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Lin YS, Chen HY, Yang YP. Fluorescence photobleaching and recovery of fluorescein sodium in carbomer film. RSC Adv 2024; 14:3841-3844. [PMID: 38274174 PMCID: PMC10810102 DOI: 10.1039/d3ra08718b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 01/20/2024] [Indexed: 01/27/2024] Open
Abstract
This study investigated fluorescence photobleaching and the recovery of fluorescein sodium (FS)-loaded carbomer films. To mitigate errors caused by the self-quenching effect, the experiments were conducted at FS concentrations of 0.1, 0.5, and 1 wt%. The results revealed a nonlinear relationship between fluorescence intensity and FS concentration (0.1-1 wt%). Moreover, the degree and rate of photobleaching increased with FS concentration. The recovery level and recovery rate exhibited contrasting relationships with FS concentration. Higher FS concentrations were associated with a longer recovery time, which can be attributed to the prolonged irradiation, resulting in a bleached region that was larger than the initially irradiated area.
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Affiliation(s)
- Yung-Sheng Lin
- Department of Chemical Engineering, National United University Taiwan
| | - Hao-Yan Chen
- Department of Chemical Engineering, National United University Taiwan
| | - Yih-Pey Yang
- Department of Biomechatronic Engineering, National Ilan University Taiwan
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Arul MR, Alahmadi I, Turro DG, Ruikar A, Abdulmalik S, Williams JT, Sanganahalli BG, Liang BT, Verma R, Kumbar SG. Fluorescent liposomal nanocarriers for targeted drug delivery in ischemic stroke therapy. Biomater Sci 2023; 11:7856-7866. [PMID: 37902365 PMCID: PMC10697427 DOI: 10.1039/d3bm00951c] [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: 06/02/2023] [Accepted: 10/18/2023] [Indexed: 10/31/2023]
Abstract
Ischemic stroke causes acute CNS injury and long-term disability, with limited treatment options such as surgical clot removal or clot-busting drugs. Neuroprotective therapies are needed to protect vulnerable brain regions. The purinergic receptor P2X4 is activated during stroke and exacerbates post-stroke damage. The chemical compound 5-(3-Bromophenyl)-1,3-dihydro-2H-Benzofuro[3,2-e]-1,4-diazepin-2-one (5BDBD) inhibits P2X4 and has shown neuroprotective effects in rodents. However, it is difficult to formulate for systemic delivery to the CNS. The current manuscript reports for the first time, the synthesis and characterization of 5BDBD PEGylated liposomal formulations and evaluates their feasibility to treat stroke in a preclinical mice model. A PEGylated liposomal formulation of 5BDBD was synthesized and characterized, with encapsulation efficacy of >80%, and release over 48 hours. In vitro and in vivo experiments with Nile red encapsulation showed cytocompatibility and CNS infiltration of nanocarriers. Administered 4 or 28 hours after stroke onset, the nanoformulation provided significant neuroprotection, reducing infarct volume by ∼50% compared to controls. It outperformed orally-administered 5BDBD with a lower dose and shorter treatment duration, suggesting precise delivery by nanoformulation improves outcomes. The fluorescent nanoformulations may serve as a platform for delivering and tracking therapeutic agents for stroke treatment.
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Affiliation(s)
- Michael R Arul
- Department of Orthopaedic Surgery, University of Connecticut Health, Farmington, CT, USA.
| | - Ibtihal Alahmadi
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | | | - Aditya Ruikar
- Department of Orthopaedic Surgery, University of Connecticut Health, Farmington, CT, USA.
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | - Sama Abdulmalik
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | | | - Basavaraju G Sanganahalli
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
| | - Bruce T Liang
- Calhuan Cardiology Centre, UConn Health, Farmington, CT, USA
| | - Rajkumar Verma
- Department of Neurosciences, UConn Health, Farmington, CT, USA.
| | - Sangamesh G Kumbar
- Department of Orthopaedic Surgery, University of Connecticut Health, Farmington, CT, USA.
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, USA
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Kenworthy AK. What's past is prologue: FRAP keeps delivering 50 years later. Biophys J 2023; 122:3577-3586. [PMID: 37218127 PMCID: PMC10541474 DOI: 10.1016/j.bpj.2023.05.016] [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: 02/09/2023] [Revised: 03/03/2023] [Accepted: 05/11/2023] [Indexed: 05/24/2023] Open
Abstract
Fluorescence recovery after photobleaching (FRAP) has emerged as one of the most widely utilized techniques to quantify binding and diffusion kinetics of biomolecules in biophysics. Since its inception in the mid-1970s, FRAP has been used to address an enormous array of questions including the characteristic features of lipid rafts, how cells regulate the viscosity of their cytoplasm, and the dynamics of biomolecules inside condensates formed by liquid-liquid phase separation. In this perspective, I briefly summarize the history of the field and discuss why FRAP has proven to be so incredibly versatile and popular. Next, I provide an overview of the extensive body of knowledge that has emerged on best practices for quantitative FRAP data analysis, followed by some recent examples of biological lessons learned using this powerful approach. Finally, I touch on new directions and opportunities for biophysicists to contribute to the continued development of this still-relevant research tool.
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Affiliation(s)
- Anne K Kenworthy
- Center for Membrane and Cell Physiology, University of Virginia, Charlottesville, Virginia; Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, Virginia.
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Muñiz‐Chicharro A, Votapka LW, Amaro RE, Wade RC. Brownian dynamics simulations of biomolecular diffusional association processes. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2022. [DOI: 10.1002/wcms.1649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Abraham Muñiz‐Chicharro
- Molecular and Cellular Modeling Group Heidelberg Institute for Theoretical Studies (HITS) Heidelberg Germany
- Faculty of Biosciences and Heidelberg Graduate School of Mathematical and Computational Methods for the Sciences (HGS MathComp) Heidelberg University Heidelberg Germany
| | | | | | - Rebecca C. Wade
- Molecular and Cellular Modeling Group Heidelberg Institute for Theoretical Studies (HITS) Heidelberg Germany
- Center for Molecular Biology (ZMBH), DKFZ‐ZMBH Alliance, and Interdisciplinary Center for Scientific Computing (IWR) Heidelberg University Heidelberg Germany
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