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  • 1
    ISSN: 1432-1440
    Keywords: Endothelin ; Liver ; Sinusoidal endothelial cells ; Transforming growth factorβ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Endothelin is the most potent vasoconstrictor peptide known today. Using a radioimmunoassay for endothelin, we measured immunoreactive endothelin in culture media of guinea pig sinusoidal endothelial liver cells and human umbilical vein endothelial cells. A time-dependent release of immunoreactive endothelin by confluent sinusoidal endothelial liver cells in culture was found. Sinusoidal endothelial liver cells produced similar amounts of immunoreactive endothelin as umbilical vein endothelial cells, about 900 pg/μg DNA per 24 h. In the presence of transforming growth factorβ a dose-dependent increase of immunoreactive endothelin release was measured. The maximal increase of 50% was found at a concentration of 1 ng transforming growth factor per ml. To a similar extent Kupffer cell-conditioned media augmented the release of immunoreactive endothelin by sinusoidal endothelial liver cells, especially when Kupffer cells had been stimulated by endotoxin. Endotoxin itself did not alter the release of immunoreactive endothelin. Endothelin released by sinusoidal endothelial liver cells might influence the pericytes of the liver, i.e., the Ito-cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Human immunodeficiency virus ; Hepatitis B virus ; Interferon-α ; Corticosteroid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 48-year-old male patient was admitted with acquired immunodeficiency syndrome (stage III, Centers for Disease Control 1993) and viremic hepatitis B. Blood CD4 count was 15/μl. Discontinuation of prednisolone, previously prescribed by the patient's family practitioner because of elevated liver enzymes, resulted in severe hepatitis (alanine aminotransferase 〉 300U/1). Administration of interferon-α, (9 × 106U s.c. 3 × weekly) was initiated. Serum markers of viral replication disappeared, and aminotransferase levels returned to normal within a few weeks. The patient's serum was found negative for HBsAg after 3 months. Immunohistochemical analysis of liver biopsies before and during interferon therapy showed disappearance of all hepatitis B virus antigens and a marked reduction in inflammatory activity. Hepatitis B virus seroconversion remained stable until the patient died from the syndrome 2 years later. This case shows that in spite of severe HIV-associated immune deficiency with CD4 counts constantly below 100/μl, interferon-α can lead to sustained serological and histological improvement of viremic hepatitis B. Previous administration and discontinuation of cortisone may have helped to reach this effect.
    Type of Medium: Electronic Resource
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