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Nao Hiwatashi, Renjie Bing, Iv Kraja, Ryan C Branski
OBJECTIVES/HYPOTHESIS: Mesenchymal stem cells (MSCs) hold therapeutic promise for vocal fold scar, yet the precise mechanism(s) underlying tissue level changes remain unclear. We hypothesize that MSCs interact with native fibroblasts to favorably affect healing. Furthermore, we hypothesize that these interactions vary based on MSC source. METHODS: Vocal fold fibroblasts (VFFs), adipose-derived stem cells, and bone marrow-derived stem cells (BMSCs) were extracted from Sprague-Dawley rats; and a coculture model was employed culturing VFFs ± transforming growth factor (TGF-β1) (10 ng/mL) ± MSCs...
January 2017: Laryngoscope
Stephan Dürr, Christopher Bohr, Marina Pöttler, Stefan Lyer, Ralf Philipp Friedrich, Rainer Tietze, Michael Döllinger, Christoph Alexiou, Christina Janko
BACKGROUND/AIM: The voice is one of the most important instruments of communication between humans. It is the product of intact and well-working vocal folds. A defect of these structures causes dysphonia, associated with a clear reduction of quality of life. Tissue engineering of the vocal folds utilizing magnetic cell levitation after nanoparticle loading might be a technique to overcome this challenging problem. MATERIALS AND METHODS: Vocal fold fibroblasts (VFFs) were isolated from rabbit larynges and cultured...
June 2016: Anticancer Research
Yo Kishimoto, Ayami Ohno Kishimoto, Shuyun Ye, Christina Kendziorski, Nathan V Welham
Following injury, pathologically activated vocal fold fibroblasts (VFFs) can engage in disordered extracellular matrix (ECM) remodeling, leading to VF fibrosis and impaired voice function. Given the importance of scar VFFs to phenotypically appropriate in vitro modeling of VF fibrosis, we pursued detailed characterization of scar VFFs obtained from surgically injured rat VF mucosae, compared with those obtained from experimentally naïve, age-matched tissue. Scar VFFs initially exhibited a myofibroblast phenotype characterized by increased proliferation, increased Col1a1 transcription and collagen, type I synthesis, increased Acta2 transcription and α-smooth muscle actin synthesis, and enhanced contractile function...
July 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
Rong Hu, Wei Ling, Wen Xu, Demin Han
Tissue engineering has revealed the potential to regenerate injured vocal folds, and identification of the most suitable seed cells has remained a hot topic of research. The aim of this study was to implant fibroblast-like cells differentiated from adipose-derived mesenchymal stem cells (ADSCs) in a canine acute vocal fold wound model. We then sought to characterize changes in the extracellular matrix (ECM) proteins of vocal fold lamina propria. For this purpose, ADSCs were induced to differentiate into fibroblasts under the regulation of connective tissue growth factor in vitro...
2014: PloS One
Matthias Graupp, Karl Kiesler, Gerhard Friedrich, Herwig Ainödhofer, Hans-Jürgen Gruber, Petra Kieslinger, Amulya Saxena, Shigeru Hirano, Markus Gugatschka
INTRODUCTION: Vocal fold (VF) fibroblasts (VFFs) are the central target in developing new strategies for treatment of VF injury and scarring. Nevertheless, only little is known about the basic biological characteristics of these cells. The aim of this study was to explore the impact of age of VFFs on the response to external growth factor stimulation. STUDY DESIGN: In vitro cell study using a rat model. METHODS: VFFs were extracted from young and aged rat VF 3 months after establishing unilateral injury...
July 2014: Journal of Voice: Official Journal of the Voice Foundation
Zhixiang Tong, Aidan B Zerdoum, Randall L Duncan, Xinqiao Jia
Vocal fold disorders affect 3-9% of the U.S. population. Tissue engineering offers an alternative strategy for vocal fold repair. Successful engineering of vocal fold tissues requires a strategic combination of therapeutic cells, biomimetic scaffolds, and physiologically relevant mechanical and biochemical factors. Specifically, we aim to create a vocal fold-like microenvironment to coax stem cells to adopt the phenotype of vocal fold fibroblasts (VFFs). Herein, high frequency vibratory stimulations and soluble connective tissue growth factor (CTGF) were sequentially introduced to mesenchymal stem cells (MSCs) cultured on a poly(ɛ-caprolactone) (PCL)-derived microfibrous scaffold for a total of 6 days...
July 2014: Tissue Engineering. Part A
Liang Zou, Hai-yan Wang, Hao Yuan, Lei Xu, Li Sun, Tie-hu Ye
OBJECTIVE: To investigate the effect of subanaesthetic dose of ketamine on mechanical stimulus on brain regions. METHODS: Totally 13 healthy male volunteers were enrolled in this study,in whom 0 and 100 ng/ml ketamine were administrated by target controlled infusion system in pilot study.After von Frey filaments(vFFs)300 g were used as mechanical stimuli,Visual Analogue Scale scores were evaluated.Functional magnetic resonance imaging(fMRI)was taken 1 week after pilot study at the following sequences:structure imaging+functional imaging(stimulus sequence with 300 g vFFs,ketamine sequence);stimulus sequence=6×(20s on+20s off),with target concentration of ketamine at 0,100 ng/ml...
August 2013: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
Xia Chen, Susan L Thibeault
Mesenchymal stromal cells (MSCs) are multipotential adult cells present in all tissues. Paracrine effects and differentiating ability make MSCs an ideal cell source for tissue regeneration. However, little is known about how interactions between implanted MSCs and native cells influence cellular growth, proliferation, and behaviour. By using an in vitro three-dimensional (3D) co-culture assay of normal or scarred human vocal fold fibroblasts (VFFs) and bone marrow-derived MSCs (BM-MSCs) in a uniquely suited hyaluronan hydrogel (HyStem-VF), we investigated cell morphology, survival rate, proliferation and protein and gene expression of VFFs and BM-MSCs...
May 2016: Journal of Tissue Engineering and Regenerative Medicine
Suzanne N King, Fei Chen, Marie E Jetté, Susan L Thibeault
Recent evidence suggests that fibroblasts play a critical role in regulating inflammation during wound healing because they express several inflammatory mediators in response to bacteria. The objective of this study was to analyze the effects of lipopolysaccharide (LPS) on the immunomodulatory properties of vocal fold fibroblasts (VFFs) derived from polyps, scar and normal tissue co-cultured with macrophages, to provide insight into their interactions during the inflammatory process. Fibroblasts were co-cultured with CD14+ monocytes and after 7 days, wells were treated with LPS for 24 and 72 h...
January 2013: Cytokine
Astrid E St Pierre, Bronwyn A Reelie, Allison R Dolan, Rochelle H Stokes, Janice A Duivestein, Liisa Holsti
BACKGROUND: The prevalence of pediatric feeding and swallowing disorders is high in the special needs population. Videofluoroscopic feeding studies (VFFS) are used to assess feeding, but the accurate interpretation of VFFS depends on consistent use of terminology for describing a physiological swallow. No consensus exists regarding the terminology used for reporting VFFS findings. PURPOSE: The goal of this study was to achieve consensus among pediatric therapists on definitions for terminology used to describe the results of VFFS...
June 2012: Canadian Journal of Occupational Therapy. Revue Canadienne D'ergothérapie
Si-fang Lin, Xiang Quan, Liang Zou, Tie-hu Ye
OBJECTIVE: To observe the effects of different concentrations of propofol on brain regions activated by mechanical stimuli, and then to investigate the analgesic effect of propofol. METHODS: Twenty healthy male volunteers were randomly divided into two groups: light anesthesia group (group L) (BIS 60-80) and deep anesthesia group (group D)(BIS 40-60). Propofol was administrated by target controlled infusion system in pilot study. The target effect site concentration (ESC) of propofol was defined as the average of the ESC from BIS 80 to 60 or BIS 60 to 40 in group L or group D respectively...
June 2012: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
Jun Sato, Yuya Itano, Megumi Funakubo, Hiroyuki Mizoguchi, Mariko Itoh, Rarami Mori
Several clinical studies have demonstrated a consistent relationship between changes in meteorological factors, particularly barometric pressure, and pain intensity in subjects with chronic pain. We have previously demonstrated that exposure to artificially low barometric pressure (LP) intensifies pain-related behaviors in rats with neuropathic pain. In the present study, guinea pigs with unilateral L5 spinal nerve ligation (SNL) were placed in a pressure-controlled chamber and subjected to LP of 10 or 27hPa below the ambient pressure...
October 3, 2011: Neuroscience Letters
Ya Lin, Masaru Yamashita, Jingxian Zhang, Changying Ling, Nathan V Welham
BACKGROUND AND OBJECTIVES: Disruption of the vocal fold extracellular matrix (ECM) can induce a profound and refractory dysphonia. Pulsed dye laser (PDL) irradiation has shown early promise as a treatment modality for disordered ECM in patients with chronic vocal fold scar; however, there are limited data addressing the mechanism by which this laser energy might induce cellular and extracellular changes in vocal fold tissues. In this study, we examined the inflammatory and ECM modulating effects of PDL irradiation on normal vocal fold tissues and cultured vocal fold fibroblasts (VFFs)...
October 2009: Lasers in Surgery and Medicine
Dany J Munoz-Pinto, Andrea Carolina Jimenez-Vergara, L Marcela Gelves, Rebecca E McMahon, Viviana Guiza-Arguello, Mariah S Hahn
A number of treatments are being investigated for vocal fold (VF) scar, including designer implants. The aim of the present study was to validate a 3D model system for probing the effects of various bioactive moieties on VF fibroblast (VFF) behavior toward rational implant design. We selected poly(ethylene glycol) diacrylate (PEGDA) hydrogels as our base-scaffold due to their broadly tunable material properties. However, since cells encapsulated in PEGDA hydrogels are generally forced to take on rounded/stellate morphologies, validation of PEGDA gels as a 3D VFF model system required that the present work directly parallel previous studies involving more permissive scaffolds...
November 1, 2009: Biotechnology and Bioengineering
Mehmet Emre Benlidayi, Alexander Gaggl, Heinz Buerger, Mehmet Kürkcü, Hakki Unlügenç, Danyal Onal, Sait Polat, Leman Sencar
PURPOSE: The aim of this study was to compare the vascularized osteoperiosteal femur flaps (VFFs) and the nonvascularized femur grafts (NVFGs) for reconstruction of the mandibular defects of pigs. MATERIALS AND METHODS: Eight adult domestic pigs were used. The defects created in the mandibular angle were reconstructed with VFFs in 4 pigs (group 1) and NVFGs in the other 4 pigs (group 2). All the pigs were killed after 3 months of healing. Undecalcified and decalcified sections were prepared for histomorphometric analysis and histologic examination...
June 2009: Journal of Oral and Maxillofacial Surgery
Xia Chen, Susan L Thibeault
Tissue regeneration of the vocal fold lamina propria extracellular matrix (ECM) will be facilitated by the use of suitable vocal fold fibroblast (VFF) cell lines in appropriate model systems. Primary human VFFs (hVFFs) were steadily transduced by a retroviral vector containing human telomerase reverse transcriptase (hTERT) gene; immortalized cells grew and divided vigorously for more than 120 days. Biochemical characterization of the six transduced lines included, at different time points, expression of hTERT, telomerase activity, telomere lengths, and transcript levels of ECM constituents...
June 2009: Tissue Engineering. Part C, Methods
Pedro A Valdes-Sosa, Jose Miguel Sanchez-Bornot, Roberto Carlos Sotero, Yasser Iturria-Medina, Yasser Aleman-Gomez, Jorge Bosch-Bayard, Felix Carbonell, Tohru Ozaki
This article reviews progress and challenges in model driven EEG/fMRI fusion with a focus on brain oscillations. Fusion is the combination of both imaging modalities based on a cascade of forward models from ensemble of post-synaptic potentials (ePSP) to net primary current densities (nPCD) to EEG; and from ePSP to vasomotor feed forward signal (VFFSS) to BOLD. In absence of a model, data driven fusion creates maps of correlations between EEG and BOLD or between estimates of nPCD and VFFS. A consistent finding has been that of positive correlations between EEG alpha power and BOLD in both frontal cortices and thalamus and of negative ones for the occipital region...
September 2009: Human Brain Mapping
S M Magnetti, W D Wyant, J Greenwood, N J Roder, J C Linton, A M Ducatman
The distribution and characteristics of workplace injuries for West Virginia volunteer fire fighters (VFFs) are described using 1992 workers' compensation data. Most of the injuries occurred in VFFs who were less than 30 years of age (62%). The most common type of injuries were those in the category of lacerations and contusions (28.9%), with a notable percentage of injuries due to smoke inhalation and respiratory problems (13.7%). The proportional rates related to falls in VFFs were almost twice the national figures for the same year (39...
February 1999: Journal of Occupational and Environmental Medicine
B Nowak, B Kramm, H Schwaier, A Maimaitiming, S Geil, C Zellerhoff, O Przibille, S Rosocha, A Liebrich, J Meyer
UNLABELLED: In single-lead VDD pacing the atrial sensitivity frequently is programmed to sensitive values. Atrial sensing of ventricular far-field signals should be reduced by differential atrial sensing. The aim of the study was to evaluate the effectiveness of this approach. METHODS: The study included 10 patients with a single-lead VDD pacemaker (Thera 8948, Lead 5032). The atrial sensitivity was set to its most sensitive value of 0.18 mV and the telemetered intraatrial EGM was continuously recorded...
November 1998: Pacing and Clinical Electrophysiology: PACE
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