Molecular basis of impaired glycogen metabolism during ischemic stroke and hypoxia

Ischemic stroke is the combinatorial effect of many pathological processes including the loss of energy supplies, excessive intracellular calcium accumulation, oxidative stress, and inflammatory responses. The brain's ability to maintain energy demand through this process involves metabolism of...

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Veröffentlicht in:PloS one 2014-05, Vol.9 (5), p.e97570
Hauptverfasser: Hossain, Mohammed Iqbal, Roulston, Carli Lorraine, Stapleton, David Ian
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description Ischemic stroke is the combinatorial effect of many pathological processes including the loss of energy supplies, excessive intracellular calcium accumulation, oxidative stress, and inflammatory responses. The brain's ability to maintain energy demand through this process involves metabolism of glycogen, which is critical for release of stored glucose. However, regulation of glycogen metabolism in ischemic stroke remains unknown. In the present study, we investigate the role and regulation of glycogen metabolizing enzymes and their effects on the fate of glycogen during ischemic stroke. Ischemic stroke was induced in rats by peri-vascular application of the vasoconstrictor endothelin-1 and forebrains were collected at 1, 3, 6 and 24 hours post-stroke. Glycogen levels and the expression and activity of enzymes involved in glycogen metabolism were analyzed. We found elevated glycogen levels in the ipsilateral hemispheres compared with contralateral hemispheres at 6 and 24 hours (25% and 39% increase respectively; P
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The brain's ability to maintain energy demand through this process involves metabolism of glycogen, which is critical for release of stored glucose. However, regulation of glycogen metabolism in ischemic stroke remains unknown. In the present study, we investigate the role and regulation of glycogen metabolizing enzymes and their effects on the fate of glycogen during ischemic stroke. Ischemic stroke was induced in rats by peri-vascular application of the vasoconstrictor endothelin-1 and forebrains were collected at 1, 3, 6 and 24 hours post-stroke. Glycogen levels and the expression and activity of enzymes involved in glycogen metabolism were analyzed. We found elevated glycogen levels in the ipsilateral hemispheres compared with contralateral hemispheres at 6 and 24 hours (25% and 39% increase respectively; P&lt;0.05). Glycogen synthase activity and glycogen branching enzyme expression were found to be similar between the ipsilateral, contralateral, and sham control hemispheres. In contrast, the rate-limiting enzyme for glycogen breakdown, glycogen phosphorylase, had 58% lower activity (P&lt;0.01) in the ipsilateral hemisphere (24 hours post-stroke), which corresponded with a 48% reduction in cAMP-dependent protein kinase A (PKA) activity (P&lt;0.01). In addition, glycogen debranching enzyme expression 24 hours post-stroke was 77% (P&lt;0.01) and 72% lower (P&lt;0.01) at the protein and mRNA level, respectively. In cultured rat primary cerebellar astrocytes, hypoxia and inhibition of PKA activity significantly reduced glycogen phosphorylase activity and increased glycogen accumulation but did not alter glycogen synthase activity. Furthermore, elevated glycogen levels provided metabolic support to astrocytes during hypoxia. 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inhibitors</subject><subject>Cyclic AMP-Dependent Protein Kinases - metabolism</subject><subject>Diabetes</subject><subject>Endothelin 1</subject><subject>Endothelins</subject><subject>Energy</subject><subject>Energy demand</subject><subject>Energy Metabolism - drug effects</subject><subject>Enzymes</subject><subject>Gene Expression Regulation, Enzymologic - drug effects</subject><subject>Glucose</subject><subject>Glucose metabolism</subject><subject>Glycogen</subject><subject>Glycogen - metabolism</subject><subject>Glycogen branching enzyme</subject><subject>Glycogen Debranching Enzyme System - genetics</subject><subject>Glycogen phosphorylase</subject><subject>Glycogen Phosphorylase - genetics</subject><subject>Glycogen synthase</subject><subject>Glycogen synthesis</subject><subject>Hemispheres</subject><subject>Hypoglycemia</subject><subject>Hypotheses</subject><subject>Hypoxia</subject><subject>Inflammation</subject><subject>Ischemia</subject><subject>Kinases</subject><subject>Laboratory animals</subject><subject>Male</subject><subject>Metabolism</subject><subject>mRNA</subject><subject>Musculoskeletal system</subject><subject>Neurons</subject><subject>Oxidative stress</subject><subject>Pathology</subject><subject>Phosphorylase</subject><subject>Physiological aspects</subject><subject>Physiology</subject><subject>Protein kinase A</subject><subject>Protein Kinase Inhibitors - pharmacology</subject><subject>Proteins</subject><subject>Rats</subject><subject>Rats, Wistar</subject><subject>Reperfusion</subject><subject>Rodents</subject><subject>Stroke</subject><subject>Stroke - complications</subject><subject>Stroke - metabolism</subject><subject>Stroke - pathology</subject><subject>Stroke - physiopathology</subject><subject>Supply and demand</subject><subject>Surgery</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>DOA</sourceid><recordid>eNqNkluL1DAYhoso7jr6D0QLguDFjEmTHnIjLIuHgZWF9XAbvhzaZkybmrSy8-_NON1lCgqSi4Tk-d4k7_cmyXOMNpiU-O3OTb4HuxlcrzcIsTIv0YPkHDOSrYsMkYcn67PkSQg7hHJSFcXj5CyjVV7hjJ0nN5-d1XKy4FMBwYTU1anpBjBeq7Sxe-ka3aedHkE4a0KXqsmbvklNkK3ujEzD6N0PnUKv0nY_uFsDT5NHNdign83zKvn24f3Xy0_rq-uP28uLq7UsWDauocK4yJkUuFS0yrCgmuWqQEggViCGFa0x5DWTpSQYgGKoZU6lKEUJsgREVsnLo-5gXeCzHYHjPKtQSar42VWyPRLKwY4P3nTg99yB4X82nG84-NFIqznFGEtEFKuRphpYhYpSEEGRQoKJTEStd_Ntk-i0krofPdiF6PKkNy1v3C9OEcmyAkeBV7OAdz8nHcZ_PHmmGoivMn3topjsot38guLYs0ObI7X5CxWHOvQkBqI2cX9R8GZREJlR344NTCHw7Zeb_2evvy_Z1ydsq8GObXB2Go3rwxKkR1B6F4LX9b1zGPFDnu_c4Ic88znPsezFqev3RXcBJr8B7aDwWQ</recordid><startdate>20140523</startdate><enddate>20140523</enddate><creator>Hossain, Mohammed Iqbal</creator><creator>Roulston, Carli Lorraine</creator><creator>Stapleton, David Ian</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>IOV</scope><scope>ISR</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20140523</creationdate><title>Molecular basis of impaired glycogen metabolism during ischemic stroke and hypoxia</title><author>Hossain, Mohammed Iqbal ; Roulston, Carli Lorraine ; Stapleton, David Ian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c692t-a811659cb17d4821b4e95d600b096091d4f1a5f9c7c31aa41afc54cb7b7ac7a03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Accumulation</topic><topic>Alzheimer's disease</topic><topic>Alzheimers disease</topic><topic>Analysis</topic><topic>Animals</topic><topic>Astrocytes</topic><topic>Astrocytes - drug effects</topic><topic>Astrocytes - metabolism</topic><topic>Astrocytes - pathology</topic><topic>Biology and life sciences</topic><topic>Brain</topic><topic>Brain Ischemia - complications</topic><topic>Brain research</topic><topic>Breakdown</topic><topic>Calcium</topic><topic>Calcium (intracellular)</topic><topic>Cell Hypoxia - drug effects</topic><topic>Cell Survival - drug effects</topic><topic>Cerebellum</topic><topic>Combinatorial analysis</topic><topic>Cyclic AMP-Dependent Protein Kinases - antagonists &amp; 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The brain's ability to maintain energy demand through this process involves metabolism of glycogen, which is critical for release of stored glucose. However, regulation of glycogen metabolism in ischemic stroke remains unknown. In the present study, we investigate the role and regulation of glycogen metabolizing enzymes and their effects on the fate of glycogen during ischemic stroke. Ischemic stroke was induced in rats by peri-vascular application of the vasoconstrictor endothelin-1 and forebrains were collected at 1, 3, 6 and 24 hours post-stroke. Glycogen levels and the expression and activity of enzymes involved in glycogen metabolism were analyzed. We found elevated glycogen levels in the ipsilateral hemispheres compared with contralateral hemispheres at 6 and 24 hours (25% and 39% increase respectively; P&lt;0.05). Glycogen synthase activity and glycogen branching enzyme expression were found to be similar between the ipsilateral, contralateral, and sham control hemispheres. In contrast, the rate-limiting enzyme for glycogen breakdown, glycogen phosphorylase, had 58% lower activity (P&lt;0.01) in the ipsilateral hemisphere (24 hours post-stroke), which corresponded with a 48% reduction in cAMP-dependent protein kinase A (PKA) activity (P&lt;0.01). In addition, glycogen debranching enzyme expression 24 hours post-stroke was 77% (P&lt;0.01) and 72% lower (P&lt;0.01) at the protein and mRNA level, respectively. In cultured rat primary cerebellar astrocytes, hypoxia and inhibition of PKA activity significantly reduced glycogen phosphorylase activity and increased glycogen accumulation but did not alter glycogen synthase activity. Furthermore, elevated glycogen levels provided metabolic support to astrocytes during hypoxia. Our study has identified that glycogen breakdown is impaired during ischemic stroke, the molecular basis of which includes reduced glycogen debranching enzyme expression level together with reduced glycogen phosphorylase and PKA activity.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24858129</pmid><doi>10.1371/journal.pone.0097570</doi><oa>free_for_read</oa></addata></record>
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subjects Accumulation
Alzheimer's disease
Alzheimers disease
Analysis
Animals
Astrocytes
Astrocytes - drug effects
Astrocytes - metabolism
Astrocytes - pathology
Biology and life sciences
Brain
Brain Ischemia - complications
Brain research
Breakdown
Calcium
Calcium (intracellular)
Cell Hypoxia - drug effects
Cell Survival - drug effects
Cerebellum
Combinatorial analysis
Cyclic AMP-Dependent Protein Kinases - antagonists & inhibitors
Cyclic AMP-Dependent Protein Kinases - metabolism
Diabetes
Endothelin 1
Endothelins
Energy
Energy demand
Energy Metabolism - drug effects
Enzymes
Gene Expression Regulation, Enzymologic - drug effects
Glucose
Glucose metabolism
Glycogen
Glycogen - metabolism
Glycogen branching enzyme
Glycogen Debranching Enzyme System - genetics
Glycogen phosphorylase
Glycogen Phosphorylase - genetics
Glycogen synthase
Glycogen synthesis
Hemispheres
Hypoglycemia
Hypotheses
Hypoxia
Inflammation
Ischemia
Kinases
Laboratory animals
Male
Metabolism
mRNA
Musculoskeletal system
Neurons
Oxidative stress
Pathology
Phosphorylase
Physiological aspects
Physiology
Protein kinase A
Protein Kinase Inhibitors - pharmacology
Proteins
Rats
Rats, Wistar
Reperfusion
Rodents
Stroke
Stroke - complications
Stroke - metabolism
Stroke - pathology
Stroke - physiopathology
Supply and demand
Surgery
title Molecular basis of impaired glycogen metabolism during ischemic stroke and hypoxia
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