1
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Rhea EM, Leclerc M, Yassine HN, Capuano AW, Tong H, Petyuk VA, Macauley SL, Fioramonti X, Carmichael O, Calon F, Arvanitakis Z. State of the Science on Brain Insulin Resistance and Cognitive Decline Due to Alzheimer's Disease. Aging Dis 2024; 15:1688-1725. [PMID: 37611907 PMCID: PMC11272209 DOI: 10.14336/ad.2023.0814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 08/14/2023] [Indexed: 08/25/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) is common and increasing in prevalence worldwide, with devastating public health consequences. While peripheral insulin resistance is a key feature of most forms of T2DM and has been investigated for over a century, research on brain insulin resistance (BIR) has more recently been developed, including in the context of T2DM and non-diabetes states. Recent data support the presence of BIR in the aging brain, even in non-diabetes states, and found that BIR may be a feature in Alzheimer's disease (AD) and contributes to cognitive impairment. Further, therapies used to treat T2DM are now being investigated in the context of AD treatment and prevention, including insulin. In this review, we offer a definition of BIR, and present evidence for BIR in AD; we discuss the expression, function, and activation of the insulin receptor (INSR) in the brain; how BIR could develop; tools to study BIR; how BIR correlates with current AD hallmarks; and regional/cellular involvement of BIR. We close with a discussion on resilience to both BIR and AD, how current tools can be improved to better understand BIR, and future avenues for research. Overall, this review and position paper highlights BIR as a plausible therapeutic target for the prevention of cognitive decline and dementia due to AD.
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Affiliation(s)
- Elizabeth M Rhea
- Geriatric Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, WA 98108, USA.
- Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA 98195, USA.
| | - Manon Leclerc
- Faculty of Pharmacy, Laval University, Quebec, Quebec, Canada.
- Neuroscience Axis, CHU de Québec Research Center - Laval University, Quebec, Quebec, Canada.
| | - Hussein N Yassine
- Departments of Neurology and Medicine, University of Southern California, Los Angeles, CA 90033, USA.
| | - Ana W Capuano
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, IL 60612, USA.
| | - Han Tong
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, IL 60612, USA.
| | - Vladislav A Petyuk
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
| | - Shannon L Macauley
- Department of Physiology, University of Kentucky, Lexington, KY 40508, USA.
| | - Xavier Fioramonti
- International Associated Laboratory OptiNutriBrain, Bordeaux, France and Quebec, Canada.
- Univ. Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33000 Bordeaux, France.
| | - Owen Carmichael
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA.
| | - Frederic Calon
- Faculty of Pharmacy, Laval University, Quebec, Quebec, Canada.
- Neuroscience Axis, CHU de Québec Research Center - Laval University, Quebec, Quebec, Canada.
- International Associated Laboratory OptiNutriBrain, Bordeaux, France and Quebec, Canada.
| | - Zoe Arvanitakis
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, IL 60612, USA.
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2
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Suladze S, Sarkar R, Rodina N, Bokvist K, Krewinkel M, Scheps D, Nagel N, Bardiaux B, Reif B. Atomic resolution structure of full-length human insulin fibrils. Proc Natl Acad Sci U S A 2024; 121:e2401458121. [PMID: 38809711 PMCID: PMC11161806 DOI: 10.1073/pnas.2401458121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 05/02/2024] [Indexed: 05/31/2024] Open
Abstract
Patients with type 1 diabetes mellitus who are dependent on an external supply of insulin develop insulin-derived amyloidosis at the sites of insulin injection. A major component of these plaques is identified as full-length insulin consisting of the two chains A and B. While there have been several reports that characterize insulin misfolding and the biophysical properties of the fibrils, atomic-level information on the insulin fibril architecture remains elusive. We present here an atomic resolution structure of a monomorphic insulin amyloid fibril that has been determined using magic angle spinning solid-state NMR spectroscopy. The structure of the insulin monomer yields a U-shaped fold in which the two chains A and B are arranged in parallel to each other and are oriented perpendicular to the fibril axis. Each chain contains two β-strands. We identify two hydrophobic clusters that together with the three preserved disulfide bridges define the amyloid core structure. The surface of the monomeric amyloid unit cell is hydrophobic implicating a potential dimerization and oligomerization interface for the assembly of several protofilaments in the mature fibril. The structure provides a starting point for the development of drugs that bind to the fibril surface and disrupt secondary nucleation as well as for other therapeutic approaches to attenuate insulin aggregation.
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Affiliation(s)
- Saba Suladze
- Bavarian Nuclear Magnetic Resonance Center at the Department of Biosciences, School of Natural Sciences, Technische Universität München, Garching85747, Germany
- Helmholtz-Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Institute of Structural Biology, Neuherberg85764, Germany
| | - Riddhiman Sarkar
- Bavarian Nuclear Magnetic Resonance Center at the Department of Biosciences, School of Natural Sciences, Technische Universität München, Garching85747, Germany
- Helmholtz-Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Institute of Structural Biology, Neuherberg85764, Germany
| | - Natalia Rodina
- Bavarian Nuclear Magnetic Resonance Center at the Department of Biosciences, School of Natural Sciences, Technische Universität München, Garching85747, Germany
| | - Krister Bokvist
- Sanofi-Aventis Deutschland GmbH, Diabetes Research, Industriepark Höchst, Frankfurt65926, Germany
| | - Manuel Krewinkel
- Sanofi-Aventis Deutschland GmbH, Manufacturing Science and Technology, Industriepark Höchst, Frankfurt65926, Germany
| | - Daniel Scheps
- Chemistry Manufacturing & Controls Microbial Platform, Sanofi-Aventis Deutschland GmbH, Microbial Platform, Industriepark Höchst, Frankfurt65926, Germany
| | - Norbert Nagel
- Sanofi-Aventis Deutschland GmbH, Tides Platform, Industriepark Höchst, Frankfurt65926, Germany
| | - Benjamin Bardiaux
- Institut Pasteur, Department of Structural Biology and Chemistry, Structural Bioinformatics Unit, CNRS UMR 3528, Université Paris Cité, Paris75015, France
- Institut Pasteur, Department of Structural Biology and Chemistry, Bacterial Transmembrane Systems Unit, CNRS UMR 3528, Université Paris Cité, Paris75015, France
| | - Bernd Reif
- Bavarian Nuclear Magnetic Resonance Center at the Department of Biosciences, School of Natural Sciences, Technische Universität München, Garching85747, Germany
- Helmholtz-Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Institute of Structural Biology, Neuherberg85764, Germany
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3
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Ghosh S, Iyer LS, Chowdhury R, Addy PS. Nontoxic Aggregation-Induced Emissive Luminogen for the Detection of Amyloid Fibrils and Cellular Protein Aggregates. ACS APPLIED BIO MATERIALS 2023; 6:4592-4597. [PMID: 37890087 DOI: 10.1021/acsabm.3c00704] [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] [Indexed: 10/29/2023]
Abstract
Protein misfolding and aggregation resulting in amyloid formation is directly linked to various diseases. Hence, there is keen interest in developing probes for the selective detection of such misfolded aggregated proteins. In this paper, we have shown the use of a nontoxic aggregation-induced emissive luminogen (AIEgen), BIDCPV, for the selective detection of insulin amyloid fibrils and their various stages of formation. We further verified the selective response of BIDCPV toward amyloid fibrils by testing the probe against Aβ 42 peptides, which is well known to form the fibrils. Additionally, the low toxicity, efficient cellular internalization capability, and photostability make BIDCPV a unique candidate for sensing protein aggregates inside mammalian cells.
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Affiliation(s)
- Saurajit Ghosh
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Lavanya Suresh Iyer
- Department of Bio Science, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Rajdeep Chowdhury
- Department of Bio Science, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Partha Sarathi Addy
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan 333031, India
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4
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Bardineshin F, Bahramikia S, Khodarahmi R, Hadi F. Mesalazine Inhibits Amyloid Formation and Destabilizes Pre-formed Amyloid Fibrils in the Human Insulin. J Fluoresc 2023:10.1007/s10895-022-03142-7. [PMID: 36640210 DOI: 10.1007/s10895-022-03142-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 12/29/2022] [Indexed: 01/15/2023]
Abstract
Amyloid formation due to protein aggregation is associated with several amyloid diseases (amyloidosis). The use of small organic ligands as inhibitors of protein aggregation is an attractive strategy for the treatment of these diseases. In the present study, we evaluated the in vitro inhibitory and destabilizing effects of Mesalazine on human insulin fibrillation. To induce fibrillation, human insulin was incubated in 50 mM glycine buffer (pH 2.0) at 50 °C. The effect of Mesalazine on insulin amyloid aggregation was studied using spectroscopic, imaging, and computational approaches. Based on the results, the Mesalazine in a concentration-dependent manner (different ratios (1:0.1, 1:0.5, 1:1, and 1:5) of the insulin to Mesalazine) prevented the formation of amyloid fibrils and destabilized pre-formed fibrils. In addition, our molecular docking study confirmed the binding of Mesalazine to insulin through hydrogen bonds and hydrophobic interactions. Our findings suggest that Mesalazine may have therapeutic potential in the prevention of insulin amyloidosis and localized amyloidosis.
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Affiliation(s)
- Fatemeh Bardineshin
- Department of Biology, MSc of Biology, Lorestan University, Khorramabad, Iran
| | - Seifollah Bahramikia
- Department of Biology, Faculty of Basic Sciences, Lorestan University, Khorramabad, Iran.
| | - Reza Khodarahmi
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.,Department of Pharmacognosy and Biotechnology, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Faranak Hadi
- Department of Biology, Faculty of Basic Sciences, Lorestan University, Khorramabad, Iran
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5
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Fagihi MA, Bhattacharjee S. Amyloid Fibrillation of Insulin: Amelioration Strategies and Implications for Translation. ACS Pharmacol Transl Sci 2022; 5:1050-1061. [PMID: 36407954 PMCID: PMC9667547 DOI: 10.1021/acsptsci.2c00174] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Indexed: 11/29/2022]
Abstract
Insulin is a therapeutically relevant molecule with use in treating diabetes patients. Unfortunately, it undergoes a range of untoward and often unpredictable physical transformations due to alterations in its biochemical environment, including pH, ionic strength, temperature, agitation, and exposure to hydrophobic surfaces. The transformations are prevalent in its physiologically active monomeric form, while the zinc cation-coordinated hexamer, although physiologically inactive, is stable and less susceptible to fibrillation. The resultant molecular reconfiguration, including unfolding, misfolding, and hydrophobic interactions, often results in agglomeration, amyloid fibrillogenesis, and precipitation. As a result, a part of the dose is lost, causing a compromised therapeutic efficacy. Besides, the amyloid fibrils form insoluble deposits, trigger immunologic reactions, and harbor cytotoxic potential. The physical transformations also hold back a successful translation of non-parenteral insulin formulations, in addition to challenges related to encapsulation, chemical modification, purification, storage, and dosing. This review revisits the mechanisms and challenges that drive such physical transformations in insulin, with an emphasis on the observed amyloid fibrillation, and presents a critique of the current amelioration strategies before prioritizing some future research objectives.
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Affiliation(s)
- Megren
H. A. Fagihi
- School
of Medicine, University College Dublin (UCD), Belfield, Dublin 4, Ireland
- Clinical
Laboratory Sciences Department, College of Applied Medical Sciences, Najran University, Najran 55461, Kingdom
of Saudi Arabia
| | - Sourav Bhattacharjee
- School
of Veterinary Medicine, University College
Dublin (UCD), Belfield, Dublin 4, Ireland
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6
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Siposova K, Petrenko VI, Garcarova I, Sedlakova D, Almásy L, Kyzyma OA, Kriechbaum M, Musatov A. The intriguing dose-dependent effect of selected amphiphilic compounds on insulin amyloid aggregation: Focus on a cholesterol-based detergent, Chobimalt. Front Mol Biosci 2022; 9:955282. [PMID: 36060240 PMCID: PMC9437268 DOI: 10.3389/fmolb.2022.955282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 07/22/2022] [Indexed: 11/15/2022] Open
Abstract
The amyloidogenic self-assembly of many peptides and proteins largely depends on external conditions. Among amyloid-prone proteins, insulin attracts attention because of its physiological and therapeutic importance. In the present work, the amyloid aggregation of insulin is studied in the presence of cholesterol-based detergent, Chobimalt. The strategy to elucidate the Chobimalt-induced effect on insulin fibrillogenesis is based on performing the concentration- and time-dependent analysis using a combination of different experimental techniques, such as ThT fluorescence assay, CD, AFM, SANS, and SAXS. While at the lowest Chobimalt concentration (0.1 µM; insulin to Chobimalt molar ratio of 1:0.004) the formation of insulin fibrils was not affected, the gradual increase of Chobimalt concentration (up to 100 µM; molar ratio of 1:4) led to a significant increase in ThT fluorescence, and the maximal ThT fluorescence was 3-4-fold higher than the control insulin fibril's ThT fluorescence intensity. Kinetic studies confirm the dose-dependent experimental results. Depending on the concentration of Chobimalt, either (i) no effect is observed, or (ii) significantly, ∼10-times prolonged lag-phases accompanied by the substantial, ∼ 3-fold higher relative ThT fluorescence intensities at the steady-state phase are recorded. In addition, at certain concentrations of Chobimalt, changes in the elongation-phase are noticed. An increase in the Chobimalt concentrations also triggers the formation of insulin fibrils with sharply altered morphological appearance. The fibrils appear to be more flexible and wavy-like with a tendency to form circles. SANS and SAXS data also revealed the morphology changes of amyloid fibrils in the presence of Chobimalt. Amyloid aggregation requires the formation of unfolded intermediates, which subsequently generate amyloidogenic nuclei. We hypothesize that the different morphology of the formed insulin fibrils is the result of the gradual binding of Chobimalt to different binding sites on unfolded insulin. A similar explanation and the existence of such binding sites with different binding energies was shown previously for the nonionic detergent. Thus, the data also emphasize the importance of a protein partially-unfolded state which undergoes the process of fibrils formation; i.e., certain experimental conditions or the presence of additives may dramatically change not only kinetics but also the morphology of fibrillar aggregates.
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Affiliation(s)
- Katarina Siposova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Viktor I. Petrenko
- BCMaterials—Basque Center for Materials, Applications and Nanostructures, Leioa, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - Ivana Garcarova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Dagmar Sedlakova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - László Almásy
- Neutron Spectroscopy Department, Centre for Energy Research, Budapest, Hungary
| | - Olena A. Kyzyma
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
- Faculty of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
| | - Manfred Kriechbaum
- Institute of Inorganic Chemistry, Graz University of Technology, Graz, Austria
| | - Andrey Musatov
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
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7
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Ghosh A, Pawar AB, Chirmade T, Jathar SM, Bhambure R, Sengupta D, Giri AP, Kulkarni MJ. Investigation of the Captopril-Insulin Interaction by Mass Spectrometry and Computational Approaches Reveals that Captopril Induces Structural Changes in Insulin. ACS OMEGA 2022; 7:23115-23126. [PMID: 35847342 PMCID: PMC9280767 DOI: 10.1021/acsomega.2c00660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Post-translational modifications remarkably regulate proteins' biological function. Small molecules such as reactive thiols, metabolites, and drugs may covalently modify the proteins and cause structural changes. This study reports the covalent modification and noncovalent interaction of insulin and captopril, an FDA-approved antihypertensive drug, through mass spectrometric and computation-based approaches. Mass spectrometric analysis shows that captopril modifies intact insulin, reduces it into its "A" and "B" chains, and covalently modifies them by forming adducts. Since captopril has a reactive thiol group, it might reduce the insulin dimer or modify it by reacting with cysteine residues. This was proven with dithiothreitol treatment, which reduced the abundance of captopril adducts of insulin A and B chains and intact Insulin. Liquid chromatography tandem mass spectrometric analysis identified the modification of a total of four cysteine residues, two in each of the A and B chains of insulin. These modifications were identified to be Cys6 and Cys7 of the A chain and Cys7 and Cys19 of the B chain. Mass spectrometric analysis indicated that captopril may simultaneously modify the cysteine residues of intact insulin or its subunits A and B chains. Biophysical studies involving light scattering and thioflavin T assay suggested that the binding of captopril to the protein leads to the formation of aggregates. Docking and molecular dynamics studies provided insights into the noncovalent interactions and associated structural changes in insulin. This work is a maiden attempt to understand the detailed molecular interactions between captopril and insulin. These findings suggest that further investigations are required to understand the long-term effect of drugs like captopril.
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Affiliation(s)
- Amrita Ghosh
- Biochemical
Sciences Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Aiswarya B. Pawar
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Tejas Chirmade
- Chemical
Engineering and Process Development, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Swaraj M. Jathar
- Biochemical
Sciences Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rahul Bhambure
- Chemical
Engineering and Process Development, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Durba Sengupta
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ashok P. Giri
- Biochemical
Sciences Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Mahesh J. Kulkarni
- Biochemical
Sciences Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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8
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Das A, Shah M, Saraogi I. Molecular Aspects of Insulin Aggregation and Various Therapeutic Interventions. ACS BIO & MED CHEM AU 2022; 2:205-221. [PMID: 37101572 PMCID: PMC10114644 DOI: 10.1021/acsbiomedchemau.1c00054] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Protein aggregation leading to the formation of amyloid fibrils has various adverse effects on human health ranging from fatigue and numbness to organ failure and death in extreme cases. Insulin, a peptide hormone commonly used to treat diabetes, undergoes aggregation at the site of repeated injections in diabetic patients as well as during its industrial production and transport. The reduced bioavailability of insulin due to aggregation hinders the proper control of glucose levels in diabetic patients. Thus, it is necessary to develop rational approaches for inhibiting insulin aggregation, which in turn requires a detailed understanding of the mechanism of fibrillation. Given the relative simplicity of insulin and ease of access, insulin has also served as a model system for studying amyloids. Approaches to inhibit insulin aggregation have included the use of natural molecules, synthetic peptides or small molecules, and bacterial chaperone machinery. This review focuses on insulin aggregation with an emphasis on its mechanism, the structural features of insulin fibrils, and the reported inhibitors that act at different stages in the aggregation pathway. We discuss molecules that can serve as leads for improved inhibitors for use in commercial insulin formulations. We also discuss the aggregation propensity of fast- and slow-acting insulin biosimilars, commonly administered to diabetic patients. The development of better insulin aggregation inhibitors and insights into their mechanism of action will not only aid diabetic therapies, but also enhance our knowledge of protein amyloidosis.
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Affiliation(s)
- Anirban Das
- Department
of Chemistry and Department of Biological Sciences, Indian
Institute of Science Education and Research
Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Mosami Shah
- Department
of Chemistry and Department of Biological Sciences, Indian
Institute of Science Education and Research
Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Ishu Saraogi
- Department
of Chemistry and Department of Biological Sciences, Indian
Institute of Science Education and Research
Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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9
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Sen S, Ali R, Onkar A, Ganesh S, Verma S. Strategies for interference of insulin fibrillogenesis: challenges and advances. Chembiochem 2022; 23:e202100678. [PMID: 35025120 DOI: 10.1002/cbic.202100678] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/11/2022] [Indexed: 11/10/2022]
Abstract
The discovery of insulin came up with very high hopes for diabetic patients. In the year 2021, the world celebrated the 100 th anniversary of the discovery of this vital hormone. However, external use of insulin is highly affected by its aggregating tendency that occurs during its manufacturing, transportation, and improper handling which ultimately leads its pharmaceutically and biologically ineffective form. In this review, we aim to discuss the various approaches used for decelerating insulin aggregation which results in the enhancement of its overall structural stability and usage. The approaches that are discussed are broadly classified as either a measure through excipient additions or by intrinsic modifications in the insulin native structure.
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Affiliation(s)
- Shantanu Sen
- Indian Institute of Technology Kanpur, Chemistry, INDIA
| | - Rafat Ali
- Indian Institute of Technology Kanpur, Chemistry, Room No 131 Lab No2, CESE department IIT Kanpur, 208016, Kanpur, INDIA
| | - Akanksha Onkar
- Indian Institute of Technology Kanpur, Biological Sciences and Bioengineering, INDIA
| | - Subramaniam Ganesh
- Indian Institute of Technology Kanpur, Biological Sciences and Bioengineering, INDIA
| | - Sandeep Verma
- Indian Institute of Technology-Kanpur, Department of Chemistry, IIT-Kanpur, 208016, Kanpur, INDIA
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10
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Angelopoulou E, Paudel YN, Piperi C. Emerging role of S100B protein implication in Parkinson's disease pathogenesis. Cell Mol Life Sci 2021; 78:1445-1453. [PMID: 33052436 PMCID: PMC11073186 DOI: 10.1007/s00018-020-03673-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/10/2020] [Accepted: 10/05/2020] [Indexed: 01/08/2023]
Abstract
The exact etiology of Parkinson's disease (PD) remains obscure, lacking effective diagnostic and prognostic biomarkers. In search of novel molecular factors that may contribute to PD pathogenesis, emerging evidence highlights the multifunctional role of the calcium-binding protein S100B that is widely expressed in the brain and predominantly in astrocytes. Preclinical evidence points towards the possible time-specific contributing role of S100B in the pathogenesis of neurodegenerative disorders including PD, mainly by regulating neuroinflammation and dopamine metabolism. Although existing clinical evidence presents some contradictions, estimation of S100B in the serum and cerebrospinal fluid seems to hold a great promise as a potential PD biomarker, particularly regarding the severity of motor and non-motor PD symptoms. Furthermore, given the recent development of S100B inhibitors that are able to cross the blood brain barrier, novel opportunities are arising in the research field of PD therapeutics. In this review, we provide an update on recent advances in the implication of S100B protein in the pathogenesis of PD and discuss relevant studies investigating the biomarker potential of S100B in PD, aiming to shed more light on clinical targeting approaches related to this incurable disorder.
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Affiliation(s)
- Efthalia Angelopoulou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75 M. Asias Street, 11527, Athens, Greece
| | - Yam Nath Paudel
- Neuropharmacology Research Laboratory, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
| | - Christina Piperi
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75 M. Asias Street, 11527, Athens, Greece.
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11
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Badran AY, Gomaa AS, El-Mahdy RI, El Zohne RA, Kamal DT, Abou-Taleb DAE. Serum level of S100B in vitiligo patients: Is it a marker of disease activity? Australas J Dermatol 2020; 62:e67-e72. [PMID: 32951206 DOI: 10.1111/ajd.13462] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/18/2020] [Accepted: 08/07/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Vitiligo is a chronic depigmentary skin disorder, characterised clinically by the development of white macules and or patches caused by loss of epidermal melanocytes. S100B is a dual function protein released from epidermal melanocytes in response to injury. It considered a possible marker of disease activity in both malignant melanoma and vitiligo. AIM OF THE STUDY To estimate the serum level of S100B level in vitiligo patients and correlate its level with disease activity and various disease parameters. PATIENTS AND METHODS Sixty vitiligo patients and 60 healthy volunteers as controls were included in the study. Vitiligo Area Severity Index (VASI) and Vitiligo Disease Activity (VIDA) scores were estimated for each patient. Quantitative assessment of S100B level using ELISA technique was done for all participants. RESULTS S100B level was significantly correlated with the presence of vitiligo (P = 0.01), while it showed no correlation with the disease activity using VASI or VIDA scores. As regards the receiver operating characteristic (ROC) curve analysis of S100B for diagnosis and discrimination of vitiligo, serum S100B showed area under the curve (AUC) of 0.781 with 73.3% sensitivity and 80% specificity. CONCLUSION The serum level of S100B was related to the presence of vitiligo, but its level did not show any relation to the disease activity using either VASI and VIDA scores or various disease parameters.
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Affiliation(s)
- Aya Y Badran
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Ahmed Shawky Gomaa
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Reham I El-Mahdy
- Department of Medical Biochemistry, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Randa Ahmed El Zohne
- Department of Clinical Pathology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Dalia Tarik Kamal
- Department of Clinical Pathology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Doaa A E Abou-Taleb
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assiut, Egypt
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Yang QQ, He H, Li CQ, Luo LB, Li SL, Xu ZQ, Jin JC, Jiang FL, Liu Y, Yang M. Molecular Mechanisms of the Ultra-Strong Inhibition Effect of Oxidized Carbon Dots on Human Insulin Fibrillation. ACS APPLIED BIO MATERIALS 2019; 3:217-226. [DOI: 10.1021/acsabm.9b00725] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qi-Qi Yang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Huan He
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Chen-Qiao Li
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Lai-Bing Luo
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Shu-Lan Li
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Zi-Qiang Xu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (MOE), Hubei Province Key Laboratory of Industrial Biotechnology, Faculty of Materials Science & Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Jian-Cheng Jin
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Feng-Lei Jiang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Yi Liu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
- College of Chemistry and Material Sciences, Guangxi Teachers Education University, Nanning 530001, P. R. China
- Key Laboratory of Coal Conversion and Carbon Materials of Hubei Province, College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
| | - Mian Yang
- Key Laboratory of Coal Conversion and Carbon Materials of Hubei Province, College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
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13
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Chung LHC, Birch DJS, Vyshemirsky V, Ryadnov MG, Rolinski OJ. Tracking Insulin Glycation in Real Time by Time-Resolved Emission Spectroscopy. J Phys Chem B 2019; 123:7812-7817. [PMID: 31441653 DOI: 10.1021/acs.jpcb.9b06363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The application of time-resolved fluorescence sensing to the study of heterogenic biomolecular systems remains challenging because of the complexity of the resulting photophysics. Measuring the time-resolved emission spectroscopy (TRES) spectra can provide a more informative alternative to the modeling of the fluorescence decay that is currently employed. Here, we demonstrate this approach by monitoring real-time changes in intrinsic insulin fluorescence by TRES as a straightforward probe to directly measure kinetics of insulin aggregation and glycation. Our findings hold promise for monitoring the storage of insulin and its application in the control of diabetes and may support the development of more effective therapeutics against amyloidosis.
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Affiliation(s)
- Li Hung C Chung
- Photophysics Group, Centre for Molecular Nanometrology, Department of Physics, Scottish Universities Physics Alliance , University of Strathclyde , 107 Rottenrow East , Glasgow G4 0NG , U.K
| | - David J S Birch
- Photophysics Group, Centre for Molecular Nanometrology, Department of Physics, Scottish Universities Physics Alliance , University of Strathclyde , 107 Rottenrow East , Glasgow G4 0NG , U.K
| | - Vladislav Vyshemirsky
- School of Mathematics and Statistics , University of Glasgow , Glasgow G12 8QQ , U.K
| | - Maxim G Ryadnov
- National Physical Laboratory , Hampton Road , Teddington TW11 0LW , U.K
| | - Olaf J Rolinski
- Photophysics Group, Centre for Molecular Nanometrology, Department of Physics, Scottish Universities Physics Alliance , University of Strathclyde , 107 Rottenrow East , Glasgow G4 0NG , U.K
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14
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Fiory F, Perruolo G, Cimmino I, Cabaro S, Pignalosa FC, Miele C, Beguinot F, Formisano P, Oriente F. The Relevance of Insulin Action in the Dopaminergic System. Front Neurosci 2019; 13:868. [PMID: 31474827 PMCID: PMC6706784 DOI: 10.3389/fnins.2019.00868] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 08/02/2019] [Indexed: 12/13/2022] Open
Abstract
The advances in medicine, together with lifestyle modifications, led to a rising life expectancy. Unfortunately, however, aging is accompanied by an alarming boost of age-associated chronic pathologies, including neurodegenerative and metabolic diseases. Interestingly, a non-negligible interplay between alterations of glucose homeostasis and brain dysfunction has clearly emerged. In particular, epidemiological studies have pointed out a possible association between Type 2 Diabetes (T2D) and Parkinson’s Disease (PD). Insulin resistance, one of the major hallmark for etiology of T2D, has a detrimental influence on PD, negatively affecting PD phenotype, accelerating its progression and worsening cognitive impairment. This review aims to provide an exhaustive analysis of the most recent evidences supporting the key role of insulin resistance in PD pathogenesis. It will focus on the relevance of insulin in the brain, working as pro-survival neurotrophic factor and as a master regulator of neuronal mitochondrial function and oxidative stress. Insulin action as a modulator of dopamine signaling and of alpha-synuclein degradation will be described in details, too. The intriguing idea that shared deregulated pathogenic pathways represent a link between PD and insulin resistance has clinical and therapeutic implications. Thus, ongoing studies about the promising healing potential of common antidiabetic drugs such as metformin, exenatide, DPP IV inhibitors, thiazolidinediones and bromocriptine, will be summarized and the rationale for their use to decelerate neurodegeneration will be critically assessed.
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Affiliation(s)
- Francesca Fiory
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Giuseppe Perruolo
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Ilaria Cimmino
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Serena Cabaro
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Francesca Chiara Pignalosa
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Claudia Miele
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Francesco Beguinot
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Pietro Formisano
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Francesco Oriente
- Department of Translational Medicine, University of Naples Federico II, Naples, Italy.,URT "Genomic of Diabetes," Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
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Horvath I, Iashchishyn IA, Moskalenko RA, Wang C, Wärmländer SKTS, Wallin C, Gräslund A, Kovacs GG, Morozova-Roche LA. Co-aggregation of pro-inflammatory S100A9 with α-synuclein in Parkinson's disease: ex vivo and in vitro studies. J Neuroinflammation 2018; 15:172. [PMID: 29866153 PMCID: PMC5987543 DOI: 10.1186/s12974-018-1210-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 05/20/2018] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Chronic neuroinflammation is a hallmark of Parkinson's disease (PD) pathophysiology, associated with increased levels of pro-inflammatory factors in PD brain tissues. The pro-inflammatory mediator and highly amyloidogenic protein S100A9 is involved in the amyloid-neuroinflammatory cascade in Alzheimer's disease. This is the first report on the co-aggregation of α-synuclein (α-syn) and S100A9 both in vitro and ex vivo in PD brain. METHODS Single and sequential immunohistochemistry, immunofluorescence, scanning electron and atomic force (AFM) microscopies were used to analyze the ex vivo PD brain tissues for S100A9 and α-syn location and aggregation. In vitro studies revealing S100A9 and α-syn interaction and co-aggregation were conducted by NMR, circular dichroism, Thioflavin-T fluorescence, AFM, and surface plasmon resonance methods. RESULTS Co-localized and co-aggregated S100A9 and α-syn were found in 20% Lewy bodies and 77% neuronal cells in the substantia nigra; both proteins were also observed in Lewy bodies in PD frontal lobe (Braak stages 4-6). Lewy bodies were characterized by ca. 10-23 μm outer diameter, with S100A9 and α-syn being co-localized in the same lamellar structures. S100A9 was also detected in neurons and blood vessels of the aged patients without PD, but in much lesser extent. In vitro S100A9 and α-syn were shown to interact with each other via the α-syn C-terminus with an apparent dissociation constant of ca. 5 μM. Their co-aggregation occurred significantly faster and led to formation of larger amyloid aggregates than the self-assembly of individual proteins. S100A9 amyloid oligomers were more toxic than those of α-syn, while co-aggregation of both proteins mitigated the cytotoxicity of S100A9 oligomers. CONCLUSIONS We suggest that sustained neuroinflammation promoting the spread of amyloidogenic S100A9 in the brain tissues may trigger the amyloid cascade involving α-syn and S100A9 and leading to PD, similar to the effect of S100A9 and Aβ co-aggregation in Alzheimer's disease. The finding of S100A9 involvement in PD may open a new avenue for therapeutic interventions targeting S100A9 and preventing its amyloid self-assembly in affected brain tissues.
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Affiliation(s)
- Istvan Horvath
- Department of Medical Biochemistry and Biophysics, Umeå University, 90187, Umeå, Sweden
| | - Igor A Iashchishyn
- Department of Medical Biochemistry and Biophysics, Umeå University, 90187, Umeå, Sweden
- Department of General Chemistry, Sumy State University, Sumy, 40007, Ukraine
| | - Roman A Moskalenko
- Department of Medical Biochemistry and Biophysics, Umeå University, 90187, Umeå, Sweden
- Department of Pathology, Sumy State University, Sumy, 40007, Ukraine
| | - Chao Wang
- Department of Medical Biochemistry and Biophysics, Umeå University, 90187, Umeå, Sweden
| | | | - Cecilia Wallin
- Department of Biochemistry and Biophysics, Stockholm University, 10691, Stockholm, Sweden
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Stockholm University, 10691, Stockholm, Sweden
| | - Gabor G Kovacs
- Institute of Neurology, Medical University of Vienna, Vienna, Austria
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Fardell C, Zettergren A, Ran C, Carmine Belin A, Ekman A, Sydow O, Bäckman L, Holmberg B, Dizdar N, Söderkvist P, Nissbrandt H. S100B polymorphisms are associated with age of onset of Parkinson's disease. BMC MEDICAL GENETICS 2018. [PMID: 29529989 PMCID: PMC5848451 DOI: 10.1186/s12881-018-0547-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Background In this study we investigated the association between SNPs in the S100B gene and Parkinson’s disease (PD) in two independent Swedish cohorts. The SNP rs9722 has previously been shown to be associated with higher S100B concentrations in serum and frontal cortex in humans. S100B is widely expressed in the central nervous system and has many functions such as regulating calcium homeostasis, inflammatory processes, cytoskeleton assembly/disassembly, protein phosphorylation and degradation, and cell proliferation and differentiation. Several of these functions have been suggested to be of importance for the pathophysiology of PD. Methods The SNPs rs9722, rs2239574, rs881827, rs9984765, and rs1051169 of the S100B gene were genotyped using the KASPar® PCR SNP genotyping system in a case-control study of two populations (431 PD patients and 465 controls, 195 PD patients and 378 controls, respectively). The association between the genotype and allelic distributions and PD risk was evaluated using Chi-Square and Cox proportional hazards test, as well as logistic regression. Linear regression and Cox proportional hazards tests were applied to assess the effect of the rs9722 genotypes on age of disease onset. Results The S100B SNPs tested were not associated with the risk of PD. However, in both cohorts, the T allele of rs9722 was significantly more common in early onset PD patients compared to late onset PD patients. The SNP rs9722 was significantly related to age of onset, and each T allele lowered disease onset with 4.9 years. In addition, allelic variants of rs881827, rs9984765, and rs1051169, were significantly more common in early-onset PD compared to late-onset PD in the pooled population. Conclusions rs9722, a functional SNP in the 3’-UTR of the S100B gene, was strongly associated with age of onset of PD.
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Affiliation(s)
- Camilla Fardell
- Department of Pharmacology, Sahlgrenska Academy at the University of Gothenburg, P.O. Box 431, 405 30, Gothenburg, Sweden.
| | - Anna Zettergren
- Department of Pharmacology, Sahlgrenska Academy at the University of Gothenburg, P.O. Box 431, 405 30, Gothenburg, Sweden
| | - Caroline Ran
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | | | - Agneta Ekman
- Department of Pharmacology, Sahlgrenska Academy at the University of Gothenburg, P.O. Box 431, 405 30, Gothenburg, Sweden
| | - Olof Sydow
- Department of Clinical Neuroscience, Karolinska University Hospital, Stockholm, Sweden
| | - Lars Bäckman
- Aging Research Center, Karolinska Institutet, Stockholm, Sweden
| | - Björn Holmberg
- Department of Clinical Neuroscience and Rehabilitation, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - Nil Dizdar
- Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.,Department of Neurology, Linköping University Hospital, Linköping University, Linköping, Sweden
| | - Peter Söderkvist
- Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden
| | - Hans Nissbrandt
- Department of Pharmacology, Sahlgrenska Academy at the University of Gothenburg, P.O. Box 431, 405 30, Gothenburg, Sweden
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17
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Mudliar NH, Pettiwala AM, Awasthi AA, Singh PK. On the Molecular Form of Amyloid Marker, Auramine O, in Human Insulin Fibrils. J Phys Chem B 2016; 120:12474-12485. [PMID: 27973839 DOI: 10.1021/acs.jpcb.6b10078] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Designing extrinsic fluorescence sensors for amyloid fibrils is a very active and important area of research. Recently, an ultrafast molecule rotor dye, Auramine O (AuO), has been projected as a fluorescent amyloid marker. It has been claimed that AuO scores better than the most extensively utilized gold-standard amyloid probe, Thioflavin-T (ThT). This advantage arises from the fact that AuO, in addition to its usual emission band (∼500 nm), also displays a large red-shifted emission band (∼560 nm), exclusively in the presence of human insulin fibril medium and not in the native protein or buffer media. On the contrary, for ThT, the emission maximum (∼490 nm) largely remains unchanged while going from protein to fibril. This otherwise unknown large red-shifted emission band of AuO, observed in the presence of human insulin fibrils, was tentatively attributed to a species formed upon fast proton dissociation from excited AuO. It was proposed that because of the long excited-state lifetime (∼1.8 ns) of AuO upon association with human insulin fibrils, this fast proton dissociation from excited AuO could be observed, which is otherwise not observed in buffer or native protein media, owing to its very short excited-state lifetime (∼1 ps). Herein, we show that despite the long excited-state lifetime of AuO in other fibrillar media (human serum albumin and lysozyme), the new red-shifted emission band at 560 nm is not observed, thus possibly suggesting a different origin of the red-shifted emission band of AuO in human insulin fibril medium. We convincingly show that this red-shifted band of AuO (∼560 nm) could be observed under conditions that promote dye aggregation, such as a premicellar concentration of surfactants and polyelectrolytes. These AuO aggregates display strong emission wavelength dependence of transient decay traces, similar to that for AuO in human insulin fibril medium. Detailed time-resolved emission spectral (TRES) measurements suggest that the AuO/premicellar surfactant and AuO/human insulin fibril system share similar features, such as a dynamic red-shift in TRES and an isoemissive point in the time-resolved area-normalized emission spectra, suggesting that the characteristic red-shifted emission band of AuO in human insulin fibril medium may arise from AuO aggregates.
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Affiliation(s)
- Niyati H Mudliar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Aafrin M Pettiwala
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Ankur A Awasthi
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
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Valera E, Spencer B, Masliah E. Immunotherapeutic Approaches Targeting Amyloid-β, α-Synuclein, and Tau for the Treatment of Neurodegenerative Disorders. Neurotherapeutics 2016; 13:179-89. [PMID: 26494242 PMCID: PMC4720672 DOI: 10.1007/s13311-015-0397-z] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Disease-modifying alternatives are sorely needed for the treatment of neurodegenerative disorders, a group of diseases that afflict approximately 50 million Americans annually. Immunotherapy is one of the most developed approaches in this direction. Vaccination against amyloid-β, α-synuclein, or tau has been extensively explored, specially as the discovery that these proteins may propagate cell-to-cell and be accessible to antibodies when embedded into the plasma membrane or in the extracellular space. Likewise, the use of passive immunization approaches with specific antibodies against abnormal conformations of these proteins has also yielded promising results. The clinical development of immunotherapies for Alzheimer’s disease, Parkinson’s disease, frontotemporal dementia, dementia with Lewy bodies, and other neurodegenerative disorders is a field in constant evolution. Results to date suggest that immunotherapy is a promising therapeutic approach for neurodegenerative diseases that progress with the accumulation and prion-like propagation of toxic protein aggregates. Here we provide an overview of the most novel and relevant immunotherapeutic advances targeting amyloid-β in Alzheimer’s disease, α-synuclein in Alzheimer’s disease and Parkinson’s disease, and tau in Alzheimer’s disease and frontotemporal dementia.
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Affiliation(s)
- Elvira Valera
- grid.266100.30000000121074242Department of Neurosciences, University of California, La Jolla, San Diego, CA 92093 USA
| | - Brian Spencer
- grid.266100.30000000121074242Department of Neurosciences, University of California, La Jolla, San Diego, CA 92093 USA
| | - Eliezer Masliah
- grid.266100.30000000121074242Department of Neurosciences, University of California, La Jolla, San Diego, CA 92093 USA
- grid.266100.30000000121074242Department of Pathology, University of California, La Jolla, San Diego, CA 92093 USA
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Mishra NK, Krishna Deepak RNV, Sankararamakrishnan R, Verma S. Controlling in Vitro Insulin Amyloidosis with Stable Peptide Conjugates: A Combined Experimental and Computational Study. J Phys Chem B 2015; 119:15395-406. [DOI: 10.1021/acs.jpcb.5b08215] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Narendra Kumar Mishra
- Department of Chemistry, DST Thematic
Unit of Excellence on Soft
Nanofabrication and ‡Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016 Uttar Pradesh, India
| | - R. N. V. Krishna Deepak
- Department of Chemistry, DST Thematic
Unit of Excellence on Soft
Nanofabrication and ‡Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016 Uttar Pradesh, India
| | - Ramasubbu Sankararamakrishnan
- Department of Chemistry, DST Thematic
Unit of Excellence on Soft
Nanofabrication and ‡Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016 Uttar Pradesh, India
| | - Sandeep Verma
- Department of Chemistry, DST Thematic
Unit of Excellence on Soft
Nanofabrication and ‡Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016 Uttar Pradesh, India
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20
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Radoi V, Carsote M, Petris R, Paun D, Poiana C. MicroRNAs with Specific Roles in Diabetes and Psychiatric Diseases. ACTA ACUST UNITED AC 2014; 87:87-90. [PMID: 26528003 PMCID: PMC4620849 DOI: 10.15386/cjmed-288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 06/16/2014] [Indexed: 11/23/2022]
Abstract
Diabetes mellitus is one of the most cited non communicable diseases and the most common metabolic disorder. Epigenetics represents the field of study of heritable changes in gene expression which are not directly related to DNA. Epigenetics is concerned, alongside histone modifications, short interfering RNAs etc., with microRNAs (miRNAs) as well. These are small noncoding RNAs, 21 to 23 nucleotides in length, which either inhibit translation or affect mRNA stability and degradation. At present, there are dozens of miRNAs which have been proven to be involved in the animal and human pathology of diabetes (type 1 or 2). This review focuses on the miRNAs which have been identified as playing a role in both psychiatric diseases and diabetes.
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Affiliation(s)
- Valentin Radoi
- Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Mara Carsote
- Carol Davila University of Medicine and Pharmacy, Bucharest, Romania ; C. I. Parhon National Institute of Endocrinology, Bucharest, Romania
| | - Rodica Petris
- Carol Davila University of Medicine and Pharmacy, Bucharest, Romania ; C. I. Parhon National Institute of Endocrinology, Bucharest, Romania
| | - Diana Paun
- Carol Davila University of Medicine and Pharmacy, Bucharest, Romania ; C. I. Parhon National Institute of Endocrinology, Bucharest, Romania
| | - Catalina Poiana
- Carol Davila University of Medicine and Pharmacy, Bucharest, Romania ; C. I. Parhon National Institute of Endocrinology, Bucharest, Romania
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Maetzler W, Apel A, Langkamp M, Deuschle C, Dilger SS, Stirnkorb JG, Schulte C, Schleicher E, Gasser T, Berg D. Comparable autoantibody serum levels against amyloid- and inflammation-associated proteins in Parkinson's disease patients and controls. PLoS One 2014; 9:e88604. [PMID: 24586351 PMCID: PMC3931625 DOI: 10.1371/journal.pone.0088604] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 01/10/2014] [Indexed: 11/21/2022] Open
Abstract
Naturally occurring autoantibodies (NAbs) against a number of potentially disease-associated cellular proteins, including Amyloid-beta1–42 (Abeta1–42), Alpha-synuclein (Asyn), myelin basic protein (MBP), myelin oligodendrocyte glycoprotein (MOG), and S100 calcium binding protein B (S100B) have been suggested to be associated with neurodegenerative disorders, in particular Alzheimer’s (AD) and Parkinson’s disease (PD). Whereas the (reduced) occurrence of specific NAbs in AD is widely accepted, previous literature examining the relation of these NAb titres between PD patients and controls, as well as comparing these levels with demographic and clinical parameters in PD patients have produced inconsistent findings. We therefore aimed, in a cross-sectional approach, to determine serum titres of the above NAbs in a cohort of 93 PD patients (31 of them demented) and 194 controls. Levels were correlated with demographic and clinical variables, cerebrospinal fluid Abeta1–42, total tau and phospho-tau levels, as well as with single nucleotide polymorphisms (SNPs) of genes which either have been reported to influence the immune system, the amyloid cascade or the occurrence of PD (ApoE, GSK3B, HLA-DRA, HSPA5, SNCA, and STK39). The investigated NAb titres were neither significantly associated with the occurrence of PD, nor with demographic and clinical parameters, neurodegenerative markers or genetic variables. These results argue against a major potential of blood-borne parameters of the adaptive immune system to serve as trait or state markers in PD.
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Affiliation(s)
- Walter Maetzler
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
- * E-mail:
| | - Anja Apel
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | | | - Christian Deuschle
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | - Sarah Selina Dilger
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | - Johannes Georg Stirnkorb
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | - Claudia Schulte
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | - Erwin Schleicher
- Department of Internal Medicine IV, University Hospital Tuebingen, Tuebingen, Germany
| | - Thomas Gasser
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
| | - Daniela Berg
- Center of Neurology, Department of Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany
- DZNE, German Center for Neurodegenerative Diseases, University of Tuebingen, Tuebingen, Germany
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Chiang HL, Ngo ST, Chen CJ, Hu CK, Li MS. Oligomerization of Peptides LVEALYL and RGFFYT and Their Binding Affinity to Insulin. PLoS One 2013; 8:e65358. [PMID: 23805182 PMCID: PMC3689759 DOI: 10.1371/journal.pone.0065358] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2012] [Accepted: 04/26/2013] [Indexed: 01/12/2023] Open
Abstract
Recently it has been proposed a model for fibrils of human insulin in which the fibril growth proceeds via stacking LVEALYL (fragment 11-17 from chain B of insulin) into pairs of tightly interdigitated [Formula: see text]-sheets. The experiments have also shown that LVEALYL has high propensity to self-assembly and binding to insulin. This necessitates study of oligomerization of LVEALYL and its binding affinity to full-length insulin. Using the all-atom simulations with Gromos96 43a1 force field and explicit water it is shown that LVEALYL can aggregate. Theoretical estimation of the binding free energy of LVEALYL to insulin by the molecular mechanic Poisson-Boltzmann surface area method reveals its strong binding affinity to chain B, implying that, in agreement with the experiments, LVEALYL can affect insulin aggregation via binding mechanism. We predict that, similar to LVEALYL, peptide RGFFYT (fragment B22-27) can self-assemble and bind to insulin modulating its fibril growth process. The binding affinity of RGFFYT is shown to be comparable with that of LVEALYL.
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Affiliation(s)
- Hsin-Lin Chiang
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
- Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan
| | - Son Tung Ngo
- Institute for Computational Science and Technology, 6 Quarter, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
- Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Chun-Jung Chen
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
- Life Science Group, Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
- Institute of Biotechnology, National Cheng Kung University, Tainan City, Taiwan
| | - Chin-Kun Hu
- Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan
- * E-mail: (CKH); (MSL)
| | - Mai Suan Li
- Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
- * E-mail: (CKH); (MSL)
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Ghasemi R, Dargahi L, Haeri A, Moosavi M, Mohamed Z, Ahmadiani A. Brain insulin dysregulation: implication for neurological and neuropsychiatric disorders. Mol Neurobiol 2013; 47:1045-65. [PMID: 23335160 DOI: 10.1007/s12035-013-8404-z] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Accepted: 01/03/2013] [Indexed: 12/18/2022]
Abstract
Arduous efforts have been made in the last three decades to elucidate the role of insulin in the brain. A growing number of evidences show that insulin is involved in several physiological function of the brain such as food intake and weight control, reproduction, learning and memory, neuromodulation and neuroprotection. In addition, it is now clear that insulin and insulin disturbances particularly diabetes mellitus may contribute or in some cases play the main role in development and progression of neurodegenerative and neuropsychiatric disorders. Focusing on the molecular mechanisms, this review summarizes the recent findings on the involvement of insulin dysfunction in neurological disorders like Alzheimer's disease, Parkinson's disease and Huntington's disease and also mental disorders like depression and psychosis sharing features of neuroinflammation and neurodegeneration.
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Affiliation(s)
- Rasoul Ghasemi
- Neuroscience Research Center and Department of Physiology, Shiraz University of Medical Sciences, Shiraz, Iran
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24
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L Ng K, Nguyễn L. Role of vitamin d in Parkinson's disease. ISRN NEUROLOGY 2012; 2012:134289. [PMID: 22619734 PMCID: PMC3349248 DOI: 10.5402/2012/134289] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 11/29/2011] [Indexed: 01/29/2023]
Abstract
Parkinson's disease (PD) is the second most common form of neurodegeneration in the elderly population. Clinically, it is characterized by tremor, rigidity, slowness of movement, and postural imbalance. A significant association between low serum vitamin D and PD has been demonstrated, suggesting that elevated vitamin D levels might provide protection against PD. Genetic studies have helped identify a number of proteins linking vitamin D to PD pathology, including the major histocompatibility complex (MHC) class II, the vitamin D receptor (VDR), cytochrome P450 2D6 (CYP2D6), chromosome 22, the renin-angiotensin system (RAS), heme oxygenase-1 (HO-1), poly(ADP-ribose) polymerase-1 gene (PARP-1), neurotrophic factor (NTF), and Sp1 transcription factor. Vitamin D has also been implicated in PD through its effects on L-type voltage-sensitive calcium channels (L-VSCC), nerve growth factor (NGF), matrix metalloproteinases (MMPs), prostaglandins (PGs) and cyclooxygenase-2 (COX-2), reactive oxygen species (ROS), and nitric oxide synthase (NOS). A growing body of evidence suggests that vitamin D supplementation may be beneficial for PD patients. Among the different forms of vitamin D, calcitriol (1,25-dihydroxyvitamin D3) is best indicated for PD, because it is a highly active vitamin D3 metabolite with an appropriate receptor in the central nervous system (CNS).
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Affiliation(s)
- Khanh L Ng
- Vietnamese American Medical Research Foundation, Westminster, CA 92683, USA
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25
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Oberländer U, Pletinckx K, Döhler A, Müller N, Lutz MB, Arzberger T, Riederer P, Gerlach M, Koutsilieri E, Scheller C. Neuromelanin is an immune stimulator for dendritic cells in vitro. BMC Neurosci 2011; 12:116. [PMID: 22085464 PMCID: PMC3225309 DOI: 10.1186/1471-2202-12-116] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 11/15/2011] [Indexed: 12/25/2022] Open
Abstract
Background Parkinson's disease (PD) is characterized at the cellular level by a destruction of neuromelanin (NM)-containing dopaminergic cells and a profound reduction in striatal dopamine. It has been shown recently that anti-melanin antibodies are increased in sera of Parkinson patients, suggesting that NM may act as an autoantigen. In this study we tested whether NM is being recognized by dendritic cells (DCs), the major cell type for inducing T- and B-cell responses in vivo. This recognition of NM by DCs is a prerequisite to trigger an adaptive autoimmune response directed against NM-associated structures. Results Murine DCs were treated with NM of substantia nigra (SN) from human subjects or with synthetic dopamine melanin (DAM). DCs effectively phagocytized NM and subsequently developed a mature phenotype (CD86high/MHCIIhigh). NM-activated DCs secreted the proinflammatory cytokines IL-6 and TNF-α. In addition, they potently triggered T cell proliferation in a mixed lymphocyte reaction, showing that DC activation was functional to induce a primary T cell response. In contrast, DAM, which lacks the protein and lipid components of NM but mimics the dopamine-melanin backbone of NM, had only very little effect on DC phenotype and function. Conclusions NM is recognized by DCs in vitro and triggers their maturation. If operative in vivo, this would allow the DC-mediated transport and presentation of SN antigens to the adaptive immune system, leading to autoimmmunity in susceptible individuals. Our data provide a rationale for an autoimmune-based pathomechanism of PD with NM as the initial trigger.
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Affiliation(s)
- Uwe Oberländer
- University of Würzburg, Institute of Virology and Immunobiology, Würzburg, Germany
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26
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Oliveira LMA, Lages A, Gomes RA, Neves H, Família C, Coelho AV, Quintas A. Insulin glycation by methylglyoxal results in native-like aggregation and inhibition of fibril formation. BMC BIOCHEMISTRY 2011; 12:41. [PMID: 21819598 PMCID: PMC3175161 DOI: 10.1186/1471-2091-12-41] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 08/05/2011] [Indexed: 12/22/2022]
Abstract
Background Insulin is a hormone that regulates blood glucose homeostasis and is a central protein in a medical condition termed insulin injection amyloidosis. It is intimately associated with glycaemia and is vulnerable to glycation by glucose and other highly reactive carbonyls like methylglyoxal, especially in diabetic conditions. Protein glycation is involved in structure and stability changes that impair protein functionality, and is associated with several human diseases, such as diabetes and neurodegenerative diseases like Alzheimer's disease, Parkinson's disease and Familiar Amyloidotic Polyneuropathy. In the present work, methylglyoxal was investigated for their effects on the structure, stability and fibril formation of insulin. Results Methylglyoxal was found to induce the formation of insulin native-like aggregates and reduce protein fibrillation by blocking the formation of the seeding nuclei. Equilibrium-unfolding experiments using chaotropic agents showed that glycated insulin has a small conformational stability and a weaker dependence on denaturant concentration (smaller m-value). Our observations suggest that methylglyoxal modification of insulin leads to a less compact and less stable structure that may be associated to an increased protein dynamics. Conclusions We propose that higher dynamics in glycated insulin could prevent the formation of the rigid cross-β core structure found in amyloid fibrils, thereby contributing to the reduction in the ability to form fibrils and to the population of different aggregation pathways like the formation of native-like aggregates.
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Affiliation(s)
- Luis M A Oliveira
- Centro de Investigação Interdisciplinar Egas Moniz, Instituto Superior das Ciências da Saúde Egas Moniz, Campus Universitário, Monte da Caparica 2829-511 Caparica, Portugal
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27
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Berhanu WM, Masunov AE. Controlling the aggregation and rate of release in order to improve insulin formulation: molecular dynamics study of full-length insulin amyloid oligomer models. J Mol Model 2011; 18:1129-42. [PMID: 21674205 DOI: 10.1007/s00894-011-1123-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Accepted: 05/09/2011] [Indexed: 02/07/2023]
Abstract
Insulin is a hormone that regulates the physiological glucose level in human blood. Insulin injections are used to treat diabetic patients. The amyloid aggregation of insulin may cause problems during the production, storage, and delivery of insulin formulations. Several modifications to the C-terminus of the B chain have been suggested in order to improve the insulin formulation. The central fragments of the A and B chains (LYQLENY and LVEALYL) have recently been identified as β-sheet-forming regions, and their microcrystalline structures have been used to build a high-resolution amyloid fibril model of insulin. Here we report on a molecular dynamics (MD) study of single-layer oligomers of the full-length insulin which aimed to identify the structural elements that are important for amyloid stability, and to suggest single glycine mutants in the β-sheet region that may improve the formulation. Structural stability, aggregation behavior and the thermodynamics of association were studied for the wild-type and mutant aggregates. A comparison of the oligomers of different sizes revealed that adding strands enhances the internal stability of the wild-type aggregates. We call this "dynamic cooperativity". The secondary structure content and clustering analysis of the MD trajectories show that the largest aggregates retain the fibril conformation, while the monomers and dimers lose their conformations. The degree of structural similarity between the oligomers in the simulation and the fibril conformation is proposed as a possible explanation for the experimentally observed shortening of the nucleation lag phase of insulin with oligomer seeding. Decomposing the free energy into electrostatic, van der Waals and solvation components demonstrated that electrostatic interactions contribute unfavorably to the binding, while the van der Waals and especially solvation effects are favorable for it. A per-atom decomposition allowed us to identify the residues that contribute most to the binding free energy. Residues in the β-sheet regions of chains A and B were found to be the key residues as they provided the largest favorable contributions to single-layer association. The positive ∆∆G (mut) values of 37.3 to 1.4 kcal mol(-1) of the mutants in the β-sheet region indicate that they have a lower tendency to aggregate than the wild type. The information obtained by identifying the parts of insulin molecules that are crucial to aggregate formation and stability can be used to design new analogs that can better control the blood glucose level. The results of our simulation may help in the rational design of new insulin analogs with a decreased propensity for self-association, thus avoiding injection amyloidosis. They may also be used to design new fast-acting and delayed-release insulin formulations.
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Affiliation(s)
- Workalemahu Mikre Berhanu
- NanoScience Technology Center and Department of Chemistry, University of Central Florida, Orlando, FL 32826, USA
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28
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Birth asphyxia as the major complication in newborns: moving towards improved individual outcomes by prediction, targeted prevention and tailored medical care. EPMA J 2011. [PMID: 23199149 PMCID: PMC3405378 DOI: 10.1007/s13167-011-0087-9] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Perinatal Asphyxia—oxygen deficit at delivery—can lead to severe hypoxic ischaemic organ damage in newborns followed by a fatal outcome or severe life-long pathologies. The severe insults often cause neurodegenerative diseases, mental retardation and epilepsies. The mild insults lead to so-called “minimal brain-damage disorders” such as attention deficits and hyperactivity, but can also be associated with the development of schizophrenia and life-long functional psychotic syndromes. Asphyxia followed by re-oxygenation can potentially lead to development of several neurodegenerative pathologies, diabetes type 2 and cancer. The task of individual prediction, targeted prevention and personalised treatments before a manifestation of the life-long chronic pathologies usually developed by newborns with asphyxic deficits, should be given the extraordinary priority in neonatology and paediatrics. Socio-economical impacts of educational measures and advanced strategies in development of robust diagnostic approaches targeted at effected molecular pathways, biomarker-candidates and potential drug-targets for tailored treatments are reviewed in the paper.
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29
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α-synuclein reactive antibodies as diagnostic biomarkers in blood sera of Parkinson's disease patients. PLoS One 2011; 6:e18513. [PMID: 21541339 PMCID: PMC3081826 DOI: 10.1371/journal.pone.0018513] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Accepted: 03/07/2011] [Indexed: 11/22/2022] Open
Abstract
Background Auto-antibodies with specificity to self-antigens have been implicated in a wide variety of neurological diseases, including Parkinson's (PD) and Alzheimer's diseases, being sensitive indicators of neurodegeneration and focus for disease prevention. Of particular interest are the studies focused on the auto-immune responses to amyloidogenic proteins associated with diseases and their applications in therapeutic treatments such as vaccination with amyloid antigens and antibodies in PD, Alzheimer's disease and potentially other neurodegeneration ailments. Methodology/Principal Findings Generated auto-antibodies towards the major amyloidogenic protein involved in PD Lewy bodies – α-synuclein and its amyloid oligomers and fibrils were measured in the blood sera of early and late PD patients and controls by using ELISA, Western blot and Biacore surface plasmon resonance. We found significantly higher antibody levels towards monomeric α-synuclein in the blood sera of PD patients compared to controls, though the responses decreased with PD progression (P<0.0001). This indicates potential protective role of autoimmunity in maintaining the body homeostasis and clearing protein species whose disbalance may lead to amyloid assembly. There were no noticeable immune responses towards amyloid oligomers, but substantially increased levels of IgGs towards α-synuclein amyloid fibrils both in PD patients and controls, which subsided with the disease progression (P<0.0001). Pooled IgGs from PD patients and controls interacted also with the amyloid fibrils of Aβ (1–40) and hen lysozyme, however the latter were recognized with lower affinity. This suggests that IgGs bind to the generic amyloid conformational epitope, displaying higher specificity towards human amyloid species associated with neurodegeneration. Conclusions/Significance Our findings may suggest the protective role of autoimmunity in PD and therefore immune reactions towards PD major amyloid protein – α-synuclein can be of value in the development of treatment and diagnostic strategies, especially during the early disease stages.
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Can molecular dynamics simulations assist in design of specific inhibitors and imaging agents of amyloid aggregation? Structure, stability and free energy predictions for amyloid oligomers of VQIVYK, MVGGVV and LYQLEN. J Mol Model 2010; 17:2423-42. [PMID: 21174134 DOI: 10.1007/s00894-010-0912-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Accepted: 11/21/2010] [Indexed: 12/15/2022]
Abstract
The aggregation modes of hexapeptide fragments of Tau, Insulin and Aβ peptide (VQIVYK, MVGGVV and LYQLEN) were found from their microcrystalline structures that had been recently resolved by X-ray analysis. The atomic structures reveal a dry self-complementary interface between the neighboring β-sheet layers, termed "steric zipper". In this study we perform several all-atom molecular dynamics simulations with explicit water to analyze stability of the crystalline fragments of 2-10 hexapeptides each and their analogs with single glycine replacement mutations to investigate the structural stability, aggregation behavior and thermodynamic of the amyloid oligomers. Upon comparing single and double layer models, our results reveal that additional strands contribute significantly to the structural stability of the peptide oligomers for double layer model, while in the case of single layer model the stability decreases (or remains the same in the case of LYQLEN). This is in agreement with the previous studies performed on different types of amyloid models. We also replaced the side-chains participating in the steric zipper interfaces with glycine. None of the mutants were structurally stable compared to the respective wild type model, except for mutants V2G and V6G in MVGGVV2 case. The exception can be explained by structural features of this particular polymorph. The double layer decamer and dodecamer aggregates of the wild type hexapeptides appear to be stable at 300K, which is confirmed by the conservation of high anti-parallel β-sheet content throughout the whole simulation time. Deletions of the side chains resulted in decline of secondary structure content compared to corresponding wild type indicating that the role of the replaced amino acid in stabilizing the structure. Detailed analysis of the binding energy reveals that stability of these peptide aggregates is determined mainly by the van der Waals and hydrophobic forces that can serve as quantitative measure of shape complementarities between the side chains. This observation implies that interactions among side chains forming the dehydrated steric zipper, rather than among those exposed to water, are the major structural determinant. The electrostatic repulsion destabilizes the studied double layer aggregates in two cases, while stabilizes the other two. Negative total binding free energy indicates that both wild type and mutants complex formation is favorable. However, the mutants complexation is less favorable than the wild type's. The present study provides the atomic level understanding of the aggregation behavior and the driving force for the amyloid aggregates, and could be useful for rational design of amyloid inhibitors and amyloid-specific biomarkers for diagnostic purposes.
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Abstract
In the rare medical condition termed injection amyloidosis, extracellular fibrils of insulin are observed. We found that the segment of the insulin B-chain with sequence LVEALYL is the smallest segment that both nucleates and inhibits the fibrillation of full-length insulin in a molar ratio-dependent manner, suggesting that this segment is central to the cross-beta spine of the insulin fibril. In isolation from the rest of the protein, LVEALYL forms microcrystalline aggregates with fibrillar morphology, the structure of which we determined to 1 A resolution. The LVEALYL segments are stacked into pairs of tightly interdigitated beta-sheets, each pair displaying the dry steric zipper interface typical of amyloid-like fibrils. This structure leads to a model for fibrils of human insulin consistent with electron microscopic, x-ray fiber diffraction, and biochemical studies.
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32
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Morris JK, Zhang H, Gupte AA, Bomhoff GL, Stanford JA, Geiger PC. Measures of striatal insulin resistance in a 6-hydroxydopamine model of Parkinson's disease. Brain Res 2008; 1240:185-95. [PMID: 18805403 DOI: 10.1016/j.brainres.2008.08.089] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 08/26/2008] [Accepted: 08/28/2008] [Indexed: 01/26/2023]
Abstract
Clinical evidence has shown a correlation between Parkinson's disease (PD) and Type 2 Diabetes (T2D), as abnormal glucose tolerance has been reported in >50% of PD patients. The development of insulin resistance and the degeneration of nigrostriatal dopamine (DA) neurons are both mediated by oxidative mechanisms, and oxidative stress is likely a mechanistic link between these pathologies. Although glucose uptake in neuronal tissues is primarily non-insulin dependent, proteins involved in insulin signaling, such as insulin receptor substrate 2 (IRS2) and glucose transporter 4 (GLUT4), are present in the basal ganglia. The purpose of this study was to determine whether nigrostriatal DA depletion affects measures of insulin resistance in the striatum. Six weeks after 6-hydroxydopamine (6-OHDA) infusion into the medial forebrain bundle, rats were classified as having either partial (20-65%) or severe (90-99%) striatal DA depletion. Increased IRS2 serine phosphorylation, a marker of insulin resistance, was observed in the DA-depleted striatum. Additionally, severe depletion resulted in decreased total IRS2, indicating possible degradation of the protein. Decreased phosphorylation of AKT and expression of the kinase glycogen synthase kinase-3 alpha (GSK3-alpha) was also measured in the striatum of severely DA-depleted animals. Finally, expression of heat shock protein 25 (Hsp25), which is protective against oxidative damage and can decrease stress kinase activity, was decreased in the striatum of lesioned rats. Together, these results support the hypothesis that nigrostriatal DA depletion impairs insulin signaling in the basal ganglia.
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Affiliation(s)
- J K Morris
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
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