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Badgujar P, Malik AK, Mehata AK, Setia A, Verma N, Randhave N, Shukla VN, Kande V, Singh P, Tiwari P, Mahto SK, Muthu MS. Polyvinyl alcohol-chitosan based oleanolic acid nanofibers against bacterial infection: In vitro studies and in vivo evaluation by optical and laser Doppler imaging modalities. Int J Biol Macromol 2024; 279:135532. [PMID: 39265903 DOI: 10.1016/j.ijbiomac.2024.135532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 07/26/2024] [Accepted: 09/09/2024] [Indexed: 09/14/2024]
Abstract
The present work focuses on the fabrication of polyvinyl alcohol-chitosan-loaded oleanolic acid-nanofibers (PVA-CS-OLA-NFs) for bacterial infection. The prepared PVA-CS-OLA-NFs were characterized for contact angle, SEM, AFM, XRD, FTIR, and TGA. The solid-state characterization and in vitro performance evaluation of nanofibers reveal consistent interconnection and diameters ranging from 102 ± 9.5 to 386 ± 11.6 nm. The nanofibers have a flat surface topography and exhibit efficient drug entrapment. Moreover, the in vitro release profile of PVA-CS-OLA-NFs was found to be 51.82 ± 1.49 % at 24 h. Furthermore, the hemocompatibility study showed that the developed PVA-CS-OLA-NFs are non-hemolytic to human blood. The PVA-CS-OLA-NFs demonstrate remarkable antibacterial capabilities, as evidenced by their MBC and MIC values, which range from 128 and 32 μg/mL, against the strains of S. aureus. The in-vivo fluorescence optical imaging showed the sustained PVA-CS-OLA-NFs release at the wound site infected with S. aureus for a longer duration of time. Moreover, the PVA-CS-OLA-NFs showed superior wound healing performance against S. aureus infected wounds compared to the marketed formulation. Further, the laser Doppler imaging system improved oxygen saturation, blood supply, and wound healing by providing real-time blood flow and oxygen saturation information.
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Affiliation(s)
- Paresh Badgujar
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Ankit Kumar Malik
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Abhishesh Kumar Mehata
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Aseem Setia
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Nidhi Verma
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Nandini Randhave
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Vishwa Nath Shukla
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Vilas Kande
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Priya Singh
- School of Biomedical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Punit Tiwari
- Department of Microbiology, Institute of Medical Sciences, BHU, Varanasi 221005, Uttar Pradesh, India
| | - Sanjeev Kumar Mahto
- School of Biomedical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Madaswamy S Muthu
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
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2
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Herrera MG, Amundarain MJ, Dörfler PW, Dodero VI. The Celiac-Disease Superantigen Oligomerizes and Increases Permeability in an Enterocyte Cell Model. Angew Chem Int Ed Engl 2024; 63:e202317552. [PMID: 38497459 DOI: 10.1002/anie.202317552] [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: 11/17/2023] [Revised: 03/03/2024] [Accepted: 03/05/2024] [Indexed: 03/19/2024]
Abstract
Celiac disease (CeD) is an autoimmune disorder triggered by gluten proteins, affecting approximately 1 % of the global population. The 33-mer deamidated gliadin peptide (DGP) is a metabolically modified wheat-gluten superantigen for CeD. Here, we demonstrate that the 33-mer DGP spontaneously assembles into oligomers with a diameter of approximately 24 nm. The 33-mer DGP oligomers present two main secondary structural motifs-a major polyproline II helix and a minor β-sheet structure. Importantly, in the presence of 33-mer DGP oligomers, there is a statistically significant increase in the permeability in the gut epithelial cell model Caco-2, accompanied by the redistribution of zonula occludens-1, a master tight junction protein. These findings provide novel molecular and supramolecular insights into the impact of 33-mer DGP in CeD and highlight the relevance of gliadin peptide oligomerization.
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Affiliation(s)
- Maria G Herrera
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
- Department of Physiology and Molecular and Cellular Biology, Institute of Biosciences, Biotechnology and Translational Biology (iB3), Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires, C1428EG, Argentina
| | - Maria J Amundarain
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Philipp W Dörfler
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Veronica I Dodero
- Department of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
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3
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Johnson OM, Mangolini F. Effect of Camera Parallax Angle on the Accuracy of Static Contact Angle Measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5090-5097. [PMID: 38407033 DOI: 10.1021/acs.langmuir.3c03684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Measuring the contact angle at the solid/liquid/vapor triple point in sessile drop experiments is one of the most popular and simple ways to quantify the wettability of surfaces and determine the surface free energy. Despite decades of technical advancements in contact angle measurements, which allowed for improving the precision of sessile drop measurements below ±1°, an often overlooked source of experimental error in these measurements originates from the camera's parallax angle (PA) - the angle between the camera optical axis and the sample stage surface. Here, we quantified the systematic errors in the measurement of contact angles due to the acquisition of drop images at finite PA values by simulating sessile drop experiments in which synthetic drops were created using the Young-Laplace equation. The absolute contact angle error induced by imaging drops at nonzero PAs was found to increase as the true contact angle (TCA) deviates from 90° and resulted in an overestimation (underestimation) of the contact angle for drops having TCAs lower (higher) than 90°. The computed absolute contact angle error reaches values as high as -20° (+12.2°) for drops having a TCA of 175° (5°) when imaged with a PA of 10°, thus indicating the importance of considering the PA when accurately quantifying contact angles in sessile drop experiments. The shape and, by extension, volume of the sessile drop was also found to affect the magnitude of the absolute contact angle error as sessile drops with higher apex curvatures exhibited lower absolute error than those with lower curvatures at any given PA. The outcomes of this work provide guidelines for minimizing systematic errors in sessile drop measurements due to the collection of drop images at nonzero PAs.
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Affiliation(s)
- Owen M Johnson
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Filippo Mangolini
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
- Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
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4
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Manjit M, Kumar M, Jha A, Bharti K, Kumar K, Tiwari P, Tilak R, Singh V, Koch B, Mishra B. Formulation and characterization of polyvinyl alcohol/chitosan composite nanofiber co-loaded with silver nanoparticle & luliconazole encapsulated poly lactic-co-glycolic acid nanoparticle for treatment of diabetic foot ulcer. Int J Biol Macromol 2024; 258:128978. [PMID: 38145692 DOI: 10.1016/j.ijbiomac.2023.128978] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/30/2023] [Accepted: 12/20/2023] [Indexed: 12/27/2023]
Abstract
Chronic wounds are prone to fungal infections, possess a significant challenge, and result in substantial mortality. Diabetic wounds infected with Candida strains are extremely common. It can create biofilm at the wound site, which can lead to antibiotic resistance. As a result, developing innovative dressing materials that combat fungal infections while also providing wound healing is a viable strategy to treat infected wounds and address the issue of antibiotic resistance. Present work proposed anti-infective dressing material for the treatment of fungal strains Candida-infected diabetic foot ulcer (DFU). The nanofiber was fabricated using polyvinyl Alcohol/chitosan as hydrogel base and co-loaded with silver nanoparticles (AgNP) and luliconazole-nanoparticles (LZNP) nanoparticles, prepared using PLGA. Fabricated nanofibers had pH close to target area and exhibited hydrophilic surface suitable for adhesion to wound area. The nanofibers showed strong antifungal and antibiofilm properties against different strains of Candida; mainly C. albicans, C. auris, C. krusei, C. parapsilosis and C. tropicalis. Nanofibers exhibited excellent water retention potential and water vapour transmission rate. The nanofibers had sufficient payload capacity towards AgNP and LZNP, and provided controlled release of payload, which was also confirmed by in-vivo imaging. In-vitro studies confirmed the biocompatibility and enhanced proliferation of Human keratinocytes cells (HaCaT). In-vivo studies showed accelerated wound closure by providing ant-infective action, supporting cellular proliferation and improving blood flow, all collectively contributing in expedited wound healing.
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Affiliation(s)
- Manjit Manjit
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - Manish Kumar
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - Abhishek Jha
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - Kanchan Bharti
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - Krishan Kumar
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - Punit Tiwari
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India
| | - Ragini Tilak
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India
| | - Virendra Singh
- Cancer Biology Laboratory, Department of Zoology Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Biplob Koch
- Cancer Biology Laboratory, Department of Zoology Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Brahmeshwar Mishra
- Department of Pharmaceutical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
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5
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Odunsi MS, Morris JF, Shattuck MD. Hysteretic Behavior of Capillary Bridges between Flat Plates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13149-13157. [PMID: 37672710 DOI: 10.1021/acs.langmuir.3c01550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
We studied the evolution of capillary bridges between nominally flat plates undergoing multiple cycles of compression and stretching in experiments and simulations. We varied the distance between the plates in small increments to study the full evolution of the bridge shape. Experiments show that contact angle hysteresis determines the shape of the bridge. In sliding drops, hysteresis can be modeled using a contact angle-dependent resistive force F̃R applied at the contact line. We developed a model that accurately captures the evolution of the bridge shape by combining F̃R and constrained energy minimization. Unlike previous work, this allows for both complete and partial contact line pinning. We also explored the effect of using nonparallel plates. The asymmetry in the bridge shape causes the movement of the center of mass of the bridge and can be explained by contact angle hysteresis. We find that even a slight misalignment between the flat plates can have a measurable effect.
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Affiliation(s)
- Moyosore S Odunsi
- The City University of New York Graduate Center, Department of Physics, New York, New York 10016-4309, United States
- The City College of New York, The Benjamin Levich Institute, New York, New York 10031, United States
| | - Jeffrey F Morris
- The City College of New York, The Benjamin Levich Institute, New York, New York 10031, United States
- Department of Chemical Engineering, The City College of New York, New York, New York 10031, United States
| | - Mark D Shattuck
- The City University of New York Graduate Center, Department of Physics, New York, New York 10016-4309, United States
- The City College of New York, The Benjamin Levich Institute, New York, New York 10031, United States
- Department of Physics, The City College of New York, New York, New York 10031, United States
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6
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Advances in the Fabrication and Characterization of Superhydrophobic Surfaces Inspired by the Lotus Leaf. Biomimetics (Basel) 2022; 7:biomimetics7040196. [PMID: 36412724 PMCID: PMC9680393 DOI: 10.3390/biomimetics7040196] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/28/2022] [Accepted: 11/02/2022] [Indexed: 11/12/2022] Open
Abstract
Nature has proven to be a valuable resource in inspiring the development of novel technologies. The field of biomimetics emerged centuries ago as scientists sought to understand the fundamental science behind the extraordinary properties of organisms in nature and applied the new science to mimic a desired property using various materials. Through evolution, living organisms have developed specialized surface coatings and chemistries with extraordinary properties such as the superhydrophobicity, which has been exploited to maintain structural integrity and for survival in harsh environments. The Lotus leaf is one of many examples which has inspired the fabrication of superhydrophobic surfaces. In this review, the fundamental science, supported by rigorous derivations from a thermodynamic perspective, is presented to explain the origin of superhydrophobicity. Based on theory, the interplay between surface morphology and chemistry is shown to influence surface wetting properties of materials. Various fabrication techniques to create superhydrophobic surfaces are also presented along with the corresponding advantages and/or disadvantages. Recent advances in the characterization techniques used to quantify the superhydrophobicity of surfaces is presented with respect to accuracy and sensitivity of the measurements. Challenges associated with the fabrication and characterization of superhydrophobic surfaces are also discussed.
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7
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Tkachuk N, Zelena L. Inhibition of heterotrophic bacterial biofilm in the soil ferrosphere by Streptomyces spp. and Bacillus velezensis. BIOFOULING 2022; 38:916-925. [PMID: 36440643 DOI: 10.1080/08927014.2022.2151362] [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: 06/06/2022] [Revised: 11/14/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
The soil microbiome is involved in the processes of microbial corrosion, in particular, by the formation of biofilm. It has been proposed that an environmentally friendly solution to this corrosion might be through biological control. Bacillus velezensis NUChC C2b, Streptomyces gardneri ChNPU F3 and S. canus NUChC F2 were investigated as potentially 'green' biocides to prevent attachment to glass as a model surface and the formation of heterotrophic bacterial biofilm which participates in the corrosion process. Results showed high antagonistic and antibiofilm properties of S. gardneri ChNPU F3; which may be related to the formation of secondary antimicrobial metabolites by this strain. B. velezensis NUChC C2b and S. gardneri ChNPU F3 could be incorporated into green biocides - as components of antibiofilm agents that will protect material from bacterial corrosion or as agents that will prevent historical heritage damage.
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Affiliation(s)
- Nataliia Tkachuk
- Department of Biology, T.H. Shevchenko National University "Chernihiv Colehium", Chernihiv, Ukraine
| | - Liubov Zelena
- Department of Physiology of Industrial Microorganisms of the Danylo Zabolotny Institute of Microbiology and Virology, NAS of Ukraine, Kyiv, Ukraine
- Department of Biotechnology, Leather and Fur, Kyiv National University of Technologies and Design, Kyiv, Ukraine
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8
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Valiei A, Lin N, McKay G, Nguyen D, Moraes C, Hill RJ, Tufenkji N. Surface Wettability Is a Key Feature in the Mechano-Bactericidal Activity of Nanopillars. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27564-27574. [PMID: 35670568 DOI: 10.1021/acsami.2c03258] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nanopillar-textured surfaces are of growing interest because of their ability to kill bacteria through physical damage without relying on antimicrobial chemicals. Although research on antibacterial nanopillars has progressed significantly in recent years, the effect of nanopillar hydrophobicity on bactericidal activity remains elusive. In this study, we investigated the mechano-bactericidal efficacy of etched silicon nanopillars against Pseudomonas aeruginosa at nanopillar hydrophobicities from superhydrophilic to superhydrophobic. Assessing cell viability and bacterial morphology in immersed wet conditions, we observed negligible bactericidal activity; however, air/liquid interface displacement during water evaporation established a bactericidal effect that strongly depends on substrate hydrophobicity. Specifically, bactericidal activity was highest on superhydrophilic surfaces but abated with increasing hydrophobicity, diminishing at substrate contact angles larger than 90°. Calculation of the surface tension and Laplace pressure forces during water evaporation for each substrate subsequently highlighted that the total capillary force, as an external driving force responsible for bacterial deformation, is significantly weaker on hydrophobic substrates. These findings suggest that superhydrophilic nanopillared surfaces are a superior choice for mechano-bactericidal activity, whereas superhydrophobic surfaces, although not bactericidal, may have antibiofouling properties through their self-cleaning effect. These findings provide new insights into the design and application of nanopillared surfaces as functional antibacterial materials.
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Affiliation(s)
- Amin Valiei
- Department of Chemical Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
| | - Nicholas Lin
- Department of Chemical Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
| | - Geoffrey McKay
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, Québec H3A 0G4, Canada
| | - Dao Nguyen
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, Québec H3A 0G4, Canada
- Department of Medicine, McGill University, Montreal, Québec H3A 0G4, Canada
| | - Christopher Moraes
- Department of Chemical Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
- Department of Biomedical Engineering, McGill University, Montreal, Québec H3A 2B4, Canada
| | - Reghan J Hill
- Department of Chemical Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
| | - Nathalie Tufenkji
- Department of Chemical Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
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9
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Nagy N. Capillary Bridges on Hydrophobic Surfaces: Analytical Contact Angle Determination. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6201-6208. [PMID: 35523001 PMCID: PMC9118539 DOI: 10.1021/acs.langmuir.2c00674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/28/2022] [Indexed: 06/14/2023]
Abstract
The capillary bridge probe method was introduced previously as a high-accuracy contact angle determination method relying on capillary bridges on hydrophilic and superhydrophilic surfaces [Nagy, N. Langmuir 2019, 35 (15), 5202-5212]. In this work, the behavior of r-ϑ type liquid bridges was studied and the contact angles were determined on hydrophobic surfaces. The equilibrium shape of these liquid bridges often does not contain the neck or haunch region. The unknown neck/haunch radius prevents analytical evaluation of the capillary bridge shape. In this work, the possible incomplete liquid bridge shapes were classified and a novel procedure was developed for the Delaunay's analytical solution-based evaluation of these states. The parameter space of the capillary bridges was visualized and described without using dimensionless variables. As a demonstration, Cyclo Olefin Polymer and PTFE surfaces were investigated, with advancing and receding contact angles determined and compared to the results of sessile drop measurements.
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Coelho RCV, Cordeiro LARG, Gazola RB, Teixeira PIC. Dynamics of two-dimensional liquid bridges. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:205001. [PMID: 35226894 DOI: 10.1088/1361-648x/ac594b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Accepted: 02/28/2022] [Indexed: 06/14/2023]
Abstract
We have simulated the motion of a single vertical, two-dimensional liquid bridge spanning the gap between two flat, horizontal solid substrates of given wettabilities, using a multicomponent pseudopotential lattice Boltzmann method. For this simple geometry, the Young-Laplace equation can be solved (quasi-)analytically to yield the equilibrium bridge shape under gravity, which provides a check on the validity of the numerical method. In steady-state conditions, we calculate the drag force exerted by the moving bridge on the confining substrates as a function of its velocity, for different contact angles and Bond numbers. We also study how the bridge deforms as it moves, as parametrized by the changes in the advancing and receding contact angles at the substrates relative to their equilibrium values. Finally, starting from a bridge within the range of contact angles and Bond numbers in which it can exist at equilibrium, we investigate how fast it must move in order to break up.
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Affiliation(s)
- Rodrigo C V Coelho
- Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Luís A R G Cordeiro
- Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Rodrigo B Gazola
- Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Paulo I C Teixeira
- Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- ISEL-Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal
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11
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Wang CY, Lee BS, Jhang YT, Ma KSK, Huang CP, Fu KL, Lai CH, Tseng WY, Kuo MYP, Chen YW. Er:YAG laser irradiation enhances bacterial and lipopolysaccharide clearance and human gingival fibroblast adhesion on titanium discs. Sci Rep 2021; 11:23954. [PMID: 34907255 PMCID: PMC8671504 DOI: 10.1038/s41598-021-03434-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Accepted: 11/29/2021] [Indexed: 12/12/2022] Open
Abstract
To investigate the effect of Er:YAG laser treatment on lipopolysaccharide (LPS) clearance and fibroblast adhesion on titanium disks. Grade IV titanium discs (n = 216) were used and allocated to 6 groups. Group 1 was the negative control without Porphyromonas gingivalis inoculation. Discs in Groups 2-6 were incubated with P. gingivalis to form a biofilm. Group 3 received 0.12% chlorhexidine irrigation and Group 4 received titanium curettage to remove the biofilm. Group 5 was treated with Er:YAG laser irradiation and Group 6 was treated with titanium curettage plus Er:YAG laser irradiation. The contact angle and surface roughness were measured after the various treatments. The surface microstructure and residual bacteria were examined using scanning electron microscopy and confocal laser scanning microscopy, respectively. Residual LPS was examined using a limulus amoebocyte lysate assay and human gingival fibroblast adhesion was quantified using fluorescent microscopy. Curettage plus Er:YAG laser irradiation was the most effective method for removing bacteria and LPS. No significant difference in the amount of fibroblast adhesion was found between the control and Group 6. Combined use of Er:YAG laser irradiation and curettage optimizes LPS clearance and fibroblast adhesion on titanium discs.
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Affiliation(s)
- Chen-Ying Wang
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Bor-Shiunn Lee
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Ya-Ting Jhang
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1 Chang-Te Street, Taipei, 10048, Taiwan
| | - Kevin Sheng-Kai Ma
- Graduate Institute of Biomedical Electronics and Bioinformatics, College of Electrical Engineering and Computer Science, National Taiwan University, Taipei, Taiwan
| | - Chen-Pang Huang
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1 Chang-Te Street, Taipei, 10048, Taiwan
| | - Kuan-Lun Fu
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1 Chang-Te Street, Taipei, 10048, Taiwan
| | - Chern-Hsiung Lai
- College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Wan-Yu Tseng
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Mark Yen-Ping Kuo
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
- School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Yi-Wen Chen
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan.
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1 Chang-Te Street, Taipei, 10048, Taiwan.
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12
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Frost OG, Owji N, Thorogate R, Kyriakidis C, Sawadkar P, Mordan N, Knowles JC, Lali F, Garcia-Gareta E. Cell morphology as a design parameter in the bioengineering of cell-biomaterial surface interactions. Biomater Sci 2021; 9:8032-8050. [PMID: 34723312 DOI: 10.1039/d1bm01149a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Control of cell-surface interaction is necessary for biomaterial applications such as cell sheets, intelligent cell culture surfaces, or functional coatings. In this paper, we propose the emergent property of cell morphology as a design parameter in the bioengineering of cell-biomaterial surface interactions. Cell morphology measured through various parameters can indicate ideal candidates for these various applications thus reducing the time taken for the screening and development process. The hypothesis of this study is that there is an optimal cell morphology range for enhanced cell proliferation and migration on the surface of biomaterials. To test the hypothesis, primary porcine dermal fibroblasts (PDF, 3 biological replicates) were cultured on ten different surfaces comprising components of the natural extracellular matrix of tissues. Results suggested an optimal morphology with a cell aspect ratio (CAR) between 0.2 and 0.4 for both increased cell proliferation and migration. If the CAR was below 0.2 (very elongated cell), cell proliferation was increased whilst migration was reduced. A CAR of 0.4+ (rounded cell) favoured cell migration over proliferation. The screening process, when it comes to biomaterials is a long, repetitive, arduous but necessary event. This study highlights the beneficial use of testing the cell morphology on prospective prototypes, eliminating those that do not support an optimal cell shape. We believe that the research presented in this paper is important as we can help address this screening inefficiency through the use of the emergent property of cell morphology. Future work involves automating CAR quantification for high throughput screening of prototypes.
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Affiliation(s)
- Oliver G Frost
- Regenerative Biomaterials Group, The RAFT Institute & The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK.
| | - Nazanin Owji
- Regenerative Biomaterials Group, The RAFT Institute & The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK. .,Division of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, UK
| | - Richard Thorogate
- London Centre for Nanotechnology, Faculty of Mathematical and Physical Sciences, University College London, London, UK
| | - Christos Kyriakidis
- Regenerative Biomaterials Group, The RAFT Institute & The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK.
| | - Prasad Sawadkar
- Regenerative Biomaterials Group, The RAFT Institute & The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK. .,Division of Surgery and Interventional Science, University College London, London, UK
| | - Nicola Mordan
- Division of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, UK
| | - Jonathan C Knowles
- Division of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, UK.,UCL Eastman-Korea Dental Medicine Innovation Centre, Dankook University, Cheonan 31116, Korea.,Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Centre for Regenerative Medicine, Dankook University, Cheonan 31116, Korea
| | - Ferdinand Lali
- Division of Surgery and Interventional Science, University College London, London, UK.,The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK
| | - Elena Garcia-Gareta
- Regenerative Biomaterials Group, The RAFT Institute & The Griffin Institute, Northwick Park & Saint Mark's Hospital, London, UK. .,Division of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, UK.,Aragonese Agency for R&D (ARAID) Foundation, Zaragoza, Aragón, Spain
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Teixeira PIC, Teixeira MAC. The shape of two-dimensional liquid bridges. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:034002. [PMID: 31561239 DOI: 10.1088/1361-648x/ab48b7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have studied a single vertical, two-dimensional liquid bridge spanning the gap between two flat, horizontal solid substrates of given wettabilities. For this simple geometry, the Young-Laplace equation can be solved (quasi-)analytically to yield the equilibrium bridge shape under gravity. We establish the range of gap widths (as described by a Bond number [Formula: see text]) for which the liquid bridge can exist, for given contact angles at the top and bottom substrates ([Formula: see text] and [Formula: see text], respectively). In particular, we find that the absolute maximum span of a liquid bridge is four capillary lengths, for [Formula: see text] and [Formula: see text]; whereas for [Formula: see text] and [Formula: see text] no bridge can form, for any substrate separation. We also obtain the minimum value of the cross-sectional area of such a liquid bridge, as well as the conditions for the existence and positions of any necks or bulges and inflection points on its surface. This generalises our earlier work in which the gap was assumed to be spanned by a liquid film of zero thickness connecting two menisci at the bottom and top substrates.
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Affiliation(s)
- Paulo I C Teixeira
- ISEL-Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa Rua Conselheiro Emídio Navarro 1, 1959-007 Lisbon, Portugal. Centro de Física Teórica e Computacional, Faculdade de Ciências da Universidade de Lisboa Campo Grande, Edifício C8, 1749-016 Lisbon, Portugal
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14
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Albert E, Tegze B, Hajnal Z, Zámbó D, Szekrényes DP, Deák A, Hórvölgyi Z, Nagy N. Robust Contact Angle Determination for Needle-in-Drop Type Measurements. ACS OMEGA 2019; 4:18465-18471. [PMID: 31720550 PMCID: PMC6844089 DOI: 10.1021/acsomega.9b02990] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
One of the main approaches for contact angle determination using sessile drops with a missing apex (e.g., because of the presence of the needle tip) is the polynomial drop-profile fitting method. The major disadvantage of this fitting procedure is that the derived contact angle is highly sensitive to the polynomial order and the number of pixels involved in the actual fit. In the present work, an easily implementable method is introduced to effectively tackle these drawbacks. Instead of fitting the drop-profile itself, the polynomial fitting is applied to the difference between the drop profile and the circumcircle, independently for both sides of the drop. The derivative value of this difference at the contact point is used to correct the slope obtained analytically from the circumcircle. It is shown that this approach allows the robust determination of the contact angle with high (≤0.6°) accuracy in a straightforward manner, and the results are not affected by the actual contact angle, drop volume, or the resolution of the captured image. Validation of this new approach is also given in the contact angle range of 20°-150° by comparing the results to the values calculated by the Young-Laplace fit.
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Affiliation(s)
- Emőke Albert
- Department
of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Borbála Tegze
- Department
of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Zoltán Hajnal
- Institute
of Technical Physics and Materials Science, Centre for Energy Research, P.O. Box
49, H-1525 Budapest, Hungary
| | - Dániel Zámbó
- Institute
of Technical Physics and Materials Science, Centre for Energy Research, P.O. Box
49, H-1525 Budapest, Hungary
| | - Dániel P. Szekrényes
- Institute
of Technical Physics and Materials Science, Centre for Energy Research, P.O. Box
49, H-1525 Budapest, Hungary
| | - András Deák
- Institute
of Technical Physics and Materials Science, Centre for Energy Research, P.O. Box
49, H-1525 Budapest, Hungary
| | - Zoltán Hórvölgyi
- Department
of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Norbert Nagy
- Institute
of Technical Physics and Materials Science, Centre for Energy Research, P.O. Box
49, H-1525 Budapest, Hungary
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