Oral administration of (-)catechin protects against ischemia-reperfusion-induced neuronal death in the gerbil

Inanami, Osamu; Watanabe, Yoshihisa; Syuto, Bunei; Nakano, Miki; Tsuji, Masahisa; Kuwabara, Mikinori

doi:10.1080/10715769800300401

Cited by 136 publications

(81 citation statements)

References 22 publications

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“…In vivo studies in animals demonstrate protective effects of the flavonoids epicatechin and quercetin against ischemia/reperfusion-induced neuronal injury [86,187]. Furthermore, flavonoids showed protective effects against an increase in brain lipid peroxidation following Vitamin E deprivation [219], attenuated neuronal damage induced by ethanol administration [113,199] and reduced O-ethyl-S,Sdipropyl phosphorodithioate-induced neurotoxicity in mice [163].…”

Section: Flavonoids: Neuroprotective Agents In Vivo and In Vitro?mentioning

confidence: 99%

MAPK signaling in neurodegeneration: influences of flavonoids and of nitric oxide

Schroeter

Boyd

Spencer

et al. 2002

Neurobiology of Aging

308

178

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Oxidative and nitrosative stress is increasingly associated with the pathology of neurodegeneration and aging. The molecular mechanisms underlying oxidative/nitrosative stress-induced neuronal damage are emerging and appear to involve a mode of death in which mitogen-activated protein kinase (MAPK) signaling pathways are strongly implicated. Thus, attention is turning towards the modulation of intracellular signaling as a therapeutic approach against neurodegeneration. Both endogenous and dietary agents have been suggested as potent modulators of intracellular signal transduction, e.g. nitric oxide and flavonoids, respectively. This review addresses recent findings on the biological effects of flavonoids and nitric oxide in neurodegeneration and aims to elucidate the rationale for their prospective use as modulators of cellular signal transduction. © 2002 Elsevier Science Inc. All rights reserved.Keywords: Apoptosis; Oxidative stress; Neuron; Flavonoids; MAP kinase; JNK; ERK; Epicatechin; Nitric oxide; Mitochondria; Redox status; Polyphenols Abbreviations: AKT, serine/threonine kinase (also known as protein kinase B); AP-1, activator protein-1; Apaf-1, apoptosis protease activating factor-1; ASK1, apoptosis signal-regulating kinase-1; Bad, Bcl-2/BclX Lassociated death promoting protein; Bax, pro-apoptotic protein of the Bcl-2 family; Bcl-2, B-cell lymphoma 2: protein with anti-apoptotic properties; BclX L , long form of Bclx: anti-apoptotic protein of the Bcl-2 family; Caspase, cysteinyl aspartic acid-protease; c-Jun, mammalian equivalent of Jun: part of the AP-1 transcription complex; CREB, cAMP response element binding protein; DIABLO/smac, mitochondria-related pro-apoptotic protein: inhibits XIAP; ERK1/2, extracellular signal-related kinase; Fas, CD95: member of the TNF receptor family; GSHST, glutathione Stransferase; JNK, c-Jun amino-terminal kinase; MAPK, mitogen-activated protein kinase; MAPKK, MAPK kinase; MAPKKK, MAPKK kinase; MEK1/2, ERK1/2-specific MAPKK; MKK4/7, JNK-specific MAPKK; MSK1, mitogen-and stress-activated kinase-1; NF-B, nuclear factor of immunoglobulin k locus in B-cells; ONOO − , peroxynitrite anion; p53, pro-apoptotic tumor suppressor gene product; PI3-kinase, phosphoinositol 3-kinase; Ras, small G-protein; RNS, reactive nitrogen species; ROS, reactive oxygen species; RSK, pp90 ribosomal S6 kinase; SAPK, stressactivated protein kinase; XIAP, X-linked inhibitor of apoptosis: inhibits the activation of caspase-9

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Section: Flavonoids: Neuroprotective Agents In Vivo and In Vitro?mentioning

confidence: 99%

MAPK signaling in neurodegeneration: influences of flavonoids and of nitric oxide

Schroeter

Boyd

Spencer

et al. 2002

Neurobiology of Aging

308

178

View full text Add to dashboard Cite

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“…Dietary supplementation studies, in humans and animals, using flavonoid-rich plant or food extracts have highlighted their potential to influence cognition and learning [60,70,95,175,183,194,197], presumably by protecting vulnerable neurons, enhancing existing neuronal function or by stimulating neuronal regeneration. Their neuroprotective potential has been shown in both oxidative stress- [77] and Ab-induced-neuronal death models [109]. Evidence also supports the beneficial and neuromodulatory effects of flavonoid-rich ginkgo biloba extracts, particularly in connection with agerelated dementias and Alzheimer's disease [14,109,203].…”

mentioning

confidence: 95%

The interactions of flavonoids within neuronal signalling pathways

2007

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Emerging evidence suggests that dietary phytochemicals, in particular flavonoids, may exert beneficial effects in the central nervous system by protecting neurons against stress-induced injury, by suppressing neuroinflammation and by promoting neurocognitive performance, through changes in synaptic plasticity. It is likely that flavonoids exert such effects in neurons, through selective actions on different components within a number of protein kinase and lipid kinase signalling cascades, such as phosphatidylinositol-3 kinase (PI3K)/Akt, protein kinase C and mitogen-activated protein kinase. This review details the potential inhibitory or stimulatory actions of flavonoids within these pathways, and describes how such interactions are likely to affect cellular function through changes in the activation state of target molecules and/or by modulating gene expression. Although, precise sites of action are presently unknown, their abilities to: (1) bind to ATP binding sites on enzymes and receptors; (2) modulate the activity of kinases directly; (3) affect the function of important phosphatases; (4) preserve neuronal Ca 2+ homeostasis; and (5) modulate signalling cascades lying downstream of kinases, are explored. Future research directions are outlined in relation to their precise site(s) of action within the signalling pathways and the sequence of events that allow them to regulate neuronal function in the central nervous system.

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“…Valuable protective influences of flavonoids have been documented in preventing brain ischaemia/reperfusion injury [21] in the inhibition of beta amyloid involved in Alzheimer's disease [22], and in cognitive declines [23]. Quercetin exerts immunomodulatory effects in the management of multiple sclerosis (MS), (an autoimmune disease), characterized by CNS inflammation and axonal injury [24].…”

Section: Introductionmentioning

confidence: 99%

Role of Bioflavonoid Quercetin on Expression of Urea Cycle Enzymes, Astrocytic and Inflammatory Markers in Hyperammonemic Rats

et al. 2016

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This study evaluates the role of quercetin on the expression of urea cycle enzymes, astrocytic, neuronal and inflammatory markers in hyperammonemic rats. Hyperammonemia (provoked by intraperitonial injections of (ammonium chloride-100 mg/kg b.w for 56 days), showed diminished expression of urea cycle enzymes [carbamyl phosphate synthetase-1 (CPS-1), ornithine transcarbamylase (OTC), argininosuccinate synthetase (ASS) and arginase (ARG)] in liver and decreased expression of neuronal and astrocytic markers-glutamine synthase (GS) and phosphate activated glutaminase (PAG) in brain and increased expression of brain inflammatory markers such as interleukin 6 (IL6), inducible nitric oxide synthase (iNOS) and nuclear transcription factor kappa B (NF-jB) (by western blot analysis) and exhibited downregulated expression of soluble guanylate cyclase (sGC), glial fibrillary acidic protein (GFAP) in brain and ASS in liver investigated (by RT-PCR). Oral treatment of quercetin (50 mg/kg b.w) to hyperammonemic rats (1) increased the expression of urea cycle enzymes (CPS-1, OTC, ASS and ARG), neuronal and astrocytic markers (GS and PAG) (2) decreased the expression of IL6, iNOS and NF-jB and (3) upregulated mRNA expression of SGC, GFAP and ASS. Our results specify that quercetin's antihyperammonemic effects could be through its, anti-inflammatory, neuroprotective and hepatoprotective effects.

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Oral administration of (-)catechin protects against ischemia-reperfusion-induced neuronal death in the gerbil

Cited by 136 publications

References 22 publications

MAPK signaling in neurodegeneration: influences of flavonoids and of nitric oxide

MAPK signaling in neurodegeneration: influences of flavonoids and of nitric oxide

The interactions of flavonoids within neuronal signalling pathways

Role of Bioflavonoid Quercetin on Expression of Urea Cycle Enzymes, Astrocytic and Inflammatory Markers in Hyperammonemic Rats

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