1
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Bernero M, Zauchner D, Müller R, Qin XH. Interpenetrating network hydrogels for studying the role of matrix viscoelasticity in 3D osteocyte morphogenesis. Biomater Sci 2024; 12:919-932. [PMID: 38231154 PMCID: PMC10863643 DOI: 10.1039/d3bm01781h] [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: 10/31/2023] [Accepted: 01/08/2024] [Indexed: 01/18/2024]
Abstract
During bone formation, osteoblasts are embedded in a collagen-rich osteoid tissue and differentiate into an extensive 3D osteocyte network throughout the mineralizing matrix. However, how these cells dynamically remodel the matrix and undergo 3D morphogenesis remains poorly understood. Although previous reports investigated the impact of matrix stiffness in osteocyte morphogenesis, the role of matrix viscoelasticity is often overlooked. Here, we report a viscoelastic alginate-collagen interpenetrating network (IPN) hydrogel for 3D culture of murine osteocyte-like IDG-SW3 cells. The IPN hydrogels consist of an ionically crosslinked alginate network to tune stress relaxation as well as a permissive collagen network to promote cell adhesion and matrix remodeling. Two IPN hydrogels were developed with comparable stiffnesses (4.4-4.7 kPa) but varying stress relaxation times (t1/2, 1.5 s and 14.4 s). IDG-SW3 cells were pre-differentiated in 2D under osteogenic conditions for 14 days to drive osteoblast-to-osteocyte transition. Cellular mechanosensitivity to fluid shear stress (2 Pa) was confirmed by live-cell calcium imaging. After embedding in the IPN hydrogels, cells remained highly viable following 7 days of 3D culture. After 24 h, osteocytes in the fast-relaxing hydrogels showed the largest cell area and long dendritic processes. However, a significantly larger increase of some osteogenic markers (ALP, Dmp1, hydroxyapatite) as well as intercellular connections via gap junctions were observed in slow-relaxing hydrogels on day 14. Our results imply that fast-relaxing IPN hydrogels promote early cell spreading, whereas slow relaxation favors osteogenic differentiation. These findings may advance the development of 3D in vivo-like osteocyte models to better understand bone mechanobiology.
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Affiliation(s)
| | | | - Ralph Müller
- Institute for Biomechanics, ETH Zürich, Switzerland.
| | - Xiao-Hua Qin
- Institute for Biomechanics, ETH Zürich, Switzerland.
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2
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Guennec A, Balnois E, Augias A, Bangoura MA, Jaffry C, Simon-Colin C, Langlois V, Azemar F, Vignaud G, Linossier I, Faÿ F, Vallée-Réhel K. Investigating the anti-bioadhesion properties of short, medium chain length, and amphiphilic polyhydroxyalkanoate films. BIOFOULING 2024; 40:177-192. [PMID: 38465991 DOI: 10.1080/08927014.2024.2326038] [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: 09/12/2023] [Accepted: 02/22/2024] [Indexed: 03/12/2024]
Abstract
Silicone materials are widely used in fouling release coatings, but developing eco-friendly protection via biosourced coatings, such as polyhydroxyalcanoates (PHA) presents a major challenge. Anti-bioadhesion properties of medium chain length PHA and short chain length PHA films are studied and compared with a reference Polydimethylsiloxane coating. The results highlight the best capability of the soft and low-roughness PHA-mcl films to resist bacteria or diatoms adsorption as compared to neat PDMS and PHBHV coatings. These parameters are insufficient to explain all the results and other properties related to PHA crystallinity are discussed. Moreover, the addition of a low amount of PEG copolymers within the coatings, to create amphiphilic coatings, boosts their anti-adhesive properties. This work reveals the importance of the physical or chemical ambiguity of surfaces in their anti-adhesive effectiveness and highlights the potential of PHA-mcl film to resist the primary adhesion of microorganisms.
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Affiliation(s)
- Alexandra Guennec
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Eric Balnois
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université de Brest, Quimper, France
| | - Antoine Augias
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Mama Aïssata Bangoura
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Cédric Jaffry
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
- Institut de Recherche Dupuy de Lôme (IRDL), Université Bretagne Sud, UMR CNRS 6027, Lorient, France
| | - Christelle Simon-Colin
- Laboratoire de Microbiologie des Environnements Extrêmes (LM2E), Université de Brest, IFREMER, CNRS, UMR BEEP 6197, Plouzané, France
| | - Valérie Langlois
- Institut de Chimie et des Matériaux Paris-Est (ICPME), Université Paris Est Créteil, UMR-CNRS 7182, Thiais, France
| | - Fabrice Azemar
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Guillaume Vignaud
- Institut de Recherche Dupuy de Lôme (IRDL), Université Bretagne Sud, UMR CNRS 6027, Lorient, France
| | - Isabelle Linossier
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Fabienne Faÿ
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
| | - Karine Vallée-Réhel
- Laboratoire de Biotechnologie et de Chimie Marines (LBCM), EMR CNRS 6076, Université Bretagne Sud, Lorient, France
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3
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Barajas B, Kurtz IS, Waldman AJ, Schiffman JD. Stiffness and Oligomer Content Affect the Initial Adhesion of Staphylococcus aureus to Polydimethylsiloxane Gels. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37922414 DOI: 10.1021/acsami.3c11349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
The growing prevalence of methicillin-resistant Staphylococcus aureus (S. aureus) infections necessitates a greater understanding of their initial adhesion to medically relevant surfaces. In this study, the influence of the mechanical properties and oligomer content of polydimethylsiloxane (PDMS) gels on the initial attachment of Gram-positive S. aureus was explored. Small-amplitude oscillatory shear rheological measurements were conducted to verify that by altering the base to curing (B:C) ratio of the commonly used Sylgard 184 silicone elastomer kit (B:C ratios of 60:1, 40:1, 10:1, and 5:1), PDMS gels could be synthesized with Young's moduli across four distinct regimes: ultrasoft (15 kPa), soft (30 kPa), standard (400 kPa), and stiff (1500 kPa). These as-prepared gels (unextracted) were compared to gels prepared from the same B/C ratios that underwent Soxhlet extraction to remove any unreacted oligomers. While the Young's moduli of unextracted and extracted PDMS gels prepared from the same B:C ratio were statistically equivalent, the associated adhesion failure energy statistically decreased for the ultrasoft gels after extraction (from 25 to 8 J/mm2). The interactions of these eight well-characterized gels with bacteria were tested by using S. aureus SH1000, a commonly studied laboratory strain, as well as S. aureus ATCC 12600, which was isolated from a human lung infection. Increased S. aureus inactivation occurred only when the bacteria were incubated directly on top of the unextracted gels prepared at high B:C ratios (40:1 and 60:1), whereas none of the extracted gels (no unreacted oligomers) had significant levels of inactivated bacteria. S. aureus adhered the least to the stiffest extracted PDMS gels (no unreacted oligomers) and the most to soft, unextracted PDMS gels (with ∼17% unreacted oligomers). These findings suggest that both unreacted oligomers and Young's moduli are important material factors to consider when exploring the attachment behavior of Gram-positive S. aureus to hydrophobic elastomer gels.
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Affiliation(s)
- Brandon Barajas
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Irene S Kurtz
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Abraham J Waldman
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Jessica D Schiffman
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
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4
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Tian M, Mu X, Fan D, Liu Z, Liu Q, Yue K, Song Z, Luo J, Zhang S. A Transformable Mucoadhesive Microgel Network for Noninvasive Multimodal Imaging And Radioprotection of a Large Area of the Gastrointestinal Tract. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303436. [PMID: 37364891 DOI: 10.1002/adma.202303436] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 06/04/2023] [Indexed: 06/28/2023]
Abstract
The lack of noninvasive imaging and modulation of a large area of the gastrointestinal (GI) tract constrain the diagnosis and treatment of many GI-related diseases. Recent advances use novel mucoadhesive materials to coat a part of the GI tract and then modulate its functions. High mucoadhesion is the key factor of the partial coating, but also the limitation for not spreading and covering the lower GI tract. Here, a bismuth-pectin organic-inorganic hybrid complex is screened and engineered into a transformable microgel network (Bi-GLUE) with high flowability and mucoadhesion, such that it can quickly transit through and coat a large area of the GI tract. In murine and porcine models, Bi-GLUE delivers contrast agents to achieve real-time, large-area GI-tract imaging under X-ray or magnetic resonance modalities and to facilitate the non-invasive diagnosis of familial adenomatous polyposis. Moreover, Bi-GLUE, like an intracorporal radiation shield, decreases the radiotoxicity in a whole-abdomen irradiation rat model. This transformable microgel network offers a new direction that can modulate a large area of the GI tract and may have broad applications for GI-related conditions.
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Affiliation(s)
- Meng Tian
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Xin Mu
- Advanced Therapies, Siemens Healthineers Ltd., Shanghai, 200126, China
- School of Biomedical Engineering, ShanghaiTech University, Shanghai, 201210, China
| | - Dongyue Fan
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
- Einthoven Laboratory for Vascular and Regenerative Medicine, Division of Thrombosis and Hemostasis, Department of Internal Medicine, Leiden University Medical Center, Leiden, 2333 ZA, Netherlands
| | - Zhen Liu
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Qi Liu
- South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, 510640, China
| | - Kan Yue
- South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, 510640, China
| | - Zhiling Song
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Jie Luo
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Shiyi Zhang
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
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5
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Sun J, Wang K, Hao R, Zhang Z, Feng Z, Shi Z, Yuan W, Jing Z, Zhang L. Disregarded Free Chains Affect Bacterial Adhesion on Cross-Linked Polydimethylsiloxane Surfaces. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37466242 DOI: 10.1021/acsami.3c05477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
The surface properties exhibited by chemically cross-linked polydimethylsiloxanes (CPDMS) such as morphology, stiffness, and wettability have garnered great interest in the study of bacteria-material interactions. Nevertheless, the hidden factor of uncross-linked free PDMS chains that dissociate in CPDMS has often been overlooked when studying the biofilm formation on these polymeric elastomer surfaces. Here, we undertake a comparative characterization of the effects of free chains in CPDMS on bacterial adhesion to both flat and textured Sharklet CPDMS surfaces. Surprisingly, compared to unextracted surfaces, removing free chains from flat and textured CPDMS through solvent extraction results in a tremendous increase in bacterial colony-forming units for both Gram-negative and Gram-positive bacteria up to 2-3 orders in the initial adhesion stage of 2 h. These findings demonstrate that the solvent extraction of free chains from CPDMS is essential in studying the interactions between bacteria and silicone elastomer materials when focusing on a single variable.
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Affiliation(s)
- Jining Sun
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
- State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China
| | - Kunwen Wang
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Ruonan Hao
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zhiyuan Zhang
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zhongyu Feng
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zhenqiang Shi
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Wenjie Yuan
- School of Bioengineering, Dalian University of Technology, Dalian 116024, China
| | - Zhanyu Jing
- School of Bioengineering, Dalian University of Technology, Dalian 116024, China
| | - Lei Zhang
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
- State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China
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6
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Yuan L, Straub H, Shishaeva L, Ren Q. Microfluidics for Biofilm Studies. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2023; 16:139-159. [PMID: 37314876 DOI: 10.1146/annurev-anchem-091522-103827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Biofilms are multicellular communities held together by a self-produced extracellular matrix and exhibit a set of properties that distinguish them from free-living bacteria. Biofilms are exposed to a variety of mechanical and chemical cues resulting from fluid motion and mass transport. Microfluidics provides the precise control of hydrodynamic and physicochemical microenvironments to study biofilms in general. In this review, we summarize the recent progress made in microfluidics-based biofilm research, including understanding the mechanism of bacterial adhesion and biofilm development, assessment of antifouling and antimicrobial properties, development of advanced in vitro infection models, and advancement in methods to characterize biofilms. Finally, we provide a perspective on the future direction of microfluidics-assisted biofilm research.
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Affiliation(s)
- Lu Yuan
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, China;
| | - Hervé Straub
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland;
| | - Liubov Shishaeva
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland;
| | - Qun Ren
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland;
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7
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Priyadarshani J, Awasthi P, Das S, Chakraborty S. Thermally-modulated shape transition at the interface of soft gel filament and hydrophobic substrate. J Colloid Interface Sci 2023; 640:246-260. [PMID: 36863181 DOI: 10.1016/j.jcis.2023.02.089] [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: 12/13/2022] [Revised: 02/08/2023] [Accepted: 02/15/2023] [Indexed: 02/21/2023]
Abstract
A liquid filament may pinch off into different shapes on interacting with a soft surface, as modulated by the interplay of inertial, capillary, and viscous forces. While similar shape transitions may intuitively be realized for more complex materials such as soft gel filaments as well, their intricate controllability towards deriving precise and stable morphological features remains challenging, as attributed to the complexities stemming from the underlying interfacial interactions over the relevant length and time scales during the sol-gel transition process. Circumventing these deficits in the reported literature, here we report a new means of precisely-controlled fabrication of gel microbeads via exploiting thermally-modulated instabilities of a soft filament atop a hydrophobic substrate. Our experiments reveal that abrupt morphological transitions of the gel material set in at a threshold temperature, resulting in spontaneous capillary thinning and filament breakup. We show that this phenomenon may be precisely modulated by an alteration in the hydration state of the gel material that may be preferentially dictated by its intrinsic glycerol content. Our results demonstrate that the consequent morphological transitions give rise to topologically-selective microbeads as an exclusive signature of the interfacial interactions of the gel material with the deformable hydrophobic interface underneath. Thus, intricate control may be imposed on the spatio-temporal evolution of the deforming gel, facilitating the inception of highly ordered structures of specific shapes and dimensionalities on demand. This is likely to advance the strategies of long shelf-life analytical biomaterial encapsulations via realizing one-step physical immobilization of bio-analytes on the bead surfaces as a new route to controlled materials processing, without demanding any resourced microfabrication facility or delicate consumable materials.
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Affiliation(s)
- Jyotsana Priyadarshani
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India; Department of Mechanical Engineering, KU Leuven, Leuven 3001, Belgium
| | - Prasoon Awasthi
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Soumen Das
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Suman Chakraborty
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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8
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Selim MS, Fatthallah NA, Shenashen MA, Higazy SA, Madian HR, Selim MM, El-Safty SA. Bioinspired Graphene Oxide-Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2333-2346. [PMID: 36719844 DOI: 10.1021/acs.langmuir.2c03061] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Antifouling (AF) nanocoatings made of polydimethylsiloxane (PDMS) are more cost-efficient and eco-friendly substitutes for the already outlawed tributyltin-based coatings. Here, a catalytic hydrosilation approach was used to construct a design inspired by composite mosquito eyes from non-toxic PDMS nanocomposites filled with graphene oxide (GO) nanosheets decorated with magnetite nanospheres (GO-Fe3O4 nanospheres). Various GO-Fe3O4 hybrid nanofillers were dispersed into the PDMS resin through a solution casting method to evaluate the structure-property relationship. A simple coprecipitation procedure was used to fabricate magnetite nanospheres with an average diameter of 30-50 nm, a single crystal structure, and a predominant (311) lattice plane. The uniform bioinspired superhydrophobic PDMS/GO-Fe3O4 nanocomposite surface produced had a micro-/nano-roughness, low surface-free energy (SFE), and high fouling release (FR) efficiency. It exhibited several advantages including simplicity, ease of large-area fabrication, and a simultaneous offering of dual micro-/nano-scale structures simply via a one-step solution casting process for a wide variety of materials. The superhydrophobicity, SFE, and rough topology have been studied as surface properties of the unfilled silicone and the bioinspired PDMS/GO-Fe3O4 nanocomposites. The coatings' physical, mechanical, and anticorrosive features were also taken into account. Several microorganisms were employed to examine the fouling resistance of the coated specimens for 1 month. Good dispersion of GO-Fe3O4 hybrid fillers in the PDMS coating until 1 wt % achieved the highest water contact angle (158° ± 2°), the lowest SFE (12.06 mN/m), micro-/nano-roughness, and improved bulk mechanical and anticorrosion properties. The well-distributed PDMS/GO-Fe3O4 (1 wt % nanofillers) bioinspired nanocoating showed the least biodegradability against all the tested microorganisms [Kocuria rhizophila (2.047%), Pseudomonas aeruginosa (1.961%), and Candida albicans (1.924%)]. We successfully developed non-toxic, low-cost, and economical nanostructured superhydrophobic FR composite coatings for long-term ship hull coatings. This study may expand the applications of bio-inspired functional materials because for multiple AF, durability and hydrophobicity are both important features in several industrial applications.
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Affiliation(s)
- Mohamed S Selim
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Nesreen A Fatthallah
- Processes Design & Development Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Mohamed A Shenashen
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken305-0047, Japan
| | - Shimaa A Higazy
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Hekmat R Madian
- Processes Design & Development Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Mahmoud M Selim
- Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj11942, Saudi Arabia
| | - Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken305-0047, Japan
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9
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Straub H, Zuber F, Eberl L, Maniura-Weber K, Ren Q. In Situ Investigation of Pseudomonas aeruginosa Biofilm Development: Interplay between Flow, Growth Medium, and Mechanical Properties of Substrate. ACS APPLIED MATERIALS & INTERFACES 2023; 15:2781-2791. [PMID: 36601891 DOI: 10.1021/acsami.2c20693] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
To better understand the impact of biomaterial mechanical properties and growth medium on bacterial adhesion and biofilm formation under flow, we investigated the biofilm formation ability of Pseudomonas aeruginosa in different media on polydimethylsiloxane (PDMS) of different stiffness in real time using a microfluidic platform. P. aeruginosa colonization was recorded with optical microscopy and automated image analysis. The bacterial intracellular level of cyclic diguanylate (c-di-GMP), which regulates biofilm formation, was monitored using the transcription of the putative adhesin gene (cdrA) as a proxy. Contrary to the previous supposition, we revealed that PDMS material stiffness within the tested range has negligible impact on biofilm development and biofilm structures, whereas culture media not only influence the kinetics of biofilm development but also affect the biofilm morphology and structure dramatically. Interestingly, magnesium rather than previously reported calcium was identified here to play a decisive role in the formation of dense P. aeruginosa aggregates and high levels of c-di-GMP. These results demonstrate that although short-term adhesion assays bring valuable insight into bacterial and material interactions, long-term evaluations are essential to better predict overall biofilm outcome. The microfluidic system developed here presents a valuable application potential for studying biofilm development in situ. .
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Affiliation(s)
- Hervé Straub
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen CH-9014, Switzerland
- Department of Plant and Microbial Biology, University of Zürich, Zürich CH-8008, Switzerland
| | - Flavia Zuber
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen CH-9014, Switzerland
| | - Leo Eberl
- Department of Plant and Microbial Biology, University of Zürich, Zürich CH-8008, Switzerland
| | - Katharina Maniura-Weber
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen CH-9014, Switzerland
| | - Qun Ren
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen CH-9014, Switzerland
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10
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Wang J, Li P, Wang N, Wang J, Xing D. Antibacterial features of material surface: strong enough to serve as antibiotics? J Mater Chem B 2023; 11:280-302. [PMID: 36533438 DOI: 10.1039/d2tb02139k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Bacteria are small but need big efforts to control. The use of antibiotics not only produces superbugs that are increasingly difficult to inactivate, but also raises environmental concerns with the growing consumption. It is now believed that the antibacterial task can count on some physiochemical features of material surfaces, which can be anti-adhesive or bactericidal without releasing toxicants. It is necessary to evaluate to what extent can we rely on the surface design since the actual application scenarios will need the antibacterial performance to be sharp, robust, environmentally friendly, and long-lasting. Herein, we review the recent laboratory advances that have been classified based on the specific surface features, including hydrophobicity, charge potential, micromorphology, stiffness and viscosity, and photoactivity, and the antibacterial mechanisms of each feature are included to provide a basic rationale for future design. The significance of anti-biofilms is also introduced, given the big role of biofilms in bacteria-caused damage. A perspective on the potential wide application of antibacterial surface features as a substitute or supplement to antibiotics is then discussed. Surface design is no doubt a solution worthy to explore, and future success will be a result of further progress in multiple directions, including mechanism study and material preparation.
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Affiliation(s)
- Jie Wang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao 266071, China. .,CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, China Academy of Sciences, Qingdao 266071, China.
| | - Ping Li
- School of Rehabilitation Sciences and Engineering, University of Health and Rehabilitation Sciences, Qingdao 266071, China
| | - Ning Wang
- CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, China Academy of Sciences, Qingdao 266071, China.
| | - Jing Wang
- CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, China Academy of Sciences, Qingdao 266071, China.
| | - Dongming Xing
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao 266071, China.
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11
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Campolo A, Pifer R, Shannon P, Crary M. Microbial Adherence to Contact Lenses and Pseudomonas aeruginosa as a Model Organism for Microbial Keratitis. Pathogens 2022; 11:1383. [PMID: 36422634 PMCID: PMC9695309 DOI: 10.3390/pathogens11111383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/11/2022] [Accepted: 11/17/2022] [Indexed: 08/27/2023] Open
Abstract
Microbial keratitis (MK), the infection of the cornea, is a devastating disease and the fifth leading cause of blindness and visual impairment around the world. The overwhelming majority of MK cases are linked to contact lens wear combined with factors which promote infection such as corneal abrasion, an immunocompromised state, improper contact lens use, or failing to routinely disinfect lenses after wear. Contact lens-related MK involves the adherence of microorganisms to the contact lens. Therefore, this review discusses the information currently available regarding the disease pathophysiology, the common types of microorganisms causing MK, physical and organic mechanisms of adhesion, material properties which are involved in adhesion, and current antimicrobial strategies. This review also concludes that Pseudomonas aeruginosa is a model organism for the investigation of contact lens microbial adherence due to its prevalence in MK cases, its extremely robust adhesion, antimicrobial-resistant properties, and the severity of the disease it causes.
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12
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Vigué A, Vautier D, Kaytoue A, Senger B, Arntz Y, Ball V, Ben Mlouka A, Gribova V, Hajjar-Garreau S, Hardouin J, Jouenne T, Lavalle P, Ploux L. Escherichia coli Biofilm Formation, Motion and Protein Patterns on Hyaluronic Acid and Polydimethylsiloxane Depend on Surface Stiffness. J Funct Biomater 2022; 13:jfb13040237. [PMID: 36412878 PMCID: PMC9680287 DOI: 10.3390/jfb13040237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/05/2022] [Accepted: 11/08/2022] [Indexed: 11/16/2022] Open
Abstract
The surface stiffness of the microenvironment is a mechanical signal regulating biofilm growth without the risks associated with the use of bioactive agents. However, the mechanisms determining the expansion or prevention of biofilm growth on soft and stiff substrates are largely unknown. To answer this question, we used PDMS (polydimethylsiloxane, 9-574 kPa) and HA (hyaluronic acid gels, 44 Pa-2 kPa) differing in their hydration. We showed that the softest HA inhibited Escherichia coli biofilm growth, while the stiffest PDMS activated it. The bacterial mechanical environment significantly regulated the MscS mechanosensitive channel in higher abundance on the least colonized HA-44Pa, while Type-1 pili (FimA) showed regulation in higher abundance on the most colonized PDMS-9kPa. Type-1 pili regulated the free motion (the capacity of bacteria to move far from their initial position) necessary for biofilm growth independent of the substrate surface stiffness. In contrast, the total length travelled by the bacteria (diffusion coefficient) varied positively with the surface stiffness but not with the biofilm growth. The softest, hydrated HA, the least colonized surface, revealed the least diffusive and the least free-moving bacteria. Finally, this shows that customizing the surface elasticity and hydration, together, is an efficient means of affecting the bacteria's mobility and attachment to the surface and thus designing biomedical surfaces to prevent biofilm growth.
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Affiliation(s)
- Annabelle Vigué
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Dominique Vautier
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Amad Kaytoue
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Bernard Senger
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Youri Arntz
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Vincent Ball
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Amine Ben Mlouka
- PISSARO Proteomic Facility, IRIB, 76130 Mont-Saint-Aignan, France
| | - Varvara Gribova
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Samar Hajjar-Garreau
- Mulhouse Materials Science Institute, CNRS/Haute Alsace University, 68057 Mulhouse, France
| | - Julie Hardouin
- PISSARO Proteomic Facility, IRIB, 76130 Mont-Saint-Aignan, France
- Polymers, Biopolymers, Surfaces Laboratory, CNRS/UNIROUEN/INSA Rouen, Normandie University, 76821 Rouen, France
| | - Thierry Jouenne
- PISSARO Proteomic Facility, IRIB, 76130 Mont-Saint-Aignan, France
- Polymers, Biopolymers, Surfaces Laboratory, CNRS/UNIROUEN/INSA Rouen, Normandie University, 76821 Rouen, France
| | - Philippe Lavalle
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
| | - Lydie Ploux
- INSERM UMR-S 1121 Biomaterial Bioengineering, Centre de Recherche en Biomédecine de Strasbourg, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 67000 Strasbourg, France
- CNRS, 67037 Strasbourg, France
- Correspondence:
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13
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Ceragenin CSA-13 displays high antibacterial efficiency in a mouse model of urinary tract infection. Sci Rep 2022; 12:19164. [PMID: 36357517 PMCID: PMC9649698 DOI: 10.1038/s41598-022-23281-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 10/21/2022] [Indexed: 11/11/2022] Open
Abstract
Ceragenins (CSAs) are synthetic, lipid-based molecules that display activities of natural antimicrobial peptides. Previous studies demonstrated their high in vitro activity against pathogens causing urinary tract infections (UTIs), but their efficiency in vivo was not explored to date. In this study, we aimed to investigate the bactericidal efficiency of ceragenins against E. coli (Xen14 and clinical UPEC strains) isolates both in vitro and in vivo, as well to explore CSA-13 biodistribution and ability to modulate nanomechanical alterations of infected tissues using animal model of UTI. CSA-44, CSA-131 and particularly CSA-13 displayed potent bactericidal effect against tested E. coli strains, and this effect was mediated by induction of oxidative stress. Biodistribution studies indicated that CSA-13 accumulates in kidneys and liver and is eliminated with urine and bile acid. We also observed that ceragenin CSA-13 reverses infection-induced alterations in mechanical properties of mouse bladders tissue, which confirms the preventive role of CSA-13 against bacteria-induced tissue damage and potentially promote the restoration of microenvironment with biophysical features unfavorable for bacterial growth and spreading. These data justify the further work on employment of CSA-13 in the treatment of urinary tract infections.
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14
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Drebezghova V, Hakil F, Grimaud R, Gojzewski H, Vancso GJ, Nardin C. Initial bacterial retention on polydimethylsiloxane of various stiffnesses: The relevance of modulus (mis)match. Colloids Surf B Biointerfaces 2022. [DOI: 10.1016/j.colsurfb.2022.112709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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15
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Santore MM. Interplay of physico-chemical and mechanical bacteria-surface interactions with transport processes controls early biofilm growth: A review. Adv Colloid Interface Sci 2022; 304:102665. [PMID: 35468355 DOI: 10.1016/j.cis.2022.102665] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 04/03/2022] [Accepted: 04/04/2022] [Indexed: 11/01/2022]
Abstract
Biofilms initiate when bacteria encounter and are retained on surfaces. The surface orchestrates biofilm growth through direct physico-chemical and mechanical interactions with different structures on bacterial cells and, in turn, through its influence on cell-cell interactions. Individual cells respond directly to a surface through mechanical or chemical means, initiating "surface sensing" pathways that regulate gene expression, for instance producing extra cellular matrix or altering phenotypes. The surface can also physically direct the evolving colony morphology as cells divide and grow. In either case, the physico-chemistry of the surface influences cells and cell communities through mechanisms that involve additional factors. For instance the numbers of cells arriving on a surface from solution relative to the generation of new cells by division depends on adhesion and transport kinetics, affecting early colony density and composition. Separately, the forces experienced by adhering cells depend on hydrodynamics, gravity, and the relative stiffnesses and viscoelasticity of the cells and substrate materials, affecting mechanosensing pathways. Physical chemistry and surface functionality, along with interfacial mechanics also influence cell-surface friction and control colony morphology, in particular 2D and 3D shape. This review focuses on the current understanding of the mechanisms in which physico-chemical interactions, deriving from surface functionality, impact individual cells and cell community behavior through their coupling with other interfacial processes.
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16
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Pan F, Liu M, Altenried S, Lei M, Yang J, Straub H, Schmahl WW, Maniura-Weber K, Guillaume-Gentil O, Ren Q. Uncoupling bacterial attachment on and detachment from polydimethylsiloxane surfaces through empirical and simulation studies. J Colloid Interface Sci 2022; 622:419-430. [PMID: 35525145 DOI: 10.1016/j.jcis.2022.04.084] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/10/2022] [Accepted: 04/13/2022] [Indexed: 10/18/2022]
Abstract
Bacterial infections related to medical devices can cause severe problems, whose solution requires in-depth understanding of the interactions between bacteria and surfaces. This work investigates the influence of surface physicochemistry on bacterial attachment and detachment under flow through both empirical and simulation studies. We employed polydimethylsiloxane (PDMS) substrates having different degrees of crosslinking as the model material and the extended Derjaguin - Landau - Verwey - Overbeek model as the simulation method. Experimentally, the different PDMS materials led to similar numbers of attached bacteria, which can be rationalized by the identical energy barriers simulated between bacteria and the different materials. However, different numbers of residual bacteria after detachment were observed, which was suggested by simulation that the detachment process is determined by the interfacial physicochemistry rather than the mechanical property of a material. This finding is further supported by analyzing the bacteria detachment from PDMS substrates from which non-crosslinked polymer chains had been removed: similar numbers of residual bacteria were found on the extracted PDMS substrates. The knowledge gained in this work can facilitate the projection of bacterial colonization on a given surface.
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Affiliation(s)
- Fei Pan
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Mengdi Liu
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland; Department of Earth- and Environmental Sciences, Ludwig Maximilian University of Munich, Theresienstrasse 41, 80333 Munich, Germany
| | - Stefanie Altenried
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Min Lei
- College of Textiles, Donghua University, North Renmin Road 2999, 201620 Shanghai, China
| | - Jiaxin Yang
- Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, 130022 Changchun, China
| | - Hervé Straub
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Wolfgang W Schmahl
- Department of Earth- and Environmental Sciences, Ludwig Maximilian University of Munich, Theresienstrasse 41, 80333 Munich, Germany
| | - Katharina Maniura-Weber
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Orane Guillaume-Gentil
- Institute of Microbiology, Department of Biology, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland
| | - Qun Ren
- Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.
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17
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Urbańska MA, Kolenderska SM, Rodrigues SA, Thakur SS, Vanholsbeeck F. Broadband-excitation-based mechanical spectroscopy of highly viscous tissue-mimicking phantoms. OPTICS EXPRESS 2022; 30:603-618. [PMID: 35201234 DOI: 10.1364/oe.445259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/01/2021] [Indexed: 06/14/2023]
Abstract
Standard rheometers assess mechanical properties of viscoelastic samples up to 100 Hz, which often hinders the assessment of the local-scale dynamics. We demonstrate that high-frequency analysis can be achieved by inducing broadband waves and monitoring their media-dependent propagation using optical coherence tomography. Here, we present a new broadband wave analysis based on two-dimensional Fourier transformation. We validated this method by comparing the mechanical parameters to monochromatic excitation and a standard oscillatory test data. Our method allows for high-frequency mechanical spectroscopy, which could be used to investigate the local-scale dynamics of different biological tissues and the influence of diseases on their microstructure.
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18
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Using plasma-mediated covalent functionalization of rhamnolipids on polydimethylsiloxane towards the antimicrobial improvement of catheter surfaces. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 134:112563. [DOI: 10.1016/j.msec.2021.112563] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/18/2021] [Accepted: 11/21/2021] [Indexed: 02/07/2023]
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19
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Selim MS, Fatthallah NA, Higazy SA, Hao Z, Jing Mo P. A comparative study between two novel silicone/graphene-based nanostructured surfaces for maritime antifouling. J Colloid Interface Sci 2021; 606:367-383. [PMID: 34392032 DOI: 10.1016/j.jcis.2021.08.026] [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: 04/27/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 02/07/2023]
Abstract
Two novel superhydrophobic nanocomposite series of polydimethylsiloxane (PDMS) enriched with reduced graphene oxide (RGO) and graphene oxide/boehmite nanorods (GO-γ-AlOOH) nanofillers were synthesized as maritime fouling-release (FR) surfaces. Controlling the nanofillers' structures and distribution in the silicone matrix influenced the self-cleaning and antifouling properties. γ-AlOOH nanorods had a single crystallinity with an average diameter of 10-20 nm and < 200 nm length. A hydrothermal method was used to prepare RGO, while the chemical deposition method was used to synthesis GO-γ-AlOOH nanocomposites for use as fouling-release coating materials. For studying the synergetic effects of graphene-based materials on the surface, mechanical, and FR features, these nanofillers were dispersed in the silicone matrix using the solution casting method. The hydrophobicity and antifouling properties of the surface were studied using water contact angle (WCA), scanning electron, and atomic force microscopes (SEM and AFM). Coatings' roughness, superhydrophobicity, and surface mechanical properties all improved for the homogeneity of the dispersion of the nanocomposite. Laboratory assessments were carried out for 30 days using selected microorganisms to determine the antifouling effects of the coating systems. PDMS/GO-γ-AlOOH nanorod composite had better antibacterial activity than PDMS/RGO nanocomposite against different bacterial strains. This is caused by the high surface area and stabilizing effects of the GO-γ-AlOOH hybrid nanofillers. The PDMS/GO-γ-AlOOH nanorod composite (3 wt%) had the lowest biodegradability percentage (1.6%) and the microbial endurability percentages for gram-positive, gram-negative, and fungi were 86.42%, 97.94%, and 85.97%, respectively. A field trial in natural seawater was conducted to confirm the coatings' FR performance based on the screening process and image analysis for 45 days in a tropical area. The most profound superhydrophobic antifouling nanostructured coating was the homogeneity of the GO-γ-AlOOH (3 wt%) dispersion, which had a WCA of 151° and a rough surface.
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Affiliation(s)
- Mohamed S Selim
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, PR China; Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City 11727, Cairo, Egypt.
| | | | - Shimaa A Higazy
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City 11727, Cairo, Egypt
| | - Zhifeng Hao
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, PR China.
| | - Ping Jing Mo
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, PR China
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20
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Sahin Kehribar E, Isilak ME, Bozkurt EU, Adamcik J, Mezzenga R, Seker UOS. Engineering of biofilms with a glycosylation circuit for biomaterial applications. Biomater Sci 2021; 9:3650-3661. [PMID: 33710212 DOI: 10.1039/d0bm02192j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Glycosylation is a crucial post-translational modification for a wide range of functionalities. Adhesive protein-based biomaterials in nature rely on heavily glycosylated proteins such as spider silk and mussel adhesive proteins. Engineering protein-based biomaterials genetically enables desired functions and characteristics. Additionally, utilization of glycosylation for biomaterial engineering can expand possibilities by including saccharides to the inventory of building blocks. Here, de novo glycosylation of Bacillus subtilis amyloid-like biofilm protein TasA using a Campylobacter jejuni glycosylation circuit is proposed to be a novel biomaterial engineering method for increasing adhesiveness of TasA fibrils. A C. jejuni glycosylation motif is genetically incorporated to tasA gene and expressed in Escherichia coli containing the C. jejuni pgl protein glycosylation pathway. Glycosylated TasA fibrils indicate enhanced adsorption on the gold surface without disruption of fibril formation. Our findings suggest that N-linked glycosylation can be a promising tool for engineering protein-based biomaterials specifically regarding adhesion.
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Affiliation(s)
- Ebru Sahin Kehribar
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
| | - Musa Efe Isilak
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
| | - Eray Ulas Bozkurt
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
| | - Jozef Adamcik
- ETH Zurich, Department of Health Sciences and Technology, 8092 Zurich, Switzerland and Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Raffaele Mezzenga
- ETH Zurich, Department of Health Sciences and Technology, 8092 Zurich, Switzerland and Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Urartu Ozgur Safak Seker
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
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21
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Khalid S, Gao A, Wang G, Chu PK, Wang H. Tuning surface topographies on biomaterials to control bacterial infection. Biomater Sci 2021; 8:6840-6857. [PMID: 32812537 DOI: 10.1039/d0bm00845a] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Microbial contamination and subsequent formation of biofilms frequently cause failure of surgical implants and a good understanding of the bacteria-surface interactions is vital to the design and safety of biomaterials. In this review, the physical and chemical factors that are involved in the various stages of implant-associated bacterial infection are described. In particular, topographical modification strategies that have been employed to mitigate bacterial adhesion via topographical mechanisms are summarized and discussed comprehensively. Recent advances have improved our understanding about bacteria-surface interactions and have enabled biomedical engineers and researchers to develop better and more effective antibacterial surfaces. The related interdisciplinary efforts are expected to continue in the quest for next-generation medical devices to attain the ultimate goal of improved clinical outcomes and reduced number of revision surgeries.
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Affiliation(s)
- Saud Khalid
- Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
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22
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Wang S, Chen G, Yao B, Chee AJY, Wang Z, Du P, Qu S, Yu ACH. In Situ and Intraoperative Detection of the Ureter Injury Using a Highly Sensitive Piezoresistive Sensor with a Tunable Porous Structure. ACS APPLIED MATERIALS & INTERFACES 2021; 13:21669-21679. [PMID: 33929181 DOI: 10.1021/acsami.0c22791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Iatrogenic ureteral injury, as a commonly encountered problem in gynecologic, colorectal, and pelvic surgeries, is known to be difficult to detect in situ and in real-time. Consequently, this injury may be left untreated, thereby leading to serious complications such as infections, renal failure, or even death. Here, high-performance tubular porous pressure sensors were proposed to identify the ureter in situ intraoperatively. The electrical conductivity, mechanical compressibility, and sensor sensitivity can be tuned by changing the pore structure of porous conductive composites. A low percolation threshold of 0.33 vol % was achieved due to the segregated conductive network by pores. Pores also lead to a low effective Young's modulus and high compressibility of the composites and thus result in a high sensitivity of 448.2 kPa-1 of sensors, which is consistent with the results of COMSOL simulation. Self-mounted on the tip of forceps, the sensors can monitor tube pressures with different frequencies and amplitudes, as demonstrated using an artificial pump system. The sensors can also differentiate ureter pulses from aorta pulses of a Bama minipig in situ and in real-time. This work provides a facile, cost-effective, and nondestructive method to identify the ureter intraoperatively, which cannot be effectively achieved by traditional methods.
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Affiliation(s)
- Shan Wang
- State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Guorui Chen
- State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Bing Yao
- State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Adrian J Y Chee
- Schlegel Research Institute for Aging, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Zongrong Wang
- State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Piyi Du
- State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Shaoxing Qu
- Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Alfred C H Yu
- Schlegel Research Institute for Aging, University of Waterloo, Waterloo N2L 3G1, Canada
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23
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Peng C, Fan X, Xu Y, Ren H, Huang H. Microscopic analysis towards rhamnolipid-mediated adhesion of Thiobacillus denitrificans: A QCM-D study. CHEMOSPHERE 2021; 271:129539. [PMID: 33434821 DOI: 10.1016/j.chemosphere.2021.129539] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/23/2020] [Accepted: 12/31/2020] [Indexed: 06/12/2023]
Abstract
Rhamnolipid was proved to increase the abundance of Thiobacillus denitrificans in the mixotrophic denitrification biofilm while its microscopic mechanism remains to be explored. Effect of rhamnolipids on deposition of macromolecular substances and adhesion of Thiobacillus denitrificans at room (20 °C) and low temperature (10 °C) were systematically investigated by the quartz crystal microbalance with dissipation monitoring (QCM-D) for the first time. Results showed that low concentration of rhamnolipids (20-80 mg/L) could promote the deposition of macromolecular substances by reducing hydraulic repulsion force, with the maximum deposition amount increased by 4.28 times than that of the control at room temperature. Deposition amount of microorganisms could be improved by increasing its concentration at room temperature while it didn't work at low temperature. Meanwhile, low temperature could significantly inhibit adhesion of Thiobacillus denitrificans (p < 0.05) and deposited layers under low concentration of rhamnolipids were generally rigid, resulting in the negative feedback effect on the microorganisms' adhesion. While high concentration of rhamnolipids (120-200 mg/L) could regulate the biofilm from rigid to viscoelastic and significantly promote the initial adhesion of Thiobacillus denitrificans on SiO2 surface (p < 0.05). This study demonstrated the microscopic mechanism of rhamnolipids on the initial biofilm formation, that is, the reduction of hydration repulsion force was responsible for the enhanced deposition of macromolecules while the regulation of biofilm properties was account for the promoted adhesion of Thiobacillus denitrificans.
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Affiliation(s)
- Chong Peng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Xuan Fan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Yujin Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hui Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
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24
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Kim ES, Ha JH, Choi J. Biological fixed-film systems. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:491-501. [PMID: 32866339 DOI: 10.1002/wer.1445] [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: 04/30/2020] [Revised: 08/23/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
The technical papers published in 2019 regarding wastewater treatment and microbial films were classified into two categories: biofilm and biofilm reactors. The biofilm category includes biofilm formation, biofilm consortia, bacterial signals, biofouling, extracellular polymeric substances, and biofilm membrane bioreactors. The biofilm reactors category provides recent information on rotating biological contactors, fluidized-bed biofilm reactors, integrated fixed-film activated sludge, moving-bed biofilm reactors, packed-bed biofilm reactors, sequencing biofilm batch reactors, and trickling filters.
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Affiliation(s)
- Eun-Sik Kim
- Department of Environmental System Engineering, Chonnam National University, Yeosu, Korea
| | - Jae-Hoon Ha
- Department of Environmental Engineering, Korea National University of Transportation, Chungju, Korea
| | - Jeongdong Choi
- Department of Environmental Engineering, Korea National University of Transportation, Chungju, Korea
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25
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A simple magnetic-assisted microfluidic method for rapid detection and phenotypic characterization of ultralow concentrations of bacteria. Talanta 2021; 230:122291. [PMID: 33934763 DOI: 10.1016/j.talanta.2021.122291] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/25/2021] [Accepted: 02/07/2021] [Indexed: 01/11/2023]
Abstract
Isolation and enumeration of bacteria at ultralow concentrations and antibiotic resistance profiling are of great importance for early diagnosis and treatment of bacteremia. In this work, we describe a simple, rapid, and versatile magnetic-assisted microfluidic method for rapid bacterial detection. The developed method enables magnetophoretic loading of bead-captured bacteria into the microfluidic chamber under external static and dynamic magnetic fields in 4 min. A shallow microfluidic chamber design that enables the monolayer orientation and transportation of the beads and a glass substrate with a thickness of 0.17 mm was utilized to allow high-resolution fluorescence imaging for quantitative detection. Escherichia coli (E. coli) with green fluorescent protein (GFP)-expressing gene and streptavidin-modified superparamagnetic microbeads were used as model bacteria and capturing beads, respectively. The specificity of the method was validated using Lactobacillus gasseri as a negative control group. The limit of detection and limit of quantification values were determined as 2 CFU/ml and 10 CFU/ml of E. coli, respectively. The magnetic-assisted microfluidic method is a versatile tool for the detection of ultralow concentrations of viable bacteria with the linear range of 5-5000 CFU/ml E. coli in 1 h, and providing growth curves and phenotypic characterization bead-captured E. coli in the following 5 h of incubation. Our results are promising for future rapid and sensitive antibiotic susceptibility testing of ultralow numbers of viable cells.
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Balakrishnan A, Jena G, Pongachira George R, Philip J. Polydimethylsiloxane-graphene oxide nanocomposite coatings with improved anti-corrosion and anti-biofouling properties. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:7404-7422. [PMID: 33033928 DOI: 10.1007/s11356-020-11068-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
We demonstrate enhanced anti-corrosion and anti-biofouling properties of graphene oxide-silica-polydimethylsiloxane (GSP) coating on carbon steel (CS). Electrochemical analyses of GSP-coated carbon steel exposed to Gram-positive Bacillus sp., Gram-negative Pseudomonas sp., and freshwater bacterial cultures for 72 h showed a 3-5 orders of magnitude reduction in icorr values and high impedance values (107 Ω) as compared with polished specimens. The corrosion protection efficiency of GSP-coated specimens was 99.9% against Bacillus sp. and freshwater culture and it was 89.6% against Pseudomonas sp. Evaluation of anti-biofouling property of GSP coating using microbiological and epifluorescence microscopic techniques showed three order reductions in total viable cells on GSP-coated specimens exposed to bacterial cultures. Confocal laser scanning microscopic analysis of biofilm architecture confirmed a significant reduction of biomass and biofilm thickness on GSP-coated CS demonstrating an excellent anti-biofouling activity of GSP.
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Affiliation(s)
- Anandkumar Balakrishnan
- Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
| | - Geetisubhra Jena
- Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
- Homi Bhabha National Institute, Mumbai, 400094, India
| | - Rani Pongachira George
- Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - John Philip
- Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
- Homi Bhabha National Institute, Mumbai, 400094, India
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27
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Senevirathne SWMAI, Hasan J, Mathew A, Woodruff M, Yarlagadda PKDV. Bactericidal efficiency of micro- and nanostructured surfaces: a critical perspective. RSC Adv 2021; 11:1883-1900. [PMID: 35424086 PMCID: PMC8693530 DOI: 10.1039/d0ra08878a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/12/2020] [Indexed: 12/21/2022] Open
Abstract
Micro/nanostructured surfaces (MNSS) have shown the ability to inactivate bacterial cells by physical means. An enormous amount of research has been conducted in this area over the past decade. Here, we review the various surface factors that affect the bactericidal efficiency. For example, surface hydrophobicity of the substrate has been accepted to be influential on the bactericidal effect of the surface, but a review of the literature suggests that the influence of hydrophobicity differs with the bacterial species. Also, various bacterial viability quantification methods on MNSS are critically reviewed for their suitability for the purpose, and limitations of currently used protocols are discussed. Presently used static bacterial viability assays do not represent the conditions of which those surfaces could be applied. Such application conditions do have overlaying fluid flow, and bacterial behaviours are drastically different under flow conditions compared to under static conditions. Hence, it is proposed that the bactericidal effect should be assessed under relevant fluid flow conditions with factors such as shear stress and flowrate given due significance. This review will provide a range of opportunities for future research in design and engineering of micro/nanostructured surfaces with varying experimental conditions.
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Affiliation(s)
- S W M A I Senevirathne
- Science and Engineering Faculty, Queensland University of Technology (QUT) Brisbane Qld 4000 Australia
- Institute of Health and Biomedical Innovations 60 Musk Ave. Kelvin Grove Qld 4059 Australia
| | - J Hasan
- Science and Engineering Faculty, Queensland University of Technology (QUT) Brisbane Qld 4000 Australia
- Institute of Health and Biomedical Innovations 60 Musk Ave. Kelvin Grove Qld 4059 Australia
| | - A Mathew
- Science and Engineering Faculty, Queensland University of Technology (QUT) Brisbane Qld 4000 Australia
- Institute of Health and Biomedical Innovations 60 Musk Ave. Kelvin Grove Qld 4059 Australia
| | - M Woodruff
- Science and Engineering Faculty, Queensland University of Technology (QUT) Brisbane Qld 4000 Australia
- Institute of Health and Biomedical Innovations 60 Musk Ave. Kelvin Grove Qld 4059 Australia
| | - P K D V Yarlagadda
- Science and Engineering Faculty, Queensland University of Technology (QUT) Brisbane Qld 4000 Australia
- Institute of Health and Biomedical Innovations 60 Musk Ave. Kelvin Grove Qld 4059 Australia
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28
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Vignesh V, Nguyen THH, Vanderwal L, Stafslien S, Brennan A. Tough amphiphilic antifouling coating based on acrylamide, fluoromethacrylate and non-isocyanate urethane dimethacrylate crosslinker. BIOFOULING 2021; 37:36-48. [PMID: 33487051 DOI: 10.1080/08927014.2020.1870110] [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: 10/15/2020] [Accepted: 12/21/2020] [Indexed: 06/12/2023]
Abstract
This study is focused on the development of tougher gels using combinations of acrylamide, fluoromethacrylate and a non-isocyanate urethane dimethacrylate (NIUDMA) crosslinker. The NIUDMA was tailored with 2, 3-epoxypropoxy propyl-polydimethylsiloxane segments E9 (MW = 0.36 kg mol-1), E11 (MW = 0.5-0.6 kg mol-1) and E12 (MW = 1-1.4 kg mol-1). A 3 level Taguchi design was used to evaluate the role of each component of the ternary copolymer gel on the elastic modulus and toughness. The toughness ranged from 2.5-7 MJ m-3 whereas the modulus ranged from 27-70 MPa. The formulations with the highest toughness and modulus were screened for their antifouling potential in biological assays against the microalga Navicula incerta and the bacterium Cellulophaga lytica. The E9 gels showed the best performance, achieving a 73% reduction in N. incerta cells and a 92% reduction in C. lytica biofilm remaining after water jetting treatments, when compared with the commercial Intersleek product IS700.
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Affiliation(s)
- Vishal Vignesh
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Thi Hoang Ha Nguyen
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Lyndsi Vanderwal
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Shane Stafslien
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Anthony Brennan
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
- Margaret A. Ross Professor of Materials Science & Engineering, Affiliate of Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
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29
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Zhu J, Wang M, Zhang H, Yang S, Song KY, Yin R, Zhang W. Effects of Hydrophilicity, Adhesion Work, and Fluid Flow on Biofilm Formation of PDMS in Microfluidic Systems. ACS APPLIED BIO MATERIALS 2020; 3:8386-8394. [PMID: 35019610 DOI: 10.1021/acsabm.0c00660] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polydimethylsiloxane (PDMS) has been the most widely used material in microfluidic systems, especially for cell biology applications. However, the antibacterial performance of PDMS in flow conditions has never been reported in the literature. In this paper, we analyzed the effects of contact angle (CA), adhesion force (work), and surface free energy on the antibacterial activities of PDMS by varying the ratio of curing agents (crosslinking degree) and surface modification with oxygen plasma. The results show that the Young's modulus has no particular effects on bacterial adhesion compared to the CAs of samples. For the first time, we analyzed the adhesion work (AW) effect on biofilm formation, and we found that biofilms tend to form on the surface with less AW. Furthermore, we analyzed the dual effect of hydrophilicity and shear force induced by fluid flow on the bacterial adhesion in PDMS microfluidic systems. We found that at low flow rates in microfluidic conditions, the adhesion of the bacteria on the PDMS surface is inhibited when the fluid flow exceeds a certain value. It required higher shear force to inhibit bacterial adhesion on the hydrophilic surface than on the hydrophobic surface. Therefore, hydrophilicity might be the dominant factor affecting bacterial adhesion.
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Affiliation(s)
- Jinling Zhu
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Minqi Wang
- Shanghai Jiaotong University, 9th hospital, Shanghai 200011, China
| | - Hongbo Zhang
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Shengbing Yang
- Shanghai Jiaotong University, 9th hospital, Shanghai 200011, China
| | - Ki-Young Song
- School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100811, China
| | - Ruixue Yin
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Wenjun Zhang
- School of Mechatronics and Automation, Shanghai University, Shanghai 200240, China.,College of Engineering, The University of Saskatchewan, Saskatoon, Saskatchewan S7N 5A9, Canada
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30
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Du C, Wang C, Sui J, Zheng L. Enhancing Staphylococcus aureus sterilization of stainless steel by the synergistic effect of surface structure and physical washing. Colloids Surf B Biointerfaces 2020; 197:111393. [PMID: 33059209 DOI: 10.1016/j.colsurfb.2020.111393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/23/2020] [Accepted: 09/26/2020] [Indexed: 12/19/2022]
Abstract
Staphylococcus aureus infection is common in the clinical environment. It has been shown that the presence of micro/nano structures on material surfaces promote bacterial adhesion resistance. Herein, we assessed the S. aureus adhesion properties on laser micro/nano structured stainless-steel (316 L) surfaces after mechanical rotation and ultrasonic washing. The interaction force between S. aureus and structured surfaces was evaluated. A high concentration S. aureus solution was used to evaluate the bacterial sterilization efficiency after film formation on the stainless-steel surface. After 24 h of incubation, S. aureus films were formed on material surfaces. The comparison of static washing, surface mechanical rotation, and ultrasonic washing showed a decrease of S. aureus adhesion on the polished and laser induced periodic surface structures. However, S. aureus adhesion on the micro/nanoparticle surface after mechanical rotation washing did not display any obvious change compared to the polished one. Additionally, specimens after ultrasonic cleaning showed clear antibacterial adhesion than mechanical rotation. After the ultrasonic sterilization process, the laser induced periodic laser surface sample showed optimal bacterial adhesion inhibition. Finally, in vitro tests showed that the biocompatibility of the laser-induced structured surface did not change significantly from the polished surface one.
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Affiliation(s)
- Cezhi Du
- Guangdong University of Technology, No. 100 Waihuan Xi Road, Panyu District, Guangzhou, 510006, China
| | - Chengyong Wang
- Guangdong University of Technology, No. 100 Waihuan Xi Road, Panyu District, Guangzhou, 510006, China.
| | - Jianbo Sui
- Guangdong University of Technology, No. 100 Waihuan Xi Road, Panyu District, Guangzhou, 510006, China
| | - Lijuan Zheng
- Guangdong University of Technology, No. 100 Waihuan Xi Road, Panyu District, Guangzhou, 510006, China
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31
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Ciccone G, Dobre O, Gibson GM, Rey JM, Gonzalez-Garcia C, Vassalli M, Salmeron-Sanchez M, Tassieri M. What Caging Force Cells Feel in 3D Hydrogels: A Rheological Perspective. Adv Healthc Mater 2020; 9:e2000517. [PMID: 32696605 DOI: 10.1002/adhm.202000517] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/29/2020] [Indexed: 12/30/2022]
Abstract
It has been established that the mechanical properties of hydrogels control the fate of (stem) cells. However, despite its importance, a one-to-one correspondence between gels' stiffness and cell behavior is still missing from literature. In this work, the viscoelastic properties of poly(ethylene-glycol) (PEG)-based hydrogels are investigated by means of rheological measurements performed at different length scales. The outcomes of this work reveal that PEG-based hydrogels show significant stiffening when subjected to a compressional deformation, implying that conventional bulk rheology measurements may overestimate the stiffness of hydrogels by up to an order of magnitude. It is hypothesized that this apparent stiffening is caused by an induced "tensional state" of the gel network, due to the application of a compressional normal force during sample loading. Moreover, it is shown that the actual stiffness of the hydrogels is instead accurately determined by means of both passive-video-particle-tracking (PVPT) microrheology and nanoindentation measurements, which are inherently performed at the cell's length scale and in absence of any externally applied force in the case of PVPT. These results underpin a methodology for measuring hydrogels' linear viscoelastic properties that are representative of the mechanical constraints perceived by cells in 3D hydrogel cultures.
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Affiliation(s)
- Giuseppe Ciccone
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
| | - Oana Dobre
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
- Centre for the Cellular Microenvironment, University of Glasgow, G12 8LT, UK
| | - Graham M Gibson
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Jose Manuel Rey
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
- Centre for the Cellular Microenvironment, University of Glasgow, G12 8LT, UK
| | - Cristina Gonzalez-Garcia
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
- Centre for the Cellular Microenvironment, University of Glasgow, G12 8LT, UK
| | - Massimo Vassalli
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
- Centre for the Cellular Microenvironment, University of Glasgow, G12 8LT, UK
| | - Manuel Salmeron-Sanchez
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
- Centre for the Cellular Microenvironment, University of Glasgow, G12 8LT, UK
| | - Manlio Tassieri
- Division of Biomedical Engineering, James Watt School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
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32
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Al-Qatatsheh A, Morsi Y, Zavabeti A, Zolfagharian A, Salim N, Z. Kouzani A, Mosadegh B, Gharaie S. Blood Pressure Sensors: Materials, Fabrication Methods, Performance Evaluations and Future Perspectives. SENSORS (BASEL, SWITZERLAND) 2020; 20:E4484. [PMID: 32796604 PMCID: PMC7474433 DOI: 10.3390/s20164484] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 12/14/2022]
Abstract
Advancements in materials science and fabrication techniques have contributed to the significant growing attention to a wide variety of sensors for digital healthcare. While the progress in this area is tremendously impressive, few wearable sensors with the capability of real-time blood pressure monitoring are approved for clinical use. One of the key obstacles in the further development of wearable sensors for medical applications is the lack of comprehensive technical evaluation of sensor materials against the expected clinical performance. Here, we present an extensive review and critical analysis of various materials applied in the design and fabrication of wearable sensors. In our unique transdisciplinary approach, we studied the fundamentals of blood pressure and examined its measuring modalities while focusing on their clinical use and sensing principles to identify material functionalities. Then, we carefully reviewed various categories of functional materials utilized in sensor building blocks allowing for comparative analysis of the performance of a wide range of materials throughout the sensor operational-life cycle. Not only this provides essential data to enhance the materials' properties and optimize their performance, but also, it highlights new perspectives and provides suggestions to develop the next generation pressure sensors for clinical use.
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Affiliation(s)
- Ahmed Al-Qatatsheh
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Yosry Morsi
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Ali Zavabeti
- Department of Chemical Engineering, The University of Melbourne, Parkville VIC 3010, Australia;
| | - Ali Zolfagharian
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
| | - Nisa Salim
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Abbas Z. Kouzani
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
| | - Bobak Mosadegh
- Dalio Institute of Cardiovascular Imaging, Weill Cornell Medicine, New York, NY 10065, USA;
| | - Saleh Gharaie
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
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33
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Choi HB, Oh J, Kim Y, Pyatykh M, Chang Yang J, Ryu S, Park S. Transparent Pressure Sensor with High Linearity over a Wide Pressure Range for 3D Touch Screen Applications. ACS APPLIED MATERIALS & INTERFACES 2020; 12:16691-16699. [PMID: 32180401 DOI: 10.1021/acsami.0c00267] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The demand for display technology is expected to increase with the continuous spread of portable electronics and with the expected emergence of flexible, wearable, and transparent display devices. A touch screen is a critical component in display technology that enables user interface operations, and the future generation of touch screens, the so-called 3D touch screens, is expected to be able to detect multiple levels of pressure. To enable 3D touch screens, transparent pressure sensors with high linearity over a working range that encompasses the pressure range of human touch (10-100 kPa) are required. In this work, a transparent and linear capacitive pressure sensor is reported with a transmittance over 85% and high linearity (R2 = 0.995) over 5-100 kPa of pressure. To render the sensor transparent, a microstructured "hard" elastomer layer was filled in with a refractive index matching a "soft" elastomer layer, through which light scattering was minimized. High linearity was attained from the sensor's unique architecture that increases the effective area of the capacitor with applied pressure. These attributes render our sensor highly suitable for future 3D touch screen applications.
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Affiliation(s)
- Han Byul Choi
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Jinwon Oh
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Youngsoo Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Mikhail Pyatykh
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Jun Chang Yang
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Seunghwa Ryu
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Steve Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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34
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Ricciardelli A, Casillo A, Corsaro MM, Tutino ML, Parrilli E, van der Mei HC. Pentadecanal and pentadecanoic acid coatings reduce biofilm formation of Staphylococcus epidermidis on PDMS. Pathog Dis 2020; 78:5762676. [PMID: 32105313 DOI: 10.1093/femspd/ftaa012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 02/26/2020] [Indexed: 12/23/2022] Open
Abstract
Staphylococcus epidermidis is well known to be one of the major causes of infections related to medical devices, mostly due to its strong capacity to form device-associated biofilms. Nowadays, these infections represent a severe burden to the public health system and the necessity of novel antibacterial strategies for the treatment of these difficult-to-eradicate infections is urgent. The Antarctic marine bacterium Pseudoalteromonas haloplanktis TAC125 was found to be able to produce an anti-biofilm molecule, the pentadecanal, active against S. epidermidis. In this work, we modified one of the most widely used silicone-based polymers, polydimethylsiloxane (PDMS), by adsorption of pentadecanal and its most promising derivative, pentadecanoic acid, on the PDMS surface. The biofilm formation of S. epidermidis RP62A on both untreated and modified PDMS was performed in a parallel plate flow chamber system, demonstrating the capability of the proposed anti-biofilm coatings to strongly reduce the biofilm formation. Furthermore, drug-release capacity and long-term efficacy (21 days) were also proven for the pentadecanoic acid coating.
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Affiliation(s)
- Annarita Ricciardelli
- Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples, Italy.,Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Angela Casillo
- Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Maria Michela Corsaro
- Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Maria Luisa Tutino
- Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Ermenegilda Parrilli
- Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Henny C van der Mei
- Department of Biomedical Engineering, University of Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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35
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Vourc'h T, Léopoldès J, Peerhossaini H. Clustering of bacteria with heterogeneous motility. Phys Rev E 2020; 101:022612. [PMID: 32168693 DOI: 10.1103/physreve.101.022612] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 02/05/2020] [Indexed: 11/07/2022]
Abstract
We study the clustering of a model cyanobacterium Synechocystis into microcolonies. The bacteria are allowed to diffuse onto surfaces of different hardness and interact with the others by aggregation and detachment. We find that soft surfaces give rise to more microcolonies than hard ones. This effect is related to the amount of heterogeneity of bacteria's dynamics as given by the proportion of motile cells. A kinetic model that emphasizes specific interactions between cells, complemented by extensive numerical simulations considering various amounts of motility, describes the experimental results adequately. The high proportion of motile cells enhances dispersion rather than aggregation.
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Affiliation(s)
- T Vourc'h
- Laboratoire AstroParticules et Cosmologie, CNRS, Université Paris-Diderot, Université de Paris, 5 rue Thomas Mann 75013 Paris, France
| | - J Léopoldès
- ESPCI Paris, PSL Research University, CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France.,Université Paris-Est Marne-la-Vallée, 5 Bd Descartes, Champs sur Marne, Marne-la-Vallée Cedex 2, France
| | - H Peerhossaini
- Laboratoire AstroParticules et Cosmologie, CNRS, Université Paris-Diderot, Université de Paris, 5 rue Thomas Mann 75013 Paris, France.,Mechanics of Active Fluids Laboratory, Department of Civil and Environmental Engineering, Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada N6A3K7
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36
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Peng Q, Zhou X, Wang Z, Xie Q, Ma C, Zhang G, Gong X. Three-Dimensional Bacterial Motions near a Surface Investigated by Digital Holographic Microscopy: Effect of Surface Stiffness. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12257-12263. [PMID: 31423792 DOI: 10.1021/acs.langmuir.9b02103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Surface stiffness plays a critical role in bacterial adhesion, but the mechanism is unclear since the bacterial motion before adhesion is overlooked. Herein, the three-dimensional (3D) motions of Escherichia coli and Pseudonomas sp. nov 776 onto poly(dimethylsiloxane) (PDMS) surfaces with varying stiffness before adhering were monitored by digital holographic microscopy (DHM). As Young's modulus (E) of the PDMS surface decreases from 278.1 to 3.4 MPa, the adhered E. coli and Pseudonomas sp. decrease in number by 40.4 and 34.9%, respectively. Atomic force microscopy (AFM) measurements show that the adhesion force of bacteria to the surface declines with the decreased surface stiffness. In contrast, a nontumbling mutant of adhered E. coli (HCB1414 with the adaptive function being partially deficient) decreases much less (by 18.4%). On the other hand, the tumble frequency (Ft) of E. coli HCB1 and flick frequency (Ff) of Pseudomonas sp. increase as the surface stiffness decreases, and the motion bias (Bθ) of Pseudomonas sp. also increases. These facts clearly indicate that the bacteria have adapted responses to the surface stiffness. RNA sequencing (RNA-seq) reveals that the downregulated Cph2 and CsrA as well as the upregulated GcvA of swimming E. coli HCB1 in bulk near the softer surface promote the bacterial motility.
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Affiliation(s)
- Qingmei Peng
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Xin Zhou
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Zhi Wang
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Qingyi Xie
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Chunfeng Ma
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Xiangjun Gong
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
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