Differential skeletal muscle gene expression after upper or lower motor neuron transection
Causes of disuse atrophy include loss of upper motor neurons, which occurs in spinal cord injury (SCI) or lower motor neurons (denervation). Whereas denervation quickly results in muscle fibrillations, SCI causes delayed onset of muscle spasticity. To compare the influence of denervation or SCI on m...
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description | Causes of disuse atrophy include loss of upper motor neurons, which occurs in spinal cord injury (SCI) or lower motor neurons (denervation). Whereas denervation quickly results in muscle fibrillations, SCI causes delayed onset of muscle spasticity. To compare the influence of denervation or SCI on muscle atrophy and atrophy-related gene expression, male rats had transection of either the spinal cord or sciatic nerve and were sacrificed 3, 7, or 14 days later. Rates of atrophy increased gradually over the first week after denervation and then were constant. In contrast, atrophy after SCI peaked at 1 week, then declined sharply. The greater atrophy after SCI compared to denervation was preceded by high levels of ubiquitin ligase genes, MAFbx and MuRF1, which then also markedly declined. After denervation, however, expression of these genes remained elevated at lower levels throughout the 2-week time course. Interestingly, expression of the muscle growth factor, IGF-1 was increased at 3 days after denervation when fibrillation also peaks compared to SCI. Expression of IGF-1R, GADD45, myogenin, and Runx1 were also initially increased after denervation or SCI, with later declines in expression levels which correlated less well with rates of atrophy. Thus, there were significant time-dependent differences in muscle atrophy and MAFbx, MuRF1, and IGF-1 expression following SCI or denervation which may result from distinct temporal patterns of spontaneous muscle contractile activity due to injury to upper versus lower motor neurons. |
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Whereas denervation quickly results in muscle fibrillations, SCI causes delayed onset of muscle spasticity. To compare the influence of denervation or SCI on muscle atrophy and atrophy-related gene expression, male rats had transection of either the spinal cord or sciatic nerve and were sacrificed 3, 7, or 14 days later. Rates of atrophy increased gradually over the first week after denervation and then were constant. In contrast, atrophy after SCI peaked at 1 week, then declined sharply. The greater atrophy after SCI compared to denervation was preceded by high levels of ubiquitin ligase genes, MAFbx and MuRF1, which then also markedly declined. After denervation, however, expression of these genes remained elevated at lower levels throughout the 2-week time course. Interestingly, expression of the muscle growth factor, IGF-1 was increased at 3 days after denervation when fibrillation also peaks compared to SCI. Expression of IGF-1R, GADD45, myogenin, and Runx1 were also initially increased after denervation or SCI, with later declines in expression levels which correlated less well with rates of atrophy. Thus, there were significant time-dependent differences in muscle atrophy and MAFbx, MuRF1, and IGF-1 expression following SCI or denervation which may result from distinct temporal patterns of spontaneous muscle contractile activity due to injury to upper versus lower motor neurons.</description><identifier>ISSN: 0031-6768</identifier><identifier>EISSN: 1432-2013</identifier><identifier>DOI: 10.1007/s00424-009-0643-5</identifier><identifier>PMID: 19214561</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Animals ; Biomedical and Life Sciences ; Biomedicine ; Cell Biology ; Gene expression ; Gene Expression Regulation ; Human Physiology ; Male ; Molecular Medicine ; Motor Neurons - metabolism ; Muscle Physiology ; Muscle Proteins - metabolism ; Muscle, Skeletal - innervation ; Muscle, Skeletal - metabolism ; Neurons ; Neurosciences ; Proteins ; Rats ; Rats, Wistar ; Receptors ; Rodents ; Spinal Cord Injuries - metabolism ; Thoracic Vertebrae - injuries</subject><ispartof>Pflügers Archiv, 2009-07, Vol.458 (3), p.525-535</ispartof><rights>Springer-Verlag 2009</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-p178t-e5cbb1e059a2b5fbb0d1bafcd95e3bd6c6e89a5905aba16631608e638fa0aa6d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00424-009-0643-5$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00424-009-0643-5$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19214561$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Zeman, Richard J.</creatorcontrib><creatorcontrib>Zhao, Jingbo</creatorcontrib><creatorcontrib>Zhang, Yuangfei</creatorcontrib><creatorcontrib>Zhao, Weidong</creatorcontrib><creatorcontrib>Wen, Xialing</creatorcontrib><creatorcontrib>Wu, Yong</creatorcontrib><creatorcontrib>Pan, Jiangping</creatorcontrib><creatorcontrib>Bauman, William A.</creatorcontrib><creatorcontrib>Cardozo, Christopher</creatorcontrib><title>Differential skeletal muscle gene expression after upper or lower motor neuron transection</title><title>Pflügers Archiv</title><addtitle>Pflugers Arch - Eur J Physiol</addtitle><addtitle>Pflugers Arch</addtitle><description>Causes of disuse atrophy include loss of upper motor neurons, which occurs in spinal cord injury (SCI) or lower motor neurons (denervation). Whereas denervation quickly results in muscle fibrillations, SCI causes delayed onset of muscle spasticity. To compare the influence of denervation or SCI on muscle atrophy and atrophy-related gene expression, male rats had transection of either the spinal cord or sciatic nerve and were sacrificed 3, 7, or 14 days later. Rates of atrophy increased gradually over the first week after denervation and then were constant. In contrast, atrophy after SCI peaked at 1 week, then declined sharply. The greater atrophy after SCI compared to denervation was preceded by high levels of ubiquitin ligase genes, MAFbx and MuRF1, which then also markedly declined. After denervation, however, expression of these genes remained elevated at lower levels throughout the 2-week time course. Interestingly, expression of the muscle growth factor, IGF-1 was increased at 3 days after denervation when fibrillation also peaks compared to SCI. Expression of IGF-1R, GADD45, myogenin, and Runx1 were also initially increased after denervation or SCI, with later declines in expression levels which correlated less well with rates of atrophy. Thus, there were significant time-dependent differences in muscle atrophy and MAFbx, MuRF1, and IGF-1 expression following SCI or denervation which may result from distinct temporal patterns of spontaneous muscle contractile activity due to injury to upper versus lower motor neurons.</description><subject>Animals</subject><subject>Biomedical and Life Sciences</subject><subject>Biomedicine</subject><subject>Cell Biology</subject><subject>Gene expression</subject><subject>Gene Expression Regulation</subject><subject>Human Physiology</subject><subject>Male</subject><subject>Molecular Medicine</subject><subject>Motor Neurons - metabolism</subject><subject>Muscle Physiology</subject><subject>Muscle Proteins - metabolism</subject><subject>Muscle, Skeletal - innervation</subject><subject>Muscle, Skeletal - metabolism</subject><subject>Neurons</subject><subject>Neurosciences</subject><subject>Proteins</subject><subject>Rats</subject><subject>Rats, Wistar</subject><subject>Receptors</subject><subject>Rodents</subject><subject>Spinal Cord Injuries - metabolism</subject><subject>Thoracic Vertebrae - injuries</subject><issn>0031-6768</issn><issn>1432-2013</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</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><recordid>eNpFkE1LxDAQhoMo7rr6A7xI8R6dJE3aHmVdP2DBi168hKSdLl37ZZKi_nuz7IqXmRfm4R14CLlkcMMAslsPkPKUAhQUVCqoPCJzlgpOOTBxTOYAglGVqXxGzrzfAgBPc35KZqzgLJWKzcn7fVPX6LAPjWkT_4Ethhi6yZctJhvsMcHv0aH3zdAnpg7okmkc4xxc0g5fMXRDiLnHyUUiONN7LEOkz8lJbVqPF4e9IG8Pq9flE12_PD4v79Z0ZFkeKMrSWoYgC8OtrK2FillTl1UhUdhKlQrzwsgCpLGGKSWYghyVyGsDxqhKLMj1vnd0w-eEPujtMLk-vtQ8GgCeZxChqwM02Q4rPbqmM-5H_5mIAN8DPp76Dbr_FgZ6p1vvdeuoW-90ayl-Ab6VcjQ</recordid><startdate>20090701</startdate><enddate>20090701</enddate><creator>Zeman, Richard J.</creator><creator>Zhao, Jingbo</creator><creator>Zhang, Yuangfei</creator><creator>Zhao, Weidong</creator><creator>Wen, Xialing</creator><creator>Wu, Yong</creator><creator>Pan, Jiangping</creator><creator>Bauman, William A.</creator><creator>Cardozo, Christopher</creator><general>Springer-Verlag</general><general>Springer Nature B.V</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>3V.</scope><scope>7QP</scope><scope>7TK</scope><scope>7TS</scope><scope>7X7</scope><scope>7XB</scope><scope>88A</scope><scope>88E</scope><scope>8AO</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M7P</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope></search><sort><creationdate>20090701</creationdate><title>Differential skeletal muscle gene expression after upper or lower motor neuron transection</title><author>Zeman, Richard J. ; 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Whereas denervation quickly results in muscle fibrillations, SCI causes delayed onset of muscle spasticity. To compare the influence of denervation or SCI on muscle atrophy and atrophy-related gene expression, male rats had transection of either the spinal cord or sciatic nerve and were sacrificed 3, 7, or 14 days later. Rates of atrophy increased gradually over the first week after denervation and then were constant. In contrast, atrophy after SCI peaked at 1 week, then declined sharply. The greater atrophy after SCI compared to denervation was preceded by high levels of ubiquitin ligase genes, MAFbx and MuRF1, which then also markedly declined. After denervation, however, expression of these genes remained elevated at lower levels throughout the 2-week time course. Interestingly, expression of the muscle growth factor, IGF-1 was increased at 3 days after denervation when fibrillation also peaks compared to SCI. Expression of IGF-1R, GADD45, myogenin, and Runx1 were also initially increased after denervation or SCI, with later declines in expression levels which correlated less well with rates of atrophy. Thus, there were significant time-dependent differences in muscle atrophy and MAFbx, MuRF1, and IGF-1 expression following SCI or denervation which may result from distinct temporal patterns of spontaneous muscle contractile activity due to injury to upper versus lower motor neurons.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><pmid>19214561</pmid><doi>10.1007/s00424-009-0643-5</doi><tpages>11</tpages></addata></record> |
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subjects | Animals Biomedical and Life Sciences Biomedicine Cell Biology Gene expression Gene Expression Regulation Human Physiology Male Molecular Medicine Motor Neurons - metabolism Muscle Physiology Muscle Proteins - metabolism Muscle, Skeletal - innervation Muscle, Skeletal - metabolism Neurons Neurosciences Proteins Rats Rats, Wistar Receptors Rodents Spinal Cord Injuries - metabolism Thoracic Vertebrae - injuries |
title | Differential skeletal muscle gene expression after upper or lower motor neuron transection |
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