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Hair cell regeneration

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https://www.readbyqxmd.com/read/28727410/exosomes-mediate-epithelium-mesenchyme-crosstalk-in-organ-development
#1
Nan Jiang, Lusai Xiang, Ling He, Guodong Yang, Jinxuan Zheng, Chenglin Wang, Yimei Zhang, Sainan Wang, Yue Zhou, Tzong-Jen Sheu, Jiaqian Wu, Kenian Chen, Paulo G Coelho, Nicky M Tovar, Shin Hye Kim, Mo Chen, Yan-Heng Zhou, Jeremy J Mao
Organ development requires complex signaling by cells in different tissues. Epithelium and mesenchyme interactions are crucial for the development of the skin, hair follicles, kidney, lungs, prostate, major glands and the teeth. Despite myriad literature on cell-cell interactions and ligand-receptor binding, the roles extracellular vesicles in epithelium-mesenchyme interactions during organogenesis are poorly understood. Here, we discovered that ~100 nm exosomes were secreted by the epithelium and mesenchyme of a developing tooth organ, and diffused through the basement membrane...
July 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28725177/characterization-of-lgr5-progenitor-cell-transcriptomes-after-neomycin-injury-in-the-neonatal-mouse-cochlea
#2
Shasha Zhang, Yuan Zhang, Pengfei Yu, Yao Hu, Han Zhou, Lingna Guo, Xiaochen Xu, Xiaocheng Zhu, Muhammad Waqas, Jieyu Qi, Xiaoli Zhang, Yan Liu, Fangyi Chen, Mingliang Tang, Xiaoyun Qian, Haibo Shi, Xia Gao, Renjie Chai
Lgr5+ supporting cells (SCs) are enriched hair cell (HC) progenitors in the cochlea. Both in vitro and in vivo studies have shown that HC injury can spontaneously activate Lgr5+ progenitors to regenerate HCs in the neonatal mouse cochlea. Promoting HC regeneration requires the understanding of the mechanism of HC regeneration, and this requires knowledge of the key genes involved in HC injury-induced self-repair responses that promote the proliferation and differentiation of Lgr5+ progenitors. Here, as expected, we found that neomycin-treated Lgr5+ progenitors (NLPs) had significantly greater HC regeneration ability, and greater but not significant proliferation ability compared to untreated Lgr5+ progenitors (ULPs) in response to neomycin exposure...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28699278/regulatory-t-cells-in-skin
#3
REVIEW
Niwa Ali, Michael D Rosenblum
Foxp3+ CD4+ Regulatory T cells (Tregs) are a subset of immune cells that function to regulate tissue inflammation. Skin is one of the largest organs and is home to a large proportion of the body's Tregs. However, relative to other tissues (such as the spleen and gastrointestinal tract) the function of Tregs in skin is less well defined. Here, we review our understanding of how Tregs migrate to skin and the cellular and molecular pathways required for their maintenance in this tissue. In addition, we outline what is known about the specialized functions of Tregs in skin...
July 12, 2017: Immunology
https://www.readbyqxmd.com/read/28697631/recent-advances-on-biomedical-applications-of-scaffolds-in-wound-healing-and-dermal-tissue-engineering
#4
Azizeh Rahmani Del Bakhshayesh, Nasim Annabi, Rovshan Khalilov, Abolfazl Akbarzadeh, Mohammad Samiei, Effat Alizadeh, Mohammadreza Alizadeh-Ghodsi, Soodabeh Davaran, Azadeh Montaseri
The tissue engineering field has developed in response to the shortcomings related to the replacement of the tissues lost to disease or trauma: donor tissue rejection, chronic inflammation and donor tissue shortages. The driving force behind the tissue engineering is to avoid the mentioned issues by creating the biological substitutes capable of replacing the damaged tissue. This is done by combining the scaffolds, cells and signals in order to create the living, physiological, three-dimensional tissues. A wide variety of skin substitutes are used in the treatment of full-thickness injuries...
July 12, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28689433/experimental-and-early-investigational-drugs-for-androgenetic-alopecia
#5
Hongwei Guo, Wendi Victor Gao, Hiromi Endo, Kevin John McElwee
Treatments for androgenetic alopecia constitute a multi-billion-dollar industry, however, currently available therapeutic options have variable efficacy. Consequently, in recent years small biotechnology companies and academic research laboratories have begun to investigate new or improved treatment methods. Research and development approaches include improved formulations and modes of application for current drugs, new drug development, development of cell-based treatments, and medical devices for modulation of hair growth...
July 12, 2017: Expert Opinion on Investigational Drugs
https://www.readbyqxmd.com/read/28686713/transcriptome-wide-comparison-of-the-impact-of-atoh1-and-mir-183-family-on-pluripotent-stem-cells-and-multipotent-otic-progenitor-cells
#6
Michael Ebeid, Prashanth Sripal, Jason Pecka, Kirk W Beisel, Kelvin Kwan, Garrett A Soukup
Over 5% of the global population suffers from disabling hearing loss caused by multiple factors including aging, noise exposure, genetic predisposition, or use of ototoxic drugs. Sensorineural hearing loss is often caused by the loss of sensory hair cells (HCs) of the inner ear. A barrier to hearing restoration after HC loss is the limited ability of mammalian auditory HCs to spontaneously regenerate. Understanding the molecular mechanisms orchestrating HC development is expected to facilitate cell replacement therapies...
2017: PloS One
https://www.readbyqxmd.com/read/28682135/using-zebrafish-as-a-model-to-study-the-role-of-epigenetics-in-hearing-loss
#7
Yingzi He, Beier Bao, Huawei Li
The rapid progress of bioinformatics and high-throughput screening techniques in recent years has led to the identification of many candidate genes and small-molecule drugs that have the potential to make significant contributions to our understanding of the developmental and pathological processes of hearing, but it remains unclear how these genes and regulatory factors are coordinated. Increasing evidence suggests that epigenetic mechanisms are essential for establishing gene expression profiles and likely play an important role in the development of inner ear and in the pathology of hearing-associated diseases...
July 6, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/28672008/nanofibrous-scaffolds-for-the-guidance-of-stem-cell-derived-neurons-for-auditory-nerve-regeneration
#8
Sandra Hackelberg, Samuel J Tuck, Long He, Arjun Rastogi, Christina White, Liqian Liu, Diane M Prieskorn, Ryan J Miller, Che Chan, Benjamin R Loomis, Joseph M Corey, Josef M Miller, R Keith Duncan
Impairment of spiral ganglion neurons (SGNs) of the auditory nerve is a major cause for hearing loss occurring independently or in addition to sensory hair cell damage. Unfortunately, mammalian SGNs lack the potential for autonomous regeneration. Stem cell based therapy is a promising approach for auditory nerve regeneration, but proper integration of exogenous cells into the auditory circuit remains a fundamental challenge. Here, we present novel nanofibrous scaffolds designed to guide the integration of human stem cell-derived neurons in the internal auditory meatus (IAM), the foramen allowing passage of the spiral ganglion to the auditory brainstem...
2017: PloS One
https://www.readbyqxmd.com/read/28670819/emerging-roles-of-transit-amplifying-cells-in-tissue-regeneration-and-cancer
#9
REVIEW
Bing Zhang, Ya-Chieh Hsu
Most regenerative tissues employ transit-amplifying cells (TACs) that are positioned in between stem cells and differentiated progeny. In a classical hierarchical model, stem cells undergo limited divisions to produce TACs, which then proliferate rapidly to expand the system and produce diverse differentiated cell types. Although TACs are indispensable for generating tissues, they have been largely viewed as a transit point between stem cells and downstream lineages. Studies in the past few years, however, have revealed some fascinating biology and unanticipated functions of TACs...
July 3, 2017: Wiley Interdisciplinary Reviews. Developmental Biology
https://www.readbyqxmd.com/read/28669599/inactivation-of-stat3-signaling-impairs-hair-cell-differentiation-in%C3%A2-the%C3%A2-developing-mouse-cochlea
#10
Qianqian Chen, Yizhou Quan, Naitao Wang, Chengying Xie, Zhongzhong Ji, Hao He, Renjie Chai, Huawei Li, Shankai Yin, Y Eugene Chin, Xunbin Wei, Wei-Qiang Gao
Although STAT3 signaling is demonstrated to regulate sensory cell differentiation and regeneration in the zebrafish, its exact role is still unclear in mammalian cochleae. Here, we report that STAT3 and its activated form are specifically expressed in hair cells during mouse cochlear development. Importantly, conditional cochlear deletion of Stat3 leads to an inhibition on hair cell differentiation in mice in vivo and in vitro. By cell fate analysis, inactivation of STAT3 signaling shifts the cell division modes from asymmetric to symmetric divisions from supporting cells...
July 11, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28655873/synergistic-effect-of-human-bone-morphogenic-protein-2-and-mesenchymal-stromal-cells-on-chronic-wounds-through-hypoxia-inducible-factor-1-%C3%AE-induction
#11
Sabine François, Véronique V Eder, Karim Belmokhtar, Marie-Christine Machet, Luc Douay, Norbert-Claude Gorin, Marc Benderitter, Chapel A Alain
Chronic skin ulcers and burns require advanced treatments. Mesenchymal Stromal Cells (MSCs) are effective in treating these pathologies. Bone Morphogenic Protein-2 (BMP-2) is known to enhance angiogenesis. We investigated whether recombinant human hBMP-2 potentiates the effect of MSCs on wound healing. Severe ulceration was induced in rats by irradiation and treated by co-infusion of MSCs with hBMP-2 into the ulcerated area which accelerated wound healing. Potentiation of the effect of MSCs by hBMP-2 on endothelial repair improved skin healing...
June 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28646272/rhesus-cochlear-and-vestibular-functions-are-preserved-after-inner-ear-injection-of-saline-volume-sufficient-for-gene-therapy-delivery
#12
Chenkai Dai, Mohamed Lehar, Daniel Q Sun, Lani Swarthout Rvt, John P Carey, Tim MacLachlan, Doug Brough, Hinrich Staecker, Alexandra M Della Santina, Timothy E Hullar, Charles C Della Santina
Sensorineural losses of hearing and vestibular sensation due to hair cell dysfunction are among the most common disabilities. Recent preclinical research demonstrates that treatment of the inner ear with a variety of compounds, including gene therapy agents, may elicit regeneration and/or repair of hair cells in animals exposed to ototoxic medications or other insults to the inner ear. Delivery of gene therapy may also offer a means for treatment of hereditary hearing loss. However, injection of a fluid volume sufficient to deliver an adequate dose of a pharmacologic agent could, in theory, cause inner ear trauma that compromises functional outcome...
June 23, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28636968/t-regulating-hair-follicle-stem-cells
#13
Maria Maryanovich, Paul S Frenette
Regulatory T (Treg) cells are well known to modulate inflammatory responses. In a recent issue of Cell, Ali et al. (2017) reveal a function for Treg cells in stem cell maintenance by showing that skin-resident Foxp3(+) Treg cells preferentially localize to the hair follicle stem cell (HFSC) niche to control HFSC-mediated hair regeneration.
June 20, 2017: Immunity
https://www.readbyqxmd.com/read/28627318/effects-of-gamma-rays-on-the-regeneration-of-murine-hair-follicles-in-the-natural-hair-cycle
#14
Kimihiko Sugaya
PURPOSE: This review evaluates the effects of γ-rays on the regeneration of murine hair follicles in the natural hair cycle. A series of studies were performed to investigate this issue, in which the whole bodies of C57BL/10JHir mice in the 1st telogen phase of the hair cycle were irradiated with γ-rays. RESULTS: The dermis of the irradiated skin showed a decrease in hair follicle density and induction of curved hair follicles along with the presence of white hairs and hypopigmented hair bulbs in the 2nd and 3rd anagen phases...
July 7, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28616244/macrophages-and-fibroblasts-during-inflammation-and-tissue-repair-in-models-of-organ-regeneration
#15
REVIEW
Anthony L Mescher
This review provides a concise summary of the changing phenotypes of macrophages and fibroblastic cells during the local inflammatory response, the onset of tissue repair, and the resolution of inflammation which follow injury to an organ. Both cell populations respond directly to damage and present coordinated sequences of activation states which determine the reparative outcome, ranging from true regeneration of the organ to fibrosis and variable functional deficits. Recent work with mammalian models of organ regeneration, including regeneration of full-thickness skin, hair follicles, ear punch tissues, and digit tips, is summarized and the roles of local immune cells in these systems are discussed...
April 2017: Regeneration
https://www.readbyqxmd.com/read/28614369/unlocking-the-vital-role-of-host-cells-in-hair-follicle-reconstruction-by-semi-permeable-capsules
#16
Zhexiang Fan, Yong Miao, Qian Qu, Shune Xiao, Jin Wang, Lijuan Du, Bingcheng Liu, Zhiqi Hu
Organ regeneration is becoming a promising choice for many patients; however, many details about the mechanisms underlying organ regeneration remain unknown. As regenerative organs, hair follicles offer a good model to study the mechanisms associated with regenerative medicine. The relevant studies have mainly focused on donor cells, and there are no systematic studies involving the effect of host factors on hair follicle reconstruction. Thus, we intend to explore the effect of host cells on hair follicle reconstruction...
2017: PloS One
https://www.readbyqxmd.com/read/28599846/planar-cell-polarity-dependent-and-independent-functions-in-the-emergence-of-tissue-scale-hair-follicle-patterns
#17
Maureen Cetera, Liliya Leybova, Frank W Woo, Michael Deans, Danelle Devenport
Hair follicles of the mammalian epidermis display local order and global alignment, a complex pattern instructed by the core planar cell polarity (PCP) pathway. Here we address the contributions of core PCP genes, Van Gogh-like and Frizzled, to the establishment, local refinement, and global order of embryonic and postnatal hair follicles. We find that, similar to Fz6 mutants, the disordered hair patterns of Vangl2 mutants are refined over time and eventually corrected. In both mutants, we find that tissue-level reorientation occurs through locally coordinated follicle rotation at stereotyped locations...
August 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28595998/targeting-of-cxxc5-by-a-competing-peptide-stimulates-hair-re-growth-and-wound-induced-hair-neogenesis
#18
Soung-Hoon Lee, Seol Hwa Seo, Dong-Hwan Lee, Long-Quan Pi, Won-Soo Lee, Kang-Yell Choi
The Wnt/β-catenin pathway has been implicated in hair follicle development and hair regeneration in adults. We discovered that CXXC-type zinc finger protein 5 (CXXC5) is a negative regulator of the Wnt/β-catenin pathway involved in hair re-growth and wound-induced hair follicle neogenesis (WIHN) via an interaction with Dishevelled (Dvl). CXXC5 was up-regulated in miniaturized hair follicles and arrector pili muscles in human balding scalps. The inhibitory effects of CXXC5 on alkaline phosphatase activity and cell proliferation were demonstrated using human hair follicle dermal papilla cells...
June 5, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28553937/stem-cell-plasticity-enables-hair-regeneration-following-lgr5-cell-loss
#19
Joerg D Hoeck, Brian Biehs, Antonina V Kurtova, Noelyn M Kljavin, Felipe de Sousa E Melo, Bruno Alicke, Hartmut Koeppen, Zora Modrusan, Robert Piskol, Frederic J de Sauvage
Under injury conditions, dedicated stem cell populations govern tissue regeneration. However, the molecular mechanisms that induce stem cell regeneration and enable plasticity are poorly understood. Here, we investigate stem cell recovery in the context of the hair follicle to understand how two molecularly distinct stem cell populations are integrated. Utilizing diphtheria-toxin-mediated cell ablation of Lgr5(+) (leucine-rich repeat-containing G-protein-coupled receptor 5) stem cells, we show that killing of Lgr5(+) cells in mice abrogates hair regeneration but this is reversible...
June 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28552347/regulatory-t-cells-in-skin-facilitate-epithelial-stem-cell-differentiation
#20
Niwa Ali, Bahar Zirak, Robert Sanchez Rodriguez, Mariela L Pauli, Hong-An Truong, Kevin Lai, Richard Ahn, Kaitlin Corbin, Margaret M Lowe, Tiffany C Scharschmidt, Keyon Taravati, Madeleine R Tan, Roberto R Ricardo-Gonzalez, Audrey Nosbaum, Marta Bertolini, Wilson Liao, Frank O Nestle, Ralf Paus, George Cotsarelis, Abul K Abbas, Michael D Rosenblum
The maintenance of tissue homeostasis is critically dependent on the function of tissue-resident immune cells and the differentiation capacity of tissue-resident stem cells (SCs). How immune cells influence the function of SCs is largely unknown. Regulatory T cells (Tregs) in skin preferentially localize to hair follicles (HFs), which house a major subset of skin SCs (HFSCs). Here, we mechanistically dissect the role of Tregs in HF and HFSC biology. Lineage-specific cell depletion revealed that Tregs promote HF regeneration by augmenting HFSC proliferation and differentiation...
June 1, 2017: Cell
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