Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0011570 (depression)
 172,036 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In male Wistar rats PGF2alpha or PGE1 were injected intracerebroventricularly (icv) in a dose of 1 or 10 mug. Immediately or 1 hr after injection the locomotor and exploratory activity were measured. The levels of noradrenaline (NA), dopamine (DA) 5-hydroxytryptamine (5-HT), 5-hydroxyindoleacetic acid (5-HIAA) and acetylcholine (Ach) were measured in discrete brain areas. Both PGs applied ivc caused the depression of locomotor and exploratory activity in rats. PGE1 acted longer. Both substances but PGE1 more intensively affected the level of estimated biogenic amines in different brain structures. It is concluded that PGF2alpha and E1 are central nervous depressants. Both PGs affect neurons producing NA or 5-HT or Ach in discrete areas of brain in different manner. There is different susceptibility of brain structures on PGs action.
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PMID:Central effects of prostaglandins F2alpha and E1. 101 72

Propranolol (100mug) ivc together with phentolamine (60 mug) decreased spontaneous locomotor activity and weakened post-nialamide locomotor activity in rat. When applied separately in the above doses, neither of the two compounds had this action. Depression of amphetamine-induced locomotor activity was observed after propranolol (250 mug) together with phetolamine (60 mug). Phentolamine alone, had hypothermic action but when applied together with propranolol, it increased after 4 hrs body temperature. The tested compounds prolonged hexobarbital-induced sleeping time but did not affect noradrenaline or dopamine levels in rat's brain.
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PMID:The central action of intraventricularly (ivc) administered propranolol and phentolamine in rat. 116 21

As shown by examination in apparently healthy persons aged from 20 to 100 years and in experiments on 1--28-month-old albino rats there was a significant change with the progress of age in the content and ratio of catecholamines in the blood, various organs and the urine. The blood noradrenaline level fell considerably; Na/A coefficient also dropped sharply. Catecholamine content in the organs changed irregularly: in the kidneys it increased, in the skeletal muscles--remained unchanged, in the adrenal glands, the heart, the spleen and the liver--decreased. There was a significant reduction with the progress of age of the urinary excretion of adrenaline, noradrenaline, DOPA and vanilyl-amygdalic acid. Elemination of the intravenously injected noradrenaline from the blood of old rats was markedly delayed in comparison with that in the young animals. Depression of the COMT activity did not alter the noradrenaline level in the heart of adult and old rats. Administration of ipraside caused an increase in noradrenaline content in the heart of old rats, but failed to alter it in adult animals. It is suggested that in the catecholamine metabolism of old animals prevalence is given to the processes of oxidative desamination.
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PMID:[Catecholamine concentration and metabolism in old age]. 116 5

Atropine (At) and scopolamine (Sc) in low doses intensify basic activity, increase amphetamine stereotypy, and suppress catalepsy induced by injection of haloperidol. High doses lower body temperature, antagonize amphetamine stereotypy, and intensify the hypnotic action of chloral hydrate. Doses of about 1/2 LD50 induce narcotic sleep. Both At and Sc in a wide range of dosage protect against the tonic phase of convulsions produced by electroshock. Sc depresses content of acetylcholine in the brain proportionally to its dosage; At had a similar effect only at the lower of the two doses that were used. Both compounds had no effect on levels of noradrenaline and dopamine in the brain. The results indicate that low doses of blockers of the cholinergic muscarinic receptor, injected intraventricularly, produce strong central stimulation, whereas high doses produce depression of the central nervous system.
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PMID:Central action of drugs acting on the cholinergic muscarinic receptor. III. Influence of atropine and scopolamine injected intraventricularly on behavior and levels of biogenic amines in the rat brain. 117 21

Mean plasma LH concentration in postmenopausal women suffering unipolar depressive illness was 33% less than that of normal postmenopausal women (P less than 0.05). Since LH secretion after menopause is probably noradrenergically regulated, the finding provides support for the hypothesis of a functional noradrenaline deficit in depression.
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PMID:Reduced plasma LH concentration in postmenopausal depressed women. 117 96

Biochemical human post-mortem studies on depressed patients indicate an unspecific deficiency of neurotransmitters in several brain areas. The loss of drive of these patients could be correlated with a decrease of striatal dopamine concentration. Noradrenaline was significantly diminished in red nucleus, a fact which points to the characteristic posture of depressed patients. Serotonin was diminished in all brain areas. During remission all values trended to be normal. There also exists a circadian disrhythm in depressed patients resulting in lowered VMA- and HVA-levels in urines during the morning and a remission to normal values in the evening. This agrees with the findings of lowered blood tyrosine levels in the morning. The ratio of blood tyrosine and tryptophan is disturbed during depression and recovers during remission. Central and peripheral biochemical mechanisms seems to be involved in depression syndrom.
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PMID:Biochemical post-mortem findings in depressed patients. 118 63

Diazepam decreased the rate and amplitude of contraction in isolated embryonic chick hearts in a dose-dependent manner in both the noninnervated hearts obtained from 4-day-old embryos and the innervated hearts from 7-day-old embryos. The concentration of diazepam necessary to reduce the heart rate and contractile amplitude to 50% of the control values was about 1 X 10(-4) M. Concentrations less than 1.0 X 10(-5) M had no detectable depressant effects. Prior administration of atropine did not alter the depression induced by diazepam. Norepinephrine was able to stimulate the amplitude of contraction in the diazepam-depressed heart while atropine was without effect. The vehicle used in the clinical injectable preparation of diazepam had no depressant effects. The mechanism of action of the diazepam-induced depression on the isolated embryonic chick heart may be a direct depression of the myocardium.
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PMID:Effects of diazepam on the isolated chick embryo heart. 118 1

In order to define specific metabolic abnormalities of adipose tissue metabolism in endogenous hypertriglyceridemia (EH) patients with this condition were compared with normolipidemic controls matched for body fat and fat cell size. In vitro the enlarged fat cells of EH were found to have an increased basal and noradrenaline-stimulated lipolysis in comparison with cells of the same size from normolipidemic controls. The insulin inhibition of noradrenaline-stimulated lipolysis was blunted. Lipoprotein lipase activity in these cells was clearly depressed. Basal triglyceride synthesis from labeled glucose was low in relation to plasma insulin. The reduction of insulin tolerance in vivo suggested that the depression of plasma glycerol and free fatty acid concentration was small in EH, suggesting that the more detailed findings in vitro were of relevance for in vivo conditions. It was suggested that the hyperinsulinemia and decreased glucose tolerance of EH may well be responsible for some of the aberrations of adipocyte metabolism in EH. The decreased responsiveness of lipolysis to insulin and the low lipoprotein lipase activity are, however, findings not typical for enlarged fat cells exposed chronically to insulin and might be characteristic for the fat cells of EH. It seems of importance to further define the factor(s) responsible for these metabolic aberrations, because the abnormalities of the acipocyte metabolism in EH may well offer a possible explanation to the pathogenesis of that condition.
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PMID:Adipocyte metabolism in endogenous hypertriglyceridemia. 119 32

On 10 patients who had to undergo a ca. 4 hour operation of the lower abdominal region, the pattern of catecholamine excretion before, during and after operation was traced. 1. A decrease of systolic blood pressure on average of 80 mm Hg, in correlation to the concentration of Halothane and Thalamonal, was recorded. 2. The excretion of adrenaline and noradrenalin was significantly lower during anaesthesia as compared with the initial value, suggesting a depression of sympathoadrenal system. 3. The postoperative amount of adrenaline and especially noradrenaline increased markedly, when anaesthesia worn off, postoperative shivering started, and surgical wounds caused pain. 4. The excretion of urine during operation was slightly reduced, the renal output showed normal amounts, when calculated up to 24 hours. The results show, that the combined use of halothane an thalamonal because of its depressant effects on the sympathoadrenal system is capable of reducing the liberation of catecholamines during anaesthesia.
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PMID:[The course of the catecholamine excretion during combination anaesthesia with halothane and thalamonal (author's transl)]. 121 2

The effects of i.v. injected Fentanyl and droperidol used either singly or in combination were observed in 50 experiments carried out on cats which had been relaxed and artificially respirated. The preganglionic discharges of the cervical sympathetic nerve and action potentials of the phrenic nerve, the mean arterial pressure and the heart rate were recorded. The experiments showed that with the dosage of 0.0042-0.0083 mg/kg Fentanyl no significant change in the recorded functions took place. The dosage of 0.0166 mg/kg Fentanyl led to an activation of the central sympathetic activity and to a inhibition of the respiratory centre which persisted for as long as 60 min after the injections. Other than as above, a dosage of 0.15-0.6 mg/kg droperidol led to a decrease of the blood pressure and a depression of the sympathetic nerve activity, while the activity of the phrenic nerve remained unchanged. The effect on the blood pressure was mainly influenced by the central nervous system as the inhibition of the pressor effect of noradrenaline was only minimally. The dosage of 0.0083 mg/kg Fentanyl combined with 0.3 mg/kg dropendol as administered for neuroleptanalgesia led to a decrease in blood pressure and a depression of the central sympathetic and phrenic nerve activity both in rest and in stress during asphyxia. The effects were minimal and accorded virtually to the effects produced by 0.5 vol-% Halothane during the first 25 min of inhalation, which had been registered in previous experiments. Contrary to the effects of Halothane, neuroleptanalgesia produced no decrease in the heart rate, no depression on the pressor effects of noradrenaline and no accumulation of irregularities in cardiac rhythm after administration of noradrenaline.
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PMID:[The effects of neuroleptanalgesia on the sympathetic activity and the circulation in animals (author's transl)]. 121 5


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