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Hair cell regeneration

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https://www.readbyqxmd.com/read/28427959/beneficial-effects-of-heparin-and-l-arginine-on-dermonecrosis-effect-induced-by-vipera-lebetina-venom-involvement-of-no-in-skin-regeneration
#1
Nouara Bennacef-Heffar, Fatima Laraba-Djebari
It is well known that snake venoms such as Viperidae caused severe local effects such as hemorrhage, myonecrosis and dermonecrosis which can lead to permanent tissue loss or the disability. The aim of this study is to evaluate the skin regeneration using heparin and L-arginine as well as the dermonecrotic effects induced by Vipera lebetina venom (VLV). To better understand the toxic effects induced by VLV and to prevent or treat these effects, we evaluate the local effects and the skin regeneration with or without drugs...
April 17, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28423680/a-bioartificial-dermal-regeneration-template-promotes-skin-cell-proliferation-in-vitro-and-enhances-large-skin-wound-healing-in-vivo
#2
Peng Chang, Bingyu Guo, Qiang Hui, Xiaoyan Liu, Kai Tao
A novel bioartificial dermal regeneration template has been developed using platelet-rich plasma and acellular animal skin collagen sponge for the treatment of larger area and full thickness skin wounds. This platelet-rich plasma-collagen sponge keeps native skin structure and contains huge amounts of growth factors. The effect of this bioartificial dermal regeneration template was tested in vitro and in vivo via a mimic poor wound healing process by adding collagenase I into cell culture medium or the wound area...
March 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28418596/hair-follicle-dermal-stem-cells-and-skin-derived-precursor-cells-exciting-tools-for-endogenous-and-exogenous-therapies
#3
Natacha A Agabalyan, Nicole L Rosin, Waleed Rahmani, Jeff Biernaskie
Understanding the cellular interactions and molecular signals underlying hair follicle (HF) regeneration may have significant implications for restorative therapies for skin disease that diminish hair growth, whilst also serving to provide fundamental insight into the mechanisms underlying adult tissue regeneration. One of the major, yet underappreciated, players in this process is the underlying HF mesenchyme. Here, we provide an overview of a mesenchymal progenitor pool referred to as hair follicle dermal stem cells (hfDSCs), discuss their potential functions within the skin, their relationship to Skin-derived precursors (SKPs) and consider unanswered questions about the function of these specialized fibroblasts...
April 18, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28414155/recent-advances-in-cochlear-hair-cell-regeneration-a-promising-opportunity-for-the-treatment-of-age-related-hearing-loss
#4
REVIEW
Miren Revuelta, Francisco Santaolalla, Olatz Arteaga, Antonia Alvarez, Ana Sánchez Del Rey, Enrique Hilario
The objective of this paper is to review current information regarding the treatment of age-related hearing loss by using cochlear hair cell regeneration. Recent advances in the regeneration of the inner ear, including the usefulness of stem cells, are also presented. Based on the current literature, cochlear cell regeneration may well be possible in the short term and cochlear gene therapy may also be useful for the treatment of hearing loss associated with ageing. The present review provide further insight into the pathogenesis of Inner Ear senescence and aged-related hearing loss and facilitate the development of therapeutic strategies to repair hair cells damaged by ageing...
April 13, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28413068/epithelial-mesenchymal-micro-niches-govern-stem-cell-lineage-choices
#5
Hanseul Yang, Rene C Adam, Yejing Ge, Zhong L Hua, Elaine Fuchs
Adult tissue stem cells (SCs) reside in niches, which, through intercellular contacts and signaling, influence SC behavior. Once activated, SCs typically give rise to short-lived transit-amplifying cells (TACs), which then progress to differentiate into their lineages. Here, using single-cell RNA-seq, we unearth unexpected heterogeneity among SCs and TACs of hair follicles. We trace the roots of this heterogeneity to micro-niches along epithelial-mesenchymal interfaces, where progenitors display molecular signatures reflective of spatially distinct local signals and intercellular interactions...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28403520/study-of-gene-expression-alteration-in-male-androgenetic-alopecia-evidence-of-predominant-molecular-signaling-pathways
#6
L Michel, P Reygagne, P Benech, F Jean-Louis, S Scalvino, S Ly Ka So, Z Hamidou, S Bianovici, J Pouch, B Ducos, M Bonnet, A Bensussan, A Patatian, E Lati, J Wdzieczak-Bakala, J-C Choulot, E Loing, M Hocquaux
BACKGROUND: Male androgenetic alopecia (AGA) is the most common form of hair loss in men and is characterized by a distinct pattern of progressive hair loss starting from the frontal area and the vertex of the scalp. Although several genetic risk loci have been identified, relevant genes for AGA remain to be defined. OBJECTIVES: Herein, molecular biomarkers associated with premature AGA were identified through gene expression analysis using cDNA generated from scalp vertex biopsies of hairless/bald men with premature AGA and healthy volunteers...
April 12, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28402854/in%C3%A2-vivo-interplay-between-p27-kip1-gata3-atoh1-and-pou4f3-converts-non-sensory-cells-to-hair-cells-in-adult-mice
#7
Bradley J Walters, Emily Coak, Jennifer Dearman, Grace Bailey, Tetsuji Yamashita, Bryan Kuo, Jian Zuo
Hearing loss is widespread and persistent because mature mammalian auditory hair cells (HCs) are nonregenerative. In mice, the ability to regenerate HCs from surrounding supporting cells (SCs) declines abruptly after postnatal maturation. We find that combining p27(Kip1) deletion with ectopic ATOH1 expression surmounts this age-related decline, leading to conversion of SCs to HCs in mature mouse cochleae and after noise damage. p27(Kip1) deletion, independent of canonical effects on Rb-family proteins, upregulated GATA3, a co-factor for ATOH1 that is lost from SCs with age...
April 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28393066/signaling-and-transcription-factors-during-inner-ear-development-the-generation-of-hair-cells-and-otic-neurons
#8
Héctor Gálvez, Gina Abelló, Fernando Giraldez
Integration between cell signals and bHLH transcription factors plays a prominent role during the development of hair cells of the inner ear. Hair cells are the sensory receptors of the inner ear, responsible for the mechano-transduction of sound waves into electrical signals. They derive from multipotent progenitors that reside in the otic placode. Progenitor commitment is the result of cell signaling from the surrounding tissues that result in the restricted expression of SoxB1 transcription factors, Sox2 and Sox3...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28388424/repeal-and-replace-adipocyte-regeneration-in-wound-repair
#9
Valerie Horsley, Fiona Watt
Adipocyte precursor cells generate lipid-filled mature adipocytes in multiple tissues during a high-fat diet and in skin during hair follicle growth. In Science, Plikus et al. report that myofibroblasts can generate lipid-filled adipocytes in large skin wounds that regenerate hair follicles, suggesting a new source of adipogenic progenitor cells.
April 6, 2017: Cell Stem Cell
https://www.readbyqxmd.com/read/28387239/survival-of-human-embryonic-stem-cells-implanted-in-the-guinea-pig-auditory-epithelium
#10
Min Young Lee, Sandra Hackelberg, Kari L Green, Kelly G Lunghamer, Takaomi Kurioka, Benjamin R Loomis, Donald L Swiderski, R Keith Duncan, Yehoash Raphael
Hair cells in the mature cochlea cannot spontaneously regenerate. One potential approach for restoring hair cells is stem cell therapy. However, when cells are transplanted into scala media (SM) of the cochlea, they promptly die due to the high potassium concentration. We previously described a method for conditioning the SM to make it more hospitable to implanted cells and showed that HeLa cells could survive for up to a week using this method. Here, we evaluated the survival of human embryonic stem cells (hESC) constitutively expressing GFP (H9 Cre-LoxP) in deaf guinea pig cochleae that were pre-conditioned to reduce potassium levels...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28383465/emerging-therapies-for-sensorineural-hearing-loss
#11
Matthew Gordon Crowson, Ronna Hertzano, Debara L Tucci
OBJECTIVE: To critically review and evaluate the proposed mechanisms and documented results of the therapeutics currently in active clinical drug trials for the treatment of sensorineural hearing loss. DATA SOURCES: US National Institutes of Health (NIH) Clinical Trials registry, MEDLINE/PubMed. STUDY SELECTION & DATA EXTRACTION: A review of the NIH Clinical Trials registry identified candidate hearing loss therapies, and supporting publications were acquired from MEDLINE/PubMed...
April 5, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28368538/combined-deletion-of-the-vitamin-d-receptor-and-calcium-sensing-receptor-delays-wound-re-epithelialization
#12
Yuko Oda, Lizhi Hu, Thai Nguyen, Chak Fong, Chia-Ling Tu, Daniel D Bikle
When the skin is injured, keratinocytes proliferate, migrate, and differentiate to regenerate the epidermis. We recently showed that ablation of the vitamin D receptor (Vdr) in keratinocytes delays wound re-epithelialization in mice also fed a low calcium diet, implicating a cooperative role of Vdr and calcium signaling in this process. In this study we examined the role of vitamin D and calcium signaling in wound healing by deleting their receptors, Vdr and the calcium sensing receptor (Casr). Gene expression profiling of neonatal epidermis lacking both Vdr and Casr (DKO) specifically in keratinocytes revealed that DKO affects a number of pathways relevant to wound healing including Vdr, β-catenin and adherens junction signaling...
March 22, 2017: Endocrinology
https://www.readbyqxmd.com/read/28361315/functional-salivary-gland-regeneration
#13
Miho Ogawa, Takashi Tsuji
The salivary gland plays important roles in maintaining the health and homeostasis of the oral cavity by regulating functions, such as chewing, digestion, cleaning, and swallowing. Salivary gland dysfunction causes dry mouth syndrome, which includes many oral problems, such as dental caries, bacterial infection, mastication dysfunction, and swallowing dysfunction. Therefore, salivary gland regeneration is expected, and we attempted to establish a method by manual approaches. Previously, a novel three-dimensional cell manipulation technique, the "organ germ method," to create a bioengineered organ germ enabled the regeneration of structurally correct and fully functional bioengineered organs, including the teeth, hair follicles, and secretory glands, in vivo...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28361314/functional-hair-follicle-regeneration-by-the-rearrangement-of-stem-cells
#14
Kyosuke Asakawa, Koh-Ei Toyoshima, Takashi Tsuji
Hair follicles develop from the ectoderm in embryos and cyclically regenerate using proper spatiotemporal signaling molecules, which are conserved in organogenesis during adulthood. Previously, we demonstrated that bioengineered hair follicle germs could regenerate functional hair follicles via a three-dimensional cell manipulation technique, which we named the "organ germ method ." We could also regulate the type of hair follicle and pigmentation with correct structures by rearranging the source of the cells...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28351680/human-lung-fibroblast-derived-matrix-facilitates-vascular-morphogenesis-in-3d-environment-and-enhances-skin-wound-healing
#15
Ping Du, Muhammad Suhaeri, Sang Su Ha, Seung Ja Oh, Sang Heon Kim, Kwideok Park
Extracellular matrix (ECM) is crucial to many aspects of vascular morphogenesis and maintenance of vasculature function. Currently the recapitulation of angiogenic ECM microenvironment is still challenging, due mainly to its diverse components and complex organization. Here we investigate the angiogenic potential of human lung fibroblast-derived matrix (hFDM) in creating a three-dimensional (3D) vascular construct. hFDM was obtained via decellularization of in vitro cultured human lung fibroblasts and analyzed via immunofluorescence staining and ELISA, which detect multiple ECM macromolecules and angiogenic growth factors (GFs)...
March 25, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28350869/in-vitro-skin-models-to-study-epithelial-regeneration-from-the-hair-follicle
#16
Nkemcho Ojeh, Baki Akgül, Marjana Tomic-Canic, Mike Philpott, Harshad Navsaria
The development of dermal equivalents (DEs) for the treatment of burns has contributed toward efficient wound closure. A collagen-glycosaminoglycan DE (C-GAG) grafted with hair follicles converted a full-thickness wound to partial-thickness resulting in complete wound closure and restored hair. In this study we compared the ability of both intact pilosebaceous units (PSU) or truncated hair follicles (THF) to regenerate a multilayered epidermis in vitro when implanted into de-epidermalized dermis (DED) or C-GAG with the epidermis generated in vivo using C-CAG...
2017: PloS One
https://www.readbyqxmd.com/read/28350294/mechanotransduction-current-is-essential-for-stability-of-the-transducing-stereocilia-in-mammalian-auditory-hair-cells
#17
A Catalina Vélez-Ortega, Mary J Freeman, Artur A Indzhykulian, Jonathan M Grossheim, Gregory I Frolenkov
Mechanotransducer channels at the tips of sensory stereocilia of inner ear hair cells are gated by the tension of 'tip links' interconnecting stereocilia. To ensure maximal sensitivity, tip links are tensioned at rest, resulting in a continuous influx of Ca(2+) into the cell. Here we show that this constitutive Ca(2+) influx, usually considered as potentially deleterious for hair cells, is in fact essential for stereocilia stability. In the auditory hair cells of young postnatal mice and rats, a reduction in mechanotransducer current, via pharmacological channel blockers or disruption of tip links, leads to stereocilia shape changes and shortening...
March 28, 2017: ELife
https://www.readbyqxmd.com/read/28348517/inhibition-of-h3k27me3-histone-demethylase-activity-prevents-the-proliferative-regeneration-of-zebrafish-lateral-line-neuromasts
#18
Beier Bao, Yingzi He, Dongmei Tang, Wenyan Li, Huawei Li
The H3K27 demethylases are involved in a variety of biological processes, including cell differentiation, proliferation, and cell death by regulating transcriptional activity. However, the function of H3K27 demethylation in the field of hearing research is poorly understood. Here, we investigated the role of H3K27me3 histone demethylase activity in hair cell regeneration using an in vivo animal model. Our data showed that pharmacologic inhibition of H3K27 demethylase activity with the specific small-molecule inhibitor GSK-J4 decreased the number of regenerated hair cells in response to neomycin damage...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28345588/macrophages-induce-akt-%C3%AE-catenin-dependent-lgr5-stem-cell-activation-and-hair-follicle-regeneration-through-tnf
#19
Xusheng Wang, Haiyan Chen, Ruiyun Tian, Yiling Zhang, Marina S Drutskaya, Chengmei Wang, Jianfeng Ge, Zhimeng Fan, Deqiang Kong, Xiaoxiao Wang, Ting Cai, Ying Zhou, Jingwen Wang, Jinmei Wang, Shan Wang, Zhihai Qin, Huanhuan Jia, Yue Wu, Jia Liu, Sergei A Nedospasov, Edward E Tredget, Mei Lin, Jianjun Liu, Yuyang Jiang, Yaojiong Wu
Skin stem cells can regenerate epidermal appendages; however, hair follicles (HF) lost as a result of injury are barely regenerated. Here we show that macrophages in wounds activate HF stem cells, leading to telogen-anagen transition (TAT) around the wound and de novo HF regeneration, mostly through TNF signalling. Both TNF knockout and overexpression attenuate HF neogenesis in wounds, suggesting dose-dependent induction of HF neogenesis by TNF, which is consistent with TNF-induced AKT signalling in epidermal stem cells in vitro...
March 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28337222/a-conditioned-medium-of-umbilical-cord-mesenchymal-stem-cells-overexpressing-wnt7a-promotes-wound-repair-and-regeneration-of-hair-follicles-in-mice
#20
Liang Dong, Haojie Hao, Jiejie Liu, Dongdong Ti, Chuan Tong, Qian Hou, Meirong Li, Jingxi Zheng, Gang Liu, Xiaobing Fu, Weidong Han
Mesenchymal stem cells (MSCs) can affect the microenvironment of a wound and thereby accelerate wound healing. Wnt proteins act as key mediators of skin development and participate in the formation of skin appendages such as hair. The mechanisms of action of MSCs and Wnt proteins on skin wounds are largely unknown. Here, we prepared a Wnt7a-containing conditioned medium (Wnt-CM) from the supernatant of cultured human umbilical cord-MSCs (UC-MSCs) overexpressing Wnt7a in order to examine the effects of this CM on cutaneous healing...
2017: Stem Cells International
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