Protective Effects Induced by Microwave-Assisted Aqueous Harpagophytum Extract on Rat Cortex Synaptosomes Challenged with Amyloid β-Peptide

2017 ◽  
Vol 31 (8) ◽  
pp. 1257-1264 ◽  
Author(s):  
Claudio Ferrante ◽  
Lucia Recinella ◽  
Marcello Locatelli ◽  
Paolo Guglielmi ◽  
Daniela Secci ◽  
...  
Keyword(s):  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Rat Cortex ◽  
Microwave Assisted

scholarly journals Tongxinluo Exerts Inhibitory Effects on Pyroptosis and Amyloid-β Peptide Accumulation after Cerebral Ischemia/Reperfusion in Rats

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bing Wang ◽  
Zhongkuan Lyu ◽  
Yuanjin Chan ◽  
Qiyue Li ◽  
Li Zhang ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Ischemia Reperfusion ◽  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Glymphatic System ◽  
Pyrin Domain ◽  
Cerebral Ischemia Reperfusion ◽  
Potential Possibility ◽  
Important Pathway

Amyloid-β peptide (Aβ) accumulation is a detrimental factor in cerebral ischemia/reperfusion (I/R) injuries accounting for dementia induced by ischemic stroke. In addition to blood brain barrier (BBB), the glymphatic system mediated by aquaporin-4 (AQP-4) on astrocytic endfeet functions as an important pathway for the clearance of Aβ in the brain. Cerebral I/R induced astrocytic pyroptosis potentially causes the AQP-4 polarization loss and dysfunctional BBB-glymphatic system exacerbating the accumulation of Aβ. Furthermore, Aβ toxicity has been identified as a trigger of pyroptosis and BBB damage, suggesting an amplified effect of Aβ accumulation after cerebral I/R. Therefore, based on our previous work, this study was designed to explore the intervention effects of Tongxinluo (TXL) on astrocytic pyroptosis and Aβ accumulation after cerebral I/R in rats. The results showed that TXL intervention obviously alleviated the degree of pyroptosis by downregulating expression levels of cleaved caspase-11/1, N-terminal gasdermin D, nucleotide-binding oligomerization domain-like receptors pyrin domain containing 3 (NLRP3), interleukin-6 (IL-6), and cleaved IL-1β and abated astrocytic pyroptosis after cerebral I/R. Moreover, TXL intervention facilitated to restore AQP-4 polarization and accordingly relieve Aβ accumulation around astrocytes in ischemic cortex and hippocampus as well as the formation of toxic Aβ (Aβ1–42 oligomer). Our study indicated that TXL intervention could exert protective effects on ischemic brain tissues against pyroptotic cell death, inhibit astrocytic pyroptosis, and reduce toxic Aβ accumulation around astrocytes in cerebral I/R injuries. Furthermore, our study provides biological evidence for the potential possibility of preventing and treating poststroke dementia with TXL in clinical practice.

Echinacoside ameliorates the memory impairment and cholinergic deficit induced by amyloid beta peptides via the inhibition of amyloid deposition and toxicology

2017 ◽  
Vol 8 (6) ◽  
pp. 2283-2294 ◽  
Author(s):  
Young-Ji Shiao ◽  
Muh-Hwan Su ◽  
Hang-Ching Lin ◽  
Chi-Rei Wu
Keyword(s):  
Amyloid Beta ◽  
Memory Impairment ◽  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Neuronal Function ◽  
Amyloid Beta Peptides ◽  
Beta Peptides ◽  
Amyloid Cascade

This study investigates the role of the amyloid cascade and central neuronal function on the protective effects of echinacoside in amyloid β peptide 1-42 (Aβ 1-42)-treated SH-SY5Y cells and an Aβ 1-42-infused rat.

scholarly journals Tetramethylpyrazine Derivative T-006 Ameliorates the Amyloid-β Plagues of Transgenic Alzhermer's Mice by Modulation of TLR4-mediated MyD88/NF-κB Signaling

2021 ◽  
Author(s):  
Haiyun Chen ◽  
Xiao Chang ◽  
Jiemei Zhou ◽  
Guiliang Zhang ◽  
Jiehong Cheng ◽  
...  
Keyword(s):  
Calcium Binding ◽  
Neuroprotective Effect ◽  
Amyloid Β ◽  
Trigger Factor ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Proinflammatory Mediators ◽  
Underlying Mechanisms ◽  
Related Proteins ◽  
Bv2 Microglial Cells

Abstract BackgroundMicroglial activation mediated neuroinflammation was considered as a vital trigger factor in the pathogenesis of Alzheimer’s disease (AD). T-006, a new tetramethylpyrazine derivative, has been recently found to alleviate cognitive deficits via inhibition of Tau expression and phosphorylation in AD transgenic mouse models. Here, we hypothesized that T-006 may ameliorate AD-like pathology by suppressing the neuroinflammation. MethodsAPP/PS1 transgenic AD mouse model was used here to evaluate the anti-inflammatory effect of T-006 and its underlying mechanisms, as well as its potential protective effects against lipopolysaccharide (LPS)-activated microglial-induced neurotoxicity.ResultsOur results indicated that T-006 significantly decreased the levels of total amyloid β peptide (Aβ) and glial fibrillary acidic protein (GFAP) as well as the ionized calcium binding adaptor molecule-1 (Ibα-1) expression in the APP/PS1 mice. Moreover, T-006 dramatically suppressed abnormal elevation of inflammatory mediators and reduced the levels of Toll-like receptor 4 (TLR4), myeloid differential protein-88 (MyD88) and NF-κB signaling related proteins in lipopolysaccharide (LPS)-induced BV2 microglial cells. We also found that TAK242, a TLR4 inhibitor could abolish the down-regulation of T-006 on LPS-induced proinflammatory mediators and reversed the downstream proteins expression containing MyD88 and NF-κB signaling. Importantly, T-006 prevented against neuroinflammation induced neurotoxicity by mitigating reactive oxygen species (ROS) overproduction and mitochondrial membrane potential (MMP) dissipation. Conclusions T-006 exerts neuroprotective effect in treating AD by suppressing the neuroinflammation through modulation of TLR4-mediated MyD88/NF-κB signaling pathways.

scholarly journals Neuropharmacological Effects of Quercetin: A Literature-Based Review

2021 ◽  
Vol 12 ◽  
Author(s):  
Md. Shahazul Islam ◽  
Cristina Quispe ◽  
Rajib Hossain ◽  
Muhammad Torequl Islam ◽  
Ahmed Al-Harrasi ◽  
...  
Keyword(s):  
Neurodegenerative Diseases ◽  
Neuroprotective Effect ◽  
Animal Experiments ◽  
Amyloid Β ◽  
Neuronal Injury ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Neuroprotective Effects

Quercetin (QUR) is a natural bioactive flavonoid that has been lately very studied for its beneficial properties in many pathologies. Its neuroprotective effects have been demonstrated in many in vitro studies, as well as in vivo animal experiments and human trials. QUR protects the organism against neurotoxic chemicals and also can prevent the evolution and development of neuronal injury and neurodegeneration. The present work aimed to summarize the literature about the neuroprotective effect of QUR using known database sources. Besides, this review focuses on the assessment of the potential utilization of QUR as a complementary or alternative medicine for preventing and treating neurodegenerative diseases. An up-to-date search was conducted in PubMed, Science Direct and Google Scholar for published work dealing with the neuroprotective effects of QUR against neurotoxic chemicals or in neuronal injury, and in the treatment of neurodegenerative diseases. Findings suggest that QUR possess neuropharmacological protective effects in neurodegenerative brain disorders such as Alzheimer’s disease, Amyloid β peptide, Parkinson’s disease, Huntington's disease, multiple sclerosis, and amyotrophic lateral sclerosis. In summary, this review emphasizes the neuroprotective effects of QUR and its advantages in being used in complementary medicine for the prevention and treatment o of different neurodegenerative diseases.

P1-018: Protective effects of pre--germinated brown rice extract against amyloid β-Peptide (1-42) -induced apoptosis in neuronal SK-N-SH cells

2011 ◽  
Vol 7 ◽  
pp. S117-S117
Author(s):  
Rungtip Soi-ampornkul ◽  
Sarawut Junnu ◽  
Surin Kanyok ◽  
Sompong Liammongkolkul ◽  
Wanphen Katunyoo ◽  
...  
Keyword(s):  
Brown Rice ◽  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Germinated Brown Rice ◽  
Induced Apoptosis

Protective effects of S-nitrosoglutathione against amyloid β-peptide neurotoxicity

2005 ◽  
Vol 38 (7) ◽  
pp. 938-949 ◽  
Author(s):  
Tzyh-Chwen Ju ◽  
Shang-Der Chen ◽  
Chia-Chin Liu ◽  
Ding-I Yang
Keyword(s):  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Protective Effects

A Cationic Gallium Phthalocyanine Inhibits Amyloid β Peptide Fibril Formation

2020 ◽  
Vol 17 (7) ◽  
pp. 589-600
Author(s):  
Shatera Tabassum ◽  
Abdullah Md. Sheikh ◽  
Shozo Yano ◽  
Takahisa Ikeue ◽  
Shingo Mitaki ◽  
...  
Keyword(s):  
Near Infrared ◽  
Amyloid Β ◽  
Neuronal Cell ◽  
Fibril Formation ◽  
Lag Phase ◽  
Slice Culture ◽  
Amyloid Β Peptide ◽  
Protective Effects ◽  
Aβ Aggregation

Background: Amyloid β (Aβ) peptide deposition is considered as the main cause of Alzheimer’s disease (AD). Previously, we have shown that a Zn containing neutral phthalocyanine (Zn-Pc) inhibits Aβ fibril formation. Objective: The objective of this study is to investigate the effects of a cationic gallium containing Pc (GaCl-Pc) on Aβ fibril formation process. Methods and Results: Aβ fibril formation was induced by incubating synthetic Aβ peptides in a fibril forming buffer, and the amount of fibril was evaluated by ThT fluorescence assay. GaCl-Pc dosedependently inhibited both Aβ1-40 and Aβ1-42 fibril formation. It mainly inhibited the elongation phase of Aβ1-42 fibril formation kinetics, but not the lag phase. Western blotting results showed that it did not inhibit its oligomerization process, rather increased it. Additionally, GaCl-Pc destabilized preformed Aβ1- 42 fibrils dose-dependently in vitro condition, and decreased Aβ levels in the brain slice culture of APP transgenic AD model mice (J20 strain). Near-infrared scanning results showed that GaCl-Pc had the ability to bind to Aβ1-42. MTT assay demonstrated that GaCl-Pc did not have toxicity towards a neuronal cell line (A1) in culture rather, showed protective effects on Aβ-induced toxicity. Moreover, it dosedependently decreased Aβ-induced reactive oxygen species levels in A1 culture. Conclusion: Thus, our result demonstrated that GaCl-Pc decreased Aβ aggregation and destabilized the preformed fibrils. Since cationic molecules show a better ability to cross the blood-brain barrier, cationic GaCl-Pc could be important for the therapy of AD.

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