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  • 1
    ISSN: 1432-1912
    Keywords: Secretoneurin ; Noradrenaline ; Large dense core vesicles ; Calcium channel blockers ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Secretoneurin is a newly discovered peptide found in high concentrations in brain. We have studied the release of secretoneurin and noradrenaline from superfused hypothalamic slices from rat brain. Both electrical stimulation and potassium induced depolarisation released secretoneurin and noradrenaline from these slices in a calcium-dependent manner. Electrical stimulation caused a preferential release of noradrenaline when compared to the secretion elicited by high potassium. The time course of secretoneurin release was more protracted than that of noradrenaline. The calcium channel blocker ω-conotoxin inhibited only the electrically induced release of noradrenaline, whereas nifedipine inhibited only that of secretoneurin. These results establish that secretoneurin is secreted from neurons. Inhibition of this release by nifedipine is consistent with the concept that secretion from large dense core vesicles occurs at sites different from that of small vesicles and depends on calcium influx via L-type calcium channels.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 19 (1998), S. 146-150 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Leiomysarkom ; Samenstrang ; β-hCG ; Paraneoplastische Hormonsekretion ; Key words Leiomyosarcoma ; Spermatic cord ; β-hCG ; Paraneoplastic hormone secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Leiomyosarcomas of the spermatic cord are very rare tumours, which, in contrast to the rhabdomyosarcoms of childhood, occur almost exclusively in adults. We report the case of a 51-year-old male patient with a metastasizing, pleomorphic leiomyosarcoma of the spermatic cord. The tumour showed paraneoplastic secretion of beta-chain human chorionic gonadotropin (β-hCG), as was demonstrated by the elevated levels of β-hCG in serum samples and by immunohistochemistry. Histologically, the tumour was a high-grade leiomyosarcoma which showed an aggressive course with pulmonary metastases appearing 4 months after primary surgery. A concomitant rise in the serum levels of β-hCG was also noted at this time. A wide spectrum of tumours with a choriocarcinomatous component or paraneoplastic production of β-hCG has been described, the vast majority being carcinomas. Only two leiomyosarcomas producing β-hCG have so far been reported. The paraneoplastic production of β-hCG should prevent confusion with germ-cell tumours, especially teratomas.
    Notes: Zusammenfassung Leiomyosarkome des Samenstranges sind sehr seltene Tumoren, die im Gegensatz zu den im Kindesalter häufigeren Rhabdomyosarkomen des Samenstranges nahezu ausschließlich im Erwachsenenalter auftreten. Wir berichten über ein metastasierendes, pleomorphes Leiomyosarkom des Samenstranges bei einem 51 Jahre alten Patienten mit paraneoplastischer β-hCG-Sekretion des Tumors, die sowohl serologisch als auch immunhistologisch nachgewiesen werden konnte. Trotz adjuvanter, postoperativer Radiotherapie kam es im weiteren Verlauf zu einer frühzeitigen pulmonalen Metastasierung mit Wiederanstieg der β-hCG Werte im Serum. Eine β-hCG-Produktion ist bisher außer bei Keimzelltumoren bei einer Vielzahl von weiteren Tumoren beschrieben worden, darunter fast ausschließlich Karzinomen. Bei Leiomyosarkomen wurde dieses Phänomen dagegen bisher nur in 2 Fällen dokumentiert. Diese paraneoplastische Hormonproduktion hat v.a. angesichts der hodennahen Lokalisation unseres Leiomyosarkoms Bedeutung für die differentialdiagnostische Abgrenzung von Keimzelltumoren des Hodens oder deren Metastasen.
    Type of Medium: Electronic Resource
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