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https://www.readbyqxmd.com/read/29240822/acne-keloidalis-nuchae-in-asian-a-single-institutional-experience
#1
Kiyong Na, Sang Ho Oh, Sang Kyum Kim
Acne keloidalis nuchae, a type of folliculitis involving the back of the neck, is common in black men, although rare cases have been reported in patients of other ethnicities. We analyzed the clinicopathological features of acne keloidalis nuchae in 17 Asians. Patients' age at the time of presentation ranged from 20 to 69 years. Most patients experienced the disease over 2 years (range, 3 months-20 years); follow-up data were available for 11 (65%) patients (range, 2-95 months). Nine (53%) patients had comorbidities, but none had a history of other skin disease or a family history of acne keloidalis nuchae...
2017: PloS One
https://www.readbyqxmd.com/read/29220540/reflectance-confocal-microscopy-evaluation-of-trichobacteriosis-axilaris
#2
Andrea Combalia, Beatriz Alejo, Susana Puig
We read with great interest the paper by Navarrete-Dechent et al recently published on the Journal of European Academy of Dermatology1 , in which the authors detail the dermoscopic findings of trichobacteriosis and highlight the importance of dermoscopy in these cases. We present the case of a 44-year-old man, who emanated an unpleasant axilary odor during a routine check-up. Close examination of the axillary hair shafts showed soft, brown to yellow irregular masses adherent to the central segment of the hairs, suggesting the diagnosis of trichobacteriosis axilaris (TA)...
December 8, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29217084/oral-phenytoin-protects-against-experimental-cyclophosphamide-chemotherapy-induced-hair-loss
#3
A Y Onaolapo, A A Adebayo, O J Onaolapo
In the current study, effects of oral phenytoin on hair growth in cyclophosphamide-treated rats were assessed with the goal of evaluating the ability of phenytoin to suppress chemotherapy-induced hair loss. Thirty-six rats were randomly assigned to six groups (1k6) of six each (n=6). In all groups, anagen was induced in flank skin of rats by depilation. On day 9 (anagen VI), rats were injected once with either distilled water (groups 1-3) or cyclophoshamide (groups 4-6). From day 10, rats in group 1 and 4 received oral vehicle (distilled water), groups 2 and 5 received oral phenytoin (50mg/kg), while groups 3 and 6 also received oral phenytoin (100mg/kg)...
December 4, 2017: Pathophysiology: the Official Journal of the International Society for Pathophysiology
https://www.readbyqxmd.com/read/29200764/various-wavelengths-of-light-emitting-diode-light-regulate-the-proliferation-of-human-dermal-papilla-cells-and-hair-follicles-via-wnt-%C3%AE-catenin-and-the-extracellular-signal-regulated-kinase-pathways
#4
Hong Jin Joo, Kwan Ho Jeong, Jung Eun Kim, Hoon Kang
Background: The human dermal papilla cells (hDPCs) play an important role in regulation of hair cycling and growth. Objective: The aim of this study was to investigate the effect of different wavelengths of light-emitting diode (LED) irradiation on the proliferation of cultured hDPCs and on the growth of human hair follicles (HFs) in vitro. Methods: We examined the effect of LED irradiation on Wnt/β-catenin signaling and mitogen-activated protein kinase (MAPK) pathways in hDPCs...
December 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/29186263/white-piedra-black-piedra-tinea-versicolor-and-tinea-nigra-contribution-to-the-diagnosis-of-superficial-mycosis
#5
John Verrinder Veasey, Ricardo Bertozzi de Avila, Barbara Arruda Fraletti Miguel, Laura Hitomi Muramatu
Superficial mycoses are fungal infections restricted to the stratum corneum and to the hair shafts, with no penetration in the epidermis; they are: white piedra, black piedra, tinea versicolor, and tinea nigra. This study presents images of mycological tests performed in the laboratory, as well as exams performed at the authors office, in order to improve the dermatologist's knowledge about the diagnosis of these dermatoses, which are common in many countries.
May 2017: Anais Brasileiros de Dermatologia
https://www.readbyqxmd.com/read/29181849/the-walking-dead-sequential-nuclear-and-organelle-destruction-during-hair-development
#6
L A Jones, D P Harland, B B Jarrold, J E Connolly, M G Davis
BACKGROUND: Transition of hair shaft keratinocytes from actively respiring, nucleated cells to structural cells devoid of nucleus and cytoplasm, is key to hair production. This form of cell "death", or cornification, requires cellular organelle removal to allow the cytoplasm to become packed with keratin filament bundles that further require cross-linking to create a strong hair fibre. Although these processes are well described in epidermal keratinocytes, there is a lack of understanding of such mechanisms specifically in the hair follicle...
November 27, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29177147/exogen-hairs-in-women-with-and-without-hair-loss
#7
Marcella Guarrera, Alfredo Rebora
Contrary to the classical view of the hair cycle, in which telogen is the resting phase that precedes the release of the hair shaft, another phase has been introduced, exogen. Exogen is the phase wherein the processes for the release of the hair shaft are initiated and successfully executed. Exogen ends when the shaft is liberated. Accordingly, human hairs would be preferably released not with telogen but with exogen roots. To better understand this somehow revolutionary point and what occurs in telogen effluvium (TE) and in androgenetic alopecia (AGA), we undertook a morphological study...
October 2017: Skin Appendage Disorders
https://www.readbyqxmd.com/read/29171081/in-vitro-determination-of-mexican-mestizo-hair-shaft-diameter-using-optical-coherence-tomography
#8
Maria Abril Martinez-Velasco, Marina Perper, Austin J Maddy, Jessica Cervantes, Ariel E Eber, Sebastian H Verne, Norma Elizabeth Vazquez-Herrera, Keyvan Nouri, Antonella Tosti
BACKGROUND: Mexican mestizo population has a pluriethnic mixture of Amerindian, European and African ancestry, predominant in most Latin American countries. Until now, there are no reports about hair characteristics in this population, necessary to define normal values, for hair diseases evaluation and comparison among other ethnic groups. METHODS: The VivoSight® swept-source multibeam optical coherence tomography system was used to evaluate hair diameter and shape in 30 females...
November 23, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/29156398/spontaneous-hair-follicle-germ-hfg-formation-in%C3%A2-vitro-enabling-the-large-scale-production-of-hfgs-for-regenerative-medicine
#9
Tatsuto Kageyama, Chisa Yoshimura, Dina Myasnikova, Ken Kataoka, Tadashi Nittami, Shoji Maruo, Junji Fukuda
Hair follicle morphogenesis is triggered by reciprocal interactions between hair follicle germ (HFG) epithelial and mesenchymal layers. Here, we developed a method for large-scale preparation of HFGs in vitro via self-organization of cells. We mixed mouse epidermal and mouse/human mesenchymal cells in suspension and seeded them in microwells of a custom-designed array plate. Over a 3-day culture period, cells initially formed a randomly distributed single cell aggregate and then spatially separated from each other, exhibiting typical HFG morphological features...
November 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/29149771/hoxc13-and-hsp27-expression-in-skin-and-the-periodic-growth-of-secondary-fiber-follicles-from-longdong-cashmere-goats-raised-in-different-production-systems
#10
Jiqing Wang, Ping Yu, Haifang Wang, Yanyu He
This experiment was conducted to identify periodic changes in secondary follicles (SFs) over one year of extensive (grazed) and intensive (housed and fed supplement) farming of Longdong cashmere goats. One-year old goats (n = 24, 12 extensively fed and 12 intensively fed) were studied. The diameter, depth, density, activity, and ultra-structural features of SFs were assessed using light microscopy and transmission electron microscopy (TEM). HOXC13 and HSP27 expression were studied using immunohistochemistry and immunofluorescence method...
November 17, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29143381/comparing-dermoscopy-and-histological-examination-of-normal-equine-skin
#11
Lara M Tomich, Jason B Pieper, Adam W Stern
BACKGROUND: Dermoscopy is a noninvasive diagnostic technique that allows visualization of structures of the superficial dermis not visible with the naked eye. HYPOTHESIS/OBJECTIVES: To assess the usefulness and applicability of dermoscopy for evaluation of healthy equine skin. ANIMALS: Twelve healthy horses from a research herd. METHODS: Five regions (cheek, lateral neck, dorsum, flank and abdomen) were examined with contact dermoscopy using both nonpolarized and polarized light at both 17-fold and 24-fold magnification...
November 15, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/29118524/collision-tumor-between-trichofolliculoma-and-melanocytic-nevus
#12
Christel Bolte, Roberto Cullen, Ivo Sazunic
Trichofolliculoma (TF) is a hamartomatous hair follicle-related tumor, clinically described as a dome-shaped papule with a central pore crossed by one or more silky white hairs. Histologically, it described as a cystic cavity containing keratinous debris, hair shaft fragments, and numerous hair follicles arising from its linings. Collision or compound tumors are a coexistence of two or more identifiable tumors in the same lesion. We present a case of a 47-year-old man with a lesion on his left cheek clinically characterized as a TF...
October 2017: International Journal of Trichology
https://www.readbyqxmd.com/read/29114149/cat-fur-mite-lynxacarus-radovskyi-in-india
#13
C Jayanthy, B Nagarajan, Bhaskaran Ravi Latha
A Persian cat with the complaint of lustreless dry coat, salt and pepper appearance was brought to the dermatology unit of Madras Veterinary College, Chennai. Microscopical examination of the tape impression and hair coat brushings revealed Lynxacarus radovskyi mites with eggs adhering to the hair shaft. The cat was treated with Ivermectin @ 300 µg/kg body weight subcutaneously once a week for 5 weeks after getting owner's consent. The cat was free from the parasites 5 weeks post treatment. Fomite and close contact might aid the spread of infestation...
December 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/29094427/dermoscopic-analysis-of-the-skin-of-healthy-warmblood-horses-a-descriptive-study-of-34-cases-in-italy
#14
Sara Legnani, Eric Zini, Paola Roccabianca, Beatrice Funiciello, Giordana Zanna
BACKGROUND: Dermoscopy is a diagnostic tool that has been introduced into small animal dermatology for the evaluation of hair and the skin surface. To the best of the authors' knowledge, the use of this technique on horses and the dermoscopic appearance of equine hair and skin have yet to be reported. HYPOTHESIS/OBJECTIVES: To assess the feasibility of dermoscopy, and to describe hair and skin surface features of healthy warmblood horses. ANIMALS: Thirty four client-owned, healthy adult horses...
November 1, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/29081354/the-eversible-tentacle-organs-of-polyommatus-caterpillars-lepidoptera-lycaenidae-morphology-fine-structure-sensory-supply-and-functional-aspects
#15
W Gnatzy, M Jatho, T Kleinteich, S N Gorb, R Hustert
In their late (3(th) and 4th) larval stages, caterpillars of the myrmecophilous lycaenid (Lepidoptera) species Polyommatus coridon and P.icarus respectively, possess on their 8th abdominal segment two eversible so called tentacle organs (TOs). Previous histological and behavioural results have proposed that the TOs may release a volatile substance that elicits "excited runs" in attendant ants. In our study we investigated for the first time the temporal in- and eversion pattern of TOs. Using nerve tracing, Micro-CT, light- and electron microscopy techniques we studied (i) the histology of the 8th abdominal segment, (ii) the fine structure of the cuticular and cellular apparatus of the TOs, (iii) the attachment sites of the retractor muscle of each TO and (iv) the fine structure of the long slender tentacle hairs which are exposed to the outside, when the TOs are everted and fold back into the TO-sac during inversion...
October 25, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/29069081/spatiotemporal-changes-in-the-distribution-of-lhfpl5-in-mice-cochlear-hair-bundles-during-development-and-in-the-absence-of-pcdh15
#16
Shanthini Mahendrasingam, Robert Fettiplace, Kumar N Alagramam, Ellen Cross, David N Furness
Mechanosensory transduction by vertebrate hair cells depends on a protein complex at the tips of shorter stereocilia associated with mechanoelectrical transduction channels activated by tip links in the hair bundle. In mammalian hair cells, this complex includes transmembrane channel-like protein subunit 1 (TMC1), lipoma HMGIC fusion partner-like 5 protein (LHFPL5) and protocadherin 15 (PCDH15), a lower-end component of the tip link. TMC1 interacts with LHFPL5 and PCDH15 but how the complex develops to maturity, and the relationships between these proteins, remains uncertain...
2017: PloS One
https://www.readbyqxmd.com/read/29043488/hair-analysis-does-not-allow-to-discriminate-between-acute-and-chronic-administrations-of-a-drug-in-young-children
#17
Jean Claude Alvarez, Laetitia Lasne, Isabelle Etting, Gérard Chéron, Véronique Abadie, Nicolas Fabresse, Islam Amine Larabi
There are many differences between the hair from children and that of adult subjects, the hair being thinner, more porous with a different growth rate from the usual 1 cm/month observed in adults. In order to determine whether hair analysis could discriminate between chronic use and acute administration of a drug in children like in adults, we analyzed hair from 18 children aged between 1 day and 15 years in whom the administration of different drugs was known (single therapeutic administration or acute intoxication)...
October 18, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29024924/assessing-heteroplasmic-variant-drift-in-the-mtdna-control-region-of-human-hairs-using-an-mps-approach
#18
Jamie M Gallimore, Jennifer A McElhoe, Mitchell M Holland
Resolution of mitochondrial (mt) DNA heteroplasmy is possible when applying a massively parallel sequencing (MPS) approach. However, interpretation criteria for matching heteroplasmic sequences will need to be established that address a number of important topics, including the drift of variants in sample types such as human hair shafts. Prior to MPS analysis, we compared three different DNA extraction methods for hair using a custom mtDNA quantitative PCR (mtqPCR) assay, and found that a method involving bead capture significantly outperformed methods currently in place in forensic laboratories...
October 2, 2017: Forensic Science International. Genetics
https://www.readbyqxmd.com/read/29019741/activation-of-mtorc1-signaling-is-required-for-timely-hair-follicle-regeneration-from-radiation-injury
#19
Wei-Hung Wang, Ting-Han Chien, Sabrina Mai-Yi Fan, Wen-Yen Huang, Shih-Fan Lai, June-Tai Wu, Sung-Jan Lin
Transit amplifying cells (TACs) are highly proliferative in nature and tend to be sensitive to ionizing radiation. Due to the abundance of TACs that support the elongation of hair shafts, growing hair follicles are highly sensitive to radiation injury. How hair follicles repair themselves after radiation injury is unclear. In this study, we observed that in 4 Gy irradiated mice, hair follicle dystrophy was induced with apoptosis-driven loss of hair matrix cells, which are the TACs that fuel hair growth. The dystrophy was repaired within 96 h without significant hair loss, indicating that a regenerative attempt successfully restored the TAC population to resume anagen growth...
October 11, 2017: Radiation Research
https://www.readbyqxmd.com/read/28993934/successful-nuclear-dna-profiling-of-rootless-hair-shafts-a-novel-approach
#20
Kelly S Grisedale, Gina M Murphy, Hiromi Brown, Mark R Wilson, Sudhir K Sinha
Historically, rootless hair shaft samples submitted to a forensic laboratory for DNA analysis are reserved for mitochondrial DNA (mtDNA) analysis due to the presence of highly degraded as well as insufficient amounts of nuclear DNA. Although mtDNA has been very successful in obtaining results from rootless hair, this system has its limitations, namely, it is a lineage marker that cannot differentiate between maternally related genotypes. Given the high incidence of hairs as forensic evidence, there is a need for the use of a nuclear DNA test system capable of producing reliable results for hair shaft forensic evidence...
October 9, 2017: International Journal of Legal Medicine
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