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  • 1995-1999  (5)
  • 1905-1909
  • Chemistry  (2)
  • Myenteric plexus  (2)
  • Chronisch lymphatische Leukämie  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 351 (1995), S. 229-236 
    ISSN: 1432-1912
    Keywords: Key words BIMU 8 ; BIMU 1 ; Renzapride ; 5-HT4 receptors ; Acetylcholine release ; Myenteric plexus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The effects of the 5-HT4 receptor agonists BIMU 8, BIMU 1, renzapride and of the 5-HT1p receptor agonist 5-hydroxyindalpine on basal and electrically evoked outflow of tritium were studied in guinea-pig longitudinal muscle myenteric plexus preparations preincubated with [3H]choline. Muscle contractions were recorded simultaneously. BIMU 8 caused a calcium dependent and tetrodotoxin sensitive increase in basal [3H]outflow that was assumed to represent release of [3H]acetylcholine. In addition, BIMU 8 enhanced the release of [3H]acetylcholine and twitch contractions evoked by submaximal electrical stimulation. Ondansetron (1 μmol/l) did not change the effects of BIMU 8, but DAU 6285 and tropisetron (each 1 μmol/l) competitively antagonized the various facilitatory effects of BIMU 8 with pA2 values of 7.0–7.2 (DAU 6285) and 7.0–7.3 (tropisetron). The phosphodiesterase inhibitors IBMX and rolipram did not increase the effects of BIMU 8. BIMU 1 and renzapride also concentration-dependently increased basal release of acetylcholine, and release and contractions caused by submaximal stimulation. The effects of BIMU 1 and renzapride were competitively antagonized by 1 μmol/l tropisetron (pA2 6.6–7.1). The EC50 values for the increase in the evoked [3H]acetylcholine release and contractions were closely similar. 5-Hydroxyindalpine did not change basal release and slightly inhibited the evoked release of [3H]acetylcholine. Release of acetylcholine and contractions elicited by submaximal stimulation were strongly inhibited by (+)-tubocurarine which indicates that nicotinic ganglionic transmission is involved in this kind of release. The results suggest that BIMU 8, BIMU 1 and renzapride stimulate 5-HT4 receptors at cholinergic interneurones and thereby facilitate nicotinic ganglionic transmission in the myenteric plexus. Cyclic AMP is probably not involved in the 5-HT4 receptor mediated facilitation of acetylcholine release.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Polymerase-Kettenreaktion ; Chronisch lymphatische Leukämie ; Monoklonalität ; Leptomeningeale Infiltration ; Key words Polymerase chain reaction ; Chronic lymphatic leukemia ; Monoclonality ; Leptomeningeal infiltration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The diagnosis of leptomeningeal dissemination of chronic lymphatic leukemia (CLL) by conventional cytology is unreliable because cytomorphologic criteria of malignancy are often lacking. Immunophenotyping of leukocyte differentiation antigens may also be of limited diagnostic value due to the small number of cells in cerebrospinal fluid (CSF) samples. Molecular methods may support the specific diagnosis of leptomeningeal infiltration of CLL. We present an 54 old patient who was diagnosed with CLL five years ago. Despite clinical signs of leptomeningeal involvement neither magnetic resonance imaging (MRI) nor conventional CSF analysis were suggestive of lymphomatous meningitis. Using PCR we selectively amplified the highly variable and clone-specific CDR3 region of the locus encoding the immunoglobulin heavy chain (IgH) in DNA obtained from both CSF and peripheral blood cells. Analysis of PCR products by high resolution gel electrophoresis revealed a single DNA fragment respectively indicating the presence of a monoclonal cell population in both compartments. DNA sequence analysis of the amplified CDR3 segments confirmed the clonal identity of cells and the leptomeningeal dissemination of CLL.
    Notes: Zusammenfassung Die Diagnose einer leptomeningealen Infiltration ist bei der chronisch lymphatischen Leukämie (CLL) mit konventionellen zytomorphologischen Methoden nicht hinreichend möglich. Das Zellbild ist meist monomorph, und eindeutige Malignitätskriterien fehlen. Eine Immunphänotypisierung mit Bestimmung von Leukozytendifferenzierungsantigenen erlaubt eine weitere Eingrenzung, ist jedoch häufig wegen geringen Zellmaterials nur eingeschränkt möglich. Molekulargenetische Methoden können zur weiteren Diagnosesicherung eingesetzt werden. Bei einem 54jährigen Patienten mit einer seit 5 Jahren bestehenden Diagnose einer CLL konnte trotz klinischen Verdachts weder kernspintomographisch noch in der konventionellen Liquordiagnostik ein Anhalt für eine leptomeningeale Infiltration der CLL gefunden werden. Mit der Polymerase-Kettenreaktion (PCR) wurde die hochvariable, B-Zell-Klon-spezifische CDR3-Region des für die Immunglobulinkette-Schwerkette (IgH) kodierenden Locus selektiv amplifiziert. Als Ausgangsmaterial wurde zelluläre DNA aus Liquor und Blut des Patienten verwendet. Die Analyse der PCR-Produkte mit hochauflösender Gelelektrophorese ergab sowohl für B-Zellen aus dem Liquor als auch für B-Zellen aus dem Blut ein einzelnes DNA-Fragment. Hierdurch wurde der Nachweis erbracht, daß die Zellpopulationen in beiden Kompartimenten monoklonal sind. Die DNA-Sequenz-Analyse der amplifizierten CDR3-Segmente bestätigte die klonale Identität der Zellen und damit eindeutig die leptomeningeale Infiltration der CLL.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 351 (1995), S. 229-236 
    ISSN: 1432-1912
    Keywords: BIMU 8 ; BIMU 1 ; Renzapride ; 5-HT4 receptors ; Acetylcholine release ; Myenteric plexus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of the 5-HT4 receptor agonists BIMU 8, BIMU 1, renzapride and of the 5-HT1p receptor agonist 5-hydroxyindalpine on basal and electrically evoked outflow of tritium were studied in guinea-pig longitudinal muscle myenteric plexus preparations preincubated with [3H]choline. Muscle contractions were recorded simultaneously. BIMU 8 caused a calcium dependent and tetrodotoxin sensitive increase in basal [3H]outflow that was assumed to represent release of [3H]acetylcholine. In addition, BIMU 8 enhanced the release of [3H]acetylcholine and twitch contractions evoked by submaximal electrical stimulation. Ondansetron (1 μmol/l) did not change the effects of BIMU 8, but DAU 6285 and tropisetron (each 1 μmol/l) competitively antagonized the various facilitatory effects of BIMU 8 with pA2 values of 7.0–7.2 (DAU 6285) and 7.0–7.3 (tropisetron). The phosphodiesterase inhibitors IBMX and rolipram did not increase the effects of BIMU 8. BIMU 1 and renzapride also concentration-dependently increased basal release of acetylcholine, and release and contractions caused by submaximal stimulation. The effects of BIMU 1 and renzapride were competitively antagonized by 1 μmol/l tropisetron (pA2 6.6–7.1). The EC50 values for the increase in the evoked [3H]acetylcholine release and contractions were closely similar. 5-Hydroxyindalpine did not change basal release and slightly inhibited the evoked release of [3H]acetylcholine. Release of acetylcholine and contractions elicited by submaximal stimulation were strongly inhibited by ( + )-tubocurarine which indicates that nicotinic ganglionic transmission is involved in this kind of release. The results suggest that BIMU 8, BIMU 1 and renzapride stimulate 5-HT4 receptors at cholinergic interneurones and thereby facilitate nicotinic ganglionic transmission in the myenteric plexus. Cyclic AMP is probably not involved in the 5-HT4 receptor mediated facilitation of acetylcholine release.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1170-1171 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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