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Wagner K, Wilson J. LB1498 Online skin disease hoaxes: An evaluation of scope and potential impact. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.06.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Rosenkranz B, Niebel W, Albrecht K, Wagner K, Philipp T, Eigler FW. The use of OKT3 in steroid-resistant rejections following cadaveric kidney transplantation. Transpl Int 2018. [DOI: 10.1111/tri.1992.5.s1.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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De Jong G, Bartels L, Kedde M, Verdegaal E, Yasuda E, Helden PV, Wagner K, Schotte R, Spits H, Hazenberg M. PO-434 AT1413 antibody derived from a cured AML patient recognisesa unique sialylated CD43 epitope shared by AML, MDS and melanoma cells. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Bartels L, Jong GD, Yasuda E, Kattler V, Bakker A, Villaudy J, Helden PV, Hazenberg M, Spits H, Wagner K. PO-436 Retargeting T-cell cytotoxicity to a unique sialylated epitope on CD43 expressed by acute myeloid leukaemia. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Schotte R, Wagner K, Fatamawati C, Go D, Claassen Y, Bakker A, Spits H, Pos W. PO-402 Establishment of human monoclonal anti tumour antibodies with high affinity to CD9 using an in vitro B cell affinity maturation platform. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Koletzko B, Jochum F, Saadi S, Stajer K, Wagner K, Zylajew W, Claßen M. Untergewicht und Mangelernährung bei pädiatrischen Patienten. Monatsschr Kinderheilkd 2018. [DOI: 10.1007/s00112-018-0475-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wagner K, Springer B, Pires VP, Keller PM. Molecular detection of fungal pathogens in clinical specimens by 18S rDNA high-throughput screening in comparison to ITS PCR and culture. Sci Rep 2018; 8:6964. [PMID: 29725065 PMCID: PMC5934447 DOI: 10.1038/s41598-018-25129-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 04/13/2018] [Indexed: 12/30/2022] Open
Abstract
The rising incidence of invasive fungal infections and the expanding spectrum of fungal pathogens makes early and accurate identification of the causative pathogen a daunting task. Diagnostics using molecular markers enable rapid identification of fungi, offer new insights into infectious disease dynamics, and open new possibilities for infectious disease control and prevention. We performed a retrospective study using clinical specimens (N = 233) from patients with suspected fungal infection previously subjected to culture and/or internal transcribed spacer (ITS) PCR. We used these specimens to evaluate a high-throughput screening method for fungal detection using automated DNA extraction (QIASymphony), fungal ribosomal small subunit (18S) rDNA RT-PCR and amplicon sequencing. Fungal sequences were compared with sequences from the curated, commercially available SmartGene IDNS database for pathogen identification. Concordance between 18S rDNA RT-PCR and culture results was 91%, and congruence between 18S rDNA RT-PCR and ITS PCR results was 94%. In addition, 18S rDNA RT-PCR and Sanger sequencing detected fungal pathogens in culture negative (N = 13) and ITS PCR negative specimens (N = 12) from patients with a clinically confirmed fungal infection. Our results support the use of the 18S rDNA RT-PCR diagnostic workflow for rapid and accurate identification of fungal pathogens in clinical specimens.
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Wagner K, Zotz G. Epiphytic bromeliads in a changing world: the effect of elevated CO 2 and varying water supply on growth and nutrient relations. PLANT BIOLOGY (STUTTGART, GERMANY) 2018; 20:636-640. [PMID: 29427326 DOI: 10.1111/plb.12708] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 02/06/2018] [Indexed: 06/08/2023]
Abstract
Global climate change is likely to impact all plant life. Vascular epiphytes represent a life form that may be affected more than any other by possible changes in precipitation leading to water shortage, but negative effects of drought may be mitigated through increasing levels of atmospheric CO2 . We studied the response of three epiphytic Aechmea species to different CO2 and watering levels in a full-factorial climate chamber study over 100 days. All species use crassulacean acid metabolism (CAM). Response variables were relative growth rate (RGR), nocturnal acidification and foliar nutrient levels (N, P, K, Mg). Both elevated CO2 and increased water supply stimulated RGR, but the interaction of the two factors was not significant. Nocturnal acidification was not affected by these factors, indicating that the increase in growth in these CAM species was due to higher assimilation in the light. Mass-based foliar nutrient contents were consistently lower under elevated CO2 , but most differences disappeared when expressed on an area basis. Compared to previous studies with epiphytes, in which doubling of CO2 increased RGR, on average, by only 14%, these Aechmea species showed a relatively strong growth stimulation of up to +61%. Consistent with earlier findings with other bromeliads, elevated CO2 did not mitigate the effect of water shortage.
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Schultze G, Wagner K, Neumayer HH, Fitzner R, Molzahn M. Effect of Dialyzer Membranes on in Vitro Generation of Eicosanoids. Int J Artif Organs 2018. [DOI: 10.1177/039139888701000412] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Eicosanoids are potent substances released from blood cells after contact with foreign materials. Eicosanoid generation, in addition to complement fragment formation, may be a valuable indicator of the biocompatibility of dialyzer membranes. In the present in vitro study, eicosanoid generation induced by several different flat dialyzer membranes [polyacrylonitrile (PAN), cuprammonium cellulose (CC), and polycarbonate (PC)] was evaluated and compared using blood from non-uremic healthy volunteers. Generation of prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) was greatest with PC followed by PAN and CC. The formation of C3a des arg with PAN was less than with either CC or PC. Our results suggest that dialyzer membranes affect complement activation and eicosanoid generation differently; biocompatibility as expressed by a low level of complement fragment formation does not necessarily translate into biocompatibility when considering eicosanoid generation.
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Kunz K, Wagner K, Mendler L, Hölper S, Dehne N, Müller S. SUMO Signaling by Hypoxic Inactivation of SUMO-Specific Isopeptidases. Cell Rep 2017; 16:3075-3086. [PMID: 27626674 DOI: 10.1016/j.celrep.2016.08.031] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 07/13/2016] [Accepted: 08/09/2016] [Indexed: 11/24/2022] Open
Abstract
Post-translational modification of proteins with ubiquitin-like SUMO modifiers is a tightly regulated and highly dynamic process. The SENP family of SUMO-specific isopeptidases comprises six cysteine proteases. They are instrumental in counterbalancing SUMO conjugation, but their regulation is not well understood. We demonstrate that in hypoxic cell extracts, the catalytic activity of SENP family members, in particular SENP1 and SENP3, is inhibited in a rapid and fully reversible process. Comparative mass spectrometry from normoxic and hypoxic cells defines a subset of hypoxia-induced SUMO1 targets, including SUMO ligases RanBP2 and PIAS2, glucose transporter 1, and transcriptional regulators. Among the most strongly induced targets, we identified the transcriptional co-repressor BHLHE40, which controls hypoxic gene expression programs. We provide evidence that SUMOylation of BHLHE40 is reversed by SENP1 and contributes to transcriptional repression of the metabolic master regulator gene PGC-1α. We propose a pathway that connects oxygen-controlled SENP activity to hypoxic reprogramming of metabolism.
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Gidaro T, Moraux A, Grelet M, Gasnier E, Villeret M, Annoussamy M, Vissing J, Attarian S, Mozaffar T, Iyadurai S, Wagner K, Walker G, Richiardi A, Shukla S, Vissière D, Servais L. ActiMyo home monitoring in adult patients with limb girdle muscular dystrophy type 2B and facioscapulohumeral muscular dystrophy in study ATYR 1940-C-004. Neuromuscul Disord 2017. [DOI: 10.1016/j.nmd.2017.06.474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Shirsath N, Wagner K, Ober J, Mayer G, Schlederer M, Roos S, Kenner L, Wolf P. 635 PUVA diminishes imiquimod-induced psoriatic phenotype with gene expression signature associated with senescence. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Franco R, Weiner M, Wagner K, Martelo O, Ragno G, Pivacek L, Valeri C. The 24-Hour Posttransfusion Survival and Lifespan of
Autologous Baboon Red Cells Treated with Inositol
Hexaphosphate-Polyethylene Glycol or Inositol
Hexaphosphate-Adenosine Triphosphate-Polyethylene Glycol to
Decrease Oxygen Affinity. Vox Sang 2017. [DOI: 10.1159/000461845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tsai FP, Jakobsson J, Catton I, Dhir VK, Squarer D, Hochreiter LE, Pieczynski AT, Cho DH, Armstrong DR, Chan SH, Bober M, Singer J, Wagner K, Hofmann G, Laue H, Kerz KH, Lipinski RJ, Barleon L, Thomauske K, Werle H, Hobbins RR, Cook BA, Mason RE, Licina GJ, Springer DR, Roy P, Gonda K, Oka K, Hayashi K, Dienst W, Hofmann P, Kerwin-Peck DK, Petschel M, Zappe D, Rees TF, Cleveland JM, Nash KL, Tachikawa E, Hoshi M, Sagawa C, Yonezawa C, Nakashima M, Kocamustafaogullari G, Ishii M, Thornton EW. Authors. NUCL TECHNOL 2017. [DOI: 10.13182/nt84-a33366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Wagner K, Fittig E, Kunze J. Prävention von Anfang an: Praktische Umsetzung und Wirksamkeit der Mutter-Kind-Behandlung in der Celenus Klinik Carolabad. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1598143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Wagner K, Lee KSS, Yang J, Hammock BD. Epoxy fatty acids mediate analgesia in murine diabetic neuropathy. Eur J Pain 2016; 21:456-465. [PMID: 27634339 DOI: 10.1002/ejp.939] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Neuropathic pain is a debilitating condition with no adequate therapy. The health benefits of omega-3 fatty acids are established, however, the role of docosahexaenoic acid (DHA) in limiting pain has only recently been described and the mechanisms of this action remain unknown. DHA is metabolized into epoxydocosapentanoic acids (EDPs) via cytochrome P450 (CYP450) enzymes which are substrates for the soluble epoxide hydrolase (sEH) enzyme. Here, we tested several hypotheses; first, that the antinociceptive action of DHA is mediated by the EDPs. Second, based on evidence that DHA and CYP450 metabolites elicit analgesia through opioid signalling, we investigated this as a possible mechanism of action. Third, we tested whether the analgesia mediated by epoxy fatty acids had similar rewarding effects as opioid analgesics. METHODS We tested diabetic neuropathic wild-type and sEH null mice in a conditioned place preference assay for their response to EDPs, sEHI and antagonism of these treatments with naloxone, a mu-opioid receptor antagonist. RESULTS The EDPs and sEH inhibitors were efficacious against chronic pain, and naloxone antagonized the action of both EDPs and sEH inhibitors. Despite this antagonism, the sEH inhibitors lacked reward side effects differing from opioids. CONCLUSIONS The EpFA are analgesic against chronic pain differing from opioids which have limited efficacy in chronic conditions. SIGNIFICANCE EDPs and sEHI mediate analgesia in modelled chronic pain and this analgesia is blocked by naloxone. However, unlike opioids, sEHI are highly effective in neuropathic pain models and importantly lack rewarding side effects.
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Kunze J, Wagner K, Fittig E. [Practical implementation of an integrated care model in mother-child treatment]. DER NERVENARZT 2016; 87:974-9. [PMID: 27531206 DOI: 10.1007/s00115-016-0186-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This article summarizes the specific treatment options in the combined mother-child treatment for women with postpartum psychiatric disorders. The incidence of postpartum mental illness is high, especially for postpartum depression that probably occurs in10-15 % of cases. Mental disorders not only have a negative impact on the mental health of the women affected, such as chronification and suicidal tendencies but can also adversely affect the mother-child relationship as well as the emotional and cognitive development of the child. For these reasons it is important, also under the aspects of a primary prevention with respect to the children of mentally ill mothers, to provide a needs-oriented, timely and disorder-specific interactional therapy, which also considers the long-term aspects of treatment. At the Celenus Klinik Carolabad in Chemnitz an integrated treatment model, the "Carola PLUS", could be established that caters for the particularly high demands of combined care and treatment for both mother and child.
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Wagner K, Kákay A, Schultheiss K, Henschke A, Sebastian T, Schultheiss H. Magnetic domain walls as reconfigurable spin-wave nanochannels. NATURE NANOTECHNOLOGY 2016; 11:432-6. [PMID: 26828849 DOI: 10.1038/nnano.2015.339] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Accepted: 12/16/2015] [Indexed: 05/26/2023]
Abstract
In the research field of magnonics, it is envisaged that spin waves will be used as information carriers, promoting operation based on their wave properties. However, the field still faces major challenges. To become fully competitive, novel schemes for energy-efficient control of spin-wave propagation in two dimensions have to be realized on much smaller length scales than used before. In this Letter, we address these challenges with the experimental realization of a novel approach to guide spin waves in reconfigurable, nano-sized magnonic waveguides. For this purpose, we make use of two inherent characteristics of magnetism: the non-volatility of magnetic remanence states and the nanometre dimensions of domain walls formed within these magnetic configurations. We present the experimental observation and micromagnetic simulations of spin-wave propagation inside nano-sized domain walls and realize a first step towards a reconfigurable domain-wall-based magnonic nanocircuitry.
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Schneider A, Wagner K, Rakozy C, Stolte C, Bothur-Schäfer P, Welcker T, Choly N, Roesgen A, Rothe H, Böhmer G. Cervical Strip Biopsy for High-Grade Cervical Intraepithelial Lesions: a Valid Alternative to Conventional Punch Technique. Geburtshilfe Frauenheilkd 2015; 75:1063-1068. [PMID: 28435170 DOI: 10.1055/s-0035-1557816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
Introduction: To evaluate, if targeted strip biopsies decrease trauma/pain perception while maintaining diagnostic accuracy in patients with the diagnosis of high-grade squamous intraepithelial lesions of the uterine cervix. Patients and Methods: Between July 1st and December 31st 2014 we performed colposcopically directed strip biopsies in 102 patients with colposcopic suspicion of high-grade squamous intraepithelial lesions of the uterine cervix. We used a 3 mm curette for harvesting tissue samples under VITOM® videocolposcopy. So far, 60 patients underwent additional loop excision. Histologic examination of strip biopsies and loop specimens included routine hematoxylin and eosin staining as well as immunohistochemical staining for p16, Ki 67 and stathmin-1. Results: 55 patients (53 %), were histologically diagnosed with cervical intraepithelial neoplasia grade 3 on strip biopsies. Adenocarcinoma in situ was diagnosed in 2 patients (2 %), cervical intraepithelial neoplasia grade 2 in 35 patients (34 %), and cervical intraepithelial neoplasia grade 1 in 10 patients (10 %). The agreement between histologic results of strip biopsy and loop specimen was highly significant: In all 60 strip biopsies diagnosed with high-grade squamous intraepithelial lesions this diagnosis was confirmed histologically during follow-up loop specimen excision (high-grade squamous intraepithelial lesions in 58 patients, invasive disease in 2 patients). The pain level experienced during strip biopsy was rated on average 0.25 on a scale from 0 to 10. No clinically significant bleeding was reported. Conclusion: Targeted strip biopsies with a 3 mm curette are a reliable procedure to diagnose high-grade squamous intraepithelial lesions of the uterine cervix and yield high patient satisfaction (Video 1).
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Muin D, Wagner K, Burian R, Ghaem Maghami N, Hösli I, Lapaire O. Tuberkulom in der Schwangerschaft. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1555053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Schultze G, Wagner K, Neumayer HH, Molzahn M. Eicosanoid release as an indicator of membrane biocompatibility. CONTRIBUTIONS TO NEPHROLOGY 2015; 59:44-50. [PMID: 3442987 DOI: 10.1159/000414614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Maier B, Wagner K, Behrens S, Bruch L, Busse R, Schmidt D, Schühlen H, Thieme R, Theres H. [Deterministic record linkage with indirect identifiers: data of the Berlin Myocardial Infarction Registry and the AOK Nordost for patients with myocardial infarction]. DAS GESUNDHEITSWESEN 2015; 77:e15-9. [PMID: 25714193 DOI: 10.1055/s-0034-1395642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AIM OF THE STUDY How can 2 pseudonymised data sets be linked? Using the example of data from the Berlin Myocardial Infarction Registry and from a German sickness fund (AOK Nordost) we will demonstrate how record linkage can be achieved without personal identifiers. METHODS In different steps the method of deterministic record linkage with indirect identifiers: age, sex, hospital admission date and time, will be explained. RESULTS We were able to show that 80.6% of the expected maximum number of patients were matched with our approach. As a result we had no duplicate matches in the linkage process, where one AOK patient was linked to 2 or more BMIR patients or vice versa. The matching variables produced enough uniqueness to be used as indirect patient identifiers. CONCLUSION Deterministic record linkage with the following indirect indicators: age, sex, hospital admission date and time was possible in our study of patients with myocardial infarction in a circumscribed geographical region, which limited the number of cases and avoided mismatches.
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Stahl FR, Keyser KA, Heller K, Bischoff Y, Halle S, Wagner K, Messerle M, Förster R. Mck2-dependent infection of alveolar macrophages promotes replication of MCMV in nodular inflammatory foci of the neonatal lung. Mucosal Immunol 2015; 8:57-67. [PMID: 24894498 DOI: 10.1038/mi.2014.42] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 04/15/2014] [Indexed: 02/08/2023]
Abstract
Infection with cytomegalovirus (CMV) shows a worldwide high prevalence with only immunocompromised individuals or newborns to become symptomatic. The host's constitution and the pathogen's virulence determine whether disease occurs after infection. Mouse CMV (MCMV) is an appreciated pathogen for in vivo investigation of host-pathogen interactions. It has recently been reported that a single base pair deletion can spontaneously occur in the open reading frame of MCMV-encoded chemokine 2 (MCK2), preventing the expression of the full-length gene product. To study the consequences of this mutation, we compared the Mck2-defective reporter virus MCMV-3D with the newly generated repaired Mck2(+) mutant MCMV-3DR. Compared with MCMV-3D, neonatal mice infected with MCMV-3DR showed severe viral disease after lung infection. Viral disease coincided with high viral activity in multiple organs and increased virus replication in previously described nodular inflammatory foci (NIF) in the lung. Notably, MCMV-3DR showed tropism for alveolar macrophages in vitro and in vivo, whereas MCMV-3D did not infect this cell type. Moreover, in vivo depletion of alveolar macrophages reduced MCMV-3DR replication in the lung. We proposed an Mck2-mediated mechanism by which MCMV exploits alveolar macrophages to increase replication upon first encounter with the host's lung mucosa.
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Ravindran Menon D, Das S, Krepler C, Vultur A, Rinner B, Schauer S, Kashofer K, Wagner K, Zhang G, Bonyadi Rad E, Haass NK, Soyer HP, Gabrielli B, Somasundaram R, Hoefler G, Herlyn M, Schaider H. A stress-induced early innate response causes multidrug tolerance in melanoma. Oncogene 2014; 34:4448-59. [PMID: 25417704 DOI: 10.1038/onc.2014.372] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/07/2014] [Accepted: 10/03/2014] [Indexed: 02/07/2023]
Abstract
Acquired drug resistance constitutes a major challenge for effective cancer therapies with melanoma being no exception. The dynamics leading to permanent resistance are poorly understood but are important to design better treatments. Here we show that drug exposure, hypoxia or nutrient starvation leads to an early innate cell response in melanoma cells resulting in multidrug resistance, termed induced drug-tolerant cells (IDTCs). Transition into the IDTC state seems to be an inherent stress reaction for survival toward unfavorable environmental conditions or drug exposure. The response comprises chromatin remodeling, activation of signaling cascades and markers implicated in cancer stemness with higher angiogenic potential and tumorigenicity. These changes are characterized by a common increase in CD271 expression concomitantly with loss of differentiation markers such as melan-A and tyrosinase, enhanced aldehyde dehydrogenase (ALDH) activity and upregulation of histone demethylases. Accordingly, IDTCs show a loss of H3K4me3, H3K27me3 and gain of H3K9me3 suggesting activation and repression of differential genes. Drug holidays at the IDTC state allow for reversion into parental cells re-sensitizing them to the drug they were primarily exposed to. However, upon continuous drug exposure IDTCs eventually transform into permanent and irreversible drug-resistant cells. Knockdown of CD271 or KDM5B decreases transition into the IDTC state substantially but does not prevent it. Targeting IDTCs would be crucial for sustainable disease management and prevention of acquired drug resistance.
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Morosini D, Wang K, Wagner K, Gershenhorn B, Yelensky R, Lipson D, Chmielecki J, Ali S, Ross J, Stephens P, Miller V. 415 Comprehensive next generation sequencing of solid tumors from 669 adolescents and young adults reveals a distinct spectrum of targetable genomic alterations. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70541-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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