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  • Articles: DFG German National Licenses  (4)
  • Amiloride  (2)
  • Lichen sclerosus et atrophicus  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 259 (1996), S. 45-50 
    ISSN: 1432-0711
    Keywords: Key words: Amelanotic melanoma ; Vulvar neoplasms ; Lichen sclerosus et atrophicus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We report on a 60 year old patient with a 6 month history of vulval pruritus and an erosive vulval lesion which was mistaken for lichen sclerosus et atrophicus. Histologically the diagnosis of an amelanotic malignant melanoma of the vulva was established. We review the literature about this rare malignant tumor.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Vulvaneoplasie ; Amelanotisches malignes Melanom ; Lichen sclerosus et atrophicus ; Key words Vulvar neoplasia ; Amelanotic malignant melanoma ; Lichen sclerosus et atrophicus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Malignant melanoma of the vulva is an uncommon disease. The amelanotic subtype is only rarely mentioned. We report a 60-year-old patient with a 6 month history of vulvar pruritus. Ivory lesions combined with erosions and fine `cigarette paper' – like wrinkling were suspicious for lichen sclerosus et atrophicus. Histologically the diagnosis of an amelanotic malignant melanoma was made. Amelanotic melanoma may present with a wide variety of clinical features. Even in the uncommon location of the vulva, amelanotic melanoma should be suspected in any nonhealing nonpigmented lesion.
    Notes: Zusammenfassung Das maligne Melanom der Vulva ist ein sehr seltener Tumor. Die amelanotische Variante ist nur in wenigen Fällen in der Literatur beschrieben. Wir berichten über eine 60jährige Patientin, die sich mit einer chronisch nässenden Vulvaläsion vorstellte. Die weißlichen Herde in Verbindung mit Erosionen und teilweise zigarettenpapierartiger Fältelung der Haut ließen klinisch v.a. an einen Lichen sclerosus et atrophicus denken. Histologisch zeigte sich ein amelanotisches malignes Melanom. Mit unserer Fallbeschreibung möchten wir ein weiteres Beispiel geben für die große morphologische Vielfalt des amelanotischen malignen Melanoms.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2013
    Keywords: Amiloride ; Cl− transport ; Diluting segment ; K+ conductance ; Adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The hypothesis was tested whether amiloride and/or an acute acid load influence Cl− transport in the diluting segment of the isolated-perfused kidney of the K+ adapted frog (rana pipiens). Transepithelial resistance (luminal cable analysis) and Cl− net flux (Cl− sensitive microelectrodes) were evaluated at various concentrations of amiloride, at highpCO2 or low HCO 3 − in the kidney perfusate. Amiloride or an acute acid load increase transepithelial resistance. The resistance-change at given concentrations of amiloride is markedly enhanced under static head conditions, i. e. at low luminal NaCl concentrations. Amiloride or acidosis (highpCO2) reduce Cl− net reabsorption; combination of both potentiates this inhibitory effect. We conclude: an acute acid load acidifies the cell cytosol. This effect is aggravated dramatically after amiloride-induced inhibition of the luminal Na+/H+ exchanger. The luminal pH-sensitive K+ conductance decreases. This results in a depolarization of the cell membranes. Consequently, the peritubular electrochemical driving force for the exit step of Cl− (from cell to blood) dissipates. Therefore, Cl− net reabsorption is blunted.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2013
    Keywords: Diluting segment ; Furosemide ; K+-conductance ; Amiloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Experiments were performed in the isolated perfused kidney of K+ adaptedRana pipiens to investigate the relationship between luminal K+ conductance and H+ transport in cells of the diluting segment. Inhibition of luminal Na+/H+ exchange by amiloride or by omission of luminal Na+ blocked luminal K+ conductance. Acidification of the kidney perfusate by elevation of pCO2 also reduced luminal K+ conductance. This effect could be prevented by furosemide. Since the steepest transcellular Na+ potential difference, directed from the lumen into the cell, is found when luminal Na+/Cl−/K+ cotransport is inhibited by furosemide, we conclude that luminal Na+/H+ exchange is most efficient at these conditions and thus could attenuate intracellular acidification.
    Type of Medium: Electronic Resource
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