Distinct intracellular sAC-cAMP domains regulate ER Ca2+signaling and OXPHOS function Academic Article uri icon

Overview

MeSH Major

  • Brain
  • Electron Transport Complex II
  • Mitochondria
  • Myocardium
  • Oxaloacetic Acid

abstract

  • cAMP regulates a wide variety of physiological functions in mammals. This single second messenger can regulate multiple, seemingly disparate functions within independently regulated cell compartments. We have previously identified one such compartment inside the matrix of the mitochondria, where soluble adenylyl cyclase (sAC) regulates oxidative phosphorylation (OXPHOS). We now show that sAC knockout fibroblasts have a defect in OXPHOS activity and attempt to compensate for this defect by increasing OXPHOS proteins. Importantly, sAC knockout cells also exhibit decreased probability of endoplasmic reticulum (ER) Ca(2+) release associated with diminished phosphorylation of the inositol 3-phosphate receptor. Restoring sAC expression exclusively in the mitochondrial matrix rescues OXPHOS activity and reduces mitochondrial biogenesis, indicating that these phenotypes are regulated by intramitochondrial sAC. In contrast, Ca(2+) release from the ER is only rescued when sAC expression is restored throughout the cell. Thus, we show that functionally distinct, sAC-defined, intracellular cAMP signaling domains regulate metabolism and Ca(2+) signaling.

publication date

  • January 2017

Research

keywords

  • Academic Article

Identity

Language

  • eng

Digital Object Identifier (DOI)

  • 10.1242/jcs.206318

PubMed ID

  • 28864766

Additional Document Info

start page

  • 3713

end page

  • 3727

volume

  • 130

number

  • 21