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)

The relationship between the suppression-recovery phenomenon and sensitivity changes during light adaptation was investigated in the cone photoreceptors of the isolated, superfused bullfrog retina using barium as a tool. Barium reduced the shift of the stimulus-response function that occurs during light adaptation. Barium also reduced the maximum response amplitude seen after recovery from suppression induced by a flickering light stimulus. The effect of barium on the recovered response amplitude could not be explained by barium's known ability to attenuate the dark adapted cone response, since the magnitude of the depression of the recovered response amplitude was significantly greater at all concentrations than was the magnitude of the depression of the response of the dark adapted cones. Moreover, the thresholds for barium's effect, as well as the shapes of the dose-response curves, were quite different for the two types of responses. The results are consistent with the idea that the recovery from suppression induced by flicker is due to the same change in receptor sensitivity that manifests itself as a shift of the stimulus-response curve during light adaptation.
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PMID:The effects of barium on the suppression-recovery phenomenon in the aspartate isolated mass receptor response. 349 6

A 58-year-old male visited the Kochi Municipal Central Hospital on May 17, 1984. A barium meal study and endoscopy revealed a huge crater surrounded by a thick embankment on the posterior wall of the stomach body. Biopsy specimens taken from the lesion revealed tubular adenocarcinoma, UFT (600 mg/day) and anti-tuberculous drugs were administered due to the complication of pulmonary tuberculosis. Endoscopic examination on August 6, 1984, revealed a remarkable improvement, showing a shallow irregular depression with converging folds. The patient underwent surgery on August 7, 1984, because from the endoscopic appearance, residual cancer was highly suspect, and also tuberculosis had improved. The histology of the surgically resected specimen showed a chronic peptic ulcer, the base of which was covered with regenerating mucosa. No cancer nests were demonstrated even by serial tissue sections.
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PMID:[A case of gastric carcinoma disappearing after short-term preoperative chemotherapy]. 361 65

A patient seen at presentation for Hodgkin's disease (HD) at stage IV B was successfully treated with MOPP. In remission he developed coeliac disease, controlled by dietary measures, but 26 months after the end of chemotherapy a severe dyspeptic syndrome appeared; endoscopy and barium meal suggested the presence of a gastric tumour, which was surgically removed and showed the histological features of a non-Hodgkin's lymphoma, lympho-histiocytic type. Only moderate chemotherapy was given after the operation and the patient obtained a new complete remission which has lasted 3 years so far. It is likely that the immune depression caused by HD itself and the relevant chemotherapy may have favoured the occurrence of both coeliac disease and subsequent gastric lymphoma.
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PMID:Gastric non-Hodgkin's lymphoma after successful treatment of Hodgkin's disease. 375 40

We studied the diagnostic features of 32 early gastric carcinomas less than or equal to 1 cm in maximum diameter, which were detected in 28 patients. A correct preoperative qualitative diagnosis was made in 19% of the lesions by means of barium studies, in 72% by endoscopy, and in 90% by endoscopic biopsy. Endoscopy and endoscopic biopsies are the most useful diagnostics for detection of these small cancers. Since most carcinomas with a diameter between 6 and 10 mm have a mucosal unevenness such as a shallow depression with an irregular perimeter and are associated with or without elevated marginal mucosa on gross inspection, it was not very difficult to detect these carcinomas with careful endoscopic observations. When endoscopists procure such evidence, biopsies should be done for confirmation. Even in ulcers that appear benign, biopsies are recommended. With regard to carcinomas of less than or equal to 5 mm in diameter, it is difficult to detect the lesions, particularly the flat-type, which make up a relatively large percentage of those minute carcinomas.
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PMID:Diagnostics of small gastric carcinoma. 377 35

After permanent coronary artery occlusion, the extent of two-dimensional echocardiographically detected dyskinesis correlates well with infarct size. Reperfusion after coronary artery occlusion decreases infarct size; however, contractile function of myocardium salvaged in this way may remain depressed for several weeks. The purpose of this study was to explore the relationship between echocardiographically detected dyskinesis and infarct size in reperfused myocardium. We hypothesized that after transient coronary artery occlusion, the relationship between dyskinesis and infarct size would be altered because of the prolonged depression of contractile function after reperfusion so that dyskinesis would not predict infarct size. We also wanted to explore two related questions: (1) Does inotropic stimulation of reperfused myocardium result in improved systolic function in segments that are dysfunctional but not necrotic? (2) Does the relationship between infarct size and coronary risk region, which is linear in myocardium subjected to permanent coronary occlusion, remain linear in myocardium subjected to a sequence of occlusion and reperfusion? Thirty-seven sedated dogs with preplaced circumflex occluders underwent 1 or 2 hr of coronary artery occlusion, then 2 or 10 days of reperfusion. The percentage of the left ventricle that was dyskinetic was estimated from short-axis two-dimensional echocardiograms at the chordal and papillary muscle level obtained at control, after 1 or 2 hr of occlusion, after 20 min of reperfusion, and after 2 or 10 days of reperfusion. At 2 or 10 days of reperfusion, echocardiograms were also obtained during infusion of dobutamine. Area at risk was determined from postmortem barium-gelatin angiography and infarct size was determined at pathologic examination. We found a significant linear correlation between infarct size and risk region size in reperfused myocardium.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Echocardiographically detected dyskinesis, myocardial infarct size, and coronary risk region relationships in reperfused canine myocardium. 399 17

Polyoxyethylene (20) sorbitan monooleate (polysorbate 80, Tween 80), a surfactant, has been widely used as a solvent for pharmacological experiments. In the present study, polysorbate 80 was found to have toxicity of a low order in both the mice and rats when given by i.p. and p.o. routes. It produced mild to moderate depression of the central nervous system with a marked reduction in locomotor activity and rectal temperature, exhibited ataxia and paralytic activity and potentiated the pentobarbital sleeping time. On intravenous administration in dogs, it had a dose-dependent hypotensive effect. Polysorbate 80 did not have a direct stimulant or relaxant effect on either guinea pig ileum or rat uterus, however, it antagonised the contractions induced by acetylcholine, histamine, barium, 5-hydroxytryptamine and carbachol in a dose-dependent manner. A direct relaxant effect was observed on rabbit jejunum. A dose-dependent myocardial depressant effect was observed on guinea pig and rabbit paired atrial preparations. On the electrically-driven guinea pig left atrial preparation, polysorbate 80 exhibited a dose-dependent negative inotropic action. Polysorbate 80 did not induce diuresis in rats upto a dose of 2.5 ml/kg. The results of the present study indicate that polysorbate 80 can neither be used as a solvent for isolated tissue experiments nor when considered for intravenous administration. However, polysorbate 80 can be employed safely as a vehicle for neuropsychopharmacological experiments in doses not exceeding 1 ml/kg.
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PMID:Polysorbate 80: a pharmacological study. 402 3

1. Isolated cat adrenal glands were perfused with Locke solution, and the corticosteroid outputs in response to adrenocorticotrophin (ACTH) were studied.2. Steroid outputs varied with the ACTH concentration, as well as with the duration of exposure to a given ACTH concentration.3. Omission of calcium from the perfusion medium markedly depressed ACTH-evoked steroid release. The steroid output was directly related to the extracellular calcium concentration up to 0.5 mM.4. During a constant exposure to ACTH, steroid output was maintained for at least 2-3 hr, provided that calcium was present in the perfusion medium.5. Strontium, but not barium or magnesium, replaced calcium in maintaining the secretory response to ACTH.6. Magnesium depressed ACTH-evoked secretion in the presence of calcium, and this depression of secretion was antagonized by increasing the calcium concentration.7. Prolonged perfusion with sodium-free or potassium-free solutions did not markedly inhibit steroid output in response to ACTH. Excess potassium (56 mM) did not produce a consistent or marked increase in spontaneous steroid output and did not affect the response to ACTH.8. The steroid content of adrenal glands perfused with Locke solution and exposed to ACTH was about 10% of the amount which was secreted. By contrast, adrenal glands perfused with calcium-free media and exposed to ACTH contained much higher amounts of steroid, despite the negligible amount secreted.9. These data suggest that calcium plays a critical role in the mechanism of corticosteroid secretion from the adrenal cortex.
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PMID:On the mode of action of ACTH on the isolated perfused adrenal gland. 432 84

1. When molluscan neural somata are filled with the calcium-indicating photo-protein aequorin and subjected to a 1 Hz train of depolarizing pulses (0.3 sec duration to + 15 mV) under voltage clamp, the successive photo-emissions due to calcium influx facilitate. The origin of this phenomenon was investigated in identified neurones from the abdominal ganglion of Aplysia californica.2. Since outward currents inactivate cumulatively in successive pulses, the effective depolarization increases due to a series resistance error. Elimination of this error by electronic compensation or pharmacological block of outward current reduced aequorin response facilitation by only about 30%, on the average.3. When voltage-dependent sodium and potassium currents are blocked in tetraethylammonium (TEA)-substituted zero-sodium sea water, the remaining inward calcium currents display no facilitation. On the contrary, a slow decline during a pulse and a slight progressive depression in successive pulses are observed. Barium-substitution for calcium in the same medium eliminates a small residual potassium current insensitive to external TEA. The remaining inward barium currents also display depression instead of facilitation.4. A non-pharmacological separation of calcium current was accomplished by measuring tail currents at the potassium equilibrium potential following depolarizing pulses. Calcium tail currents activate rapidly and then decline gradually and incompletely as depolarizing pulse duration is lengthened. Tail currents also show no evidence of facilitation; there is instead a slight depression of currents after successive pulses.5. Increments of optical absorbance in neurones filled with the calcium-sensitive dye arsenazo III show a depression rather than facilitation to successive depolarizations in a train. The time course of these absorbance signals is consistent with the time-dependent depression of calcium current.6. Calibration of arsenazo III response amplitude indicates that the dye reports only about 1% of the calcium concentration increment expected from knowledge of cell volume and the charge carried by calcium current during a depolarizing pulse. This suggests that cytoplasmic buffering of free calcium must occur rapidly, on a time scale comparable to the response time of arsenazo III (about 1 msec) or more rapidly.7. The slow potassium tail current following a depolarizing pulse is calcium-dependent and probably provides an approximate index of the internal sub-membrane calcium concentration. Increments in this current after repetitive pulses display a slight progressive depression rather than facilitation.8. Since neither calcium currents nor the concentration transients show facilitation, we conclude that aequorin response facilitation is due to the non-linear dependence of aequorin photo-emissions on calcium concentration. This conclusion is supported by a finding that the very different kinetics of arsenazo III responses and aequorin responses can be reconciled by a simple model representing calcium accumulation and known response properties of the two indicator substances.9. In a train of impulses evoked by injecting depolarizing current into a neurone, the successive action potentials grow in duration. Nevertheless, a nearly constant calcium influx signalled by arsenazo III accompanies broadening action potentials.
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PMID:Aequorin response facilitation and intracellular calcium accumulation in molluscan neurones. 624 86

1. The intracellular potassium in giant neurones of Aplysia californica was replaced with caesium by a method utilizing the ionophore nystatin. Because caesium ions have low permeability through potassium channels outward currents during voltage-clamp depolarization were strongly curtailed after the caesium loading procedure and the subsequent wash-out of the ionophore. 2. The calcium current elicited by a test voltage-clamp depolarization (pulse 2) was depressed following the entry of calcium elicited by a prior depolarization (pulse 1). 3. The percentage depression of the test current was a linear function of the pulse 1 current-time integral, and thus appears to be related linearly to the amount of calcium carried into the cell during pulse 1. This linear relation was maintained when calcium entry was varied by changes in external calcium concentration, by altered pulse 1 amplitude and altered pulse 1 duration. Depression was substantially reduced by injection of EGTA, and by substitution of barium for extracellular calcium. 4. The calcium current was unaffected by prior hyperpolarization of the membrane or by prior depolarizations to about ECa. Depression of the current was not altered by addition of extracellular 50 mM-TEA or by a strong hyperpolarization between the conditioning and test pulses. 5. The rate relaxation of the inward current during a given depolarization depended on the rate of entry and accumulation of free calcium. Relaxation under a given command potential became slower when calcium was partially replaced with magnesium so as to produce a smaller calcium current, or when accumulation of intracellular free calcium was retarded by injected EGTA or by barium substitution for extracellular calcium. 6 Evidence is considered that accumulation of calcium ions at the cytoplasmic surface of the membrane leads to inactivation through an action upon the calcium conductance. Reduced driving force and intracellular surface-charge neutralization do not adequately account for the observed depression of the calcium current resulting from intracellular accumulation of calcium ions.
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PMID:Calcium-mediated inactivation of the calcium conductance in caesium-loaded giant neurones of Aplysia californica. 627 32

A wide range of clinical findings was present in 58 near-miss sudden infant death syndrome (SIDS) infants and 6 surviving twins of SIDS siblings. Specific investigations included: studies of gastro-oesophageal reflux and aspiration (24-hour oesophageal pH recordings, barium swallow, radionuclide 'milk-scan'); polygraphic studies of breathing, reflux, and sleep state; studies of upper airways disease (lateral airways radiography and endoscopy); detection of seizure activity by electroencephalography; evaluation of thiamine status by erythrocyte transketolase activity of venous blood. Thiamine deficiency was found in 12 of 43 tested infants; 5 of the deficient infants had a familial history of SIDS. Many potential mechanisms for asphyxia were found: idiopathic central apnoea (7 infants), tracheal obstruction from minimal tracheomalacia or aberrant innominate artery (4 infants), temporal lobe or generalised seizures (6 infants), gastro-oesophageal reflux (55 infants) with intrapulmonary aspiration (11 infants). The high incidence, severity, and timing of reflux were new findings. Reflux occurred in active and indeterminate sleep, but not in quiet sleep. The depression of respiratory reflexes by active sleep stresses the vulnerability to asphyxia. Two factors suggest that near-miss episodes are related to SIDS: the similar age distribution but earlier occurrence of near-miss episodes compared with age at death of SIDS infants, and the subsequent sudden death of 2 infants whose necropsies were consistent with SIDS.
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PMID:Multiple causes of asphyxia in infants at high risk for sudden infant death. 683 Mar 4


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