Control of oxidative phosphorylation by vitamin A illuminates a fundamental role in mitochondrial energy homoeostasis

Rebeca Acin-Perez, Beatrice Hoyos, Feng Zhao, Valerie Vinogradov, Donald A. Fischman, Robert A. Harris, Michael Leitges, Nuttaporn Wongsiriroj, William S. Blaner, Giovanni Manfredi, Ulrich Hammerling

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

The physiology of two metabolites of vitamin A is understood in substantial detail: retinaldehyde functions as the universal chromophore in the vertebrate and invertebrate eye; retinoic acid regulates a set of vertebrate transcription factors, the retinoic acid receptor superfamily. The third member of this retinoid triumvirate is retinol. While functioning as the precursor of retinaldehyde and retinoic acid, a growing body of evidence suggests a far more fundamental role for retinol in signal transduction. Here we show that retinol is essential for the metabolic fitness of mitochondria. When cells were deprived of retinol, respiration and ATP synthesis defaulted to basal levels. They recovered to significantly higher energy output as soon as retinol was restored to physiological concentration, without the need for metabolic conversion to other retinoids. Retinol emerged as an essential cofactor of protein kinase Cδ (PKCδ), without which this enzyme failed to be activated in mitochondria. Furthermore, retinol needed to physically bind PKCδ, because mutation of the retinol binding site rendered PKCδ unresponsive to Rol, while retaining responsiveness to phorbol ester. The PKCδ/retinol complex signaled the pyruvate dehydrogenase complex for enhanced flux of pyruvate into the Krebs cycle. The baseline response was reduced in vitamin A-deficient lecithin:retinol acyl transferase-knockout mice, but this was corrected within 3 h by intraperitoneal injection of vitamin A; this suggests that vitamin A is physiologically important. These results illuminate a hitherto unsuspected role of vitamin A in mitochondrial bioenergetics of mammals, acting as a nutritional sensor. As such, retinol is of fundamental importance for energy homeostasis. The data provide a mechanistic explanation to the nearly 100-yr-old question of why vitamin A deficiency causes so many pathologies that are independent of retinoic acid action.

Original languageEnglish (US)
Pages (from-to)627-636
Number of pages10
JournalFASEB Journal
Volume24
Issue number2
DOIs
StatePublished - Feb 1 2010

Keywords

  • Intermediary metabolism
  • Pyruvate dehydrogenase complex
  • Respiration
  • Retinoid metabolism
  • Signal transduction

ASJC Scopus subject areas

  • Biochemistry
  • Biotechnology
  • Genetics
  • Molecular Biology

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    Acin-Perez, R., Hoyos, B., Zhao, F., Vinogradov, V., Fischman, D. A., Harris, R. A., Leitges, M., Wongsiriroj, N., Blaner, W. S., Manfredi, G., & Hammerling, U. (2010). Control of oxidative phosphorylation by vitamin A illuminates a fundamental role in mitochondrial energy homoeostasis. FASEB Journal, 24(2), 627-636. https://doi.org/10.1096/fj.09-142281