Effects of hypoxic preconditioning on neuroblastoma tumour oxygenation and metabolic signature in a chick embryo model



Al-Mutawa, Yousef K, Herrmann, Anne ORCID: 0000-0002-0858-419X, Corbishley, Catriona, Losty, Paul D ORCID: 0000-0003-0841-5879, Phelan, Marie and See, Violaine ORCID: 0000-0001-6384-8381
(2018) Effects of hypoxic preconditioning on neuroblastoma tumour oxygenation and metabolic signature in a chick embryo model. BIOSCIENCE REPORTS, 38 (4). BSR20180185-.

Access the full-text of this item by clicking on the Open Access link.
[img] Text
Almutawa_revision FINAL 020718.doc - Author Accepted Manuscript

Download (312kB)

Abstract

Hypoxia episodes and areas in tumours have been associated with metastatic dissemination and poor prognosis. Given the link between tumour tissue oxygen levels and cellular metabolic activity, we hypothesised that the metabolic profile between metastatic and non-metastatic tumours would reveal potential new biomarkers and signalling cues. We have used a previously established chick embryo model for neuroblastoma growth and metastasis, where the metastatic phenotype can be controlled by neuroblastoma cell hypoxic preconditioning (3 days at 1% O<sub>2</sub>). We measured, with fibre-optic oxygen sensors, the effects of the hypoxic preconditioning on the tumour oxygenation, within tumours formed by SK-N-AS cells on the chorioallantoic membrane (CAM) of chick embryos. We found that the difference between the metastatic and non-metastatic intratumoural oxygen levels was small (0.35% O<sub>2</sub>), with a mean below 1.5% O<sub>2</sub> for most tumours. The metabolomic profiling, using NMR spectroscopy, of neuroblastoma cells cultured in normoxia or hypoxia for 3 days, and of the tumours formed by these cells showed that the effects of hypoxia <i>in vitro</i> did not compare with <i>in vivo</i> tumours. One notable difference was the high levels of the glycolytic end-products triggered by hypoxia <i>in vitro</i>, but not by hypoxia preconditioning in tumours, likely due to the very high basal levels of these metabolites in tumours compared with cells. In conclusion, we have identified high levels of ketones (3-hydroxybutyrate), lactate and phosphocholine in hypoxic preconditioned tumours, all known to fuel tumour growth, and we herein point to the poor relevance of <i>in vitro</i> metabolomic experiments for cancer research.

Item Type: Article
Uncontrolled Keywords: Cell Line, Tumor, Chick Embryo, Animals, Humans, Neuroblastoma, Disease Models, Animal, Oxygen, Cell Hypoxia, Metabolome, Hypoxia
Depositing User: Symplectic Admin
Date Deposited: 14 Sep 2018 10:40
Last Modified: 19 Jan 2023 01:17
DOI: 10.1042/BSR20180185
Open Access URL: http://www.bioscirep.org/content/38/4/BSR20180185....
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3026205