Publications by authors named "Nai-Chen Cheng"

Article Synopsis
  • The management of diabetic wounds is difficult, but extracellular vesicles (EVs) from human adipose-derived stem cells (hASCs) show potential for treatment despite challenges with their quantity and quality.
  • A novel method using cell spheroids to culture hASCs successfully increased the yield and angiogenic properties of the EVs, leading to improved wound healing characteristics.
  • In vivo tests on diabetic rats demonstrated that these enhanced EVs significantly improved collagen production, wound closure, and blood vessel formation, suggesting a promising new approach for treating diabetic wounds.
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Article Synopsis
  • * These 3D systems maintain important cellular interactions and mimic natural environments, leading to improved stem cell functions like promoting blood vessel formation and immune responses.
  • * The review covers the foundations, innovations in 3D stem cell engineering, and explores issues like effectiveness, challenging environments, and scaling up for clinical applications.
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Lingual splints have been used to treat mandibular fractures, particularly in cases of complicated mandibular fractures, and serve as a noninvasive adjunctive procedure for reduction and fixation. Furthermore, when used in conjunction with open reduction and internal fixation, the lingual splint provides feasible external fixation against displacing forces exerted by the robust musculature of the mandible. However, the conventional method for lingual splint fabrication is performed preoperatively, and the procedure is time-consuming.

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Background: Foot complications are common in people with diabetes mellitus (DM), leading to increased health care utilization, heightened mortality risk, and notable recurrence rates even after treatment. This retrospective cohort study aimed to investigate the impact of repeated occurrence of DM-related foot complications on the risk of all-cause mortality and to identify the potential risk factors associated with repeated events.

Methods: People with DM admitted with foot complications (ulcer, skin and soft tissue infection, or osteomyelitis) from 2012 to 2014 were identified from Taiwan's National Health Insurance Research Database, with a 3-year follow-up for repeated events.

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Article Synopsis
  • * Using a rat burn model, it reveals that HPL-cultured ASC sheets significantly improve wound closure and collagen formation, while also retaining more ASCs in the treated wounds compared to sheets cultured with FBS.
  • * Results indicate HPL sheets promote better blood vessel formation (angiogenesis) and reduce inflammation and fibrosis in the healing process, with specific factors in HPL enhancing the effects observed.
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Hard-to-heal diabetic foot ulcers (DFUs) are associated with higher mortality rates and an increased medical burden for patients. ON101, a new topical cream, exhibited better healing efficacy than the control dressing in a Phase III trial. In this analysis, we further identify whether ON101 can improve the healing of ulcers with hard-to-heal risk factors in this cohort of DFU patients.

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Background: The endoscopic surgery for persistent muscular torticollis has been well-described and most are subcutaneous working caverns. As the sternocleidomastoid muscle is located beneath the deep cervical fascia that corresponds to the pectoral fascia, this study aimed to review our results of the transaxillary approach under the pectoral fascia and the deep cervical fascia.

Methods: Between November 2009 and January 2022, pediatric patients with persistent muscular torticollis receiving transaxillary endoscopic subfascial operation were retrospectively reviewed and analyzed.

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The Taiwan Society of Cardiology (TSOC) and Taiwan Society of Plastic Surgery (TSPS) have collaborated to develop a joint consensus for the management of patients with advanced vascular wounds. The taskforce comprises experts including preventive cardiologists, interventionists, and cardiovascular and plastic surgeons. The consensus focuses on addressing the challenges in diagnosing, treating, and managing complex wounds; incorporates the perfusion evaluation and the advanced vascular wound care team; and highlights the importance of cross-disciplinary teamwork.

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Article Synopsis
  • Autologous adipose-derived stem cells (ASC) from diabetic patients exhibit reduced function and poor wound healing, prompting research into how glucose levels in culture mediums impact their effectiveness.
  • The study compared the effects of high-glucose and low-glucose conditions on ASCs derived from diabetic humans and mice, finding that low-glucose conditions improved cell proliferation and migration, as well as wound healing in animal models.
  • Results indicate that culturing diabetic ASCs in low-glucose conditions enhances their healing properties, making it a promising approach for treating wounds in diabetic patients in a clinical setting.
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Background: Alveolar mucosa could be a promising source of mesenchymal stem cells (MSCs) for regeneration therapeutics because it exhibits faster healing potential and can be easily collected with minimal periodontal disturbance. This study aimed to evaluate the potential of alveolar mucosal cell (AMC) spheroids for promoting extraction socket healing and calvarial osseous defect regeneration.

Methods: AMCs were isolated from Sprague-Dawley rats.

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The investigation of the effects of electrical and mechanical stimulations on chondrogenesis in tissue engineering scaffolds is essential for realizing successful cartilage repair and regeneration. The aim of articular cartilage tissue engineering is to enhance the function of damaged or diseased articular cartilage, which has limited regenerative capacity. Studies have shown that electrical stimulation (ES) promotes mesenchymal stem cell (MSC) chondrogenesis, while mechanical stimulation (MS) enhances the chondrogenic differentiation capacity of MSCs.

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Objectives: The aim of this study was to investigate the prognostic value of reclassified new type III monomicrobial gram-negative necrotizing fasciitis (NF) and the microbial factors associated with an increased risk of mortality.

Methods: This study included 235 NF cases treated at National Taiwan University Hospital. We compared the mortality risk of NF caused by different causal microorganisms and examined the bacterial virulence genes profile and antimicrobial susceptibility pattern associated with an increase in mortality risk.

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Article Synopsis
  • - The study focuses on silk fibroin (SF) as a material for microneedle (MN) patches designed to deliver stromal cell-derived factor-1 (SDF-1) to recruit adipose stem cells (ASCs) due to its good biocompatibility and mechanical properties.
  • - SF-based MN patches were successfully created using 3M™ templates and showed the ability to penetrate the skin up to 400 μm and provide a sustained release of SDF-1 and a model drug, dextran.
  • - Dual-layer MNs, with a gelatin tip and SF body, were developed to enhance the regulated release of SDF-1, suggesting potential applications in stem cell therapy.
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Background: Diabetes mellitus deteriorates the destruction and impairs the healing of periodontal wounds and craniofacial defects. This study is to evaluate the potential of self-assembled adipose-derived stem cell spheroids (ADsp) in microbial transglutaminase cross-linked gelatin hydrogel (mTG) for treating diabetic periodontal wounds and craniofacial defects.

Methods: Human adipose-derived stem cells (ADSCs) were isolated by lipoaspiration, pluripotent genes and trilineage differentiation were examined, and the maintenance of ADsp properties in mTG was verified.

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Adipose-derived stem cells (ASCs) have raised significant interest for their potential therapeutic applications in regenerative medicine. However, ASCs usually suffer from decreased pluripotency and functional plasticity during expansion. Herein, this study sought to develop a continuous cell production system that can mass-produce ASCs with sustained regenerative capacity.

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Background: Adipose-derived stem cell (ASC) has been considered as a desirable source for cell therapy. In contrast to combining scaffold materials with cells, ASCs can be fabricated into scaffold-free three-dimensional (3D) constructs to promote regeneration at tissue level. However, previous reports have found decreased expression of vascular endothelial growth factor (VEGF) in ASC sheets.

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Background: All types of movements involve the role of articular cartilage and bones. The presence of cartilage enables bones to move over one another smoothly. However, repetitive microtrauma and ischemia as well as genetic effects can cause an osteochondral lesion.

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Biofilm infection has been identified as a crucial factor of the pathogenesis of chronic wound, but wound biofilm diagnosis remains as an unmet clinical need. We previously proposed a modified wound blotting technique using Alcian blue staining for biofilm detection that was characterized as being non-invasive, time-saving, non-expansive, and informative for biofilm distribution. In this study, we adapted a novel Alcian blue grading method as the severity of biofilm infection for the wound blotting technique and compared its biofilm detection efficacy with MolecuLight i:X- a point-of-care florescence imaging device to detect bacteria and biofilm in wounds.

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With the advancements in tissue engineering and three-dimensional (3D) bioprinting, physiologically relevant three-dimensional structures with suitable mechanical and bioactive properties that mimic the biological tissue can be designed and fabricated. However, the available bioinks are less than demanded. In this research, the readily available biomass sources, keratin and glycol chitosan, were selected to develop a UV-curable hydrogel that is feasible for the 3D bioprinting process.

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Tissue engineering based on the combined use of isolated cells, scaffolds, and growth factors is widely used; however, the manufacture of cell-preloaded scaffolds faces challenges. Herein, we fabricated a multicomponent scaffold with multiple component accommodations, including bioactive molecules (BMs), such as fibroblast growth factor-2 (FGF-2) and l-ascorbic acid 2-phosphate (A2-P), and living cells of human adipose-derived stem cells (hASCs), within one scaffold construct. We report an innovative fabrication process based on vapor-phased construction using iced templates for vapor sublimation.

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Conductive polymers (CPs) have received increasing attention as promising materials for studying electrophysiological signals in cell and tissue engineering. The combination of CPs with electrical stimulation (ES) could possibly enhance neurogenesis, osteogenesis, and myogenesis. To date, research has been prioritized on capitalizing CPs as two-dimensional (2D) structures for guiding the differentiation.

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Importance: Delayed healing of diabetic foot ulcers (DFUs) is known to be caused by dysregulated M1/M2-type macrophages, and restoring the balance between these macrophage types plays a critical role in healing. However, drugs used to regulate M1/M2 macrophages have not yet been studied in large randomized clinical trials.

Objective: To compare the topical application of ON101 cream with use of an absorbent dressing (Hydrofiber; ConvaTec Ltd) when treating DFUs.

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Background/purpose: Covering the wounds from guided bone regeneration and sinus floor elevation with oral and sinus mucosa is a fundamental criterion for success. This study aimed to verify the regeneration capability of the mucosal connective tissue stromal cells by characterizing their stemness and osteogenic potentials.

Methods: Bone marrow stromal cells (BMSCs), alveolar mucosa cells (AMCs), keratinized gingival cells (KGCs), and sinus mucosal cells (SMCs), were isolated from four Sprague-Dawley rats.

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