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Fellin CR, Steiner RC, Buchen JT, Anders JJ, Jariwala SH. Photobiomodulation and Vascularization in Conduit-Based Peripheral Nerve Repair: A Narrative Review. Photobiomodul Photomed Laser Surg 2024; 42:1-10. [PMID: 38109199 DOI: 10.1089/photob.2023.0103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023] Open
Abstract
Background: Peripheral nerve injuries pose a significant clinical issue for patients, especially in the most severe cases wherein complete transection (neurotmesis) results in total loss of sensory/motor function. Nerve guidance conduits (NGCs) are a common treatment option that protects and guides regenerating axons during recovery. However, treatment outcomes remain limited and often fail to achieve full reinnervation, especially in critically sized defects (>3 cm) where a lack of vascularization leads to neural necrosis. Conclusions: A multitreatment approach is, therefore, necessary to improve the efficacy of NGCs. Stimulating angiogenesis within NGCs can help alleviate oxygen deficiency through rapid inosculation with the host vasculature, whereas photobiomodulation therapy (PBMT) has demonstrated beneficial therapeutic effects on regenerating nerve cells and neovascularization. In this review, we discuss the current trends of NGCs, vascularization, and PBMT as treatments for peripheral nerve neurotmesis and highlight the need for a combinatorial approach to improve functional and clinical outcomes.
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Affiliation(s)
- Christopher R Fellin
- The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
- The Center for Rehabilitation Sciences Research, Department of Physical Medicine and Rehabilitation, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
| | - Richard C Steiner
- The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
- The Center for Rehabilitation Sciences Research, Department of Physical Medicine and Rehabilitation, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
| | - Jack T Buchen
- The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
- The Center for Rehabilitation Sciences Research, Department of Physical Medicine and Rehabilitation, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
| | - Juanita J Anders
- Department of Anatomy, Physiology and Genetics, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
| | - Shailly H Jariwala
- The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
- The Center for Rehabilitation Sciences Research, Department of Physical Medicine and Rehabilitation, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
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Swanson S, Bashmail R, Fellin CR, Luu V, Shires N, Cox PA, Nelson A, MacKenzie D, Taroc AM, Nelson LY, Seibel EJ. Prototype Development of a Temperature-Sensitive High-Adhesion Medical Tape to Reduce Medical-Adhesive-Related Skin Injury and Improve Quality of Care. Int J Mol Sci 2022; 23:7164. [PMID: 35806167 PMCID: PMC9266747 DOI: 10.3390/ijms23137164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/23/2022] [Accepted: 06/26/2022] [Indexed: 02/01/2023] Open
Abstract
Medical adhesives are used to secure wound care dressings and other critical devices to the skin. Without means of safe removal, these stronger adhesives are difficult to painlessly remove from the skin and may cause medical-adhesive-related skin injuries (MARSI), including skin tears and an increased risk of infection. Lower-adhesion medical tapes may be applied to avoid MARSI, leading to device dislodgement and further medical complications. This paper outlines the development of a high-adhesion medical tape designed for low skin trauma upon release. By warming the skin-attached tape for 10-30 s, a significant loss in adhesion was achieved. A C14/C18 copolymer was developed and combined with a selected pressure-sensitive adhesive (PSA) material. The addition of 1% C14/C18 copolymer yielded the largest temperature-responsive drop in surface adhesion. The adhesive film was characterized using AFM, and distinct nanodomains were identified on the exterior surface of the PSA. Our optimized formulation yielded 67% drop in adhesion when warmed to 45 °C, perhaps due to melting nanodomains weakening the adhesive-substrate boundary layer. Pilot clinical testing resulted in a significant decrease in pain when a heat pack was used for removal, giving an average pain reduction of 66%.
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Affiliation(s)
- Shawn Swanson
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
| | - Rahaf Bashmail
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
| | - Christopher R. Fellin
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA; (C.R.F.); (A.N.)
| | - Vivian Luu
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
| | - Nicholas Shires
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
| | - Phillip A. Cox
- Washington Clean Energy Testbeds, University of Washington, Seattle, WA 98105, USA;
| | - Alshakim Nelson
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA; (C.R.F.); (A.N.)
| | - Devin MacKenzie
- Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA;
| | | | - Leonard Y. Nelson
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
| | - Eric J. Seibel
- Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; (S.S.); (R.B.); (V.L.); (N.S.); (L.Y.N.)
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Fellin CR, Nelson A. Direct-Ink Write 3D Printing Multistimuli-Responsive Hydrogels and Post-Functionalization Via Disulfide Exchange. ACS Appl Polym Mater 2022; 4:3054-3061. [PMID: 38239328 PMCID: PMC10795753 DOI: 10.1021/acsapm.1c01538] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2024]
Abstract
Herein, we describe a multi-stimuli-responsive hydrogel that can be 3D printed via a direct-ink write process to afford cross-linked hydrogel networks that can be post-functionalized with thiol-bearing molecules. Poly(alkyl glycidyl ether)s with methacrylate groups at their termini were synthesized and self-assembled into hydrogels with three key stimuli-responsive behaviors necessary for extrusion based 3D printing: a sol-gel temperature response, shear-thinning behavior, and the ability to be photochemically crosslinked. In addition, the chemically crosslinked hydrogels demonstrated a temperature dependent swelling consistent with an LCST behavior. Pyridyl disulfide urethane methacrylate (PDS-UM) monomers were introduced into the network as a thiol-reactive handle for post-functionalization of the hydrogel. The reactivities of these hydrogels were investigated at different temperatures (5, 25, 37 °C) and swelling statuses (as-cured versus preswollen) using glutathione as a reactive probe. To illustrate the versatility of the platform, a number of additional thiol-containing probes such as proteins, polymers, and small molecules were conjugated to the hydrogel network at different temperatures, pH's, and concentrations. In a final demonstration of the multi-stimuli-responsive hydrogel platform, a customized DIW 3D printer was used to fabricate a printed object that was subsequently conjugated with a fluorescent tag and displayed the ability to change in size with environmental temperature.
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Affiliation(s)
| | - Alshakim Nelson
- Department of Chemistry, University of Washington, Seattle, Washington 98105, USA
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Johnston TG, Fellin CR, Carignano A, Nelson A. Poly(alkyl glycidyl ether) hydrogels for harnessing the bioactivity of engineered microbes. Faraday Discuss 2019; 219:58-72. [DOI: 10.1039/c9fd00019d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Herein, we describe a method to produce yeast-laden hydrogel inks for the direct-write 3D printing of cuboidal lattices for immobilized whole-cell catalysis.
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Affiliation(s)
| | | | - Alberto Carignano
- Department of Electrical Engineering
- University of Washington
- Seattle
- USA
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Fellin CR, Adelmund SM, Karis DG, Shafranek RT, Ono RJ, Martin CG, Johnston TG, DeForest CA, Nelson A. Tunable temperature‐ and shear‐responsive hydrogels based on poly(alkyl glycidyl ether)s. POLYM INT 2018. [DOI: 10.1002/pi.5716] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Steven M Adelmund
- Department of Chemical Engineering University of Washington Seattle WA USA
| | - Dylan G Karis
- Department of Chemistry University of Washington Seattle WA USA
| | | | - Robert J Ono
- Department of Chemistry University of Washington Seattle WA USA
| | | | | | - Cole A DeForest
- Department of Chemical Engineering University of Washington Seattle WA USA
| | - Alshakim Nelson
- Department of Chemistry University of Washington Seattle WA USA
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Tian Z, Hess A, Fellin CR, Nulwala H, Allcock HR. Phosphazene High Polymers and Models with Cyclic Aliphatic Side Groups: New Structure–Property Relationships. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00946] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Zhicheng Tian
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Andrew Hess
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Christopher R. Fellin
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Hunaid Nulwala
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
- National
Energy
Technology Laboratory, P.O. Box 10940, Pittsburgh, Pennsylvania 15236, United States
| | - Harry R. Allcock
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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