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https://www.readbyqxmd.com/read/28295343/epithelial-membrane-protein-2-emp2-deficiency-alters-placental-angiogenesis-mimicking-features-of-human-placental-insufficiency
#1
Carmen J Williams, Alison Chu, Wendy N Jefferson, David Casero, Deepthi Sudhakar, Nevil Khurana, Claire P Hogue, Chinmayi Aryasomayajula, Priya Patel, Peggy Sullivan, Elizabeth Padilla-Banks, Shabnam Mohandessi, Carla Janzen, Madhuri Wadehra
Epithelial membrane protein-2 (EMP2) is a tetraspan protein predicted to regulate placental development. Highly expressed in secretory endometrium and trophectoderm cells, previous studies suggest that it may regulate implantation by orchestrating the surface expression of integrins and other membrane proteins. In order to test the role of EMP2 in pregnancy, mice lacking EMP2 (Emp2(-/-) ) were generated. Emp2(-/-) females are fertile but have reduced litter sizes when carrying Emp2(-/-) but not Emp2(+/-) fetuses...
March 14, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28278175/pneumococcal-infection-of-respiratory-cells-exposed-to-welding-fumes-role-of-oxidative-stress-and-hif-1-alpha
#2
Jonathan Grigg, Lisa Miyashita, Reetika Suri
Welders are more susceptible to pneumococcal pneumonia. The mechanisms are yet unclear. Pneumococci co-opt the platelet activating factor receptor (PAFR) to infect respiratory epithelial cells. We previously reported that exposure of respiratory cells to welding fumes (WF), upregulates PAFR-dependent pneumococcal infection. The signaling pathway for this response is unknown, however, in intestinal cells, hypoxia-inducible factor-1 α (HIF 1α) is reported to mediate PAFR-dependent infection. We sought to assess whether oxidative stress plays a role in susceptibility to pneumococcal infection via the platelet activating factor receptor...
2017: PloS One
https://www.readbyqxmd.com/read/28263965/l-2-hydroxyglutarate-production-arises-from-noncanonical-enzyme-function-at-acidic-ph
#3
Andrew M Intlekofer, Bo Wang, Hui Liu, Hardik Shah, Carlos Carmona-Fontaine, Ariën S Rustenburg, Salah Salah, M R Gunner, John D Chodera, Justin R Cross, Craig B Thompson
The metabolite 2-hydroxyglutarate (2HG) can be produced as either a D-R- or L-S- enantiomer, each of which inhibits α-ketoglutarate (αKG)-dependent enzymes involved in diverse biologic processes. Oncogenic mutations in isocitrate dehydrogenase (IDH) produce D-2HG, which causes a pathologic blockade in cell differentiation. On the other hand, oxygen limitation leads to accumulation of L-2HG, which can facilitate physiologic adaptation to hypoxic stress in both normal and malignant cells. Here we demonstrate that purified lactate dehydrogenase (LDH) and malate dehydrogenase (MDH) catalyze stereospecific production of L-2HG via 'promiscuous' reduction of the alternative substrate αKG...
March 6, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28251972/-zinc-induces-normoxic-accumulation-of-transcriptionally-active-hypoxia-inducible-factor-1-alpha-in-mammary-epithelial-cells
#4
S-Y Lee, S Mustafa, Y-W Ching, N Shafee
Both zinc and the α-subunit of hypoxia-inducible factor (HIF-1α) play important roles in the remodelling of mammary gland tissues. In the present study, we examined the level and the transcriptional activity of HIF-1α in mammary cells upon zinc treatment. In MCF-7 mammary adenocarcinoma and MCF-10A mammary epithelial cell lines, the toxicity levels of zinc differ. Interestingly, both cell lines overexpress HIF-1α following zinc treatment. As it was evident from an up-regulation of its specific target gene CA9 that encodes carbonic anhydrase IX, the stabilized HIF-1α translocated to the nucleus and was transcriptionally active...
January 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28243027/effects-of-histone-deacetylase-inhibitor-valproic-acid-on-the-expression-of-hypoxia-inducible-factor-1-alpha-in-human-retinal-m%C3%A3-ller-cells
#5
Young Jun Kim, Sang Jun Park, Na Rae Kim, Hee Seung Chin
PURPOSE: To evaluate the effects of valproic acid (VPA), a histone deacetylase inhibitor (HDACI), on the expression of hypoxia-inducible factor-1 alpha (HIF-1α) and vascular endothelial growth factor (VEGF) in human retinal Müller cells under hypoxic conditions. METHODS: Chemical hypoxia was induced in human retinal Müller cells (MIO-M1) by treatment with increasing concentrations of cobalt(II) chloride (CoCl2). Müller cells were also treated with a set concentration of CoCl2, along with various concentrations of VPA...
February 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28238093/role-of-hif-1%C3%AE-and-caspase-3-in-cystogenesis-of-odontogenic-cysts-and-tumors
#6
Natacha M M da Costa, Adriane S de Siqueira, André L R Ribeiro, Maria S da Silva Kataoka, Ruy G Jaeger, Sérgio M de Alves-Júnior, Andrew M Smith, João de Jesus Viana Pinheiro
OBJECTIVES: Odontogenic cysts and tumors are the most relevant lesions that affect the gnathic bones. These lesions have in common the formation of cystic areas and this common feature may suggest involvement of similar mechanisms. The hypoxia inducible factor 1 alpha (HIF-1α), a responsive protein to hypoxia and caspase-3, an irreversible apoptosis marker, may contribute to cyst formation. Thus, this study aimed to investigate the immunoexpression of these proteins in odontogenic cysts and tumors...
February 25, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28230075/oxygen-impairs-oligodendroglial-development-via-oxidative-stress-and-reduced-expression-of-hif-1%C3%AE
#7
Christina Brill, Till Scheuer, Christoph Bührer, Stefanie Endesfelder, Thomas Schmitz
The premature increase of oxygen tension may contribute to oligodendroglial precursor cell (OPC) damage in preterm infants. Fetal OPCs are exposed to low oxygen tissue tensions not matched when cells are cultured in room air. Maturation (A2B5, O4, O1, MBP, CNP, arborization), oxidative stress (nitrotyrosine Western blot, NRF2 and SOD2 expression), apoptosis (TUNEL), proliferation (Ki67), and expression of transcription factors regulated by Hypoxia-Inducible-Factor-1-alpha (Hif-1α) expressed in OPCs (Olig1, Olig2, Sox9, Sox10) were assessed in rat OPCs and OLN93 cells cultured at 5% O2 and 21% O2...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28212880/automatic-detection-of-hypoxia-in-renal-tissue-stained-with-hif-1alpha
#8
Aline Rodrigues Buzin, Nayana Damiani Macedo, Isabela Bastos Binotti Abreu De Araujo, Breno Valentim Nogueira, Tadeu Uggere de Andrade, Denise Coutinho Endringer, Dominik Lenz
OBJECTIVE: The objective of this study was the identification of the stain HIF-alpha using the Image Cytometry, and to help to count the positive cells (with HIF-alpha) and the negative cells (without HIF-alpha) from the same sample. METHOD: 17 images of renal tissues from male rats of Winstar lineage; overall, there were 12.587 objects (cells) in the images for analysis. The acquired images were then analyzed through the free softwares CellProfiler (version 2.1...
February 14, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28198519/correlation-of-hypoxia-inducible-transcription-factor-in-breast-cancer-and-suvmax-of-f-18-fdg-pet-ct
#9
COMPARATIVE STUDY
Young-Ju Jeong, Jae-Won Jung, Yoon-Young Cho, Sung-Hwan Park, Hoon-Kyu Oh, Sungmin Kang
BACKGROUND: Tumor hypoxia induces the expression of several genes via the hypoxia-inducible transcription factor-1 alpha (HIF-1a). It is associated with the prognosis of several cancers. We studied the immunohistochemical expression of HIF-1a in patients with invasive ductal cancer (IDC) of the breast and the possible correlation with the maximum standardized uptake value of the primary tumor (pSUVmax) as well as other biological parameters. Prognostic significance of pSUVmax and expression of HIF-1a for the prediction of progression-free survival (PFS) was also assessed...
2017: Nuclear Medicine Review. Central & Eastern Europe
https://www.readbyqxmd.com/read/28183349/hif-1%C3%AE-inhibitor-echinomycin-reduces-acute-graft-versus-host-disease-and-preserves-graft-versus-leukemia-effect
#10
Yushi Yao, Lei Wang, Jihao Zhou, Xinyou Zhang
BACKGROUND: Acute graft-versus-host disease (aGVHD) remains a major obstacle against favorable clinical outcomes following allogeneic hematopoietic stem cell transplantation (allo-HSCT). T helper cells including Th17 play key roles in aGVHD pathogenesis. Donor regulatory T cell (Tregs) adoptive therapy reduces aGVHD without weakening graft-versus-leukemia effect (GVL) in both mouse and human, although the purification and ex vivo expansion of Tregs in clinical scenarios remain costly and technically demanding...
February 10, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28183202/mesothelial-cell-autoantibodies-upregulate-transcription-factors-associated-with-fibrosis
#11
John Gilmer, Tanner Harding, Linda Woods, Brad Black, Raja Flores, Jean Pfau
Amphibole asbestos exposure is associated with the production of mesothelial cell autoantibodies (MCAA). These MCAA have been linked with pleural fibrotic disease in the asbestos exposed community of Libby, Montana, and induce collagen deposition by cultured mesothelial cells. However, the exact intracellular mechanism by which these autoantibodies cause an increase in collagen deposition remains unknown. This study sought to gain insight into the transcription factors involved in the collagen production after human mesothelial cells are exposed to MCAA...
January 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28173667/-expression-of-hypoxia-inducible-factor-1%C3%AE-glucose-transporter-1-and-lactate-dehydrogenase-5-in-colorectal-cancer-and-clinicopathologic-significance
#12
T Y Yang, L S Hao, D Z Guo
Objective: To investigate the expression and clinicopathological significance of hypoxia-inducible factor 1 alpha (HIF-1α), glucose transporter 1(GLUT-1) and lactate dehydrogenase(LDH)-5 in colorectal cancer. Methods: The expression levels of HIF-1α, GLUT-1 and LDH-5 were detected by immunohistochemical staining in 142 specimens of human carcinoma in comparison with adjacent normal tissues. Results: The expression levels of HIF-1α(78.2%, 111/142), GLUT-1(75.4%, 107/142) and LDH-5(68.3%, 97/142) were higher in tumor tissues than in adjacent normal tissues(14...
February 8, 2017: Zhonghua Bing Li Xue za Zhi Chinese Journal of Pathology
https://www.readbyqxmd.com/read/28169245/evaluation-of-hypoxia-inducible-factor-1-alpha-gene-expression-in-colorectal-cancer-stages-of-iranian-patients
#13
Reyhaneh Nassiri Mansour, Seyed Ehsan Enderami, Abdolreza Ardeshirylajimi, Koorosh Fooladsaz, Mojtaba Fathi, Shahla Moahammad Ganji
AIM OF STUDY: Colorectal cancer (CRC) is the fourth most prevalent cancer globally. Several factors have roles in cancer establishment. One of the most important factors is hypoxia that induces hypoxia inducible factor-1 (HIF-1). The HIF-1 alpha overexpressed in hypoxia conditions and plays a pivotal role in carcinogenesis features. In this study, we aimed to examine the efficiency of HIF-1 alpha gene expression at mRNA and protein's level for CRC diagnosing and staging. MATERIALS AND METHODS: In this study, the cases included into 75 cancer specimens in different stages (Group 2 = Stage 1, Group 3 = Stage 2, and Group 4 = Stage 3, 4) and ten normal specimens as control (Group 1)...
October 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28165644/hif1a-gene-polymorphisms-and-human-diseases-graphical-review-of-97-association-studies
#14
REVIEW
I Gladek, J Ferdin, S Horvat, G A Calin, T Kunej
Hypoxia-inducible factors (HIFs) belong to a family of transcription factors (TF) responsive to a low O2 availability, which is often a characteristic feature of solid tumors. The alpha subunit of the HIF heterodimer is O2 -sensitive, and once stabilized in hypoxia, it functions as a master regulator of various genes involved in hypoxia pathway. Changes in the HIF1A (hypoxia inducible factor 1, alpha subunit) nucleotide sequence or expression has been shown to be associated with development of several diseases...
February 6, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28143503/genetic-polymorphisms-in-key-hypoxia-regulated-downstream-molecules-and-phenotypic-correlation-in-prostate-cancer
#15
MULTICENTER STUDY
Avelino Fraga, Ricardo Ribeiro, André Coelho, José Ramon Vizcaíno, Helena Coutinho, José Manuel Lopes, Paulo Príncipe, Carlos Lobato, Carlos Lopes, Rui Medeiros
BACKGROUND: In this study we sought if, in their quest to handle hypoxia, prostate tumors express target hypoxia-associated molecules and their correlation with putative functional genetic polymorphisms. METHODS: Representative areas of prostate carcinoma (n = 51) and of nodular prostate hyperplasia (n = 20) were analysed for hypoxia-inducible factor 1 alpha (HIF-1α), carbonic anhydrase IX (CAIX), lysyl oxidase (LOX) and vascular endothelial growth factor (VEGFR2) immunohistochemistry expression using a tissue microarray...
January 31, 2017: BMC Urology
https://www.readbyqxmd.com/read/28115494/hif1a-and-epas1-potentiate-hypoxia-induced-upregulation-of-inhibin-alpha-chain-expression-in-human-term-cytotrophoblasts-in-vitro
#16
C L Depoix, I de Selliers, C Hubinont, F Debieve
STUDY QUESTION: Are hypoxia-inducible factors (HIF) responsible for the potentiation of inhibin alpha subunit (INHA) gene expression in primary cultures of human term cytotrophoblasts under low-oxygen tension? SUMMARY ANSWER: Both HIF1A and endothelial PAS domain protein 1 (EPAS1) are involved in the potentiation of INHA gene upregulation in cytotrophoblasts cultured under hypoxia. WHAT IS KNOWN ALREADY: During the in vitro differentiation of cytotrophoblasts into syncytiotrophoblasts under 21% O2, INHA expression increases...
January 23, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28108482/inhibition-of-prolyl-4-hydroxylase-decreases-muscle-fibrosis-following-chronic-rotator-cuff-tear
#17
J P Gumucio, M D Flood, A Bedi, H F Kramer, A J Russell, C L Mendias
OBJECTIVES: Rotator cuff tears are among the most frequent upper extremity injuries. Current treatment strategies do not address the poor quality of the muscle and tendon following chronic rotator cuff tears. Hypoxia-inducible factor-1 alpha (HIF-1α) is a transcription factor that activates many genes that are important in skeletal muscle regeneration. HIF-1α is inhibited under normal physiological conditions by the HIF prolyl 4-hydroxylases (PHDs). In this study, we used a pharmacological PHD inhibitor, GSK1120360A, to enhance the activity of HIF-1α following the repair of a chronic cuff tear, and measured muscle fibre contractility, fibrosis, gene expression, and enthesis mechanics...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28108309/hypoxia-enhances-the-viability-growth-and-chondrogenic-potential-of-cryopreserved-human-adipose-derived-stem-cells
#18
Wan Kamarul Zaman Wan Safwani, Jane Ru Choi, Kar Wey Yong, Iris Ting, Noor Azmi Mat Adenan, Belinda Pingguan-Murphy
Cryopreservation is the only existing method of storage of human adipose-derived stem cells (ASCs) for clinical use. However, cryopreservation has been shown to be detrimental to ASCs, particularly in term of cell viability. To restore the viability of cryopreserved ASCs, it is proposed to culture the cells in a hypoxic condition. To this end, we aim to investigate the effect of hypoxia on the cryopreserved human ASCs in terms of not only cell viability, but also their growth and stemness properties, which have not been explored yet...
January 17, 2017: Cryobiology
https://www.readbyqxmd.com/read/28070042/-effect-of-jianpi-jiedu-formula-on-tumor-angiogenesis-relevant-genes-expression-in-colorectal-cancer
#19
Dan Mao, Sanlin Lei, Jin'an Ma, Li Shi, Shaofan Zhang, Jianhua Huang, Xinyi Liu, Dengfeng Ding, Yingjin Zhang, Lei Feng, Sifang Zhang
To investigate the effect of the jianpi-jiedu formula (JPJD) on the expression of angiogenesis-relevant genes in colon cancer.
 Methods: Crude extract was obtained from JPJD by water extract method. The effect of JPJD crude extract on colon cancer cell proliferation capacity was determined by MTT assays. The IC50 value was calculated by GraphPad Prism5 software. Affymetrix gene expression profiling chip was used to detect significant differences in expressions of genes after JPJD intervention, and pathway enrichment analysis was performed to analyze the differentially expressed genes...
December 28, 2016: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28062918/glycine-decarboxylase-and-hif-1%C3%AE-expression-are-negative-prognostic-factors-in-primary-resected-early-stage-non-small-cell-lung-cancer
#20
Sabina Berezowska, José A Galván, Rupert Langer, Lukas Bubendorf, Spasenija Savic, Mathias Gugger, Ralph A Schmid, Thomas M Marti
Glycine decarboxylase (GLDC) was recently described as a critical enzyme of tumor-initiating cells and, thus, a driver of tumorigenesis in lung non-small cell cancer (NSCC). It is important in metabolism under hypoxic conditions. Hypoxia-inducible factor 1-alpha (HIF-1α) is the unique subunit that determines HIF system activity, thereby regulating the adverse effects of hypoxia on cancer outcome. We examined the expression and prognostic significance of GLDC and HIF-1α in primary resected stage I/II NSCC...
March 2017: Virchows Archiv: An International Journal of Pathology
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