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https://www.readbyqxmd.com/read/28515896/a-worldwide-phylogeography-of-the-whiteworm-lichens-thamnolia-reveals-three-lineages-with-distinct-habitats-and-evolutionary-histories
#1
Ioana Onuţ-Brännström, Leif Tibell, Hanna Johannesson
Thamnolia is a lichenized fungus with an extremely wide distribution, being encountered in arctic and alpine environments in most continents. In this study, we used molecular markers to investigate the population structure of the fungal symbiont and the associated photosynthetic partner of Thamnolia. By analyzing molecular, morphological, and chemical variation among 253 specimens covering the species distribution range, we revealed the existence of three mycobiont lineages. One lineage (Lineage A) is confined to the tundra region of Siberia and the Aleutian Islands, a second (Lineage B) is found in the high alpine region of the Alps and the Carpathians Mountains, and a third (Lineage C) has a worldwide distribution and covers both the aforementioned ecosystems...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28511823/dissociation-and-conversion-symptoms-in-dermatology
#2
Madhulika A Gupta, Branka Vujcic, Aditya K Gupta
Dissociation and conversion (defined as the somatic component of dissociation) can play an important mediating role in the exacerbation of the stress-reactive dermatoses (eg, psoriasis, idiopathic urticaria, atopic dermatitis), dermatoses that are exacerbated by excessive scratching (eg, lichen simplex chronicus, prurigo nodularis) and koebnerization, and the self-induced dermatoses (dermatitis artefacta, acne excoriée, skin picking disorder, trichotillomania, onychotillomania/onychophagia). Dissociative symptoms often coexist with obsessive-compulsive symptoms in the more severe cases of the self-induced dermatoses...
May 2017: Clinics in Dermatology
https://www.readbyqxmd.com/read/28492056/lichenoid-vulvar-disease-a-review
#3
REVIEW
R Fruchter, L Melnick, M K Pomeranz
Vulvar dermatoses are common, potentially debilitating conditions that can be seen by a variety of medical specialists. Lichenoid vulvar diseases, namely lichen sclerosus (LS), lichen planus (LP), and lichen simplex chronicus (LSC), can all negatively impact patients' quality of life and LS and LP also have an association with squamous cell carcinoma. It is essential that dermatologists are familiar with the unique features of each of these conditions to ensure the appropriate management and follow up. Herein, we provide an update on the epidemiology, clinical presentation, histopathology, and treatment of patients with vulvar LS, LP, and LSC...
March 2017: International Journal of Women's Dermatology
https://www.readbyqxmd.com/read/28471862/t-cell-responses-to-hsv-1-in-persons-who-have-survived-childhood-herpes-simplex-encephalitis
#4
Mariliis Ott, Lichen Jing, Lazaro Lorenzo, Jean-Laurent Casanova, Shen-Ying Zhang, David M Koelle
BACKGROUND: Herpes simplex encephalitis (HSE) after primary HSV-1 infection can occur in children due to inborn errors of cell-intrinsic immunity in the central nervous system (CNS). Paradoxically, symptomatic mucocutaneous HSV-1 recurrences are rare survivors of childhood HSE. T-cell acquired immunity is thought to be involved in control of recurrent mucocutaneous HSV infection. We thus tested HSV-1-specific immunity in HSE survivors. METHODS: We obtained serum and peripheral blood mononuclear cells (PBMC) a median of 13...
May 3, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28445195/protective-effect-of-botulinum-toxin-type-a-against-atopic-dermatitis-like-skin-lesions-in-nc-nga-mice
#5
Sang Bum Han, Hyeree Kim, Sang Hyun Cho, Jin Ho Chung, Hei Sung Kim
BACKGROUND: Botulinum neurotoxin (BTX) A possesses various biological activities, including anti-inflammatory and antipruritic actions. Human and animal studies have shown that BTX is effective in treating histamine-induced itch, lichen simplex chronicus, psoriasis, rosacea, allergic rhinitis, and scar prevention. However, its effect on atopic dermatitis (AD) has not been studied yet. OBJECTIVE: To examine the effect of BTX on AD using a mouse model. The primary outcome was skin thickness and transepidermal water loss (TEWL), and the secondary outcome was the alteration in skin severity scores, histological, and laboratory test results...
April 24, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28442799/study-of-pruritus-vulvae-in-geriatric-age-group-in-tertiary-hospital
#6
Jasleen Kaur, Jyotika Kalsy
BACKGROUND: According to the World Health Organization criteria, geriatric population is people above 60 years of age. In this phase of life, a woman has already gone through menopause and its associated emotional, physical, and hormonal changes. These changes are due to gradual loss of estrogen that comes with menopause which results in dramatic changes in the appearance of vulva and vagina. With age, skin of vulva becomes thin, loses elasticity, and moisture so that the patient starts feeling burning and itchy sensation...
January 2017: Indian Journal of Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/28374436/acquired-elastotic-hemangioma-like-changes-and-eccrine-sweat-duct-squamous-metaplasia-in-lichen-simplex-chronicus-prurigo-nodularis-like-lesions-of-the-knee-and-elbow
#7
Denisa Kacerovska, Francesca Portelli, Michal Michal, Dmitry V Kazakov
BACKGROUND: So called "acquired elastotic hemangioma" (AEH) represents a peculiar vascular lesion affecting the sun-damaged skin of the extensor surface of the forearms or the lateral aspect of the neck of middle-aged or elderly women. METHODS: This is a clinicopathological and immunohistochemical study of a series of 6 lesions located on the knee or elbow showing epithelial features of lichen simplex chronicus (LSC)/prurigo nodularis (PN) with a marked subepidermal vascular proliferation closely resembling AEH...
April 4, 2017: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28338543/clinical-study-of-124-patients-having-perianal-dermatitis
#8
Alfredo-Daniel Agulló-Pérez, Marcos Hervella-Garcés, Saioa Oscoz-Jaime, Maialen Azcona-Rodríguez, Mónica Larrea-García, Juan-Ignacio Yanguas-Bayona
BACKGROUND: Perianal complaints are often consulted in dermatology clinics, and in many cases, a conclusive diagnosis is not easily made. OBJECTIVE: The aim of this study was to study and identify the epidemiological, clinical, and contact allergy features of patients with perianal dermatitis who attended at a contact dermatitis unit in a tertiary hospital in Spain. METHODS: Adult patients with long-lasting (>4 weeks) perianal dermatitis were recruited during the past 10 years for investigation and follow-up...
March 23, 2017: Dermatitis
https://www.readbyqxmd.com/read/28287142/worldwide-circulation-of-hsv-2%C3%A2-%C3%A3-%C3%A2-hsv-1-recombinant-strains
#9
David M Koelle, Peter Norberg, Matthew P Fitzgibbon, Ronnie M Russell, Alex L Greninger, Meei-Li Huang, Larry Stensland, Lichen Jing, Amalia S Magaret, Kurt Diem, Stacy Selke, Hong Xie, Connie Celum, Jairam R Lingappa, Keith R Jerome, Anna Wald, Christine Johnston
Homo sapiens harbor two distinct, medically significant species of simplexviruses, herpes simplex virus (HSV)-1 and HSV-2, with estimated divergence 6-8 million years ago (MYA). Unexpectedly, we found that circulating HSV-2 strains can contain HSV-1 DNA segments in three distinct genes. Using over 150 genital swabs from North and South America and Africa, we detected recombinants worldwide. Common, widely distributed gene UL39 genotypes are parsimoniously explained by an initial >457 basepair (bp) HSV-1 × HSV-2 crossover followed by back-recombination to HSV-2...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28259230/vulvovaginal-issues-in-mature-women
#10
REVIEW
Mary L Marnach, Rochelle R Torgerson
Mature women often present with symptomatic vulvovaginal atrophy and vulvar dermatoses, causing noncoital pain, dyspareunia, and sexual changes. Diagnosis of these conditions can be challenging, and long-term management is required to decrease morbidity and enhance quality of life. Vaginal estrogen therapies remain safe and effective for treating symptomatic vulvovaginal atrophy. A vulvar biopsy is easy to perform and generally well tolerated when indicated for the diagnosis of lichen simplex chronicus, lichen sclerosus, and lichen planus...
March 2017: Mayo Clinic Proceedings
https://www.readbyqxmd.com/read/28162226/differences-between-men-and-women-in-chronic-scratching-a-psychodermatologic-study-in-lichen-simplex-chronicus
#11
R Martín-Brufau, C Suso-Ribera, C Brufau Redondo, J Corbalán Berná
INTRODUCTION: Chronic scratching is common to many skin disorders. Being a female and presenting a high level of psychopathology are risk factors for chronic scratching. Yet, it is unclear why. Certain personality characteristics that are more prevalent in women are also known to influence emotional states (i.e. emotional tension). OBJECTIVE: The present study aims to explore whether these personality styles might help understand why gender and emotional distress are associated with scratching...
May 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/28109095/-establishment-of-a-sd-rat-model-of-vulvar-lichen-simplex-chronicus-and-detection-of-the-expression-of-protease-activated-receptor-2
#12
Huan Yang, Zhen-Hua Fu, Hua-Jun Tang, Cheng-Zhi Li
OBJECTIVE: To establish a SD rat model of vulvar lichen simplex chronicus (LSC) and investigate the expression of protease activated receptor 2 (PAR2) in the genital skin. METHODS: Seventy female SD rats were randomly divided into group A (blank control group, n=10), group B (with application of acetone solution 3 times per week for 10 weeks, n=10), group C (with chronic mechanical irritation 3 times per week for 10 weeks, n=10), and group D (with topical treatment with 0...
January 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28094165/psoriasiform-dermatitides-a-brief-review
#13
Mark R Wick
Psoriasis vulgaris (PV)-the prototypical "psoriasiform" dermatitis-may assume a spectrum of histologic appearances, depending on whether it has been treated or not. Because of that relative lack of morphological uniformity, other skin disorders that feature epidermal acanthosis, with or without associated inflammation, may be confused diagnostically with PV. This brief review considers the clinicopathologic attributes of PV and its imitators, including chronic spongiotic dermatitides, lichen simplex chronicus, prurigo nodularis, pityriasis rubra pilaris, psoriasiform secondary syphilis, and Reiter syndrome...
December 14, 2016: Seminars in Diagnostic Pathology
https://www.readbyqxmd.com/read/27834349/differentiated-exophytic-vulvar-intraepithelial-lesions-are-genetically-distinct-from-keratinizing-squamous-cell-carcinomas-and-contain-mutations-in-pik3ca
#14
Jaclyn C Watkins, Brooke E Howitt, Neil S Horowitz, Lauren L Ritterhouse, Fei Dong, Laura E MacConaill, Elizabeth Garcia, Neal I Lindeman, Larissa J Lee, Ross S Berkowitz, Marisa R Nucci, Christopher P Crum
Human papillomavirus-negative keratinizing vulvar cancers typically harbor TP53 mutations as do their precursors, differentiated vulvar intraepithelial neoplasia. However, atypical verruciform proliferations are also associated with these malignancies and their pathogenesis is poorly understood. This study compared 11 atypical verruciform lesions, including atypical verruciform hyperplasia, vulvar acanthosis with altered differentiation, and verruciform lichen simplex chronicus, with 14 human papillomavirus-negative keratinizing squamous cell carcinomas...
November 11, 2016: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/27658538/obsessive-compulsive-skin-disorders-a-novel-classification-based-on-degree-of-insight
#15
Tian Hao Zhu, Mio Nakamura, Benjamin Farahnik, Michael Abrouk, Jason Reichenberg, Tina Bhutani, John Koo
Individuals with obsessive-compulsive features frequently visit dermatologists for complaints of the skin, hair, or nails, and often progress towards a chronic relapsing course due to the challenge associated with accurate diagnosis and management of their psychiatric symptoms. The current DSM-5 formally recognizes body dysmorphic disorder, trichotillomania, neurotic excoriation, and body focused repetitive behavior disorder as psychodermatological disorders belonging to the category of Obsessive Compulsive and Related Disorders...
September 23, 2016: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/27513074/assessment-of-ck17-as-a-marker-for-the-diagnosis-of-differentiated-vulvar-intraepithelial-neoplasia
#16
Mirna B Podoll, Naveena Singh, C Blake Gilks, Mana Moghadamfalahi, Mary Ann Sanders
Differentiated vulvar intraepithelial neoplasia (dVIN), precursor of vulvar squamous cell carcinoma, is human papilloma virus independent and often found in a background of lichen sclerosus (LS) and lichen simplex chronicus (LSC). Subtle histologic findings make the diagnosis of dVIN difficult, and, although the use of p53 and Ki-67 has been of some value, there is a need for a better immunohistochemical marker. Cytokeratin 17 (CK17), a cytoskeletal intermediate filament protein, has previously been used in the diagnosis of anogenital lesions...
August 10, 2016: International Journal of Gynecological Pathology
https://www.readbyqxmd.com/read/27473457/onychotillomania-an-underrecognized-disorder
#17
REVIEW
Evan A Rieder, Antonella Tosti
Onychotillomania is an uncommon and likely underreported condition in which patients repetitively manipulate the different constituents of the nail unit. Onychotillomania is characterized by a range of nonspecific findings, including bizarre morphology of the nail plate and damage to the nail bed and periungual skin. Histopathological changes are also nonspecific, but may be viewed as analogous to lichen simplex chronicus and prurigo nodularis of the skin. Clinical history is essential to making this diagnosis, as effective treatment modalities may focus on behavioral therapies and psychiatric medications...
December 2016: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/27172307/comparative-study-of-quality-of-life-and-obsessive-compulsive-tendencies-in-patients-with-chronic-hand-eczema-and-lichen-simplex-chronicus
#18
Anargyros Kouris, Christos Christodoulou, Vasiliki Efstathiou, Eftychia Platsidaki, Revekka Tsatovidou, Evangelia Torlidi-Kordera, Dimitrios Rigopoulos, George Kontochristopoulos
BACKGROUND: Lichen simplex chronicus (LSC) and chronic hand eczema (CHE) are 2 common dermatological disorders that affect physical, social, and psychological aspects of life. The aim of this study was to compare quality of life and obsessive-compulsive tendencies between patients with LSC and patients with CHE. MATERIALS AND METHODS: Sixty patients with LSC, 60 patients with CHE, and 60 healthy controls were included in the study. Quality of life was evaluated according to the Dermatology Life Quality Index (DLQI)...
May 2016: Dermatitis
https://www.readbyqxmd.com/read/27105735/to-control-site-specific-skin-gene-expression-autocrine-mimics-paracrine-canonical-wnt-signaling-and-is-activated-ectopically-in-skin-disease
#19
Dongwon Kim, M Zulfiquer Hossain, Ashley Nieves, Lihong Gu, Tabetha S Ratliff, Seung Mi Oh, Angela Park, Seunghyun Han, Nicole B Yang, Ji Qi, Janis M Taube, Sewon Kang, Luis A Garza
Despite similar components, the heterogeneity of skin characteristics across the human body is enormous. It is classically believed that site-specific fibroblasts in the dermis control postnatal skin identity by modulating the behavior of the surface-overlying keratinocytes in the epidermis. To begin testing this hypothesis, we characterized the gene expression differences between volar (ventral; palmoplantar) and nonvolar (dorsal) human skin. We show that KERATIN 9 (KRT9) is the most uniquely enriched transcript in volar skin, consistent with its etiology in genetic diseases of the palms and soles...
May 2016: American Journal of Pathology
https://www.readbyqxmd.com/read/27097341/tick-bite-alopecia-a-report-and-review
#20
Michael C Lynch, Marissa A Milchak, Herbert Parnes, Michael D Ioffreda
Tick bites can cause a number of local inflammatory reactions, which are often difficult to differentiate from those induced by other arthropod bites or stings. These include erythematous nodular or pustular lesions, erosive plaques, annular lesions of erythema chronicum migrans, and both scarring and nonscarring inflammatory alopecia. We report a case of nonscarring alopecia in a 21-year-old male who reported a recent history of tick bite to the scalp. The biopsy demonstrated a dense pseudolymphomatous inflammatory infiltrate with numerous eosinophils associated with hair follicle miniaturization and an elevated catagen-telogen count...
November 2016: American Journal of Dermatopathology
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