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Hazra R, Bera N, Layek S, Sarkar N. Efficiency of Encapsulation of Thioflavin T (ThT) into Polar and Nonpolar Environments of Different Bile Salt Aggregates: A Femtosecond Fluorescence Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39042864 DOI: 10.1021/acs.langmuir.4c01460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
The binding of Thioflavin T (ThT) with various bile salts, a potential host molecule, has been analyzed by steady-state and time-resolved fluorescence spectroscopy. A comparative study has been executed to investigate the influence of confinement of different bile salts, namely, sodium cholate (NaCh), sodium taurocholate (NaTC), and sodium deoxycholate (NaDC) on binding and excited state torsional motion of ThT molecules. The changes in absorption and emission properties of probe molecules were found to be sensitive to increasing bile salt concentration in aqueous 0.2 (M) NaCl solutions. The photophysics of ThT mainly depends on hydrophobicity, morphology, and size of bile salt aggregates in solution. In the presence of bile salts, the emission intensity and emission lifetime of ThT increase significantly, indicating encapsulation of dye. Moreover, we have also investigated the effect of the ionic strength of the medium by sodium chloride (NaCl) on the spectroscopic properties of ThT in the restricted surroundings of aqueous bile salts. It is observed that the fluorescence lifetime of ThT in bile salts increases significantly in the presence of NaCl. The encapsulation efficiency of ThT in bile salt aggregates has been assessed by iodide (I-) as an external ionic quencher. We found that NaDC aggregates are more efficient in the modulation of photophysical properties of ThT and also provide better protection efficiency to decrease the nonradiative deactivation processes.
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Affiliation(s)
- Ritwik Hazra
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nanigopal Bera
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Souvik Layek
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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2
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Temprano A, Sanchez de Blas B, Pérez-Melero C, Espinosa-Escudero R, Briz O, Cinca-Fernando P, Llera L, Monte MJ, Bermejo-Gonzalez FA, Marin JJ, Romero MR. Synthesis, Characterization, and Potential Usefulness in Liver Function Assessment of Novel Bile Acid Derivatives with Near-Infrared Fluorescence (NIRBAD). Bioconjug Chem 2024; 35:971-980. [PMID: 38958375 PMCID: PMC11261600 DOI: 10.1021/acs.bioconjchem.4c00168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 06/21/2024] [Accepted: 06/25/2024] [Indexed: 07/04/2024]
Abstract
Conventional serum markers often fail to accurately detect cholestasis accompanying many liver diseases. Although elevation in serum bile acid (BA) levels sensitively reflects impaired hepatobiliary function, other factors altering BA pool size and enterohepatic circulation can affect these levels. To develop fluorescent probes for extracorporeal noninvasive hepatobiliary function assessment by real-time monitoring methods, 1,3-dipolar cycloaddition reactions were used to conjugate near-infrared (NIR) fluorochromes with azide-functionalized BA derivatives (BAD). The resulting compounds (NIRBADs) were chromatographically (FC and PTLC) purified (>95%) and characterized by fluorimetry, 1H NMR, and HRMS using ESI ionization coupled to quadrupole TOF mass analysis. Transport studies using CHO cells stably expressing the BA carrier NTCP were performed by flow cytometry. Extracorporeal fluorescence was detected in anesthetized rats by high-resolution imaging analysis. Three NIRBADs were synthesized by conjugating alkynocyanine 718 with cholic acid (CA) at the COOH group via an ester (NIRBAD-1) or amide (NIRBAD-3) spacer, or at the 3α-position by a triazole link (NIRBAD-2). NIRBADs were efficiently taken up by cells expressing NTCP, which was inhibited by taurocholic acid (TCA). Following i.v. administration of NIRBAD-3 to rats, liver uptake and consequent release of NIR fluorescence could be extracorporeally monitored. This transient organ-specific handling contrasted with the absence of release to the intestine of alkynocyanine 718 and the lack of hepatotropism observed with other probes, such as indocyanine green. NIRBAD-3 administration did not alter serum biomarkers of hepatic and renal toxicity. NIRBADs can serve as probes to evaluate hepatobiliary function by noninvasive extracorporeal methods.
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Affiliation(s)
- Alvaro
G. Temprano
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
| | - Beatriz Sanchez de Blas
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
- Center
for the Study of Liver and Gastrointestinal Diseases (CIBEREHD), Carlos III National Institute of Health, Madrid 28029, Spain
| | - Concepción Pérez-Melero
- Pharmaceutical
Chemistry Laboratory, Pharmaceutical Sciences Department, University of Salamanca, IBSAL, Salamanca 37007, Spain
| | - Ricardo Espinosa-Escudero
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
| | - Oscar Briz
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
- Center
for the Study of Liver and Gastrointestinal Diseases (CIBEREHD), Carlos III National Institute of Health, Madrid 28029, Spain
| | - Paula Cinca-Fernando
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
| | - Lucia Llera
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
| | - Maria J. Monte
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
- Center
for the Study of Liver and Gastrointestinal Diseases (CIBEREHD), Carlos III National Institute of Health, Madrid 28029, Spain
| | | | - Jose J.G. Marin
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
- Center
for the Study of Liver and Gastrointestinal Diseases (CIBEREHD), Carlos III National Institute of Health, Madrid 28029, Spain
| | - Marta R. Romero
- Experimental
Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca 37007, Spain
- Center
for the Study of Liver and Gastrointestinal Diseases (CIBEREHD), Carlos III National Institute of Health, Madrid 28029, Spain
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3
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Diao J, Yu X, Ma L, Li Y, Sun Y. Protein Surface Structural Recognition in Inactive Areas: A New Immobilization Strategy for Acetylcholinesterase. Bioconjug Chem 2018; 29:1703-1713. [DOI: 10.1021/acs.bioconjchem.8b00160] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianxiong Diao
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Xiaolu Yu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Lin Ma
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Yuanqing Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Ying Sun
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
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4
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Hu MX, Li X, Li JN, Huang JJ, Ren GR. Multilayer affinity adsorption of albumin on polymer brushes modified membranes in a continuous-flow system. J Chromatogr A 2018; 1538:94-103. [DOI: 10.1016/j.chroma.2018.01.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 01/12/2018] [Accepted: 01/15/2018] [Indexed: 12/11/2022]
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5
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Paul BK, Sett R, Guchhait N. Stepwise unfolding of Ribonuclease A by a biosurfactant. J Colloid Interface Sci 2017; 505:673-681. [DOI: 10.1016/j.jcis.2017.06.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 06/16/2017] [Accepted: 06/16/2017] [Indexed: 11/29/2022]
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6
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Nishijima M, Pace TC, Bohne C, Mori T, Inoue Y, Wada T. Highly enantiodifferentiating site of human serum albumin for mediating photocyclodimerization of 2-anthracenecarboxylate elucidated by site-specific inhibition/quenching with xenon. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.12.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Thakur R, Das A, Adhikari C, Chakraborty A. Partitioning of prototropic species of an anticancer drug ellipticine in bile salt aggregates of different head groups and hydrophobic skeletons: a photophysical study to probe bile salts as multisite drug carriers. Phys Chem Chem Phys 2015; 16:15681-91. [PMID: 24960221 DOI: 10.1039/c4cp01308e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The entrapment of neutral and cationic species of an anticancer drug, namely ellipticine and their dynamic features in different bile salt aggregates have been investigated for the first time using steady state and time-resolved fluorescence spectroscopy. Because ellipticine exists in various prototropic forms under physiological conditions, we performed comparative photophysical and dynamical studies on these prototropic species in different bile salts varying in their head groups and hydrophobic skeletons. We found that the initial interaction between ellipticine and bile salts is governed by the electrostatic forces where cationic ellipticine is anchored to the head groups of bile salts. Bile salts having conjugated head groups are better candidates to bind with the cationic species than those having the non-conjugated ones. The fact implies that binding of cationic species to different bile salts depends on the pK(a) of the corresponding bile acids. The hydrophobic interaction dominates at higher concentrations of bile salts due to formation of aggregates and results in entrapment of neutral ellipticine molecules according to their hydrophobicity indices. Thus bile salts act as multisite drug carriers. The rotational relaxation parameters of cationic ellipticine were found to be dependent on head groups and the number of hydroxyl groups on the hydrophilic surface of bile salts. Cationic ellipticine exhibits a faster rotational relaxation in the tri-hydroxy bile salt aggregates than in di-hydroxy bile salts. We interpreted this observation from the fact that tri-hydroxy bile salts hold a higher number of water molecules in their hydrophilic surface offering a less viscous environment for ellipticine compared to di-hydroxy bile salts. Surprisingly, the neutral ellipticine molecules display almost the same rotational relaxation in all the bile salts. The observation indicates that after intercalation inside the hydrophobic pocket, neutral ellipticine molecules experience similar confinement in all the bile salts.
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Affiliation(s)
- Raina Thakur
- Department of Chemistry, Indian Institute of Technology Indore, IET, M-Block, India.
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8
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Guo Z, Chen G, Zeng G, Li Z, Chen A, Wang J, Jiang L. Fluorescence chemosensors for hydrogen sulfide detection in biological systems. Analyst 2015; 140:1772-86. [PMID: 25529122 DOI: 10.1039/c4an01909a] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A comprehensive review of the development of H2S fluorescence-sensing strategies, including sensors based on chemical reactions and fluorescence resonance energy transfer (FRET), is presented. The advantages and disadvantages of fluorescence-sensing strategies are compared with those of traditional methods. Fluorescence chemosensors, especially those used in FRET sensing, are highly promising because of their low cost, technical simplicity, and their use in real-time sulfide imaging in living cells. Potential applications based on sulfate reduction to H2S, the relationship between sulfate-reducing bacteria activity and H2S yield, and real-time detection of sulfate-reducing bacteria activity using fluorescence sensors are described. The current challenges, such as low sensitivity and poor stability, are discussed.
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Affiliation(s)
- Zhi Guo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.
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9
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Albumin dialysis in artificial liver support systems: open-loop or closed-loop dialysis mode? ASAIO J 2015; 61:324-31. [PMID: 25650810 DOI: 10.1097/mat.0000000000000198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
In artificial liver support systems, the open-loop albumin dialysis mode (OLM) is usually used to remove protein-bound toxins from the blood of patients with liver failure. However, there is still interest in the closed-loop albumin dialysis mode (CLM) because this mode may enable not only the regeneration and reuse of albumin but also the miniaturization of artificial liver systems. In this article, we compared the two modes under a fixed amount of albumin in dialysate experimentally and theoretically. The results show that according to the detoxification efficiency in the 3 hour dialysis for removing albumin-bound bilirubin, CLM is better than OLM. The usage efficiency of albumin in CLM is also higher. Moreover, the advantage of CLM is more significant when the concentration of bilirubin in blood is lower. Under a given amount of albumin in dialysate, if the concentration of bilirubin in blood is high, one may further increase the performance of CLM by means of increasing the flow rate of the albumin dialysate or using the highly concentrated albumin dialysate.
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Tripathi AK, Mohapatra M, Mishra AK. Fluorescence of N-acylated dansylamide with a long hydrophobic tail: sensitive response to premicellar aggregation of sodium deoxycholate. Phys Chem Chem Phys 2015; 17:29985-94. [DOI: 10.1039/c5cp04263a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The present work describes the synthesis and photophysical studies of two fluorescent dansylamide derivatives, in which the amine group is acylated by a long hydrophobic chain (a part of a biologically relevant palmitic acid) and by a short hydrophobic tail (a part of acetic acid).
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Affiliation(s)
- Alok Kumar Tripathi
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Monalisa Mohapatra
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Ashok Kumar Mishra
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
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11
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Peng W, Ding F, Jiang YT, Peng YK. Bioavailability and activity of natural food additive triterpenoids as influenced by protein. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:2271-83. [PMID: 24548018 DOI: 10.1021/jf4049512] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Triterpenoids were thought to be biologically ineffective for a very long time, but aggregating proof on their widely ranging pharmacological activities paired with a dubious toxicity portrait has motivated regenerated attraction for human health and disease. In the current contribution, our central goal was to integratively dissect the biointeraction of two typical triterpenoids, ursolic acid and oleanolic acid, by the most fundamental macromolecule bovine serum albumin (BSA) by employing molecular modeling, steady state and time-resolved fluorescence, and circular dichroism spectra at the molecular scale. Based on molecular modeling, subdomain IIA, which matches Sudlow's site I, was allocated to retain high affinity for triterpenoids, but the affinity of ursolic acid with subdomain IIA is somewhat inferior compared to that of oleanolic acid, probably because the affinity differentiation arises from the different positions of the methyl group on the E-ring in the two triterpenoids. This sustains the site-specific ligands, and hydrophobic 8-anilino-1-naphthalenesulfonic acid probe results in arranging the triterpenoids at the warfarin-azapropazone site. The data of steady state and time-resolved fluorescence indicated that the recognition of triterpenoids by BSA produced quenching by a static type, in other words, the ground state BSA-triterpenoid complex formation with the affinities of 1.507/1.734, 1.042/1.186, and 0.8395/0.9863 × 10(4) M(-1) at 298, 304, and 310 K for ursolic acid/oleanolic acid, respectively. Thermodynamic analyses show that the basic forces acting between BSA and triterpenoids are hydrogen bonds, van der Waals forces, and hydrophobic interactions; this occurrence provoked the alterations of the BSA spatial structure with a noticeable decline of α-helix evoking perturbation of the protein, as stemmed from circular dichroism, synchronous fluorescence, and three-dimensional fluorescence measurements. We anticipate that the complexation of plant triterpenoids with protein delineated here may be exploited as a biologically relevant model for evaluating the physiologically applicable noncovalent complexes in in vivo examination of triterpenoid properties such as accumulation, bioavailability, and distribution.
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Affiliation(s)
- Wei Peng
- College of Food Science & Engineering, Northwest A&F University , Yangling 712100, China
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12
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Peng W, Ding F, Jiang YT, Sun Y, Peng YK. Evaluation of the biointeraction of colorant flavazin with human serum albumin: insights from multiple spectroscopic studies, in silico docking and molecular dynamics simulation. Food Funct 2014; 5:1203-17. [DOI: 10.1039/c3fo60712g] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The biological activities of azo colorant may significantly be influenced by the biointeraction of ligand to protein in the human body.
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Affiliation(s)
- Wei Peng
- College of Food Science & Engineering
- Northwest A&F University
- Yangling 712100, China
- Department of Chemistry
- China Agricultural University
| | - Fei Ding
- Department of Chemistry
- China Agricultural University
- Beijing 100193, China
- Department of Biological Engineering
- Massachusetts Institute of Technology
| | - Yu-Ting Jiang
- Department of Chemistry
- University of Ottawa
- Ottawa, Canada
| | - Ying Sun
- College of Resources and Environmental Sciences
- China Agricultural University
- Beijing 100193, China
| | - Yu-Kui Peng
- College of Food Science & Engineering
- Northwest A&F University
- Yangling 712100, China
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13
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Vayá I, Lhiaubet-Vallet V, Jiménez MC, Miranda MA. Photoactive assemblies of organic compounds and biomolecules: drug–protein supramolecular systems. Chem Soc Rev 2014; 43:4102-22. [DOI: 10.1039/c3cs60413f] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modification of the drug excited state properties within proteins provides information on binding and may result in a different photoreactivity.
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Affiliation(s)
- Ignacio Vayá
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC
- Universitat Politècnica de València
- E-46071 Valencia, Spain
| | - Virginie Lhiaubet-Vallet
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC
- Universitat Politècnica de València
- E-46071 Valencia, Spain
| | - M. Consuelo Jiménez
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC
- Universitat Politècnica de València
- E-46071 Valencia, Spain
| | - Miguel A. Miranda
- Departamento de Química/Instituto de Tecnología Química UPV-CSIC
- Universitat Politècnica de València
- E-46071 Valencia, Spain
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14
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Mandal S, Ghosh S, Banik D, Banerjee C, Kuchlyan J, Sarkar N. An Investigation into the Effect of the Structure of Bile Salt Aggregates on the Binding Interactions and ESIHT Dynamics of Curcumin: A Photophysical Approach To Probe Bile Salt Aggregates as a Potential Drug Carrier. J Phys Chem B 2013; 117:13795-807. [PMID: 24102639 DOI: 10.1021/jp407824t] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sarthak Mandal
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Surajit Ghosh
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Chiranjib Banerjee
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Jagannath Kuchlyan
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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Banerji B, Pramanik SK, Pal U, Maiti NC. Potent anticancer activity of cystine-based dipeptides and their interaction with serum albumins. Chem Cent J 2013; 7:91. [PMID: 23705891 PMCID: PMC3680302 DOI: 10.1186/1752-153x-7-91] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2013] [Accepted: 05/15/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Cancer is a severe threat to the human society. In the scientific community worldwide cancer remains a big challenge as there are no remedies as of now. Cancer is quite complicated as it involves multiple signalling pathways and it may be caused by genetic disorders. Various natural products and synthetic molecules have been designed to prevent cell proliferation. Peptide-based anticancer drugs, however, are not explored properly. Though peptides have their inherent proteolytic instability, they could act as anticancer agents. RESULTS In this present communication a suitably protected cystine based dipeptide and its deprotected form have been synthesized. Potent anticancer activities were confirmed by MTT assay (a laboratory test and a standard colorimetric assay, which measures changes in colour, for measuring cellular proliferation and phase contrast images. The IC50 value, a measure of the effectiveness of a compound in inhibiting biological or biochemical function, of these compounds ranges in the sub-micromolar level. The binding interactions with serum albumins (HSA and BSA) were performed with all these molecules and all of them show very strong binding at sub-micromolar concentration. CONCLUSIONS This study suggested that the cystine-based dipeptides were potential anticancer agents. These peptides also showed very good binding with major carrier proteins of blood, the serum albumins. We are currently working on determining the detailed mechanism of anticancer activity of these molecules.
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Affiliation(s)
- Biswadip Banerji
- Department of Chemistry, CSIR-Indian Institute of Chemical Biology, 4, Raja S,C, Mullick Road, Kolkata 700032, India.
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16
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Mandal S, Ghosh S, Aggala HHK, Banerjee C, Rao VG, Sarkar N. Modulation of the photophysical properties of 2,2'-bipyridine-3,3'-diol inside bile salt aggregates: a fluorescence-based study for the molecular recognition of bile salts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:133-143. [PMID: 23215031 DOI: 10.1021/la304319r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
2,2'-Bipyridine-3,3'-diol (BP(OH)(2)) has been used as a sensitive excited-state intramolecular proton transfer fluorophore to assess different bile salt aggregates as one of the potential biologically relevant host systems useful for carrying many sparingly water-soluble drug molecules. The formation of inclusion complexes, complex-induced fluorescence behavior, and their binding ability have been investigated from the modulated photophysics of BP(OH)(2) by means of photophysical techniques. The constrained hydrophobic environment provided by the aggregates significantly reduces the water-assisted nonradiative decay channels and lengthens the fluorescence lifetime of the proton-transferred DK tautomer. Both the absorption and fluorescence properties of BP(OH)(2) are found to be sensitive to the change in the structure, size, and hydrophobicity of the aggregates. Fluorescence quenching experiments were performed to gain insight into the differential distribution of the probe molecules between bulk aqueous phase and nanocavities of various aggregates. The observation of longer fluorescence lifetime and rotational relaxation time in NaDC aggregates compared to that in NaCh and NaTC aggregates indicates that the binding structures of NaDC aggregates are more rigid due to its greater hydrophobicity and larger size and therefore provide better protection to the bound guest. It is noteworthy to mention that the hydrophobic microenvironments provided by bile salt aggregates are much stronger than that provided by micelles and cyclodextrins. The accessibility of water to the aggregate-bound guest can significantly be enhanced with the addition of organic cosolvents. However, the efficiency decreases in the order of dimethylformamide, acetonitrile, and methanol.
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Affiliation(s)
- Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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17
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Ding F, Zhang L, Diao JX, Li XN, Ma L, Sun Y. Human serum albumin stability and toxicity of anthraquinone dye alizarin complexone: an albumin-dye model. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 79:238-246. [PMID: 22296882 DOI: 10.1016/j.ecoenv.2012.01.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Revised: 01/05/2012] [Accepted: 01/08/2012] [Indexed: 05/31/2023]
Abstract
The complexation between the primary vector of ligands in blood plasma, human serum albumin (HSA) and a toxic anthraquinone dye alizarin complexone, was unmasked by means of circular dichroism (CD), molecular modeling, steady state and time-resolved fluorescence, and UV/vis absorption measurements. The structural investigation of the complexed HSA through far-UV CD, three-dimensional and synchronous fluorescence shown the polypeptide chain of HSA partially destabilizing with a reduction of α-helix upon conjugation. From molecular modeling and competitive ligand binding results, Sudlow's site I, which was the same as that of warfarin-azapropazone site, was appointed to retain high-affinity for alizarin complexone. Moreover, steady state fluorescence displayed that static type and Förster energy transfer is the operational mechanism for the vanish in the tryptophan (Trp)-214 fluorescence, this corroborates time-resolved fluorescence that HSA-alizarin complexone adduct formation has an affinity of 10(5) M(-1), and the driving forces were found to be chiefly π-π, hydrophobic, and hydrogen bonds, associated with an exothermic free energy change. These data should be utilized to illustrate the mechanism by which the toxicological action of anthraquinone dyes is mitigated by transporter HSA.
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Affiliation(s)
- Fei Ding
- Department of Chemistry, China Agricultural University, Beijing 100193, China; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Li Zhang
- Key Laboratory of Pesticide Chemistry and Application Technology, Ministry of Agriculture, Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Jian-Xiong Diao
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Xiu-Nan Li
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Lin Ma
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Ying Sun
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
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