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Manko H, Burton MG, Mély Y, Godet J. Spectral Phasor Applied to Spectrally-Resolved Single Molecule Localization Microscopy. Chemphyschem 2024; 25:e202400101. [PMID: 38563617 DOI: 10.1002/cphc.202400101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/12/2024] [Accepted: 03/27/2024] [Indexed: 04/04/2024]
Abstract
Spectrally-resolved single-molecule localization microscopy (srSMLM) has emerged as a powerful tool for exploring the spectral properties of single emitters in localization microscopy. By simultaneously capturing the spatial positions and spectroscopic signatures of individual fluorescent molecules, srSMLM opens up the possibility of investigating an additional dimension in super-resolution imaging. However, appropriate and dedicated tools are required to fully capitalize on the spectral dimension. Here, we propose the application of the spectral phasor analysis as an effective method for summarizing and analyzing the spectral information obtained from srSMLM experiments. The spectral phasor condenses the complete spectrum of a single emitter into a two-dimensional space, preserving key spectral characteristics for single-molecule spectral exploration. We demonstrate the effectiveness of spectral phasor in efficiently classifying single Nile Red fluorescence emissions from largely overlapping cyanine fluorescence signals in dual-color PAINT experiments. Additionally, we employed spectral phasor with srSMLM to reveal subtle alterations occurring in the membrane of Gram-positive Enterococcus hirae in response to gramicidin exposure, a membrane-perturbing antibiotic treatment. Spectral phasor provides a robust, model-free analytic tool for the detailed analysis of the spectral component of srSMLM, enhancing the capabilities of multi-color spectrally-resolved single-molecule imaging.
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Affiliation(s)
- Hanna Manko
- Laboratoire de BioImagerie et Pathologies, UMR CNRS 7021, ITI InnoVec, Université de Strasbourg, Illkirch, France
| | - Matthew G Burton
- Laboratoire de BioImagerie et Pathologies, UMR CNRS 7021, ITI InnoVec, Université de Strasbourg, Illkirch, France
- Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Yves Mély
- Laboratoire de BioImagerie et Pathologies, UMR CNRS 7021, ITI InnoVec, Université de Strasbourg, Illkirch, France
| | - Julien Godet
- Laboratoire iCube, UMR CNRS 7357, Equipe IMAGeS, Université de Strasbourg, Strasbourg, France
- Groupe Méthodes Recherche Clinique, Hôpitaux Universitaires de trasbourg, France
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2
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Lauritsen L, Szomek M, Hornum M, Reinholdt P, Kongsted J, Nielsen P, Brewer JR, Wüstner D. Ratiometric fluorescence nanoscopy and lifetime imaging of novel Nile Red analogs for analysis of membrane packing in living cells. Sci Rep 2024; 14:13748. [PMID: 38877068 PMCID: PMC11178856 DOI: 10.1038/s41598-024-64180-8] [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: 12/18/2023] [Accepted: 06/05/2024] [Indexed: 06/16/2024] Open
Abstract
Subcellular membranes have complex lipid and protein compositions, which give rise to organelle-specific membrane packing, fluidity, and permeability. Due to its exquisite solvent sensitivity, the lipophilic fluorescence dye Nile Red has been used extensively to study membrane packing and polarity. Further improvement of Nile Red can be achieved by introducing electron-donating or withdrawing functional groups. Here, we compare the potential of derivatives of Nile Red with such functional substitutions for super-resolution fluorescence microscopy of lipid packing in model membranes and living cells. All studied Nile Red derivatives exhibit cholesterol-dependent fluorescence changes in model membranes, as shown by spectrally resolved stimulated emission depletion (STED) microscopy. STED imaging of Nile Red probes in cells reveals lower membrane packing in fibroblasts from healthy subjects compared to those from patients suffering from Niemann Pick type C1 (NPC1) disease, a lysosomal storage disorder with accumulation of cholesterol and sphingolipids in late endosomes and lysosomes. We also find small but consistent changes in the fluorescence lifetime of the Nile Red derivatives in NPC1 cells, suggesting altered hydrogen-bonding capacity in their membranes. All Nile Red derivatives are essentially non-fluorescent in water but increase their brightness in membranes, allowing for their use in MINFLUX single molecule tracking experiments. Our study uncovers the potential of Nile Red probes with functional substitutions for nanoscopic membrane imaging.
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Affiliation(s)
- Line Lauritsen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Maria Szomek
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Mick Hornum
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Peter Reinholdt
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Jacob Kongsted
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Poul Nielsen
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Jonathan R Brewer
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Daniel Wüstner
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark.
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3
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Meng J, Yasui C, Shida M, Toshima K, Takahashi D. Designed Mannosylerythritol Lipid Analogues Exhibiting Both Selective Cytotoxicity Against Human Skin Cancer Cells and Recovery Effects on Damaged Skin Cells. Chemistry 2024:e202401319. [PMID: 38802321 DOI: 10.1002/chem.202401319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/24/2024] [Accepted: 05/27/2024] [Indexed: 05/29/2024]
Abstract
Mannosylerythritol lipids (MELs) are a class of amphipathic molecules bearing a hydrophilic 4-O-β-D-mannopyranosyl-D-erythritol skeleton. Here, we designed and synthesized four kinds of MEL analogues R-MEL-A ([2R,3S]-erythritol type), S-mannosylthreitol lipid (MTL)-A ([2S,3S]-threitol type), R-MTL-A ([2R,3R]-threitol type), and α-S-MEL-A ([2S,3R]-erythritol type) using our previously reported boron-mediated aglycon delivery (BMAD) method and a neighboring group assisted glycosylation method. The selective cytotoxicity of the target compounds against cancer cells was evaluated, with R-MTL-A showing the highest selective cytotoxicity against human skin squamous carcinoma HSC-5 cells. Our findings suggest that R-MTL-A induces necrosis-like cell death against HSC-5 cells by decreasing cell membrane fluidity. R-MTL-A also exhibits an efficient recovery effect on damaged skin cells, indicating that R-MTL-A has potential as a lead compound for new cosmeceuticals with both cancer cell-selective toxicity and recovery effects on damaged skin cells.
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Affiliation(s)
- Jikun Meng
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Chihiro Yasui
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Mai Shida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Kazunobu Toshima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Daisuke Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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4
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Abioye SO, Majooni Y, Moayedi M, Rezvani H, Kapadia M, Yousefi N. Graphene-based nanomaterials for the removal of emerging contaminants of concern from water and their potential adaptation for point-of-use applications. CHEMOSPHERE 2024; 355:141728. [PMID: 38499073 DOI: 10.1016/j.chemosphere.2024.141728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 03/08/2024] [Accepted: 03/14/2024] [Indexed: 03/20/2024]
Abstract
Considering the plethora of work on the exceptional environmental performance of 2D nanomaterials, there is still a missing link in addressing their practical application in point-of-use (POU) water treatment. By reviewing the exceptional environmental performance of 2D nanomaterials with specific emphasis on graphene and its derivatives, this review aims at inspiring further discussions and research in graphene-based POU water treatment with particular focus on the removal of emerging contaminants of concern (ECCs), which is largely missing in the literature. We outlined the prevalence of ECCs in the environment, their health effects both on humans and marine life, and the potential of efficiently removing them from water using three-dimensional graphene-based macrostructures to ensure ease of adsorbent recovery and reuse compared to nanostructures. Given various successful studies showing superior adsorption capacity of graphene nanosheets, we give an account of the recent developments in graphene-based adsorbents. Moreover, several cost-effective materials which can be easily self-assembled with nanosheets to improve their environmental performance and safety for POU water treatment purposes were highlighted. We highlighted the strategy to overcome challenges of adsorbent regeneration and contaminant degradation; and concluded by noting the need for policy makers to act decisively considering the conservative nature of the water treatment industry, and the potential health risks from ingesting ECCs through drinking water. We further justified the need for the development of advanced POU water treatment devices in the face of the growing challenges regarding ECCs in surface water, and the rising cases of drinking water advisories across the world.
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Affiliation(s)
- Samson Oluwafemi Abioye
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada
| | - Yalda Majooni
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada; Department of Aerospace Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada
| | - Mahsa Moayedi
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada
| | - Hadi Rezvani
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada
| | - Mihir Kapadia
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada
| | - Nariman Yousefi
- Department of Chemical Engineering, Toronto Metropolitan University, 350 Victoria Street, Toronto, M5B 2K3, ON, Canada.
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5
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Gupta A, Kallianpur M, Roy DS, Engberg O, Chakrabarty H, Huster D, Maiti S. Different membrane order measurement techniques are not mutually consistent. Biophys J 2023; 122:964-972. [PMID: 36004780 PMCID: PMC10111216 DOI: 10.1016/j.bpj.2022.08.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 08/10/2022] [Accepted: 08/19/2022] [Indexed: 11/25/2022] Open
Abstract
"Membrane order" is a term commonly used to describe the elastic and mechanical properties of the lipid bilayer, though its exact meaning is somewhat context- and method dependent. These mechanical properties of the membrane control many cellular functions and are measured using various biophysical techniques. Here, we ask if the results obtained from various techniques are mutually consistent. Such consistency cannot be assumed a priori because these techniques probe different spatial locations and different spatial and temporal scales. We evaluate the change of membrane order induced by serotonin using nine different techniques in lipid bilayers of three different compositions. Serotonin is an important neurotransmitter present at 100s of mM concentrations in neurotransmitter vesicles, and therefore its interaction with the lipid bilayer is biologically relevant. Our measurement tools include fluorescence of lipophilic dyes (Nile Red, Laurdan, TMA-DPH, DPH), whose properties are a function of membrane order; atomic force spectroscopy, which provides a measure of the force required to indent the lipid bilayer; 2H solid-state NMR spectroscopy, which measures the molecular order of the lipid acyl chain segments; fluorescence correlation spectroscopy, which provides a measure of the diffusivity of the probe in the membrane; and Raman spectroscopy, where spectral intensity ratios are affected by acyl chain order. We find that different measures often do not correlate with each other and sometimes even yield conflicting results. We conclude that no probe provides a general measure of membrane order and that any inference based on the change of membrane order measured by a particular probe may be unreliable.
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Affiliation(s)
- Ankur Gupta
- Tata Institute of Fundamental Research, Colaba, Mumbai, India
| | | | | | - Oskar Engberg
- Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany
| | | | - Daniel Huster
- Tata Institute of Fundamental Research, Colaba, Mumbai, India; Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany.
| | - Sudipta Maiti
- Tata Institute of Fundamental Research, Colaba, Mumbai, India.
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6
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Anselmo S, Sancataldo G, Baiamonte C, Pizzolanti G, Vetri V. Transportan 10 Induces Perturbation and Pores Formation in Giant Plasma Membrane Vesicles Derived from Cancer Liver Cells. Biomolecules 2023; 13:biom13030492. [PMID: 36979427 PMCID: PMC10046094 DOI: 10.3390/biom13030492] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/02/2023] [Accepted: 03/04/2023] [Indexed: 03/30/2023] Open
Abstract
Continuous progress has been made in the development of new molecules for therapeutic purposes. This is driven by the need to address several challenges such as molecular instability and biocompatibility, difficulties in crossing the plasma membrane, and the development of host resistance. In this context, cell-penetrating peptides (CPPs) constitute a promising tool for the development of new therapies due to their intrinsic ability to deliver therapeutic molecules to cells and tissues. These short peptides have gained increasing attention for applications in drug delivery as well as for their antimicrobial and anticancer activity but the general rules regulating the events involved in cellular uptake and in the following processes are still unclear. Here, we use fluorescence microscopy methods to analyze the interactions between the multifunctional peptide Transportan 10 (TP10) and the giant plasma membrane vesicles (GPMVs) derived from cancer cells. This aims to highlight the molecular mechanisms underlying functional interactions which bring its translocation across the membrane or cytotoxic mechanisms leading to membrane collapse and disruption. The Fluorescence Lifetime Imaging Microscopy (FLIM) method coupled with the phasor approach analysis proved to be the winning choice for following highly dynamic spatially heterogeneous events in real-time and highlighting aspects of such complex phenomena. Thanks to the presented approach, we were able to identify and monitor TP10 translocation into the lumen, internalization, and membrane-induced modifications depending on the peptide concentration regime.
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Affiliation(s)
- Sara Anselmo
- Dipartimento di Fisica e Chimica-Emilio Segré, Università degli Studi di Palermo, 90128 Palermo, Italy
| | - Giuseppe Sancataldo
- Dipartimento di Fisica e Chimica-Emilio Segré, Università degli Studi di Palermo, 90128 Palermo, Italy
| | - Concetta Baiamonte
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche, Università degli Studi di Palermo, 90128 Palermo, Italy
- AteN Center-Advanced Technologies Network Center, Università degli Studi di Palermo, 90128 Palermo, Italy
| | - Giuseppe Pizzolanti
- AteN Center-Advanced Technologies Network Center, Università degli Studi di Palermo, 90128 Palermo, Italy
- Dipartimento di Promozione della Salute, Materno-Infantile, di Medicina Interna e Specialistica di Eccellenza "G. D'Alessandro", Università degli Studi di Palermo, 90127 Palermo, Italy
| | - Valeria Vetri
- Dipartimento di Fisica e Chimica-Emilio Segré, Università degli Studi di Palermo, 90128 Palermo, Italy
- AteN Center-Advanced Technologies Network Center, Università degli Studi di Palermo, 90128 Palermo, Italy
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7
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Martens KJA, Gobes M, Archontakis E, Brillas RR, Zijlstra N, Albertazzi L, Hohlbein J. Enabling Spectrally Resolved Single-Molecule Localization Microscopy at High Emitter Densities. NANO LETTERS 2022; 22:8618-8625. [PMID: 36269936 PMCID: PMC9650776 DOI: 10.1021/acs.nanolett.2c03140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Single-molecule localization microscopy (SMLM) is a powerful super-resolution technique for elucidating structure and dynamics in the life- and material sciences. Simultaneously acquiring spectral information (spectrally resolved SMLM, sSMLM) has been hampered by several challenges: an increased complexity of the optical detection pathway, lower accessible emitter densities, and compromised spatio-spectral resolution. Here we present a single-component, low-cost implementation of sSMLM that addresses these challenges. Using a low-dispersion transmission grating positioned close to the image plane, the +1stdiffraction order is minimally elongated and is analyzed using existing single-molecule localization algorithms. The distance between the 0th and 1st order provides accurate information on the spectral properties of individual emitters. This method enables a 5-fold higher emitter density while discriminating between fluorophores whose peak emissions are less than 15 nm apart. Our approach can find widespread use in single-molecule applications that rely on distinguishing spectrally different fluorophores under low photon conditions.
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Affiliation(s)
- Koen J. A. Martens
- Laboratory
of Biophysics, Wageningen University and
Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Martijn Gobes
- Laboratory
of Biophysics, Wageningen University and
Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Emmanouil Archontakis
- Department
of Biomedical Engineering, Institute for Complex Molecular Systems
(ICMS), Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
| | - Roger R. Brillas
- Department
of Biomedical Engineering, Institute for Complex Molecular Systems
(ICMS), Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
| | - Niels Zijlstra
- Laboratory
of Biophysics, Wageningen University and
Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Lorenzo Albertazzi
- Department
of Biomedical Engineering, Institute for Complex Molecular Systems
(ICMS), Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
- Nanoscopy
for Nanomedicine, Institute for Bioengineering
of Catalonia, 08028 Barcelona, Spain
| | - Johannes Hohlbein
- Laboratory
of Biophysics, Wageningen University and
Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Microspectroscopy
Research Facility, Wageningen University
and Research, Stippeneng
4, 6708 WE Wageningen, The Netherlands
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8
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Goyal Y, Koul A, Ranawat P. Ellagic acid modulates cisplatin toxicity in DMH induced colorectal cancer: Studies on membrane alterations. Biochem Biophys Rep 2022; 31:101319. [PMID: 35990576 PMCID: PMC9386026 DOI: 10.1016/j.bbrep.2022.101319] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/24/2022] [Accepted: 07/23/2022] [Indexed: 11/25/2022] Open
Abstract
Systemic toxicity due to chemotherapy contributes to poor prognosis in patients receiving chemotherapy. The present study, therefore, explores the role of Ellagic acid, a phytochemical, in modulating cisplatin (CP) toxicity in dimethylhydrazine-induced colorectal cancer. Colons excised from DMH administered animals showed abnormal crypts and bulges over the mucosal surface. SEM revealed significant alterations and dysplastic lesions in DMH administered mice. Animals receiving combined treatment showed improvement in colonic epithelium with lesser irregularities. DMH and CP administration disturbed the membrane dynamics and integrity as observed with the fluorescent probes DPH and pyrene. However, EA co-supplementation with CP proved to be beneficial in normalizing the altered membrane. Ellagic acid co-supplementation along with CP; therefore, showed great promise and helped restore the membrane alterations in the colon caused due to CP-induced toxicity and DMH insult. These observations could pave way towards developing a combination therapy targeting colon carcinogenesis in future. Colorectal tumor initiation as evident by the presence of ACFs (pre-neoplastic lesions). DMH and Cisplatin altered the membrane dynamics. Ellagic acid helped restore the membrane structure as evidenced through SEM. Membrane dynamics were also improved, as evidenced through lipid packing and lateral diffusion. Structural alterations monitored through FT-IR were also improved upon Ellagic acid co-supplementation.
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9
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Zaytseva YV, Surovtsev NV. Raman scattering in protonated and deuterated 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC): Indicators of conformational and lateral orders. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 267:120583. [PMID: 34782267 DOI: 10.1016/j.saa.2021.120583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 06/13/2023]
Abstract
The use of deuterocarbons is an effective method in the Raman spectroscopy of multicomponent lipid materials and biological samples. Here, Raman spectra of hydrated multilamellar vesicles of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), its deuterated analog 1,2-dipalmitoyl-d62-sn-glycero-3-phosphocholine (DPPCd62), and DPPC-DPPCd62 mixtures were studied in a wide temperature range to specify the Raman indicators of conformational and lateral orders. The temperature dependence of the 985 cm-1 line in the deuterated phospholipid unequivocally indicates that this line corresponds to the CC stretching vibrations of deuterated hydrocarbon chains in the all-trans conformation. It was also concluded that the ratio of Raman intensities at the maximum of the peak of the symmetric CD2 stretching and at a maximum near 2168 cm-1 reflects the conformational order of the hydrocarbon chain and can be used for an evaluation of the fraction of the all-trans sequences. The frequency of the symmetric CD2 stretching peak is sensitive to the phase state (gel or fluid) but has a low sensitivity to the partial conformational disordering within the gel phase. The Raman study of DPPC-DPPCd62 mixtures reveals that the lateral order contributes to the ratio of intensities of the antisymmetric and symmetric CH2 stretching peaks as a prefactor enhancing the effect of conformational ordering.
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Affiliation(s)
- Yu V Zaytseva
- Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - N V Surovtsev
- Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk 630090, Russia.
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10
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Zhang O, Zhou W, Lu J, Wu T, Lew MD. Resolving the Three-Dimensional Rotational and Translational Dynamics of Single Molecules Using Radially and Azimuthally Polarized Fluorescence. NANO LETTERS 2022; 22:1024-1031. [PMID: 35073487 PMCID: PMC8893020 DOI: 10.1021/acs.nanolett.1c03948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report a radially and azimuthally polarized (raPol) microscope for high detection and estimation performance in single-molecule orientation-localization microscopy (SMOLM). With 5000 photons detected from Nile red (NR) transiently bound within supported lipid bilayers (SLBs), raPol SMOLM achieves 2.9 nm localization precision, 1.5° orientation precision, and 0.17 sr precision in estimating rotational wobble. Within DPPC SLBs, SMOLM imaging reveals the existence of randomly oriented binding pockets that prevent NR from freely exploring all orientations. Treating the SLBs with cholesterol-loaded methyl-β-cyclodextrin (MβCD-chol) causes NR's orientational diffusion to be dramatically reduced, but curiously NR's median lateral displacements drastically increase from 20.8 to 75.5 nm (200 ms time lag). These jump diffusion events overwhelmingly originate from cholesterol-rich nanodomains within the SLB. These detailed measurements of single-molecule rotational and translational dynamics are made possible by raPol's high measurement precision and are not detectable in standard SMLM.
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11
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Caruso B, Wilke N, Perillo MA. Triglyceride Lenses at the Air-Water Interface as a Model System for Studying the Initial Stage in the Biogenesis of Lipid Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10958-10970. [PMID: 34491757 DOI: 10.1021/acs.langmuir.1c01359] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Lipid droplets (LD) are intracellular structures consisting of an apolar lipid core, composed mainly of triglycerides (TG) and steryl esters, coated by a lipid-protein mixed monolayer. The mechanisms underlying LD biogenesis at the endoplasmic reticulum membrane are a matter of many current investigations. Although models explaining the budding-off of protuberances of phase-segregated TG inside bilayers have been proposed recently, the assumption of such initial blisters needs further empirical support. Here, we study mixtures of egg phosphatidylcholine (EPC) and TG at the air-water interface in order to describe some physical properties and topographic stability of TG bulk structures in contact with interfaces. Brewster angle microscopy images revealed the appearance of microscopic collapsed structures (CS) with highly reproducible lateral size (∼1 μm lateral radius) not varying with lateral packing changes and being highly stable at surface pressures (π) beyond collapse. By surface spectral fluorescence microscopy, we were able to characterize the solvatochromism of Nile Red both in monolayers and inside CS. This allowed to conclude that CS corresponded to a phase of liquid TG and to characterize them as lenses forming a three-phase (oil-water-air) system. Thereby, the thicknesses of the lenses could be determined, observing that they were dramatically flattened when EPC was present (6-12 nm compared to 30-50 nm for lenses on EPC/TG and TG films, respectively). Considering the shape of lenses, the interfacial tensions, and the Neumann's triangle, this experimental approach allows one to estimate the oil-water interfacial tension acting at each individual microscopic lens and at varying compression states of the surrounding monolayer. Thus, lenses formed on air-water Langmuir films can serve to assess variables of relevance to the initial step of LD biogenesis, such as the degree of dispersion of excluded-TG phase and shape, spatial distribution, and oil-water interfacial tension of lenses.
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Affiliation(s)
- B Caruso
- Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química, Cátedra de Química BiológicaUniversidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET, X5016GCA Córdoba, Argentina
| | - N Wilke
- Facultad de Ciencias Químicas,. Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Centro de Investigaciones en Quimica Biológica de Córdoba (CIQUIBIC), CONICET, X5016GCA Córdoba, Argentina
| | - M A Perillo
- Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química, Cátedra de Química BiológicaUniversidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET, X5016GCA Córdoba, Argentina
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12
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Galluzzi M, Zhang B, Zhang H, Wang L, Lin Y, Yu XF, Chu Z, Li J. Unveiling a Hidden Event in Fluorescence Correlative Microscopy by AFM Nanomechanical Analysis. Front Mol Biosci 2021; 8:669361. [PMID: 34026842 PMCID: PMC8136518 DOI: 10.3389/fmolb.2021.669361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/22/2021] [Indexed: 11/18/2022] Open
Abstract
Fluorescent imaging combined with atomic force microscopy (AFM), namely AFM-fluorescence correlative microscopy, is a popular technology in life science. However, the influence of involved fluorophores on obtained mechanical information is normally underestimated, and such subtle changes are still challenging to detect. Herein, we combined AFM with laser light excitation to perform a mechanical quantitative analysis of a model membrane system labeled with a commonly used fluorophore. Mechanical quantification was additionally validated by finite element simulations. Upon staining, we noticed fluorophores forming a diffuse weakly organized overlayer on phospholipid supported membrane, easily detected by AFM mechanics. The laser was found to cause a degradation of mechanical stability of the membrane synergically with presence of fluorophore. In particular, a 30 min laser irradiation, with intensity similar to that in typical confocal scanning microscopy experiment, was found to result in a ∼40% decrease in the breakthrough force of the stained phospholipid bilayer along with a ∼30% reduction in its apparent elastic modulus. The findings highlight the significance of analytical power provided by AFM, which will allow us to “see” the “unseen” in correlative microscopy, as well as the necessity to consider photothermal effects when using fluorescent dyes to investigate, for example, the deformability and permeability of phospholipid membranes.
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Affiliation(s)
- Massimiliano Galluzzi
- Materials Interfaces Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Bokai Zhang
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,DGene (Dongjin Big Health (Shenzhen)) Co., Ltd., Shenzhen, China.,BenHealth Biopharmaceutical (Shenzhen) Co., Ltd., Shenzhen, China
| | - Han Zhang
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,State Key Laboratory of Traction Power, Southwest Jiaotong Univerisity, Chengdu, China
| | - Lingzhi Wang
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong
| | - Yuan Lin
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong.,Advanced Biomedical Instrumentation Centre, Shatin, Hong Kong
| | - Xue-Feng Yu
- Materials Interfaces Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Zhiqin Chu
- Department of Electrical and Electronic Engineering, Joint Appointment with School of Biomedical Sciences, The University of Hong Kong, Hong Kong
| | - Jiangyu Li
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China
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13
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Du Y, Yang Z, Sun Q, Lin M, Wang R, Peng Y, Chen X, Qi X. Engineered Microglia Potentiate the Action of Drugs against Glioma Through Extracellular Vesicles and Tunneling Nanotubes. Adv Healthc Mater 2021; 10:e2002200. [PMID: 33644993 DOI: 10.1002/adhm.202002200] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/11/2021] [Indexed: 01/08/2023]
Abstract
Gliomas remain difficult to treat because of their metastatic and recurrent nature and the existence of the blood-brain barrier (BBB), which impedes drug delivery. Microglia, the resident macrophages in the CNS, can be recruited by gliomas and can penetrate the tumor. In this study, microglia (BV2 cells) are used as transport vectors to deliver paclitaxel for the treatment of glioma. To avoid paclitaxel toxicity in microglia, liposomes are first employed to isolate the drug from BV2 cells. Dipalmitoyl phosphatidylserine (DPPS), as an "eat me" signal, is doped into liposomes to amplify their phagocytosis by microglia. This study demonstrates that engineered microglia can cross the BBB, independently migrate toward gliomas, and transfer cargo to glioma cells. Of note, extracellular vesicles and tunneling nanotubes are found to offer unique modes of cargo transportation between microglia and glioma cells. In vivo, the engineered drug-loaded microglia has a high ability to target the brain, penetrate glioma, and suppress tumor progression, supporting the notion that the use of engineered microglia is a potential strategy for the treatment of glioma. These findings present new opportunities for exploration into the use of microglia as transport vectors to deliver therapeutic agents through specific membrane nanotubes and vesicles.
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Affiliation(s)
- Yitian Du
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Zhenzhen Yang
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Qi Sun
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Meng Lin
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Rudong Wang
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Yiwei Peng
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Xinyi Chen
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
| | - Xianrong Qi
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems School of Pharmaceutical Sciences Peking University 38 Xueyuan Road, Haidian District Beijing 100191 P. R. China
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14
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Sahu S, Talele P, Patra B, Verma RS, Mishra AK. A Multiparametric Fluorescence Probe to Understand the Physicochemical Properties of Small Unilamellar Lipid Vesicles in Poly(ethylene glycol)-Water Medium. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4842-4852. [PMID: 32283935 DOI: 10.1021/acs.langmuir.9b03902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
FDAPT (2-formyl-5-(4'-N,N-dimethylaminophenyl)thiophene) efficiently senses the minimum alteration of lipid bilayer microenvironment with all six different fluorescence parameters namely emission wavelength, fluorescence intensity, steady-state anisotropy, and their corresponding time-dependent parameters (Sahu et al., J. Phys. Chem. B 2018, 122, 7308-7318). In the present work, the effect of poly(ethylene glycol) on the small unilamellar vesicle is demonstrated with the emission behavior of the FDAPT probe. A medium and a high molecular weight PEG were chosen to perturb the lipid vesicles. The alteration of the bilayer polarity, water content inside bilayer, lipid packing density in the perturbed vesicles reflect significant changes in different fluorescence parameters of FDAPT probe. The effect of PEG on the unilamellar vesicle was rationalized with the alteration of the emission behavior, fluorescence lifetime, steady-state anisotropy and anisotropy decay of the probe. The simple and convenient fluorescence measurements provide new insights into the effect of PEG on the packing density, water volume, micro polarity, and microviscosity of the small unilamellar vesicle. The physiological understanding was extended to rationalize the cryoprotecting behavior of PEG.
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Affiliation(s)
- Saugata Sahu
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai-600036, Tamil Nadu India
| | - Paurnima Talele
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai-600036, Tamil Nadu India
| | - Bamadeb Patra
- Department of Biotechnology, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai-600036, Tamil Nadu India
| | - Rama Shanker Verma
- Department of Biotechnology, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai-600036, Tamil Nadu India
| | - Ashok Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai-600036, Tamil Nadu India
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15
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Sato Y, Kuwahara K, Mogami K, Takahashi K, Nishizawa S. Amphipathic helical peptide-based fluorogenic probes for a marker-free analysis of exosomes based on membrane-curvature sensing. RSC Adv 2020; 10:38323-38327. [PMID: 35517518 PMCID: PMC9057301 DOI: 10.1039/d0ra07763a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 10/11/2020] [Indexed: 01/08/2023] Open
Abstract
With increasing knowledge about the diverse roles of exosomes in the biological process, much attention has been paid to develop analytical methods for detection and quantification of exosomes. Immunoassays based on the recognition of exosomal protein markers by antibodies were widely used. However, considering that exosomal protein composition varies with the cell type, the protein markers should be carefully selected for a sensitive and selective analysis of target exosomes. Herein, we developed a new class of exosome-binding fluorogenic probes based on membrane curvature (MC) sensing of amphipathic helical (AH) peptides for exosome analysis without the need to use protein markers on the exosomal membranes. The C-terminal region of apolipoprotein A-I labeled with Nile red (ApoC-NR) exhibited a significant fluorescence enhancement upon selective binding to the highly curved membranes of synthetic vesicles. Circular dichroism (CD) measurements involving 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)/1-2-dioleoyl-sn-glycerol (DOG) vesicles suggested that ApoC-NR recognizes the lipid packing defects in the surface of highly curved membranes via the hydrophobic insertion of the α-helix structure of the ApoC unit. ApoC-NR exhibited a stronger binding affinity for exosome-sized vesicles and a higher MC selectivity compared to all other previously reported peptide probes. ApoC-NR can be used in a simple and rapid “mix and read” analysis of various kinds of exosomes derived from different cell types (limit of detection: –105 particles/μL) without being influenced by the variation in the expression of the surface proteins of the exosomes, which stands in sharp contrast to immunoassays. Fluorogenic probes based on membrane curvature sensing-amphipathic helical peptides have been developed for a marker-free exosome analysis.![]()
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Affiliation(s)
- Yusuke Sato
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Kazuki Kuwahara
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Kenta Mogami
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Kenta Takahashi
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Seiichi Nishizawa
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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16
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Wang W, Xing J, Ge Z. Evaluation of Nile Red-Loaded Mesoporous Silica Nanoparticles for Developing Water-Soaked Fingerprints on Thermal Paper. J Forensic Sci 2018; 64:717-727. [PMID: 30444941 DOI: 10.1111/1556-4029.13959] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 10/09/2018] [Accepted: 10/23/2018] [Indexed: 01/29/2023]
Abstract
Nile red has been an alternative reagent for detecting latent fingerprints on wetted substrates. However, the presence of methanol in nile red solution could make injury to handlers and destroy the traces on surfaces, such as texts on thermal papers. A novel small particle reagent formulation constituting of mesoporous silica nanoparticles (MSNs) based on nile red was prepared to overcome the problem. Compared with the conventional reagents Oil Red O or nile red solution, the nile red-loaded MSNs are highly selective to lipid residues of fingerprints and showed a greater ability to develop clear, sharp, and detailed fingerprints on thermal papers after these were immersed in water. In addition, it can retain texts on the thermal papers well and use only water as a solvent. These suggested that nile red-loaded MSNs are a safe, efficient, and convenient method to develop latent fingerprints on wide range of substrates of forensic importance.
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Affiliation(s)
- Wenjing Wang
- Key Laboratory of Systems Bioengineering (Ministry of Education), Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Jinfeng Xing
- Key Laboratory of Systems Bioengineering (Ministry of Education), Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Zhiqiang Ge
- Key Laboratory of Systems Bioengineering (Ministry of Education), Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
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17
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Maity P, Saha B, Suresh Kumar G, Karmakar S. Effect of Zwitterionic Phospholipid on the Interaction of Cationic Membranes with Monovalent Sodium Salts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9810-9817. [PMID: 30056708 DOI: 10.1021/acs.langmuir.8b01792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cationic lipids have attracted much attention because of their potential for biomedical applications, such as gene delivery. The gene transfection efficiency of cationic lipids is greatly influenced by the counterions as well as salt ions. We have systematically investigated the interaction of different monovalent sodium salts with positively charged membrane, composed of 1,2-dioleoyl- sn-glycero-3-phosphocholine (DOPC)/1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) and DOTAP, using dynamic light scattering, zeta potential, isothermal titration calorimetry (ITC), and fluorescence spectroscopy techniques. Our results reveal that the affinity of anions with cationic membranes follows the sequence I- ≫ Br- > Cl- according to descending order of their sizes and is consistent with the Hofmeister series. Interestingly, the electrostatic behavior of the DOTAP membrane in the presence of monovalent anions differs significantly from the DOPC/DOTAP membrane. This difference is due to the strong interplay between phosphocholine and trimethylammonium-propane (TAP) headgroups leading to the reorientation of the TAP group in the membrane. The binding constant of anions, derived from zeta potential and ITC is in agreement with the affinity of anions mentioned above. Among all anions, I- shows strongest affinity, as evidenced from the rapid increase in hydrodynamic radius which eventually leads to the formation of large aggregates. The fluorescence spectroscopy of a lypophilic probe Nile red in the presence of cationic vesicles containing ions complements the I- adsorption onto the membrane. Nonlinear Stern-Volmer plot, consisting of accessible and inaccessible Nile red to I- is consistent with the zeta potential as well as ITC results.
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Affiliation(s)
- Pabitra Maity
- Soft Matter and Biophysics Laboratory, Department of Physics , Jadavpur University , 188, Raja S. C. Mallick Road , Kolkata 700032 , India
| | - Baishakhi Saha
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division , CSIR-Indian Institute of Chemical Biology , 4, Raja S. C. Mallick Road , Kolkata 700 032 , India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division , CSIR-Indian Institute of Chemical Biology , 4, Raja S. C. Mallick Road , Kolkata 700 032 , India
| | - Sanat Karmakar
- Soft Matter and Biophysics Laboratory, Department of Physics , Jadavpur University , 188, Raja S. C. Mallick Road , Kolkata 700032 , India
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