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DEFINING PHYSIOLOGICAL NORMOXIA FOR IMPROVED TRANSLATION OF CELL PHYSIOLOGY TO ANIMAL MODELS AND HUMANS

期刊

PHYSIOLOGICAL REVIEWS
卷 99, 期 1, 页码 161-234

出版社

AMER PHYSIOLOGICAL SOC
DOI: 10.1152/physrev.00041.2017

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资金

  1. British Heart Foundation [FS/13/66/30445, PG/13/1/29801]
  2. Heart Research UK (Novel Emerging Technologies) [RG2633]

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The extensive oxygen gradient between the air we breathe (PO2 similar to 21 kPa) and its ultimate distribution within mitochondria (as low as similar to 0.5-1 kPa) is testament to the efforts expended in limiting its inherent toxicity. It has long been recognized that cell culture undertaken under room air conditions falls short of replicating this protection in vitro. Despite this, difficulty in accurately determining the appropriate O-2 levels in which to culture cells, coupled with a lack of the technology to replicate and maintain a physiological O-2 environment in vitro, has hindered addressing this issue thus far. In this review, we aim to address the current understanding of tissue PO2 distribution in vivo and summarize the attempts made to replicate these conditions in vitro. The state-of-the-art techniques employed to accurately determine O-2 levels, as well as the issues associated with reproducing physiological O-2 levels in vitro, are also critically reviewed. We aim to provide the framework for researchers to undertake cell culture under O-2 levels relevant to specific tissues and organs. We envisage that this review will facilitate a paradigm shift, enabling translation of findings under physiological conditions in vitro to disease pathology and the design of novel therapeutics.

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