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Pagina 1 a partire dal 98 risultati
Phenanthroquinolizidine alkaloids from the roots of Boehmeria pannosa potently inhibit hypoxia-inducible factor-1 in AGS human gastric cancer cells.
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A bioassay-guided phytochemical investigation on the methanol extract of Boehmeria pannosa, using a HIF-1-mediated reporter gene assay, led to the isolation of two phenanthroquinolizidine alkaloids, (-)-cryptopleurine (1) and (-)-(15R)-hydroxycryptopleurine (2). The structure of the new compound 2
[Protective effect of Uncaria rhynchophylla total alkaloids pretreatment on hippocampal neurons after acute hypoxia].
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OBJECTIVE
To investigate the effect of Uncaria rhynchophylla total alkaloids (RTA) pretreatment on the voltage-gated sodium currents of the rat hippocampal neurons after acute hypoxia.
METHODS
Primary cultured hippocampal neurons were divided into RTA pre-treated and non-pretreated groups. Patch
Administration of Huperzia quadrifariata Extract, a Cholinesterase Inhibitory Alkaloid Mixture, has Neuroprotective Effects in a Rat Model of Cerebral Hypoxia-Ischemia.
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Neonatal hypoxia-ischemia (HI) is an etiologic component of several neurologic pathologies associated to cognitive impairment. The mechanisms involved in HI-induced tissue damage start immediately after HI and extend for days. Acetylcholine is an important neurotransmitter in the central nervous
Cerebroprotective effect of isolated harmine alkaloids extracts of seeds of Peganum harmala L. on sodium nitrite-induced hypoxia and ethanol-induced neurodegeneration in young mice.
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The aim of the study was to isolate the harmine alkaloids from the seeds of Peganum harmala (TAPH) and its cerebroprotective effect on cognitive deficit mice. The tested doses of TAPH were screened for Sodium nitrite induced hypoxia and Ethanol induced neurodegeneration using behavioral models. The
A new hypoxia inducible factor-2 inhibitory pyrrolinone alkaloid from roots and stems of Piper sarmentosum.
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A new trimethoxycinnamoyl-2-pyrrolinone alkaloid, langkamide (1), along with the known compounds piplartine (2) and 3,4,5-trimethoxycinnamic acid (3) were isolated from the roots and stems of the shrub Piper sarmentosum ROXB. The structures were established by spectroscopic analyses and comparison
[Effect of total alkaloids of kudouzi (Sophora alopecuroides L.) on tolerance to anoxia in mice].
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To several anoxia mice models, total alkaloids of Kudouzi (TASa) can prolong their tolerance time (ip < 1/10, 1/5LD50/kg, P < 0.05-0.01). In the experiment of myocardial ischemia induced by pituitrin, TASa decreased significantly the ST change in ECG (P < 0.05). The acute LD50 of TASa by ip was
Brucine, an alkaloid from seeds of Strychnos nux-vomica Linn., represses hepatocellular carcinoma cell migration and metastasis: the role of hypoxia inducible factor 1 pathway.
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Brucine is an alkaloid derived from the seeds of Strychnos nux-vomica Linn. which have long been used as a traditional medicine for the treatment of hepatocellular carcinoma (HCC) in China. HCC prognosis can be greatly influenced by metastasis. There has thus far been little research into brucine as
Terpenoid tetrahydroisoquinoline alkaloids emetine, klugine, and isocephaeline inhibit the activation of hypoxia-inducible factor-1 in breast tumor cells.
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Klugine (1), isocephaeline (2), and emetine (4) inhibited hypoxia-inducible factor-1 (HIF-1) activation by hypoxia in T47D breast tumor cells (IC(50) values 0.2, 1.1, and 0.11 muM, respectively). Compounds 1, 2, and 4 inhibited both hypoxia- and iron chelator-induced HIF-1 activation by blocking
Biochemical and behavioural effects of hypoxic hypoxia in rats: study of the protection afforded by ergot alkaloids.
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The conditioned avoidance response and the cerebral levels of dopamine and noradrenaline have been studied in control rats and in rats submitted to a hypobaric hypoxia. A protection against the effects of hypoxia was induced by both dihydroergocornine (20 microgram/kg) and dihydroergocryptine (100
Neferine, a bisbenzylisoquinoline alkaloid, offers protection against cobalt chloride-mediated hypoxia-induced oxidative stress in muscle cells.
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BACKGROUND
Neferine, a bisbenzylisoquinoline alkaloid, isolated from Nelumbo nucifera has a wide range of biological activities. Cobalt chloride (CoCl2) was known to mimic hypoxic condition. In the present study, we assessed the cytoprotective effect of neferine against CoCl2-induced oxidative
[Hypoxemia test in vegetative lability and coronary sclerosis and its influence by hydrated ergot alkaloid].
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[Effect of dihydroergot alkaloid on experimental brain anoxia. Observations by tissue culture method and isolated perfusion method (author's transl)].
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[Effects of flavones extracted from Portulaca oleracea on ability of hypoxia tolerance in mice and its mechanism].
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OBJECTIVE
To identify anti-hypoxia ingredients extracted from Portulaca oleracea and to find out the possible mechanism of its anti-hypoxia actions.
METHODS
Seventy mice were randomly divided into seven groups which were untreated (normal saline), ginsenosides-treated, polysaccharide-treated, acidic
Alkaloid delta agonist BW373U86 increases hypoxic tolerance.
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Activation of delta opioid receptors increases survival time during acute, lethal hypoxia in mice. delta Agonists therefore present a promising avenue for therapeutic application to reduce the morbidity and mortality associated with clinical hypoxia in settings such as drowning, head injury apnea,
Structure-activity relationships study of neolamellarin A and its analogues as hypoxia inducible factor-1 (HIF-1) inhibitors.
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The novel marine pyrrole alkaloid neolamellarin A derived from sponge has been shown to inhibit hypoxia-induced HIF-1 activity. In this work, we designed and synthesized neolamellarin A and its series of derivatives by a convergent synthetic strategy. The HIF-1 inhibitory activity and cytotoxicity
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