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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 26 (1976), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Particulate fractions from rat brain homogenate containing the synaptosomes synthesize and release prostaglandins F and E on aerobic incubation. The prostaglandin of the F-typc released could be further identified as proslaglandin F2α using specific radioimmunoassays for prostaglandins F1α, and F2α-. The metabolite 13,14-dihydro-15-keto-prostaglandin F2α could not be detected. The amount of prostaglandins released is dependent on incubation time and temperature as well as pH and osmolarity of the incubation medium. Total brain homogenate released more prostaglandins than purified synaptosomes per mg protein, indicating that synaptosomes are probably not a main source of prostaglandins when compared with other subcellular brain fractions. While prostaglandin synthesis was only moderately increased by the addition of the precursor fatty acid arachidonic acid, anti-inflammatory drugs like indomethacin, high concentrations of some local anaesthetics and Δ1-tetrahydrocannabinol inhibited prostaglandin release. The neurotransmitters noradrenaline, dopamine and 5-hydroxytryptamine did not influence prostaglandin release from the synaptosomal rat brain fractions.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 632 (1991), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: The present findings have revealed a new aspect of how mechanisms of gastric mucosal resistance to injury are called into effect and are coordinated by the nervous system. Capsaicin-sensitive sensory neurons in the stomach play a physiological role in monitoring acid influx into the superficial mucosa. Once activated, they strengthen gastric mucosal defense against deep injury, with a key process in this respect being an increase in blood flow through the gastric mucosa. This concept opens up completely new perspectives in the physiology and pathophysiology of the gastric mucosa if we consider that the long-term integrity of the gastric mucosa may be under the subtle control of acid-sensitive sensory neurons and that, vice versa, improper functioning of these neural control mechanisms may predispose to gastric ulcer disease.The present observations also indicate that some of the peptides contained in gastric sensory nerve endings might fulfill a transmitter or mediator role in controlling gastric mucosal blood flow and integrity. Whereas substance P and neurokinin A are unlikely to play a role in the regulation of gastric mucosal blood flow, there is severalfold evidence that CGRP is very important in this respect. This peptide, which in the rat gastric mucosa originates exclusively from spinal sensory neurons,2,4,27 is released upon stimulation of sensory nerve endings and is extremely potent in facilitating gastric mucosal blood flow and in protecting the mucosa from injurious factors. Selective ablation of spinal sensory neurons containing CGRP weakens the resistance of the gastric mucosa against acid injury, which is most likely due to inhibition of protective vasodilator reflexes. We now aim at providing direct pharmacological evidence that antagonism of endogenously released CGRP results in similar pathophysiological consequences as ablation of capsaicin-sensitive sensory neurons.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 261-263 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 shows that phagocytosis of antibody-coated ery-throcytes (EA) triggered release of mainly immunoactive PGE2 but also of measurable amounts of thromboxane B2 (TXB2) (and PGF2a, not shown). Of the compounds tested which modulate PG and TX release from phagocytosing mouse peritoneal ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1420-9071
    Keywords: Aspirin-like drugs ; flurbiprofen enantiomers ; anti-inflammatory ; analgesic ; gastrointestinal toxicity ; prostaglandin synthesis ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using flurbiprofen, a chiral anti-inflammatory and analgesic 2-arylpropionic acid derivative, the enantiomers of which are not converted to each other (less than 5%) in rats or man, we obtained evidence that prostaglandin synthesis inhibition is primarily mediating the anti-inflammatory activity but prostaglandin synthesis independent mechanisms contribute to the analgesic effects. Thus, the S-form inhibited prostaglandin synthesis, inflammation and nociception in rats. The R-form had much less effect on prostaglandin synthesis and did not affect inflammation. It did, however, block nociception in rats almost as potently as the S-form. S-flurbiprofen, in contrast to the R-form, was clearly ulcerogenic in the gastrointestinal mucosa. These results indicate additional molecular mechanisms of analgesia and suggest the use of R-arylpropionic acids as analgesics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 32 (1976), S. 1114-1115 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using radio-immuno assays for prostaglandins and prostaglandin metabolites, three prostaglandin metabolizing enzymes were found in the 100,000×g supernatant of rat brain, 15-hydroxy-prostaglandin-dehydrogenase,Δ 13 and prostaglandin E-9-keto-reductase. Specific activity of the latter enzyme was highest in striatum and midbrain and lowest in cortex, cerebellum and spinal cord.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1912
    Keywords: Anaphylaxis ; Catecholamines ; Prostaglandins ; Slow-Reacting Substance ; Histamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In sensitized perfused guinea pig lungs antigen (ovalbumin) released prostaglandins (Pgs) F2α and E2, slow-reacting substance of anaphylaxis (SRS-A), and histamine. Furthermore, high amounts of the metabolite 15-keto-13,14-dihydro-PgF2α were found. Accordingly, perfusion of nonsensitized lungs with PgF2α and E2 resulted in extensive destruction of both substances. Simultaneously with the mediator release, very intense bronchospasm and pulmonary vascular constriction occurred. Administration of histamine in nonsensitized lungs resulted in Pg release. Isoproterenol as well as adrenaline prevented the anaphylactic mediator release, and concemitantly inhibited the spastic effects in the lungs. Propranolol reversed these actions of the catecholamines. Also indomethacin abolished the prostaglandin release, but increased the liberation of SRS-A. The findings are discussed in view of the contraregulatory function of adrenaline in anaphylaxis.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1912
    Keywords: Cardiac anaphylaxis ; Nitric oxide ; 3-Morpholinosydnonimine (SIN-1) ; NG-nitro-l-argi-nine (NNA) ; Eicosanoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The modulating effects of exogenous and endogenous nitric oxide (NO) on the cardiac anaphylactic reaction and eicosanoid release were investigated in isolated perfused sensitized guinea-pig hearts using 3-morpholinosydnonimine (SIN-1), the active metabolite of molsidomine, as NO-donor and NG-nitro-l-arginine (NNA) as an inhibitor of NO biosynthesis. Infusion of SIN-1 (final concentrations in the perfusates 0.3 or 1.0 mmol/l) elevated coronary flow under basal conditions as well as during cardiac anaphylaxis, while NNA (0.1 mmol/l) decreased basal coronary flow and aggravated the anaphylactic coronary constriction. Both drugs did not modify the characteristic biphasic profile of the coronary constriction after antigen challenge with an initial more severe phase followed by a less pronounced long-lasting flow reduction. Neither SIN-1 nor NNA affected spontaneous heart rate. However, while NNA tended to prolong the duration of antigen-induced arrhythmias, SIN-1 (1 mmol/l) had an inhibitory effect. This protection might be related to the increased coronary flow in the presence of SIN-1. SIN-1 inhibited anaphylactic release of cysteinyl-leukotrienes (LT) and 6-keto-prostaglandin (PG) F1α, but did not influence thromboxane (TX) B2 release. On the other hand, NNA (0.1 mmol/l) inhibited anaphylactic release of TXB2, but had only marginal effects on the release of cysteinyl-LT and 6-keto-PGF1α. The results suggest that exogenous and endogenous NO functionally antagonize the effects of vasoconstrictor mediators released after antigen challenge. Additional effects of high concentrations of SIN-1 and NNA on antigen-induced eicosanoid release could modulate the vascular actions of these drugs during cardiac anaphylaxis.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 355 (1997), S. 224-229 
    ISSN: 1432-1912
    Keywords: Key words Cardiac anaphylaxis ; Isolated perfused guinea-pig heart ; Eicosanoids ; Histamine ; Calcitonin gene-related peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have investigated the antigen-stimulated release of calcitonin gene-related peptide (CGRP) from ovalbumin-sensitized guinea-pig isolated hearts and the interaction with other mediators of anaphylaxis released concomitantly. It was found that antigen challenge caused a significant increase of CGRP release (from basal 31.2 ± 2.9 to 51.6 ± 4.9 fmol/5 min). Anaphylactic CGRP release was significantly attenuated in the presence of the cyclooxygenase inhibitor indomethacin while the 5-lipoxygenase inhibitor Bay-X1005 ((R)-2-[4-quinolin-2-yl-methoxy)phenyl]-2-cyclopentyl acetic acid) had no significant effect. Combined treatment with the histamine receptor (H1,H2) antagonists mepyramine and cimetidine also significantly attenuated anaphylactic release of CGRP. Under control conditions antigen injection increased release of cysteinyl-leukotrienes (LT), thromboxane (TXB2) and 6-keto-prostaglandin (PG)F1α from basal values of 0.96 ± 0.09, 2.7 ± 0.7 and 3.4 ± 0.28 ng/5 min respectively, to 5.9 ± 0.9, 48.4 ± 3.4 and 6.9 ± 1.4 ng/5 min. Indomethacin abolished the release of cyclooxygenase products of arachidonate metabolism and simultaneously increased cysteinyl-LT release significantly (8.8 ± 1.4 ng/5 min). Conversely Bay-X1005 completely abolished cysteinyl-LT release and had no significant effect on anaphylactic release of TXB2 and 6-keto-PGF1α. Simultaneous blockade of H1 and H2 receptors abolished release of 6-keto-PGF1α, while release of TXB2 and cysteinyl-LT was not significantly affected. The results indicate that CGRP is not a primary mediator of the immediate hypersensitivity reaction of the heart, but is in turn released by arachidonic acid metabolites of the cyclooxygenase pathway and histamine. In contrast, LT obviously do not contribute to anaphylactic CGRP release. CGRP is a potent coronary vasodilator and could act as endogenous functional antagonist of vasoconstrictor mediators also released during cardiac anaphylaxis such as cysteinyl-LT, platelet activating factor and TXA2.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 296 (1977), S. 131-137 
    ISSN: 1432-1912
    Keywords: Glucocorticoids ; PGE release ; Cyclic AMP levels ; Glycosaminoglycan synthesis ; Fibroblast cultures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Glucocorticoids (GCs) reduced cyclic AMP levels and inhibited glycosaminoglycan (GAG) synthesis in secondary embryonic mouse fibroblast cultures, when cells were incubated for short periods (30 min). The order of potency was dexamethasone 〉 prednisolone 〉 hydrocortisone. The effect was more marked, when cyclic AMP levels and GAG synthesis were increased by addition of PGE1. Glucocorticoids exerted no longer an inhibitory effect on cyclic AMP and GAG synthesis in cultures pretreated for 48 h with the steroids. Addition of PGE1 caused a stronger rise in cyclic AMP and GAG synthesis than in controls without GC-preincubation. This enhancement was even more pronounced, when PGE1 was added together with the GCs. The reversal of the inhibitory effect of the GCs into a potentiating effect following preincubation correlated to a reduction of endogenous PGE formation in the cultures. Short-term treatment with GCs did not reduce endogenous PGE levels, but prolonged incubation markedly decreased PGE levels. PGE formation recovered following addition of fresh medium after the 48 h incubation with the steroids, but the amount of PGE formed remained significantly lower than in untreated cultures. Non-glucocorticoid steroid hormones did not decrease PGE levels. The results indicate that the apparent loss of inhibitory activity of GCs on cyclic AMP and GAG synthesis observed after prolonged incubation may result from a reduction of endogenous PGE formation which renders the cells more sensitive to the stimulatory effect of exogenous PGE1.
    Type of Medium: Electronic Resource
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