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Cancer Cell International
Published in: Cancer Cell International 1/2010

Open Access 01-12-2010 | Primary research

Hypoxic regulation of cytoglobin and neuroglobin expression in human normal and tumor tissues

Authors: Marwan Emara, A Robert Turner, Joan Allalunis-Turner

Published in: Cancer Cell International | Issue 1/2010

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Abstract

Background

Cytoglobin (Cygb) and neuroglobin (Ngb) are recently identified globin molecules that are expressed in vertebrate tissues. Upregulation of Cygb and Ngb under hypoxic and/or ischemic conditions in vitro and in vivo increases cell survival, suggesting possible protective roles through prevention of oxidative damage. We have previously shown that Ngb is expressed in human glioblastoma multiforme (GBM) cell lines, and that expression of its transcript and protein can be significantly increased after exposure to physiologically relevant levels of hypoxia. In this study, we extended this work to determine whether Cygb is also expressed in GBM cells, and whether its expression is enhanced under hypoxic conditions. We also compared Cygb and Ngb expression in human primary tumor specimens, including brain tumors, as well as in human normal tissues. Immunoreactivity of carbonic anhydrase IX (CA IX), a hypoxia-inducible metalloenzyme that catalyzes the hydration of CO2 to bicarbonate, was used as an endogenous marker of hypoxia.

Results

Cygb transcript and protein were expressed in human GBM cells, and this expression was significantly increased in most cells following 48 h incubation under hypoxia. We also showed that Cygb and Ngb are expressed in both normal tissues and human primary cancers, including GBM. Among normal tissues, Cygb and Ngb expression was restricted to distinct cell types and was especially prominent in ductal cells. Additionally, certain normal organs (e.g. stomach fundus, small bowel) showed distinct regional co-localization of Ngb, Cygb and CA IX. In most tumors, Ngb immunoreactivity was significantly greater than that of Cygb. In keeping with previous in vitro results, tumor regions that were positively stained for CA IX were also positive for Ngb and Cygb, suggesting that hypoxic upregulation of Ngb and Cygb also occurs in vivo.

Conclusions

Our finding of hypoxic up-regulation of Cygb/Ngb in GBM cell lines and human tumor tissues suggests that these globin molecules may be part of the repertoire of defense mechanisms that allow cancer cells to survive in hypoxic microenvironments.
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Metadata
Title
Hypoxic regulation of cytoglobin and neuroglobin expression in human normal and tumor tissues
Authors
Marwan Emara
A Robert Turner
Joan Allalunis-Turner
Publication date
01-12-2010
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2010
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/1475-2867-10-33

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