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A diversity of nicotinic acetylcholine receptor (nAChR) subtypes has been identified in mammalian brain using recombinant DNA technology. Alterations in the activity of these acetylcholinegated ion channels have been implicated in a number of central nervous system disorders including Alzheimer's disease (AD). The potential therapeutic usefulness of(More)
Recent evidence suggests that the level of interleukin-6 (IL-6) is elevated in Alzheimer's disease (AD) brains. IL-6 is produced by reactive glial cells and could potentially affect neuronal survival. Understanding the biochemical mechanism that regulates the production and release of IL-6 by astrocytic cells may help to identify potential targets for(More)
Exposure of L1210 leukemia cells first to 0.1 to 100 micromolar methotrexate and then to 10 micromolar 5-fluorouracil produces a synergistic effect on the number of cells killed in culture. Methotrexate dose-related increases occur in the concentrations of intracellular 5-fluorouracil ribonucleotides and 5-fluoro-2'-deoxyuridylate and in the incorporation(More)
The modulation of 5-fluorouracil (FUra) metabolism by methotrexate (MTX) pretreatment in monolayer cultures of human colorectal adenocarcinoma. HCT-8, was examined and correlated to clonal growth of this cell line. There was a gradual and nearly linear total intracellular accumulation and incorporation into RNA of FUra for 30 hr in control cells. A 12-hr 10(More)
Activation of the classical complement cascade by beta-amyloid peptides has been hypothesized to underlie the neurodegeneration observed in Alzheimer's diseased brains. In this study, various lots of synthetic beta-amyloid peptides, A beta(1-40), A beta(1-42), and A beta(25-35), were tested for their ability to activate both early complement cascade events(More)
The binding of 5-fluoro-2'-deoxyuridylate generated from 5-fluoro-2'-deoxyuridine in intact cells was used to measure changes in the level of thymidylate synthetase during the course of population growth of murine leukemia L 1210 cells. By the use of elutriation techniques and flow cytometric analysis, the amount and activity of thymidylate synthetase(More)
The cytokinetic and cytotoxic interactions involved in combining tamoxifen, methotrexate, and 5-fluorouracil were studied in two hormone-dependent human breast cancer cell lines, 47-DN and MCF-7. These cells had measurable cytosol and nuclear estrogen receptor and cytosol progesterone receptor. Growth of the MCF-7 cells in medium containing gelding serum(More)
To investigate the consequences of complement activation on neuronal viability, the effects of serum treatment on neuron-rich and mixed neuronal/glial cultures were evaluated. The neurotoxicity observed following treatment with either human or rat serum was variable and did not appear to be mediated through a complement-mediated mechanism. Serum lots(More)
We have previously shown that activation of the phosphatidyl-inositol/phospholipase C pathway could induce interleukin 6 (IL-6) release from U373MG human astrocytomes cells. We also found that, although interleukin 1 beta (IL-1 beta) did not activate phosphatidy-linositol turnover, it induced, a robust release of IL-6. In the present study, we examined the(More)
Activation of muscarinic cholinergic receptors (mAChRs) in the central nervous system reduces the catalytic activity of membrane-bound adenylate cyclase and attenuates depolarization-dependent release of acetylcholine (ACh). Inasmuch as reports have indicated that these mAChR-mediated responses exhibit pharmacological profiles similar to the M2 subclass of(More)