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Acta Histochemica et Cytochemica

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https://www.readbyqxmd.com/read/30279614/intranuclear-mobility-of-estrogen-receptor-implication-for-transcriptional-regulation
#1
Ken Ichi Matsuda, Takashi Hashimoto, Mitsuhiro Kawata
The estrogen receptor (ER) is a ligand-dependent transcription factor that has two subtypes: ERα and ERβ. ERs regulate transcription of estrogen-responsive genes through interactions with multiple intranuclear components, such as cofactors and the nuclear matrix. Live cell imaging using fluorescent protein-labeled ERs has revealed that ligand-activated ERs are highly mobile in the nucleus, with transient association with the DNA and nuclear matrix. Scaffold attachment factor B (SAFB) 1 and its paralogue, SAFB2, are nuclear matrix-binding proteins that negatively modulate ERα-mediated transcription...
August 29, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/30083020/biochemical-and-morphological-characterization-of-a-guanine-nucleotide-exchange-factor-arhgef9-in-mouse-tissues
#2
Kyoko Ibaraki, Makoto Mizuno, Hitomi Aoki, Ayumi Niwa, Ikuko Iwamoto, Akira Hara, Hidenori Tabata, Hidenori Ito, Koh-Ichi Nagata
ARHGEF9, also known as Collybistin, a guanine nucleotide exchange factor for Rho family GTPases, is thought to play an essential role in the mammalian brain. In this study, we prepared a specific polyclonal antibody against ARHGEF9, anti-ARHGEF9, and carried out expression analyses with mouse tissues especially brain. Western blotting analyses demonstrated tissue-dependent expression profiles of ARHGEF9 in the young adult mouse, and strongly suggested a role during brain development. Immunohistochemical analyses revealed developmental stage-dependent expression profiles of ARHGEF9 in cerebral cortex, hippocampus and cerebellum...
June 26, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/30083019/trk-fused-gene-protein-localization-is-prominent-in-serotonergic-and-noradrenergic-cell-groups-and-some-lower-motor-neurons-in-the-corticospinal-tract-of-the-rat-brainstem
#3
Shigeko Takeuchi, Ikuo Tooyama
The TRK-fused gene ( TFG ) is reported to be involved in the regulation of cell size, apoptosis, cell growth, ER-Golgi protein secretion, NF-κβ pathway signaling, the ubiquitin-proteasome system, and pancreatic β-cell mass and function. TFG mutations were reported in some neurodegenerative diseases affecting sensory and motor functions. However, the function of TFG in the nervous system and how TFG mutations lead to neurodegeneration remain unclear. In this study, we employed double immunohistochemistry to investigate the details of TFG localization patterns in monoaminergic and cholinergic neurons in the brainstem...
June 26, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/30083018/label-free-molecular-imaging-and-analysis-by-raman-spectroscopy
#4
Yasuaki Kumamoto, Yoshinori Harada, Tetsuro Takamatsu, Hideo Tanaka
Raman scattering of a cell conveys the intrinsic information inherent to chemical structures of biomolecules. The spectroscopy of Raman scattering, or Raman spectroscopy, allows label-free and quantitative molecular sensing of a biological sample in situ without disruption. For the last five decades Raman spectroscopy has been widely utilized in biological research fields. However, it is just within the latest decade that molecular imaging and discrimination of living cells and tissues have become practically available...
June 26, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29867282/changes-in-dna-methylation-of-oocytes-and-granulosa-cells-assessed-by-helmet-during-folliculogenesis-in-mouse-ovary
#5
Jin Liu, Wenchang Zhang, Zhiren Wu, Lei Dai, Takehiko Koji
For a better understanding of epigenetic regulation of cell differentiation, it is important to analyze DNA methylation at a specific site. In this study, we examined changes in the methylation level of CCGG and GATCG sites during mouse folliculogenesis in paraffin-embedded sections of mouse ovaries. For the purpose, we used a new method, histo endonuclease-linked detection of methylation sites of DNA (HELMET), designed to detect methylation sites of DNA with a specific sequence in a tissue section. Unlike the global level of DNA methylation, which was no change in immunohistochemical staining of 5-methylcytosine throughout folliculogenesis, we found that there were hypermethylation of CCGG and GATCG sites in most of the granulosa cells of tertiary follicles compared to that of primary and secondary follicles...
April 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29867281/morphological-analysis-of-trafficking-and-processing-of-anionic-and-cationic-liposomes-in-cultured-cells
#6
Yuji Tomori, Norio Iijima, Shuji Hinuma, Hirotaka Ishii, Ken Takumi, Shinro Takai, Hitoshi Ozawa
Liposomes, artificial phospholipid vesicles, have been developed as a non-viral drug delivery system to allow contained agents to be efficiently delivered to target sites via systemic circulation. Liposomes have been used as a gene transfer tool with cultured cells; however, their precise trafficking and processing remain uncertain. Furthermore, liposomes with different surface charges are known to exhibit distinct properties. The purpose of the current study was to elucidate the intracellular trafficking and processing of liposomes with anionic and cationic surface charges from a morphological view point...
April 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29867280/effect-of-daily-light-on-c-fos-expression-in-the-suprachiasmatic-nucleus-under-jet-lag-conditions
#7
Yulin Chen, Yoshiaki Yamaguchi, Toru Suzuki, Masao Doi, Hitoshi Okamura
Jet-lag symptoms arise from temporal misalignment between the internal circadian clock and external solar time when traveling across multiple time zones. Light is known as a strong timing cue of the circadian clock. We here examined the effect of daily light on the process of jet lag by detecting c-Fos expression in the master clock neurons in the suprachiasmatic nucleus (SCN) under 8-hr phase-advanced jet lag condition. In WT mice, c-Fos-immunoreactivity was found at 1-2 hours on the first day after light/dark (LD) phase-advance...
April 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29867279/electron-microscopic-study-using-formalin-fixed-paraffin-embedded-material-with-special-reference-to-observation-of-microbial-organisms-and-endocrine-granules
#8
Yutaka Tsutsumi
In the diagnostic pathology practice, specimens for electron microscopy (EM) are not necessarily handled and fixed under the ideal condition. In the present article, the author describes ultrastructural study using formalin-fixed and/or paraffin-embedded material. The fine morphologic preservation is often acceptable, particularly when small cubes are dug out of paraffin blocks. Particulate structures such as neuroendocrine granules and microbes are consistently observed even using paraffin sections. Paraffin sections signalized with silver particles in Grimelius and Grocott stains or diaminobenzidine products in immunostaining and in situ hybridization are applicable to EM evaluation by using a pre-embedding sequence...
April 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622850/expression-of-draxin-in-lung-carcinomas
#9
Younosuke Sato, Akira Matsuo, Shinji Kudoh, Liu Fang, Koki Hasegawa, Yohei Shinmyo, Takaaki Ito
Guidance molecules, such as Netrin-1, and their receptors have important roles in controlling axon pathfinding, modulate biological activities of various cancer cells, and may be a useful target for cancer therapy. Dorsal repulsive axon guidance protein (Draxin) is a novel guidance molecule that binds not only common guidance molecule receptors with Netrin-1, but also directly binds the EGF domain of Netrin-1 through a 22-amino-acid peptide (22aa). By immunostaining, Draxin was positively expressed in small cell carcinoma, adenocarcinoma (ADC), and squamous cell carcinoma of the lung...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622849/expression-and-dynamics-of-podoplanin-in-cultured-osteoblasts-with-mechanostress-and-mineralization-stimulus
#10
Tomohiro Takenawa, Takenori Kanai, Tetsuya Kitamura, Yoshitaka Yoshimura, Yoshihiko Sawa, Junichiro Iida
This study investigates the significance of the expression and dynamics of podoplanin in mechanostress and mineralization in cultured murine osteoblasts. Podoplanin increased in osteoblasts subjected to straining in non-mineralization medium, suggesting that the mechanostress alone is a podoplanin induction factor. In osteoblasts subjected to vertical elongation straining in the mineralization medium, the mRNA amounts of podoplanin, osteopontin, and osteocalcin were significantly larger than those in cells not subjected to straining, suggesting that mechanostress is the cause of a synergistic effect in the expression of these proteins...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622848/the-hdac-inhibitor-saha-prevents-colonic-inflammation-by-suppressing-pro-inflammatory-cytokines-and-chemokines-in-dss-induced-colitis
#11
Mohmand Noor Ali, Narantsog Choijookhuu, Hideaki Takagi, Naparee Srisowanna, Mai Nguyen Nhat Huynh, Yuya Yamaguchi, Phyu Synn Oo, Myat Tin Htwe Kyaw, Katsuaki Sato, Ryoji Yamaguchi, Yoshitaka Hishikawa
Inflammatory bowel disease (IBD) is an inflammatory disorder of the gastrointestinal tract that is caused by multiple factors, including dysfunction of the immune system and genetic and epigenetic alterations. Aberrant epigenetic regulation, especially histone acetylation, was found in biopsies from IBD patients and mouse models of colitis, suggesting that an epigenetic treatment approach may be useful for IBD therapy. Therefore, we investigated the effects of the histone deacetylase (HDAC) inhibitor, suberoylanilide hydroxamic acid (SAHA), in a mouse model of dextran sulfate sodium (DSS)-induced colitis...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622847/estrogen-regulates-mitochondrial-morphology-through-phosphorylation-of-dynamin-related-protein-1-in-mcf7-human-breast-cancer-cells
#12
Phyu Synn Oo, Yuya Yamaguchi, Akira Sawaguchi, Myat Tin Htwe Kyaw, Narantsog Choijookhuu, Mohmand Noor Ali, Naparee Srisowanna, Shin-Ichiro Hino, Yoshitaka Hishikawa
Estrogen affects mitochondrial function in various tissues, but the precise mechanism remains unclear. We, therefore investigated the effect on estrogen-regulated mitochondrial morphology by dynamin-related protein 1 (Drp1) and its Ser616-phosphorylated derivative (pDrp1Ser616 ) are involved in mitochondrial fission. MCF7 human breast cancer cells were treated with 17β-estradiol (E2 ), an estrogen receptor (ER) α and β antagonist (ICI 182, 780), an ERα antagonist (MPP), and an ERβ antagonist (PHTPP) for 24 hr...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622846/improved-serial-sectioning-techniques-for-correlative-light-electron-microscopy-mapping-of-human-langerhans-islets
#13
Sei Saitoh, Nobuhiko Ohno, Yurika Saitoh, Nobuo Terada, Satoshi Shimo, Kaoru Aida, Hideki Fujii, Tetsuro Kobayashi, Shinichi Ohno
Combined analysis of immunostaining for various biological molecules coupled with investigations of ultrastructural features of individual cells is a powerful approach for studies of cellular functions in normal and pathological conditions. However, weak antigenicity of tissues fixed by conventional methods poses a problem for immunoassays. This study introduces a method of correlative light and electron microscopy imaging of the same endocrine cells of compact and diffuse islets from human pancreatic tissue specimens...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29622845/a-newly-defined-area-of-the-mouse-anterior-hypothalamus-involved-in-septohypothalamic-circuit-perifornical-area-of-the-anterior-hypothalamus-pefah
#14
Noriko Horii-Hayashi, Mayumi Nishi
Although the hypothalamus is classified into more than 10 compartments, it still contains uncharacterized areas. In this study, we identified a new triangular-shaped area between the paraventricular hypothalamic nucleus (PVN) and the fornix area in the mouse anterior hypothalamus, which is enriched in chondroitin sulfate proteoglycans (CSPGs). We designated this region as the perifornical area of the anterior hypothalamus (PeFAH) based on its anatomical location. As evidenced by Nissl staining, the PeFAH was distinguishable as an area of relatively low density...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29343881/validation-of-anti-csp%C3%AE-snap25-tyrosine-hydroxylase-ubiquitin-cleaved-caspase-3-and-pser-pkc-motif-antibodies-for-utilization-in-western-blotting
#15
Toshihiko Shirafuji, Takehiko Ueyama, Shigeru Tanaka, Izumi Hide, Naoaki Saito, Norio Sakai
There are many commercial antibodies with little information provided by their suppliers as to their reliability. Accordingly, commercial antibodies require proper validation before being used in scientific research. In this study, we validated several commercial antibodies, including anti-CSPα, SNAP25, tyrosine hydroxylase, ubiquitin, cleaved caspase 3, and pSer PKC motif. Anti-CSPα, SNAP25, and tyrosine hydroxylase antibodies could detect their endogenous target proteins with some degree of cross-reactivity...
December 26, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29343880/novel-application-of-loop-mediated-isothermal-amplification-for-rapid-detection-of-gene-translocation
#16
Ibu Matsuzaki, Hideto Iguchi, Yurina Mikasa, Hiromu Morishita, Katsuya Okuda, Keita Nakaguchi, Yuki Mori, Yoshifumi Iwahashi, Kenji Warigaya, Masakazu Fujimoto, Fumiyoshi Kojima, Shin-Ichi Murata
Identification of fusion genes in cancer is essential for pathological diagnosis and clinical therapy. Although methods for detection of fusion genes, such as fluorescence in situ hybridization (FISH) and real-time polymerase chain reaction (PCR), have been developed in last two decades, these methods are not ideal for detection of these genetic alterations owing to their high cost and time-consuming procedures. In this study, we developed novel application for detection of gene translocations using loop-mediated isothermal amplification (LAMP)...
December 26, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29343879/-ccn3-expression-marks-a-sulfomucin-nonproducing-unique-subset-of-colonic-goblet-cells-in-mice
#17
Shintaro Akiyama, Wakana Mochizuki, Yoichi Nibe, Yuka Matsumoto, Kei Sakamoto, Shigeru Oshima, Mamoru Watanabe, Tetsuya Nakamura
Intestinal goblet cells are characterized by their unique morphology and specialized function to secrete mucins. Although it is known that they are a heterogeneous population of cells, there have been few studies that relate the expression of a particular gene with functionally distinct subpopulations of intestinal goblet cells. Here we show that CCN3 , a gene encoding a member of the CCN family proteins, is induced by inhibition of Notch signaling in colonic epithelial cells and expressed in goblet cells in mice...
December 26, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29343878/cxcl14-like-immunoreactivity-exists-in-somatostatin-containing-endocrine-cells-and-in-the-lamina-propria-and-submucosal-somatostatinergic-nervous-system-of-mouse-alimentary-tract
#18
Hirohumi Suzuki, Kentaro Yamada, Yasuhiro Matsuda, Minoru Onozuka, Toshiharu Yamamoto
In the present study, we investigated the distribution of CXCL14 immunoreactive endocrine cells and neurons in mouse alimentary tract by immunohistochemistry. CXCL14 immunoreactive endocrine cells were found as closed-type cells in the stomach and open-type cells in the small intestine. The immunostaining of these endocrine cells corresponded with that of the somatostatin-containing endocrine cells. Only a few CXCL14 immunoreactive endocrine cells were seen in the large intestine. CXCL14 immunoreactive fibers were observed in the muscular layer from the stomach to the rectum with most abundance in the rectum...
December 26, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29276316/a-new-electron-microscopic-method-to-observe-the-distribution-of-phosphatidylinositol-3-4-bisphosphate
#19
Sharmin Aktar, Sho Takatori, Takuma Tsuji, Minami Orii, Yuki Ohsaki, Jinglei Cheng, Toyoshi Fujimoto
Phosphatidylinositol 3,4-bisphosphate [PtdIns(3,4)P2 ] is a phosphoinositide that plays important roles in signal transduction, endocytosis, and cell migration among others. The intracellular distribution of PtdIns(3,4)P2 has mainly been studied by observing the distribution of GFP-tagged PtdIns(3,4)P2 -binding protein domains in live cells and by labeling with anti-PtdIns(3,4)P2 antibody in fixed cell samples, but these methods only offer low spatial resolution results and may have pitfalls. In the present study, we developed an electron microscopic method to observe the PtdIns(3,4)P2 distribution using the SDS-treated freeze-fracture replica labeling method...
October 24, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29276315/a-device-for-ribbon-collection-for-array-tomography-with-scanning-electron-microscopy
#20
Taro Koike, Yosky Kataoka, Mitsuyo Maeda, Yuji Hasebe, Yuuki Yamaguchi, Mitsuo Suga, Akira Saito, Hisao Yamada
"Array tomography" is a method used to observe the fine structure of cells and tissues in a three-dimensional view. In this method, serial ultrathin sections in the ribbon state (ribbons) are mounted on a solid substrate and observed by scanning electron microscopy (SEM). The method may also be used in conjunction with post-embedding immunocytochemistry. However, it is difficult to mount many serial ribbons on a substrate manually. We developed an inexpensive laboratory-made device that mounts ribbons by pulling a nylon fishing line and lifting the substrate up from the water in a knife boat...
October 24, 2017: Acta Histochemica et Cytochemica
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