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Langerhans dendritic cells

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https://www.readbyqxmd.com/read/28638562/a-rare-case-of-oral-multisystem-langerhans-cell-histiocytosis
#1
Maria-Teresa Facciolo, Francesco Riva, Patrizia Gallenzi, Romeo Patini, Domenico Gaglioti
Langerhans cell histiocytosis (LCH) is a rare disorder characterized by high proliferation of Langerhans dendritic cells. LCH is a solitary or multifocal disease that primarily involves bone tissue and often affects children and young men. A 29 years-old Caucasian man was referred to the Oral Surgery Unit of George Eastman Hospital - Umberto I teaching hospital, with third degree mobility of teeth belonging to second, third and fourth quadrant. Panoramic radiograph showed multiple radiolucent areas with well demarcated borders on the right and left site of the mandible and on the left site of the maxilla...
June 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28626593/langerhans-cell-sarcoma-a-case-report-demonstrating-morphological-and-immunophenotypical-variability-within-a-single-lesion
#2
Rasika Singh, Charles Edward Keen, Christopher Stone, Patrick Sarsfield
Langerhans cells are antigen presenting dendritic cells and tumours arising from these are rare. The tumours arising from these dendritic cells are divided into two categories according to a WHO classification: Langerhans cell histiocytosis and Langerhans cell sarcoma. It is the degree of atypia and clinical aggressiveness that distinguishes the two subtypes. Langerhans cell sarcoma (LCS) is a neoplastic proliferation of Langerhans cells which can occur in skin, bone marrow, lymph nodes, spleen, liver, and lung...
2017: Case Reports in Pathology
https://www.readbyqxmd.com/read/28617889/erdheim-chester-disease-presenting-with-histiocytic-colitis-and-cytokine-storm
#3
George P Christophi, Yeshika Sharma, Quader Farhan, Umang Jain, Ted Walker, Gregory S Sayuc, Deborah C Rubin
BACKGROUND: Non-Langerhans histiocytosis is a group of inflammatory lymphoproliferative disorders originating from non-clonal expansion of hematopoietic stem cells into cytokine-secreting dendritic cells or macrophages. Erdheim-Chester Disease (ECD) is a rare type of non-Langerhans cell histiocytosis characterized by tissue inflammation and injury caused by macrophage infiltration and histologic findings of foamy histiocytes. Often ECD involves the skeleton, retroperitoneum and the orbits...
June 2017: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/28586276/dendritic-cell-trafficking-and-function-in-rare-lung-diseases
#4
Huan Liu, Claudia Jakubzick, Andrew R Osterburg, Rebecca L Nelson, Nishant Gupta, Francis X McCormack, Michael T Borchers
Dendritic cells (DCs) are highly specialized immune cells that capture antigens and then migrate to lymphoid tissue and present antigen to T cells. This critical function of DCs is well defined and recent studies further demonstrate that DCs are also key regulators of several innate immune responses. Studies focused on the roles of DCs in the pathogenesis of common lung diseases such as asthma, infection and cancer have traditionally driven our mechanistic understanding of pulmonary DC biology. The emerging development of novel DC reagents, techniques and genetically modified animal models has provided abundant data revealing distinct populations of DCs in the lung and allow us to examine mechanisms of DC development, migration and function in pulmonary disease with unprecedented detail...
June 6, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28585308/immunosurveillance-profile-of-oral-squamous-cell-carcinoma-and-oral-epithelial-dysplasia-through-dendritic-and-t-cells-analysis
#5
Ana Carolina Amorim Pellicioli, Lynne Bingle, Paula Farthing, Márcio Ajudarte Lopes, Manoela Domingues Martins, Pablo Agustin Vargas
Oral squamous cell carcinomas (OSCC) can arise from potentially malignant disorders, such as leukoplakia. The immune system plays an important role recognizing tumour precursor cells. However, due to immunoediting mechanisms cancer cells are able to escape immune system surveillance. OBJECTIVE: Evaluate the profile of dendritic (Langerhans and plasmacytoid) and T cells in OSCC and oral epithelial dysplasia (OED) and correlate these findings with clinical data. MATERIALS AND METHODS: Fifty cases of OSCC and 48 of OED were immunostained for CD1a and CD83 dendritic Langerhans cells (DLC), plasmacytoid dendritic cells (pDC) CD303 and CD8 followed by quantitative analysis...
June 5, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/28582647/inflammatory-serum-cytokines-and-chemokines-increase-associated-with-the-disease-extent-in-pediatric-langerhans-cell-histiocytosis
#6
Akira Morimoto, Yukiko Oh, Sachie Nakamura, Yoko Shioda, Tomomi Hayase, Toshihiko Imamura, Kazuko Kudo, Shinsaku Imashuku
OBJECTIVE: Langerhans cell histiocytosis (LCH) is characterized by immature dendritic cell proliferation, infiltration of LCH lesions by various inflammatory cells, and a lesional cytokine storm. It is classified into three groups on the basis of disease extent, namely, multisystem with risk-organ involvement (MS+), multisystem without risk-organ involvement (MS-), and single-system (SS) disease. We comprehensively analyzed whether serum levels of cytokines/chemokines reflect the disease extent...
June 2, 2017: Cytokine
https://www.readbyqxmd.com/read/28566492/functional-evidence-for-derivation-of-systemic-histiocytic-neoplasms-from-hematopoietic-stem-progenitor-cells
#7
Benjamin H Durham, Damien Roos-Weil, Claude Baillou, Fleur Cohen-Aubart, Akihide Yoshimi, Makoto Miyara, Matthias Papo, Zofia Hélias-Rodzewicz, Nathalie Terrones, Neval Ozkaya, Ahmet Dogan, Raajit Rampal, Fanny Urbain, Lucie Le Fèvre, Eli L Diamond, Christopher Y Park, Thomas Papo, Frédéric Charlotte, Guy Gorochov, Valérie Taly, Olivier A Bernard, Zahir Amoura, Omar Abdel-Wahab, François M Lemoine, Julien Haroche, Jean-Francois Emile
Langerhans Cell Histiocytosis (LCH) and the non-LCH neoplasm Erdheim-Chester Disease (ECD) are heterogeneous neoplastic disorders marked by infiltration of pathologic macrophage-, dendritic cell-, or monocyte-derived cells in tissues driven by recurrent mutations activating MAP kinase signaling. Although recent data indicate that at least a proportion of LCH and ECD patients have detectable activating kinase mutations in circulating hematopoietic cells and bone marrow-based hematopoietic progenitors, functional evidence of the cell-of-origin of histiocytosis from actual patient materials has long been elusive...
May 31, 2017: Blood
https://www.readbyqxmd.com/read/28551613/erdheim-chester-disease-comprehensive-review-of-molecular-profiling-and-therapeutic-advances
#8
REVIEW
Faysal Haroun, Kristen Millado, Imad Tabbara
The revised 2016 World Health Organization classification introduced Erdheim-Chester disease (ECD) as a provisional entity within the histiocytic and dendritic cell neoplasms separate from the juvenile xanthogranuloma family based on distinct molecular features. However, evolving knowledge regarding the molecular and genetic aberrations in addition to common clinical features of ECD support the classification of ECD together with Langerhans cell histiocytosis (LCH). Accordingly, ECD can be thought of as an inflammatory myeloid clonal disorder based on the detection of various activating mutations along the mitogen activated protein kinase-extracellular signal regulated kinase (MAPK-ERK) pathway with most notable variant being a valine to a glutamic acid substitution at amino acid 600 in the B-rapidly accelerated fibrosarcoma protein (BRAFV600E)...
June 2017: Anticancer Research
https://www.readbyqxmd.com/read/28547979/association-of-infiltrating-cells-with-microvessel-density-in-oral-squamous-cell-carcinoma
#9
Olga Stasikowska-Kanicka, Małgorzata Wągrowska-Danilewicz, Marian Danilewicz
Several lines of evidence indicate that immune cells in the tumor microenvironment play an important role in regulating tumor progression. An immunohistochemical method was used to examine the abundance of natural killer (NK) cells, mucosal dendritic cells (DCs), macrophages, mast cells, and microvessel density in 78 cases of oral squamous cell carcinoma (OSCC): with better prognosis - OSCCBP (n = 37), and with poorer prognosis - OSCCPP (n = 41), and 18 controls. The mean numbers of macrophages and microvessels were significantly higher in the OSCCPP group in comparison to both OSCCBP and control groups...
2017: Polish Journal of Pathology: Official Journal of the Polish Society of Pathologists
https://www.readbyqxmd.com/read/28533400/the-pentameric-complex-drives-immunologically-covert-cell-cell-transmission-of-wild-type-human-cytomegalovirus
#10
Isa Murrell, Carmen Bedford, Kristin Ladell, Kelly L Miners, David A Price, Peter Tomasec, Gavin W G Wilkinson, Richard J Stanton
Human cytomegalovirus (HCMV) strains that have been passaged in vitro rapidly acquire mutations that impact viral growth. These laboratory-adapted strains of HCMV generally exhibit restricted tropism, produce high levels of cell-free virus, and develop susceptibility to natural killer cells. To permit experimentation with a virus that retained a clinically relevant phenotype, we reconstructed a wild-type (WT) HCMV genome using bacterial artificial chromosome technology. Like clinical virus, this genome proved to be unstable in cell culture; however, propagation of intact virus was achieved by placing the RL13 and UL128 genes under conditional expression...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28521873/low-periostin-levels-in-adult-patients-with-langerhans-cell-histiocytosis-are-independently-associated-with-the-disease-activity
#11
Athanasios D Anastasilakis, Stergios A Polyzos, Marina Tsoli, Athanasios Papatheodorou, Panagiotis Kokkoris, Gregory Kaltsas, Evangelos Terpos, Polyzois Makras
PURPOSE: Langerhans cell histiocytosis (LCH) is a rare proliferative disease of cells of the CD1a+/CD207+ myeloid dendritic cell lineage that may infiltrate one or more organs or systems at all ages. We aimed to evaluate periostin and sclerostin serum levels in adult patients with LCH. PROCEDURES: This was a cross-sectional study comparing 38 adult patients with LCH with 38 age- and sex-matched healthy controls. Serum periostin and sclerostin levels were measured to compare between LCH patients and controls as well as between patients with active and non-active disease...
June 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28504206/braf-v600e-mutation-in-pediatric-intracranial-and-cranial-juvenile-xanthogranuloma
#12
Piti Techavichit, Darintr Sosothikul, Thiamjit Chaichana, Chinachote Teerapakpinyo, Paul Scott Thorner, Shanop Shuangshoti
Juvenile xanthogranuloma (JXG) is a cutaneous form of non-Langerhans cell histiocytosis (LCH), primarily affecting children. The lesion is presumed to originate from either macrophages or dermal dendritic cells. JXG can rarely present as an isolated intracranial lesion and, in contrast to the dismal outcome of patients with systemic disease, cranial JXG has been shown to carry a more favorable prognosis. Here, we report for the first time 3 pediatric cases of JXG with a BRAF V600E mutation, 2 with intracranial lesions and one with cranial lesions...
May 10, 2017: Human Pathology
https://www.readbyqxmd.com/read/28501765/enhanced-sublingual-immunotherapy-by-tat-fused-recombinant-allergen-in-a-murine-rhinitis-model
#13
Farhad Salari, Fatemeh Vahedi, Abdol-Reza Varasteh, Hanieh Ketabdar, Jamshidkhan Chamani, Mojtaba Sankian
Allergen-specific sublingual immunotherapy (SLIT) is well known as an effective and non-invasive route to induce allergy desensitization. The goal of this study was to investigate whether a TAT-fused recombinant allergen could enhance SLIT efficacy. BALB/c mice sensitized to the main allergen (Che a 3) of Chenopodium album pollen were treated sublingually either with rChe a 3 (100μg/dose) or rTAT-Che a 3 (100μg/dose), two times per week for eight weeks. SLIT with rTAT-Che a 3 led to significantly greater allergen-specific IgG2a than rChe a 3; however, neither rTAT-Che a 3 nor rChe a 3 affected allergen-specific IgE or IgG1 antibody levels...
May 11, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28497462/skin-hyperpigmentation-following-intravenous-polymyxin-b-treatment-associated-with-melanocyte-activation-and-inflammatory-process
#14
K P H Mattos, M L Cintra, I R Gouvêa, L Á Ferreira, P E N F Velho, P Moriel
What is known and objective Polymyxins were widely used until the 1960s; however, they fell into disfavour owing to their toxicity. The subsequent growth of infections caused by multidrug-resistant Gram-negative bacteria has led to renewed use of this class of antimicrobials in clinical practice. Acquired skin hyperpigmentation (SH) following intravenous polymyxin B treatment has been previously reported, but little is known about its pathogenesis, clinical course and treatment. To improve understanding of these issues, we conducted a prospective study of adult patients receiving intravenous polymyxin B treatment...
May 11, 2017: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/28482919/langerhans-cell-histiocytosis-of-the-maxillae-in-a-child-treated-only-with-chemotherapy-a-case-report
#15
Angela Pia Cazzolla, Giuseppe Troiano, Khrystyna Zhurakivska, Eugenio Maiorano, Gianfranco Favia, Maria Grazia Lacaita, Giuseppe Marzo, Franca Dicuonzo, Stefano Andresciani, Lorenzo Lo Muzio
BACKGROUND: Langerhans cell histiocytosis is a sporadic disease caused by an uncontrolled pathogenic clonal proliferation of dendritic cells that have Langerhans cell characteristics. New treatment protocols provided by the HISTSOC-LCH-III (NCT00276757) trial show an improvement in the survival of children with langerhans cell histiocytosis. CASE PRESENTATION: We report a case of Langerhans cell histiocytosis, which presented as an osteolytic lesion of the left pre-maxillae enclosing the deciduous incisor and canine in a 7-month-old white Italian boy...
May 9, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28457909/critical-role-for-skin-derived-migratory-dcs-and-langerhans-cells-in-tfh-and-gc-responses-after-intradermal-immunization
#16
Clément Levin, Olivia Bonduelle, Charles Nuttens, Charlotte Primard, Bernard Verrier, Alexandre Boissonnas, Béhazine Combadière
Intradermal (ID) delivery of antigen represents a potent route of immunization that involves multiple blood- and skin-derived dendritic cell (DC) sub-populations endowed with specialized functions and dynamics in their ability to prime naïve CD4+ T cells in the draining lymph node (DLN). Yet, their individual contributions to the generation of CD4+ T follicular helper (TFH) cells and germinal centers (GCs) remain to be understood. We found that ID immunization of mice with a particle-based vaccine induced robust TFH and GC B cell responses in skin DLNs, which were completely abrogated when skin cell emigration was prevented...
April 27, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28433429/immunological-function-of-langerhans-cells-in-hiv-infection
#17
Takamitsu Matsuzawa, Youichi Ogawa, Kohji Moriishi, Shinji Shimada, Tatsuyoshi Kawamura
BACKGROUND: Langerhans cells (LCs) are one of the initial target cells for HIV following sexual exposure and they are productively infected by HIV. HIV-infected LCs migrate to the draining lymph nodes (dLNs) and transmit the virus to CD4(+) T cells, leading to the dissemination of HIV. In contrast with the role of LCs in initial HIV acquisition, little is known about the modulation of immune responses by HIV-infected LCs. OBJECTIVE: We aimed to elucidate the induction of HIV-specific CD8(+) T cells and regulatory T cells (Tregs), both of which play important roles in regulating the progression of HIV infection...
April 9, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28410606/in-vivo-quantification-of-quantum-dot-systemic-transport-in-c57bl-6-hairless-mice-following-skin-application-post-ultraviolet-radiation
#18
Samreen Jatana, Brian C Palmer, Sarah J Phelan, Robert Gelein, Lisa A DeLouise
BACKGROUND: Previous work has demonstrated size, surface charge and skin barrier dependent penetration of nanoparticles into the viable layers of mouse skin. The goal of this work was to characterize the tissue distribution and mechanism of transport of nanoparticles beyond skin, with and without Ultraviolet Radiation (UVR) induced skin barrier disruption. Atomic absorption spectroscopy (AAS), flow cytometry and confocal microscopy were used to examine the effect of UVR dose (180 and 360 mJ/cm(2) UVB) on the skin penetration and systemic distribution of quantum dot (QD) nanoparticles topically applied at different time-points post UVR using a hairless C57BL/6 mouse model...
April 14, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28407623/fine-needle-aspiration-of-langerhans-cell-histiocytosis-a-cytopathologic-study-of-37-cases
#19
MULTICENTER STUDY
Jen-Fan Hang, Momin T Siddiqui, Syed Z Ali
OBJECTIVE: Langerhans cell histiocytosis (LCH) is an uncommon neoplasm of dendritic cells and predominantly occurs in children and young adults. The study aims to evaluate cytopathologic features and current diagnostic concepts in a large series of LCH on fine needle aspiration (FNA). STUDY DESIGN: We retrospectively searched the pathology archives of The Johns Hopkins Hospital (JHH) and Emory University Hospital (EUH) to identify all FNA cases diagnosed as LCH in a period of 21 years...
2017: Acta Cytologica
https://www.readbyqxmd.com/read/28338177/5-aminolevulinic-acid-photodynamic-therapy-stimulates-local-immunity-in-patients-with-condylomata-acuminata-via-activation-of-t-lymphocytes
#20
J Du, Q Cheng, Z Zhang, J-F Wu, F Li, S-Y Chen, Y-L Wang, X-N Lu, J-H Xu
OBJECTIVE: 5-Aminolevulinic acid photodynamic therapy (5-ALA-PDT) for condylomata acuminate (CA) is effective and safe, but how this treatment affects immune reaction is poorly understood. We aimed to explore the effects of PDT on local immunity in CA. PATIENTS AND METHODS: Immunohistochemical analysis before and after PDT was performed to analyze local changes in the distribution of T lymphocytes, CD123+ plasmacytoid dendritic cells (pDCs) and CD1a+ myeloid DCs...
March 2017: European Review for Medical and Pharmacological Sciences
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