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  • 2005-2009
  • 1995-1999  (4)
  • 1998  (2)
  • 1997  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 25 (1998), S. 0 
    ISSN: 1440-1681
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: 1. In addition to their contribution to endothelium-derived hyperpolarization, our understanding of the physiological function of epoxyeicosatrienoic acids (EET) within the vascular wall and the actual enzymes involved in the formation of the EET in endothelial cells is very limited. In the present study, the expression of potential cytochrome P450 (CYP) mono/epoxygenases was assessed in endothelial cells isolated from porcine and bovine aortas as well as in the human umbilical vein-derived cell lines EA.hy926andECV304.2. Expression of CYP2B1, CYP2E1 and CYP3A could be found. The latter were inducible by dexamethasone/cloflbrate for 72 h, a procedure that also enhanced CYP epoxygenase activity in endothelial cells.3. Enzyme induction yielded increases in capacitative Ca2+ entry and membrane hyperpolarization in response to autacoids, such as bradykinin and thapsigargin. Thiopentone sodium, an inhibitor of endothelial CYP mono/epoxygenase(s), diminished autacoid-induced capacitative Ca2+ entry and membrane hyperpolarization, while the effect of EET remained unchanged.4. Epoxyeicosatrienoic acids activated endothelial tyrosine kinase activity in a concentration-dependent manner. Arachidonic acid, at 20-fold higher concentrations, also increased tyrosine kinase activity. Because only the effect of arachidonic acid was inhibited by thiopentone sodium, an inhibitor of CYP mono/epoxygenases, these data suggest that arachidonic acid needs to be converted to the EET in order to stimulate tyrosine kinase.5. All these data provide clear evidence that the CYP epoxygenase-derived arachidonic acid metabolites (EET) not only serve as potential endothelium-derived hyperpolarizing factors but also constitute highly active intracellular messengers with a physiological role including the control of Ca2+ signalling, membrane potential and tyrosine kinase activity.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    [s.l.] : Macmillan Magazines Ltd.
    Nature 389 (1997), S. 884-888 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The mouse Brachyury (T) gene is the prototype of a growing family of so-called T-box genes which encode transcriptional regulators and have been identified in a variety of invertebrates and vertebrates, including humans. Mutations in Brachyury and other T-box genes result in drastic embryonic ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1433-0385
    Schlagwort(e): Key words: Renal hyperparathyroidism ; Operative therapy ; Prospective follow-up study. ; Schlüsselwörter: Renaler Hyperparathyreoidismus ; operative Therapie ; prospektive Beobachtungsstudie.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung. In einer prospektiven Beobachtungsstudie bei Patienten mit renalem Hyperparathyreoidismus wurden nach Eingriffen an den Nebenschilddrüsen der Verlauf und die Abhängigkeit der Symptomatik von präoperativ ermittelten Laborparametern analysiert. Zwischen dem 1. 8. 1987 und dem 31. 12. 1995 wurden 79 Patienten operiert. Bei 72 Patienten erfolgten erstmalige Eingriffe an den Nebenschilddrüsen. Bevorzugtes Operationsverfahren war die totale Parathyreoidektomie mit autologer Epithelkörperchenreplantation (n = 67). Informationen zum postoperativen Verlauf liegen von allen Patienten vor. Bei 74 der 79 Patienten erfolgten regelmäßige Nachuntersuchungen (1–9, Median = 4) mit einer Nachbeobachtungszeit von 1–60 Monaten (Median 18 Monate). Das Ausmaß der postoperativen Hypocalciämie, die bei 84,8 % aller Patienten auftrat, war negativ mit der Höhe der präoperativen Serumkonzentrationen der alkalischen Phosphatase sowie des intakten Parathormons korreliert. Juckreiz klang postoperativ bei über 60 % der betroffenen Patienten innerhalb von 4 Wochen ab, während sich das ossäre Syndrom längerfristig zurückbildete. Ein Jahr postoperativ war der Juckreiz in 75 % und das ossäre Syndrom in 79 % der Fälle abgeklungen. In der Patientengruppe nach totaler Parathyreoidektomie mit simultaner Epithelkörperchenreplantation waren Gelenkschmerzen bei präoperativ erhöhten Spiegeln der alkalischen Phosphatase (〉 200 U/l) rascher rückläufig als bei normalen Spiegeln (p = 0,0297). Die Rezidivrate nach totaler Parathyreoidektomie und Autotransplantation beträgt 4,5 %. Patienteneigene Faktoren beeinflussen die Morbidität des Eingriffs wegen eines renalen Hyperparathyreoidismus. Die postoperative Hypocalciämie korreliert negativ mit dem Grad der zum Operationszeitpunkt vorliegenden renalen Osteopathie. Die Höhe der präoperativen Konzentration der alkalischen Phosphatase beeinflußt den zeitlichen Verlauf der postoperativen Rückbildung von Gelenkschmerzen.
    Notizen: Summary. A prospective long-term follow-up study in patients who had had surgical therapy for renal hyperparathyroidism was launched to investigate the results of surgical treatment and to evaluate possible correlations between preoperative laboratory values and the course of the symptoms. From August 1987 to December 1995, 79 patients underwent surgery for renal hyperparathyroidism. It was the first neck exploration for 72 patients. Total parathyroidectomy with autotransplantation to a forearm was our preferred procedure (n = 67). The postoperative course of all patients is known. We carried out one to nine reexaminations (median 4) in 74 of 79 patients. The follow-up period ranged from 1 month to 5 years with a median of 18 months. After the operation transient hypocalcaemia occurred in 84.8 % of patients. Postoperative hypocalcaemia correlated negatively with the preoperative levels of alkaline phosphatase and intact parathyroid hormone. Within the first month after surgery 60 % of the preoperatively affected patients completely recovered from pruritus, whereas the skeletal syndrome took longer to disappear. One year after surgery 75 % of the patients with pruritus and 79 % of those with skeletal syndrome had became asymptomatic. After total parathyroidectomy with autotransplantation, patients with preoperatively elevated concentrations of alkaline phosphatase ( 〉 200 U/l) experienced faster relief from joint pain than patients with preoperatively normal concentrations (P = 0.0297). To date 4.5 % of the patients developed recurrent hyperparathyroidism after total parathyroidectomy with autotransplantation. Morbidity of surgery for renal hyperparathyroidism is influenced by patients' risk factors. Postoperative hypocalcaemia correlates negatively with the grade of renal osteopathy at the time of operation. Preoperative concentrations of alkaline phosphatase influence the rapidity of the relief from joint pain.
    Materialart: Digitale Medien
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  • 4
    ISSN: 1432-1777
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. The secretory carrier membrane proteins (SCAMPs) are highly conserved integral vesicle membrane components of the post-Golgi secretory and endocytic pathways. We have isolated and characterized the porcine SCAMP1 cDNA and gene coding for a variant of the SCAMP family. The SCAMP1 cDNA has a length of 3827 bp including a 133-bp 5′ and 2701-bp 3′ untranslated region. The mRNA has an open reading frame of 1014 nt coding for a protein of 338 amino acids with a calculated molecular mass of 37.9 kDa and a pI of 7.9. The porcine SCAMP1 is 97.04% identical with the human and rat paralogs, respectively. The SCAMP1 gene consists of nine exons with sizes ranging from 78 to 2842 bp and spans at least 70 kb of genomic DNA on porcine Chromosome (Chr) 2q21–q22. The promoter of the SCAMP1 gene is TATA-box-less, and transcription starts at a G-nucleotide 133 nt upstream the start codon.
    Materialart: Digitale Medien
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