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Carabadjac I, Vormittag LC, Muszer T, Wuth J, Ulbrich MH, Heerklotz H. Transfer of ANS-Like Drugs from Micellar Drug Delivery Systems to Albumin Is Highly Favorable and Protected from Competition with Surfactant by "Reserved" Binding Sites. Mol Pharm 2024; 21:2198-2211. [PMID: 38625037 DOI: 10.1021/acs.molpharmaceut.3c00875] [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: 04/17/2024]
Abstract
Micellar drug delivery systems (MDDS) for the intravenous administration of poorly soluble drugs have great advantages over alternative formulations in terms of the safety of their excipients, storage stability, and straightforward production. A classic example is mixed micelles of glycocholate (GC) and lecithin, both endogenous substances in human blood. What limits the use of MDDS is the complexity of the transitions after injection. In particular, as the MDDS disintegrate partially or completely after injection, the drug has to be transferred safely to endogenous carriers in the blood, such as human serum albumin (HSA). If this transfer is compromised, the drug might precipitate─a process that needs to be excluded under all circumstances. The key question of this paper is whether the high local concentration of GC at the moment and site of MDDS dissolution might transiently saturate HSA binding sites and, hence, endanger quick drug transfer. To address this question, we have used a new approach, which is time-resolved fluorescence spectroscopy of the single tryptophan in HSA, Trp-214, to characterize the competitive binding of GC and the drug substitute anilinonaphthalenesulfonate (ANS) to HSA. Time-resolved fluorescence of Trp-214 showed important advantages over established methods for tackling this problem. ANS has been the standard "model drug" to study albumin binding for decades, given its structural similarity to the class of naphthalene-containing acidic drugs and the fact that it is displaced from HSA by numerous drugs (which presumably bind to the same sites). Our complex global fit uses the critical approximation that the average lifetimes behave similarly to a single lifetime, but the resulting errors are found to be moderate and the results provide a convincing explanation of the, at first glance, counterintuitive behavior. Accordingly, and largely in line with the literature, we observed two types of sites binding ANS at HSA: 3 type A, rather peripheral, and 2 type B, likely more central sites. The latter quench Trp-214 by Förster Resonance Energy Transfer (FRET) with a rate constant of ≈0.4 ns-1 per ANS. Adding millimolar concentrations of GC displaces ANS from the A sites but not from B sites. At incomplete ANS saturation, this causes a GC-induced translocation of ANS from A to the more FRET-active B sites. This leads to the apparent paradox that the partial displacement of ANS from HSA increases its quenching effect on Trp-214. The most important conclusion is that (ANS-like) drugs cannot be displaced from the type-B sites, and consequently, drug transfer to these sites is not impaired by competitive binding of GC in the vicinity of a dissolving micelle. The second conclusion is that for unbound GC above the CMC (9 mM), ANS equilibrates between HSA and GC micelles but with a strong preference for free sites on HSA. That means that even persisting micelles would lose their cargo readily once exposed to HSA. For all MDDS sharing this property, targeted drug delivery approaches involving them as the nanocarrier would be pointless.
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Affiliation(s)
- Iulia Carabadjac
- Institute of Pharmaceutical Sciences, University of Freiburg, Hermann-Herder-Str. 9, 79104 Freiburg, Germany
| | - Leonie C Vormittag
- Institute of Pharmaceutical Sciences, University of Freiburg, Hermann-Herder-Str. 9, 79104 Freiburg, Germany
| | - Thomas Muszer
- Institute of Pharmaceutical Sciences, University of Freiburg, Hermann-Herder-Str. 9, 79104 Freiburg, Germany
| | - Jakob Wuth
- Institute of Pharmaceutical Sciences, University of Freiburg, Hermann-Herder-Str. 9, 79104 Freiburg, Germany
| | - Maximilian H Ulbrich
- Department of Neuroanatomy, Institute of Anatomy and Cell Biology, Faculty of Medicine, University of Freiburg, Albertstr. 17, 79104 Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, Schan̈zlestr. 18, Freiburg 79104, Germany
| | - Heiko Heerklotz
- Institute of Pharmaceutical Sciences, University of Freiburg, Hermann-Herder-Str. 9, 79104 Freiburg, Germany
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto M5s 3M2, Ontario, Canada
- BIOSS Centre for Biological Signalling Studies, Schan̈zlestr. 18, Freiburg 79104, Germany
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Mohanty S, Mishra SS, Kuldeep, Maharana J, Subuddhi U. Insight into the Effect of Submicellar Concentrations of Sodium Deoxycholate on the Structure, Stability, and Activity of Bovine and Human Serum Albumin: An Interesting Comparison between Single and Double Tryptophan Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5228-5244. [PMID: 38413419 DOI: 10.1021/acs.langmuir.3c03541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The progressive escalation in the applications of bile salts in diverse fields has triggered research on their interaction with various biological macromolecules, especially with proteins. A proper understanding of the interaction process of bile salts, particularly in the lower concentrations range, with the serum albumin seems important since the normal serum concentration of bile salts is approximately in the micromolar range. The current study deals with a comprehensive and comparative analysis of the interaction of submicellar concentrations of sodium deoxycholate (NaDC) with two homologous transport proteins: bovine serum albumin (BSA) and human serum albumin (HSA). HSA and BSA with one and two tryptophans, respectively, provide the opportunity for an interesting comparison of tryptophan fluorescence behavior on interaction with NaDC. The study suggests a sequential interaction of NaDC in three discrete stages with the two proteins. A detailed study using warfarin and ibuprofen as site markers provides information about the sites of interaction, which is further confirmed by inclusive molecular dynamics simulation analysis. Moreover, the comparison of the thermodynamics and stability of the NaDC-serum albumin complexes confirms the stronger interaction of NaDC with BSA as compared to that with HSA. The differential interaction between the bile salt and the two serum albumins is further established from the difference in the extent of decrease in the esterase-like activity assay of the proteins in the presence of NaDC. Therefore, the present study provides important insight into the effect of submicellar concentrations of NaDC on the structure, stability, and activity of the two homologous serum albumins and thus can contribute not only to the general understanding of the complex nature of serum albumin-bile salt interactions but also to the design of more effective pharmaceutical formulations in the field of drug delivery and biomedical research.
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Affiliation(s)
- Subhrajit Mohanty
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Smruti Snigdha Mishra
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Kuldeep
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Jitendra Maharana
- Distributed Information Centre, Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat 785013, Assam, India
| | - Usharani Subuddhi
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
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Hong X, Song X, Wu X, Yang C, Gong D, Zhang G. Treatments of heating and ultrasound improve the inhibition of gallocatechin gallate on tyrosinase. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:3896-3906. [PMID: 36321508 DOI: 10.1002/jsfa.12307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/26/2022] [Accepted: 11/02/2022] [Indexed: 05/03/2023]
Abstract
BACKGROUND Gallocatechin gallate (GCG), a catechin of tea polyphenols, possesses inhibitory ability against tyrosinase, but few studies have reported how common processing methods affect it. In this research, the influence of heating and ultrasound treatments on the inhibition of GCG against tyrosinase was explored by ultraviolet-visible absorption, fluorescence spectroscopy, high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry. RESULTS Both heating and ultrasound treatments of GCG alone improved GCG's inhibitory ability against tyrosinase compared with the untreated, and a combination of heating and ultrasound treatment (100 °C, 20 min + 630 W, 20 min) further decreased the relative tyrosinase activity to 26.8%. The treated GCG exhibited a stronger fluorescence quenching effect on tyrosinase, but did not have any influence on the static quenching mechanism. Compared to the untreated GCG, the binding constants of treated GCG by heating, ultrasound and their combination with tyrosinase significantly increased, but the number of binding sites was still approximately one and the main driving force of the treated GCG was still hydrophobic interaction. After treatments of heating, ultrasound and their combination, the composition of GCG solutions was changed. CONCLUSION The enhanced inhibition of treated GCG on tyrosinase may be due to partial conversion of GCG into epigallocatechin-3-gallate (EGCG) and gallic acid (GA), which may cooperate with GCG to better inhibit the enzyme activity. This study has provided some valuable information for the application of catechins against tyrosinase in food processing and cosmetic industry. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Xinyue Hong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Xin Song
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Xiaqing Wu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- Faculty of Life Science and Medicine, Northwest University, Xi'an, China
| | - Change Yang
- Faculty of Life Science and Medicine, Northwest University, Xi'an, China
| | - Deming Gong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
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Vormittag LC, Heerklotz H. Extending the Pseudo-Phase Model of Detergent-Lipid Dispersions by a Detergent-Binding Protein. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15592-15603. [PMID: 36480936 PMCID: PMC9774659 DOI: 10.1021/acs.langmuir.2c02234] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 10/12/2022] [Indexed: 06/17/2023]
Abstract
Mixed micellar drug delivery systems for poorly soluble active pharmaceutical ingredients (APIs) are easy to produce and long-term stable, because they represent equilibrium structures. However, their fate after intravenous injection is still largely unknown. Once injected into the bloodstream, they can potentially convert to vesicles or disappear altogether, with both API and excipients being picked up by blood components. Our study aimed at reducing the gap between the good, quantitative understanding of aqueous glycocholate (GC)-lecithin dispersions alone and the highly complex situation in the blood. To this end, we extended the pseudophase model previously established for lipid-detergent dispersions to include the detergent-binding protein albumin as another component. The model predicted a quaternary phase diagram with planar phase boundaries defined by key parameters of the ternary subsystems, which were then determined by isothermal titration calorimetry. They include the aqueous GC concentration upon bilayer-micelle coexistence, 5.2 mM, the GC-to-lipid mole ratios in coexisting bilayers (Resat = 0.2) and micelles (Resol = 0.7), as well as the capacity of the albumin to bind 0.1 GC molecules with a dissociation constant of KD = 0.1 mM and 6 GC molecules with KD = 0.7 mM. Subsequent measurements in the quaternary system showed phase boundaries in good agreement with the model predictions. In addition, the critical micelle concentration of GC shows a minimal value (midpoint of transition) of 9.1 mM at the temperature of 24 °C where the demicellization enthalpy is zero. The demicellization process is accompanied by a heat capacity change of 29 cal/mol K. The model improves the understanding of the mixed micellar drug delivery systems. The success of the approach encourages including even more blood components, like lipoproteins, to a quantitative treatment.
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Affiliation(s)
- Leonie C. Vormittag
- Institute
of Pharmaceutical Sciences, University of
Freiburg, Hermann-Herder-Str. 9, 79104Freiburg, Germany
| | - Heiko Heerklotz
- Institute
of Pharmaceutical Sciences, University of
Freiburg, Hermann-Herder-Str. 9, 79104Freiburg, Germany
- Center
for Biological Signaling Studies (BIOSS), University of Freiburg, Schänzlestr. 18, 79104Freiburg, Germany
- Leslie
Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, ONCanadaM5S 3M2
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5
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Progress in the application of sustained-release drug microspheres in tissue engineering. Mater Today Bio 2022; 16:100394. [PMID: 36042853 PMCID: PMC9420381 DOI: 10.1016/j.mtbio.2022.100394] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/05/2022] [Accepted: 08/06/2022] [Indexed: 01/22/2023]
Abstract
Sustained-release drug-loaded microspheres provide a long-acting sustained release, with targeted and other effects. There are many types of sustained-release drug microspheres and various preparation methods, and they are easy to operate. For these reasons, they have attracted widespread interest and are widely used in tissue engineering and other fields. In this paper, we provide a systematic review of the application of sustained-release drug microspheres in tissue engineering. First, we introduce this new type of drug delivery system (sustained-release drug carriers), describe the types of sustained-release drug microspheres, and summarize the characteristics of different microspheres. Second, we summarize the preparation methods of sustained-release drug microspheres and summarize the materials required for preparing microspheres. Third, various applications of sustained-release drug microspheres in tissue engineering are summarized. Finally, we summarize the shortcomings and discuss future prospects in the development of sustained-release drug microspheres. The purpose of this paper was to provide a further systematic understanding of the application of sustained-release drug microspheres in tissue engineering for the personnel engaged in related fields and to provide inspiration and new ideas for studies in related fields.
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6
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Aggarwal R, Hooda M, Kumar P, Jain N, Dubey GP, Chugh H, Chandra R. Visible-Light-Prompted Synthesis and Binding Studies of 5,6-Dihydroimidazo[2,1- b]thiazoles with BSA and DNA Using Biophysical and Computational Methods. J Org Chem 2022; 87:3952-3966. [PMID: 35235320 DOI: 10.1021/acs.joc.1c02471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Fused heterocyclic systems containing a bridgehead nitrogen atom have emerged as imperative pharmacophores in the design and development of new drugs. Among these heterocyclic moieties, the imidazothiazole scaffold has long been used in medicinal chemistry for the treatment of various diseases. In this study, we have established a simplistic and environmentally safe regioselective protocol for the synthesis of 5,6-dihydroimidazo[2,1-b]thiazole derivatives from easily available reactants. The reaction proceeds through in situ formation of the α-bromodiketones ensuing trap with imidazolidine-2-thione to provide these versatile bicyclic heterocycles in excellent yields. The synthesized compounds were screened through the molecular docking approach for the most stable complex formation with bovine serum albumin (BSA) and calf thymus deoxyribonucleic acid (ctDNA). The selected compound was further studied using ex vivo binding studies, which revealed moderate interactions with BSA and ctDNA. The binding studies were performed using biophysical approaches including UV-visible spectroscopy, steady-state fluorescence, circular dichroism (CD), and viscosity parameters.
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Affiliation(s)
- Ranjana Aggarwal
- Department of Chemistry, Kurukshetra University, Kurukshetra 136119, Haryana, India.,CSIR-National Institute of Science Communication and Policy Research, New Delhi 110012, India
| | - Mona Hooda
- Department of Chemistry, Kurukshetra University, Kurukshetra 136119, Haryana, India
| | - Prince Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra 136119, Haryana, India
| | - Naman Jain
- Department of Chemistry, Kurukshetra University, Kurukshetra 136119, Haryana, India
| | - Gyan Prakash Dubey
- Department of Chemistry, Kurukshetra University, Kurukshetra 136119, Haryana, India
| | - Heerak Chugh
- Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Ramesh Chandra
- Department of Chemistry, University of Delhi, New Delhi 110007, India
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7
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Li W, Wu Y, Li C, Zhu L. Effect of (E,E)‐2,4‐decadienal on Side‐Chain Modification, Conformation Change, and Aggregation of Bovine Serum Albumin. EUR J LIPID SCI TECH 2021. [DOI: 10.1002/ejlt.202100066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wenjuan Li
- College of Life Science Anqing Normal University Anqing Anhui 246133 P. R. China
- School of Food Engineering Anhui Science and Technology University Chuzhou Anhui 233100 P. R. China
- Key Laboratory of Biodiversity and Ecology Conservation of Southwest Anhui Anqing Anhui 246133 P. R. China
| | - Yan Wu
- College of Life Science Anqing Normal University Anqing Anhui 246133 P. R. China
- Key Laboratory of Biodiversity and Ecology Conservation of Southwest Anhui Anqing Anhui 246133 P. R. China
| | - Conghu Li
- College of Life Science Anqing Normal University Anqing Anhui 246133 P. R. China
- Key Laboratory of Biodiversity and Ecology Conservation of Southwest Anhui Anqing Anhui 246133 P. R. China
| | - Liangliang Zhu
- College of Life Science Anqing Normal University Anqing Anhui 246133 P. R. China
- Key Laboratory of Biodiversity and Ecology Conservation of Southwest Anhui Anqing Anhui 246133 P. R. China
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8
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Ren Y, Feng Y, Xu K, Yue S, Yang T, Nie K, Xu M, Xu H, Xiong X, Körte F, Barbeck M, Zhang P, Liu L. Enhanced Bioavailability of Dihydrotanshinone I-Bovine Serum Albumin Nanoparticles for Stroke Therapy. Front Pharmacol 2021; 12:721988. [PMID: 34531747 PMCID: PMC8438562 DOI: 10.3389/fphar.2021.721988] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 07/28/2021] [Indexed: 02/03/2023] Open
Abstract
Dihydrotanshinone I (DHT) is a natural component in Salvia miltiorrhiza and has been widely researched for its multiple bioactivities. However, poor solubility and biocompatibility of DHT limit its desirable application for clinical purposes. Herein, DHT was encapsulated with bovine serum albumin (BSA) to enhance bioavailability. Compared to free DHT, DHT-BSA NPs (nanoparticles) showed an improved solubility in normal saline and increased protection against hydrogen peroxide-induced oxidative damage in PC12 cells. In addition, DHT-BSA NPs administered by intravenous injection displayed a significant efficacy in the middle cerebral artery occlusion/reperfusion models, without any impact on the cerebral blood flow. In summary, DHT-BSA NPs show an enhanced bioavailability compared with free DHT and a successful penetration into the central nervous system for stroke therapy, demonstrating their application potential in cardio-cerebrovascular diseases.
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Affiliation(s)
- Yanru Ren
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Yicheng Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Kunyao Xu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Saisai Yue
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Tiantian Yang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Kaili Nie
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Man Xu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Haijun Xu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Xin Xiong
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
| | - Fabian Körte
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
| | - Mike Barbeck
- Institute of Material Science and Technology, Technical University of Berlin, Berlin, Germany
| | - Peisen Zhang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Luo Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
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Kadaf Manea Y, Banu A, Qashqoosh MT, Mumtaz Khan A, Alahdal FM, Ahmad Wani A, Salem MA, Naqvi S. Interaction of AMOT@CS NPs and AMOT drug with bovine serum albumin: Insights from spectroscopic and molecular docking techniques. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2021.111139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Difference in the binding mechanism of distinct antimony forms in bovine serum albumin. Biometals 2021; 34:493-510. [PMID: 33587218 DOI: 10.1007/s10534-021-00291-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Accepted: 02/02/2021] [Indexed: 10/22/2022]
Abstract
The toxicity of antimony (Sb) is closely related to its chemical forms. To further realize the toxicity risk of different forms of Sb, the separate and simultaneous binding mechanisms of antimony potassium tartrate/potassium pyroantimonate with bovine serum albumin (BSA) were investigated with muti-spectroscopic methods. Fluorescence quenching result and UV-vis absorption spectra showed that a 1:1 complex was formed between antimony potassium tartrate/potassium pyroantimonate and BSA through a modest binding force. The results revealed that the binding of antimony potassium tartrate/potassium pyroantimonate to BSA caused changes in the secondary structure of BSA. Both Sb forms (antimony potassium tartrate and potassium pyroantimonate) were able to interact with BSA when coexisting but there was a binding influence on their interacting with the BSA. Both Sb forms interfere with the binding of the other to protein.
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Li F, Tang Y. Inhibition mechanism: Phytic acid, NADH as a peroxidase inhibitor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 244:118856. [PMID: 32882659 DOI: 10.1016/j.saa.2020.118856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 08/12/2020] [Accepted: 08/15/2020] [Indexed: 06/11/2023]
Abstract
Peroxidase, a key enzyme causing enzymatic browning, and affected the potential values of fruit and vegetables. Phytic acid and NADH inhibited peroxidase in a competitive manner due to their reducing properties, and it's IC50 (1.18 ± 0.32) × 10-8, (8.02 ± 0.45) × 10-6 mol L-1, respectively. The interaction between phytic acid, NADH and peroxidase contributed to intrinsic fluorescence quenching and conformation alternation with a accuracy determination by multispectroscopic techniques (fluorescence spectra, FT-IR and CD spectra), respectively. Molecular docking simulation revealed that phytic acid, NADH interacted with His170, Ala34, Arg38, Ser73, Arg31, Lys174, Gln176, Asn175, Arg75; Gln176, Asn175, Phe221, Lys174, Gly173, Ser167, Phe172, Gly169, His170 in peroxidase, respectively and blocked substrates into catalytic reactions.
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Affiliation(s)
- Fengmao Li
- College of Life Science, Southwest University, Chongqing 400715, China; Chongqing Sweet Potato Engineering Research Center, Chongqing 400715, China
| | - Yunming Tang
- College of Life Science, Southwest University, Chongqing 400715, China; Chongqing Sweet Potato Engineering Research Center, Chongqing 400715, China.
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12
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Li F, Fu Y, Yang H, Tang Y. The inhibition mechanism of luteolin on peroxidase based on multispectroscopic techniques. Int J Biol Macromol 2021; 166:1072-1081. [PMID: 33157143 DOI: 10.1016/j.ijbiomac.2020.10.262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/30/2020] [Accepted: 10/31/2020] [Indexed: 01/11/2023]
Abstract
Luteolin, a plant-derived flavonoid, was found to exert effective inhibitory effect to peroxidase activity in a non-competitive manner with an IC50 of (6.62 ± 0.45) × 10-5 mol L-1. The interaction between luteolin and peroxidase induced the formation of a static complex with a binding constant (Ksv) of 7.31 × 103 L mol-1 s-1 driven by hydrogen bond and hydrophobic interaction. Further, the molecular interaction between luteolin and peroxidase resulted in intrinsic fluorescence quenching, structural and conformational alternations which were determined by multispectroscopic techniques combined with computational molecular docking. Molecular docking results revealed that luteolin bound to peroxidase and interacted with relevant amino acid residues in the hydrophobic pocket. These results will provide information for screening additional peroxidase inhibitors and provide evidence of luteolin's potential application in preservation and processing of fruit and vegetables and clinical disease remedy.
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Affiliation(s)
- Fengmao Li
- College of Life Science, Southwest University, Chongqing 400715, China; Engineering & Technology Research Center for Sweet potato of Chongqing, Chongqing 400715, China
| | - Yufan Fu
- College of Life Science, Southwest University, Chongqing 400715, China; Engineering & Technology Research Center for Sweet potato of Chongqing, Chongqing 400715, China
| | - Hao Yang
- College of Life Science, Southwest University, Chongqing 400715, China; Engineering & Technology Research Center for Sweet potato of Chongqing, Chongqing 400715, China
| | - Yunming Tang
- College of Life Science, Southwest University, Chongqing 400715, China; Engineering & Technology Research Center for Sweet potato of Chongqing, Chongqing 400715, China.
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13
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Structure analysis and inhibition mechanism of peroxidase in 'Zhongshu 1' sweet potato. Process Biochem 2021. [DOI: 10.1016/j.procbio.2020.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Lv X, Fu H, Xie J, Liu Z, Tuo X. Integrated multi-techniques to probe the binding mechanism between amlodipine and lactate dehydrogenase. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Li C, Du P, Zhou M, Yang L, Zhang H, Wang J, Yang C. Spectroscopic Methodology and Molecular Docking Studies on Changes in Binding Interaction of Felodipine with Bovine Serum Albumin Induced by Cocrystallization with β-Resorcylic Acid. Chem Pharm Bull (Tokyo) 2020; 68:946-953. [PMID: 32999146 DOI: 10.1248/cpb.c20-00212] [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] [Indexed: 11/22/2022]
Abstract
In the present study, a novel cocrystal of felodipine (FEL) and β-resorcylic acid (βRA) was developed. We specially focused on the change of binding pattern with bovine serum albumin (BSA) induced by cocrystallization of FEL with βRA. The solid characterizations and density functional theory (DFT) simulation verified that FEL-βRA cocrystal formed in equimolar ratio (1 : 1 M ratio) through C=O…H-O hydrogen bond between C=O group in FEL and O-H group in βRA. The binding interactions between FEL-βRA system and BSA were studied using fluorescence spectral and molecular docking methods. Two guest molecule systems, including a physical mixture of FEL and βRA and FEL-βRA cocrystal were performed binding to BSA in molecular docking. According to the Kb and binding energy, the supramolecular form of FEL-βRA system was retained during binding to BSA. Molecular docking simulation suggested that FEL and its cocrystal inserted into the subdomain IIIA (site II') of BSA. The interactions between FEL and BSA including hydrogen bonding with ASN390 residue and intermolecular hydrophobic interactions with LEU429 and LEU452 residues. However, the size of supramolecular FEL-βRA better matched that of active cavity of BSA; the cocrystal is closely bound to BSA through hydrogen bonding with ASN390 residue and intermolecular hydrophobic interactions with LEU429, VAL432, LEU452 and ILE387 residues. This change on binding affinity of FEL to BSA induced by cocrystallization with βRA provided theoretical basis to evaluate the transportation, distribution and metabolism of cocrystal drug.
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Affiliation(s)
- Congwei Li
- School of Pharmacy, Hebei Medical University
| | - Pengfei Du
- School of Pharmacy, Hebei Medical University
| | - Meilin Zhou
- School of Pharmacy, Hebei Medical University
| | - Liuxin Yang
- School of Pharmacy, Hebei Medical University
| | | | - Jing Wang
- School of Pharmacy, Hebei Medical University
| | - Caiqin Yang
- School of Pharmacy, Hebei Medical University
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Liu S, Wu X, Gu W, Yu J, Wu B. Influence of the digestive process on intestinal toxicity of polystyrene microplastics as determined by in vitro Caco-2 models. CHEMOSPHERE 2020; 256:127204. [PMID: 32470746 DOI: 10.1016/j.chemosphere.2020.127204] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 05/11/2020] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
The digestive tract is an important target organ for microplastics (MPs). However, little is known about the effects of digestive treatment on the intestinal toxicity of MPs. In this study, an in vitro digestive process was applied to transform 100 nm and 5 μm polystyrene microplastics (PS-MPs). Intestinal toxicities of original PS-MPs and transformed PS-MPs (t-PS-MPs) were determined using an in vitro Caco-2 monolayer model. Results showed that the digestive process did not alter the chemical constitution of PS-MPs, but formed a corona on the surface of PS-MPs. The 100 nm PS-MPs showed higher intestinal toxicity than 5 μm PS-MPs. Digestive treatment relieved cytotoxicity and transport function disorder of the Caco-2 monolayer induced by the original PS-MPs. Moreover, the combined toxicities of PS-MPs and arsenic were also decreased by digestive treatment. However, the in vitro digestive process increased the proinflammatory effects of PS-MPs. The formation of a corona on the PS-MP surface, which lead to a change in size, Zeta potential, and adsorbed compounds, might induce the above influence of digestive treatment. Our study suggests that direct cytotoxicity assays of PS-MPs might misestimate their intestinal effects, which provide new lights to the toxicity evaluation of PS-MPs by oral exposure.
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Affiliation(s)
- Su Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China; Department of Environmental Science, School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Xiaomei Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Weiqing Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Jing Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China.
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Liu Y, Huang L, Li D, Wang Y, Chen Z, Zou C, Liu W, Ma Y, Cao MJ, Liu GM. Re-assembled oleic acid-protein complexes as nano-vehicles for astaxanthin: Multispectral analysis and molecular docking. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.105689] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Song X, Hu X, Zhang Y, Pan J, Gong D, Zhang G. Inhibitory mechanism of epicatechin gallate on tyrosinase: inhibitory interaction, conformational change and computational simulation. Food Funct 2020; 11:4892-4902. [DOI: 10.1039/d0fo00003e] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Epicatechin gallate can inhibit the activity of tyrosinase in a mixed-type manner.
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Affiliation(s)
- Xin Song
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
| | - Xing Hu
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
| | - Ying Zhang
- Division of Accounting
- Nanchang University
- Nanchang 330047
- China
| | - Junhui Pan
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
| | - Deming Gong
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
- Department of Biomedicine
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
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