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Toxins from the venom of the African green mamba, Dendroaspis angusticeps, fulfill a major need for selective ligands for some of the five genetically defined subtypes of muscarinic acetylcholine receptors (m1-m5). Two toxins have been found that are highly selective antagonists for m1 and m4 receptors (m1-toxin and m4-toxin, respectively). Two other toxins(More)
The venom of the Eastern green mamba from Africa, Dendroaspis angusticeps, was found to block the binding of 3H-quinuclidinyl benzilate to pure m1 and m4 muscarinic ACh receptors expressed in Chinese hamster ovary cells. The principal toxin in the venom with anti-m1 muscarinic activity was purified by gel filtration and reversed-phase HPLC. This toxin has(More)
m1-Toxin was found to slow the dissociation of [3H]N-methyl-scopolamine (NMS) and [3H]pirenzepine from m1 muscarinic receptors expressed in the membranes of Chinese hamster ovary cells. When toxin-NMS-receptor complexes were formed in membranes and then dissolved in digitonin, or when these complexes were formed in solution, the toxin completely stopped the(More)
1. Plasma and biliary lipids were assessed in four strains of Syrian hamsters [Charles River Lakeview, (CHR), Biobreeder F1B (BIO), Harlan Sprague-Dawley (HAR) and Sasco (SAS)] fed a cholesterol-free diet. 2. Plasma cholesterol differed with SAS > CHR > HAR > BIO. 3. BIO Hamsters had the lowest HDL and highest VLDL + LDL/HDL ratio, but their biliary(More)
Because different strains of hamsters vary in their susceptibility to gallstones, the relationship between plasma lipoproteins, hepatic cholesterol, bile lipids and bile acid profile was examined during gallstone induction in strains of male Syrian hamsters from Charles River Lakeview (CHR), Biobreeder F1B (BIO) and Harlan Sprague-Dawley (HAR). Gallstones(More)
Acute phase serum amyloid A (A-apoSAA), but not constitutive apoSAA (C-apoSAA), was identified by Western blotting experiments in brain protein extracts from eight of nine patients with Alzheimer's disease (AD), one with a brain tumor and one with multiple sclerosis. A-apoSAA was not detected in six subjects with Pick's or Lewy Body disease or three other(More)
Immunohistochemical localization of the injury specific apolipoprotein, acute phase serum amyloid A (A-apoSAA), was compared in brains of patients with neuropathologically confirmed Alzheimer's disease (AD), multiple sclerosis (MS), Parkinson's disease (PD); Pick's disease (Pick's), dementia with Lewy bodies (DLB), coronary artery disease (CAD), and(More)
m1-Toxin is the only ligand which is known to bind specifically to the extracellular face of genetically defined m1 muscarinic receptors; it binds pseudoirreversibly. A variety of studies were performed to evaluate the usefulness of m1-toxin as a selective antagonist of m1 receptors. Exposure of slices of the rat cerebral cortex to m1-toxin in physiological(More)
During acute inflammation, the serum amyloid A (apoSAA) proteins apoSAA1 and apoSAA2 are transiently associated with high density lipoproteins (HDL) in concentrations of as much as 1000-fold more than their concentrations during homeostasis; however, their effect on HDL function is unclear. Recombinant apoSAAp, a hybrid of the closely related human apoSAA1(More)
The human apoSAA proteins comprise both acute phase (apoSAA1, apoSAA2) and constitutive (apoSAA4) isoforms; all are expressed in human atherosclerotic lesions as well as in liver. Recombinant acute phase apoSAA binds cholesterol with an affinity of approximately 170 nM and enhances cholesterol uptake by HepG2 cells (J. Lipid Res. 1995. 36:37-46). In the(More)