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https://www.readbyqxmd.com/read/28543532/intraepidermal-merkel-cell-carcinoma-a-case-series-of-a-rare-entity-with-clinical-follow-up
#1
George Jour, Phyu P Aung, Eduardo Rozas-Muñoz, Johnathan L Curry, Victor Prieto, Doina Ivan
BACKGROUND: Merkel cell carcinoma (MCC) is a rare but aggressive cutaneous carcinoma. MCC involves typically dermis and although epidermotropism has been reported, MCC strictly intraepidermal or in situ (MCCIS) is exceedingly rare. Most of the cases of MCCIS described so far have associated other lesions, such as squamous or basal cell carcinoma, actinic keratosis, etc. Herein, we describe three patients with MCC strictly in situ, without a dermal component. METHODS: Our patients were elderly, two of the lesions involved the head and neck area and one was on a finger...
May 23, 2017: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28541151/morphological-evaluation-of-merkel-cells-and-small-lamellated-sensory-receptors-in-the-equine-foot
#2
Robert M Bowker, Lisa S Lancaster, Diane A Isbell
OBJECTIVE To examine the equine foot for the presence of sensory receptors including Merkel cells and small lamellated Pacinian-like corpuscles (SLPCs). SAMPLE Forefeet obtained from 7 horses following euthanasia for reasons other than foot disease. PROCEDURES Disarticulated feet were cut into either sagittal sections or cross sections and immersed in neutral-buffered 4% formalin. Following fixation, samples were obtained from the midline of the dorsal aspect of the hoof wall and from the frog (cuneus ungulae) between the apex and central sulcus...
June 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28540062/frequency-and-locations-of-systemic-metastases-in-merkel-cell-carcinoma-by-imaging
#3
Maria Kouzmina, Virve Koljonen, Junnu Leikola, Tom Böhling, Eila Lantto
BACKGROUND: The primary neuroendocrine skin cancer, Merkel cell carcinoma (MCC), has a well-known predilection to metastasize systemically. However, the experience of systemic metastases in MCC is mainly disseminated through case reports due to the rarity of MCC. PURPOSE: To elucidate the frequency and locations of systemic metastasis in MCC by reviewing the imaging of patients with metastatic MCC in a national cohort. MATERIAL AND METHODS: Patients with diagnosed metastatic MCC by imaging studies in Finland during 1999-2012 were included in this study...
March 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28536458/epigenetic-priming-restores-the-hla-class-i-antigen-processing-machinery-expression-in-merkel-cell-carcinoma
#4
Cathrin Ritter, Kaiji Fan, Annette Paschen, Sine Reker Hardrup, Soldano Ferrone, Paul Nghiem, Selma Ugurel, David Schrama, Jürgen C Becker
Merkel cell carcinoma (MCC) is a rare and aggressive, yet highly immunogenic skin cancer. The latter is due to its viral or UV-associated carcinogenesis. For tumor progression MCC has to escape the host's immuno-surveillance, e.g. by loss of HLA class-I expression. Indeed, a reduced HLA class-I expression was observed in MCC tumor tissues and MCC cell lines. This reduced HLA class-I surface expression is caused by an impaired expression of key components of the antigen processing machinery (APM), including LMP2 and LMP7 as well as TAP1 and TAP2...
May 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28534661/characterization-of-human-fetal-brain-endothelial-cells-reveals-barrier-properties-suitable-for-in%C3%A2-vitro-modeling-of-the-bbb-with-syngenic-co-cultures
#5
Allison M Andrews, Evan M Lutton, Lee A Cannella, Nancy Reichenbach, Roshanak Razmpour, Matthew J Seasock, Steven J Kaspin, Steven F Merkel, Dianne Langford, Yuri Persidsky, Servio H Ramirez
Endothelial cells (ECs) form the basis of the blood-brain barrier (BBB), a physical barrier that selectively restricts transport into the brain. In vitro models can provide significant insight into BBB physiology, mechanisms of human disease pathology, toxicology, and drug delivery. Given the limited availability of primary human adult brain microvascular ECs ( aBMVECs), human fetal tissue offers a plausible alternative source for multiple donors and the opportunity to build syngenic tri-cultures from the same host...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28512245/merkel-cell-polyomavirus-small-t-antigen-initiates-merkel-cell-carcinoma-like-tumor-development-in-mice
#6
Monique E Verhaegen, Doris Mangelberger, Paul W Harms, Markus Eberl, Dawn M Wilbert, Julia Meireles, Christopher K Bichakjian, Thomas L Saunders, Sunny Y Wong, Andrzej A Dlugosz
Merkel cell carcinoma (MCC) tumor cells express several markers detected in normal Merkel cells, a non-proliferative population of neuroendocrine cells which arise from epidermis. MCCs frequently contain Merkel cell polyomavirus (MCPyV) DNA and express viral transforming antigens, sT and tLT, but the role of these putative oncogenes in MCC development, and this tumor's cell of origin, are unknown. Using a panel of pre-term transgenic mice, we show that epidermis-targeted co-expression of sT and the cell fate determinant atonal bHLH transcription factor 1 (Atoh1) leads to development of widespread cellular aggregates with histology and marker expression mimicking that of human intraepidermal MCC...
May 16, 2017: Cancer Research
https://www.readbyqxmd.com/read/28507493/comparison-of-the-incidence-of-skin-cancers-in-patients-on-dialysis-and-after-kidney-transplantation
#7
Joanna Sułowicz, Anna Wojas-Pelc, Ewa Ignacak, Katarzyna Krzanowska, Marek Kuźniewski, Władysław Sułowicz
INTRODUCTION: Kidney transplant (KTx) patients on immunosuppressive therapy are predisposed to the development of infections and cancers. AIM: To compare the incidence and type of malignant skin lesions in kidney transplant patients and the dialyzed population based on the initiated dermatologic screening. MATERIAL AND METHODS: The study included 598 patients: 486 kidney transplant recipients and 112 patients on maintenance dialysis. All the patients underwent dermatological examination...
April 2017: Postȩpy Dermatologii i Alergologii
https://www.readbyqxmd.com/read/28502121/merkel-cell-carcinoma-morphologic-aspects-on-reflectance-confocal-microscopy
#8
Caterina Longo, Elisa Benati, Stefania Borsari, Caterina Bombonato, Riccardo Pampena, Elvira Moscarella, Simonetta Piana, Giovanni Pellacani
Merkel cell carcinoma (MCC) is an uncommon skin tumour with aggressive behaviour. Clinically, MCC usually appear as a fast growing red cherry nodule on the leg or face of elderly patients (1-4). Dermoscopically, it might reveal a reddish background with arborizing not in focus vessels, a pattern that is rather aspecific. Thus, the final diagnosis is routinely made by histopathologic examination and specific immunohistochemical stainings. This article is protected by copyright. All rights reserved.
May 14, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28497550/metagenomics-analysis-of-red-blood-cell-and-fresh-frozen-plasma-units
#9
Pierre Lau, Samuel Cordey, Francisco Brito, Diderik Tirefort, Thomas J Petty, Lara Turin, Arthur Guichebaron, Mylène Docquier, Evgeny M Zdobnov, Sophie Waldvogel-Abramowski, Thomas Lecompte, Laurent Kaiser, Olivier Preynat-Seauve
BACKGROUND: Although the risk of transmitting infectious agents by blood transfusion is dramatically reduced after donor selection, leukoreduction, and laboratory testing, some could still be present in donor's blood. A description of metagenomes in blood products eligible for transfusion represents relevant information to evaluate the risk of pathogen transmission by transfusion. STUDY DESIGN AND METHODS: Detection of viruses, bacteria, and fungi genomes was made by high-throughput sequencing (HTS) of 600 manufactured blood products eligible for transfusion: 300 red blood cell (RBC) and 300 fresh-frozen plasma (FFP) units...
May 11, 2017: Transfusion
https://www.readbyqxmd.com/read/28495499/definitive-radiotherapy-for-merkel-cell-carcinoma-confers-clinically-meaningful-in-field-locoregional-control-a-review-and-analysis-of-the-literature
#10
REVIEW
Dakshika A Gunaratne, Julie R Howle, Michael J Veness
BACKGROUND: Merkel cell carcinoma (MCC) is an uncommon radiosensitive, neuroendocrine malignancy. Treatment often involves surgery; however, older, sicker patients may not be candidates for an operation. Institutions have published data favoring the role of definitive radiotherapy for macroscopic locoregional disease. OBJECTIVE: Our objective was to report the outcome of patients treated with definitive radiotherapy. METHODS: We performed a systematic review of Medline, PubMed, and Embase databases for reported cases or series of definitive radiotherapy for macroscopic locoregional MCC...
May 8, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28488596/the-impact-of-microfluidic-mixing-of-triblock-micelleplexes-on-in-vitro-formula-see-text-in-vivo-gene-silencing-and-intracellular-trafficking
#11
Daniel P Feldmann, Yuran Xie, Steven K Jones, Dongyue Yu, Anna Moszczynska, Olivia M Merkel
The triblock copolymer polyethylenimine-polycaprolactone-polyethylene glycol (PEI-PCL-PEG) has been shown to spontaneously assemble into nano-sized particulate carriers capable of complexing with nucleic acids for gene delivery. The objective of this study was to investigate micelleplex characteristics, their in vitro and in vivo fate following microfluidic preparation of siRNA nanoparticles compared to the routinely used batch reactor mixing technique. Herein, PEI-PCL-PEG nanoparticles were prepared with batch reactor or microfluidic mixing techniques and characterized by various biochemical assays and in cell culture...
June 2, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28484898/virus-induced-cancers-of-the-skin-and-mucosa-are-we-dealing-with-smoking-guns-or-smoke-and-mirrors-in-the-operating-theatre
#12
Peter K C Goon, Patrick K Y Goon, Eunice K H Tan, Robin A F Crawford, Nick J Levell, Holger Sudhoff
INTRODUCTION: Human papillomavirus (HPV) alone is thought to cause ~610,000 cases of cancer per year, and is the dominant aetiological agent for ano-genital (esp. cervical) and head and neck cancers (esp. oropharyngeal). Merkel cell polyomavirus (MCV) is a more recently discovered virus which causes Merkel cell carcinoma, a rare but highly aggressive skin malignancy. METHODS: We explored the available published evidence to see if transmission of live HPV or MCV virus in smoke generated by laser or diathermy was feasible, and would pose an infection risk...
May 8, 2017: Dermatology and Therapy
https://www.readbyqxmd.com/read/28473299/single-synchronous-liver-metastasis-from-merkel-cell-carcinoma-mimicking-a-klatskin-tumor-a-diagnostic-challenge
#13
Giovanni Vennarecci, Antonella Tudisco, Francesca Cancellario d'Alena, Giuseppe M Ettorre
No abstract text is available yet for this article.
April 14, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/28470889/in-vitro-induction-of-human-regulatory-t-cells-itregs-using-conditions-of-low-tryptophan-plus-kynurenines
#14
K L Hippen, R S O'Connor, A M Lemire, A Saha, E A Hanse, N C Tennis, S C Merkel, A Kelekar, J L Riley, B L Levine, C H June, L S Kean, M L MacMillan, J S Miller, J E Wagner, D H Munn, B R Blazar
Thymic regulatory T cells (tTreg) or induced Tregs (iTregs) suppress murine acute graft-versus-host disease (GVHD). Previously we demonstrated that plasmacytoid dendritic cell (pDC) indoleamine 2,3-dioxygenase (IDO) fosters the in vitro development of human iTregs via tryptophan depletion and kynurenine (Kyn) metabolites. We now show that stimulation of naïve CD4+ T cells in low tryptophan (Low Trp) plus Kyn supports human iTreg generation. In vitro, low Trp+Kyn iTreg and tTregs potently suppress Teffector cell proliferation equivalently but are phenotypically distinct...
May 4, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28461484/protein-mediated-viral-latency-is-a-novel-mechanism-for-merkel-cell-polyomavirus-persistence
#15
Hyun Jin Kwun, Yuan Chang, Patrick S Moore
Viral latency, in which a virus genome does not replicate independently of the host cell genome and produces no infectious particles, is required for long-term virus persistence. There is no known latency mechanism for chronic small DNA virus infections. Merkel cell polyomavirus (MCV) causes an aggressive skin cancer after prolonged infection and requires an active large T (LT) phosphoprotein helicase to replicate. We show that evolutionarily conserved MCV LT phosphorylation sites are constitutively recognized by cellular Fbw7, βTrCP, and Skp2 Skp-F-box-cullin (SCF) E3 ubiquitin ligases, which degrade and suppress steady-state LT protein levels...
May 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28461473/ildr1-is-important-for-paracellular-water-transport-and-urine-concentration-mechanism
#16
Yongfeng Gong, Nina Himmerkus, Abby Sunq, Susanne Milatz, Cosima Merkel, Markus Bleich, Jianghui Hou
Whether the tight junction is permeable to water remains highly controversial. Here, we provide evidence that the tricellular tight junction is important for paracellular water permeation and that Ig-like domain containing receptor 1 (ILDR1) regulates its permeability. In the mouse kidney, ILDR1 is localized to tricellular tight junctions of the distal tubules. Genetic knockout of Ildr1 in the mouse kidney causes polyuria and polydipsia due to renal concentrating defects. Microperfusion of live renal distal tubules reveals that they are impermeable to water in normal animals but become highly permeable to water in Ildr1 knockout animals whereas paracellular ionic permeabilities in the Ildr1 knockout mouse renal tubules are not affected...
May 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28458773/a-review-of-the-global-guidelines-on-surgical-margins-for-nonmelanoma-skin-cancers
#17
REVIEW
Amanda F Nahhas, Chase A Scarbrough, Shannon Trotter
Background: Adequate treatment and follow-up of a patient with nonmelanoma skin cancer is of utmost concern for a clinician. However, there is a lack of international consensus on recommendations for surgical excision margins. Furthermore, lack of familiarity of the published guidelines leads to a variety in practice styles. Objective: To compare the consistency in global recommendations for surgical excision margins for basal cell carcinoma, cutaneous squamous cell carcinoma, dermatofibrosarcoma protuberans, and Merkel cell carcinoma...
April 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28456944/avelumab-first-global-approval
#18
Esther S Kim
Avelumab (Bavencio(®)) is an intravenously administered programmed cell death ligand-1-blocking human antibody initially developed by EMD Serono Inc. (the biopharmaceutical division of Merck KGaA, Darmstadt, Germany) [now jointly developed and commercialized by EMD Serono Inc. and Pfizer] for the treatment of various tumours. It has received accelerated approval in the USA for the treatment of metastatic Merkel cell carcinoma (mMCC) in adults and paediatric patients aged ≥12 years. The marketing authorization application for avelumab in the treatment of mMCC is undergoing regulatory review in the EU, the biologics license application for avelumab in the treatment of urothelial carcinoma is undergoing priority review by the FDA, and avelumab is in various stages of development internationally for a variety of cancers...
May 2017: Drugs
https://www.readbyqxmd.com/read/28455138/evaluation-of-merkel-cell-polyomavirus-in-non-small-cell-lung-cancer-and-adjacent-normal-cells
#19
Anahita Behdarvand, Mohammad Saber Zamani, Farzin Sadeghi, Yousef Yahyapour, Farzam Vaziri, Fatemeh Rahimi Jamnani, Bahareh Nowruzi, Abolfazl Fateh, Seyed Davar Siadat
Several risk factors have been linked to lung cancer (LC). Nevertheless, a viral etiology has been mentioned for a subset of patients developing LC. The aim of this study was to evaluate the effect of Merkel cell polyomavirus (MCPyV) on developing non-small cell lung cancer (NSCLCs). In total, 96 paraffin-embedded NSCLC biopsies and 96 adjacent non-LC normal specimens were analyzed by quantitative real-time polymerase chain reaction (PCR) for the existence of the MCPyV DNA and the expressions of RNA transcripts...
April 25, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28445980/the-pp4r1-sub-unit-of-protein-phosphatase-pp4-is-essential-for-inhibition-of-nf-%C3%AE%C2%BAb-by-merkel-polyomavirus-small-tumour-antigen
#20
Hussein Abdul-Sada, Marietta Müller, Rajni Mehta, Rachel Toth, J Simon C Arthur, Adrian Whitehouse, Andrew Macdonald
Merkel cell carcinoma (MCC) is a highly aggressive skin cancer with a high metastatic potential. The majority of MCC cases are caused by the Merkel cell polyomavirus (MCPyV), through expression of the virus-encoded tumour antigens. Whilst mechanisms attributing tumour antigen expression to transformation are being uncovered, little is known of the mechanisms by which MCPyV persists in the host. We previously identified the MCPyV small T antigen (tAg) as a novel inhibitor of nuclear factor kappa B (NF-kB) signalling and a modulator of the host anti-viral response...
April 11, 2017: Oncotarget
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