Downregulation of Homer1b/c in SOD1 G93A Models of ALS: A Novel Mechanism of Neuroprotective Effect of Lithium and Valproic Acid
Background: Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in n...
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Published in | International journal of molecular sciences Vol. 17; no. 12; p. 2129 |
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Abstract | Background: Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS. Results: In vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice. Conclusion: The suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS. |
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AbstractList | Background: Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS. Results: In vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice. Conclusion: The suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS. Mutations in the Cu/Zn superoxide dismutase ( ) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS. In vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice. The suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS. Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS.BACKGROUNDMutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS.In vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice.RESULTSIn vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice.The suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS.CONCLUSIONThe suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS. Background: Mutations in the Cu/Zn superoxide dismutase ( SOD1 ) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been elucidated yet. Homer family protein Homer1b/c is expressed widely in the central nervous system and plays important roles in neurological diseases. In this study, we explored whether Homer1b/c was involved in SOD1 mutation-linked ALS. Results: In vitro studies showed that the SOD1 G93A mutation induced an increase of Homer1b/c expression at both the mRNA and protein levels in NSC34 cells. Knockdown of Homer1b/c expression using its short interfering RNA (siRNA) (si-Homer1) protected SOD1 G93A NSC34 cells from apoptosis. The expressions of Homer1b/c and apoptosis-related protein Bax were also suppressed, while Bcl-2 was increased by lithium and valproic acid (VPA) in SOD1 G93A NSC34 cells. In vivo, both the mRNA and protein levels of Homer1b/c were increased significantly in the lumbar spinal cord in SOD1 G93A transgenic mice compared with wild type (WT) mice. Moreover, lithium and VPA treatment suppressed the expression of Homer1b/c in SOD1 G93A mice. Conclusion: The suppression of SOD1 G93A mutation-induced Homer1b/c upregulation protected ALS against neuronal apoptosis, which is a novel mechanism of the neuroprotective effect of lithium and VPA. This study provides new insights into pathogenesis and treatment of ALS. |
Author | Yin, Xiang Zhang, Chun-Ting Jiang, Hong-Quan Jiang, Hai-Zhi Yang, Yue-Qing Wang, Ying Wang, Shu-Yu Wang, Xu-Dong Qi, Yan Feng, Hong-Lin Wang, Jing Wang, Tian-Hang |
AuthorAffiliation | Department of Neurology, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, China; jianghz@hrbmu.edu.cn (H.-Z.J.); WangS319@hotmail.com (S.-Y.W.); YinXiang15@hotmail.com (X.Y.); jianghongquan321@hotmail.com (H.-Q.J.); wangxudonghlj@hotmail.com (X.-D.W.); hebgdwangjing@163.com (J.W.); libu979@126.com (T.-H.W.); qiswallow21@sohu.com (Y.Q.); yangyueqing714@sina.com (Y.-Q.Y.); try101_80@163.com (Y.W.); hoat77@sina.com (C.-T.Z.) |
AuthorAffiliation_xml | – name: Department of Neurology, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, China; jianghz@hrbmu.edu.cn (H.-Z.J.); WangS319@hotmail.com (S.-Y.W.); YinXiang15@hotmail.com (X.Y.); jianghongquan321@hotmail.com (H.-Q.J.); wangxudonghlj@hotmail.com (X.-D.W.); hebgdwangjing@163.com (J.W.); libu979@126.com (T.-H.W.); qiswallow21@sohu.com (Y.Q.); yangyueqing714@sina.com (Y.-Q.Y.); try101_80@163.com (Y.W.); hoat77@sina.com (C.-T.Z.) |
Author_xml | – sequence: 1 givenname: Hai-Zhi surname: Jiang fullname: Jiang, Hai-Zhi – sequence: 2 givenname: Shu-Yu surname: Wang fullname: Wang, Shu-Yu – sequence: 3 givenname: Xiang surname: Yin fullname: Yin, Xiang – sequence: 4 givenname: Hong-Quan surname: Jiang fullname: Jiang, Hong-Quan – sequence: 5 givenname: Xu-Dong surname: Wang fullname: Wang, Xu-Dong – sequence: 6 givenname: Jing surname: Wang fullname: Wang, Jing – sequence: 7 givenname: Tian-Hang surname: Wang fullname: Wang, Tian-Hang – sequence: 8 givenname: Yan surname: Qi fullname: Qi, Yan – sequence: 9 givenname: Yue-Qing surname: Yang fullname: Yang, Yue-Qing – sequence: 10 givenname: Ying surname: Wang fullname: Wang, Ying – sequence: 11 givenname: Chun-Ting surname: Zhang fullname: Zhang, Chun-Ting – sequence: 12 givenname: Hong-Lin surname: Feng fullname: Feng, Hong-Lin |
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Keywords | Homer1b/c SOD1 G93A lithium valproic acid (VPA) amyotrophic lateral sclerosis |
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Snippet | Background: Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms... Mutations in the Cu/Zn superoxide dismutase ( ) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not been... Mutations in the Cu/Zn superoxide dismutase (SOD1) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms have not... Background: Mutations in the Cu/Zn superoxide dismutase ( SOD1 ) gene have been linked to amyotrophic lateral sclerosis (ALS). However, the molecular... |
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SubjectTerms | Amyotrophic lateral sclerosis Amyotrophic Lateral Sclerosis - genetics Amyotrophic Lateral Sclerosis - pathology Amyotrophic Lateral Sclerosis - therapy Animals Apoptosis - genetics Cell Line Genetic Predisposition to Disease Homer Scaffolding Proteins - antagonists & inhibitors Homer Scaffolding Proteins - biosynthesis Homer Scaffolding Proteins - genetics Humans Lithium Lithium - therapeutic use Mice Mice, Transgenic Mutation Proto-Oncogene Proteins c-bcl-2 - metabolism RNA Interference RNA, Small Interfering - genetics Superoxide Dismutase - genetics Valproic Acid - therapeutic use |
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Title | Downregulation of Homer1b/c in SOD1 G93A Models of ALS: A Novel Mechanism of Neuroprotective Effect of Lithium and Valproic Acid |
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