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https://www.readbyqxmd.com/read/27908934/gata6-promotes-hair-follicle-progenitor-cell-renewal-by-genome-maintenance-during-proliferation
#1
Alex B Wang, Ying V Zhang, Tudorita Tumbar
Cell proliferation is essential to rapid tissue growth and repair, but can result in replication-associated genome damage. Here, we implicate the transcription factor Gata6 in adult mouse hair follicle regeneration where it controls the renewal of rapidly proliferating epithelial (matrix) progenitors and hence the extent of production of terminally differentiated lineages. We find that Gata6 protects against DNA damage associated with proliferation, thus preventing cell cycle arrest and apoptosis. Furthermore, we show that in vivo Gata6 stimulates EDA-receptor signaling adaptor Edaradd level and NF-κB pathway activation, known to be important for DNA damage repair and stress response in general and for hair follicle growth in particular...
December 1, 2016: EMBO Journal
https://www.readbyqxmd.com/read/27898044/dna-damage-inducible-transcript-4-is-an-innate-surveillant-of-hair-follicular-stress-in-vitamin-d-receptor-knockout-mice-and-a-regulator-of-wound-re-epithelialization
#2
Hengguang Zhao, Sandra Rieger, Koichiro Abe, Martin Hewison, Thomas S Lisse
Mice and human patients with impaired vitamin D receptor (VDR) signaling have normal developmental hair growth but display aberrant post-morphogenic hair cycle progression associated with alopecia. In addition, VDR(-/-) mice exhibit impaired cutaneous wound healing. We undertook experiments to determine whether the stress-inducible regulator of energy homeostasis, DNA damage-inducible transcript 4 (Ddit4), is involved in these processes. By analyzing hair cycle activation in vivo, we show that VDR(-/-) mice at day 14 exhibit increased Ddit4 expression within follicular stress compartments...
November 26, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27864061/melanogenesis-inhibits-respiration-in-b16-f10-melanoma-cells-whereas-enhances-mitochondrial-cell-content
#3
Willian Vanderlei Meira, Tassiele Andréa Heinrich, Silvia Maria Suter Correia Cadena, Glaucia Regina Martinez
Melanoma is a rare and aggressive skin tumor; the survival of patients diagnosed late is fairly low. This high mortality rate is due to the characteristics of the cells that allow them to be resistant to radiotherapy and conventional chemotherapy, besides of being able to evade the immune system. Melanin, the pigment responsible for skin, hair and eye color, seems to be involved in this resistance. The main function of melanin is to protect the cells against ultraviolet (UV) light by absorbing this radiation and reactive oxygen species (ROS) scavenging...
November 15, 2016: Experimental Cell Research
https://www.readbyqxmd.com/read/27837456/cycling-cd34-expression-in-subpopulations-of-head-and-neck-squamous-cell-carcinoma-cell-lines-is-involved-in-radioresistance-and-change-in-cytokeratin-expression-profile
#4
Tobias Ettl, Matthias Hautmann, Torsten E Reichert, Richard Bauer
The expression of the hair follicle stem cell marker CD34 was analyzed in five different head and neck squamous cell carcinoma (HNSCC) cell lines with different antibodies. All HNSCC cell lines expressed CD34 on their cell surface. After cell cycle synchronization via serum starvation, we observed cyclic CD34 expression in HNSCC cells dependent on cell cycle progression via immunofluorescent staining and flow cytometric analysis. Investigation of the CD34(+) and CD34(-) HNSCC populations revealed most of the cells in S-phase and G2/M-Phase in CD34(+) cells in contrast to CD34(-) cells...
November 11, 2016: Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/27836242/affective-correlates-of-trichotillomania-across-the-pulling-cycle-findings-from-an-italian-sample-of-self-identified-hair-pullers
#5
Gioia Bottesi, Silvia Cerea, Allison J Ouimet, Claudio Sica, Marta Ghisi
Etiological models of trichotillomania (TTM) conceptualize hair pulling as a dysfunctional emotion regulation strategy; accordingly, some research has found that affective states change differentially across the hair pulling cycle. We explored emotional changes in a sample of Italian individuals reporting TTM. Eighty-nine participants reporting TTM completed a 12-item section of the Italian Hair Pulling Questionnaire online and rated the extent to which they had experienced 12 affective states before, during, and after hair pulling...
November 4, 2016: Psychiatry Research
https://www.readbyqxmd.com/read/27833853/mouse-specific-up-regulation-of-ccnb1-expression-by-mir-199a-5p-in-keratinocyte
#6
Bong-Kyu Kim, Injung Kim, Ah-Reum Lee, Hye-In Yoo, Sungjoo Kim Yoon
MicroRNA (miRNA) are a class of single-stranded, small non-coding RNA that regulate various biological processes, including skin and hair cycle regulation, by modulating the expression of specific genes at the post-transcriptional level. Recently, several studies reported that miRNA directly or indirectly up-regulate target genes. Previously, we performed microarray analysis to identify the target genes of miR-199a-5p in a mouse skin keratinocyte cell line and detected more than 200 genes whose expression was significantly increased by miR-199a-5p overexpression (> 1...
November 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/27829454/prolactin-related-symptoms-during-risperidone-maintenance-treatment-results-from-a-prospective-multicenter-study-of-schizophrenia
#7
Qijing Bo, Fang Dong, Xianbin Li, Zhimin Wang, Xin Ma, Chuanyue Wang
BACKGROUND: This study aimed to investigate prolactin related symptoms (PRS) in individuals with schizophrenia during risperidone maintenance treatment for one year, as well as to identify the risk factors for PRS. METHODS: In a multicenter, randomized, controlled, longitudinal study, clinically stabilized schizophrenia patients (N = 374) were randomized to a no-dose-reduction group (N = 129) and 4-week (N = 125) and 26-week (N = 120) reduction groups, in which the original dose was followed by a 50 % reduction over 8 weeks and subsequently maintained...
November 9, 2016: BMC Psychiatry
https://www.readbyqxmd.com/read/27811685/phasmarhabditis-bonaquaense-n-sp-nematoda-rhabditidae-a-new-slug-parasitic-nematode-from-the-czech-republic
#8
Jiří Nermuť, Vladimír Půža, Tesfamariam Mekete, Zdeněk Mráček
Phasmarhabditis bonaquaense n. sp. is described and illustrated from the body of Malacolimax tenellus, from the locality of České Švýcary near the village of Dobrá Voda, the Czech Republic. Females are characterized by a body length of 2349 (1878-2626) µm and a cupola shaped tail with a long hyaline hair-like tail tip. Extremely prominent papilla-like phasmids present. Males 1829 (1414-2121) µm long. Peloderan bursa with nine pairs of rays (papillae), 1/1/1/2/1/3. One non-paired apparent papilla-like structure located near the ventral appendage anterior to the cloaca...
October 31, 2016: Zootaxa
https://www.readbyqxmd.com/read/27797819/bimodal-behaviour-of-interfollicular-epidermal-progenitors-regulated-by-hair-follicle-position-and-cycling
#9
Edwige Roy, Zoltan Neufeld, Luca Cerone, Ho Yi Wong, Samantha Hodgson, Jean Livet, Kiarash Khosrotehrani
Interfollicular epidermal (IFE) homeostasis is a major physiological process allowing maintenance of the skin barrier function. Despite progress in our understanding of stem cell populations in different hair follicle compartments, cellular mechanisms of IFE maintenance, in particular, whether a hierarchy of progenitors exists within this compartment, have remained controversial. We here used multicolour lineage tracing with Brainbow transgenic labels activated in the epidermis to track individual keratinocyte clones...
October 21, 2016: EMBO Journal
https://www.readbyqxmd.com/read/27772548/jak-stat-signaling-jump-starts-the-hair-cycle
#10
Etienne Wang, Sivan Harel, Angela M Christiano
Legrand et al show that JAK/STAT5 signaling in the dermal papilla is required for anagen onset in the murine hair cycle. Interestingly, others have shown that JAK-inhibition is able to induce telogen-to-anagen transition in wild-type mice. This apparent contradiction highlights the complexity of interactions within the hair follicle, and encourages further discussion on the role of JAK-STAT signaling in the various stem cell niches of the hair follicle.
November 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27771230/sox9-facilitates-proliferation-differentiation-and-lipogenesis-in-primary-cultured-human-sebocytes
#11
Ge Shi, Ting-Ting Wang, Juan-Hua Quan, Shi-Jie Li, Man-Feng Zhang, Pei-Yu Liao, Yi-Ming Fan
BACKGROUND: The transcription factor Sox9 is pivotal in the morphogenesis of hair follicles, but its role in sebocytes is poorly understood. OBJECTIVE: We investigated the effect of Sox9 on human sebocyte proliferation, differentiation and lipogenesis. METHODS: Sox9 expression was detected by immunohistochemistry in normal skin and acne lesion. Primary cultured human sebocytes were transfected with adenovirus expressing GFP-Sox9 or Sox9 microRNA...
October 13, 2016: Journal of Dermatological Science
https://www.readbyqxmd.com/read/27769845/calpain-12-function-revealed-through-the-study-of-an-atypical-case-of-autosomal-recessive-congenital-ichthyosis
#12
Ron Bochner, Liat Samuelov, Ofer Sarig, Qiaoli Li, Christopher A Adase, Ofer Isakov, Natalia Malchin, Dan Vodo, Ronna Shayevitch, Alon Peled, Benjamin D Yu, Gilad Fainberg, Emily Warshauer, Noam Adir, Noam Erez, Andrea Gat, Yehonatan Gottlieb, Tova Rogers, Mor Pavlovsky, Ilan Goldberg, Noam Shomron, Aileen Sandilands, Linda E Campbell, Stephanie MacCallum, W H Irwin McLean, Gil Ast, Richard L Gallo, Jouni Uitto, Eli Sprecher
Congenital erythroderma is a rare and often life-threatening condition, which has been shown to result from mutations in several genes encoding important components of the epidermal differentiation program. Using whole exome sequencing, we identified in a child with congenital exfoliative erythroderma, hypotrichosis, severe nail dystrophy and failure to thrive, two heterozygous mutations in ABCA12 (c.2956C>T, p.R986W; c.5778+2T>C, p. G1900Mfs*16), a gene known to be associated with 2 forms of ichthyosis, autosomal recessive congenital ichthyosis and harlequin ichthyosis...
October 18, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27766947/vascular-endothelial-growth-factor-vegfa-gene-variation-in-polycystic-ovary-syndrome-in-a-tunisian-women-population
#13
Assila Ben Salem, Fatma Megdich, Olfa Kacem, Malek Souayeh, Faten Hachani Ben Ali, Sondes Hizem, Faouzi Janhai, Mounir Ajina, Muhammad Abu-Elmagd, Mourad Assidi, Mohammed H Al Qahtani, Touhami Mahjoub
BACKGROUND: Polycystic ovary syndrome (PCOS) is characterized by the growth of a number of small cysts on the ovaries which leads to sex hormonal imbalance. Women who are affected by this syndrome suffer from irregular menstrual cycles, decline in their fertility, excessive hair growth, obesity, acne and most importantly cardiac function problems. The vascular endothelial growth factor (VEGF) plays a pivotal role in tissue vascularization in general and in the pathogenesis of many diseases...
October 17, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27760366/two-tone-suppression-of-simultaneous-electrical-and-mechanical-responses-in-the-cochlea
#14
Wei Dong, Elizabeth S Olson
Cochlear frequency tuning is based on a mildly tuned traveling-wave response that is enhanced in amplitude and sharpness by outer hair cell (OHC)-based forces. The nonlinear and active character of this enhancement is the fundamental manifestation of cochlear amplification. Recently, mechanical (pressure) and electrical (extracellular OHC-generated voltage) responses were simultaneously measured close to the sensory tissue's basilar membrane. Both pressure and voltage were tuned and showed traveling-wave phase accumulation, evidence that they were locally generated responses...
October 18, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27754889/the-zebrafish-homologs-of-set-i2pp2a-oncoprotein-expression-patterns-and-insights-into-their-physiological-roles-during-development
#15
Iliana Serifi, Eleni Tzima, Katerina Soupsana, Zoe Karetsou, Dimitris Beis, Thomais Papamarcaki
The oncoprotein SET/I2PP2A participates in various cellular mechanisms such as transcription, cell cycle regulation and cell migration. SET is also an inhibitor of the serine/threonine phosphatase PP2A, which is involved in the regulation of cell homeostasis. In zebrafish there are two paralogous set genes that encode Seta (269 aa) and Setb (275 aa) proteins which share 94% identity. We show here that seta and set b are similarly expressed in the eye, the otic vesicle, the brain and the lateral line system, as indicated by in situ hybridization labeling...
October 17, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27746829/influence-of-hormonal-changes-on-audiologic-examination-in-normal-ovarian-cycle-females-an-analytic-study
#16
Indri Adriztina, Adlin Adnan, Ichwanul Adenin, Siti Hajar Haryuna, Sorimuda Sarumpaet
Introduction There is only limited information from previous studies that suggest that auditory function may be influenced by hormones. Recent advances in the field have exposed the potential role of hormones in modulating the auditory system. Objective This study aims to investigate the relationship between menstrual cycle and outer hair cell function with audiological examination. Methods This is an analytic study with a cross-sectional design. The sampling was a systematic random sampling. We found 49 women with normal menstrual cycle and collected their data through interviews, physical examination, and examination of the ear, with otoscopic and other routine otorhinolaryngology examinations...
October 2016: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/27746640/acute-stress-induced-changes-in-follicular-dermal-papilla-cells-and-mobilization-of-mast-cells-implications-for-hair-growth
#17
Hyoseung Shin, Soon-Jin Choi, A-Ri Cho, Dong Young Kim, Kyu Han Kim, Ohsang Kwon
BACKGROUND: Stress is a known cause of hair loss in many species. OBJECTIVE: In this study, we investigated the role of acute stress on hair growth using a rat model. METHODS: Rats were immobilized for 24 hours and blood samples, and skin biopsies were taken. The effect of stress-serum on the in vitro proliferation of rat and human dermal papilla cells (hDPCs), as well as serum cortisol and corticotropin-releasing hormone levels, were measured...
October 2016: Annals of Dermatology
https://www.readbyqxmd.com/read/27746638/repeated-microneedle-stimulation-induces-enhanced-hair-growth-in-a-murine-model
#18
Yoon Seob Kim, Kwan Ho Jeong, Jung Eun Kim, Young Jun Woo, Beom Joon Kim, Hoon Kang
BACKGROUND: Microneedle is a method that creates transdermal microchannels across the stratum corneum barrier layer of skin. No previous study showed a therapeutic effect of microneedle itself on hair growth by wounding. OBJECTIVE: The aim of this study is to investigate the effect of repeated microwound formed by microneedle on hair growth and hair growth-related genes in a murine model. METHODS: A disk microneedle roller was applied to each group of mice five times a week for three weeks...
October 2016: Annals of Dermatology
https://www.readbyqxmd.com/read/27718775/breaking-the-cycle-of-hair-breakage-pearls-for-the-management-of-acquired-trichorrhexis-nodosa
#19
Alessandra Haskin, Shawn G Kwatra, Crystal Aguh
Acquired trichorrhexis nodosa is a common cause of hair loss for patients of all ethnicities. It is especially prevalent in black patients with tightly curled hair types and can present unique diagnostic and therapeutic challenges due to structural differences in these hair types and the combination of various hair care and styling practices that contribute to hair damage. While scalp biopsies can help rule out other etiologies of hair loss, there is a paucity of histologic findings in acquired trichorrhexis nodosa, making this primarily a clinical diagnosis...
October 10, 2016: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/27715423/regeneration-of-murine-hair-follicles-is-inhibited-by-low-dose-rate-gamma-irradiation
#20
Kimihiko Sugaya, Tomohisa Hirobe, Yoshie Ishihara, Sonoe Inoue
To determine whether the effects of low-dose-rate gamma (γ) irradiation are identifiable in the regeneration of murine hair follicles, we irradiated whole bodies of C57BL/10JHir mice in the first telogen phase of the hair cycle with (137)Cs γ-rays. The mice were examined for effects on hair follicles, including number, morphology, and pigmentation in the second anagen phase. Effects of γ-radiation on melanocyte stem cells were also investigated by the indirect immunolabeling of tyrosinase-related protein 2 (TRP2)...
October 2016: Zoological Science
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