Myocardial regulation of lipidomic flux by cardiolipin synthase: Setting the beat for bioenergetic efficiency

Michael A. Kiebish, Kui Yang, Harold F. Sims, Christopher M. Jenkins, Xinping Liu, David J. Mancuso, Zhongdan Zhao, Shaoping Guan, Dana R. Abendschein, Xianlin Han, Richard W. Gross

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

Lipidomic regulation of mitochondrial cardiolipin content and molecular species composition is a prominent regulator of bioenergetic efficiency. However, the mechanisms controlling cardiolipin metabolism during health or disease progression have remained elusive. Herein, we demonstrate that cardiac myocyte-specific transgenic expression of cardiolipin synthase results in accelerated cardiolipin lipidomic flux that impacts multiple aspects of mitochondrial bioenergetics and signaling. During the postnatal period, cardiolipin synthase transgene expression results in marked changes in the temporal maturation of cardiolipin molecular species during development. In adult myocardium, cardiolipin synthase transgene expression leads to a marked increase in symmetric tetra-18:2 molecular species without a change in total cardiolipin content. Mechanistic analysis demonstrated that these alterations result from increased cardiolipin remodeling by sequential phospholipase and transacylase/acyltransferase activities in conjunction with a decrease in phosphatidylglycerol content. Moreover, cardiolipin synthase transgene expression results in alterations in signaling metabolites, including a marked increase in the cardioprotective eicosanoid 14,15-epoxyeicosatrienoic acid. Examination of mitochondrial bioenergetic function by high resolution respirometry demonstrated that cardiolipin synthase transgene expression resulted in improved mitochondrial bioenergetic efficiency as evidenced by enhanced electron transport chain coupling using multiple substrates as well as by salutary changes in Complex III and IV activities. Furthermore, transgenic expression of cardiolipin synthase attenuated maladaptive cardiolipin remodeling and bioenergetic inefficiency in myocardium rendered diabetic by streptozotocin treatment. Collectively, these results demonstrate the unanticipated role of cardiolipin synthase in maintaining physiologic membrane structure and function even under metabolic stress, thereby identifying cardiolipin synthase as a novel therapeutic target to attenuate mitochondrial dysfunction in diabetic myocardium.

Original languageEnglish (US)
Pages (from-to)25086-25097
Number of pages12
JournalJournal of Biological Chemistry
Volume287
Issue number30
DOIs
StatePublished - Jul 20 2012
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Kiebish, M. A., Yang, K., Sims, H. F., Jenkins, C. M., Liu, X., Mancuso, D. J., Zhao, Z., Guan, S., Abendschein, D. R., Han, X., & Gross, R. W. (2012). Myocardial regulation of lipidomic flux by cardiolipin synthase: Setting the beat for bioenergetic efficiency. Journal of Biological Chemistry, 287(30), 25086-25097. https://doi.org/10.1074/jbc.M112.340521