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  • 1
    ISSN: 1436-0691
    Keywords: bacterial translocation ; liver resection ; isolated enterocytes ; protein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract After major liver resection, bacterial infectious complications, including sepsis and endotoxemia, can be at least in part, attributed to translocation of enteric bacteria and endotoxin. We evaluated the effectiveness of the enteral and parenteral administration of branched-chain amino acids (BCAA) in preventing bacterial translocation after 70% liver resection in rats with thioacetamide-induced-cirrhosis. Bacterial translocation after hepatectomy was induced by a disturbance of protein metabolism in intestinal epithelial cells. However, the administration of BCAA, particularly via the enteral route, improved amino acid metabolism in the gut and stimulated the synthesis of nonsecreted protein and the proliferation of crypt cells, thereby preventing bacterial translocation after liver resection. Improvement in this cascade of metabolic reactions is believed to have been responsible for the improved outcome after extensive resection of the cirrhotic liver.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1912
    Keywords: Chromaffin cell ; l-[3H]Nicotine ; Nicotinic acetylcholine receptor ; Binding assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To characterize the properties of nicotinic acetylcholine receptors (nAChRs) in autonomic ganglia, we examined l-[3H]nicotine binding to membrane fraction prepared from cultured bovine adrenal chromaffin cells, using a modified filtration method. Binding of l-[3H]nicotine to non-treated glass fiber filters interfered with the detection of specific binding to the membrane fraction. Presoaking glass fiber filters in 3% or higher concentrations of polyethyleneimine (PEI) solution (sixty times higher than earlier used concentration) for at least 5 h could reduce the binding of l-[3H]nicotine to the filters to the background level. Specific l-[3H]nicotine binding to the membrane fraction was detected only when the membrane fraction was prepared in Ca2+- and Mg2+ (EDTA, EGTA and protease inhibitors were added)-free buffer. Specific binding of l-[3H]nicotine was saturable and reversible. Both computer program and Scatchard analysis revealed a single class of high affinity binding sites with an average Kd of 8.9 nM and a Bmax of 42.5 fmol/mg protein. The Hill coefficient was 0.98. In inhibition studies, both cholinergic agonists (carbachol and l-nicotine) and ganglionic agonists (lobeline and 1,1-dimethyl-4-phenylpiperazinium iodide) were much effective in inhibiting l-[3H]nicotine binding, whereas both neuromuscular blocking (α-bungarotoxin and d-tubocurarine) and ganglionic blocking agents were less effective. These results suggest that high affinity nicotinic binding sites on adrenal chromaffin cells are nAChRs of the ganglion-type, which have properties different from nAChRs on the neuromuscular junction but similar to nAChRs in the brain.
    Type of Medium: Electronic Resource
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