[Lipid disposition in the skin].
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Biomedical subjects
Publications and source records attributed to Annemarie Musch.
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Activation of the endothelin-1 system plays a key role in the pathogenesis of pulmonary arterial hypertension (PAH). The endothelin-1 receptor antagonist bosentan inhibits the action of endothelin-1 at both receptor subtypes (ET(A) and ET(B) receptors) and has been approved for PAH therapy since 2001. Recent data were presented at an international symposium in Barcelona in February 2006.
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BACKGROUND/AIMS: Hepatocellular carcinomas (HCC) often show resistance to the effects of transforming growth factor-beta (TGF-beta). This study focuses on molecular mechanisms of this resistance to explore ways to overcome it. METHODS: Transcription and protein expression of TGF-beta type I and type II receptors (TGF-betaRI/RII) were analyzed in clinical HCCs and the human hepatoma cell lines HuH-7 and HepG2. HuH-7 cells were transiently and stably transfected with a constitutively active TGF-betaRI mutant (CA TGF-betaRI). Resulting growth kinetics, integrin expression, invasiveness, TGF-beta-mediated activation of human plasminogen activator inhibitor type-1 (PAI-1) promoter and Smad expression were determined. RESULTS: In clinical HCCs, there was less TGF-betaRII (6/10 cases) and more TGF-betaRI (8/10 cases) protein expression detectable in tumor compared to adjacent liver tissue. In HuH-7 cells, TGF-betaRII expression was likewise decreased. Cells transiently transfected with CA TGF-betaRI exhibited strong TGF-beta-related PAI-1 promoter activation. Stably transfected cells showed an attenuated response of the PAI-1 promoter, but increased Smad7 expression. Proliferation of stable clones was decreased. There was no change in integrin expression or invasiveness. CONCLUSIONS: Decreased TGF-betaRII protein expression might cause TGF-beta resistance in a subset of clinical HCCs. Stable transfection with CA TGF-betaRI reverses this in HuH-7 cells without increasing invasiveness.
AIM: Aloe vera, plant extracts of Aloe barbadensis miller, is widely used in phytomedicine. The first case of acute hepatitis due to this compound was described. METHODS: Description of a clinical case. RESULTS: Hepatitis in a 57-year old female could be linked to the ingestion of Aloe barbadensis miller compounds. The patient's hepatitis resolved completely after discontinuing this medication. CONCLUSION: The case emphasizes the importance of considering phytopharmaceutical over-the-counter drugs as causative agents of hepatitis.
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