonkowska A, Sienkiewicz-Jarosz H, Plaznik A.

Department of Pharmacology and Physiology of the Nervous System, Institute of Psychiatry and Neurology, Warsaw, Poland.

The effects of an intrahippocampal administering of a nonselective full (midazolam), a partial benzodiazepine (BDZ) receptor agonist (bretazenil), and a BDZ1 selective (zolpidem) receptor ligand were examined in the open field test (OFT) of neophobia and Vogel's test (VT) of conflict behavior in rats. Moreover, the influence of local injections of a noncompetitive GABA(A) receptor antagonist, picrotoxin, on the anxiolytic-like effect of serotonin (5-HT) depletion (p-chlorophenylalanine, p-CPA) in the Vogel test was studied. It was found that in the OFT only midazolam (0.1 microg/site) given to the hippocampus (HP) disinhibited rat exploratory behavior, whereas all the examined compounds inhibited animal motor activity when injected locally at 10.0 microg/site, the highest dose used in the tests. In the VT, again, only midazolam disinhibited rat conflict behavior on a dose-dependent basis. Picrotoxin administered to the HP produced a tendency to increase locomotor activity in rats, and significantly attenuated the anti-conflict action of serotonin depletion without changing the pain threshold and spontaneous drinking of the animals. p-CPA induced potent, dose-dependent and selective 5-HT and 5-hydroxyindoleacetic acid decrease in the HP after administering the dose used in the behavioral experiment. Thus, the present data provide evidence for the lack of selective anxiolytic activity of a partial non-selective agonist and a full selective agonist at the BDZ1 receptor after their administration to the HP. The model of intra-HP drug injections appeared effective in discriminating the anxiolytic spectrum of activity of new psychotropic compounds. Moreover, the obtained results indicate that the dorsal HP is one of the central sites important for GABA/5-HT interaction that modulates rat emotional behavior.

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J Int Med Res. 1992 Apr;20(2):162-70.
The safety and efficacy of zolpidem in insomniac patients: a long-term open study in general practice.

Maarek L, Cramer P, Attali P, Coquelin JP, Morselli PL.

Fonds de Recherche Medifutur, Paris, France.

The safety and efficacy of 10 or 20 mg/day zolpidem, a new hypnotic belonging to the imidazopyridine class, were studied over a 180-day period in 96 patients with sleep disorders. The treatment was continued for a further 180 days by 49 of these patients. Follow-up information from 21 patients who discontinued treatment after 180 days showed no rebound insomnia or withdrawal signs. Efficacy of treatment with respect to reduction of sleep onset latency and number of nocturnal wakenings, and improvement in duration of sleep, quality of sleep and morning wakenings was found in nearly 90% of patients and was maintained in those patients who continued treatment for 360 days. This efficacy was achieved with a stable percentage of patients receiving 10 mg/day and 20 mg/day zolpidem from day 30 to the final visit. Zolpidem, therefore, has been shown to be an effective and safe hypnotic, and to be devoid of rebound and withdrawal effects.

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Eur J Appl Physiol Occup Physiol. 1992;64(4):371-6.
Met-enkephalin, beta-endorphin and cortisol responses to sub-maximal exercise after sleep disturbances.

Mougin F, Simon-Rigaud ML, Mougin C, Bourdin H, Jacquier MC, Henriet MT, Davenne D, Kantelip JP, Magnin P, Gaillard RC.

Service de Physiopathologie Respiratoire et Cerebrale, Medecine et Biologie du Sport, CHU F-25030 Besancon, France.

The present study compared the effects of partial sleep deprivation and the effects of an intake of a hypnotic compound (zolpidem) prior to bedtime, on sleep and on hormonal and metabolic adaptations to subsequent exercise. Sleep deprivation consisted of a delayed bedtime and an early getting-up time. Eight young subjects, who slept well and were highly trained athletes, were enrolled in this study. Sleep was recorded polygraphically and the following afternoon exercise was performed on a cycle ergometer for 30 min at 75% of maximal oxygen consumption (VO2max) after a 10-min warm up. Met-enkephalin, beta-endorphin, cortisol, and lactate concentrations were measured at rest and during exercise. The data obtained after experimental sleep, with and without medication were compared with those obtained in the reference condition with normal sleep. Both types of sleep reduction decreased the total sleep time, stage 2 sleep, and rapid eye movement sleep, whereas zolpidem administration did not modify either the duration of sleep or the sleep stages. After the reference night, plasma met-enkephalin did not show any significant change at the end of the submaximal exercise, whereas beta-endorphin, cortisol, and lactic acid concentrations increased significantly in all subjects. The changes in concentration in beta-endorphin were significantly related to the changes in cortisol (r = 0.78; P less than 0.01) and to the changes in plasma lactic acid (r = 0.58; P less than 0.05). Cortisol concentrations were also related to lactic acid values (r = 0.94; P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

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Brain Res. 1991 Jul 19;554(1-2):244-52.
The hypnotics triazolam and zolpidem have identical metabolic effects throughout the brain: implications for benzodiazepine receptor subtypes.

Piercey MF, Hoffmann WE, Cooper M.

Upjohn Company, Kalamazoo, MI 49001.

Using Sokoloff's 2-deoxyglucose autoradiography procedure, the effects of trizolam, a classical benzodiazepine (BZ) hypnotic, were compared to those of zolpidem, which preferentially binds to BZ1 receptor subtypes. Triazolam depressed metabolism in 40 of the more than 60 brain regions evaluated. Zolpidem depressed metabolism in all of these areas, including the spinal cord, an area where the BZ1 receptor subtype is not supposed to exist. Zolpidem and triazolam also depressed metabolism in the molecular layer of the dentate gyrus, an area low in BZ1 receptors. Neither drug affected metabolism in 21 areas, including the regions most specific for the BZ1 subtype (cerebellum, inferior colliculus, globus pallidus, and substantia nigra pars reticularis). It is concluded that: (i) zolpidem and triazolam depress energy metabolism of the same areas of the brain, (ii) zolpidem's effects may not be mediated solely through the BZ1 receptor subtype, and (iii) the BZ2 receptor may be functionally more significant than the BZ1 receptor.

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