Improved preparation of acellular nerve scaffold and application of PKH26 fluorescent labeling combined with in vivo fluorescent imaging system in nerve tissue engineering

2013 ◽  
Vol 556 ◽  
pp. 52-57 ◽  
Author(s):  
Bin Zhao ◽  
Xiaolei Sun ◽  
Xiulan Li ◽  
Qiang Yang ◽  
Yanjun Li ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Imaging System ◽  
Fluorescent Labeling ◽  
Fluorescent Imaging ◽  
Nerve Tissue ◽  
Nerve Tissue Engineering

Preparation and characterization of conductive poly-dl-lactic-acid/tetra-aniline conduit for peripheral nerve regeneration

2018 ◽  
Vol 34 (2) ◽  
pp. 190-208 ◽  
Author(s):  
Xing-Lei Guo ◽  
Hai-Xing Xu ◽  
Qun-Di He ◽  
Yun-Xuan Yu ◽  
Xiao-Fei Ming ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Lactic Acid ◽  
Peripheral Nerve ◽  
Nerve Regeneration ◽  
Peripheral Nerve Regeneration ◽  
Contact Angles ◽  
Nerve Tissue ◽  
Conductive Composite ◽  
Nerve Tissue Engineering

Defected peripheral nerve regeneration is still a challenge in clinical treatment. Conductive polymers show great potential in nerve tissue engineering because of their electrical property based on bioelectricity in vivo. In this study, conductive composite nerve conduit was synthesized with tetra-aniline and poly-dl-lactic acid. Their properties and the differentiation of rat pheochromocytoma 12 (PC12) cells in vitro stimulated with 200 mV for 1 h were investigated. Different amounts of tetra-aniline (0%, 5%, 10%, and 15%) were used to synthesize the conduits with different conductivities (0, 0.00625, 0.01, and 0.025 s/m, respectively), tensile strengths (2.45, 3.40, 4.45, and 5.50 MPa, respectively), and contact angles (80°, 78.5°, 62.5°, and 61.5°, respectively). The percentage of neurite-bearing cells and the median neurite length increased with an obvious raise of the content of tetra-aniline. In addition, the conduit with subcutaneous implantable experiments in vivo showed less inflammatory response. These promising results illustrated that this poly-dl-lactic acid/tetra-aniline conductive composite conduit had potential for nerve tissue engineering.

Genetically modified canine Schwann cells—In vitro and in vivo evaluation of their suitability for peripheral nerve tissue engineering

2010 ◽  
Vol 186 (2) ◽  
pp. 202-208 ◽  
Author(s):  
Ruth Schmitte ◽  
Andrea Tipold ◽  
Veronika M. Stein ◽  
Henning Schenk ◽  
Cornelia Flieshardt ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Peripheral Nerve ◽  
Schwann Cells ◽  
Genetically Modified ◽  
Nerve Tissue ◽  
In Vivo Evaluation ◽  
Nerve Tissue Engineering

scholarly journals Tailoring Nano-Porous Surface of Aligned Electrospun Poly (L-Lactic Acid) Fibers for Nerve Tissue Engineering

2021 ◽  
Vol 22 (7) ◽  
pp. 3536
Author(s):  
Hongyun Xuan ◽  
Biyun Li ◽  
Feng Xiong ◽  
Shuyuan Wu ◽  
Zhuojun Zhang ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Lactic Acid ◽  
Bacterial Adhesion ◽  
Bacterial Colonization ◽  
Cellular Responses ◽  
Surface Structures ◽  
Porous Surface ◽  
Nerve Tissue ◽  
Proliferation And Differentiation ◽  
Nerve Tissue Engineering

Despite the existence of many attempts at nerve tissue engineering, there is no ideal strategy to date for effectively treating defective peripheral nerve tissue. In the present study, well-aligned poly (L-lactic acid) (PLLA) nanofibers with varied nano-porous surface structures were designed within different ambient humidity levels using the stable jet electrospinning (SJES) technique. Nanofibers have the capacity to inhibit bacterial adhesion, especially with respect to Staphylococcus aureus (S. aureus). It was noteworthy to find that the large nano-porous fibers were less detrimentally affected by S. aureus than smaller fibers. Large nano-pores furthermore proved more conducive to the proliferation and differentiation of neural stem cells (NSCs), while small nano-pores were more beneficial to NSC migration. Thus, this study concluded that well-aligned fibers with varied nano-porous surface structures could reduce bacterial colonization and enhance cellular responses, which could be used as promising material in tissue engineering, especially for neuro-regeneration.

P75 and S100 gene expression induced by cell‐imprinted substrate and beta‐carotene to nerve tissue engineering

2021 ◽  
Vol 138 (26) ◽  
pp. 50624
Author(s):  
Sadaf Dadashkhan ◽  
Shiva Irani ◽  
Shahin Bonakdar ◽  
Behafarid Ghalandari
Keyword(s):  
Gene Expression ◽  
Tissue Engineering ◽  
Beta Carotene ◽  
Nerve Tissue ◽  
Nerve Tissue Engineering ◽  
S100 Gene

scholarly journals Performance of a novel protease-activated fluorescent imaging system for intraoperative detection of residual breast cancer during breast conserving surgery

2021 ◽  
Vol 187 (1) ◽  
pp. 145-153
Author(s):  
Conor R. Lanahan ◽  
Bridget N. Kelly ◽  
Michele A. Gadd ◽  
Michelle C. Specht ◽  
Carson L. Brown ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Real Time ◽  
Imaging System ◽  
Ex Vivo ◽  
Menopausal Status ◽  
Fluorescent Imaging ◽  
Cancer Subtypes ◽  
Surgical Workflow ◽  
Tumor Types

Abstract Purpose Safe breast cancer lumpectomies require microscopically clear margins. Real-time margin assessment options are limited, and 20–40% of lumpectomies have positive margins requiring re-excision. The LUM Imaging System previously showed excellent sensitivity and specificity for tumor detection during lumpectomy surgery. We explored its impact on surgical workflow and performance across patient and tumor types. Methods We performed IRB-approved, prospective, non-randomized studies in breast cancer lumpectomy procedures. The LUM Imaging System uses LUM015, a protease-activated fluorescent imaging agent that identifies residual tumor in the surgical cavity walls. Fluorescent cavity images were collected in real-time and analyzed using system software. Results Cavity and specimen images were obtained in 55 patients injected with LUM015 at 0.5 or 1.0 mg/kg and in 5 patients who did not receive LUM015. All tumor types were distinguished from normal tissue, with mean tumor:normal (T:N) signal ratios of 3.81–5.69. T:N ratios were 4.45 in non-dense and 4.00 in dense breasts (p = 0.59) and 3.52 in premenopausal and 4.59 in postmenopausal women (p = 0.19). Histopathology and tumor receptor testing were not affected by LUM015. Falsely positive readings were more likely when tumor was present < 2 mm from the adjacent specimen margin. LUM015 signal was stable in vivo at least 6.5 h post injection, and ex vivo at least 4 h post excision. Conclusions Intraoperative use of the LUM Imaging System detected all breast cancer subtypes with robust performance independent of menopausal status and breast density. There was no significant impact on histopathology or receptor evaluation.

scholarly journals Cyclic tensile stimulation enrichment of Schwann cell-laden auxetic hydrogel scaffolds towards peripheral nerve tissue engineering

2020 ◽  
Vol 195 ◽  
pp. 108982 ◽  
Author(s):  
Yi-Wen Chen ◽  
Kan Wang ◽  
Chia-Che Ho ◽  
Chia-Tze Kao ◽  
Hooi Yee Ng ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Schwann Cell ◽  
Peripheral Nerve ◽  
Nerve Tissue ◽  
Hydrogel Scaffolds ◽  
Nerve Tissue Engineering

scholarly journals Nerve tissue engineering using blends of poly(3-hydroxyalkanoates) for peripheral nerve regeneration

2015 ◽  
Vol 15 (6) ◽  
pp. 612-621 ◽  
Author(s):  
Lorena R. Lizarraga-Valderrama ◽  
Rinat Nigmatullin ◽  
Caroline Taylor ◽  
John W. Haycock ◽  
Frederik Claeyssens ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Peripheral Nerve ◽  
Nerve Regeneration ◽  
Peripheral Nerve Regeneration ◽  
Nerve Tissue ◽  
Nerve Tissue Engineering

scholarly journals Vascularization Strategies for Peripheral Nerve Tissue Engineering

2018 ◽  
Vol 301 (10) ◽  
pp. 1657-1667 ◽  
Author(s):  
Papon Muangsanit ◽  
Rebecca J. Shipley ◽  
James B. Phillips
Keyword(s):  
Tissue Engineering ◽  
Peripheral Nerve ◽  
Nerve Tissue ◽  
Nerve Tissue Engineering

In Vitro Evaluation of the Growth and Migration of Schwann Cells on Electrospun Silk Fibroin Nanofibers

2011 ◽  
Vol 175-176 ◽  
pp. 220-223 ◽  
Author(s):  
Ai Jun Hu ◽  
Bao Qi Zuo ◽  
Feng Zhang ◽  
Qing Lan ◽  
Huan Xiang Zhang
Keyword(s):  
Tissue Engineering ◽  
Peripheral Nerve ◽  
Nerve Regeneration ◽  
Schwann Cells ◽  
Silk Fibroin ◽  
Nerve Tissue ◽  
Nerve Tissue Engineering ◽  
And Migration ◽  
Silk Fibroin Nanofibers

Schwann cells (SCs) are primary structural and functional cells in peripheral nervous system and play a crucial role in peripheral nerve regeneration. Current challenge in peripheral nerve tissue engineering is to produce an implantable scaffold capable of bridging long nerve gaps and assist Scs in directing the growth of regenerating axons in nerve injury recovery. Electrospun silk fibroin nanofibers, fabricated for the cell culture in vitro, can provide such experiment support. Silk fibroin scaffolds (SFS) were fabricated with formic acid (FA), and the average fiber diameter was 305 ± 24 nm. The data from microscopic, immunohistochemical and scanning electron micrograph confirmed that the scaffold was beneficial to the adherence, proliferation and migration of SCs without exerting any significant cytotoxic effects on their phenotype. Thus, providing an experimental foundation accelerated the formation of bands of Bünger to enhance nerve regeneration. 305 nm SFS could be a candidate material for nerve tissue engineering.

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