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Beta-Site Amyloid Precursor Protein-Cleaving Enzyme Inhibition Partly Restores Sevoflurane-Induced Deficits on Synaptic Plasticity and Spine Loss. Int J Mol Sci 2022; 23:ijms23126637. [PMID: 35743082 PMCID: PMC9223703 DOI: 10.3390/ijms23126637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/31/2022] [Accepted: 06/09/2022] [Indexed: 11/28/2022] Open
Abstract
Evidence indicates that inhalative anesthetics enhance the β-site amyloid precursor protein (APP)-cleaving enzyme (BACE) activity, increase amyloid beta 1-42 (Aβ1–42) aggregation, and modulate dendritic spine dynamics. However, the mechanisms of inhalative anesthetics on hippocampal dendritic spine plasticity and BACE-dependent APP processing remain unclear. In this study, hippocampal slices were incubated with equipotent isoflurane (iso), sevoflurane (sevo), or xenon (Xe) with/without pretreatment of the BACE inhibitor LY2886721 (LY). Thereafter, CA1 dendritic spine density, APP processing-related molecule expressions, nectin-3 levels, and long-term potentiation (LTP) were tested. The nectin-3 downregulation on LTP and dendritic spines were evaluated. Sevo treatment increased hippocampal mouse Aβ1–42 (mAβ1–42), abolished CA1-LTP, and decreased spine density and nectin-3 expressions in the CA1 region. Furthermore, CA1-nectin-3 knockdown blocked LTP and reduced spine density. Iso treatment decreased spine density and attenuated LTP. Although Xe blocked LTP, it did not affect spine density, mAβ1–42, or nectin-3. Finally, antagonizing BACE activity partly restored sevo-induced deficits. Taken together, our study suggests that sevo partly elevates BACE activity and interferes with synaptic remodeling, whereas iso mildly modulates synaptic changes in the CA1 region of the hippocampus. On the other hand, Xe does not alternate dendritic spine remodeling.
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Huang XW, Xu Y, Sui X, Lin H, Xu JM, Han D, Ye DD, Lv GF, Liu YX, Qu XB, Duan MH. Scutellarein suppresses Aβ-induced memory impairment via inhibition of the NF-κB pathway in vivo and in vitro. Oncol Lett 2019; 17:5581-5589. [PMID: 31186780 PMCID: PMC6507344 DOI: 10.3892/ol.2019.10274] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 02/22/2019] [Indexed: 12/26/2022] Open
Abstract
The flavonoid compound scutellarin (Scu) is a traditional Chinese medicine used to treat a variety of diseases; however, the use of scutellarein (Scue), the hydrolysate of Scu, and its mechanisms of action in Alzheimer's disease (AD) have not been fully elucidated. In the present study, the effects of Scue on amyloid β (Aβ)-induced AD-like pathology were investigated. An in vitro model of inflammation and an aged rat model were used to confirm the effects of Scue. In vitro MTT assays and flow cytometry were used to assess the effects of Scue on cell viability and apoptosis, respectively. A Morris water maze was used to evaluate spatial learning and memory, and the levels of Aβ deposition, superoxide dismutase, malondialdehyde, apoptosis, neuro-inflammatory factors and nuclear factor-κB (NF-κB) activation in hippocampal tissues in vivo were measured to determine the effect of Scue in AD. Scue may be protective, as it decreased the apoptosis of hippocampal cells in vitro, inhibited Aβ-induced cognitive impairment, suppressed hippocampal neuro-inflammation and suppressed activation of NF-κB in vivo. Therefore, Scue may be a useful agent for the treatment of Aβ-associated pathology in the central nervous system through inhibition of the protein kinase B/NF-κB signaling pathway and thus, future studies are required to investigate the efficacy of Scue in patients with AD.
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Affiliation(s)
- Xiao-Wei Huang
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Yan Xu
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Xin Sui
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - He Lin
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Jia-Ming Xu
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Dong Han
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Dou-Dan Ye
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Guang-Fu Lv
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Yue-Xin Liu
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Xiao-Bo Qu
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
| | - Ming-Hua Duan
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun, Jilin 130107, P.R. China
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Abstract
Exposure to anesthesia and surgery has been hypothesized to increase the risk of developing Alzheimer's disease (AD). While the exact pathogenesis of AD remains unknown, it potentially involves specific proteins (eg, amyloid beta and tau) and neuroinflammation. A growing body of preclinical evidence also suggests that anesthetic agents interact with the components that mediate AD neuropathology at multiple levels. However, it remains unclear whether anesthesia and surgery are associated with an increased risk of AD in humans. To date, there have not been randomized controlled trials to provide evidence for such a causal relationship. Besides, observational studies showed inconsistent results. A meta-analysis of 15 case-control studies revealed no statistically significant association between general anesthesia and the development of AD (pooled odds ratio [OR] =1.05; P=0.43). However, a few retrospective cohort studies have demonstrated that exposure to anesthesia and surgery is associated with an increased risk of AD. Thus, well-designed studies with longer follow-up periods are still needed to define the role of anesthesia in relation to the development of AD.
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Affiliation(s)
- Chih-Wen Yang
- Department of Neurology, National Yang-Ming University Hospital, Ilan, Taipei, Taiwan, Republic of China ; National Yang-Ming University School of Medicine, Taipei, Taiwan, Republic of China
| | - Jong-Ling Fuh
- National Yang-Ming University School of Medicine, Taipei, Taiwan, Republic of China ; Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China
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Duan MH, Wang LN, Jiang YH, Pei YY, Guan DD, Qiu ZD. Angelica sinensis reduced Aβ-induced memory impairment in rats. J Drug Target 2015; 24:340-7. [PMID: 26821843 DOI: 10.3109/1061186x.2015.1077848] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Studies have shown that Angelica sinensis (JiLin AoDong Medicine Industry Groups Co., Ltd., Jilin, China) root (AS) ameliorates various diseases, although its effects in Alzheimer's disease (AD) have not been elucidated. PURPOSE The present study examined the effects of AS in a rat model of AD. METHODS Positional Aβ injections were administered to rats. The behavioral effects of AS administration were examined using the Morris water maze, and the molecular effects on gene and protein expression, and apoptosis, were determined. RESULTS AS reversed the social behavioral impairments observed in this rat model of Aβ-induced memory impairment. Western blot analysis also revealed lower hippocampal levels of Aβ and β-site amyloid precursor protein-cleaving enzyme. Terminal deoxynucleotidyl transferased UTP nick end labeling indicated that AS significantly inhibited apoptosis via effects on nuclear factor kappa B (NF-κB) signaling. Real-time PCR, enzyme-linked immunosorbent assay, and immunohistochemical staining indicated that AS effectively inhibited inflammation and upregulated expression of glial cell line-derived neurotrophic factor (GDNF) and brain-derived neurotrophic factor (BDNF) in the hippocampus of this rat AD model. DISCUSSION AS effectively rescued the symptoms of AD in a rat model by inhibiting inflammation, apoptosis, and NF-κB signaling pathway. CONCLUSION These findings suggested that AS could provide a potential drug for the treatment of AD.
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Affiliation(s)
- Ming-Hua Duan
- a Changchun University of Chinese Medicine , Changchun , China
| | - Li-Na Wang
- a Changchun University of Chinese Medicine , Changchun , China
| | - Yan-Hong Jiang
- a Changchun University of Chinese Medicine , Changchun , China
| | - Ying-Yuan Pei
- a Changchun University of Chinese Medicine , Changchun , China
| | - Dong-Dong Guan
- a Changchun University of Chinese Medicine , Changchun , China
| | - Zhi-Dong Qiu
- a Changchun University of Chinese Medicine , Changchun , China
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Jiang J, Jiang H. Effect of the inhaled anesthetics isoflurane, sevoflurane and desflurane on the neuropathogenesis of Alzheimer's disease (review). Mol Med Rep 2015; 12:3-12. [PMID: 25738734 PMCID: PMC4438950 DOI: 10.3892/mmr.2015.3424] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 02/11/2015] [Indexed: 11/06/2022] Open
Abstract
The incidence of Alzheimer's disease (AD) in individuals >65 years of age is 13% and ~66 million individuals in this age group undergo surgery annually under anesthesia. It is therefore important to determine whether commonly used inhaled anesthetics induce cytotoxicity, which may lead to neurodegeneration. Findings from several studies suggest that the anesthetics, isoflurane, sevoflurane and desflurane, may activate caspases, increase the synthesis and accumulation of β-amyloid (Aβ) protein, and induce hyperphosphorylation of tau proteins, all of which are cellular responses consistent with the neuropathogenesis of AD. Other studies have arrived at different and occasionally contradictory conclusions. The present review attempts to resolve this discrepancy by reviewing previous studies, which have investigated the effects of commonly used inhaled anesthetics on the synthesis and accumulation of Aβ, tau pathology and cognitive function. The possible underlying mechanism was also reviewed. However, several aspects of this phenomenon remain to be elucidated. Further studies are required to fully examine anesthesia-induced neurotoxicity and elucidate the effect of inhaled anesthetics on the onset and progression of AD.
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Affiliation(s)
- Jue Jiang
- Department of Anesthesiology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Hong Jiang
- Department of Anesthesiology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
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Minocycline Alleviates Sevoflurane-Induced Cognitive Impairment in Aged Rats. Cell Mol Neurobiol 2015; 35:585-94. [DOI: 10.1007/s10571-014-0154-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 12/29/2014] [Indexed: 12/15/2022]
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Jabłkowski M, Szemraj M, Oszajca K, Janiszewska G, Bartkowiak J, Szemraj J. New type of BACE1 siRNA delivery to cells. Med Sci Monit 2014; 20:2598-606. [PMID: 25491230 PMCID: PMC4266366 DOI: 10.12659/msm.891219] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Small interfering RNA (siRNA) gene therapy is a new molecular approach in the search for an efficient therapy for Alzheimer disease (AD), based on the principle of RNA interference. Reducing BACE activity can have great therapeutic potential for the treatment of AD. In this study, receptor-mediated delivery was used to deliver opioid peptide-conjugated BACE 1 to INR-32 human neuroblastoma cells. MATERIAL AND METHODS An INR-32 human neuroblastoma cell line was stably transfected to express the APP cDNA coding fragment containing the predicted sites for cleavage by α, β, or γ-secretase. This was then treated with BACE 1 siRNA to silence BACE gene expression. BACE gene transcription and translation was determined using BACE-1 siRNA cross-linked with opioid peptide, together with RT-PCR, Western blot analysis, and ELISA. RESULTS Receptor-mediated delivery was used to introduce BACE1 siRNA to the APP - INR 32 human neuroblastoma cells. Decreased BACE mRNA and protein expression were observed after the cells were transfected with BACE1 siRNA. CONCLUSIONS Delivery of BACE1 siRNA appears to specifically reduce the cleavage of APP by inhibiting BACE1 activity.
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Affiliation(s)
- Maciej Jabłkowski
- Department of Infectious and Liver Diseases, Medical University of Łódź, Łódź, Poland
| | - Maciej Szemraj
- Department of Medical Biochemistry, Medical University of Łódź, Łódź, Poland
| | - Katarzyna Oszajca
- Department of Medical Biochemistry, Medical University of Łódź, Łódź, Poland
| | - Grażyna Janiszewska
- Department of Medical Biochemistry, Medical University of Łódź, Łódź, Poland
| | - Jacek Bartkowiak
- Department of Medical Biochemistry, Medical University of Łódź, Łódź, Poland
| | - Janusz Szemraj
- Department of Medical Biochemistry, Medical University of Łódź, Łódź, Poland
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General anesthetics and β-amyloid protein. Prog Neuropsychopharmacol Biol Psychiatry 2013; 47:140-6. [PMID: 22918033 PMCID: PMC3510311 DOI: 10.1016/j.pnpbp.2012.08.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 08/02/2012] [Accepted: 08/02/2012] [Indexed: 11/23/2022]
Abstract
With roughly 234 million people undergoing surgery with anesthesia each year worldwide, it is important to determine whether commonly used anesthetics can induce any neurotoxicity. Alzheimer's disease (AD) is the most common form of age-related dementia, and a rapidly growing health problem. Several studies suggest that anesthesia could be associated with the development of AD. Moreover, studies in cultured cells and animals show that commonly used inhalation anesthetics may induce changes consistent with AD neuropathogenesis, e.g., β-amyloid protein accumulation. Therefore, in this mini review, we focus on the recent research investigating the effects of commonly used anesthetics including isoflurane, sevoflurane, desflurane, nitrous oxide, and propofol, on Aβ accumulation in vitro and in vivo. We further discuss the future direction of the research determining the effects of anesthetics on β-amyloid protein accumulation.
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Yang SG, Wang SW, Zhao M, Zhang R, Zhou WW, Li YN, Su YJ, Zhang H, Yu XL, Liu RT. A peptide binding to the β-site of APP improves spatial memory and attenuates Aβ burden in Alzheimer's disease transgenic mice. PLoS One 2012; 7:e48540. [PMID: 23133641 PMCID: PMC3486805 DOI: 10.1371/journal.pone.0048540] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 09/26/2012] [Indexed: 12/15/2022] Open
Abstract
Amyloid precursor protein cleaving enzyme 1 (BACE1), an aspartyl protease, initiates processing of the amyloid precursor protein (APP) into β-amyloid (Aβ); the peptide likely contributes to development of Alzheimer’s disease (AD). BACE1 is an attractive therapeutic target for AD treatment, but it exhibits other physiological activities and has many other substrates besides APP. Thus, inhibition of BACE1 function may cause adverse side effects. Here, we present a peptide, S1, isolated from a peptide library that selectively inhibits BACE1 hydrolytic activity by binding to the β-proteolytic site on APP and Aβ N-terminal. The S1 peptide significantly reduced Aβ levels in vitro and in vivo and inhibited Aβ cytotoxicity in SH-SY5Y cells. When applied to APPswe/PS1dE9 double transgenic mice by intracerebroventricular injection, S1 significantly improved the spatial memory as determined by the Morris Water Maze, and also attenuated their Aβ burden. These results indicate that the dual-functional peptide S1 may have therapeutic potential for AD by both reducing Aβ generation and inhibiting Aβ cytotoxicity.
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Affiliation(s)
- Shi-gao Yang
- Tsinghua University School of Medicine, Haidian District, Beijing, China
| | - Shao-wei Wang
- Tsinghua University School of Medicine, Haidian District, Beijing, China
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Min Zhao
- Tsinghua University School of Medicine, Haidian District, Beijing, China
| | - Ran Zhang
- Tsinghua University School of Medicine, Haidian District, Beijing, China
| | - Wei-wei Zhou
- Tsinghua University School of Medicine, Haidian District, Beijing, China
| | - Ya-nan Li
- Tsinghua University School of Medicine, Haidian District, Beijing, China
- School of Life Sciences, Ningxia University, Yinchuan, China
| | - Ya-jing Su
- Tsinghua University School of Medicine, Haidian District, Beijing, China
- School of Life Sciences, Ningxia University, Yinchuan, China
| | - He Zhang
- Tsinghua University School of Medicine, Haidian District, Beijing, China
| | - Xiao-lin Yu
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
- * E-mail: (RTL); (XLY)
| | - Rui-tian Liu
- Tsinghua University School of Medicine, Haidian District, Beijing, China
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
- * E-mail: (RTL); (XLY)
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Dong Y, Wu X, Xu Z, Zhang Y, Xie Z. Anesthetic isoflurane increases phosphorylated tau levels mediated by caspase activation and Aβ generation. PLoS One 2012; 7:e39386. [PMID: 22745746 PMCID: PMC3379981 DOI: 10.1371/journal.pone.0039386] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Accepted: 05/23/2012] [Indexed: 12/01/2022] Open
Abstract
Anesthetic isoflurane has been shown to promote Alzheimer’s disease (AD) neuropathogenesis by inducing caspase activation and accumulation of β-amyloid (Aβ). Phosphorylation of tau protein is another important feature of AD neuropathogenesis. However, the effects of isoflurane on phosphorylated tau levels remain largely to be determined. We therefore set out to determine whether isoflurane can increase phosphorylated tau levels. 5 to 8 month-old wild-type and AD transgenic mice [B6.Cg-Tg (APPswe, PSEN1dE9)85Dbo/J] were treated with 1.4% isoflurane for two hours. The mice brain tissues were harvested at six, 12 and 24 hours after the anesthesia. For the in vitro studies, primary neurons from wild-type and the AD transgenic mice were exposed to 2% isoflurane for six hours, and were harvested at the end of anesthesia. The harvested brain tissues and neurons were subjected to Western blot analysis by which the levels of phosphorylated tau protein at Serine 262 (Tau-PS262) were determined. Here we show that the isoflurane anesthesia increased Tau-PS262 levels in brain tissues and primary neurons from the wild-type and AD transgenic mice. Moreover, the isoflurane anesthesia may induce a greater increase in Tau-PS262 levels in primary neurons and brain tissues from the AD transgenic mice. Finally, caspase activation inhibitor Z-VAD and Aβ generation inhibitor L-685,458 attenuated the isoflurane-induced increases in Tau-PS262 levels. In conclusion, clinically relevant isoflurane anesthesia increases phosphorylated tau levels, which may result from the isoflurane-induced caspase activation and Aβ generation. These findings will promote more studies to determine the effects of anesthetics on tau phosphorylation.
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Affiliation(s)
- Yuanlin Dong
- Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, United States of America
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