Distinctions and similarities of cell bioenergetics and the role of mitochondria in hypoxia, cancer, and embryonic development

The International Journal of Biochemistry & Cell Biology
Petr JezekRodrigue Rossignol

Abstract

In this review we compare situations under which the major cellular role of mitochondria, oxidative phosphorylation (OXPHOS), is transiently suppressed. Two types of cellular bioenergetics exist, related to the predominance of glycolysis either disconnected or fully connected to OXPHOS: i) "glycolytic" phenotype, when the glycolytic end-product pyruvate is marginally used for OXPHOS; and, ii) OXPHOS phenotype with fully developed and active OXPHOS machinery consuming all pyruvate. A switch to glycolytic phenotype is typically orchestrated by gene reprogramming due to AMP-activated protein kinase, hypoxia-induced factor (HIF), NFkappaB, mTOR, and by oncogenes. At normoxia a continuous hydroxylation of HIF1alpha prolines by prolyl hydroxylase domain enzymes (PHDs) and asparagines by factor-inhibiting HIF (FIH) occurs, resulting in HIF1alpha polyubiquitination/degradation. With O(2) below a threshold level (<5% O(2)) cytosolic H(2)O(2) raises and oxidizes Fe(2+) of PHDs and FIH, inactivates them, thus stabilizing HIFalpha and upregulating transcription of specific genes. The source of H(2)O(2) burst (not manifested in isolated mitochondria) is the respiratory chain Complex III Q(O) site. Frequently hypoxic microenvironment of mali...Continue Reading

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