8 research outputs found

    Met-enkephalin immunoreactivity in blood platelets

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    Picogram amounts (50-150 pg/mg protein) of immunoreactive met-enkephalin material (met-enkephalin in IR) were detected by radioimmunoassay in human, rat and rabbit platelets. Characterization of this material by thin-layer chromatography, gel filtration chromatography and high-pressure liquid chromatography indicated that it behaves identically with synthetic met-enkephalin. No high molecular weight met-enkephalin IR could be detected in the platelet extracts, even after trypsin hydrolysis, using two antisera which are able to recognize some of the putative met-enkephalin precursors present in the adrenal gland or striatum. In vitro, thrombin released platelet met-enkephalin in IR concomitantly with 5-hydroxytryptamine (5-HT), suggesting a common subcellular localization, i.e. the 5-HT storing organelles, for met-enkephalin IR and the amine. In vivo, platelet met-enkephalin IR in the Sprague-Dawley rat was affected neither by adrenalectomy nor by hypophysectomy. Thirteen- and 18-week-old spontaneous hypertensive rats (SHR) had lower platelet concentrations of met-enkephalin in IR than age matched normotensive Wistar-Kyoto rats

    Protection against apoptosis by monoamine oxidase A inhibitors

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    Several lines of evidence have been accumulating indicating that an important role may be played by mitochondrial homeostasis in the initiation phase, the first stage of apoptosis, This work describes the results obtained by using different inhibitors of monoamine oxidases (MAO), i.e. paragyline, clorgyline and deprenyl, on mitochondrial integrity and apoptosis. Both pargyline and clorgyline are capable of protecting cells from apoptosis induced by serum starvation while deprenyl is ineffective. These data represent the first demonstration that MAO-A inhibitors may protect cells from apoptosis through a mechanism involving the maintenance of mitochondrial homeostasis, (C) 1998 Federation of European Biochemical Societies

    ATLAS: technical proposal for a general-purpose p p experiment at the large hadron collider at CERN

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