Mass Spectrometry Imaging Reveals Elevated Glomerular ATP/AMP in Diabetes/obesity and Identifies Sphingomyelin as a Possible Mediator

Satoshi Miyamoto, Cheng Chih Hsu, Gregory Hamm, Manjula Darshi, Maggie Diamond-Stanic, Anne Emilie Declèves, Larkin Slater, Subramaniam Pennathur, Jonathan Stauber, Pieter C. Dorrestein, Kumar Sharma

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36 Citations (Scopus)

Abstract

AMP-activated protein kinase (AMPK) is suppressed in diabetes and may be due to a high ATP/AMP ratio, however the quantitation of nucleotides in vivo has been extremely difficult. Via matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) to localize renal nucleotides we found that the diabetic kidney had a significant increase in glomerular ATP/AMP ratio. Untargeted MALDI-MSI analysis revealed that a specific sphingomyelin species (SM(d18:1/16:0)) accumulated in the glomeruli of diabetic and high-fat diet-fed mice compared with wild-type controls. In vitro studies in mesangial cells revealed that exogenous addition of SM(d18:1/16:0) significantly elevated ATP via increased glucose consumption and lactate production with a consequent reduction of AMPK and PGC1α. Furthermore, inhibition of sphingomyelin synthases reversed these effects. Our findings suggest that AMPK is reduced in the diabetic kidney due to an increase in the ATP/AMP ratio and that SM(d18:1/16:0) could be responsible for the enhanced ATP production via activation of the glycolytic pathway.

Original languageEnglish
Pages (from-to)121-134
Number of pages14
JournalEBioMedicine
Volume7
DOIs
Publication statusPublished - May 1 2016

Keywords

  • AMPK
  • ATP
  • Chronic kidney disease
  • Glycolysis
  • Matrix-assisted laser desorption/ionization mass spectrometry imaging
  • Sphingomyelin

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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  • Cite this

    Miyamoto, S., Hsu, C. C., Hamm, G., Darshi, M., Diamond-Stanic, M., Declèves, A. E., Slater, L., Pennathur, S., Stauber, J., Dorrestein, P. C., & Sharma, K. (2016). Mass Spectrometry Imaging Reveals Elevated Glomerular ATP/AMP in Diabetes/obesity and Identifies Sphingomyelin as a Possible Mediator. EBioMedicine, 7, 121-134. https://doi.org/10.1016/j.ebiom.2016.03.033