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  1. Article ; Online: Small Molecules

    Zhao, Yusheng / Rao, Praveen P N

    ACS chemical neuroscience

    2023  Volume 14, Issue 23, Page(s) 4185–4198

    Abstract: This study reports the unusual ability of small ... ...

    Abstract This study reports the unusual ability of small molecules
    MeSH term(s) Humans ; Amyloid beta-Peptides/metabolism ; Peptide Fragments/metabolism ; Alzheimer Disease/metabolism ; Neurons/metabolism
    Chemical Substances amyloid beta-protein (1-42) ; Amyloid beta-Peptides ; Peptide Fragments
    Language English
    Publishing date 2023-11-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1948-7193
    ISSN (online) 1948-7193
    DOI 10.1021/acschemneuro.3c00576
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Differential Effects of Endocannabinoids on Amyloid-Beta Aggregation and Toxicity.

    Khavandi, Marzie / Rao, Praveen P N / Beazely, Michael A

    International journal of molecular sciences

    2023  Volume 24, Issue 2

    Abstract: The regulation and metabolism of the endocannabinoid system has received extensive attention for their potential neuroprotective effect in neurodegenerative diseases such as Alzheimer's disease (AD), which is characterized by amyloid β (Aβ) -induced cell ...

    Abstract The regulation and metabolism of the endocannabinoid system has received extensive attention for their potential neuroprotective effect in neurodegenerative diseases such as Alzheimer's disease (AD), which is characterized by amyloid β (Aβ) -induced cell toxicity, inflammation, and oxidative stress. Using in vitro techniques and two cell lines, the mouse hippocampus-derived HT22 cells and Chinese hamster ovary (CHO) cells expressing human cannabinoid receptor type 1 (CB1), we investigated the ability of endocannabinoids to inhibit Aβ aggregation and protect cells against Aβ toxicity. The present study provides evidence that endocannabinoids N-arachidonoyl ethanol amide (AEA), noladin and O-arachidonoyl ethanolamine (OAE) inhibit Aβ42 aggregation. They were able to provide protection against Aβ42 induced cytotoxicity via receptor-mediated and non-receptor-mediated mechanisms in CB1-CHO and HT22 cells, respectively. The aggregation kinetic experiments demonstrate the anti-Aβ aggregation activity of some endocannabinoids (AEA, noladin). These data demonstrate the potential role and application of endocannabinoids in AD pathology and treatment.
    MeSH term(s) Mice ; Animals ; Cricetinae ; Humans ; Endocannabinoids/pharmacology ; Endocannabinoids/metabolism ; Amyloid beta-Peptides/toxicity ; CHO Cells ; Cricetulus ; Alzheimer Disease/metabolism
    Chemical Substances Endocannabinoids ; Amyloid beta-Peptides
    Language English
    Publishing date 2023-01-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24020911
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Post-Translational Modifications in Tau and Their Roles in Alzheimer's Pathology.

    Kalyaanamoorthy, Subha / Opare, Stanley Kojo / Xu, Xiaoxiao / Ganesan, Aravindhan / Rao, Praveen P N

    Current Alzheimer research

    2024  

    Abstract: Microtubule-Associated Protein Tau (also known as tau) has been shown to accumulate into paired helical filaments and neurofibrillary tangles, which are known hallmarks of Alzheimer's disease (AD) pathology. Decades of research have shown that tau ... ...

    Abstract Microtubule-Associated Protein Tau (also known as tau) has been shown to accumulate into paired helical filaments and neurofibrillary tangles, which are known hallmarks of Alzheimer's disease (AD) pathology. Decades of research have shown that tau protein undergoes extensive post-translational modifications (PTMs), which can alter the protein's structure, function, and dynamics and impact the various properties such as solubility, aggregation, localization, and homeostasis. There is a vast amount of information describing the impact and role of different PTMs in AD pathology and neuroprotection. However, the complex interplay between these PTMs remains elusive. Therefore, in this review, we aim to comprehend the key post-translational modifications occurring in tau and summarize potential connections to clarify their impact on the physiology and pathophysiology of tau. Further, we describe how different computational modeling methods have helped in understanding the impact of PTMs on the structure and functions of the tau protein. Finally, we highlight the tau PTM-related therapeutics strategies that are explored for the development of AD therapy.
    Language English
    Publishing date 2024-04-15
    Publishing country United Arab Emirates
    Document type Journal Article
    ZDB-ID 2205170-3
    ISSN 1875-5828 ; 1567-2050
    ISSN (online) 1875-5828
    ISSN 1567-2050
    DOI 10.2174/0115672050301407240408033046
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Modeling the Inhibition Kinetics of Curcumin, Orange G, and Resveratrol with Amyloid-β Peptide.

    Madhuranthakam, Chandra Mouli R / Shakeri, Arash / Rao, Praveen P N

    ACS omega

    2021  Volume 6, Issue 12, Page(s) 8680–8686

    Abstract: The β-amyloid (Aβ) protein aggregation into toxic forms is one of the major factors in the Alzheimer's disease (AD) pathology. Screening compound libraries as inhibitors of Aβ-aggregation is a common strategy to discover novel molecules as potential ... ...

    Abstract The β-amyloid (Aβ) protein aggregation into toxic forms is one of the major factors in the Alzheimer's disease (AD) pathology. Screening compound libraries as inhibitors of Aβ-aggregation is a common strategy to discover novel molecules as potential therapeutics in AD. In this regard, thioflavin T (ThT)-based fluorescence spectroscopy is a widely used in vitro method to identify inhibitors of Aβ aggregation. However, conventional data processing of the ThT assay experimental results generally provides only qualitative output and lacks inhibitor-specific quantitative data, which can offer a number of advantages such as identification of critical inhibitor-specific parameters required to design superior inhibitors and reduce the need to conduct extensive in vitro kinetic studies. Therefore, we carried out mathematical modeling based on logistic equation and power law (PL) model to correlate the experimental results obtained from the ThT-based Aβ40 aggregation kinetics for small-molecule inhibitors curcumin, orange G, and resveratrol and quantitatively fit the data in a logistic equation. This approach provides important inhibitor-specific parameters such as lag time λ, inflection point τ, maximum slope
    Language English
    Publishing date 2021-03-19
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.1c00610
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Peptide-Modified Gemini Surfactants as Delivery System Building Blocks with Dual Functionalities for Glaucoma Treatment: Gene Carriers and Amyloid-Beta (Aβ) Self-Aggregation Inhibitors.

    Narsineni, Lokesh / Rao, Praveen P N / Pham, Amy Trinh / Foldvari, Marianna

    Molecular pharmaceutics

    2022  Volume 19, Issue 8, Page(s) 2737–2753

    Abstract: Retinal ganglion cell (RGC) neurodegeneration in glaucoma has potential links with amyloid-β (Aβ) deposition. Targeting the Aβ pathway was shown to reduce RGC apoptosis and protect RGCs from degeneration. We report exploratory studies on the amyloid ... ...

    Abstract Retinal ganglion cell (RGC) neurodegeneration in glaucoma has potential links with amyloid-β (Aβ) deposition. Targeting the Aβ pathway was shown to reduce RGC apoptosis and protect RGCs from degeneration. We report exploratory studies on the amyloid Aβ
    MeSH term(s) Amyloid beta-Peptides/metabolism ; Glaucoma/drug therapy ; Humans ; Hydrophobic and Hydrophilic Interactions ; Molecular Docking Simulation ; Peptide Fragments/metabolism ; Polymers ; Surface-Active Agents/chemistry
    Chemical Substances Amyloid beta-Peptides ; Peptide Fragments ; Polymers ; Surface-Active Agents
    Language English
    Publishing date 2022-07-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2138405-8
    ISSN 1543-8392 ; 1543-8384
    ISSN (online) 1543-8392
    ISSN 1543-8384
    DOI 10.1021/acs.molpharmaceut.2c00088
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Strategies in the design and development of (TAR) DNA-binding protein 43 (TDP-43) binding ligands.

    Rao, Praveen P N / Shakeri, Arash / Zhao, Yusheng / Calon, Frederic

    European journal of medicinal chemistry

    2021  Volume 225, Page(s) 113753

    Abstract: The human transactive responsive (TAR) DNA-binding protein 43 (TDP-43) is involved in a number of physiological processes in the body. Its primary function involves RNA regulation. The TDP-43 protein is also involved in many diseases such as amyotrophic ... ...

    Abstract The human transactive responsive (TAR) DNA-binding protein 43 (TDP-43) is involved in a number of physiological processes in the body. Its primary function involves RNA regulation. The TDP-43 protein is also involved in many diseases such as amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), Alzheimer's disease (AD), Parkinson's disease (PD) and even cancers. These TDP-43 mediated diseases are collectively called as TDP-43 proteinopathies. Intense research in the last decade has increased our understanding on TDP-43 structure and function in biology. The three-dimensional structures of TDP-43 domains such as N-terminal domain (NTD), RNA-recognition motif-1 (RRM1), RNA-recognition motif-2 (RRM2) and the C-terminal domain (CTD) or low-complexity domain (LCD) have been solved. These structures have yielded insights into novel binding sites and pockets at various TDP-43 domains, which can be targeted by designing a diverse library of ligands including small molecules, peptides and oligonucleotides as molecular tools to (i) study TDP-43 function, (ii) develop novel diagnostic agents and (iii) discover disease-modifying therapies to treat TDP-43 proteinopathies. This review provides a summary on recent progress in the development of TDP-43 binding ligands and uses the solved structures of various TDP-43 domains to investigate putative ligand binding regions that can be exploited to discover novel molecular probes to modulate TDP-43 structure and function.
    MeSH term(s) Animals ; DNA-Binding Proteins/antagonists & inhibitors ; DNA-Binding Proteins/chemistry ; DNA-Binding Proteins/metabolism ; Drug Development ; Humans ; Ligands ; Molecular Structure ; Oligonucleotides/chemical synthesis ; Oligonucleotides/chemistry ; Oligonucleotides/pharmacology ; Peptides/chemical synthesis ; Peptides/chemistry ; Peptides/pharmacology ; Small Molecule Libraries/chemical synthesis ; Small Molecule Libraries/chemistry ; Small Molecule Libraries/pharmacology
    Chemical Substances DNA-Binding Proteins ; Ligands ; Oligonucleotides ; Peptides ; Small Molecule Libraries
    Language English
    Publishing date 2021-08-08
    Publishing country France
    Document type Journal Article ; Review
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2021.113753
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: 2,4-Disubstituted quinazolines as amyloid-β aggregation inhibitors with dual cholinesterase inhibition and antioxidant properties: Development and structure-activity relationship (SAR) studies.

    Mohamed, Tarek / Rao, Praveen P N

    European journal of medicinal chemistry

    2017  Volume 126, Page(s) 823–843

    Abstract: A library of fifty-seven 2,4-disubstituted quinazoline derivatives were designed, synthesized and evaluated as a novel class of multi-targeting agents to treat Alzheimer's disease (AD). The biological assay results demonstrate the ability of several ... ...

    Abstract A library of fifty-seven 2,4-disubstituted quinazoline derivatives were designed, synthesized and evaluated as a novel class of multi-targeting agents to treat Alzheimer's disease (AD). The biological assay results demonstrate the ability of several quinazoline derivatives to inhibit both acetyl and butyrylcholinesterase (AChE and BuChE) enzymes (IC
    MeSH term(s) Amyloid beta-Peptides/chemistry ; Antioxidants/chemistry ; Antioxidants/metabolism ; Antioxidants/pharmacology ; Butyrylcholinesterase/chemistry ; Butyrylcholinesterase/metabolism ; Cholinesterase Inhibitors/chemistry ; Cholinesterase Inhibitors/metabolism ; Cholinesterase Inhibitors/pharmacology ; Drug Design ; Humans ; Molecular Docking Simulation ; Peptide Fragments/chemistry ; Protein Aggregates/drug effects ; Protein Conformation ; Quinazolines/chemistry ; Quinazolines/metabolism ; Quinazolines/pharmacology ; Structure-Activity Relationship
    Chemical Substances Amyloid beta-Peptides ; Antioxidants ; Cholinesterase Inhibitors ; Peptide Fragments ; Protein Aggregates ; Quinazolines ; amyloid beta-protein (1-40) ; amyloid beta-protein (1-42) ; Butyrylcholinesterase (EC 3.1.1.8)
    Language English
    Publishing date 2017-01-27
    Publishing country France
    Document type Journal Article
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2016.12.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Tau Derived Hexapeptide AcPHF6 Promotes Beta-Amyloid (Aβ) Fibrillogenesis.

    Mohamed, Tarek / Gujral, Sarbjeet Singh / Rao, Praveen P N

    ACS chemical neuroscience

    2017  Volume 9, Issue 4, Page(s) 773–782

    Abstract: We studied the interactions of a tau derived hexapeptide AcPHF6 with β-amyloid peptides Aβ40 and Aβ42 which reveals its unusual ability to promote Aβ fibrillogenesis. The results demonstrate that the N-acetylated and C-amidated AcPHF6 hexapeptide can ... ...

    Abstract We studied the interactions of a tau derived hexapeptide AcPHF6 with β-amyloid peptides Aβ40 and Aβ42 which reveals its unusual ability to promote Aβ fibrillogenesis. The results demonstrate that the N-acetylated and C-amidated AcPHF6 hexapeptide can cause significant acceleration in Aβ40 and Aβ42 fibril growth. Aggregation kinetic studies at pH 7.4 show that at 25 μM, AcPHF6 hexapeptide was able to cause ∼2.3-fold increase in Aβ40 fibrillogenesis dramatically changing the aggregation kinetics. In addition, AcPHF6 peptide was able to reduce cellular toxicity mediated by Aβ40 and Aβ42 in hippocampal neuronal cell line (HT22). Computational studies suggest that the AcPHF6 peptide can act as an anchor and provides a hydrophobic surface for Aβ monomer to bind and undergo rapid fibrillogenesis to form less toxic fibrils and alter the aggregation kinetics. At the molecular level we propose a "dock-and-pack" mechanism where the AcPHF6 hexapeptide aggregates can stabilize the β-hairpin and promote rapid Aβ self-assembly and growth to form less toxic oligomers or fibrils. Our results have direct implications in designing novel peptide/peptidomimetics as novel pharmacological tools to study protein aggregation and potentially prevent Aβ-mediated toxicity in Alzheimer's disease.
    MeSH term(s) Alzheimer Disease/drug therapy ; Alzheimer Disease/metabolism ; Amyloid/drug effects ; Amyloid/metabolism ; Amyloid beta-Peptides/metabolism ; Cell Line ; Humans ; Hydrophobic and Hydrophilic Interactions/drug effects ; Neurons/drug effects ; Oligopeptides/chemistry ; Oligopeptides/pharmacology
    Chemical Substances Amyloid ; Amyloid beta-Peptides ; Oligopeptides ; acetyl-valyl-glutaminyl-isoleucyl-valyl-tyrosyl-lysinamide
    Language English
    Publishing date 2017-12-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1948-7193
    ISSN (online) 1948-7193
    DOI 10.1021/acschemneuro.7b00433
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Interactions of polyunsaturated fatty acids with amyloid peptides Aβ40 and Aβ42.

    El Shatshat, Amna / Pham, Amy Trinh / Rao, Praveen P N

    Archives of biochemistry and biophysics

    2018  Volume 663, Page(s) 34–43

    Abstract: Polyunsaturated fatty acids (PUFAs) are reported to exert beneficial effects in Alzheimer's disease. Some PUFAs are known to reduce amyloid-beta (Aβ) toxicity by promoting its degradation and clearance. Studies on the direct interactions of PUFAs with Aβ ...

    Abstract Polyunsaturated fatty acids (PUFAs) are reported to exert beneficial effects in Alzheimer's disease. Some PUFAs are known to reduce amyloid-beta (Aβ) toxicity by promoting its degradation and clearance. Studies on the direct interactions of PUFAs with Aβ peptides are limited and contradictory. In this study, we report the interactions of fatty acids docosahexaenoic acid (DHA), eicosatetraenoic acid (EPA), α-linolenic acid (ALA), arachidonic acid (ARA), linoleic acid (LNA) and oleic acid (OA) with Aβ peptides by carrying out fluorescence based aggregation kinetic experiments, transmission electron microscopy and molecular docking studies. Our investigations demonstrate that all the fatty acids tested exhibit anti-aggregation properties by preventing both Aβ40 and Aβ42 fibrillogenesis (∼16-84% inhibition). OA and DHA were identified as excellent inhibitors of Aβ40 or Aβ42 fibrillogenesis respectively (∼84% and 81% inhibition at 25 μM). Molecular docking studies conducted, using the dimer and oligomer models of Aβ40 peptide, suggest that these fatty acids interact in the aggregation prone Phe19-Ala21 and the β-turn region (Asp23-Lys28) whereas a similar study with Aβ42 dimer and oligomer models, indicate that the fatty acids were oriented in a hydrophobic region (Gln15, Leu16, Leu17 and Leu34). These results, suggest that DHA, EPA, ALA, ARA, LNA and OA are capable of directly interacting with both Aβ40 and Aβ42 peptides. These studies will have implications in developing potential therapeutics for Alzheimer's disease.
    MeSH term(s) Amyloid beta-Peptides/metabolism ; Dimerization ; Fatty Acids, Unsaturated/metabolism ; Humans ; Kinetics ; Microscopy, Electron, Transmission ; Molecular Docking Simulation ; Peptide Fragments/metabolism ; Protein Binding ; Spectrometry, Fluorescence
    Chemical Substances Amyloid beta-Peptides ; Fatty Acids, Unsaturated ; Peptide Fragments ; amyloid beta-protein (1-40) ; amyloid beta-protein (1-42)
    Language English
    Publishing date 2018-12-26
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 523-x
    ISSN 1096-0384 ; 0003-9861
    ISSN (online) 1096-0384
    ISSN 0003-9861
    DOI 10.1016/j.abb.2018.12.027
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  10. Article: Drug Repurposing: Dipeptidyl Peptidase IV (DPP4) Inhibitors as Potential Agents to Treat SARS-CoV-2 (2019-nCoV) Infection.

    Rao, Praveen P N / Pham, Amy Trinh / Shakeri, Arash / El Shatshat, Amna / Zhao, Yusheng / Karuturi, Rahul C / Hefny, Ahmed A

    Pharmaceuticals (Basel, Switzerland)

    2021  Volume 14, Issue 1

    Abstract: The current outbreak of severe acute respiratory distress syndrome (SARS) or nCOVID-19 pandemic, caused by the coronavirus-2 (CoV-2), continues to wreak havoc globally. As novel vaccines are being discovered and developed, small molecule drugs still ... ...

    Abstract The current outbreak of severe acute respiratory distress syndrome (SARS) or nCOVID-19 pandemic, caused by the coronavirus-2 (CoV-2), continues to wreak havoc globally. As novel vaccines are being discovered and developed, small molecule drugs still constitute a viable treatment option for SARS-CoV-2 infections due to their advantages such as superior patient compliance for oral therapies, reduced manufacturing costs and ease of large scale distribution due to better stability and storage profiles. Discovering new drugs for SARS-CoV-2 infections is a time consuming and expensive proposition. In this regard, drug repurposing is an appealing approach which can provide rapid access to therapeutics with proven record of safety and efficacy. We investigated the drug repurposing potential of a library of dipeptidyl peptidase 4 (DPP4) inhibitors which are currently marketed for type-2 diabetes as treatment option for SARS-CoV-2 infections. These computational studies led to the identification of three marketed DPP4 inhibitors; gemigliptin, linagliptin and evogliptin as potential inhibitors of SARS-CoV-2 M
    Language English
    Publishing date 2021-01-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2193542-7
    ISSN 1424-8247
    ISSN 1424-8247
    DOI 10.3390/ph14010044
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