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Ahmed I, Das N, Islam AKMM, Plaisier JR, Parisse P, Bal JK. Interfacial Interactions of a Myoglobin/DOPC Hybrid System at the Air-Water Interface and Its Physicochemical Properties. ACS OMEGA 2023; 8:30199-30212. [PMID: 37636970 PMCID: PMC10448488 DOI: 10.1021/acsomega.3c02909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 07/31/2023] [Indexed: 08/29/2023]
Abstract
In the present study, the intermolecular interactions between a water-insoluble phospholipid (DOPC) and water-soluble protein (myoglobin) and the interaction among themselves were investigated at the air-water interface using the Langmuir and Langmuir-Blodgett techniques. The effects of changes in physicochemical factors, like pH and temperature, on these interactions were also examined. Surface pressure-molecular area (π-A) isotherms of the DOPC monolayer at the air-water interface, with and without myoglobin (Myo) revealed the evolution of various physical properties, such as elastic, thermodynamic, and hysteric properties, in response to changes in subphase pH and temperature. With the increment of subphase pH from 5 to 7 at a fixed temperature (20 °C), the DOPC isotherm expanded, and the in-plane elasticity (CS-1) decreased, but no significant presence of hysteresis was encountered in either of the pH values. On the other hand, a diminution of temperature (from 20 to 5 °C) leads to an expansion of monolayers yielding low elasticity and significant hysteresis. The incorporation of Myo molecules within the DOPC monolayer decreased the CS-1 value of the DOPC monolayer. Such a decrement in CS-1 was also encountered while increasing the pH and decreasing the temperature (T) of the subphase in the absence of Myo. Systematic expansion of DOPC isotherm and increased hysteric area with the increase in Myo proportion were observed and the atomic force microscopy (AFM) observations suggested a strong conjugation between Myo and DOPC in the mixed monolayer. The denaturation effect of Myo molecules was studied using AFM at different temperatures. Furthermore, the Myo molecules were found to be most surface active at pH = 7, which is very close to its isoelectric point. These observations come up with the interaction mechanism between biomolecules under dynamically varied conditions.
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Affiliation(s)
- Ikbal Ahmed
- Department
of Physics, Aliah University, Kolkata 700160, India
- International
Centre for Theoretical Sciences, Tata Institute
of Fundamental Research, Bengaluru 560089, India
| | - Nilanjan Das
- Abhedananda
Mahavidyalaya, University of Burdwan, Sainthia 731234, India
| | | | - Jasper Rikkert Plaisier
- Elettra-Sincrotrone
Trieste S.C.p.A., S.S.
14 Km 163,5 in Area Science Park, Basovizza, Trieste 34149, Italy
| | - Pietro Parisse
- Elettra-Sincrotrone
Trieste S.C.p.A., S.S.
14 Km 163,5 in Area Science Park, Basovizza, Trieste 34149, Italy
- Istituto
Officina dei Materiali—Consiglio Nazionale delle Ricerche, S.S. 14 Km 163,5 in Area Science
Park, Basovizza, Trieste 34149, Italy
| | - Jayanta Kumar Bal
- Abhedananda
Mahavidyalaya, University of Burdwan, Sainthia 731234, India
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Enders AA, Clark JB, Elliott SM, Allen HC. New Insights into Cation- and Temperature-Driven Protein Adsorption to the Air-Water Interface through Infrared Reflection Studies of Bovine Serum Albumin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5505-5513. [PMID: 37027519 DOI: 10.1021/acs.langmuir.3c00249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The chemistry and structure of the air-ocean interface modulate biogeochemical processes between the ocean and atmosphere and therefore impact sea spray aerosol properties, cloud and ice nucleation, and climate. Protein macromolecules are enriched in the sea surface microlayer and have complex adsorption properties due to the unique molecular balance of hydrophobicity and hydrophilicity. Additionally, interfacial adsorption properties of proteins are of interest as important inputs for ocean climate modeling. Bovine serum albumin is used here as a model protein to investigate the dynamic surface behavior of proteins under several variable conditions including solution ionic strength, temperature, and the presence of a stearic acid (C17COOH) monolayer at the air-water interface. Key vibrational modes of bovine serum albumin are examined via infrared reflectance-absorbance spectroscopy, a specular reflection method that ratios out the solution phase and highlights the aqueous surface to determine, at a molecular level, the surface structural changes and factors affecting adsorption to the solution surface. Amide band reflection absorption intensities reveal the extent of protein adsorption under each set of conditions. Studies reveal the nuanced behavior of protein adsorption impacted by ocean-relevant sodium concentrations. Moreover, protein adsorption is most strongly affected by the synergistic effects of divalent cations and increased temperature.
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Affiliation(s)
- Abigail A Enders
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jessica B Clark
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Scott M Elliott
- Computational Physics and Methods (CCS-2), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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3
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Yang Y, Li X, Song J, Li L, Ye Q, Zuo S, Liu T, Dong F, Liu X, He Z, Sun B, Sun J. Structure-Activity Relationship of pH-Sensitive Doxorubicin-Fatty Acid Prodrug Albumin Nanoparticles. NANO LETTERS 2023; 23:1530-1538. [PMID: 36719151 DOI: 10.1021/acs.nanolett.2c04976] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Albumin has emerged as a versatile drug carrier. To harness albumin as a carrier for doxorubicin (DOX), we synthesized three acid-labile DOX prodrugs using stearic acid (SA), oleic acid (OA), and linoleic acid (LA) as the albumin-binding motif, respectively. Different from conventional albumin nanodrugs (such as Abraxane, with a drug loading of 10%), the DOX prodrugs assembled albumin nanoparticles (NPs) have an ultrahigh drug loading (>35%). Noteworthy, we demonstrated that the saturation of fatty acids exerted great influence on colloidal stability of prodrug NPs, thus affecting their in vivo pharmacokinetics, tumor accumulation and antitumor efficacy. Furthermore, the hydrazone bond-bridged DOX prodrugs could remain intact in the bloodstream but allow DOX to be released in the acidic tumor environment, resulting in improved antitumor efficacy and safety. Our work gives novel insights into the structure-to-efficacy relationship of albumin-bound fatty acid prodrugs and provides a simple strategy for advanced albumin-bound nanomedicines.
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Affiliation(s)
- Yinxian Yang
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiuhong Li
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jiaxuan Song
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Lingxiao Li
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Qing Ye
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Shiyi Zuo
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Tian Liu
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Fudan Dong
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiaohong Liu
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Zhonggui He
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Bingjun Sun
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Jin Sun
- Department of Pharmaceutics, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
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Gupta R, Kumari J, Pati S, Singh S, Mishra M, Ghosh SK. Interaction of cyclotide Kalata B1 protein with model cellular membranes of varied electrostatics. Int J Biol Macromol 2021; 191:852-860. [PMID: 34592223 DOI: 10.1016/j.ijbiomac.2021.09.147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 11/27/2022]
Abstract
A uni-molecular layer of lipids at air-water interface mimicking one of the leaflets of the cellular membrane provides a simple model to understand the interaction of any foreign molecules with the membrane. Here, the interactions of protein Kalata B1 (KB1) of cyclotide family with the phospholipids 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), 1,2-dipalmitoyl-sn-glycero-3-phospho-rac-(1-glycerol) sodium salt (DPPG), and 1,2-distearoyl-sn-glycero-3-ethylphosphocholine chloride salt (DSEPC) have been investigated. The addition of KB1 induces a change in pressure of the lipid monolayers. The characteristic time of the change in pressure is found to be dependent on the electrostatic nature of the lipid. Even though the protein is weakly surface active, it is capable of modifying the phase behavior and elastic properties of lipid monolayers with differences in their strength and nature making the layers more floppy. The KB1-lipid interaction has been quantified by calculating the excess Gibb's free energy of interaction and the 1-anilino-8-naphthalenesulfonate (ANS) binding studies. The interaction with zwitterionic DPPC and negatively charged DPPG lipids are found to be thermodynamically favorable whereas the protein shows a weaker response to positively charged DSEPC lipid. Therefore, the long ranged electrostatic is the initial driving force for the KB1 to recognize and subsequently attach to a cellular membrane. Thereafter, the hydrophobic region of the protein may penetrate into the hydrophobic core of the membrane via specific amino acid residues.
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Affiliation(s)
- Ritika Gupta
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh 201314, India
| | - Jyoti Kumari
- Department of Life Sciences, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh 201314, India
| | - Soumya Pati
- Department of Life Sciences, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh 201314, India
| | - Shailja Singh
- Special Center for Molecular Medicine, Jawaharlal Nehru university, New Delhi 110067, India
| | - Manasi Mishra
- Department of Life Sciences, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh 201314, India.
| | - Sajal K Ghosh
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh 201314, India.
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Krajčíková K, Semančíková E, Zakutanská K, Kondrakhova D, Mašlanková J, Stupák M, Talian I, Tomašovičová N, Kimáková T, Komanický V, Dubayová K, Breznoščáková D, Pálová E, Semančík J, Tomečková V. Tear fluid biomarkers in major depressive disorder: Potential of spectral methods in biomarker discovery. J Psychiatr Res 2021; 138:75-82. [PMID: 33836432 DOI: 10.1016/j.jpsychires.2021.03.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 03/09/2021] [Accepted: 03/19/2021] [Indexed: 12/22/2022]
Abstract
Spectroscopic methods represent a group of analytical methods that demonstrate high potential in providing clinically relevant diagnostic information, such as biochemical, functional or structural changes of macromolecular complexes that might occur due to pathological processes or therapeutic intervention. Although application of these methods in the field of psychiatric research is still relatively recent, the preliminary results show that they have the capacity to detect subtle neurobiological abnormalities in major depressive disorder (MDD). Methods of mass spectrometry (MALDI-TOF MS), zymography, synchronous fluorescence spectroscopy (SFS), circular dichroism (CD) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) were used to analyze the human tear fluid of subjects with MDD. Using MALDI-TOF MS, two diagnostically significant peaks (3747 and 16 411 m/z) were identified with an AUC value of 0.89 and 0.92 in tear fluid of subjects with MDD vs controls, respectively. We also identified various forms of matrix metalloproteinase 9 in subjects with MDD using zymography and synchronous fluorescence spectra (SFS) showed a significant increase in fluorescence intensity at 280 nm. CD spectra were redshifted in tear fluid of subjects with MDD vs healthy controls. FTIR spectroscopy showed changes in the positions of peaks for amide A, I, II in tear fluid of subjects with MDD vs controls. Moreover, atomic force microscopy (AFM) showed different pattern in the crystal structures of tear fluid components in subjects with MDD. SFS, CD, FTIR spectroscopy, AFM and MALDI-TOF MS confirmed, that the human tear fluid proteome could be helpful in discriminating between the group of subjects with MDD and healthy controls. These preliminary findings suggest that spectral methods could represent a useful tool in clinical psychiatry, especially in establishing differential diagnosis, monitoring illness progression and the effect of psychiatric treatment.
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Affiliation(s)
- Kristína Krajčíková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Erika Semančíková
- 2(nd) Department of Psychiatry, L. Pasteur University Hospital, Rastislavova 43, Košice, 040 11, Slovakia; EPAMED s.r.o., Private Psychiatric Practice, Hlavná 68, Košice, 040 01, Slovakia.
| | - Katarína Zakutanská
- Institute of Experimental Physics, Department of Magnetism, Slovak Academy of Sciences, Watsonova 47, Košice, 040 01, Slovakia
| | - Daria Kondrakhova
- Institute of Physics, Department of Condensed Matter Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, Park Angelinum 9, Košice, 041 54, Slovakia
| | - Jana Mašlanková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Marek Stupák
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Ivan Talian
- Department of Medical and Clinical Biophysics, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Natália Tomašovičová
- Institute of Experimental Physics, Department of Magnetism, Slovak Academy of Sciences, Watsonova 47, Košice, 040 01, Slovakia
| | - Tatiana Kimáková
- Department of Public Health and Hygiene, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Šrobárová 2, 041 80, Košice, Slovakia
| | - Vladimír Komanický
- Institute of Physics, Department of Condensed Matter Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, Park Angelinum 9, Košice, 041 54, Slovakia
| | - Katarína Dubayová
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Dagmar Breznoščáková
- 1(st) Department of Psychiatry, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Eva Pálová
- EPAMED s.r.o., Private Psychiatric Practice, Hlavná 68, Košice, 040 01, Slovakia; 1(st) Department of Psychiatry, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Juraj Semančík
- 4(th) Clinic of Internal Medicine, L. Pasteur University Hospital, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Vladimíra Tomečková
- Department of Medical and Clinical Biochemistry, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
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Gong C, Qiao Z, Yuan Z, Huang S, Wang W, Wu PC, Chen Y. Topological Encoded Vector Beams for Monitoring Amyloid-Lipid Interactions in Microcavity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2100096. [PMID: 34194941 PMCID: PMC8224421 DOI: 10.1002/advs.202100096] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/25/2021] [Indexed: 05/05/2023]
Abstract
Lasers are the pillars of modern photonics and sensing. Recent advances in microlasers have demonstrated its extraordinary lasing characteristics suitable for biosensing. However, most lasers utilized lasing spectrum as a detection signal, which can hardly detect or characterize nanoscale structural changes in microcavity. Here the concept of amplified structured light-molecule interactions is introduced to monitor tiny bio-structural changes in a microcavity. Biomimetic liquid crystal droplets with self-assembled lipid monolayers are sandwiched in a Fabry-Pérot cavity, where subtle protein-lipid membrane interactions trigger the topological transformation of output vector beams. By exploiting Amyloid β (Aβ)-lipid membrane interactions as a proof-of-concept, it is demonstrated that vector laser beams can be viewed as a topology of complex laser modes and polarization states. The concept of topological-encoded laser barcodes is therefore developed to reveal dynamic changes of laser modes and Aβ-lipid interactions with different Aβ assembly structures. The findings demonstrate that the topology of vector beams represents significant features of intracavity nano-structural dynamics resulted from structured light-molecule interactions.
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Affiliation(s)
- Chaoyang Gong
- School of Electrical and Electronic EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore
| | - Zhen Qiao
- School of Electrical and Electronic EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore
| | - Zhiyi Yuan
- School of Electrical and Electronic EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore
| | - Shih‐Hsiu Huang
- Department of PhotonicsNational Cheng Kung UniversityTainan70101Taiwan
| | - Wenjie Wang
- Key Lab of Advanced Transducers and Intelligent Control System of Ministry of EducationTaiyuan University of TechnologyTaiyuan030024P. R. China
| | - Pin Chieh Wu
- Department of PhotonicsNational Cheng Kung UniversityTainan70101Taiwan
| | - Yu‐Cheng Chen
- School of Electrical and Electronic EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore
- School of Chemical and Biomedical EngineeringNanyang Technological University62 Nanyang DriveSingapore637459Singapore
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Sybachin AV, Stepanova DA. Modification of Multiliposomal Nanocontainers with Albumin as a Method for Increasing Their Resistance to Enzymatic Hydrolysis. COLLOID JOURNAL 2021. [DOI: 10.1134/s1061933x21020113] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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A Novel Experimental and Theoretical Method for Estimating Albumin-Mediated Hepatic Uptake Based on the Albumin Binding Fraction in Plasma and Human PK Prediction Using a Physiologically-Based Pharmacokinetic Approach. J Pharm Sci 2021; 110:2262-2273. [PMID: 33476657 DOI: 10.1016/j.xphs.2021.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 01/15/2023]
Abstract
Recently, protein-facilitated uptake has been suggested to be an important factor in the precise prediction of the pharmacokinetic (PK) profiles of drugs. In our previous study, a physiologically-based pharmacokinetic (PBPK) approach considering the mechanism of albumin-mediated hepatic uptake was developed for predicting human PK profiles. It was assumed that drugs affected by albumin-mediated hepatic uptake would bind only to albumin, which means that there would be over-estimation of the contribution of protein-facilitated uptake for a drug that could bind to multiple proteins. In this study, we developed a method that can evaluate the albumin binding fraction in plasma considering the affinity for other proteins. Based on the albumin binding fraction, the contribution of albumin-mediated hepatic uptake was theoretically estimated, and then the human PK profiles were predicted by our proposed PBPK approach incorporating this mechanism. As a result, the predicted human PK profiles agreed well with the observed ones, and the absolute average fold error of PK parameters was almost within a 1.5-fold error on average. These findings show the importance of considering protein-facilitated uptake and also suggest that our proposed PBPK approach can be useful in scientific discussions with regulatory authorities.
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Hupfer ML, Kaufmann M, Roussille L, Preiß J, Weiß D, Hinrichs K, Deckert V, Dietzek B, Beckert R, Presselt M. Arylic versus Alkylic-Hydrophobic Linkers Determine the Supramolecular Structure and Optoelectronic Properties of Tripodal Amphiphilic Push-Pull Thiazoles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2561-2570. [PMID: 30694677 DOI: 10.1021/acs.langmuir.8b03893] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The supramolecular structures and their constituents essentially determine the optoelectronic properties of thin films. The introduction of amphiphilicity to the constituents and interface assembly is one established technique to control supramolecular structures and resulting material properties. To yield amphiphilicity, rather hydrophobic chromophores are linked to hydrophilic head groups via flexible alkyl chains. In the present work, we investigate whether replacement of the alkyl linkers by a phenylene linker, that is, replacing an electrically isolating moiety with a potentially semiconducting one, increases the conductivity through the resulting layers. After investigating the influence of the linker on molecular properties of the 2-(4- N, N-dimethylaminophenyl)-4-hydroxy-5-nitrophenyl-1,3 thiazoles exemplarily used in this work, we produce supramolecular structures by means of the Langmuir-Blodgett (LB) technique. Atomic force microscopy (AFM) and UV-vis absorption spectroscopy reveal that thin films made from the more rigid thiazole bearing the arylic linker feature a more homogeneous and stable supramolecular structure as compared to those made from the thiazole dye containing the flexible alkylic linker. Finally, conductive AFM (cAFM) results disclose that the LB films made from the thiazole bearing the π-conjugated arylic linker are less conductive than their counterparts based on the alkylic linkers. In the latter layers, the alkylic linkers provide sufficient motional degrees of freedom to allow for supramolecular rearrangement upon electrical operation during cAFM measurements, hence yielding supramolecular structures featuring increased conductivity with successive cAFM measurements. This work highlights the importance of supramolecular structures for optoelectronic properties by presenting a case where supramolecular effects excel the property changes introduced by molecular modifications.
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Affiliation(s)
- M L Hupfer
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - M Kaufmann
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Institute of Organic and Macromolecular Chemistry , Friedrich-Schiller-University Jena , Humboldtstraße 10 , Jena 07743 , Germany
| | - L Roussille
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - J Preiß
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - D Weiß
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - K Hinrichs
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V. , Schwarzschildstr. 8 , 12489 Berlin , Germany
| | - V Deckert
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - B Dietzek
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - R Beckert
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
| | - M Presselt
- Institute of Physical Chemistry , Friedrich Schiller University Jena , Helmholtzweg 4 , 07743 Jena , Germany
- Leibniz Institute of Photonic Technology (IPHT) , Albert-Einstein-Str. 9 , 07745 Jena , Germany
- Center for Energy and Environmental Chemistry Jena (CEEC Jena) , Friedrich Schiller University Jena , Jena 07743 , Germany
- Sciclus GmbH & Co. KG , Moritz-von-Rohr Str. 1a , 07745 Jena , Germany
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10
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Kaufmann M, Hupfer M, Sachse T, Herrmann-Westendorf F, Weiß D, Dietzek B, Beckert R, Presselt M. Introducing double polar heads to highly fluorescent Thiazoles: Influence on supramolecular structures and photonic properties. J Colloid Interface Sci 2018; 526:410-418. [DOI: 10.1016/j.jcis.2018.04.105] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 04/27/2018] [Accepted: 04/27/2018] [Indexed: 10/17/2022]
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11
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Langmuir-monolayer methodologies for characterizing protein-lipid interactions. Chem Phys Lipids 2018; 212:61-72. [DOI: 10.1016/j.chemphyslip.2018.01.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/22/2017] [Accepted: 01/18/2018] [Indexed: 12/22/2022]
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12
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Interaction between C18 fatty acids and DOPE PEG2000 in Langmuir monolayers: effect of degree of unsaturation. J Biol Phys 2017; 43:397-414. [PMID: 28752254 DOI: 10.1007/s10867-017-9459-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 06/01/2017] [Indexed: 12/31/2022] Open
Abstract
In this study, we address the effect of the cis-double bond in 1,2-dioleoyl-sn-glycero-3-phosphoethanolamide-N-[methoxy(polyethylene glycol)-2000, DOPE PEG2000 (DP), on the Langmuir monolayer of C18 fatty acids-namely, stearic acid (SA), oleic acid (L1), linoleic acid (L2), and linolenic acid (L3)-with the same head group but different degrees of saturation on their hydrocarbon chains. Negative values of Gibbs free energy of mixing (ΔG mix) were obtained throughout the investigated ranges of the unsaturated C18 fatty-acid (L1, L2 and L3) mixed systems, indicating that very strong attractions occurred between molecules in the monolayers. The bend and kink effects from the cis-double bond(s) in the hydrocarbon chain affected the membrane fluidity and molecular packing in the monolayers, which resulted in a greater interaction between unsaturated C18 fatty acids and DP. The most thermodynamically stable mole composition of unsaturated C18 fatty acids to DP was observed at 50:1; this ratio is suggested to be the best mole ratio and will be subsequently used to prepare DP-C18 fatty-acid nanoliposomes. The presence of cis-double bonds in both hydrocarbon chains of DOPE in DP also created an imperfection in the membrane structure of lipid-drug delivery systems, which is expected to enhance lipid-based systems for antibody conjugation and drug encapsulation.
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Gew LT, Misran M. Energetic mixing of anti-SNAP25 on lipid monolayers: degree of saturation of C18 fatty acids. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.6144] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lai Ti Gew
- Department of Biological Sciences, Faculty of Science and Technology; Sunway University; No. 5, Jalan Universiti, Bandar Sunway 47500 Petaling Jaya Selangor Malaysia
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
| | - Misni Misran
- Department of Chemistry, Faculty of Science; University of Malaya; Kuala Lumpur 50603 Malaysia
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Poulin P, Burczynski FJ, Haddad S. The Role of Extracellular Binding Proteins in the Cellular Uptake of Drugs: Impact on Quantitative In Vitro-to-In Vivo Extrapolations of Toxicity and Efficacy in Physiologically Based Pharmacokinetic-Pharmacodynamic Research. J Pharm Sci 2016; 105:497-508. [PMID: 26173749 DOI: 10.1002/jps.24571] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 06/18/2015] [Accepted: 06/18/2015] [Indexed: 01/10/2023]
Abstract
A critical component in the development of physiologically based pharmacokinetic-pharmacodynamic (PBPK/PD) models for estimating target organ dosimetry in pharmacology and toxicology studies is the understanding of the uptake kinetics and accumulation of drugs and chemicals at the cellular level. Therefore, predicting free drug concentrations in intracellular fluid will contribute to our understanding of concentrations at the site of action in cells in PBPK/PD research. Some investigators believe that uptake of drugs in cells is solely driven by the unbound fraction; conversely, others argue that the protein-bound fraction contributes a significant portion of the total amount delivered to cells. Accordingly, the current literature suggests the existence of a so-called albumin-mediated uptake mechanism(s) for the protein-bound fraction (i.e., extracellular protein-facilitated uptake mechanisms) at least in hepatocytes and cardiac myocytes; however, such mechanism(s) and cells from other organs deserve further exploration. Therefore, the main objective of this present study was to discuss further the implication of potential protein-facilitated uptake mechanism(s) on drug distribution in cells under in vivo conditions. The interplay between the protein-facilitated uptake mechanism(s) and the effects of a pH gradient, metabolism, transport, and permeation limitation potentially occurring in cells was also discussed, as this should violate the basic assumption on similar free drug concentration in cells and plasma. This was made because the published equations used to calculate drug concentrations in cells in a PBPK/PD model did not consider potential protein-facilitated uptake mechanism(s). Consequently, we corrected some published equations for calculating the free drug concentrations in cells compared with plasma in PBPK/PD modeling studies, and we proposed a refined strategy for potentially performing more accurate quantitative in vitro-to-in vivo extrapolations (IVIVEs) of toxicity (efficacy) at the cellular level from data generated in cell assays. Overall, this present study may help to optimize the human dose prediction in preclinical and clinical studies, while prescribing drugs with narrow therapeutic windows that are highly bound to extracellular proteins and/or highly ionized at the physiological pH. This may facilitate building a more accurate safety (efficacy) profile for such drugs.
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Affiliation(s)
- Patrick Poulin
- Consultant, Québec city, Québec, Canada; Department of Occupational and Environmental Health, School of Public Health, IRSPUM, Université de Montréal, Québec, Canada.
| | - Frank J Burczynski
- Department of Pharmacology and Therapeutics, Faculty of Pharmacy, University of Manitoba, Manitoba, Canada
| | - Sami Haddad
- Department of Occupational and Environmental Health, School of Public Health, IRSPUM, Université de Montréal, Québec, Canada
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