Effects of oxygen on mouse embryonic stem cell growth, phenotype retention, and cellular energetics.

Biotechnology and Bioengineering
Daryl E PowersClark K Colton

Abstract

Most embryonic stem (ES) cell research is performed with a gas phase oxygen partial pressure (pO(2)) of 142 mmHg, whereas embryonic cells in early development are exposed to pO(2) values of 0-30 mmHg. To understand effects of these differences, we studied murine ES (mES) growth, maintenance of stem cell phenotype, and cell energetics over a pO(2) range of 0-285 mmHg, in the presence or absence of differentiation-suppressing leukemia inhibitory factor (LIF). With LIF, growth rate was sensitive to pO(2) but constant with time, and expression of self-renewal transcription factors decreased at extremes of pO(2). Subtle morphological changes suggested some early differentiation, but cells retained the ability to differentiate into derivatives of all three germ layers at low pO(2). Without LIF, growth rate decreased with time, and self-renewal transcription factor mRNA decreased further. Gross morphological changes occurred, and overt differentiation occurred at all pO(2). These findings suggested that hypoxia in the presence of LIF promoted limited early differentiation. ES cells survived oxygen starvation with negligible cell death by increasing anaerobic metabolism within 48 h of anoxic exposure. Decreasing pO(2) to 36 mmHg or low...Continue Reading

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