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Woeppel K, Dhawan V, Shi D, Cui XT. Nanotopography-enhanced biomimetic coating maintains bioactivity after weeks of dry storage and improves chronic neural recording. Biomaterials 2023; 302:122326. [PMID: 37716282 PMCID: PMC10993103 DOI: 10.1016/j.biomaterials.2023.122326] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 09/01/2023] [Accepted: 09/11/2023] [Indexed: 09/18/2023]
Abstract
We developed a nanoparticle base layer technology capable of maintaining the bioactivity of protein-based neural probe coating intended to improve neural recording quality. When covalently bound on thiolated nanoparticle (TNP) modified surfaces, neural adhesion molecule L1 maintained bioactivity throughout 8 weeks of dry storage at room temperature, while those bound to unmodified surfaces lost 66% bioactivity within 3 days. We tested the TNP + L1 coating in mouse brains on two different neural electrode arrays after two different dry storage durations (3 and 28 days). The results show that dry-stored coating is as good as the freshly prepared, and even after 28 days of storage, the number of single units per channel and signal-to-noise ratio of the TNP + L1 coated arrays were significantly higher by 32% and 40% respectively than uncoated controls over 16 weeks. This nanoparticle base layer approach enables the dissemination of biomolecule-functionalized neural probes to users worldwide and may also benefit a broad range of applications that rely on surface-bound biomolecules.
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Affiliation(s)
- Kevin Woeppel
- University of Pittsburgh, Department of Bioengineering, 4200 Fifth Avenue, Pittsburgh, PA, 15260, USA; Center for the Neural Basis of Cognition, 4400 Fifth Avenue, Suite 115, Pittsburgh, PA, 15213, USA
| | - Vaishnavi Dhawan
- University of Pittsburgh, Department of Bioengineering, 4200 Fifth Avenue, Pittsburgh, PA, 15260, USA; Center for the Neural Basis of Cognition, 4400 Fifth Avenue, Suite 115, Pittsburgh, PA, 15213, USA
| | - Delin Shi
- University of Pittsburgh, Department of Bioengineering, 4200 Fifth Avenue, Pittsburgh, PA, 15260, USA; Center for the Neural Basis of Cognition, 4400 Fifth Avenue, Suite 115, Pittsburgh, PA, 15213, USA
| | - Xinyan Tracy Cui
- University of Pittsburgh, Department of Bioengineering, 4200 Fifth Avenue, Pittsburgh, PA, 15260, USA; Center for the Neural Basis of Cognition, 4400 Fifth Avenue, Suite 115, Pittsburgh, PA, 15213, USA; McGowan Institute for Regenerative Medicine, 450 Technology Drive, Suite 300, Pittsburgh, PA, 15219, USA.
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Spray Freeze Drying of Biologics: A Review and Applications for Inhalation Delivery. Pharm Res 2022; 40:1115-1140. [DOI: 10.1007/s11095-022-03442-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/17/2022] [Indexed: 12/05/2022]
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Neuroadhesive protein coating improves the chronic performance of neuroelectronics in mouse brain. Biosens Bioelectron 2020; 155:112096. [PMID: 32090868 DOI: 10.1016/j.bios.2020.112096] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 02/06/2020] [Accepted: 02/12/2020] [Indexed: 12/15/2022]
Abstract
Intracortical microelectrodes are being developed to both record and stimulate neurons to understand brain circuitry or restore lost functions. However, the success of these probes is hampered partly due to the inflammatory host tissue responses to implants. To minimize the foreign body reactions, L1, a brain derived neuronal specific cell adhesion molecule, has been covalently bound to the neural electrode array surface. Here we evaluated the chronic recording performance of L1-coated silicon based laminar neural electrode arrays implanted into V1m cortex of mice. The L1 coating enhanced the overall visually evoked single-unit (SU) yield and SU amplitude, as well as signal-to-noise-ratio (SNR) in the mouse brain compared to the uncoated arrays across the 0-1500 μm depth. The improvement in recording is most dramatic in the hippocampus region, where the control group showed severe recording yield decrease after one week, while the L1 implants maintained a high SU yield throughout the 16 weeks. Immunohistological analysis revealed significant increases of axonal and neuronal density along with significantly lowered microglia activation around the L1 probe after 16 weeks. These results collectively confirm the effectiveness of L1 based biomimetic coating on minimizing inflammatory tissue response and improving neural recording quality and longevity. Improving chronic recording will benefit the brain-computer interface technologies and neuroscience studies involving chronic tracking of neural activities.
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Feasibility study for intraepidermal delivery of proteins using a solid microneedle array. Int J Pharm 2015; 486:52-8. [DOI: 10.1016/j.ijpharm.2015.03.046] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 03/20/2015] [Indexed: 11/23/2022]
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Wanning S, Süverkrüp R, Lamprecht A. Pharmaceutical spray freeze drying. Int J Pharm 2015; 488:136-53. [PMID: 25900097 DOI: 10.1016/j.ijpharm.2015.04.053] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/15/2015] [Accepted: 04/16/2015] [Indexed: 11/29/2022]
Abstract
Pharmaceutical spray-freeze drying (SFD) includes a heterogeneous set of technologies with primary applications in apparent solubility enhancement, pulmonary drug delivery, intradermal ballistic administration and delivery of vaccines to the nasal mucosa. The methods comprise of three steps: droplet generation, freezing and sublimation drying, which can be matched to the requirements given by the dosage form and route of administration. The objectives, various methods and physicochemical and pharmacological outcomes have been reviewed with a scope including related fields of science and technology.
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Affiliation(s)
- Stefan Wanning
- Laboratory of Pharmaceutical Technology and Biopharmaceutics, Institute of Pharmacy, University of Bonn, Bonn, Germany
| | - Richard Süverkrüp
- Laboratory of Pharmaceutical Technology and Biopharmaceutics, Institute of Pharmacy, University of Bonn, Bonn, Germany
| | - Alf Lamprecht
- Laboratory of Pharmaceutical Technology and Biopharmaceutics, Institute of Pharmacy, University of Bonn, Bonn, Germany; Laboratory of Pharmaceutical Engineering (EA4267), University of Franche-Comté, Besançon, France.
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Nosworthy NJ, McKenzie DR, Bilek MM. A New Surface for Immobilizing and Maintaining the Function of Enzymes in a Freeze-Dried State. Biomacromolecules 2009; 10:2577-83. [DOI: 10.1021/bm900523m] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Neil J. Nosworthy
- Applied and Plasma Physics, School of Physics (A28), The University of Sydney, Sydney, NSW 2006, Australia
| | - David R. McKenzie
- Applied and Plasma Physics, School of Physics (A28), The University of Sydney, Sydney, NSW 2006, Australia
| | - Marcela M. Bilek
- Applied and Plasma Physics, School of Physics (A28), The University of Sydney, Sydney, NSW 2006, Australia
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