Withanolide A prevents neurodegeneration by modulating hippocampal glutathione biosynthesis during hypoxia

Withania somnifera root extract has been used traditionally in ayurvedic system of medicine as a memory enhancer. Present study explores the ameliorative effect of withanolide A, a major component of withania root extract and its molecular mechanism against hypoxia induced memory impairment. Withano...

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Veröffentlicht in:PloS one 2014-10, Vol.9 (10), p.e105311
Hauptverfasser: Baitharu, Iswar, Jain, Vishal, Deep, Satya Narayan, Shroff, Sabita, Sahu, Jayanta Kumar, Naik, Pradeep Kumar, Ilavazhagan, Govindasamy
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container_title PloS one
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creator Baitharu, Iswar
Jain, Vishal
Deep, Satya Narayan
Shroff, Sabita
Sahu, Jayanta Kumar
Naik, Pradeep Kumar
Ilavazhagan, Govindasamy
description Withania somnifera root extract has been used traditionally in ayurvedic system of medicine as a memory enhancer. Present study explores the ameliorative effect of withanolide A, a major component of withania root extract and its molecular mechanism against hypoxia induced memory impairment. Withanolide A was administered to male Sprague Dawley rats before a period of 21 days pre-exposure and during 07 days of exposure to a simulated altitude of 25,000 ft. Glutathione level and glutathione dependent free radicals scavenging enzyme system, ATP, NADPH level, γ-glutamylcysteinyl ligase (GCLC) activity and oxidative stress markers were assessed in the hippocampus. Expression of apoptotic marker caspase 3 in hippocampus was investigated by immunohistochemistry. Transcriptional alteration and expression of GCLC and Nuclear factor (erythroid-derived 2)-related factor 2 (Nrf2) were investigated by real time PCR and immunoblotting respectively. Exposure to hypobaric hypoxia decreased reduced glutathione (GSH) level and impaired reduced gluatathione dependent free radical scavenging system in hippocampus resulting in elevated oxidative stress. Supplementation of withanolide A during hypoxic exposure increased GSH level, augmented GSH dependent free radicals scavenging system and decreased the number of caspase and hoescht positive cells in hippocampus. While withanolide A reversed hypoxia mediated neurodegeneration, administration of buthionine sulfoximine along with withanolide A blunted its neuroprotective effects. Exogenous administration of corticosterone suppressed Nrf2 and GCLC expression whereas inhibition of corticosterone synthesis upregulated Nrf2 as well as GCLC. Thus present study infers that withanolide A reduces neurodegeneration by restoring hypoxia induced glutathione depletion in hippocampus. Further, Withanolide A increases glutathione biosynthesis in neuronal cells by upregulating GCLC level through Nrf2 pathway in a corticosterone dependenet manner.
doi_str_mv 10.1371/journal.pone.0105311
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Present study explores the ameliorative effect of withanolide A, a major component of withania root extract and its molecular mechanism against hypoxia induced memory impairment. Withanolide A was administered to male Sprague Dawley rats before a period of 21 days pre-exposure and during 07 days of exposure to a simulated altitude of 25,000 ft. Glutathione level and glutathione dependent free radicals scavenging enzyme system, ATP, NADPH level, γ-glutamylcysteinyl ligase (GCLC) activity and oxidative stress markers were assessed in the hippocampus. Expression of apoptotic marker caspase 3 in hippocampus was investigated by immunohistochemistry. Transcriptional alteration and expression of GCLC and Nuclear factor (erythroid-derived 2)-related factor 2 (Nrf2) were investigated by real time PCR and immunoblotting respectively. Exposure to hypobaric hypoxia decreased reduced glutathione (GSH) level and impaired reduced gluatathione dependent free radical scavenging system in hippocampus resulting in elevated oxidative stress. Supplementation of withanolide A during hypoxic exposure increased GSH level, augmented GSH dependent free radicals scavenging system and decreased the number of caspase and hoescht positive cells in hippocampus. While withanolide A reversed hypoxia mediated neurodegeneration, administration of buthionine sulfoximine along with withanolide A blunted its neuroprotective effects. Exogenous administration of corticosterone suppressed Nrf2 and GCLC expression whereas inhibition of corticosterone synthesis upregulated Nrf2 as well as GCLC. Thus present study infers that withanolide A reduces neurodegeneration by restoring hypoxia induced glutathione depletion in hippocampus. 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Present study explores the ameliorative effect of withanolide A, a major component of withania root extract and its molecular mechanism against hypoxia induced memory impairment. Withanolide A was administered to male Sprague Dawley rats before a period of 21 days pre-exposure and during 07 days of exposure to a simulated altitude of 25,000 ft. Glutathione level and glutathione dependent free radicals scavenging enzyme system, ATP, NADPH level, γ-glutamylcysteinyl ligase (GCLC) activity and oxidative stress markers were assessed in the hippocampus. Expression of apoptotic marker caspase 3 in hippocampus was investigated by immunohistochemistry. Transcriptional alteration and expression of GCLC and Nuclear factor (erythroid-derived 2)-related factor 2 (Nrf2) were investigated by real time PCR and immunoblotting respectively. 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drug effects</topic><topic>Biology and Life Sciences</topic><topic>Biosynthesis</topic><topic>Brain research</topic><topic>Buthionine sulfoximine</topic><topic>Caspase</topic><topic>Caspase 3 - metabolism</topic><topic>Caspase-3</topic><topic>Corticosterone</topic><topic>Corticosterone - pharmacology</topic><topic>Dopamine</topic><topic>Enzymes</topic><topic>Exposure</topic><topic>Free radicals</topic><topic>Free Radicals - metabolism</topic><topic>Gene expression</topic><topic>Glutamate-Cysteine Ligase - genetics</topic><topic>Glutamate-Cysteine Ligase - metabolism</topic><topic>Glutathione</topic><topic>Glutathione - biosynthesis</topic><topic>Hippocampus</topic><topic>Hippocampus - drug effects</topic><topic>Hippocampus - metabolism</topic><topic>Hypoxia</topic><topic>Hypoxia - metabolism</topic><topic>Immunoblotting</topic><topic>Immunohistochemistry</topic><topic>Ligases</topic><topic>Lipid peroxidation</topic><topic>Male</topic><topic>Maze Learning - drug effects</topic><topic>Memory</topic><topic>Memory - 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Present study explores the ameliorative effect of withanolide A, a major component of withania root extract and its molecular mechanism against hypoxia induced memory impairment. Withanolide A was administered to male Sprague Dawley rats before a period of 21 days pre-exposure and during 07 days of exposure to a simulated altitude of 25,000 ft. Glutathione level and glutathione dependent free radicals scavenging enzyme system, ATP, NADPH level, γ-glutamylcysteinyl ligase (GCLC) activity and oxidative stress markers were assessed in the hippocampus. Expression of apoptotic marker caspase 3 in hippocampus was investigated by immunohistochemistry. Transcriptional alteration and expression of GCLC and Nuclear factor (erythroid-derived 2)-related factor 2 (Nrf2) were investigated by real time PCR and immunoblotting respectively. Exposure to hypobaric hypoxia decreased reduced glutathione (GSH) level and impaired reduced gluatathione dependent free radical scavenging system in hippocampus resulting in elevated oxidative stress. Supplementation of withanolide A during hypoxic exposure increased GSH level, augmented GSH dependent free radicals scavenging system and decreased the number of caspase and hoescht positive cells in hippocampus. While withanolide A reversed hypoxia mediated neurodegeneration, administration of buthionine sulfoximine along with withanolide A blunted its neuroprotective effects. Exogenous administration of corticosterone suppressed Nrf2 and GCLC expression whereas inhibition of corticosterone synthesis upregulated Nrf2 as well as GCLC. Thus present study infers that withanolide A reduces neurodegeneration by restoring hypoxia induced glutathione depletion in hippocampus. Further, Withanolide A increases glutathione biosynthesis in neuronal cells by upregulating GCLC level through Nrf2 pathway in a corticosterone dependenet manner.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>25310001</pmid><doi>10.1371/journal.pone.0105311</doi><oa>free_for_read</oa></addata></record>
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identifier ISSN: 1932-6203
ispartof PloS one, 2014-10, Vol.9 (10), p.e105311
issn 1932-6203
1932-6203
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source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; Public Library of Science (PLoS)
subjects Animals
Antioxidants
Apoptosis
Apoptosis - drug effects
Biology and Life Sciences
Biosynthesis
Brain research
Buthionine sulfoximine
Caspase
Caspase 3 - metabolism
Caspase-3
Corticosterone
Corticosterone - pharmacology
Dopamine
Enzymes
Exposure
Free radicals
Free Radicals - metabolism
Gene expression
Glutamate-Cysteine Ligase - genetics
Glutamate-Cysteine Ligase - metabolism
Glutathione
Glutathione - biosynthesis
Hippocampus
Hippocampus - drug effects
Hippocampus - metabolism
Hypoxia
Hypoxia - metabolism
Immunoblotting
Immunohistochemistry
Ligases
Lipid peroxidation
Male
Maze Learning - drug effects
Memory
Memory - drug effects
NADP
Nerve Degeneration - drug therapy
Nerve Degeneration - etiology
Nerve Degeneration - metabolism
Neurobiology
Neurodegeneration
Neuroprotection
Neuroprotective Agents - pharmacology
Neuroprotective Agents - therapeutic use
Neurosciences
NF-E2-Related Factor 2 - genetics
NF-E2-Related Factor 2 - metabolism
Nitric oxide
Oxidative stress
Oxidative Stress - drug effects
Physiological aspects
Physiology
Rats
Rats, Sprague-Dawley
Reactive Oxygen Species - metabolism
Receptors, Glucocorticoid - genetics
Receptors, Glucocorticoid - metabolism
Receptors, Mineralocorticoid - genetics
Receptors, Mineralocorticoid - metabolism
Rodents
Scavenging
Superoxide Dismutase - metabolism
Supplements
Thiols
Transcription
Transcription, Genetic - drug effects
Withania somnifera
Withanolides - pharmacology
Withanolides - therapeutic use
Zoology
title Withanolide A prevents neurodegeneration by modulating hippocampal glutathione biosynthesis during hypoxia
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