Peggy Muller

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Plants employ a specialized transport system composed of separate influx and efflux carriers to mobilize the plant hormone auxin between its site(s) of synthesis and action. Mutations within the permease-like AUX1 protein significantly reduce the rate of carrier-mediated auxin uptake within Arabidopsis roots, conferring an agravitropic phenotype. We are(More)
The Wnt/beta-catenin pathway plays an important role in embryonic liver development, morphogenesis, and organogenesis. Here, we report on the activation of beta-catenin during early postnatal liver growth. Modulation of beta-catenin expression was studied in CD-1 mice livers over a time course of 0 to 30 postnatal days (PD) and 3 mo. Increases in total and(More)
Hepatocyte growth factor (HGF) and beta-catenin both play a crucial role in stimulating hepatocyte proliferation, but whether these 2 pathways cooperate in inducing hepatocyte proliferation is unclear. We have previously reported that beta-catenin forms a complex with c-Met (HGF receptor) that undergoes dissociation because of beta-catenin tyrosine(More)
Within the cholesterol biosynthesis cascade, the enzyme 2,3-oxidosqualene cyclase [EC] is of special interest due to its dual function: cyclization of 2,3-monoepoxysqualene to lanosterol and 2,3;22,23-diepoxysqualene to oxylanosterol. Further determination of the significance of this enzyme for the intracellular cholesterol homeostasis was done(More)
BACKGROUND/AIMS Inhibition of hepatoma cells by cyclooxygenase (COX)-2-dependent and -independent mechanisms has been shown previously. Here, we examine the effect of Celecoxib, a COX-2-inhibitor and R-Etodolac, an enantiomer of the nonsteroidal anti-inflammatory drug Etodolac, which lacks COX-inhibitory activity, on the Wnt/beta-catenin pathway and human(More)
Specific antibodies against types I and III collagens and procollagens were used to localize these proteins in cultured human cells. These studies indicate that the same cell makes both proteins. No type III procollagen synthesis was observed in cells from two patients with two patients with the Ehlers-Danlos type IV syndrome.
Background and aims: In the pancreas, myofibroblasts (MFBs) were shown to play an important role in the cellular response during inflammation and injury. However, there is only fragmentary information concerning the fate of these cells in pancreas regeneration and fibrosis development. Methods: Explant cultures of rat pancreatic tissue were used as a model(More)
Bioreactors containing porcine or adult human hepatocytes have been used to sustain acute liver failure patients until liver transplantation. However, prolonged function of adult hepatocytes has not been achieved due to compromised proliferation and viability of adult cells in vitro. We investigated the use of fetal hepatocytes as an alternative cell source(More)
We report the identification of a novel p75TNF receptor isoform termed icp75TNFR, which is generated by the use of an alternative transcriptional start site within the p75TNFR gene and characterized by regulated intracellular expression. The icp75TNFR protein has an apparent molecular mass of approximately 50 kDa and is recognized by antibodies generated(More)
UNLABELLED The Wnt signaling pathway is essential for a wide array of developmental and physiological processes. Wnts are extracellular ligands that bind to frizzled (Fz) receptors at the membrane, canonically inducing beta-catenin nuclear translocation and activation. Although beta-catenin has been shown to be critical in liver biology, the expression of(More)