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Wei-Ze Syu, Shyi-Gen Chen, James Yi-Hsin Chan, Chih-Hsin Wang, Niann-Tzyy Dai, Shih-Ming Huang
INTRODUCTION: Reconstruction of segmental peripheral nerve gap is still challenging when the autografts are unavailable owing to limited availability of donor site and functional recovery. The creation of artificial conduits composed of biological or synthetic materials is still developing. Acellular dermal matrix (ADM) has been widely studied and its extension and plasticity properties may become suitable nerve conduits under different forms of nerve gaps. Adipose-derived stem cells (ADSCs) have the potential to differentiate into various cell types of different germ layers including neural stem cells (NSCs)...
January 2019: Annals of Plastic Surgery
Marek Kucharzewski, Ewa Rojczyk, Katarzyna Wilemska-Kucharzewska, Renata Wilk, Jacek Hudecki, Marek J Los
The latest findings indicate the huge therapeutic potential of stem cells in regenerative medicine, including the healing of chronic wounds. Main stem cell types involved in wound healing process are: epidermal and dermal stem cells, mesenchymal stem cells (MSCs), endothelial progenitor cells (EPCs) and hematopoietic stem cells (HSCs). In the therapy of chronic wounds, they can be administrated either topically or using different matrix like hydrogels, scaffolds, dermal substitutes and extracellular matrix (ECM) derivatives...
December 8, 2018: European Journal of Pharmacology
Shuyi Wei, Dennis P Orgill, Giorgio Giatsidis
INTRODUCTION: External Volume Expansion (EVE) promotes angiogenesis in tissues by inducing a sub-critical hypoxia, mechanically stimulating endothelia, and creating mild inflammation. Application of EVE to less-vascularized tissues with endothelial cell dysfunction (ECD) (e.g., diabetic skin) poses a risk for ineffectiveness or ischemic damage. We investigated the effects of EVE on a murine model of diabetes type-2 and tested whether the adoption of micro-deformational interfaces of EVE optimizes its angiogenic properties while limiting complications to tissues...
November 26, 2018: Plastic and Reconstructive Surgery
Jenna N Harvestine, Hakan Orbay, Jonathan Y Chen, David E Sahar, J Kent Leach
Lipoaspirates contain a readily accessible heterogeneous cell source for use in bone regeneration collectively referred to as the stromal vascular fraction (SVF). However, the osteogenic potential of SVF is inferior to other progenitor cell populations, thereby requiring alternative strategies to potentiate its effective use in cell-based therapies of bone repair. Cell-secreted extracellular matrix (ECM) is a promising substrate to guide cell phenotype or for use in biomaterial design, yet the instructional capacity of ECMs produced by various cell types is unknown...
June 28, 2018: Journal of Materials Chemistry. B, Materials for Biology and Medicine
Veera Nikkola, Maija E Miettinen, Piia Karisola, Mari Grönroos, Lasse Ylianttila, Harri Alenius, Erna Snellman, Timo Partonen
BACKGROUND: Recent findings suggest that circadian time regulates cellular functions in the skin and may affect protection against ultraviolet radiation (UVR). It is not known, however, whether UVR through skin directly affects the expression of circadian genes. We investigated the effect of ultraviolet-B (UVB) exposure on cryptochrome circadian clock 1 (CRY1), cryptochrome circadian clock 2 (CRY2), and circadian associated repressor of transcription (CIART) genes. METHODS: Healthy volunteers (n=12) were exposed to narrow-band UVB radiation of 4 standard erythemal dose (SED)...
November 25, 2018: Photodermatology, Photoimmunology & Photomedicine
Charles Miles Maliska Iii, Robert Lloyd Archer, Sharon Kaye Tarpley, Archibald Sanford Miller Iii
Sternal malunion, or loss, developed after a median sternotomy cannot only be difficult to manage and treat, but also may diminish one's quality-of-life drastically. The technique presented here represents a multispecialty approach in one stage for the reconstruction of an unstable thoracic cage. The procedure utilized a donated sternum and ribs. The sternum with ribs harvested from a single donor included adipose derived stromal vascular fraction (ADSVF) cells with marrow also from the same donor. Autologous muscle flaps, stabilized with acellular dermal matrix were utilized to provide a robust blood supply to the ADSVF cells and bone grafts...
November 2018: Archives of Plastic Surgery
Gleb Baida, Pankaj Bhalla, Alexander Yemelyanov, Lance A Stechschulte, Weinian Shou, Ben Readhead, Joel T Dudley, Edwin R Sánchez, Irina Budunova
FKBP51 (FK506-binding protein 51) is a known co-chaperone and regulator of the glucocorticoid receptor (GR), which usually attenuates its activity. FKBP51 is one of the major GR target genes in skin, but its role in clinical effects of glucocorticoids is not known. Here, we used FKBP51 knockout (KO) mice to determine FKBP51's role in the major adverse effect of topical glucocorticoids, skin atrophy. Unexpectedly, we found that all skin compartments (epidermis, dermis, dermal adipose and CD34+ stem cells) in FKBP51 KO animals were much more resistant to glucocorticoid-induced hypoplasia...
October 5, 2018: Oncotarget
Chiara Fiorillo, Maria Rosaria D'Apice, Federica Trucco, Michela Murdocca, Paola Spitalieri, Stefania Assereto, Serena Baratto, Guido Morcaldi, Carlo Minetti, Federica Sangiuolo, Giuseppe Novelli
Mandibular hypoplasia, deafness, and progeroid features, with concomitant lipodystrophy, define a multisystem disorder named MDPL syndrome. MDPL has been associated with heterozygous mutations in POLD1 gene resulting in loss of DNA polymerase δ activity. In this study, we report clinical, genetic, and cellular studies of a 13-year-old Pakistani girl, presenting growth retardation, sensorineural deafness, altered distribution of subcutaneous adipose tissue, and insulin resistance. We performed Sanger sequencing of POLD1 gene in the proband and the healthy parents...
November 2, 2018: DNA and Cell Biology
Pascal Morissette Martin, Aaron Grant, Douglas W Hamilton, Lauren E Flynn
There is a substantial need for new strategies to stimulate cutaneous tissue repair in the treatment of chronic wounds. To address this challenge, our team is developing modular biomaterials termed "bead foams", comprised of porous beads synthesized exclusively of extracellular matrix (ECM) and assembled into a cohesive three-dimensional (3-D) network. In the current study, bead foams were fabricated from human decellularized adipose tissue (DAT) or commercially-sourced bovine tendon collagen (COL) to explore the effects of ECM composition on human wound edge dermal fibroblasts (weDF) sourced from chronic wound tissues...
October 29, 2018: Acta Biomaterialia
Joris A van Dongen, Martin C Harmsen, Berend van der Lei, Hieronymus P Stevens
The skin is the largest organ of the human body and is the first line of defense against physical and biological damage. Thus, the skin is equipped to self-repair and regenerates after trauma. Skin regeneration after damage comprises a tightly spatial-temporally regulated process of wound healing that involves virtually all cell types in the skin. Wound healing features five partially overlapping stages: homeostasis, inflammation, proliferation, re-epithelization, and finally resolution or fibrosis. Dysreguled wound healing may resolve in dermal scarring...
October 26, 2018: Bioengineering
F Li, Y F Chi, Q Hu, K N Yin, W Liu, Q Chen, Q X Zhang, X Chen, F C Cao, Z L Liang, Y J Sun
Objective: To observe the effects of minimally invasive tangential excision in treating deep partial-thickness burn wounds on trunk and limbs in pediatric patients in the early stage post burn. Methods: Clinical data of 40 children with deep partial-thickness burn wounds on trunk and limbs, admitted to our burn ward from January 2016 to June 2017, conforming to the study criteria, were retrospectively analyzed. They were divided into conventional treatment group (CT, n =19) and minimally invasive tangential excision group (MITE, n =21) according to the different treatments...
October 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
Mohamad Javad Mirzaei-Parsa, Hossein Ghanbari, Behnam Alipoor, Amirhossein Tavakoli, Mohammad Reza H Najafabadi, Reza Faridi-Majidi
Full-thickness skin defect is one of the main clinical problems, which cannot be repaired spontaneously. The aim of this study was to evaluate the feasibility of combining nanofibers with ADM as a bilayer scaffold for treatment of full-thickness skin wounds in a single-step procedure. The nanofibrous polycaprolactone/fibrinogen scaffolds were fabricated by electrospinning. Subsequently, mesenchymal stem cells were isolated from rat adipose tissues and characterized by flow cytometry. Cell adhesion, proliferation, and the epidermal differentiation potential of adipose-derived stem cells (ADSCs) on nanofibrous scaffolds were investigated by scanning electron microscopy (SEM), alamarBlue, and real-time PCR, respectively...
October 18, 2018: Cell and Tissue Research
Jeremy A Goss, Reid A Maclellan, Arin K Greene
BACKGROUND: Primary idiopathic lymphedema is an uncommon condition that typically affects the lower extremities. Patients have a malformed lymphatic system that causes subcutaneous fluid and adipose deposition. Rarely, the disease also has been described in the upper extremities. The purpose of this study was to investigate a cohort of patients with primary arm lymphedema to better understand the disease. METHODS: Patients evaluated in our Lymphedema Program between 2008 and 2018 were reviewed for individuals with upper extremity primary lymphedema...
October 2, 2018: Lymphatic Research and Biology
Jeremy A Antonyshyn, Meghan J McFadden, Anthony O Gramolini, Stefan O P Hofer, J Paul Santerre
Considerable effort has been directed toward deriving endothelial cells (ECs) from adipose-derived mesenchymal stem cells (ASCs) since 2004, when it was first suggested that ECs and adipocytes share a common progenitor. While the capacity of ASCs to express endothelial markers has been repeatedly demonstrated, none constitute conclusive evidence of an endothelial phenotype as all reported markers have been detected in other, non-endothelial cell types. In this study, quantitative phenotypic comparisons to representative EC controls were used to determine the extent of endothelial differentiation being achieved with ASCs...
September 30, 2018: Stem Cells Translational Medicine
Denise R Cooper, Chunyan Wang, Rehka Patel, Andrea Trujillo, Niketa A Patel, Jamie Prather, Lisa J Gould, Mack H Wu
Objective: Chronically ill patients heal recalcitrant ulcerative wounds more slowly. Human adipose-derived stem cells (hADSCs) play an important role in tissue regeneration and exosomes secreted by hADSC contribute to their paracrine signaling. In addition to cytokines, lipids and growth factors, hADSC secrete mRNA, miRNA, and long noncoding (lnc) RNA into exosomes. In this study we examined the role of lncRNA MALAT1 (metastasis-associated lung adenocarcinoma transcript 1), an abundant lncRNA in exosomes from conditioned media (CM), on cell migration and ischemic wound healing...
September 1, 2018: Advances in Wound Care
Florian S Frueh, Nadia Sanchez-Macedo, Maurizio Calcagni, Pietro Giovanoli, Nicole Lindenblatt
BACKGROUND: The treatment of extensive skin defects and bradytrophic wounds remains a challenge in clinical practice. Despite emerging tissue engineering approaches, skin grafts and dermal substitutes are still the routine procedure for the majority of skin defects. Here, we review the role of vascularization and lymphangiogenesis for skin grafting and dermal substitutes from the clinician's perspective. SUMMARY: Graft revascularization is a dynamic combination of inosculation, angiogenesis, and vasculogenesis...
2018: European Surgical Research. Europäische Chirurgische Forschung. Recherches Chirurgicales Européennes
Uwe Wollina, Piotr Brzezinski
Aesthetic dermatology (AD) is a rapidly growing subspecialty of dermatology. The acceptance of AD in scientific community and the society is associated with its competence, efficiency, and seriousness. This review highlights some recent developments toward new tools, techniques, and understanding in the field of AD. Analyzing the specific needs of patients and assessing the effect by objective measurements is important for further progress. For long time ignored, white adipose tissue has gained increasing interest in biology and rejuvenation...
September 4, 2018: Dermatologic Therapy
Stefania Niada, Chiara Giannasi, Alice Gualerzi, Giuseppe Banfi, Anna Teresa Brini
The adult stem cell secretome is currently under investigation as an alternative to cell-based therapy in regenerative medicine, thanks to the remarkable translational opportunity and the advantages in terms of handling and safety. In this perspective, we recently demonstrated the efficient performance of the adipose-derived mesenchymal stem/stromal cell (ASC) secretome in contrasting neuroinflammation in a murine model of diabetic neuropathy, where the administration of factors released by dermal fibroblasts (DFs) did not exert any effect...
2018: Stem Cells International
Nahyun Choi, Junjeong Choi, Ji Hye Kim, Yaeji Jang, Joo Hye Yeo, Juwon Kang, Seung Yong Song, Jinu Lee, Jong-Hyuk Sung
BACKGROUND: Previous studies demonstrated that adipose-derived stem cells (ASCs) can promote hair growth, but unmet needs exist for enhancing ASC hair inductivity. OBJECTIVE: Therefore, we introduced three trichogenic factors platelet-derived growth factor-A, SOX2, and β-catenin to ASCs (tfASCs) and evaluated whether tfASCs have similar characteristics as dermal papilla (DP) cells. METHOD: Global gene expression was examined using NGS analysis...
October 2018: Journal of Dermatological Science
A Miroux-Catarino, C Claro, I Viana
Fibrous hamartoma of infancy (FHI) is a rare benign soft tissue tumor with a triphasic organoid histologic appearance. The authors present a case of a 21-month-old healthy girl with a slowly growing flesh-colored subcutaneous plaque 12cm in size on the lower back, with overlying hypertrichosis. A punch biopsy revealed a proliferation of spindle cells infiltrating the dermis and hypodermis organized in a dense storiform pattern with a strong diffuse positivity for CD34. The diagnosis of congenital dermatofibrosarcoma protuberans (DFSP) was considered and an excision was performed...
June 15, 2018: Dermatology Online Journal
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