Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-1253
Wenger, R H; Marti, H H; Schuerer-Maly, C C; Kvietikova, I; Bauer, C; Gassmann, M; Maly, F E (1996). Hypoxic induction of gene expression in chronic granulomatous disease-derived B-cell lines: oxygen sensing is independent of the cytochrome b558-containing nicotinamide adenine dinucleotide phosphate oxidase. Blood, 87(2):756-761.
Reduced oxygenation of a variety of cells results in transcriptional upregulation of several genes, including the hematopoietic hormone erythropoietin, the angiogenic vascular endothelial growth factor (VEGF), and glycolytic enzymes such as aldolase. Recently, the heme protein cytochrome b558 of the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase complex has been proposed as a key component of the oxygen-sensing mechanism. Cytochrome b558 consists of the p22phox and gp91phox subunits and is essential for superoxide generation in phagocytes and B lymphocytes. Mutations in these subunits result in cytochrome b558-negative chronic granulomatous disease (cytb- CGD), an inherited disorder in humans characterized by reduced microbicidal activity due to deficient superoxide generation. To test whether NADPH oxidase is involved in oxygen sensing, we exposed wild-type B-cell lines as well as cytb- CGD-derived B cell lines, deficient in either p22phox or gp91phox, to hypoxia (1% oxygen) or CoCl2 (100 mumol/L) and compared the mRNA levels of VEGF and aldolase with the untreated controls. Northern blot analysis revealed unimpaired basal and inducible expression of VEGF and aldolase mRNA in all four cytb- CGD-derived B-cell lines compared with wild-type cells. Furthermore, reconstitution of cytochrome b558 expression in cytb- CGD-derived B cells by transfection with p22phox or gp91phox expression vectors did not modify VEGF and aldolase mRNA expression. Thus, cytochrome b558 of the NADPH oxidase complex appears not to be essential for hypoxia-activated gene expression and can be excluded as a candidate for the putative universal oxygen sensor.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Institute of Physiology|
07 Faculty of Science > Institute of Physiology
|DDC:||570 Life sciences; biology|
|Date:||15 January 1996|
|Deposited On:||11 Feb 2008 13:21|
|Last Modified:||27 Nov 2013 20:32|
|Publisher:||American Society of Hematology|
|Additional Information:||This research was originally published in Blood, 1996; 87(2):756-61. Copyright by the American Society of Hematology|
|Related URLs:||http://bloodjournal.hematologylibrary.org/cgi/content/abstract/87/2/756 (Publisher)|
|Citations:||Web of Science®. Times Cited: 65|
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