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Tissue Tracking

Kate E Smith, Martin M Shafer, Debora Weiss, Henry A Anderson, Patrick R Gorski
Exposure to the neurotoxic element lead (Pb) continues to be a major human health concern, particularly for children in US urban settings, and the need for robust tools for assessment of exposure sources has never been greater. The latest generation of multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) instrumentation offers the capability of using Pb isotopic signatures as a tool for environmental source tracking in public health. We present a case where MC-ICPMS was applied to isotopically resolve Pb sources in human clinical samples...
October 19, 2016: Biological Trace Element Research
Shawn P Reese, Niloofar Farhang, Randy Poulson, Gennie Parkman, Jeffrey A Weiss
In vitro polymerized type I collagen hydrogels have been used extensively as a model system for three-dimensional (3D) cell and tissue culture, studies of fibrillogenesis, and investigation of multiscale force transmission within connective tissues. The nanoscale organization of collagen fibrils plays an essential role in the mechanics of these gels and emergent cellular behavior in culture, yet quantifying 3D structure with nanoscale resolution to fully characterize fibril organization remains a significant technical challenge...
October 18, 2016: Biophysical Journal
Jacques Pécréaux, Stefanie Redemann, Zahraa Alayan, Benjamin Mercat, Sylvain Pastezeur, Carlos Garzon-Coral, Anthony A Hyman, Jonathon Howard
Precise positioning of the mitotic spindle is important for specifying the plane of cell division, which in turn determines how the cytoplasmic contents of the mother cell are partitioned into the daughter cells, and how the daughters are positioned within the tissue. During metaphase in the early Caenorhabditis elegans embryo, the spindle is aligned and centered on the anterior-posterior axis by a microtubule-dependent machinery that exerts restoring forces when the spindle is displaced from the center. To investigate the accuracy and stability of centering, we tracked the position and orientation of the mitotic spindle during the first cell division with high temporal and spatial resolution...
October 18, 2016: Biophysical Journal
Peter Kruzliak, Alexander Berezin, Alexander Kremzer, Tatyana Samura, Roman Benacka, Ioana Mozos, Emmanuel Egom, Luis Rodrigo
BACKGROUND: Biomechanical stress and inflammatory biomarkers relate to global contractility dysfunction; however, adding these biomarkers into a risk model constructed on clinical data does not improve its prediction value in chronic heart failure (CHF). AIM: The aim of this study was to evaluate whether biomarkers predict declining of left ventricular global contractility function in diabetic patients with ischemia-induced CHF. PATIENTS AND METHODS: The study retrospectively evolved 54 diabetic patients who had systolic or diastolic ischemia-induced CHF that was defined as left-ventricular ejection fraction (LVEF) ≤45% or 46-55% respectively assessed by quantitative echocardiography and other conventional criteria according to current clinical guidelines...
September 1, 2016: Folia Medica
Hannah B Vander Zanden, Alan B Bolten, Anton D Tucker, Kristen M Hart, Margaret M Lamont, Ikuko Fujisaki, Kimberly J Reich, David S Addison, Katherine L Mansfield, Katrina F Phillips, Mariela Pajuelo, Karen A Bjorndal
Assessments of large-scale disasters, such as the Deepwater Horizon oil spill, are problematic because while measurements of post-disturbance conditions are common, measurements of pre-disturbance baselines are only rarely available. Without adequate observations of pre-disaster organismal and environmental conditions, it is impossible to assess the impact of such catastrophes on animal populations and ecological communities. Here, we use long-term biological tissue records to provide pre-disaster data for a vulnerable marine organism...
October 2016: Ecological Applications: a Publication of the Ecological Society of America
Debasish Sen, Stephen M Jones, Erin M Oswald, Henry Pinkard, Kaitlin Corbin, Matthew F Krummel
Myeloid-derived cells such as monocytes, dendritic cells (DCs), and macrophages are at the heart of the immune effector function in an inflammatory response. But because of the lack of an efficient imaging system to trace these cells live during their migration and maturation in their native environment at sub-cellular resolution, our knowledge is limited to data available from specific time-points analyzed by flow cytometry, histology, genomics and other immunological methods. Here, we have developed a ratiometric imaging method for measuring monocyte maturation in inflamed mouse lungs in situ using real-time using 2-photon imaging and complementary methods...
2016: PloS One
Utku Kandemir, Safa Herfat, Mary Herzog, Paul Viscogliosi, Murat Pekmezci
OBJECTIVES: The goal of this study is to compare the fatigue strength of a locking intramedullary nail (LN) construct to a double locking plate (DLP) construct in comminuted proximal extra-articular tibia fractures. METHODS: Eight pairs of fresh frozen cadaveric tibias with low bone mineral density (Age: 80 ± 7 (SD) years, T-score: -2.3 ± 1.2) were used. One tibia from each pair was fixed with LN while the contralateral side was fixed with DLP for complex extra-articular multifragmentary, metaphyseal fractures (simulating OTA41-A3...
October 7, 2016: Journal of Orthopaedic Trauma
Enrico Agabiti Rosei
Current Hypertension Guidelines emphasize the importance of assessing the presence of preclinical organ damage. In fact, an extensive evaluation of organ damage may increase the number of patients classified at high CV risk and therefore strongly influence the clinical management of patients. Hypertensive heart disease remains to date the form of organ damage for which there is the greatest amount of evidence of a strong independent prognostic significance. In the presence of a chronic pressure overload, a parallel addition of sarcomers takes place with an increase in myocyte width, which in turn increases left ventricular wall thickness; myocyte hypertrophy is also associated with apoptosis, collagen deposition and ventricular fibrosis with an impairment of coronary hemodynamics as well, thus profoundly influencing functional properties of the left (and right) ventricle...
September 2016: Journal of Hypertension
Chang Wei-Ting, Chen Zhih-Cherng, Cheng Juei-Tang
OBJECTIVE: Despite the threatening risks of diabetes-induced cardiac fibrosis, less is known to whether diabetes causes an altered cardiac phenotype independent of coronary atherosclerosis. Peroxisome proliferator-activated receptor δ (PPARδ) emerges as a versatile regulator of metabolic and inflammatory homeostasis. Potentially PPARδ may be a therapeutic target for diabetes induced cardiac fibrosis. In the present study, we investigated the effectiveness of Telmisartan, a unique angiotensin receptor blocker (ARB) that increased the expression of PPARδ, in the improvement of left ventricular remodeling in both diabetic human and rats...
September 2016: Journal of Hypertension
Somia H Abd Allah, Sally M Shalaby, Amal S El-Shal, Sameh M El Nabtety, Tarek Khamis, Shimaa A Abd El Rhman, Mahmoud A Ghareb, Hesham M Kelani
Exciting advances are revealing that breast milk harbors populations of stem and progenitor cells, and much attention is now intensified on delineating their properties and functions. The aim of this study is to isolate a mesenchymal stem cell (MSC)-like population from rabbit breast milk and track their integration into the different organs of the breastfed rabbits after taken by oral route and to explore the functional role of stem cells in the breastfed newborn babies. Ten newborn rabbits 2 weeks old fed on 2 × 10(6) PKH26-labeled rabbit milk derived-MSCs suspended in 2 mL Dulbecco's modified Eagle's medium (DMEM) and 10 newborn baby rabbits fed with 2 mL DMEM solution or with rabbit fibroblasts as a control group were used in the study...
October 17, 2016: IUBMB Life
Ornella Affinito, Giovanni Scala, Domenico Palumbo, Ermanno Florio, Antonella Monticelli, Gennaro Miele, Vittorio Enrico Avvedimento, Alessandro Usiello, Lorenzo Chiariotti, Sergio Cocozza
DNA methylation is often analyzed by reporting the average methylation degree of each cytosine. In this study, we used a single molecule methylation analysis in order to look at the methylation conformation of individual molecules. Using D-aspartate oxidase as a model gene, we performed an in-depth methylation analysis through the developmental stages of three different mouse tissues (brain, lung, and gut), where this gene undergoes opposite methylation destiny. This approach allowed us to track both methylation and demethylation processes at high resolution...
October 17, 2016: Epigenetics: Official Journal of the DNA Methylation Society
Raf Donders, Kathleen Sanen, Rik Paesen, Eli Slenders, Wilfried Gyselaers, Piet Stinissen, Marcel Ameloot, Niels Hellings
In situ detection of MSCs remains difficult and warrants additional methods to aid with their characterization in vivo. Two-photon confocal laser scanning microscopy (TPM) and second harmonic generation (SHG) could fill this gap. Both techniques enable the detection of cells and extracellular structures, based on intrinsic properties of the specific tissue and intracellular molecules under optical irradiation. TPM imaging and SHG imaging have been used for label-free monitoring of stem cells differentiation, assessment of their behavior in biocompatible scaffolds, and even cell tracking in vivo...
2016: Stem Cells International
Vinayak S Gowda, Dhruv Anand, Manoj Kumar Sundar, Agnelo Michael Reveredo, Shilpa Shetty
Dental implants with their increasing success rates and predictability of final outcome are fast becoming the treatment of choice for replacing missing teeth. Considering the success of immediate implant placement in reducing tissue loss and achieving good esthetic results, is making it a more popular treatment modality in implant dentistry. Understanding the management of gingival tissues in relation to implants to obtain maximum esthetics is of utmost importance. The use of provisional abutments and immediate temporization has a proven track record of their ability to produce optimal esthetics and to guide the tissue response during the healing phase...
October 2016: Journal of Indian Prosthodontic Society
Ravi Theja V Chintapalli, Julián F Hillyer
The wings of insects are composed of membranes supported by interconnected veins. Within these veins are epithelial cells, nerves and tracheae, and their maintenance requires the flow of hemolymph. For this purpose, insects employ accessory pulsatile organs (auxiliary hearts) that circulate hemolymph throughout the wings. Here, we used correlative approaches to determine the functional mechanics of hemolymph circulation in the wings of the malaria mosquito, Anopheles gambiae Examination of sectioned tissues and intravital videos showed that the wing heart is located underneath the scutellum and is separate from the dorsal vessel...
October 14, 2016: Journal of Experimental Biology
Malek Kammoun, Philippe Pouletaut, Francis Canon, Malayannan Subramaniam, John R Hawse, Muriel Vayssade, Sabine F Bensamoun
As transforming growth factor (TGF)-β inducible early gene-1 is highly expressed in skeletal muscle, the effect of TIEG1 gene deletion on the passive mechanical properties of slow and fast twitch muscle fibers was analyzed. Twenty five muscle fibers were harvested from soleus (Sol) and extensor digitorum longus (EDL) muscles from TIEG1-/- (N = 5) and control (N = 5) mice. Mechanical tests were performed on fibers and the dynamic and static stresses were measured. A viscoelastic Hill model of 3rd order was used to fit the experimental relaxation test data...
2016: PloS One
Zhi Su, Deborah Widomski, Ji Ma, Marian Namovic, Arthur Nikkel, Laura Leys, Lauren Olson, Katherine Salte, Diana Donnelly-Roberts, Timothy Esbenshade, Steve McGaraughty
BACKGROUND: Obese ZSF-1 rats display many features of human type II diabetes including nephropathy (DN). The study aimed to further understand the relevance of this model to DN, for which glomerular filtration rate (GFR), renal fibrosis and several urinary/tissue biomarkers was followed over 24 weeks in ZSF-1 rats. METHODS: Intact/sham or uninephrectomized male and female ZSF-1 rats were studied. GFR was measured by transdermal clearance of fluorescein isothiocyanate-sinistrin...
October 14, 2016: American Journal of Nephrology
Leah J Greenspan, Erika L Matunis
Live imaging of adult tissue stem cell niches provides key insights into the dynamic behavior of stem cells, their differentiating progeny, and their neighboring support cells, but few niches are amenable to this approach. Here we discuss a technique for long-term live imaging of the Drosophila testis stem cell niche. Culturing whole testes ex vivo for up to 12.5 h allows for tracking of cell-type specific behaviors under normal and various chemically or genetically modified conditions. Fixing and staining tissues after live imaging allows for the molecular confirmation of cell identity and behavior...
2017: Methods in Molecular Biology
Changwon Kang, Yejin Lee, J Eugene Lee
The last decade has witnessed remarkable technological advances in mass spectrometry-based proteomics. The development of proteomics techniques has enabled the reliable analysis of complex proteomes, leading to the identification and quantification of thousands of proteins in gastric cancer cells, tissues, and sera. This quantitative information has been used to profile the anomalies in gastric cancer and provide insights into the pathogenic mechanism of the disease. In this review, we mainly focus on the advances in mass spectrometry and quantitative proteomics that were achieved in the last five years and how these up-and-coming technologies are employed to track biochemical changes in gastric cancer cells...
October 7, 2016: World Journal of Gastroenterology: WJG
Flemming Javier Olsen, Litten Bertelsen, Martina Chantal de Knegt, Thomas Emil Christensen, Niels Vejlstrup, Jesper Hastrup Svendsen, Jan Skov Jensen, Tor Biering-Sørensen
Several cardiac imaging modalities are able to visualize the left atrium (LA) and, therefore, allow for quantification of both structural and functional properties of this cardiac chamber. In echocardiography, only the maximal LA volume is included in the assessment of diastolic function at the current moment. Numerous studies, however, have shown that functional measures may be superior to the maximal LA volume in several aspects and to possess clinical value even in the absence of structural abnormalities...
October 2016: Circulation. Cardiovascular Imaging
Daniel Dziob, Tomasz Kołodziej, Justyna Nowak, Piotr Cyzio, Joanna Raczkowska, Jadwiga Laska, Zenon Rajfur
Cell migration is an important biological phenomenon which depends on a number of internal and external factors. One of such factors can be the mechanical properties of the environment which can have an impact on the cell's regulatory pathways through so-called mechanotransduction. Ultimately, these properties can also influence the process of cell migration. The goal of this work is to investigate how substrate stiffness (elasticity) changes basic migration parameters of migrating cells. Fish keratocytes migrating on polyacrylamide hydrogels have been used as a model of fast migrating cells...
October 11, 2016: Physical Biology
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