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CD26 hypoxia

Laurie Bruzzese, Jean-Claude Rostain, Laëtitia Née, Jocelyne Condo, Giovanna Mottola, Nabil Adjriou, Laurence Mercier, Jean-Louis Berge-Lefranc, Julien Fromonot, Nathalie Kipson, Michel Lucciano, Josée-Martine Durand-Gorde, Yves Jammes, Régis Guieu, Jean Ruf, Emmanuel Fenouillet
The nucleoside adenosine acts on the nervous and cardiovascular systems via the A2A receptor (A2AR). In response to oxygen level in tissues, adenosine plasma concentration is regulated in particular via its synthesis by CD73 and via its degradation by adenosine deaminase (ADA). The cell-surface endopeptidase CD26 controls the concentration of vasoactive and antioxidant peptides and hence regulates the oxygen supply to tissues and oxidative stress response. Although overexpression of adenosine, CD73, ADA, A2AR, and CD26 in response to hypoxia is well documented, the effects of hyperoxic and hyperbaric conditions on these elements deserve further consideration...
July 15, 2015: Journal of Applied Physiology
Chin Wen Tan, Yie Hou Lee, Heng Hao Tan, Matthew Sie Kuei Lau, Mahesh Choolani, Linda Griffith, Jerry Kok Yen Chan
OBJECTIVE: To test the hypothesis that endometrial stromal cells (ESCs) in endometriosis exhibit increased cell motility under hypoxia. DESIGN: Prospective case-control study. SETTING: University research laboratory. PATIENT(S): Women with endometriosis (n = 18) or benign gynecological disease (n=19). INTERVENTION(S): Eutopic ESCs were cultured under normoxia (20% O2) or hypoxia (6.5% O2), and migration and invasion capacity assayed, with pathway-focused polymerase chain reaction (PCR) array and ELISAs performed...
July 2014: Fertility and Sterility
V Mareš, J Stremeňová, V Lisá, H Kozáková, J Marek, M Syrůček, O Šoula, A Šedo
γ-Glutamyltranspeptidase (GGT, syn. γ-Glutamyltransferase) and dipeptidylpeptidase-IV (DPP-IV) activity participates in metabolic and growth control of normal and tumor cells by processing biologically active peptides. Here, we report on up-regulation of these enzymes in human brain gliomas determined by catalytic enzyme histochemistry and immunocytochemistry. Higher activity of GGT was found in 50%, 68% and 81% of WHO grade II, III and IV tumors, respectively. The process started at/near the microvasculature, from where it spread to the parenchyma...
July 2012: Histology and Histopathology
Jin-Song Wang, Xia Liu, Zhen-Yi Xue, Lee Alderman, Justin U Tilan, Remi Adenika, Stephen E Epstein, Mary Susan Burnett
BACKGROUND: Molecular analysis of neovascularization related genes by time course in response to ischemia has not been described in the context of aging. We aimed to provide a progressively deeper understanding of how aging compromises neovascularization. METHODS: Young (3-month) and old (18-month) C57Bl mice were subjected to left hindlimb ischemia. Necrosis score was evaluated in calf muscles. Calf muscles, peripheral blood, bone marrow were harvested at different time points...
April 2011: Chinese Medical Journal
Mary Carmen Pérez-Aguilar, Loredana Goncalves, Alba Ibarra, Rafael Bonfante-Cabarcas
Adenosine deaminase (ADA) is an enzyme of purine metabolism which has been the subject of much interest because the congenital defect of this enzyme causes severe combined immunodeficiency syndrome. One of the three isoforms of the enzyme (ecto-ADA) is capable of binding to the glycoprotein CD26 and adenosine receptors A1 and A2B. ADA-CD26 interaction produces a costimulatory signal in the events of T cell activation and secretion of IFN-gamma, TNF-alpha and IL-6. During this activation, the enzyme activity is regulated positively by IL-2 and IL-12 and negatively by IL-4, based on the mechanism of translocation...
December 2010: Investigación Clínica
Annemie Van Linden, Holger K Eltzschig
Numerous parallels exist between limited oxygen availability (hypoxia) and acute inflammation. The lungs in particular are prone to acute inflammation during hypoxia, resulting in pulmonary edema, vascular leakage and neutrophil infiltration. The innate response elicited by hypoxia is associated with increased extracellular adenosine effects. Although studies on acute pulmonary hypoxia show a protective role of extracellular adenosine by attenuating pulmonary edema and excessive inflammation, chronic elevation of pulmonary adenosine may be detrimental...
September 2007: Expert Opinion on Biological Therapy
Holger K Eltzschig, Marion Faigle, Simone Knapp, Jorn Karhausen, Juan Ibla, Peter Rosenberger, Kirsten C Odegard, Peter C Laussen, Linda F Thompson, Sean P Colgan
Extracellular levels of adenosine increase during hypoxia. While acute increases in adenosine are important to counterbalance excessive inflammation or vascular leakage, chronically elevated adenosine levels may be toxic. Thus, we reasoned that clearance mechanisms might exist to offset deleterious influences of chronically elevated adenosine. Guided by microarray results revealing induction of endothelial adenosine deaminase (ADA) mRNA in hypoxia, we used in vitro and in vivo models of adenosine signaling, confirming induction of ADA protein and activity...
September 1, 2006: Blood
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