Search Results
Results 401 - 450 of 540
< 1 2 3 4 5 6 7 8 9 10 11 >
Pegg A E - - 1985
Treatment of rats with spermidine, spermine or sym-norspermidine led to a substantial induction of spermidine/spermine N1-acetyltransferase activity in liver, kidney and lung. The increase in this enzyme, which was determined independently of other acetylases by using a specific antiserum, accounted for all of the increased acetylase activity in extracts from ...
Di Stefano A - - 1985
We have studied, in vivo, the catabolism of purine nucleotides (inosinic, guanylic and adenylic acid) in the rat and its regulation by the glucocorticoid hormones, following the behavior of liver xanthine oxidase and the incorporation of formate-14C into urinary allantoin. An original method for purification of urinary allantoin has been ...
Hämäläinen M M - - 1985
The effect of peroral administration of xylitol on the absorption of iron and the activities of xanthine oxidase (EC 1.2.3.2) and ferroxidase in rat duodenal wall was studied. Adult male rats were given the basal diet containing 200 g xylitol/kg or the same diet containing no added carbohydrates for 8 ...
Heikkila R E - - 1985
The administration of the 1-methyl-4-phenylpyridinium ion (MPP+) stereotaxically into the left neostriatum or left median forebrain bundle of female rats resulted in a very large and highly significant loss of dopamine and of its metabolites in the left neostriatum. The effect of MPP+ on neostriatal dopamine content was in general ...
Johnson M - - 1985
Cat and rat brain monoamine oxidase (MAO) activity was measured with a radioisotopic procedure and two extraction methods. Results indicated an underestimation of MAO activity when liquid ion exchange chromatography (LIEC) was used instead of an ion exchange chromatographic method (IEC) to separate the different products of the deaminated tyramine, ...
Frederiks W M - - 1985
The tetrazolium method for the histochemical detection of monoamine oxidase (MAO) activity in rat liver cryostat sections has been tested for its specificity and its possible use in quantification. The tetrazolium salt tetranitro blue tetrazolium is recommended for the localization of MAO activity, rather than nitro blue tetrazolium or BPST ...
Beal M F - - 1985
Somatostatin-28(1-12) concentrations were measured in Huntington's disease (HD) postmortem tissue using a specific radioimmunoassay. Concentrations of immunoreactive somatostatin-28(1-12) were significantly increased in the caudate and putamen but were unchanged in cortical areas A9 and A17. Since somatostatin-28(1-12) terminates with the amino acids Arg-Glu-OH, we examined whether this dodecapeptide compound might ...
Escrivá F - - 1985
The effect of undernutrition from the 16th day of pregnancy up to 70th day of life on blood glucose and ketone bodies and on several brain mitochondrial enzymes related to energy metabolism or biosynthetic function was investigated. Undernutrition in perinatal period was established by means of a food restriction to ...
Poole A - - 1985
The levels of two enzymes of collagen biosynthesis namely lysyl oxidase and prolyl hydroxylase were measured in the lungs of rats 3 and 6 weeks after receiving a single intratracheal instillation of silica or sterile saline. Circulating levels of lysyl oxidase were also estimated. Significant increased lung-enzyme activities were observed ...
Talwar H S - - 1985
Oral feeding of sodium glycolate (50 mg/d/rat for ten days) caused a significant (P less than 0.001) increase in oxalate and taurine excretion and a decrease in liver protein content (P less than 0.05), glycolic acid oxidase levels (P less than 0.01), and glycolic acid dehydrogenase levels (P less than ...
Moreno S N - - 1985
At a concentration much lower than that usually employed for measuring cytosolic ionized Ca2+ concentrations, arsenazo III underwent a one-electron reduction by rat liver cytosolic fraction or a hypoxanthine-xanthine oxidase system to produce an azo anion radical metabolite. NADH, NADPH, N1-methylnicotinamide, hypoxanthine, and xanthine, in that order, could serve as ...
Müller P - - 1985
The inhibition constants of several aldose reductase inhibitors were determined using water-soluble extracts of bovine and rat lenses. The most potent inhibitor was the Alcon compound AL-1576; the inhibitory effects of AL-1567 and Sorbinil were about equal, but both were less effective than AL-1576, and the least effective inhibitor was ...
Agarwal D P - - 1985
Rats were treated with amphetamine to induce an amphetamine psychosis which resembles paranoid schizophrenia. Brain catecholamines, brain beta-endorphin, serum prolactin as well as catechol-O-methyltransferase and monoamine oxidase were subsequently measured. The norepinephrine levels were significantly lower in brain regions of rats treated with amphetamine whereas levels of dopamine and beta-endorphin ...
Schläppi B - - 1985
In phenobarbital-pretreated rats iproniazid produces distinct hepatotoxic symptoms, whereas moclobemide (Ro 11-1163) does not. Iproniazid's hepatotoxic effect is most impressive in histopathology where marked liver necrosis can be seen. Differences between the two compounds are also noted in the body weight development, mortalities and some haematological and blood chemistry parameters. ...
Stenström A - - 1985
Hemitransection of the left side of rat brain results in a selective increase (40%) in the activity of MAO-B in the left side striatum, as compared to the right, unoperated side. This increase is shown to be the result of an increase in the activity of extraneuronal MAO-B using a ...
Seiler N - - 1985
Complete inhibition of polyamine catabolism is possible by combined administration of two compounds. Aminoguanidine (25 mg/kg body wt., intraperitoneally) inhibits all reactions that are catalysed by copper-containing amine oxidases (CuAO). The products of the CuAO-catalysed reactions cannot be reconverted into polyamines (terminal catabolism) and therefore usually escape observation. N1-Methyl-N2-(buta-2,3-dienyl)butane-1,4-diamine (MDL ...
Krukoff T L - - 1984
We have previously described an increase of cytochrome oxidase (COX) activity in discrete hypothalamic nuclei of the Brattleboro rat (BR). The present experiments were done to investigate whether this increase in COX activity could be eliminated by administration of exogenous arginine vasopressin (AVP). Continuous infusion of AVP to BR for ...
Eriksson M - - 1984
The in vitro inhibition by mexiletine and related compounds of the activity of rat brain, heart and lung monoamine oxidase-A (MAO-A), rat brain MAO-B, human platelet-poor plasma benzylamine oxidase and a clorgyline-resistant, semicarbazide-sensitive amine oxidase (SSAO) distinct from both MAO and benzylamine oxidase has been studied. The compounds were most ...
David J C - - 1984
p-Octopamine and phenylethanolamine are present in the embryonic rat brain earlier than catecholamines. These phenolamines are localized mainly in the hypothalamus, where the level of p-octopamine is very high. The parallel developmental study of the activities of dopamine beta-hydroxylase, 3,4-dihydroxyphenylalanine decarboxylase, tyrosine hydroxylase, and monoamine oxidase shows that phenolamines are ...
Renner K J - - 1984
A previously described high performance liquid chromatographic method for simultaneously measuring norepinephrine, dopamine, serotonin and 5-hydroxyindole acetic acid has been modified to permit analysis of the monoamines in microdissected brain nuclei from a single rat. Results of measurements in 12 nuclei of young and middle aged male rats are presented.
Bitonti A J - - 1984
ADP-ribosylation by cholera toxin of the guanine nucleotide binding regulatory protein (Gs) of rat liver membrane adenylate cyclase was inhibited by 0.1-1 mM MDL 12330A or 0.1-1 mM chlorpromazine. Basal as well as cholera toxin activated adenylate cyclase activity in liver membranes was also inhibited by the two drugs. NAD ...
Kuehn L - - 1984
The serine proteinase inhibitory capacity in the cytosolic fraction of rat skeletal muscle tissue is accounted for by several discrete inhibitory activities. Three of these activities are identical with the proteinase inhibitors alpha 1-proteinase inhibitor, rat proteinase inhibitor I and rat proteinase inhibitor I I respectively, which have been recently ...
Clare D A - - 1984
Sulfhydryl oxidase activity is present in cow, goat, sow, human, and rat milks, and can also be measured in several rat tissues following homogenization in 1% polyoxyethylene-9-lauryl ether. These include lactating mammary tissue, kidney, and pancreas. Bovine kidney homogenates also exhibit sulfhydryl oxidase activity; however, no activity could be detected ...
Tönjes R - - 1984
The effect of pargyline on 5 HT concentration in a combined forebrain and midbrain section ( FMB ) have been investigated in female rats which were temporarily deprived from their dams in postnatal life and daily injected with the monoamine oxidase inhibitor. Two hours after the last pargyline injection a ...
Yu P H - - 1984
Capillaries were isolated from young and adult rat brain and the mitochondrial type A and B monoamine oxidase activities in these endothelial cells were determined. Type A activity was observed to be predominant in both young and adult rats and was increased with maturation while type B activity remained unchanged. ...
Marley E - - 1984
Rats pretreated with tranylcypromine and given clomipramine, developed head and body twitches, forelimb flexor-extensor movements and wet dog shakes, phenomena which failed to develop when pretreatment incorporated p-chlorophenylalanine (PCPA) but were unabated when this included alpha-methyl-p-tyrosine (AMPT). Locomotor activity, itself enhanced by tranylcypromine, was further and significantly elevated compared to ...
Reches A - - 1984
OMD inhibits L-DOPA utilization in rat corpus striatum. This effect is probably mediated through competition with L-DOPA for brain uptake mechanism. Such competition may explain the inhibition exerted by OMD on L-DOPA-induced rotation in rats with unilateral destruction of the nigrostriatal pathway. U-0521, a potent COMT inhibitor, was shown, after ...
Buckman T D - - 1983
Liposomes of phosphatidylserine (PS) were found to inhibit strongly the B-form of membrane bound monoamine oxidase (MAO) isolated from rat and bovine liver, while having no effect on the rat liver A-form. Use of 14C-liposomes demonstrated high levels of PS association with the membrane, which could not be removed by ...
Kolarov J - - 1983
Rat liver protoporphyrinogen IX oxidase is not formed in mitochondria in contrast to the claims made for the yeast enzyme (Poulson and Polglase, FEBS Lett. (1974) 40, 258). Inhibition of mitochondrial protein synthesis in regenerating rat livers by thiamphenicol led, instead, to a slight increase in protoporphyrinogen oxidase activity. Protoporphyrinogen ...
Bugnon C - - 1983
An acute reserpine treatment has the same selective and marked depleting effect on corticoliberin-like immunoreactivity as on vasopressin-like immunoreactivity in the rat zona externa of the median eminence. Somatostatin and gonadoliberin immunoreactivities appear unmodified. Reserpine effect is blocked by pretreatment with monoamine oxidase inhibitors (pargyline or tranylcypromine). Present results support ...
Shibata S - - 1983
A study was undertaken of the effects of iontophoretically applied amino acids, acetylcholine and monoamines on suprachiasmatic nucleus (SCN) neurons of rat pups, at the 11th postnatal day, using a hypothalamic slice preparation. GABA and taurine inhibited 97 and 42% of SCN neurons, respectively, while glycine had no effect. Glutamate ...
Strolin Benedetti M - - 1983
In both rat brain and heart, noradrenaline and 5-hydroxytryptamine are metabolised predominantly by monoamine oxidase-A. The Km values for 14C-noradrenaline in the rat brain and heart are 290 microM and 300 microM, respectively, whereas for 14C-5-hydroxytryptamine the values are 180 microM and 140 microM, respectively. In the rat brain, mixed ...
Guffroy C - - 1983
n-Pentylamine is deaminated by homogenates of rat heart. Clorgyline inhibition curves at 10 and 100 microM n-pentylamine indicated that this substrate was deaminated by MAO-A, -B and a clorgyline-resistant amine oxidase sensitive to inhibition by semicarbazide. These results have been compared with two other commonly used monoamine substrates, beta-phenethylamine and ...
Ashkenazi R - - 1983
The administration of 4-[2-(3-indolyl)ethyl]piperidine (LM 5008), a selective 5-hydroxytryptamine (5-HT) uptake blocker to rats pretreated with tranylcypromine (Tcp) resulted in a behavioural syndrome of locomotor hyperactivity which is indistinguishable from that following combined treatment with Tcp and L-tryptophan. A similar behavioural response was elicited by the administration of LM 5008 ...
Clemens J A - - 1983
Semidifferentiated voltammograms were recorded using graphite paste electrodes in the striatum of the anesthetized and unanesthetized rat treated with the dopamine agonist, pergolide. The first peak in the voltammogram, which represents mainly ascorbic acid (AA) and lesser amounts of dopamine and 3, -4-dihydroxyphenylacetic acid, was decreased in the anesthetized rat ...
Gervas J J - - 1983
We studied the effects of 3-methoxy, 4-hydroxy-phenylalanine (3-OM-dopa) on monoamine turnover, L-3-4-dihydroxy-phenylalanine (L-dopa) reversal of catecholamine depletion induced by alpha-methyl-paratyrosine (alpha-MT), and the passage of L-dopa across the blood-brain barrier of the rat brain. 3-OM-dopa did not affect monoamine turnover but interfered with restoration of dopamine levels by L-dopa. In ...
Perin A - - 1983
Polyamine levels and diamine oxidase (EC 1.4.3.6) activity were studied in hypertrophic heart of spontaneously hypertensive rats as well as in the heart of Wistar rats during the development and regression of cardiac hypertrophy induced by isoproterenol administration. In spontaneously hypertensive rats, putrescine content and diamine oxidase activity were higher ...
Holzbauer M - - 1983
MAO activity was tested in four organs of young male rats 16 days after hypophysectomy. Five monoamines were used as substrates. In the adrenal glands and the thyroid gland MAO activity towards the substrates preferably deaminated by MAO-A was severely decreased. In the adrenal glands, but not in the thyroid ...
Dyck L E - - 1983
Slices of striatal tissue obtained from saline-injected rats were incubated with 3H-phenylalanine in the presence of pargyline. This resulted in the formation of 3H-m-tyramine, 3H-p-tyramine, and 3H-phenylethylamine. Pretreatment of the rats with alpha-methyl-p-tyrosine reduced the formation of 3H-m-tyramine and 3H-p-tyramine, but enhanced the formation of 3H-phenylethylamine. After incubation of striatal ...
Oreland L - - 1983
It was found that in the rat striatum DA was oxidized extrasynaptosomally to 11% by MAO-A and to 3% by MAO-B. The corresponding intrasynaptosomal oxidations were 84% and 2%, respectively. Those figures were virtually unchanged even if the rat brain MAO-B was selectively inhibited to 87% by deprenyl. In the ...
Murthy M S - - 1983
Sodium glycolate feeding (50 mg/100 g body weight/day) to adult male rats for 7 days resulted in increased activities of glycolate oxidase in liver and lactate dehydrogenase in liver and kidney. However, the activity of glycolate dehydrogenase decreased both in liver and kidney. Treatment of sodium pyruvate (100 mg/100 g ...
Banerji T K - - 1982
The therapeutic usefulness of lithium in mania is now well-established. However, the precise neurochemical mechanisms by which lithium brings about its effects remain poorly understood. This report describes the effects of lithium on the central and peripheral levels of activity of dopamine-beta-hydroxylase (DBH), the enzyme that catalyzes the final step ...
Lindén I B - - 1982
In the rat, 3,4-dihydroxyphenylpyruvic acid (DHPPA) was shown to be transaminated to L-dopa when administered orally concomitantly with L-[3H]dopa. As much as 40% of the serum L-dopa and brain dopamine was shown to be formed via transamination. Moreover, it was shown that DHPPA also caused a so-called L-dopa-sparing effect, i.e. ...
Jarausch J - - 1982
With a high-resolving dodecyl sulfate electrophoretic system rat liver cytochrome c oxidase was separated into 13 different polypeptides. An antiserum against rat liver holocytochrome c oxidase immunoreacted with all 13 polypeptides, as demonstrated by immunofluorescence after transfer of the separated Coomassie blue-stained bands on nitrocellulose and coupling with FITC-protein A ...
Wielburski A - - 1982
1. The assembly of rat liver cytochrome oxidase was studied in isolated hepatocytes and isolated liver mitochondria labelled with L-[35S]methionine. 2. Labelled subunits II and III appeared in the immunoabsorbed holoenzyme within minutes after the initiation of a pulse label. In contrast, labelled subunit I appeared in immunoabsorbed holoenzyme only ...
Ask A L - - 1982
The inhibitory effects on monoamine oxidase (MAO) of some dimethylamino-alpha-phenylalkylamine derivatives were examined in a rat brain mitochondrial preparation in vitro and in rat brain slices following oral administration. In the in vitro assay the compounds were shown to be selective inhibitors of the A form of MAO, being 100-600 ...
Iwaki K - - 1982
The hyperuricemic effect of cholinergic agents was studied in rats given potassium oxonate which inhibits urate oxidase and in functionally hepatectomized rats. Acetylcholine slightly increased plasma uric acid in the oxonate-treated animals, and the effect was markedly enhanced by pretreatment with physostigmine. Carbachol alone showed the hyperuricemic effect at a ...
Egashira T - - 1982
A and B-form monoamine oxidase (MAO) activities were measured in the liver of rats maintained with a diet containing 0.06% 3'-methyl-4-dimethylaminoazobenzene (3'-Me-DAB). A-form MAO activity was similar to the control value throughout the feeding periods with serotonin as substrate. In contrast, B-form MAO activity decreased rapidly and the level of ...
Egashira T - - 1982
Effects of 3'-Me-DAB on MAO in rat liver mitochondria, in vitro, were investigated. 3'-Me-DAB at a concentration of 1 x 10(-5) M inhibits MAO activity about 40%, and this inhibition recovered to the control value after dialysis overnight against 0.001 M phosphate buffer. MAO activity was inhibited in an apparently ...
Atkinson R K - - 1982
Strong evidence has been obtained that the funnel-web spider venom inhibitor, previously found to occur naturally in the blood of rats, is at least partly immunoglobulin in composition. However, the results of chromatographic and immunological studies, including the use of specific antisera, indicate that this inhibitor is not a single ...
< 1 2 3 4 5 6 7 8 9 10 11 >