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  • Insulinoma  (2)
  • Lung  (2)
  • Pancreatic secretion  (2)
  • 1
    ISSN: 0014-5793
    Keywords: Covalent cross-linking ; GLP-I(7-36)amide ; Lung ; Receptor
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    FEBS Letters 267 (1990), S. 78-80 
    ISSN: 0014-5793
    Keywords: Adenylate cyclase ; GLP-1(7-36)amide ; Guanine nuclcotide ; Lung ; Receptor
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Cholecystokinin ; Gastrointestinal hormones ; Human ; Interdigestive pattern ; Fed pattern ; Pancreatic secretion ; Neurotensin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of the present study was to assess the role of cholecystokinin and neurotensin in converting the cyclical interdigestive pattern of pancreatic secretion into the non-cyclical fed pattern. Six healthy male volunteers were studied on 4 separate days. During each experiment a mixed liquid meal or solutions of individual nutrients were perfused intraduodenally for 180 min at 2 ml/min. The mixed meal contained 4.3 g glucose, 2.0 g fractionated soya oil, and 1.7 g casein hydrolysate per 100 ml, which delivered a caloric load of 0.9 kcal/min into the duodenum. The isocaloric and isotonic solutions of individual nutrients contained 44.5 g glucose, 17.8 g fractionated soya oil, or 44.5 g hydrolysed serum bovine albumin per liter and delivered 0.36 kcal/min into the duodenum. Duodenal aspirates and blood samples were collected at regular intervals for determination of pancreatic enzyme outputs and plasma levels of cholecystokinin and neurotensin, respectively. The mixed meal converted the cyclical interdigestive secretory pattern into the noncyclical fed pattern whereas none of the three individual nutrients abolished the interdigestive pattern. Not only the mixed meal but also lipid and protein perfusion consistently stimulated cholecystokinin release. Integrated incremental cholecystokinin release amounted to 32.3±9.9 pg/ml × 180 min with the mixed meal, 23.2±6.5 with lipid perfusion (P〈 0.05 versus mixed meal) and 13.4±3.8 with protein perfusion (P〈0.05 versus mixed meal). The carbohydrate solution did not significantly release cholecystokinin. None of the duodenal perfusates raised neurotensin plasma levels. We conclude that (a) intraduodenal delivery of a mixed meal at 0.9 kcal/min converts the interdigestive pattern of pancreatic secretion, (b) cholecystokinin but not neurotensin is involved in converting this pattern in response to low-caloric meals, and (c) a threshold amount of CCK release must be exceeded to convert the secretory pattern.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1440
    Keywords: Pancreatic secretion ; Intracellular transport ; Proteinase inhibitor ; Two-dimensional gel electrophoresis ; FOY-305
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The guanidino acid esters (FOY, FOY-305) represent a new class of potent proteinase inhibitors and are thought to have a beneficial effect on the course of acute pancreatitis. Because of their structure and low molecular size they might enter cells and interfere with cellular processes. To test this possibility in the case of the exocrine pancreas a series of in vivo and in vitro studies was carried out to analyse intracellular transport and discharge of pancreatic enzymes in the presence of FOY-305. The infusion of FOY-305 to conscious rats led to a transient inhibition of protein and enzyme discharge from the cannulated pancreas accompanied by lower serum enzyme levels and increased enzyme content in the pancreas. An identical inhibition of discharge of newly synthesized proteins was observed in vitro in the presence of 1 µM FOY-305. The analysis of the release of individual enzymes using separation on two-dimensional gels showed a pronounced inhibition of mainly the release of acidic proteins. FOY-305 not only interfered with discharge of serine proteinases (trypsinogen, chymotrypsinogen, proelastase) but also with procarboxypeptidases and lipase. It was concluded that FOY-305 enters the acinar cell and due to an unspecific binding to acidic proteins interferes with the intracellular transport of individual enzyme proteins during their passage through the membrane-bound cellular compartments. This charge-dependent effect is independent of the inhibitory effect on enzymatic activity of serine proteinases.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 8 (1972), S. 250-259 
    ISSN: 1432-0428
    Keywords: Insulinoma ; immunohistologic investigation of B-cell tumours ; peroxidase labelled antibodies ; insulin and C-peptide in B-cells ; insulin concentration of insulinomas ; difference between insulin in normal and tumour B-cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé 14 insulinomes ont été soumis à un examen immunohistologique à l'aide de la méthode de l'anticorps marqué à la peroxydase. 8 tumeurs ont été étudiées immédiatement après leur extirpation. 7 d'entre elles réagissaient avec les sérums anti-insuline et anti-porcine-C-peptide, mais non avec le sérum anti-glucagon. Un seul carcinome à cellules B avec un contenu en insuline inhabituellement bas, a été négatif. Un an après l'inclusion dans la paraffine, la réaction immunohistologique avec le sérum anti-insuline avait nettement diminué dans les tumeurs, mais non dans les îlots du pancréas adjacent. Chez 6 patients, on disposait de fragments de la tumeur et du pancréas normal inclus dans la paraffine depuis 1 à 4 ans. Dans ce groupe, 4 tumeurs avec un contenu élevé en insuline, n'avaient qu'une faible réaction immunohistologique avec un sérum antiinsuline, et deux tumeurs (l'une avec un contenu élevé en insuline, l'autre avec un contenu faible) ont eu une réaction immunohistologique négative, tandis que les îlots du pancréas adjacent réagissaient fortement dans les six cas. Donc, la réaction immunohistologique de l'insuline dans les tumeurs à cellules B, mais non dans les îlots normaux, dépend du temps écoulé entre l'inclusion dans la paraffine et le moment où elles sont examinées. Seules les tumeurs fixées dans du liquide de Bouin, mais non dans la solution de Karnovsky, ont eu une réaction immunohistologique positive, tandis que les îlots du pancréas adjacent réagissaient positivement après fixation dans la solution de Karnovsky. Ces résultats suggèrent qu'il existe des différences entre l'insuline du pancréas normal et l'insuline des tumeurs. Une comparaison entre la coloration à l'aldéhyde-thionine et l'immunohistologie indique la supériorité de l'immunohistologie dans l'identification des cellules tumorales produisant de l'insuline.
    Abstract: Zusammenfassung 14 insulinproduzierende Tumoren wurden mittels Peroxydase-markierter Antikörper immunhistologisch untersucht. 8 Tumoren gelangten unmittelbar postoperativ zur Untersuchung. Hiervon ließen sich 7 mit einem Antiserum gegen Insulin und Schweine-C-Peptid, nicht aber mit einem Antiserum gegen Glucagon anfärben. Dagegen reagierte ein B-Zellcarcinom mit einer sehr niedrigen Insulinkonzentration mit keinem dieser Seren. Bereits ein Jahr nach der Einbettung in Paraffin ließ die Anfärbbarkeit dieser Tumoren mit einem Antiinsulinserum deutlich nach, während die Inseln des umgebenden normalen Pankreas mit dem gleichen Serum unverändert stark reagierten. — Von 6 weiteren Inseladenomen standen außerdem 1– 4 Jahre altes paraffineingebettetes Tumor- und Pankreasgewebe zur Verfügung. 4 dieser Tumoren hatten eine erhöhte Insulinkonzentration, reagierten immunhistologisch jedoch mit einem Antiinsulinserum nur schwach. Die beiden restlichen Tumoren — einer mit einer hohen, der andere mit einer niedrigen Insulinkonzentration — verhielten sich immunhistologisch negativ. Im Gegensatz zu den Tumoren ließen sich die Inseln des umgebenden Pankreas sämtlicher 6 Fälle mit einem Insulinantiserum gut anfärben. Somit scheint der erfolgreiche immunhistologische Nachweis von Insulin in insulinproduzierenden Tumoren von der Dauer der Einbettung des Tumormaterials in Paraffin abzuhängen. Das Insulin in den Pankreasinseln unterliegt dagegen diesem „Alterungseffekt“ nicht. — TumorInsulin läßt sich nur in Bouin-fixiertem, nicht aber in Karnovsky-fixiertem Gewebe immunhistologisch nachweisen, während das Insulin des normalen Pankreas auch nach Karnovsky-Fixation immunhistologisch nachweisbar ist. Die Befunde sprechen für Unterschiede zwischen normalem pankreatischen und Tumor-Insulin. — Die Färbung der B-Zellen von Tumoren mit Aldehyd-Thionin gelingt seltener als der immunhistologische Nachweis von Insulin in diesen Zellen. Die immunhistologische Untersuchung ist daher zur Identifizierung von B-Zelltumoren den üblichen spezifischen Färbungen überlegen.
    Notes: Summary 14 insulinomas were examined immunohistologically using the peroxidase labelled antibody method. 8 tumours were investigated immediately after extirpation. 7 of these reacted with insulin and porcine-C-peptide antisera but not with glucagon antiserum. Only a B-cell carcinoma with an unusually low insulin concentration was negative. One year after embedding in paraffin the immunohistologic reaction with insulin antiserum had markedly decreased in the tumours; however, not in the islet of the adjacent pancreas. From 6 patients 1 to 4 years old paraffin-embedded material of the tumour and the normal pancreas was available. In this group 4 tumours with an elevated insulin concentration reacted immunohistologically only weakly with an insulin antiserum and two tumours (one with high and one with low insulin concentration were immunohistologically negative, while the islets of the adjacent panceas of all six cases showed a strong reaction. Thus the immunohistilogic reaction of insulin in B-cell tumours but not in normal islets depends on the time elapsed between the paraffin embedding and the examination. Only tumours fixed in Bouin's fluid but not in Karnovsky's solution gave a positive immunohistologie reaction, while the islets of the adjacent pancreas reacted positively also after fixation in Karnovsky's solution. These findings suggest differences between the normal and the tumour insulin. A correlation between aldehyde-thionin stain and immunohistology indicates the superiority of immunohistology in identifying insulin producing tumour cells.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0428
    Keywords: Insulinoma ; IRI content of insulinoma ; ultrastructural categorization of insulinomas ; proinsulin content of insulinomas ; functional defect in insulinomas reduced storage capacity of insulinoma cells ; non-granular insulin release ; proinsulin content of human pancreas ; diazoxide response of insulinomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty human insulinomas have been investigated histologically and their immunoreactive insulin (IRI) content estimated. In most cases immunohistological and ultrastructural studies were also performed and the percentage of proinsulin-like components (PLC) in the tumour determined. Except for 1 case the IRI concentration in the tumours was lower (0.01–89.0 U/g) than in the islet tissue. Histologically, immunohistologically and ultrastructurally a variable number of tumour cells contained few and often no beta-granules, indicating a decreased storage capacity for insulin. This defective storage capacity seems to be the major functional abnormality of insulinoma cells. Ultrastructurally four types of insulinoma can be distinguished. The ultra-structural diagnosis of an insulinoma can only be made in type I (typical beta-granules, 13 cases) and type II (typical and atypical granules, 7 cases) but not in type III (atypical granules only, 4 cases) and type IV (virtually agranular, 4 cases). The type IV tumours had the lowest IRI concentration and did not respond to diazoxide treatment. The IRI concentration of the uninvolved pancreas of 19 patients was 2.0±0.2 U/g and in the range of non-diabetic adults. — The percentage PLC in 19 insulinomas was higher (5.3–22%) than in the pancreas of human adults with and without insulinoma (1.7–4.8%). The percentage of PLC in the serum of patients with insulinoma was always higher than in their tumours (33–61%). It is suggested that the higher PLC levels found in the tumour and serum of insulinoma patients are the consequence of the reduced storage capacity of the tumour cells resulting in a rapid passage through the granular route or even a non-granular release of newly synthesized insulin.
    Type of Medium: Electronic Resource
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