Abnormalities in High-Energy Phosphate Metabolism in First-Episode Bipolar Disorder Measured Using 31 P-Magnetic Resonance Spectroscopy

Biol Psychiatry. 2018 Dec 1;84(11):797-802. doi: 10.1016/j.biopsych.2017.03.025. Epub 2017 Apr 7.

Abstract

Background: Brain energy metabolism is critical for supporting synaptic function and information processing. A growing body of evidence suggests abnormalities in brain bioenergetics in psychiatric disorders, including both bipolar disorder (BD) and schizophrenia. 31P magnetic resonance spectroscopy provides a noninvasive window into these processes in vivo. Using this approach, we previously showed that patients with BD show normal adenosine triphosphate (ATP) and phosphocreatine levels at rest but cannot maintain normal ATP levels in the visual cortex during times of high energy demand (photic stimulation). Because ATP is replenished from phosphocreatine via the creatine kinase reaction, we have now measured the creatine kinase forward reaction rate constant in BD.

Methods: We studied 20 patients experiencing a first episode of BD and 28 healthy control participants at 4T and quantified creatine kinase forward reaction rate constant using 31P magnetization transfer magnetic resonance spectroscopy as described previously.

Results: We found a significant reduction in creatine kinase forward reaction rate constant in the BD group (F = 4.692, p = .036), whereas brain ATP and phosphocreatine concentrations, as well as brain parenchymal pH, were normal.

Conclusions: These results pinpoint a specific molecular mechanism underlying our previous observation of an inability to replenish brain ATP during times of high energy demand in BD.

Keywords: ATP; Bioenergetics; Imaging; MRS; Mania; Mitochondria.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism*
  • Adolescent
  • Adult
  • Bipolar Disorder / metabolism*
  • Brain / metabolism*
  • Case-Control Studies
  • Creatine Kinase / metabolism*
  • Energy Metabolism
  • Female
  • Humans
  • Magnetic Resonance Spectroscopy
  • Male
  • Phosphocreatine / metabolism*
  • Photic Stimulation
  • Young Adult

Substances

  • Phosphocreatine
  • Adenosine Triphosphate
  • Creatine Kinase