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  • 1
    ISSN: 1432-0428
    Keywords: Diabetic embryopathy ; myo-inositol ; prostaglandins ; neural tube ; mouse embryos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neural tube defects in infants of diabetic mothers constitute an important and frequent cause of neonatal mortality/morbidity and long-term chronic handicaps. The mechanism by which normal neural tube fusion occurs is not known. The failure of rostral neural tube fusion seen in mouse embryos incubated in the presence of excess-D-glucose can be significantly prevented by the supplementation of myo-inositol to the culture medium. This protective effect of myo-inositol is reversed by indomethacin, an inhibitor of arachidonic acid metabolism leading to prostaglandin synthesis. Prostaglandin E2 added to the culture medium completely protects against the glucose-induced neural tube defect. These data suggest that the failure of neural tube fusion seen in diabetic embryopathy is mediated through a mechanism involving abnormalities in both the myo-inositol and arachidonic acid pathways, resulting in a functional deficiency of prostaglandins at a critical time of neural tube fusion.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0568
    Keywords: Neurosecretion ; Adrenalectomy ; Diabetes insipidus ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of adrenalectomy on the amount of “Gomori-positive” neurosecretory material in the outer layer of the median eminence and in the supraoptico-hypophysial system was studied in normal Long-Evans rats and in Long-Evans rats heterozygous and homozygous for hypothalamic diabetes insipidus. In all non-adrenalectomized rats very few “Gomori-positive” granules were found in the outer median eminence layer. After adrenalectomy the amount of the granules increased markedly in normal Long-Evans rats and only slightly in Long-Evans rats heterozygous for diabetes insipidus. However, no augmentation of the granules occurred in homozygous diabetes insipidus rats. The amount of “Gomori-positive” substances demonstrable in the supraoptic and paraventricular nuclei, in the inner layer of the median eminence, and in the neural lobe of the hypophysis was less in rats heterozygous for diabetes insipidus than in normal Long-Evans rats and the smallest in homozygous diabetes insipidus rats. No differences in the amounts of the substances were observed between adrenalectomized and non-adrenalectomized animals. The findings suggest that the “Gomori-positive” granules occurring in the outer layer of the median eminence of adrenalectomized rats are of similar origin as those of the supraoptico-hypophysial system and represent a vasopressin-neurophysin-complex. The results support the concept that vasopressin is involved in the regulation of ACTH release.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 46 (1968), S. 47-49 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The biological half-time of labeled aldosterone of 30 to 40 minutes in normal man was 15, 19 and 20 minutes in three nephrectomized patients.
    Notes: Zusammenfassung Die biologische Halbwertszeit von Aldosteron, die normalerweise 30–40 min beträgt, war bei drei nephrektomierten Patienten auf 15, 19 und 20 min verkürzt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 46 (1968), S. 18-21 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 18-aldosterone glucuronide and tetrahydroaldosterone glucuronide were isolated from human urine by ether-ethanol extraction, column chromatography on alumina and paper chromatography with two different solvent systems. The yields were nearly 50% for 18-aldosterone glucuronide and 80% for tetrahydroaldosterone glucuronide.
    Notes: Zusammenfassung Zur Isolierung von Tetrahydroaldosteronglucuronid und 18-Aldosteronglucuronid aus menschlichem Urin wird eine Kombination von verschiedenen Methoden angegeben, und die einzelnen Schritte werden diskutiert. Die Ausbeute für das Tetrahydroaldosteronglucuronid beträgt 80% und für das 18-Aldosteronglucuronid knapp 50%.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In adrenalectomized rats the mineralocorticoid activity of the aldosterone metabolite tetrahydroaldosterone was 1/50 of the activity of aldosterone. The two main metabolites of aldosterone, tetrahydroaldosterone glucuronide and 18-aldosterone glucuronide, showed no more mineralocorticoid activity.
    Notes: Zusammenfassung Die Untersuchungen ergeben, daß Tetrahydroaldosteron im Tierversuch an der adrenalektomierten Ratte eine noch deutliche mineralocorticoide Aktivität besitzt, die etwa 1/50 derjenigen von Aldosteron entspricht. Tetrahydroaldosteronglucuronid und 18-Aldosteronglucuronid dagegen zeigen bei den verwendeten Dosen, die bis zu 300fach höher sind als diejenigen von Aldosteron, keine signifikante Wirkung mehr.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 71-79 
    ISSN: 1432-1440
    Keywords: ADH ; Angiotensin ; Bluthochdruck ; akutes Nierenversagen ; Vasopressin ; Angiotensin ; Hypertension ; Acute renal failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Studies on the vasopressor role of the antidiuretic hormone arginine-vasopressin (AVP) in DOC hypertension, in two-kidney Goldblatt hypertension, and in spontaneous hypertension of rats, and during acute blood pressure elevation after intracerebroventricular injection of angiotensin II and in glycerol-induced acute renal failure of rats are reviewed. For the measurement of plasma AVP a radioimmunoassay has been developed. For this assay, a series of criteria has been met which allows the conclusion that, in plasma of rats, the antibody measures AVP only. For the blockade of vasopressor effects of AVP a specific antiserum has been used. On the basis of a series of control studies it has been concluded, but not proven that the antiserum lowers blood pressure exclusively by blockade of AVP. It could be shown that in the various animal models of hypertension and of acute blood pressure elevation AVP exerts systemic vasoconstriction when its plasma concentrations are elevated. In those models where the renin-angiotensin system played no role in blood pressure control, the height of blood pressure was closely related to the plasma AVP concentrations. When this relationship was compared with that obtained after the i.v. infusion or injection of AVP, a marked shift to the left became apparent. Hence, sensitization to the vasopressor effect of AVP had occurred, the factor of sensitization amounting to more than 1,000. It is concluded that AVP is not only an antidiuretic hormone but also a vasopressor hormone, and that any systemic vasopressor effect of AVP requires a mechanism of sensitization.
    Notes: Zusammenfassung Es wird eine zusammenfassende Darstellung gegeben über Untersuchungen zur vasopressorischen Wirkung von Arginin-Vasopressin (AVP) bei Ratten mit renalem, spontanem und DOC-induziertem Hochdruck, sowie beim akuten Blutdruckanstieg nach intracerebroventrikulärer Injektion von Angiotensin II und im akuten Nierenversagen. Zur Messung von Plasma-AVP wurde ein Radioimmunoassay entwickelt. Aufgrund einer Reihe von erfüllten Kriterien konnte geschlossen, jedoch nicht bewiesen werden, daß der verwendete Antikörper in Plasma-Extrakten ausschließlich AVP mißt. Zur Hemmung der vasopressorischen Wirkung von AVP wurde ein spezifisches AVP-Antiserum verwendet. Die Resultate einer Reihe von Kontroll-Versuchen erhärteten den Schluß, erbrachten jedoch nicht den Beweis, daß dieser Antikörper eine Blutdrucksenkung ausschließlich durch AVP-Blockade verursacht. Für die genannten Tiermodelle wurde gezeigt, daß AVP dann eine systemische Vasokonstriktion und damit einen erhöhten Blutdruck verursacht, wenn seine Plasma-Konzentrationen erhöht sind. In den Hochdruckmodellen, in welchen das Renin-Angiotensin-System keine Rolle in der Blutdruckregulation zu spielen scheint, besteht zwischen Blutdruckhöhe und der entsprechenden AVP-Plasmakonzentration eine enge quantitative Beziehung. Wenn diese Beziehung verglichen wird mit der entsprechenden Beziehung während AVP-Infusion im normotensiven Tier, so zeigt sich eine starke Linksverschiebung. Daraus geht hervor, daß in den verschiedenen Hochdruckmodellen eine Sensibilisierung auf die vasopressorische Wirkung des AVP stattfindet und zwar um ein Ausmaß, das den Faktor 1000 übersteigt. Aufgrund der dargestellten Befunde wird geschlossen, daß AVP nicht nur das antidiuretische Hormon ist, sondern auch ein vasopressorisches Hormon, und daß eine notwendige Voraussetzung für einen vasopressorischen Effekt von AVP ein Sensibilisierungs-Mechanismus ist.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 15 (1972), S. 808-812 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Biochemistry 22 (1990), S. 247-251 
    ISSN: 0020-711X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 17 (1988), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of the present report was to document the stress response produced by physical and chemical abuses to human periodontal ligament cells, and to review some of the known functions of stress response proteins produced as a result of such treatments. For these studies human PDL cells were exposed to sublethal challenges of 43°C heat, sodium arsenite and the amino acid analog L-azetidine-2-carboxylic acid (AZC). The cells were labelled with [35S]-methionine and the proteins produced were examined by autofluorography of SDS-PAGE gels. Heat challenges were shown to induce hsps with an apparent mol. wts. of 90K, 68-72K, 41–47K, and 36 K. Arsenite-treated cells produced similar hsps including a 30k protein not produced by other forms of stress. AZC treatment resulted in the production of apparent functionless hsps with apparent molecular weights of 90,000, 72,000, 68,000 and 36,000. The function of these proteins and their possible role in periodontal disease is discussed.
    Type of Medium: Electronic Resource
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