1
|
Grandini GS, Ximenes VF, Morgon NH, de Souza AR. Induced Chirality in Sulfasalazine by Complexation With Albumins: Theoretical and Experimental Study. Chirality 2024; 36:e23696. [PMID: 38965734 DOI: 10.1002/chir.23696] [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: 01/29/2024] [Revised: 05/22/2024] [Accepted: 05/28/2024] [Indexed: 07/06/2024]
Abstract
Through molecular recognition, drugs can interact and complex with macromolecules circulating in the body. The serum albumin transport protein, found in several mammals, has several interaction sites where these molecules can be located. The drug sulfasalazine (SSZ) is known in the literature to complex at drug site 1 (DS1) in human serum (HSA) and bovine serum (BSA) proteins. This complexation can be studied using various spectroscopic techniques. With the techniques used in this work, absorption in the ultraviolet and visible regions (UV-Vis) and electronic circular dichroism (ECD), a significant difference was observed in the results involving HSA and BSA. The application of theoretical methodologies, such as TD-DFT and molecular docking, suggests that the conformation that SSZ assumes in DS1 of the two proteins is different, which exposes it to different amino acid residues and different hydrophobicities. This difference in conformation may be related to the location of DS1 where the drug interacts or to the possibility of SSZ moving in the BSA site, due to its larger size, and moving less freely in HSA.
Collapse
Affiliation(s)
- Giulia Saneti Grandini
- Department of Chemistry, Faculty of Science, São Paulo State University, Bauru, São Paulo, Brazil
| | - Valdecir Farias Ximenes
- Department of Chemistry, Faculty of Science, São Paulo State University, Bauru, São Paulo, Brazil
| | - Nelson Henrique Morgon
- Institute of Chemistry, Department of Physical - Chemistry, University of Campinas, Campinas, São Paulo, Brazil
| | | |
Collapse
|
2
|
Kotynia A, Krzyżak E, Żądło J, Witczak M, Szczukowski Ł, Mucha J, Świątek P, Marciniak A. Anti-Inflammatory and Antioxidant Pyrrolo[3,4- d]pyridazinone Derivatives Interact with DNA and Bind to Plasma Proteins-Spectroscopic and In Silico Studies. Int J Mol Sci 2024; 25:1784. [PMID: 38339061 PMCID: PMC10855066 DOI: 10.3390/ijms25031784] [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: 01/16/2024] [Revised: 01/26/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024] Open
Abstract
From the point of view of the search for new pharmaceuticals, pyridazinone derivatives are a very promising group of compounds. In our previous works, we have proved that newly synthesized ligands from this group have desirable biological and pharmacokinetic properties. Therefore, we decided to continue the research evaluating the activity of pyrrolo[3,4-dpyridazinone derivatives. In this work, we focused on the interactions of five pyridazinone derivatives with the following biomolecules: DNA and two plasma proteins: orosomucoid and gamma globulin. Using several of spectroscopic methods, such as UV-Vis, CD, and fluorescence spectroscopy, we proved that the tested compounds form stable complexes with all biomacromolecules selected for analysis. These findings were also confirmed by the results obtained by molecular modeling. All tested pyridazinone derivatives bind to the ctDNA molecule via groove binding mechanisms. All these molecules can also be bound and transported by the tested plasma proteins; however, the stability of the complexes formed is lower than those formed with serum albumin.
Collapse
Affiliation(s)
- Aleksandra Kotynia
- Department of Basic Chemical Sciences, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211a, 50-556 Wrocław, Poland;
| | - Edward Krzyżak
- Department of Basic Chemical Sciences, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211a, 50-556 Wrocław, Poland;
| | - Julia Żądło
- “Biomolecule” Student Science Club, Department of Basic Chemical Sciences, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211a, 50-556 Wrocław, Poland; (J.Ż.); (M.W.)
| | - Maja Witczak
- “Biomolecule” Student Science Club, Department of Basic Chemical Sciences, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211a, 50-556 Wrocław, Poland; (J.Ż.); (M.W.)
| | - Łukasz Szczukowski
- Department of Medicinal Chemistry, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211, 50-556 Wrocław, Poland; (Ł.S.); (P.Ś.)
| | - Jakub Mucha
- Faculty of Pharmacy, Wroclaw Medical University, Borowska 211, 50-556 Wrocław, Poland;
| | - Piotr Świątek
- Department of Medicinal Chemistry, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211, 50-556 Wrocław, Poland; (Ł.S.); (P.Ś.)
| | - Aleksandra Marciniak
- Department of Basic Chemical Sciences, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211a, 50-556 Wrocław, Poland;
| |
Collapse
|
3
|
Britton D, Legocki J, Aristizabal O, Mishkit O, Liu C, Jia S, Renfrew PD, Bonneau R, Wadghiri YZ, Montclare JK. Protein-Engineered Fibers For Drug Encapsulation Traceable via 19F Magnetic Resonance. ACS APPLIED NANO MATERIALS 2023; 6:21245-21257. [PMID: 38037605 PMCID: PMC10682962 DOI: 10.1021/acsanm.3c04357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/11/2023] [Accepted: 10/13/2023] [Indexed: 12/02/2023]
Abstract
Theranostic materials research is experiencing rapid growth driven by the interest in integrating both therapeutic and diagnostic modalities. These materials offer the unique capability to not only provide treatment but also track the progression of a disease. However, to create an ideal theranostic biomaterial without compromising drug encapsulation, diagnostic imaging must be optimized for improved sensitivity and spatial localization. Herein, we create a protein-engineered fluorinated coiled-coil fiber, Q2TFL, capable of improved sensitivity to 19F magnetic resonance spectroscopy (MRS) detection. Leveraging residue-specific noncanonical amino acid incorporation of trifluoroleucine (TFL) into the coiled-coil, Q2, which self-assembles into nanofibers, we generate Q2TFL. We demonstrate that fluorination results in a greater increase in thermostability and 19F magnetic resonance detection compared to the nonfluorinated parent, Q2. Q2TFL also exhibits linear ratiometric 19F MRS thermoresponsiveness, allowing it to act as a temperature probe. Furthermore, we explore the ability of Q2TFL to encapsulate the anti-inflammatory small molecule, curcumin (CCM), and its impact on the coiled-coil structure. Q2TFL also provides hyposignal contrast in 1H MRI, echogenic signal with high-frequency ultrasound and sensitive detection by 19F MRS in vivo illustrating fluorination of coiled-coils for supramolecular assembly and their use with 1H MRI, 19F MRS and high frequency ultrasound as multimodal theranostic agents.
Collapse
Affiliation(s)
- Dustin Britton
- Department
of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, United States
| | - Jakub Legocki
- Department
of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, United States
| | - Orlando Aristizabal
- Center
for Advanced Imaging Innovation and Research (CAI2R), New York University School of Medicine, New York, New York 10016, United States
- Bernard
and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York 10016, United States
| | - Orin Mishkit
- Center
for Advanced Imaging Innovation and Research (CAI2R), New York University School of Medicine, New York, New York 10016, United States
- Bernard
and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York 10016, United States
| | - Chengliang Liu
- Department
of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, United States
| | - Sihan Jia
- Department
of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, United States
| | - Paul Douglas Renfrew
- Center
for Computational Biology, Flatiron Institute,
Simons Foundation, New York, New York 10010, United States
| | - Richard Bonneau
- Center
for Computational Biology, Flatiron Institute,
Simons Foundation, New York, New York 10010, United States
- Center for
Genomics and Systems Biology, New York University, New York, New York 10003, United States
- Courant
Institute
of Mathematical Sciences, Computer Science Department, New York University, New York, New York 10009, United States
| | - Youssef Z. Wadghiri
- Center
for Advanced Imaging Innovation and Research (CAI2R), New York University School of Medicine, New York, New York 10016, United States
- Bernard
and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York 10016, United States
| | - Jin Kim Montclare
- Department
of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York 11201, United States
- Bernard
and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York 10016, United States
- Department
of Chemistry, New York University, New York, New York 10012, United States
- Department
of Biomaterials, New York University College
of Dentistry, New York, New York 10010, United States
| |
Collapse
|
4
|
Kapoor L, Udhaya Kumar S, De S, Vijayakumar S, Kapoor N, Ashok Kumar SK, Priya Doss C G, Ramamoorthy S. Multispectroscopic, virtual and in vivo insights into the photoaging defense mediated by the natural food colorant bixin. Food Funct 2023; 14:319-334. [PMID: 36503930 DOI: 10.1039/d2fo02338e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An upsurge in early onset of photoaging due to repeated skin exposure to environmental stressors such as UV radiation is a challenge for pharmaceutical and cosmeceutical divisions. Current reports indicate severe side effects because of chemical or synthetic inhibitors of matrix metalloproteases (MMPs) in anti-skin aging cosmeceuticals. We evaluated the adequacy of bixin, a well-known FDA certified food additive, as a scavenger of free radicals and its inhibitory mechanism of action on MMP1, collagenase, elastase, and hyaluronidase. The anti-skin aging potential of bixin was evaluated by several biotechnological tools in silico, in vitro and in vivo. Molecular docking and simulation dynamics studies gave a virtual insight into the robust binding interaction between bixin and skin aging-related enzymes. Absorbance and fluorescence studies, enzyme inhibition assays, enzyme kinetics and in vitro bioassays of human dermal fibroblast (HDF) cells highlighted bixin's role as a potent antioxidant and inhibitor of skin aging-related enzymes. Furthermore, in vivo protocols were carried out to study the impact of bixin administration on UVA induced photoaging in C57BL/6 mice skin. Here, we uncover the UVA shielding effect of bixin and its efficacy as a novel anti-photoaging agent. Furthermore, the findings of this study provide a strong foundation to explore the pharmaceutical applications of bixin in several other biochemical pathways linked to MMP1, collagenase, elastase, and hyaluronidase.
Collapse
Affiliation(s)
- Leepica Kapoor
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| | - S Udhaya Kumar
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| | - Sourav De
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi, 62102, Taiwan
| | - Sujithra Vijayakumar
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| | - Nitin Kapoor
- Department of Endocrinology, Diabetes and Metabolism, Christian Medical College, Vellore 632004, Tamil Nadu, India.,Non Communicable Disease Unit and Implementation Science Lab, The Baker Heart and Diabetes Institute, Melbourne, VIC, 3004, Australia
| | - S K Ashok Kumar
- School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - George Priya Doss C
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| | - Siva Ramamoorthy
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
| |
Collapse
|
5
|
Britton D, Monkovic J, Jia S, Liu C, Mahmoudinobar F, Meleties M, Renfrew PD, Bonneau R, Montclare JK. Supramolecular Assembly and Small-Molecule Binding by Protein-Engineered Coiled-Coil Fibers. Biomacromolecules 2022; 23:4851-4859. [PMID: 36227640 DOI: 10.1021/acs.biomac.2c01031] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability to engineer a solvent-exposed surface of self-assembling coiled coils allows one to achieve a higher-order hierarchical assembly such as nano- or microfibers. Currently, these materials are being developed for a range of biomedical applications, including drug delivery systems; however, ways to mechanistically optimize the coiled-coil structure for drug binding are yet to be explored. Our laboratory has previously leveraged the functional properties of the naturally occurring cartilage oligomeric matrix protein coiled coil (C), not only for its favorable motif but also for the presence of a hydrophobic pore to allow for small-molecule binding. This includes the development of Q, a rationally designed pentameric coiled coil derived from C. Here, we present a small library of protein microfibers derived from the parent sequences of C and Q bearing various electrostatic potentials with the aim to investigate the influence of higher-order assembly and encapsulation of candidate small molecule, curcumin. The supramolecular fiber size appears to be well-controlled by sequence-imbued electrostatic surface potential, and protein stability upon curcumin binding is well correlated to relative structure loss, which can be predicted by in silico docking.
Collapse
Affiliation(s)
- Dustin Britton
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States
| | - Julia Monkovic
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States
| | - Sihan Jia
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States
| | - Chengliang Liu
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States
| | - Farbod Mahmoudinobar
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States.,Center for Computational Biology, Flatiron Institute, New York, New York10010, United States
| | - Michael Meleties
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States
| | - P Douglas Renfrew
- Center for Computational Biology, Flatiron Institute, New York, New York10010, United States
| | - Richard Bonneau
- Center for Computational Biology, Flatiron Institute, New York, New York10010, United States
| | - Jin Kim Montclare
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, Brooklyn, New York11201, United States.,Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York10016, United States.,Department of Chemistry, New York University, New York, New York10012, United States.,Department of Biomaterials, New York University College of Dentistry, New York, New York10010, United States
| |
Collapse
|
6
|
Derman D, Şenel EC, Opar E, Ferhanoğlu O, Polat Ö. Optical characterization of olive and sun flower oils via mueller matrix polarimetry in combination with principal component analysis. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2021. [DOI: 10.1007/s11694-021-00812-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
7
|
Excitation energy transfer kinetics of trimeric, monomeric and subunit-depleted Photosystem I from Synechocystis PCC 6803. Biochem J 2021; 478:1333-1346. [PMID: 33687054 DOI: 10.1042/bcj20210021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/03/2021] [Accepted: 03/09/2021] [Indexed: 01/16/2023]
Abstract
Photosystem I is the most efficient photosynthetic enzyme with structure and composition highly conserved among all oxygenic phototrophs. Cyanobacterial Photosystem I is typically associated into trimers for reasons that are still debated. Almost universally, Photosystem I contains a number of long-wavelength-absorbing 'red' chlorophylls (Chls), that have a sizeable effect on the excitation energy transfer and trapping. Here we present spectroscopic comparison of trimeric Photosystem I from Synechocystis PCC 6803 with a monomeric complex from the ΔpsaL mutant and a 'minimal' monomeric complex ΔFIJL, containing only subunits A, B, C, D, E, K and M. The quantum yield of photochemistry at room temperature was the same in all complexes, demonstrating the functional robustness of this photosystem. The monomeric complexes had a reduced far-red absorption and emission equivalent to the loss of 1.5-2 red Chls emitting at 710-715 nm, whereas the longest-wavelength emission at 722 nm was not affected. The picosecond fluorescence kinetics at 77 K showed spectrally and kinetically distinct red Chls in all complexes and equilibration times of up to 50 ps. We found that the red Chls are not irreversible traps at 77 K but can still transfer excitations to the reaction centre, especially in the trimeric complexes. Structure-based Förster energy transfer calculations support the assignment of the lowest-energy state to the Chl pair B37/B38 and the trimer-specific red Chl emission to Chls A32/B7 located at the monomer-monomer interface. These intermediate-energy red Chls facilitate energy migration from the lowest-energy states to the reaction centre.
Collapse
|
8
|
Yu Y, Wu DM, Li J, Deng SH, Liu T, Zhang T, He M, Zhao YY, Xu Y. Bixin Attenuates Experimental Autoimmune Encephalomyelitis by Suppressing TXNIP/NLRP3 Inflammasome Activity and Activating NRF2 Signaling. Front Immunol 2020; 11:593368. [PMID: 33362775 PMCID: PMC7756000 DOI: 10.3389/fimmu.2020.593368] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/10/2020] [Indexed: 12/13/2022] Open
Abstract
Multiple sclerosis (MS), an autoimmune and degenerative disease, is characterized by demyelination and chronic neuroinflammation. Bixin is a carotenoid isolated from the seeds of Bixa orellana that exhibits various potent pharmacological activities, including antioxidant, anti-inflammatory, and anti-tumor properties. However, the effects of bixin on MS have not yet been examined. To evaluate the effects and underlying molecular mechanisms of bixin on MS, experimental autoimmune encephalomyelitis (EAE) was established in C57BL/6 mice, which were treated via intragastric administration of bixin solutions. To evaluate the molecular mechanisms of bixin, quantitative reverse-transcription PCR, western blot, immunohistochemistry, flow cytometry, and enzyme-linked immunosorbent assay analyses were performed. We found that bixin significantly improved the symptoms and pathology in EAE mice, reduced the release of inflammatory cytokines TNF-α, IL-6, IL-8, IL-17, and IFN-γ, and increased the expression of the anti-inflammatory cytokine IL-10. And bixin reduced the proportion of Th1 and Th17 cells in the spleen and CNS, and suppressed microglia aggregation, and TXNIP/NLRP3 inflammasome activity by scavenging excessive reactive oxygen species (ROS) in EAE mice. Furthermore, bixin inhibited inflammation and oxidative stress via activating nuclear factor erythroid 2-related factor 2 (NRF2), and its downstream genes in EAE mice, meanwhile, these effects were suppressed upon treatment with an NRF2 inhibitor, ML385. Bixin prevented neuroinflammation and demyelination in EAE mice primarily by scavenging ROS through activation of the NRF2 signaling pathway. Taken together, our results indicate that bixin is a promising therapeutic candidate for treatment of MS.
Collapse
MESH Headings
- Animals
- Carotenoids/chemistry
- Carotenoids/pharmacology
- Carrier Proteins/metabolism
- Cytokines/metabolism
- Demyelinating Diseases/drug therapy
- Demyelinating Diseases/etiology
- Demyelinating Diseases/metabolism
- Demyelinating Diseases/pathology
- Disease Models, Animal
- Disease Susceptibility
- Encephalomyelitis, Autoimmune, Experimental/drug therapy
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Encephalomyelitis, Autoimmune, Experimental/metabolism
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Female
- Inflammasomes/metabolism
- Lymphocyte Count
- Mice
- NF-E2-Related Factor 2/metabolism
- NLR Family, Pyrin Domain-Containing 3 Protein/metabolism
- Oxidative Stress/drug effects
- Reactive Oxygen Species/metabolism
- Signal Transduction/drug effects
- T-Lymphocyte Subsets/drug effects
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- Thioredoxins/metabolism
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | - Ying Xu
- Clinical Medical College, The First Affiliated Hospital, Collaborative Innovation Center of Sichuan for Elderly Care and Health of Chengdu Medical College, Chengdu, China
| |
Collapse
|
9
|
Interaction of antitubercular drug candidates with α 1-acid glycoprotein produced in pulmonary granulomas. Int J Biol Macromol 2019; 147:1318-1327. [PMID: 31759028 DOI: 10.1016/j.ijbiomac.2019.10.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/09/2019] [Accepted: 10/09/2019] [Indexed: 11/24/2022]
Abstract
The intracellular pathogen Mycobacterium tuberculosis can survive and replicate within host macrophages. Among various immunomodulatory substances, macrophages also produce α1-acid glycoprotein (AAG) which is secreted into the extracellular matrix of tuberculosis granulomas that represents a specific binding environment. Employing circular dichroism (CD) and UV/VIS absorption spectroscopic methods, we demonstrated and evaluated the AAG binding properties of novel antitubercular drug candidates developed against sensitive and multidrug-resistant strains of M. tuberculosis. As inferred from the CD spectroscopic data, these chemically diverse organic molecules are engulfed within the β-barrel of the protein either in a monomeric or dimeric form. Molecular docking simulations suggested the importance of H-bonds and ligand-aromatic residue π-π stacking interactions in stabilizing the drug molecules at the protein binding site. Based on the estimated Kd values (7-20 μM), AAG could be considered as the significant binding partner of the antitubercular agents studied herein. As such, it may affect the drug distribution and bioavailability not only in serum but also in macrophages and in the extracellular matrix of tuberculosis granulomas.
Collapse
|
10
|
Powers MJ, Hill GE, Weaver RJ. An experimental test of mate choice for red carotenoid coloration in the marine copepod
Tigriopus californicus. Ethology 2019. [DOI: 10.1111/eth.12976] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Geoffrey E. Hill
- Department of Biological Sciences Auburn University Auburn AL USA
| | - Ryan J. Weaver
- Department of Biological Sciences Auburn University Auburn AL USA
- Department of Integrative Biology University of Texas Austin TX USA
| |
Collapse
|
11
|
Ding F, Peng W. Probing the local conformational flexibility in receptor recognition: mechanistic insight from an atomic-scale investigation. RSC Adv 2019; 9:13968-13980. [PMID: 35519308 PMCID: PMC9064033 DOI: 10.1039/c9ra01906e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 04/28/2019] [Indexed: 12/13/2022] Open
Abstract
Inherent protein conformational flexibility is important for biomolecular recognition, but this critical property is often neglected in several studies. This event can lead to large deviations in the research results. In the current contribution, we disclose the effects of the local conformational flexibility on receptor recognition by using an atomic-scale computational method. The results indicated that both static and dynamic reaction modes have noticeable differences, and these originated from the structural features of the protein molecules. Dynamic interaction results displayed that the structural stability and conformational flexibility of the proteins had a significant influence on the recognition processes. This point related closely to the characteristics of the flexible loop regions where bixin located within the protein structures. The energy decomposition analyses and circular dichroism results validated the rationality of the recognition studies. More importantly, the conformational and energy changes of some residues around the bixin binding domain were found to be vital to biological reactions. These microscopic findings clarified the nature of the phenomenon that the local conformational flexibility could intervene in receptor recognition. Obviously, this report may provide biophysical evidence for the exploration of the structure–function relationships of the biological receptors in the human body. The local conformational flexibility and dynamics have significant impacts on the receptor recognition processes, and this phenomenon is related closely to the structural characteristics of the flexible loop domains in biomacromolecules.![]()
Collapse
Affiliation(s)
- Fei Ding
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
- China
- Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education
| | - Wei Peng
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- China
- Department of Chemistry
| |
Collapse
|
12
|
Anantharaman A, Hemachandran H, Priya RR, Sankari M, Gopalakrishnan M, Palanisami N, Siva R. Inhibitory effect of apocarotenoids on the activity of tyrosinase: Multi-spectroscopic and docking studies. J Biosci Bioeng 2016; 121:13-20. [DOI: 10.1016/j.jbiosc.2015.05.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 04/21/2015] [Accepted: 05/12/2015] [Indexed: 01/17/2023]
|
13
|
Tedesco D, Bertucci C. Induced circular dichroism as a tool to investigate the binding of drugs to carrier proteins: Classic approaches and new trends. J Pharm Biomed Anal 2015; 113:34-42. [PMID: 25769668 DOI: 10.1016/j.jpba.2015.02.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 02/12/2015] [Indexed: 10/24/2022]
Abstract
Induced circular dichroism (ICD) is a spectroscopic phenomenon that provides versatile and useful methods for characterizing the structural and dynamic properties of the binding of drugs to target proteins. The understanding of biorecognition processes at the molecular level is essential to discover and validate new pharmacological targets, and to design and develop new potent and selective drugs. The present article reviews the main applications of ICD to drug binding studies on serum carrier proteins, going from the classic approaches for the derivation of drug binding parameters and the identification of binding sites, to an overview of the emerging trends for the characterization of binding modes by means of quantum chemical (QC) techniques. The advantages and limits of the ICD methods for the determination of binding parameters are critically reviewed; the capability to investigate the binding interactions of drugs and metabolites to their target proteins is also underlined, as well as the possibility of characterizing the binding sites to obtain a complete picture of the binding mechanism and dynamics. The new applications of ICD methods to identify stereoselective binding modes of drug/protein complexes are then reviewed with relevant examples. The combined application of experimental ICD spectroscopy and QC calculations is shown to identify qualitatively the bound conformations of ligands to target proteins even in the absence of a detailed structure of the binding sites, either obtained from experimental X-ray crystallography and NMR measurements or from computational models of the complex.
Collapse
Affiliation(s)
- Daniele Tedesco
- Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy
| | - Carlo Bertucci
- Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy.
| |
Collapse
|
14
|
Calogero G, Bartolotta A, Di Marco G, Di Carlo A, Bonaccorso F. Vegetable-based dye-sensitized solar cells. Chem Soc Rev 2015; 44:3244-94. [DOI: 10.1039/c4cs00309h] [Citation(s) in RCA: 254] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this review we provide an overview of vegetable pigments in dye-sensitized solar cells, starting from main limitations of cell performance to cost analysis and scaling-up prospects.
Collapse
Affiliation(s)
| | | | - Gaetano Di Marco
- CNR-IPCF
- Istituto per i Processi Chimico-Fisici
- 98158 Messina
- Italy
| | - Aldo Di Carlo
- CHOSE – Centre for Hybrid and Organic Solar Energy – University of Rome “Tor Vergata”
- 00133 Roma
- Italy
| | | |
Collapse
|
15
|
Karnaukhova E, Rutardottir S, Rajabi M, Wester Rosenlöf L, Alayash AI, Åkerström B. Characterization of heme binding to recombinant α1-microglobulin. Front Physiol 2014; 5:465. [PMID: 25538624 PMCID: PMC4255499 DOI: 10.3389/fphys.2014.00465] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 11/13/2014] [Indexed: 11/13/2022] Open
Abstract
Background: Alpha-1-microglobulin (A1M), a small lipocalin protein found in plasma and tissues, has been identified as a heme1 and radical scavenger that may participate in the mitigation of toxicities caused by degradation of hemoglobin. The objective of this work was to investigate heme interactions with A1M in vitro using various analytical techniques and to optimize analytical methodology suitable for rapid evaluation of the ligand binding properties of recombinant A1M versions. Methods: To examine heme binding properties of A1M we utilized UV/Vis absorption spectroscopy, visible circular dichroism (CD), catalase-like activity, migration shift electrophoresis, and surface plasmon resonance (SPR), which was specifically developed for the assessment of His-tagged A1M. Results: The results of this study confirm that A1M is a heme binding protein that can accommodate heme at more than one binding site and/or in coordination with different amino acid residues depending upon heme concentration and ligand-to-protein molar ratio. UV/Vis titration of A1M with heme revealed an unusually large bathochromic shift, up to 38 nm, observed for heme binding to a primary binding site. UV/Vis spectroscopy, visible CD and catalase-like activity suggested that heme is accommodated inside His-tagged (tgA1M) and tagless A1M (ntA1M) in a rather similar fashion although the His-tag is very likely involved into coordination with iron of the heme molecule. SPR data indicated kinetic rate constants and equilibrium binding constants with KD values in a μM range. Conclusions: This study provided experimental evidence of the A1M heme binding properties by aid of different techniques and suggested an analytical methodology for a rapid evaluation of ligand-binding properties of recombinant A1M versions, also suitable for other His-tagged proteins.
Collapse
Affiliation(s)
- Elena Karnaukhova
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration Silver Spring, MD, USA
| | - Sigurbjörg Rutardottir
- Division of Infection Medicine, Department of Clinical Sciences in Lund, Lund University Lund, Sweden
| | - Mohsen Rajabi
- Division of Therapeutic Proteins, Office of Biotechnology Products, Office of Pharmaceutical Science, Center for Drug Evaluation and Research, Food and Drug Administration Silver Spring, MD, USA
| | - Lena Wester Rosenlöf
- Division of Infection Medicine, Department of Clinical Sciences in Lund, Lund University Lund, Sweden
| | - Abdu I Alayash
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration Silver Spring, MD, USA
| | - Bo Åkerström
- Division of Infection Medicine, Department of Clinical Sciences in Lund, Lund University Lund, Sweden
| |
Collapse
|
16
|
Tay-Agbozo SS, Krzyaniak MD, Bowman MK, Street S, Kispert LD. DFT and ENDOR Study of Bixin Radical Cations and Neutral Radicals on Silica–Alumina. J Phys Chem B 2014; 119:7170-9. [DOI: 10.1021/jp506806n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sefadzi S. Tay-Agbozo
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
| | - Matthew D. Krzyaniak
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
| | - Michael K. Bowman
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
| | - Shane Street
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
| | - Lowell D. Kispert
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
| |
Collapse
|
17
|
Zhang Y, Wright E, Zhong Q. Effects of pH on the molecular binding between β-lactoglobulin and bixin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:947-54. [PMID: 23297828 DOI: 10.1021/jf303844w] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Binding between β-lactoglobulin (β-Lg), the major whey protein, and bixin, the major carotenoid in annatto, was studied at pH 3.0-10.0. The Fourier transform infrared spectroscopy and UV-vis absorption spectroscopy results showed that the binding involved a complex formation. The tryptophan quenching fluorescence and analytical ultracentrifugation data showed that there were two specific binding sites and that the binding affinity increased significantly with an increase in pH. A higher efficiency of energy transfer from tryptophan fluorescence to bixin was observed at higher pH. Thermodynamic parameters and the number of specific binding sites obtained from isothermal titration calorimetry and analytical ultracentrifugation suggested that binding involved mostly hydrophobic interactions for the two specific binding sites. The impacts of pH on binding were correlated to the conformation of β-Lg, the hydrophobic pocket of which becomes more available at higher pH and ionic strength.
Collapse
Affiliation(s)
- Yue Zhang
- Department of Food Science and Technology, University of Tennessee, Knoxville, Tennessee 37996, United States
| | | | | |
Collapse
|
18
|
Matei I, Ionescu S, Hillebrand M. Kaempferol-human serum albumin interaction: characterization of the induced chirality upon binding by experimental circular dichroism and TDDFT calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 96:709-715. [PMID: 22885084 DOI: 10.1016/j.saa.2012.07.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 07/05/2012] [Accepted: 07/10/2012] [Indexed: 06/01/2023]
Abstract
The experimental induced circular dichroism (ICD) and absorption spectra of the achiral flavonoid kaempferol upon binding to human serum albumin (HSA) were correlated to electronic CD and UV-vis spectra theoretically predicted by time-dependent density functional theory (TDDFT). The neutral and four anionic species of kaempferol in various conformations were considered in the calculations. The appearance of the experimental ICD signal was rationalized in terms of kaempferol binding to HSA in a distorted, chiral, rigid conformation. The comparison between the experimental and simulated spectra allowed for the identification of the kaempferol species that binds to HSA, namely the anion generated by deprotonation of the hydroxyl group in position 7. This approach constitutes a convenient method for evidencing the binding species and for determining its conformation in the binding pocket of the protein. Its main advantage over the UV-vis absorption method lays in the fact that only the bound ligand species gives an ICD signal.
Collapse
Affiliation(s)
- Iulia Matei
- Department of Physical Chemistry, University of Bucharest, Bd. Regina Elisabeta 4-12, 030018 Bucharest, Romania
| | | | | |
Collapse
|
19
|
Zhang Y, Zhong Q. Binding between bixin and whey protein at pH 7.4 studied by spectroscopy and isothermal titration calorimetry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:1880-1886. [PMID: 22268806 DOI: 10.1021/jf2050262] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Bixin is the major coloring component of annatto used in manufacturing colored cheeses, but its presence in liquid whey causes undesirable quality of the recovered whey protein ingredients. The objective of this work was to study molecular binding between bixin and three major whey proteins (β-lactoglobulin, α-lactalbumin, and bovine serum albumin) at pH 7.4 using UV-vis absorption spectroscopy, fluorescence spectroscopy, isothermal titration calorimetry, and circular dichroism. These complementary techniques illustrated that the binding is a spontaneous complexation process mainly driven by hydrophobic interactions. The complexation is favored at a lower temperature and a higher ionic strength. At a lower temperature, the binding is entropy-driven, while it changes to an enthalpy-driven process at higher temperatures. The binding also increases the percentage of unordered secondary structures of proteins. Findings from this work can be used to develop whey protein recovery processes for minimizing residual annatto content in whey protein ingredients.
Collapse
Affiliation(s)
- Yue Zhang
- Department of Food Science and Technology, University of Tennessee, Knoxville, Tennessee 37996, USA
| | | |
Collapse
|
20
|
Lopes P, Kataky R. Chiral interactions of the drug propranolol and α1-acid-glycoprotein at a micro liquid-liquid interface. Anal Chem 2012; 84:2299-304. [PMID: 22250754 DOI: 10.1021/ac2029425] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The investigation of chiral interactions of drugs with plasma proteins is of fundamental importance for drug efficacy and toxicity studies. In this paper, we demonstrate a simple liquid-liquid interface procedure for investigating chiral interactions. Chiral discrimination of the enantiomers of a basic drug, propranolol, was achieved at a micro liquid-liquid interface, using α(1)-acid-glycoprotein (AGP) as a chiral acute phase plasma protein. When the protein is added to an aqueous phase containing the enantiomers of propranalol hydrochloride, the binding of (S)- and (R)-propranolol hydrochloride to the protein results in a decrease in the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) current responses corresponding to the decrease in transfer of propranolol at an aqueous-1,2-dichloroethane interface. This decrease is a consequence of the complexation of the drug and the protein. The complex drug-protein does not transfer across the interface nor changes the transfer potential of the uncomplexed form of propranolol enantiomers. The bound concentration of propranolol enantiomers in the presence of AGP was found to be greater for (S)-propranolol than (R)-propranolol for solutions containing constant concentrations of AGP (50 μM). Scatchard analysis yielded association constants of 2.7 and 1.3 × 10(5) M(-1) for (S)- and (R)-propranolol, respectively.
Collapse
Affiliation(s)
- Paula Lopes
- Durham University, Department of Chemistry, South Road, Durham, DH1 3LE, UK
| | | |
Collapse
|
21
|
Pham TTH, Lo YL. Extraction of effective parameters of anisotropic optical materials using a decoupled analytical method. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:025006. [PMID: 22463032 DOI: 10.1117/1.jbo.17.2.025006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A decoupled analytical technique based on the Mueller matrix method and the Stokes parameters is proposed for extracting effective parameters of anisotropic optical materials in linear birefringence (LB), linear dichroism (LD), circular birefrinegence (CB), and circular dichroism (CD) properties. This technique is essential in determining the optical properties of opto-electric or biomedical materials for the development of advanced inspection and/or diagnostic applications. The error and resolution analysis of the proposed approach is demonstrated by extracting the effective parameters given an assumption of errors ranging ± 0.005 in the values of the output Stokes parameters. The results confirm the ability of the proposed method to yield full-range measurements of all the optical parameters. The decoupled nature of the analytical model yields several important advantages, including an improved accuracy and the ability to extract the parameters of optical samples with only LB, CB, LD, or CD property without using compensation technique or pretreatment. Moreover, by decoupling the extraction process, the "multiple solutions" problem inherent in previous models presented by the current group is avoided.
Collapse
Affiliation(s)
- Thi-Thu-Hien Pham
- National Cheng Kung University, Department of Mechanical Engineering, Tainan 701, Taiwan
| | | |
Collapse
|
22
|
Xiao Q, Zhou B, Huang S, Tian F, Guan H, Ge Y, Liu X, He Z, Liu Y. Direct observation of the binding process between protein and quantum dots by in situ surface plasmon resonance measurements. NANOTECHNOLOGY 2009; 20:325101. [PMID: 19620762 DOI: 10.1088/0957-4484/20/32/325101] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A layer-by-layer surface decoration technique has been developed to anchor quantum dots (QDs) onto a gold substrate and an in situ surface plasmon resonance technique has been used to study interactions between the QDs and different proteins. Direct observation of the binding of the protein onto the QDs and the kinetics of the adsorption and dissociation of different proteins on the QDs has been achieved. This would be helpful for the identification of particle-associated proteins and may offer a fundamental prerequisite for nanobiology, nanomedicine and nanotoxicology. The combination of the novel layer-by-layer surface modification method and in situ surface plasmon resonance would be powerful in studying biological systems such as DNA and cells.
Collapse
Affiliation(s)
- Qi Xiao
- State Key Laboratory of Virology, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, People's Republic of China
| | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Zsila F, Iwao Y. The drug binding site of human α1-acid glycoprotein: Insight from induced circular dichroism and electronic absorption spectra. Biochim Biophys Acta Gen Subj 2007; 1770:797-809. [PMID: 17321687 DOI: 10.1016/j.bbagen.2007.01.009] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2006] [Revised: 01/16/2007] [Accepted: 01/23/2007] [Indexed: 11/29/2022]
Abstract
Human alpha(1)-acid glycoprotein (AGP) is an important drug binding plasma protein which affects pharmacokinetical properties of various therapeutic agents. For the first time, interpretation of the induced circular dichroism (ICD) spectra of drug-AGP complexes is presented yielding valuable information on the protein binding environment. ICD spectra were obtained by novel ligands of which AGP induced optical activity have never been reported (primaquine, mefloquine, propranolol, terazosin, carbamazepine, rhodamine B) and by re-investigation of ICD spectra of protein-bound drugs published earlier (chlorpromazine, dipyridamole, prazosin). Spectroscopic features of the ICD and absorption bands of drugs combined with native AGP indicated chiral non-degenerate exciton coupling between the guest chromophore and the indole ring of an adjacent tryptophan (Trp) residue. Results of additional CD experiments performed by using recombinant AGP mutants showed no changes in the ligand binding ability of W122A in sharp contrast with the W25A which was unable to induce extrinsic CD signal with either ligand. Thus, these findings unequivocally prove that, likely via pi-pi stacking mechanism, Trp25 is essentially involved in the AGP binding of drugs studied here as well as of related compounds. Survey of the AGP binding data published in the literature support this conclusion. Our results provide a fast and efficient spectroscopic tool to determine the inclusion of ligand molecules into the beta-barrel cavity of AGP where the conserved Trp25 is located and might be useful in ligand-binding studies of other lipocalin proteins.
Collapse
Affiliation(s)
- Ferenc Zsila
- Department of Molecular Pharmacology, Institute of Biomolecular Chemistry, Chemical Research Center, Budapest, P.O. Box 17, H-1525, Hungary.
| | | |
Collapse
|
24
|
Lockwood SF, Gross GJ. Disodium disuccinate astaxanthin (Cardax): antioxidant and antiinflammatory cardioprotection. ACTA ACUST UNITED AC 2006; 23:199-216. [PMID: 16252014 DOI: 10.1111/j.1527-3466.2005.tb00166.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Disodium disuccinate astaxanthin (Cardax), DDA) has cardioprotective effects in the rat, rabbit, and canine models of experimental infarction. It is highly effective by parenteral administration in subchronic and acute dosing regimens. Unpublished data in rats suggest that oral cardioprotection is also readily achievable. DDA-induced myocardial salvage in the canine can reach 100% with a 4-day subchronic dosing regimen. At a single i.v. dose DDA is cardioprotective, when given 2 h before experimental coronary occlusion, but the protection is on the average two-thirds of that achieved with the subchronic regimen in dogs. In conscious animals DDA has no effects on hemodynamic parameters. The primary mechanism of cardioprotection appears to be antioxidant activity involving direct scavenging of superoxide anion, the lynchpin radical in ischemia-reperfusion injury. In addition, modulation of serum complement activity, as well as the reduction in the levels of C-reactive protein (CRP) and the membrane attack complex (MAC) in infarcted tissue suggest a significant antiinflammatory component in the mechanism of cardioprotective action of DDA. Stoichiometric binding of the meso-form of the compound to human serum albumin (HSA) has been demonstrated in vitro. This binding capacity overcomes the supramolecular assembly of the compound in aqueous solution, which by itself improves the stability and shelf life of aqueous formulations. Non-esterified astaxanthin readily enters cardiac tissue after either oral or parenteral administration, providing a reservoir of a cardioprotective agent with a significant half-life due to favorable ADME in mammals. Due to the well-documented safety profile of non-esterified astaxanthin in humans, disodium disuccinate astaxanthin may well find clinical utility in cardiovascular indications in humans following successful completion of preclinical and clinical pharmacology and toxicology studies.
Collapse
Affiliation(s)
- Samuel F Lockwood
- Hawaii Biotech, Inc., 99-193 Aiea Heights Drive, Suite 200, Aiea, HI 96701, USA.
| | | |
Collapse
|
25
|
Molnár P, Ősz E, Tóth G, Zsila F, Deli J. Preparation and Spectroscopic Characterization of (9Z,9′Z)-Lutein (Neolutein C). Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
26
|
Martini S, Bonechi C, Casolaro M, Corbini G, Rossi C. Drug–protein recognition processes investigated by NMR relaxation data. Biochem Pharmacol 2006; 71:858-64. [PMID: 16413504 DOI: 10.1016/j.bcp.2005.12.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2005] [Revised: 12/05/2005] [Accepted: 12/08/2005] [Indexed: 11/20/2022]
Abstract
In this paper we investigated the interaction processes occurring at the protein-solvent interface for prednisolone-albumin and prednisone-albumin systems, using an approach based on the analysis of proton selective relaxation rate enhancements of the ligand in the presence of the macromolecule. The contribution from the bound ligand fraction to the observed relaxation rate in relation to protein concentration allowed the calculation of the affinity index[A]L(T) and the normalized affinity index [AI(N)]L(T) which removes the effects of motional anisotropies and different proton densities, and isolates the contribution due to a decrease in the ligand dynamics caused by the binding with the protein. This approach allowed the comparison of the binding ability of prednisolone and prednisone towards albumin.
Collapse
Affiliation(s)
- Silvia Martini
- Department of Chemical and Biosystem Sciences, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy.
| | | | | | | | | |
Collapse
|
27
|
Lockwood SF, Penn MS, Hazen SL, Bikádi Z, Zsila F. The effects of oral Cardax (disodium disuccinate astaxanthin) on multiple independent oxidative stress markers in a mouse peritoneal inflammation model: influence on 5-lipoxygenase in vitro and in vivo. Life Sci 2006; 79:162-74. [PMID: 16466747 DOI: 10.1016/j.lfs.2005.12.052] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2005] [Revised: 12/15/2005] [Accepted: 12/19/2005] [Indexed: 11/22/2022]
Abstract
Disodium disuccinate astaxanthin ('rac'-dAST; Cardax) is a water-dispersible C40 carotenoid derivative under development for oral and parenteral administration for cardioprotection of the at-risk ischemic cardiovascular patient. In experimental infarction models in animals (rats, rabbits, and dogs), significant myocardial salvage has been obtained, up to 100% at the appropriate dose in dogs. The documented mechanism of action in vitro includes direct scavenging of biologically produced superoxide anion; in vivo in rabbits, modulation of the complement activity of serum has also been shown. A direct correlation between administration of the test compound in animals and reductions of multiple, independent markers of oxidative stress in serum was recently obtained in a rat experimental infarction model. For the current study, it was hypothesized that oral Cardax administration would inhibit oxidative damage of multiple relevant biological targets in a representative, well-characterized murine peritoneal inflammation model. A previously developed mass spectrometry-based (LC/ESI/MS/MS) approach was used to interrogate multiple distinct pathways of oxidation in a black mouse (C57/BL6) model system. In vivo markers of oxidant stress from peritoneal lavage samples (supernatants) were evaluated in mice on day eight (8) after treatment with either Cardax or vehicle (lipophilic emulsion without drug) orally by gavage at 500 mg/kg once per day for seven (7) days at five (5) time points: (1) baseline prior to treatment (t=0); (2) 16 h following intraperitoneal (i.p.) injection with thioglycollate to elicit a neutrophilic infiltrate; (3) 4 h following i.p. injection of yeast cell wall (zymosan; t=16 h/4 h thioglycollate+zymosan); (4) 72 h following i.p. injection with thioglycollate to elicit monocyte/macrophage infiltration; and (5) 72 h/4 h thioglycollate+zymosan. A statistically significant sparing effect on the arachidonic acid (AA) and linoleic acid (LA) substrates was observed at time points two and five. When normalized to the concentration of the oxidative substrates, statistically significant reductions of 8-isoprostane-F(2alpha) (8-iso-F(2alpha)) at time point three (maximal neutrophil recruitment/activation), and 5-HETE, 5-oxo-EET, 11-HETE, 9-HODE, and PGF(2alpha) at time point five (maximal monocyte/macrophage recruitment/activation) were observed. Subsequently, the direct interaction of the optically inactive stereoisomer of Cardax (meso-dAST) with human 5-lipoxygenase (5-LOX) was evaluated in vitro with circular dichroism (CD) and electronic absorption (UV/Vis) spectroscopy, and subsequent molecular docking calculations were made using mammalian 15-LOX as a surrogate (for which XRC data has been reported). The results suggested that the meso-compound was capable of interaction with, and binding to, the solvent-exposed surface of the enzyme. These preliminary studies provide the foundation for more detailed evaluation of the therapeutic effects of this compound on the 5-LOX enzyme, important in chronic diseases such as atherosclerosis, asthma, and prostate cancer in humans.
Collapse
Affiliation(s)
- Samuel F Lockwood
- Hawaii Biotech, Inc., 99-193 Aiea Heights Drive, Suite 200, Aiea, Hawaii 96701, USA.
| | | | | | | | | |
Collapse
|