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Cholinergic responses in cloned human TE671/RD tumour cells.
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The cholinergic responses of the human tumour cell line TE671/RD were examined using digital Ca2+ imaging fluorescence microscopy and patch-clamp measurements. In response to stimulation of the muscarinic acetylcholine (ACh) receptor (mAChR), the intracellular concentration of Ca2+ ([Ca2+]i) rose
Phorbol ester facilitates 45Ca accumulation and catecholamine secretion by nicotine and excess K+ but not by muscarine in rat adrenal medulla.
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Several investigators have shown that tumour promoter phorbol esters mimic the effects of endogenous diacylglycerol to activate a second messenger, protein kinase C. These phorbol esters have proved to be valuable tools for exploring the role of protein kinase C in many cellular functions. We
Vasoactive intestinal polypeptide (VIP) induces calcium mobilization in the human neuroblastoma cell line SK-N-SH.
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Release of catecholamines, a Ca2(+)-dependent process, is the most useful biochemical marker in the diagnosis of neuroblastoma. Unfortunately, its stimulus is still unknown. We found that vasoactive intestinal polypeptide (VIP), in addition to acetylcholine and muscarine (but not nicotine), causes
Natural products as probes for new drug target identification.
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One traditional aspect of natural products in medical research has been their use in the identification and investigation of the physiological/pathological role of receptors and enzymes as possible targets for drug design programmes. Classical examples of this function of natural products in drug
Dysfunction of the non-neuronal cholinergic system in the airways and blood cells of patients with cystic fibrosis.
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The non-neuronal cholinergic system is widely expressed in human airways, skin and immune cells. Choline acetyltransferase (ChAT), acetylcholine and nicotine/muscarine receptors are demonstrated in epithelial surface cells, submucosal glands, airway smooth muscle fibres and immune cells. Moreover,
Arecoline increases basic fibroblast growth factor but reduces expression of IL-1, IL-6, G-CSF and GM-CSF in human umbilical vein endothelium.
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BACKGROUND
Areca nut chewing is associated with oral submucous fibrosis (OSF). Raised vascular basic fibroblast growth factor may induce fibrosis. Arecoline is a muscarinic alkaloid in areca nut, which we earlier reported causes injury and necrosis of human endothelium.
METHODS
Human umbilical vein
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