1
|
Li M, Castro Lingl S, Yang J. Reduction of hemagglutination induced by a SARS-CoV-2 spike protein fragment using an amyloid-binding benzothiazole amphiphile. Sci Rep 2024; 14:12317. [PMID: 38811619 PMCID: PMC11137076 DOI: 10.1038/s41598-024-59585-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 04/12/2024] [Indexed: 05/31/2024] Open
Abstract
COVID-19 infection is associated with a variety of vascular occlusive morbidities. However, a comprehensive understanding of how this virus can induce vascular complications remains lacking. Here, we show that a peptide fragment of SARS-CoV-2 spike protein, S192 (sequence 192-211), is capable of forming amyloid-like aggregates that can induce agglutination of red blood cells, which was not observed with low- and non-aggregated S192 peptide. We subsequently screened eight amyloid-binding molecules and identified BAM1-EG6, a benzothiazole amphiphile, as a promising candidate capable of binding to aggregated S192 and partially inhibiting its agglutination activity. These results provide new insight into a potential molecular mechanism for the capability of spike protein metabolites to contribute to COVID-19-related blood complications and suggest a new therapeutic approach for combating microvascular morbidities in COVID-19 patients.
Collapse
Affiliation(s)
- Meihan Li
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, 92093-0358, USA
| | - Sascha Castro Lingl
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, 92093-0358, USA
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, 92093-0358, USA.
| |
Collapse
|
2
|
Sheik DA, Dewhurst S, Yang J. Natural Seminal Amyloids as Targets for Development of Synthetic Inhibitors of HIV Transmission. Acc Chem Res 2017; 50:2159-2166. [PMID: 28809479 DOI: 10.1021/acs.accounts.7b00154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Amyloids refer to a class of protein or peptide aggregates that are heterogeneous in size, morphology, and composition, and are implicated to play a central role in many neurodegenerative and systemic diseases. The strong correlation between biological activity and extent of aggregation of amyloidogenic proteins and peptides has led to an explosion of research efforts to target these materials with synthetic molecules or engineered antibodies to try to attenuate their function in disease pathology. Although many of these efforts to attenuate amyloid function have shown great promise in laboratory settings, the vast majority of work has been focused on targeting amyloids associated with neurologic diseases, which has been met with significant additional challenges that preclude clinical evaluation. Only recently have researchers started applying their efforts toward neutralizing the activity of amyloids associated with non-neurologic diseases. For instance, small peptides present in high abundance in human semen have been found to aggregate into amyloid-like fibrils, with in vitro experiments indicating that these amyloid fibrils could potentially increase the rate of infection of pathogens such as HIV by over 400 000-fold during sexual contact. Mechanistic investigations of naturally occurring seminal amyloid species such as Semen-derived Enhancer of Virus Infection (SEVI) and related natural peptide aggregates suggest that these materials interact strongly with virus particles and cell surfaces, facilitating viral attachment and internalization into cells and, thus, possibly promoting sexual transmission of disease. Such amyloid mediators in HIV transmission represent an attractive target for development of chemical approaches to attenuate their biological activity. For instance, the activity of seminal amyloids in genital fluids potentially allows for topical delivery of amyloid-targeting molecules, which could minimize common problems with systemic toxicity or permeability across biological barriers. In addition, molecules that target these amyloid mediators in viral attachment could potentially work synergistically with current antiviral agents to reduce the rate of HIV transmission. This Account will briefly summarize some of the key evidence in support of the capability of SEVI to enhance viral infection, and will highlight examples, many from our group, of recent efforts aimed at inhibiting its activity using synthetic small molecules, oligomeric peptides, and polymeric materials. We present various chemical strategies that have shown promise for neutralizing the role of SEVI in HIV transmission including the development of aggregation inhibitors of SEVI fibril formation, small molecule amyloid binders that modulate the charge or structure of SEVI, and synthetic molecules that form bioresistive coatings on SEVI and inhibit its interaction with the virus or cell surface. We discuss some unique challenges that hamper translation of these molecular strategies toward clinical evaluation, and propose several opportunities for researchers to address these challenges.
Collapse
Affiliation(s)
- Daniel A. Sheik
- Department
of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Stephen Dewhurst
- Department
of Microbiology and Immunology, University of Rochester, Rochester, New York 14642, United States
| | - Jerry Yang
- Department
of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| |
Collapse
|
3
|
Sheik DA, Chamberlain JM, Brooks L, Clark M, Kim YH, Leriche G, Kubiak CP, Dewhurst S, Yang J. Hydrophobic Nanoparticles Reduce the β-Sheet Content of SEVI Amyloid Fibrils and Inhibit SEVI-Enhanced HIV Infectivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2596-2602. [PMID: 28207276 DOI: 10.1021/acs.langmuir.6b04295] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Semen-derived enhancer of virus infection (SEVI) fibrils are naturally abundant amyloid aggregates found in semen that facilitate viral attachment and internalization of human immunodeficiency virus (HIV) in cells, thereby increasing the probability of infection. Mature SEVI fibrils are composed of aggregated peptides exhibiting high β-sheet secondary structural characteristics. Herein, we show that polymers containing hydrophobic side chains can interact with SEVI and reduce its β-sheet content by ∼45% compared with the β-sheet content of SEVI in the presence of polymers with hydrophilic side chains, as estimated by polarization modulation-infrared reflectance absorption spectroscopy measurements. A nanoparticle (NP) formulation of this hydrophobic polymer reduced SEVI-mediated HIV infection in TMZ-bl cells by 60% compared with the control treatment. Although these NPs lacked specific amyloid-targeting groups, thus requiring high concentrations to observe biological activity, the use of hydrophobic interactions to alter the secondary structure of amyloids represents a useful approach to neutralizing the SEVI function. These results could, therefore, have general implications in the design of novel materials that can modify the activity of amyloids associated with a variety of other neurological and systemic diseases.
Collapse
Affiliation(s)
- Daniel A Sheik
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Jeffrey M Chamberlain
- Department of Microbiology and Immunology, University of Rochester , Rochester, New York 14642, United States
| | - Lauren Brooks
- Department of Microbiology and Immunology, University of Rochester , Rochester, New York 14642, United States
| | - Melissa Clark
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Young Hun Kim
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Geoffray Leriche
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Clifford P Kubiak
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Stephen Dewhurst
- Department of Microbiology and Immunology, University of Rochester , Rochester, New York 14642, United States
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| |
Collapse
|
4
|
Proteins behaving badly. Substoichiometric molecular control and amplification of the initiation and nature of amyloid fibril formation: lessons from and for blood clotting. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2017; 123:16-41. [DOI: 10.1016/j.pbiomolbio.2016.08.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 08/14/2016] [Accepted: 08/19/2016] [Indexed: 02/08/2023]
|
5
|
|
6
|
Lee NJ, Song JM, Cho HJ, Sung YM, Lee T, Chung A, Hong SH, Cifelli JL, Rubinshtein M, Habib LK, Capule CC, Turner RS, Pak DTS, Yang J, Hoe HS. Hexa (ethylene glycol) derivative of benzothiazole aniline promotes dendritic spine formation through the RasGRF1-Ras dependent pathway. Biochim Biophys Acta Mol Basis Dis 2015; 1862:284-95. [PMID: 26675527 DOI: 10.1016/j.bbadis.2015.12.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 11/16/2015] [Accepted: 12/04/2015] [Indexed: 11/24/2022]
Abstract
Our recent study demonstrated that an amyloid-β binding molecule, BTA-EG4, increases dendritic spine number via Ras-mediated signaling. To potentially optimize the potency of the BTA compounds, we synthesized and evaluated an amyloid-β binding analog of BTA-EG4 with increased solubility in aqueous solution, BTA-EG6. We initially examined the effects of BTA-EG6 on dendritic spine formation and found that BTA-EG6-treated primary hippocampal neurons had significantly increased dendritic spine number compared to control treatment. In addition, BTA-EG6 significantly increased the surface level of AMPA receptors. Upon investigation into the molecular mechanism by which BTA-EG6 promotes dendritic spine formation, we found that BTA-EG6 may exert its effects on spinogenesis via RasGRF1-ERK signaling, with potential involvement of other spinogenesis-related proteins such as Cdc42 and CDK5. Taken together, our data suggest that BTA-EG6 boosts spine and synapse number, which may have a beneficial effect of enhancing neuronal and synaptic function in the normal healthy brain.
Collapse
Affiliation(s)
- Nathanael J Lee
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jung Min Song
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Hyun-Ji Cho
- Department of Neural Development and Disease, Korea Brain Research Institute (KBRI), Cheomdan-ro, Dong-gu, Daegu 701-300, Republic of Korea
| | - You Me Sung
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA; Department of Neurology, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Taehee Lee
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Andrew Chung
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Sung-Ha Hong
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA; Department of Neurology, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jessica L Cifelli
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
| | - Mark Rubinshtein
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
| | - Lila K Habib
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Christina C Capule
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
| | - R Scott Turner
- Department of Neurology, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Daniel T S Pak
- Department of Pharmacology, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
| | - Hyang-Sook Hoe
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA; Department of Neurology, Georgetown University Medical Center, Washington, DC 20057, USA; Department of Neural Development and Disease, Korea Brain Research Institute (KBRI), Cheomdan-ro, Dong-gu, Daegu 701-300, Republic of Korea.
| |
Collapse
|
7
|
Sheik DA, Brooks L, Frantzen K, Dewhurst S, Yang J. Inhibition of the enhancement of infection of human immunodeficiency virus by semen-derived enhancer of virus infection using amyloid-targeting polymeric nanoparticles. ACS NANO 2015; 9:1829-1836. [PMID: 25619867 PMCID: PMC4426188 DOI: 10.1021/nn5067254] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The semen-derived enhancer of virus infection (SEVI) is a natural amyloid material that has been shown to substantially increase viral attachment and infectivity of HIV in cells. We previously reported that synthetic monomeric and oligomeric amyloid-targeting molecules could form protein-resistive coatings on SEVI and inhibit SEVI- and semen-mediated enhancement of HIV infectivity. While oligomeric amyloid-binding compounds showed substantial improvement in apparent binding to SEVI compared to monomeric compounds, we observed only a modest correlation between apparent binding to SEVI and activity for reducing SEVI-mediated HIV infection. Here, we synthesized amyloid-binding polyacrylate-based polymers and polymeric nanoparticles of comparable size to HIV virus particles (∼150 nm) to assess the effect of sterics on the inhibition of SEVI-mediated enhancement of HIV infectivity. We show that these polymeric materials exhibit excellent capability to reduce SEVI-mediated enhancement of HIV infection, with the nanoparticles exhibiting the greatest activity (IC50 value of ∼4 μg/mL, or 59 nM based on polymer) of any SEVI-neutralizing agent reported to date. The results support that the improved activity of these nanomaterials is likely due to their increased size (diameters = 80-200 nm) compared to amyloid-targeting small molecules and that steric interactions may play as important a role as binding affinity in inhibiting viral infection mediated by SEVI amyloids. In contrast to the previously reported SEVI-neutralizing, amyloid-targeting molecules (which required concentrations at least 100-fold above the Kd to observe activity), the approximate 1:1 ratio of apparent Kd to IC50 for activity of these polymeric materials suggests the majority of polymer molecules that are bound to SEVI contribute to the inhibition of HIV infectivity enhanced by SEVI. Such size-related effects on physical inhibition of protein-protein interactions may open further opportunities for the use of targeted nanomaterials in disease intervention.
Collapse
Affiliation(s)
- Daniel A. Sheik
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla CA 92093-0358, United States
| | - Lauren Brooks
- Department of Microbiology and Immunology, University of Rochester, Rochester, New York 14642, United States
| | - Kristen Frantzen
- Department of Microbiology and Immunology, University of Rochester, Rochester, New York 14642, United States
| | - Stephen Dewhurst
- Department of Microbiology and Immunology, University of Rochester, Rochester, New York 14642, United States
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla CA 92093-0358, United States
| |
Collapse
|
8
|
Chilumuri A, Odell M, Milton NGN. Benzothiazole aniline tetra(ethylene glycol) and 3-amino-1,2,4-triazole inhibit neuroprotection against amyloid peptides by catalase overexpression in vitro. ACS Chem Neurosci 2013; 4:1501-12. [PMID: 23968537 DOI: 10.1021/cn400146a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Alzheimer's disease, Familial British dementia, Familial Danish dementia, Type 2 diabetes mellitus, plus Creutzfeldt-Jakob disease are associated with amyloid fibril deposition and oxidative stress. The antioxidant enzyme catalase is a neuroprotective amyloid binding protein. Herein the effects of catalase overexpression in SH-SY5Y neuronal cells on the toxicity of amyloid-β (Aβ), amyloid-Bri (ABri), amyloid-Dan (ADan), amylin (IAPP), and prion protein (PrP) peptides were determined. Results showed catalase overexpression was neuroprotective against Aβ, ABri, ADan, IAPP, and PrP peptides. The catalase inhibitor 3-amino-1,2,4-triazole (3-AT) and catalase-amyloid interaction inhibitor benzothiazole aniline tetra(ethylene glycol) (BTA-EG4) significantly enhanced neurotoxicity of amyloid peptides in catalase overexpressing neuronal cells. This suggests catalase neuroprotection involves breakdown of hydrogen peroxide (H2O2) plus a direct binding interaction between catalase and the Aβ, ABri, ADan, IAPP, and PrP peptides. Kisspeptin 45-50 had additive neuroprotective actions against the Aβ peptide in catalase overexpressing cells. The effects of 3-AT had an intracellular site of action, while catalase-amyloid interactions had an extracellular component. These results suggest that the 3-AT and BTA-EG4 compounds may be able to inhibit endogenous catalase mediated neuroprotection. Use of BTA-EG4, or compounds that inhibit catalase binding to amyloid peptides, as potential therapeutics for Neurodegenerative diseases may therefore result in unwanted effects.
Collapse
Affiliation(s)
- Amrutha Chilumuri
- Department of Human & Health Sciences and ‡Department of Molecular & Applied Biosciences, Faculty of Science & Technology, University of Westminster, 115 New Cavendish Street, London W1W 6UW, United Kingdom
| | - Mark Odell
- Department of Human & Health Sciences and ‡Department of Molecular & Applied Biosciences, Faculty of Science & Technology, University of Westminster, 115 New Cavendish Street, London W1W 6UW, United Kingdom
| | - Nathaniel G. N. Milton
- Department of Human & Health Sciences and ‡Department of Molecular & Applied Biosciences, Faculty of Science & Technology, University of Westminster, 115 New Cavendish Street, London W1W 6UW, United Kingdom
| |
Collapse
|
9
|
Kouyoumdjian H, Zhu DC, El-Dakdouki MH, Lorenz K, Chen J, Li W, Huang X. Glyconanoparticle aided detection of β-amyloid by magnetic resonance imaging and attenuation of β-amyloid induced cytotoxicity. ACS Chem Neurosci 2013; 4:575-84. [PMID: 23590250 PMCID: PMC3629742 DOI: 10.1021/cn3002015] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 01/07/2013] [Indexed: 01/01/2023] Open
Abstract
The development of a noninvasive method for the detection of Alzheimer's disease is of high current interest, which can be critical in early diagnosis and in guiding treatment of the disease. The aggregates of β-amyloid are a pathological hallmark of Alzheimer's disease. Carbohydrates such as gangliosides have been shown to play significant roles in initiation of amyloid aggregation. Herein, we report a biomimetic approach using superparamagnetic iron oxide glyconanoparticles to detect β-amyloid. The bindings of β-amyloid by the glyconanoparticles were demonstrated through several techniques including enzyme linked immunosorbent assay, gel electrophoresis, tyrosine fluorescence assay, and transmission electron microscopy. The superparamagnetic nature of the nanoparticles allowed easy detection of β-amyloid both in vitro and ex vivo by magnetic resonance imaging. Furthermore, the glyconanoparticles not only were nontoxic to SH-SY5Y neuroblastoma cells but also greatly reduced β-amyloid induced cytotoxicity to cells, highlighting the potential of these nanoparticles for detection and imaging of β-amyloid.
Collapse
Affiliation(s)
- Hovig Kouyoumdjian
- Department of Chemistry, 578 S. Shaw Lane, Room 426, Michigan State University, East Lansing, Michigan 48824,
United States
| | - David C. Zhu
- Departments
of Radiology and Psychology, Michigan State University, East Lansing, Michigan 48824, United States
| | - Mohammad H. El-Dakdouki
- Department of Chemistry, 578 S. Shaw Lane, Room 426, Michigan State University, East Lansing, Michigan 48824,
United States
| | - Kelly Lorenz
- Department of Chemistry, 578 S. Shaw Lane, Room 426, Michigan State University, East Lansing, Michigan 48824,
United States
| | - Jianjun Chen
- Department of Pharmaceutical Sciences, College
of Pharmacy, University of Tennessee Health Science Center, 847 Monroe Avenue, Memphis, Tennessee 38163, United States
| | - Wei Li
- Department of Pharmaceutical Sciences, College
of Pharmacy, University of Tennessee Health Science Center, 847 Monroe Avenue, Memphis, Tennessee 38163, United States
| | - Xuefei Huang
- Department of Chemistry, 578 S. Shaw Lane, Room 426, Michigan State University, East Lansing, Michigan 48824,
United States
| |
Collapse
|
10
|
Cisek K, Jensen JR, Honson NS, Schafer KN, Cooper GL, Kuret J. Ligand electronic properties modulate tau filament binding site density. Biophys Chem 2012; 170:25-33. [PMID: 23072817 DOI: 10.1016/j.bpc.2012.09.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 09/05/2012] [Accepted: 09/06/2012] [Indexed: 10/27/2022]
Abstract
Small molecules that bind tau-bearing neurofibrillary lesions are being sought for premortem diagnosis, staging, and treatment of Alzheimer's disease and other tauopathic neurodegenerative diseases. The utility of these agents will depend on both their binding affinity and binding site density (B(max)). Previously we identified polarizability as a descriptor of protein aggregate binding affinity. To examine its contribution to binding site density, we investigated the ability of two closely related benzothiazole derivatives ((E)-2-[[4-(dimethylamino)phenyl]azo]-6-methoxybenzothiazole) and ((E)-2-[2-[4-(dimethylamino)phenyl]ethenyl]-6-methoxybenzothiazole) that differed in polarizability to displace probes of high (Thioflavin S) and low (radiolabeled (E,E)-1-iodo-2,5-bis(3-hydroxycarbonyl-4-methoxy)styrylbenzene; IMSB) density sites. Consistent with their site densities, Thioflavin S completely displaced radiolabeled IMSB, but IMSB was incapable of displacing Thioflavin S. Although both benzothiazoles displaced the low B(max) IMSB probe, only the highly polarizable analog displaced near saturating concentrations of the Thioflavin S probe. Quantum calculations showed that high polarizability reflected extensive pi-electron delocalization fostered by the presence of electron donating and accepting groups. These data suggest that electron delocalization promotes ligand binding at a subset of sites on tau aggregates that are present at high density, and that optimizing this aspect of ligand structure can yield tau-directed agents with superior diagnostic and therapeutic performance.
Collapse
Affiliation(s)
- Katryna Cisek
- Department of Molecular and Cellular Biochemistry, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | | | | | | | | | | |
Collapse
|
11
|
Capule CC, Yang J. Enzyme-linked immunosorbent assay-based method to quantify the association of small molecules with aggregated amyloid peptides. Anal Chem 2012; 84:1786-91. [PMID: 22243436 DOI: 10.1021/ac2030859] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This paper describes a simple enzyme linked immunosorbent assay (ELISA) protocol for quantifying the binding of small molecules to aggregated β-amyloid (Aβ) peptides. Amyloid-targeting small molecules have attracted wide interest as potential agents for the treatment or diagnosis of neurodegenerative disorders such as Alzheimer's disease. The lack of general methods to evaluate small molecule-amyloid binding interactions, however, has significantly limited the number of amyloid-targeting molecules that have been studied to date. Here, we demonstrate a general method to quantify small molecule-amyloid binding interactions via a modified quantitative ELISA protocol. A key feature of this protocol is the treatment of commercial ELISA plates with an air plasma to help maintain the desired β-sheet content of the aggregated Aβ upon immobilization of these peptides on to the polystyrene surface. We developed an ELISA-based competition assay on these air plasma-treated plates and evaluated the binding of five previously known amyloid-binding small molecules to aggregated Aβ. We show that this general ELISA-based competition assay can be used to quantify small molecule-amyloid binding interactions in the low nanomolar to low micromolar range, which is the typical range of affinities for many amyloid-targeting diagnostic agents under current development. This simple protocol for quantifying the interaction of small molecules with aggregated Aβ peptides overcomes many limitations of previously reported spectroscopic or radioactivity assays and may, therefore, facilitate the screening and evaluation of a more structurally diverse set of amyloid-targeting agents than had previously been possible.
Collapse
Affiliation(s)
- Christina C Capule
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA
| | | |
Collapse
|
12
|
Capule CC, Brown C, Olsen JS, Dewhurst S, Yang J. Oligovalent amyloid-binding agents reduce SEVI-mediated enhancement of HIV-1 infection. J Am Chem Soc 2012; 134:905-8. [PMID: 22239120 PMCID: PMC3262105 DOI: 10.1021/ja210931b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This paper evaluates the use of oligovalent amyloid-binding molecules as potential agents that can reduce the enhancement of human immunodeficiency virus-1 (HIV-1) infection in cells by semen-derived enhancer of virus infection (SEVI) fibrils. These naturally occurring amyloid fibrils found in semen have been implicated as mediators that can facilitate the attachment and internalization of HIV-1 virions to immune cells. Molecules that are capable of reducing the role of SEVI in HIV-1 infection may, therefore, represent a novel strategy to reduce the rate of sexual transmission of HIV-1 in humans. Here, we evaluated a set of synthetic, oligovalent derivatives of benzothiazole aniline (BTA, a known amyloid-binding molecule) for their capability to bind cooperatively to aggregated amyloid peptides and to neutralize the effects of SEVI in HIV-1 infection. We demonstrate that these BTA derivatives exhibit a general trend of increased binding to aggregated amyloids as a function of increasing valence number of the oligomer. Importantly, we find that oligomers of BTA show improved capability to reduce SEVI-mediated infection of HIV-1 in cells compared to a BTA monomer, with the pentamer exhibiting a 65-fold improvement in efficacy compared to a previously reported monomeric BTA derivative. These results, thus, support the use of amyloid-targeting molecules as potential supplements for microbicides to curb the spread of HIV-1 through sexual contact.
Collapse
Affiliation(s)
- Christina C. Capule
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093-0358
| | - Caitlin Brown
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642
| | - Joanna S. Olsen
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642
| | - Stephen Dewhurst
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093-0358
| |
Collapse
|
13
|
A role for amyloid in cell aggregation and biofilm formation. PLoS One 2011; 6:e17632. [PMID: 21408122 PMCID: PMC3050909 DOI: 10.1371/journal.pone.0017632] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Accepted: 02/04/2011] [Indexed: 01/09/2023] Open
Abstract
Cell adhesion molecules in Saccharomyces cerevisiae and Candida albicans contain amyloid-forming sequences that are highly conserved. We have now used site-specific mutagenesis and specific peptide perturbants to explore amyloid-dependent activity in the Candida albicans adhesin Als5p. A V326N substitution in the amyloid-forming region conserved secondary structure and ligand binding, but abrogated formation of amyloid fibrils in soluble Als5p and reduced cell surface thioflavin T fluorescence. When displayed on the cell surface, Als5p with this substitution prevented formation of adhesion nanodomains and formation of large cellular aggregates and model biofilms. In addition, amyloid nanodomains were regulated by exogenous peptides. An amyloid-forming homologous peptide rescued aggregation and biofilm activity of Als5pV326N cells, and V326N substitution peptide inhibited aggregation and biofilm activity in Als5pWT cells. Therefore, specific site mutation, inhibition by anti-amyloid peturbants, and sequence-specificity of pro-amyloid and anti-amyloid peptides showed that amyloid formation is essential for nanodomain formation and activation.
Collapse
|
14
|
Habib LK, Lee MTC, Yang J. Inhibitors of catalase-amyloid interactions protect cells from beta-amyloid-induced oxidative stress and toxicity. J Biol Chem 2010; 285:38933-43. [PMID: 20923778 PMCID: PMC2998107 DOI: 10.1074/jbc.m110.132860] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2010] [Revised: 09/03/2010] [Indexed: 01/09/2023] Open
Abstract
Compelling evidence shows a strong correlation between accumulation of neurotoxic β-amyloid (Aβ) peptides and oxidative stress in the brains of patients afflicted with Alzheimer disease (AD). One hypothesis for this correlation involves the direct and harmful interaction of aggregated Aβ peptides with enzymes responsible for maintaining normal, cellular levels of reactive oxygen species (ROS). Identification of specific, destructive interactions of Aβ peptides with cellular anti-oxidant enzymes would represent an important step toward understanding the pathogenicity of Aβ peptides in AD. This report demonstrates that exposure of human neuroblastoma cells to cytotoxic preparations of aggregated Aβ peptides results in significant intracellular co-localization of Aβ with catalase, an anti-oxidant enzyme responsible for catalyzing the degradation of the ROS intermediate hydrogen peroxide (H(2)O(2)). These catalase-Aβ interactions deactivate catalase, resulting in increased cellular levels of H(2)O(2). Furthermore, small molecule inhibitors of catalase-amyloid interactions protect the hydrogen peroxide-degrading activity of catalase in Aβ-rich environments, leading to reduction of the co-localization of catalase and Aβ in cells, inhibition of Aβ-induced increases in cellular levels of H(2)O(2), and reduction of the toxicity of Aβ peptides. These studies, thus, provide evidence for the important role of intracellular catalase-amyloid interactions in Aβ-induced oxidative stress and propose a novel molecular strategy to inhibit such harmful interactions in AD.
Collapse
Affiliation(s)
| | - Michelle T. C. Lee
- Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Jerry Yang
- Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
| |
Collapse
|
15
|
Qin L, Vastl J, Gao J. Highly sensitive amyloid detection enabled by thioflavin T dimers. MOLECULAR BIOSYSTEMS 2010; 6:1791-5. [DOI: 10.1039/c005255h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Sutharsan J, Dakanali M, Capule CC, Haidekker MA, Yang J, Theodorakis EA. Rational design of amyloid binding agents based on the molecular rotor motif. ChemMedChem 2010; 5:56-60. [PMID: 20024978 PMCID: PMC2837554 DOI: 10.1002/cmdc.200900440] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Indexed: 11/07/2022]
Abstract
Alzheimer’s disease (AD) is characterized by a progressive loss of cognitive function and constitutes the most common and fatal neurodegenerative disorder.[1 ] Genetic and clinical evidence supports the hypothesis that accumulation of amyloid deposits in the brain plays an important role in the pathology of the disease. This event is associated with perturbations of biological functions in the surrounding tissue leading to neuronal cell death, thus contributing to the disease process. The deposits are comprised primarily of amyloid (Aβ) peptides, a 39–43 amino acid sequence that self aggregates into a fibrillar β-pleated sheet motif. While the exact three-dimensional structure of the aggregated Aβ peptides is not known, a model structure that sustains the property of aggregation has been proposed.[2 ] This creates opportunities for in vivo imaging of amyloid deposits that can not only help evaluate the time course and evolution of the disease, but can also allow the timely monitoring of therapeutic treatments.[3 ]
Collapse
Affiliation(s)
- Jeyanthy Sutharsan
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 (USA), Fax: (+1) 858-822-0386 (ET), Fax: (+1) 858-534-4554 (JY)
| | - Marianna Dakanali
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 (USA), Fax: (+1) 858-822-0386 (ET), Fax: (+1) 858-534-4554 (JY)
| | - Christina C. Capule
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 (USA), Fax: (+1) 858-822-0386 (ET), Fax: (+1) 858-534-4554 (JY)
| | - Mark A. Haidekker
- Faculty of Engineering, University of Georgia, Athens, GA 30602 (USA)
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 (USA), Fax: (+1) 858-822-0386 (ET), Fax: (+1) 858-534-4554 (JY)
| | - Emmanuel A. Theodorakis
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 (USA), Fax: (+1) 858-822-0386 (ET), Fax: (+1) 858-534-4554 (JY)
| |
Collapse
|
17
|
Chang PT, Kung FL, Talekar RS, Chen CS, Lai SY, Lee HY, Chern JW. An Improved Screening Model To Identify Inhibitors Targeting Zinc-Enhanced Amyloid Aggregation. Anal Chem 2009; 81:6944-51. [DOI: 10.1021/ac901011e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pei-Teh Chang
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Fan-Lu Kung
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Rahul Subhash Talekar
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Chien-Shu Chen
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Shin-Yu Lai
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Hsueh-Yun Lee
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| | - Ji-Wang Chern
- School of Pharmacy and Department of Life Science, College of Life Science, National Taiwan University, No. 1, Section 1, Ren-Ai Road, Taipei, 100, Taiwan, and School of Pharmacy, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 404, Taiwan
| |
Collapse
|
18
|
Capone R, Quiroz FG, Prangkio P, Saluja I, Sauer AM, Bautista MR, Turner RS, Yang J, Mayer M. Amyloid-beta-induced ion flux in artificial lipid bilayers and neuronal cells: resolving a controversy. Neurotox Res 2009; 16:1-13. [PMID: 19526294 PMCID: PMC2864106 DOI: 10.1007/s12640-009-9033-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 12/15/2008] [Accepted: 12/15/2008] [Indexed: 10/20/2022]
Abstract
Understanding the pathogenicity of amyloid-beta (Abeta) peptides constitutes a major goal in research on Alzheimer's disease (AD). One hypothesis entails that Abeta peptides induce uncontrolled, neurotoxic ion flux through cellular membranes. The exact biophysical mechanism of this ion flux is, however, a subject of an ongoing controversy which has attenuated progress toward understanding the importance of Abeta-induced ion flux in AD. The work presented here addresses two prevalent controversies regarding the nature of transmembrane ion flux induced by Alphabeta peptides. First, the results clarify that Alphabeta can induce stepwise ion flux across planar lipid bilayers as opposed to a gradual increase in transmembrane current; they show that the previously reported gradual thinning of membranes with concomitant increase in transmembrane current arises from residues of the solvent hexafluoroisopropanol, which is commonly used for the preparation of amyloid samples. Second, the results provide additional evidence suggesting that Abeta peptides can induce ion channel-like ion flux in cellular membranes that is independent from the postulated ability of Alphabeta to modulate intrinsic cellular ion channels or transporter proteins.
Collapse
Affiliation(s)
- Ricardo Capone
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave, Ann Arbor, MI 48109-2110, USA
| | - Felipe Garcia Quiroz
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave, Ann Arbor, MI 48109-2110, USA
| | - Panchika Prangkio
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave, Ann Arbor, MI 48109-2110, USA
| | | | - Anna M. Sauer
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave, Ann Arbor, MI 48109-2110, USA
| | - Mahealani R. Bautista
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, CA 92093-0358, USA
| | | | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, CA 92093-0358, USA
| | - Michael Mayer
- Departments of Biomedical Engineering and Chemical Engineering, University of Michigan, 1101 Beal Ave, Ann Arbor, MI 48109-2110, USA
| |
Collapse
|
19
|
Small-molecule mediated neuroprotection in an in situ model of tauopathy. Neurotox Res 2009; 15:274-83. [PMID: 19384600 DOI: 10.1007/s12640-009-9028-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Revised: 05/06/2008] [Accepted: 05/06/2008] [Indexed: 01/12/2023]
Abstract
Small-molecule inhibitors of neurofibrillary lesion formation may have utility for treatment of Alzheimer's disease and certain forms of frontotemporal lobar degeneration. These lesions are composed largely of tau protein, which aggregates to form intracellular fibrils in affected neurons. Previously it was shown that chronic overexpression of human tau protein within identified neurons (anterior bulbar cells) of the sea lamprey induced a phenotype-resembling tauopathic neurodegeneration, including the formation of tau filaments, fragmentation of dendritic arbors, and eventual cell death. Development of this neurodegenerative phenotype was blocked by chronic administration of a benzothiazole derivative termed N3 ((E)-2-[[4-(dimethylamino)phenyl]azo]-6-methoxybenzothiazole) to lamprey aquaria. Here we examined the mechanism of action of N3 and an alkene analog termed N4 ((E)-2-[2-[4-(dimethylamino)phenyl]ethenyl]-6-methoxybenzothiazole) in vitro and in the lamprey model. Results showed that although both compounds entered the lamprey central nervous system, only N3 arrested tauopathy. On the basis of in vitro aggregation assays, neither compound was capable of directly inhibiting tau filament formation. However, N3, but not N4, was capable of partially antagonizing the binding of Thioflavin S to synthetic tau filaments. The results suggest that occupancy of N3-binding sites on nascent tau filaments may significantly retard the progressive degeneration accompanying tau overexpression in lamprey.
Collapse
|
20
|
Inbar P, Bautista MR, Takayama SA, Yang J. Assay To Screen for Molecules That Associate with Alzheimer's Related β-Amyloid Fibrils. Anal Chem 2008; 80:3502-6. [DOI: 10.1021/ac702592f] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Petra Inbar
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| | - Mahealani R. Bautista
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| | - Stacy A. Takayama
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| |
Collapse
|
21
|
Hetényi A, Fülöp L, Martinek TA, Wéber E, Soós K, Penke B. Ligand-Induced Flocculation of Neurotoxic Fibrillar Aβ(1–42) by Noncovalent Crosslinking. Chembiochem 2008; 9:748-57. [DOI: 10.1002/cbic.200700351] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
22
|
Inbar P, Li CQ, Takayama SA, Bautista MR, Yang J. Oligo(ethylene glycol) derivatives of thioflavin T as inhibitors of protein-amyloid interactions. Chembiochem 2007; 7:1563-6. [PMID: 16927253 DOI: 10.1002/cbic.200600119] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Petra Inbar
- Department of Chemistry and Biochemistry, University of California, San Diego 9500 Gilman Drive, MC 0358, La Jolla, CA 92093-0358, USA
| | | | | | | | | |
Collapse
|
23
|
Affiliation(s)
- Stefan Jaroch
- Schering AG, Research Center Europe, Medicinal Chemistry, 13342 Berlin, Germany.
| |
Collapse
|