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https://www.readbyqxmd.com/read/28618001/three-dimensional-cell-culture-models-for-anticancer-drug-screening-worth-the-effort
#1
REVIEW
Eddy-Tim Verjans, Jordi Doijen, Walter Luyten, Bart Landuyt, Liliane Schoofs
High attrition of new oncology drug candidates in clinical trials is partially caused by the poor predictive capacity of artificial monolayer cell culture assays early in drug discovery. Monolayer assays do not take the natural three-dimensional (3D) microenvironment of cells into account. As a result, false positive compounds often enter clinical trials, leading to high dropout rates and a waste of time and money. Over the past two decades, tissue engineers and cell biologists have developed a broad range of 3D in vitro culturing tools that better represent in vivo cell biology...
June 15, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28603948/limb-derived-cells-as-a-paradigm-for-engineering-self-assembling-skeletal-tissues
#2
Warnakulasuriya A Fernando, Ioannis Papantoniou, Luis F Mendes, Gabriella Nilsson Hall, Kathleen Bosmans, Wai L Tam, Liliana M Teixeira, Malcolm Moos, Liesbet Geris, Frank P Luyten
Mimicking developmental events has been proposed as a strategy to engineer tissue constructs for regenerative medicine. However, this approach has not yet been investigated for skeletal tissues. Here we demonstrate that ectopic implantation of mouse embryonic day 14.5 long bone anlagen, dissociated into single cells and randomly incorporated in a bioengineered construct, give rise to epiphyseal growth plate like structures, bone, and marrow, which share many morphological and molecular similarities to epiphyseal units that form after transplanting intact long bone anlage, demonstrating substantial robustness and autonomy of complex tissue self-assembly and the overall organogenesis process...
June 11, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28594312/warning-about-the-use-of-critical-size-defects-for-the-translational-study-of-bone-repair-analysis-of-a-sheep-tibial-model
#3
Johan Lammens, Marina Maréchal, Liesbet Geris, Joshua Vanderaa, Hadewych Van Hauwermeiren, Frank P Luyten, Hendrik Delport
The repair of large long bone defects requires complex surgical procedures as the bone loss cannot simply be replaced by autologous grafts due to an insufficient bone stock of the human body. Tissue engineering strategies and the use of Advanced Therapy Medicinal Products (ATMPs) for these reconstructions remain a considerable challenge, in particular since robust outcomes in well-defined large animal models are lacking. To be suitable as a model for treatment of human sized bone defects we developed a large animal model in both skeletally immature and mature sheep and made close observations on the spontaneous healing of defects...
June 8, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28575752/dynamic-and-static-knee-alignment-at-baseline-predict-structural-abnormalities-on-mri-associated-with-medial-compartment-knee-osteoarthritis-after-2-years
#4
Armaghan Mahmoudian, Jaap H van Dieёn, Sjoerd M Bruijn, Isabel A C Baert, Gert S Faber, Frank P Luyten, Sabine M P Verschueren
BACKGROUND: Dynamic and static varus alignment, both, have been reported as risk factors associated with structural progression of knee osteoarthritis. However the association of none of the static and dynamic alignment with structural, clinical, and functional progression associated with knee osteoarthritis has not been assessed yet in a longitudinal study. METHODS: Forty-seven women with early and established medial knee osteoarthritis were evaluated. Static and dynamic alignment as well as MRI detected structural features, clinical, and functional characteristics of patients were assessed at baseline and at 2 years follow-up...
May 24, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28574598/integrin-linked-kinase-regulates-bone-formation-by-controlling-cytoskeletal-organization-and-modulating-bmp-and-wnt-signaling-in-osteoprogenitors
#5
Marian Dejaeger, Anna-Marei Böhm, Naomi Dirckx, Joke Devriese, Elena Nefyodova, Ruben Cardoen, René St-Arnaud, Jos Tournoy, Frank P Luyten, Christa Maes
Cell-matrix interactions constitute a fundamental aspect of skeletal cell biology and play essential roles in bone homeostasis. These interactions are primarily mediated by transmembrane integrin receptors, which mediate cell adhesion and transduce signals from the extracellular matrix to intracellular responses via various downstream effectors, including integrin-linked kinase (ILK). ILK functions as adaptor protein at focal adhesion sites, linking integrins to the actin cytoskeleton, and has been reported to act as a kinase phosphorylating signaling molecules such as GSK-3β and Akt...
June 2, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28569524/mentalizing-as-a-mechanism-of-change-in-the-treatment-of-patients-with-borderline-personality-disorder-a-parallel-process-growth-modeling-approach
#6
Celine De Meulemeester, Kristof Vansteelandt, Patrick Luyten, Benedicte Lowyck
Although a number of effective psychotherapeutic treatments have been developed for borderline personality disorder (BPD), little is known about the mechanisms of change explaining the effects of these treatments. There is increasing evidence that impairments in mentalizing or reflective functioning-the capacity to reflect on the internal mental states of the self and others-are a central feature of BPD. To date, no study has directly investigated the core assumption of the mentalization-based approach to BPD, that changes in this capacity are associated with treatment outcome in BPD patients...
June 1, 2017: Personality Disorders
https://www.readbyqxmd.com/read/28543929/prevalence-and-impact-of-childhood-adversities-and-post-traumatic-stress-disorder-in-women-with-fibromyalgia-and%C3%A2-chronic-widespread-pain
#7
E Coppens, P Van Wambeke, B Morlion, N Weltens, H Giao Ly, J Tack, P Luyten, L Van Oudenhove
OBJECTIVE: This study investigates the prevalence of different types of childhood adversities (CA) and posttraumatic stress disorder (PTSD) in female patients with Fibromyalgia or Chronic Widespread Pain (FM/CWP) compared to patients with Functional Dyspepsia (FD) and achalasia. In FM/CWP, we also investigated the association between CA and PTSD on the one hand and pain severity on the other. METHODS: Patient samples consisted of 154 female FM/CWP, 83 female FD and 53 female achalasia patients consecutively recruited from a tertiary care hospital...
May 24, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28506841/definition-of-critical-size-osteochondral-defect-and-it-s-the-negative-effect-to-the-surrounding-articular-cartilage-in-the-rat-knee
#8
H Katagiri, L F Mendes, F P Luyten
BACKGROUND: Joint trauma is predisposing to the incidence of osteoarthritis (OA) of the knee. There is a limited knowledge on the impact of posttraumatic osteochondral defects on the whole joint. This study was designed to define a critical size osteochondral defect in the knee of rats and to investigate a possible association between osteochondral defects and degeneration of the surrounding joint surface. METHODS: Cylindrical osteochondral defects of different sizes were created in the knee joint of rats...
May 12, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28472162/the-parental-reflective-functioning-questionnaire-development-and-preliminary-validation
#9
Patrick Luyten, Linda C Mayes, Liesbet Nijssens, Peter Fonagy
This paper reports on three studies on the development and validation of the Parental Reflective Functioning Questionnaire (PRFQ), a brief, multidimensional self-report measure that assesses parental reflective functioning or mentalizing, that is, the capacity to treat the infant as a psychological agent. Study 1 investigated the factor structure, reliability, and relationships of the PRFQ with demographic features, symptomatic distress, attachment dimensions, and emotional availability in a socially diverse sample of 299 mothers of a child aged 0-3...
2017: PloS One
https://www.readbyqxmd.com/read/28448663/prame-as-a-potential-target-for-immunotherapy-in-metastatic-uveal-melanoma
#10
Gülçin Gezgin, Sietse J Luk, Jinfeng Cao, Mehmet Dogrusöz, Dirk M van der Steen, Renate S Hagedoorn, Daniëlle Krijgsman, Pieter A van der Velden, Matthew G Field, Gregorius P M Luyten, Karoly Szuhai, J William Harbour, Ekaterina S Jordanova, Mirjam H M Heemskerk, Martine J Jager
Importance: Uveal melanoma (UM) is an intraocular primary malignant neoplasm that often gives rise to metastatic disease for which there are no effective therapies. A substantial proportion of UMs express the cancer-testis antigen PRAME (preferentially expressed antigen in melanoma), which can potentially be targeted by adoptive T-cell therapy. Objective: To determine whether there may be a rationale for PRAME-directed T-cell therapy for metastatic UM. Design, Setting, and Participants: An experimental study using a retrospective cohort of 64 patients with UM (median follow-up, 62 months) was conducted from January 8, 2015, to November 20, 2016, at the Leiden University Medical Center...
June 1, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28447814/undetected-scars-self-criticism-attachment-and-romantic-relationships-among-otherwise-well-functioning-childhood-sexual-abuse-survivors
#11
Dana Lassri, Patrick Luyten, Peter Fonagy, Golan Shahar
BACKGROUND: Studies have consistently demonstrated the negative impact of childhood sexual abuse (CSA) on intimate relationships. The majority of studies have focused on revictimization in at-risk or clinical samples, with very few addressing the impact of CSA on otherwise well-functioning adults and even fewer investigating the psychological mechanisms involved. To fill this gap, this study focuses on the effect of CSA on "normative" (nonviolent) romantic relationships in otherwise well-functioning young women, and the mediating role of personality dimension self-criticism and attachment in this regard...
April 27, 2017: Psychological Trauma: Theory, Research, Practice and Policy
https://www.readbyqxmd.com/read/28434823/influence-of-serum-and-polystyrene-plate-type-on-stability-of-candida-albicans-biofilms
#12
Purity N Kipanga, Walter Luyten
Adhesion is a crucial initial step in microbial biofilm formation. Firm attachment to a target surface subsequently ensures successful colonization and survival despite turbulent conditions. In the laboratory, polystyrene plates are commonly used in biofilm experiments and the 'washing/rinse steps' before staining are critical for assaying biofilm viability. However, these rinse steps risk the removal (partially or entirely) of the formed biofilm, resulting in inconsistent results. The aim of the present study was to optimize conditions for firmer biofilms, less prone to disruption and thus significantly reducing well-to-well variability...
April 21, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28417664/low-dose-systemic-scopolamine-disrupts-context-conditioning-in-rats
#13
Laura Luyten, Shauni Nuyts, Tom Beckers
Cholinergic neurotransmission plays a key role in learning and memory. Prior research with rats indicated that a low dose of pre-training scopolamine (0.1 mg/kg), a cholinergic receptor antagonist, did not affect cued fear conditioning, but did block renewal when injected before extinguishing a conditioned tone, opening up opportunities to pharmacologically improve exposure therapy for anxiety patients. Before translating these findings to the clinic, it is important to carefully examine how scopolamine affects contextual fear memories...
June 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28413687/what-we-have-changed-our-minds-about-part-1-borderline-personality-disorder-as-a-limitation-of-resilience
#14
REVIEW
Peter Fonagy, Patrick Luyten, Elizabeth Allison, Chloe Campbell
This paper sets out a recent transition in our thinking in relation to psychopathology associated with personality disorder, in an approach that integrates our thinking about attachment, mentalizing (understanding ourselves and others in terms of intentional mental states) and epistemic trust (openness to the reception of social communication that is personally relevant and of generalizable significance) with recent findings on the structure of both adult and child psychopathology and resilience. In this paper - the first of two parts - we review evidence suggesting that a general psychopathology or p factor underlies vulnerability for psychopathology...
2017: Borderline Personality Disorder and Emotion Dysregulation
https://www.readbyqxmd.com/read/28405338/what-we-have-changed-our-minds-about-part-2-borderline-personality-disorder-epistemic-trust-and-the-developmental-significance-of-social-communication
#15
REVIEW
Peter Fonagy, Patrick Luyten, Elizabeth Allison, Chloe Campbell
In Part 1 of this paper, we discussed emerging evidence suggesting that a general psychopathology or 'p' factor underlying the various forms of psychopathology should be conceptualized in terms of the absence of resilience, that is, the absence of positive reappraisal mechanisms when faced with adversity. These impairments in the capacity for positive reappraisal seem to provide a comprehensive explanation for the association between the p factor and comorbidity, future caseness, and the 'hard-to-reach' character of many patients with severe personality pathology, most notably borderline personality disorder (BPD)...
2017: Borderline Personality Disorder and Emotion Dysregulation
https://www.readbyqxmd.com/read/28400312/assigning-clinical-codes-with-data-driven-concept-representation-on-dutch-clinical-free-text
#16
Elyne Scheurwegs, Kim Luyckx, Léon Luyten, Bart Goethals, Walter Daelemans
Clinical codes are used for public reporting purposes, are fundamental to determining public financing for hospitals, and form the basis for reimbursement claims to insurance providers. They are assigned to a patient stay to reflect the diagnosis and performed procedures during that stay. This paper aims to enrich algorithms for automated clinical coding by taking a data-driven approach and by using unsupervised and semi-supervised techniques for the extraction of multi-word expressions that convey a generalisable medical meaning (referred to as concepts)...
April 8, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28393091/data-on-cytotoxicity-in-hela-and-su-dhl-4-cells-exposed-to-dpb162-ae-compound
#17
Mart Bittremieux, Katsuhiko Mikoshiba, Geert Bultynck
DPB162-AE is a valuable tool to study store-operated Ca(2+) entry (SOCE), as this compound was developed as a 2-APB analog that inhibits SOCE more potently and more selectively than 2-APB itself. In addition to this, we showed that, in some conditions, DPB162-AE can deplete the endoplasmic reticulum Ca(2+) stores in intact cells, including the cervical carcinoma HeLa cell line and the diffuse large B-cell lymphoma SU-DHL-4 cell line. Here, we present data regarding the toxicity of DPB162-AE in HeLa and SU-DHL-4 cells...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28391358/genetic-evolution-of-uveal-melanoma-guides-the-development-of-an-inflammatory-microenvironment
#18
Gülçin Gezgin, Mehmet Dogrusöz, T Huibertus van Essen, Wilhelmina G M Kroes, Gregorius P M Luyten, Pieter A van der Velden, Vonn Walter, Robert M Verdijk, Thorbald van Hall, Sjoerd H van der Burg, Martine J Jager
Uveal melanoma (UM) is characterized by a number of genetic aberrations that follow a certain chronology and are tightly linked to tumor recurrence and survival. Loss of chromosome 3, bi-allelic loss of BAP1 expression, and gain in chromosome 8q have been associated with metastasis formation and death, while loss of chromosome 3 has been associated with the influx of macrophages and T cells. We used a set of genetically-classified UM to study immune infiltration in the context of their genetic evolution. We show in two independent cohorts that lack of BAP1 expression is associated with an increased density of CD3(+) T cells and CD8(+) T cells...
April 8, 2017: Cancer Immunology, Immunotherapy: CII
https://www.readbyqxmd.com/read/28338421/harnessing-the-osteogenicity-of-in-vitro-stem-cell-derived-mineralized-extracellular-matrix-as-3d-biotemplate-to-guide-bone-regeneration
#19
Yoke Chin Chai, Johanna Bolander, Ioannis Papantoniou, Jennifer Patterson, Jef Vleugels, Jan Schrooten, Frank P Luyten
Advanced biomaterials that are capable of guiding robust bone regeneration are highly demanded for translational therapy of bone defects or bone augmentation in clinics. One of the strategic approaches is to produce tissue engineering (TE) constructs that mediate bone regeneration by recapitulating the natural bone formation or healing process. In this study, we aimed at producing devitalized mineralized carriers with augmented bone forming capacity via a modified culture protocol (i.e., culture conditions with high calcium and/or phosphate concentrations) that first promotes cell growth and, subsequently, mineralized extracellular matrix (ECM) deposition by human periosteum-derived osteoprogenitor cells (hPDCs) on additive manufactured three-dimensional (3D) porous titanium (Ti)-based scaffolds...
March 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28294262/speciation-of-indium-iii-chloro-complexes-in-the-solvent-extraction-process-from-chloride-aqueous-solutions-to-ionic-liquids
#20
Clio Deferm, Bieke Onghena, Tom Vander Hoogerstraete, Dipanjan Banerjee, Jan Luyten, Harald Oosterhof, Jan Fransaer, Koen Binnemans
Most metal extraction studies focus on the kinetics, the maximum loading and the extraction equilibrium, while structural information on the extracted complexes has been limited. This paper concerns the nature of the indium(iii) chloride complexes, present in the organic and aqueous phase during the solvent extraction of indium(iii) from an aqueous HCl solution by undiluted ionic liquids Cyphos(®) IL 101 and Aliquat(®) 336. In an aqueous HCl solution (0-12 M), indium(iii) exists as octahedral mixed complexes, [In(H2O)6-nCln](3-n) (0 ≤ n ≤ 6)...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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