Artículo del mes
abril 2017

Programmed mitophagy is essential for the glycolytic switch during cell differentiation

Referencia artículo:
The EMBO Journal (2017) e201695916.
La degradación de mitocondrias por autofagia o mitofagia, es esencial para producir una reprogramación metabólica hacia glicolisis que es necesaria para la diferenciación de las células ganglionares de la retina. Este proceso de mitofagia programada está regulado por NIX, un receptor de mitofagia cuya expresión incrementa por la hipoxia del tejido en desarrollo.
Resumen
Retinal ganglion cells (RGCs) are the sole projecting neurons of the retina and their axons form the optic nerve. Here, we show that embryogenesis-associated mouse RGC differentiation depends on mitophagy, the programmed autophagic clearance of mitochondria. The elimination of mitochondria during RGC differentiation was coupled to a metabolic shift with increased lactate production and elevated expression of glycolytic enzymes at the mRNA level. Pharmacological and genetic inhibition of either mitophagy or glycolysis consistently inhibited RGC differentiation. Local hypoxia triggered expression of the mitophagy regulator BCL2/adenovirus E1B 19-kDa-interacting protein 3-like (BNIP3L, best known as NIX) at peak RGC differentiation. Retinas from NIX-deficient mice displayed increased mitochondrial mass, reduced expression of glycolytic enzymes and decreased neuronal differentiation. Similarly, we provide evidence that NIX-dependent mitophagy contributes to mitochondrial elimination during macrophage polarization towards the proinflammatory and more glycolytic M1 phenotype, but not to M2 macrophage differentiation, which primarily relies on oxidative phosphorylation. In summary, developmentally controlled mitophagy promotes a metabolic switch towards glycolysis, which in turn contributes to cellular differentiation in several distinct developmental contexts.
Sobre el grupo investigador