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Histochemistry and Cell Biology

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https://www.readbyqxmd.com/read/28321501/visualization-of-tumor-heterogeneity-by-in-situ-padlock-probe-technology-in-colorectal-cancer
#1
Amin El-Heliebi, Karl Kashofer, Julia Fuchs, Stephan W Jahn, Christian Viertler, Andrija Matak, Peter Sedlmayr, Gerald Hoefler
Tumor heterogeneity is considered a major cause for therapy resistance in colorectal cancer. Sub-populations of cells with different genetic alterations may exist in spatially distinct areas. Upon therapy, resistant sub-clones may enrich and ultimately lead to disease progression. Although ample data are available on tumors which are heterogeneous on a morphological level, only little is known about morphologically homogeneous tumors. We aimed to investigate if morphologically homogeneous colorectal cancer can harbor a heterogeneous genetic landscape...
March 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28321500/aptahistochemistry-in-diagnostic-pathology-technical-scrutiny-and-feasibility
#2
REVIEW
Bakhtiar A Bukari, Marimuthu Citartan, Ewe Seng Ch'ng, Mawethu P Bilibana, Timofey Rozhdestvensky, Thean-Hock Tang
Antibodies have been the workhorse for diagnostic immunohistochemistry to specifically interrogate the expression of certain protein to aid in histopathological diagnosis. This review introduces another dimension of histochemistry that employs aptamers as the core tool, the so-called aptahistochemistry. Aptamers are an emerging class of molecular recognition elements that could recapitulate the roles of antibodies. The many advantageous properties of aptamers suited for this diagnostic platform are scrutinized...
March 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28315934/gas1-expression-in-parietal-cells-of-bowman-s-capsule-in-experimental-diabetic-nephropathy
#3
Brenda I Luna-Antonio, Rafael Rodriguez-Muñoz, Carmen Namorado-Tonix, Paula Vergara, Jose Segovia, Jose L Reyes
Gas1 (Growth Arrest-Specific 1) is a pleiotropic protein with novel functions including anti-proliferative and proapoptotic activities. In the kidney, the expression of Gas1 has been described in mesangial cells. In this study, we described that renal parietal cells of Bowman's capsule (BC) and the distal nephron cells also express Gas1. The role of Gas1 in the kidney is not yet known. There is a subpopulation of progenitor cells in Bowman's capsule with self-renewal properties which can eventually differentiate into podocytes as a possible mechanism of regeneration in the early stages of diabetic nephropathy...
March 18, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28314909/localization-of-dynamin-related-protein-1-and-its-potential-role-in-lamellipodia-formation
#4
Youhwa Jo, Hyo Min Cho, Woong Sun, Jae Ryun Ryu
Dynamin-related protein1 (Drp1) plays an essential role in mitochondrial fission: Cytosolic Drp1 is translocated to the mitochondria upon stimulus, and oligomerized Drp1 constricts mitochondria by aid of actin filaments. Drp1 completes the fission process with GTP hydrolysis by its own GTPase activity. The importance of actin filament and its interaction with Drp1 in the mitochondrial fission process have been demonstrated. In this study, we found that Drp1 is enriched in the actin-rich leading edge of lamellipodia of mouse embryonic fibroblasts (MEFs) wherein mitochondria or peroxisomes are absent...
March 17, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28293722/pattern-of-cardiotoxin-induced-muscle-remodeling-in-distinct-tlr-4-deficient-mouse-strains
#5
Eustáquio Luiz Paiva-Oliveira, Rafael Ferreira da Silva, Maria Bellio, Thereza Quirico-Santos, Jussara Lagrota-Candido
Tissue damage triggers innate immune response mediated by Toll-like receptor 4 (TLR) that recognizes endogenous host danger molecules associated with cell death and tissue inflammation, although the precise role of TLR-4 signaling in muscle tissue repair is still uncertain. Previously, we observed that TLR-4 exerted a protective effect preventing excessive muscular damage induced by Bothrops jararacussu crude venom. This study aimed to evaluate the involvement of TLR-4 at early stages of muscular tissue remodeling in distinct mouse strains after injection of purified snake venom...
March 14, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28285337/section-detachment-in-immunohistochemistry-causes-troubleshooting-and-problem-solving
#6
Alessandro Gambella, Lucia Porro, Simona Pigozzi, Roberto Fiocca, Federica Grillo, Luca Mastracci
Section detachment in immunohistochemistry (IHC) is a common phenomenon, increasing times and costs of diagnosis and research. However, it has poorly been investigated. The aim of this study was to identify the causes of section detachment, with the purpose of defining a quality assured laboratory procedure to minimize detachment frequency. We screened 3349 IHC sections from formalin-fixed paraffin-embedded tissue, identifying 177 cases with section detachment (5.3% of the sample). Detachment regarded mainly samples of surgical breast tissue and IHC procedures in which heat pretreatment was used...
March 11, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28285336/in-focus-in-hcb
#7
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
March 11, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28283744/serial-block-face-scanning-electron-microscopy-applied-to-study-the-trafficking-of-8d3-coated-gold-nanoparticles-at-the-blood-brain-barrier
#8
Itsaso Cabezón, Elisabet Augé, Manel Bosch, Alison J Beckett, Ian A Prior, Carme Pelegrí, Jordi Vilaplana
Due to the physical and physiological properties of the blood-brain barrier (BBB), the transport of neurotherapeutics from blood to brain is still a pharmaceutical challenge. We previously conducted a series of experiments to explore the potential of the anti-transferrin receptor 8D3 monoclonal antibody (mAb) to transport neurotherapeutics across the BBB. In that study, gold nanoparticles (AuNPs) were coated with the 8D3 antibody and administered intravenously to mice. Transmission electron microscopy was used and a two-dimensional (2D) image analysis was performed to detect the AuNPs in the brain capillary endothelial cells (BCECs) and brain parenchyma...
March 10, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28265783/t84-monolayers-are-superior-to-caco-2-as-a-model-system-of-colonocytes
#9
Sarah Devriese, Lien Van den Bossche, Sophie Van Welden, Tom Holvoet, Iris Pinheiro, Pieter Hindryckx, Martine De Vos, Debby Laukens
Colonic adenocarcinoma-derived Caco-2 and T84 epithelial cell lines are frequently used as in vitro model systems of functional epithelial barriers. Both are utilised interchangeably despite evidence that differentiated Caco-2 cells are more reminiscent of small intestinal enterocytes than of colonocytes, whereas differentiated T84 cells are less well characterised. The aim of this study was, therefore, to further characterise and compare differentiated Caco-2 and T84 cells. The objectives were to (1) compare the brush border morphology, (2) measure the expression of enterocyte- and colonocyte-specific genes and (3) compare their response to butyrate, which is dependent on the monocarboxylate transporter 1 (MCT1), an apical protein expressed primarily in colonocytes...
March 6, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28258388/smad7-deficiency-stimulates-m%C3%A3-ller-progenitor-cell-proliferation-during-the-development-of-the-mammalian-retina
#10
Martina Kugler, Anja Schlecht, Rudolf Fuchshofer, Sabrina I Schmitt, Ingo Kleiter, Ludwig Aigner, Ernst R Tamm, Barbara M Braunger
The transforming growth factor-β (TGF-β) pathway contributes to maintain the quiescence of adult neural stem and progenitor cells in the brain. In the retina, Müller cells are discussed to represent a glial cell population with progenitor-like characteristics. Here, we aimed to investigate if elevated TGF-β signaling modulates the proliferation of Müller cells during retinal development. We generated mutant mice with a systemic, heterozygous up-regulation of TGF-β signaling by deleting its inhibitor SMAD7...
March 3, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28247029/in-focus-in-hcb
#11
EDITORIAL
Douglas J Taatjes, Jürgen Roth
No abstract text is available yet for this article.
March 1, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28247028/localization-and-pneumococcal-alteration-of-junction-proteins-in-the-human-alveolar-capillary-compartment
#12
Andrea Peter, Diana Fatykhova, Olivia Kershaw, Achim D Gruber, Jens Rueckert, Jens Neudecker, Mario Toennies, Torsten T Bauer, Paul Schneider, Maria Schimek, Stephan Eggeling, Norbert Suttorp, Andreas C Hocke, Stefan Hippenstiel
Loss of alveolar barrier function with subsequent respiratory failure is a hallmark of severe pneumonia. Although junctions between endo- and epithelial cells regulate paracellular fluid flux, little is known about their composition and regulation in the human alveolar compartment. High autofluorescence of human lung tissue in particular complicates the determination of subcellular protein localization. By comparing conventional channel mode confocal imaging with spectral imaging and linear unmixing, we demonstrate that background fluorescent spectra and fluorophore signals could be rigorously separated resulting in complete recovery of the specific signal at a high signal-to-noise ratio...
March 1, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28243739/characterization-of-mast-cell-populations-using-different-methods-for-their-identification
#13
Dmitri Atiakshin, Vera Samoilova, Igor Buchwalow, Werner Boecker, Markus Tiemann
Mast cells are ubiquitous throughout the human tissues and play an essential role in physiology and pathology. For evaluation of patients with pathological conditions, mast cells were primarily detected using metachromatic staining with toluidine blue. In the last decades, the staining arsenal of pathologists was enriched with enzyme histochemical and immunohistochemical methods, and it was established that depending on species and tissue localization mast cells are not similar both in appearance and function...
February 27, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28235998/the-epigenetic-modifications-and-the-anterior-to-posterior-characterization-of-meiotic-entry-during-mouse-oogenesis
#14
Xia-Fei Fu, Fan Yang, Shun-Feng Cheng, Yan-Ni Feng, Lan Li, Paul W Dyce, Wei Shen, Xiao-Feng Sun
The meiotic initiation of mammalian oogonia is a critical step during the development of primordial germ cells (PGCs) to mature oocytes. In this study, a systematic investigation of epigenetic modifications and DAZL gene expression during oogonia meiotic entry were performed. We found that the expression of DAZL was epigenetically regulated by DNA methylation of CpG islands within its promoter region. During meiotic entry, a continuously increasing level of 5hmC, a stable epigenetic marker usually associated with the activation of gene expression, was observed from 11...
February 24, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28220245/phosphorylation-of-histone-h3-on-ser-10-by-aurora-b-is-essential-for-chromosome-condensation-in-porcine-embryos-during-the-first-mitotic-division
#15
Changchao Chen, Zixiao Zhang, Panpan Cui, Yaya Liao, Yue Zhang, Lingyun Yao, Rong Rui, Shiqiang Ju
Phosphorylation of histone H3 on Ser-10 (H3S10ph) is involved in regulating mitotic chromosome condensation and decondensation, which plays an important regulatory role during mitotic cell cycle progression in mammalian cells. However, whether H3S10ph plays a similar role in early porcine embryos during the first mitotic division remains uncertain. In this study, the subcellular localization and possible roles of H3S10ph were evaluated in the first mitotic cell cycle progression of porcine embryos using western blot, indirect immunofluorescence and barasertib (H3S10ph upstream regulator Aurora-B inhibitor) treatments...
February 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28220244/resetting-of-renal-tissular-renin-angiotensin-and-bradykinin-kallikrein-systems-after-unilateral-kidney-denervation-in-rats
#16
Jürgen M Bohlender, Jürg Nussberger, Frédéric Birkhäuser, Eric Grouzmann, George N Thalmann, Hans Imboden
The renal tissular renin-angiotensin and bradykinin-kallikrein systems control kidney function together with the renal sympathetic innervation but their interaction is still unclear. To further elucidate this relationship, we investigated these systems in rats 6 days after left kidney denervation (DNX, n = 8) compared to sham-operated controls (CTR, n = 8). Plasma renin concentration was unchanged in DNX vs. CTR (p = NS). Kidney bradykinin (BK) and angiotensin (Ang) I and II concentrations decreased bilaterally in DNX vs...
February 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28191619/hypothyroidism-reduces-mammary-tumor-progression-via-%C3%AE-catenin-activated-intrinsic-apoptotic-pathway-in-rats
#17
C M López Fontana, L E Zyla, F E Santiano, C V Sasso, F D Cuello-Carrión, V Pistone Creydt, M A Fanelli, R W Carón
Experimental hypothyroidism retards mammary carcinogenesis promoting apoptosis of tumor cells. β-catenin plays a critical role in cell adhesion and intracellular signaling pathways conditioning the prognosis of breast cancer. However, the mechanistic connections associated with the expression of β-catenin in thyroid status and breast cancer are not known. Therefore, we studied the relationship between the expression and localization of β-catenin and apoptosis in mammary tumors induced by 7,12-dimethylbenz(a)anthracene (DMBA) in hypothyroid (Hypot) and euthyroid (EUT) rats...
February 13, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28185006/hair-follicle-stem-cell-proliferation-akt-and-wnt-signaling-activation-in-tpa-induced-hair-regeneration
#18
Weiming Qiu, Mingxing Lei, Ling Zhou, Xiufeng Bai, Xiangdong Lai, Yu Yu, Tian Yang, Xiaohua Lian
Regeneration of hair follicles relies on activation of hair follicle stem cells during telogen to anagen transition process in hair cycle. This process is rigorously controlled by intrinsic and environmental factors. 12-o-tetradecanoylphorbol-13-acetate (TPA), a tumor promoter, accelerates reentry of hair follicles into anagen phase. However, it is unclear that how TPA promotes the hair regeneration. In the present study, we topically applied TPA onto the dorsal skin of 2-month-old C57BL/6 female mice to examine the activity of hair follicle stem cells and alteration of signaling pathways during hair regeneration...
February 9, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28168650/gsdma3-is-required-for-mammary-gland-development-in-mice
#19
Haiying Guo, Senlin Xu, Yingxin Liu, Yang Yang, Fang Deng, Yizhan Xing, Xiaohua Lian, Yuhong Li
AE (alopecia and excoriation) is a mouse mutant phenotype that harbours a mutation in Gsdma3. Gsdma3 has been reported to regulate the development of skin and hair follicles. However, its role in the mammary glands has not been reported. In this study, we found that descendants bred from an AE mother died within 12 days after birth. Then, we found that the expression of Gsdma3 varied among the developmental stages of mammary glands. Subsequently, we systematically studied the phenotype of the mammary glands of AE and wild-type mice, revealing that the mammary glands were smaller in AE mice...
February 6, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28168649/combined-orcein-and-martius-scarlet-blue-omsb-staining-for-qualitative-and-quantitative-analyses-of-atherosclerotic-plaques-in-brachiocephalic-arteries-in-apoe-ldlr-mice
#20
Mariusz Gajda, Agnieszka Jasztal, Tomasz Banasik, Ewa Jasek-Gajda, Stefan Chlopicki
Numerous cellular and extracellular components should be analyzed in sections of atherosclerotic plaques to assess atherosclerosis progression and vulnerability. Here, we combined orcein (O) staining for elastic fibers and martius scarlet blue (MSB) polychrome to visualize various morphological contents of plaque in brachiocephalic arteries (BCA) of apoE/LDLR(-/-) mice. Elastic fibers (including broken elastic laminae and 'buried' fibrous caps) were stained purple and they could be easily distinguished from collagen fibers (blue)...
February 6, 2017: Histochemistry and Cell Biology
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