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AKIP1 expression modulates mitochondrial function in rat neonatal cardiomyocytes.

Hongjuan Yu1, Wardit Tigchelaar, Debby P Y Koonen

  • 1Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands ; Department of Hematology, the First Affiliated Hospital of Harbin Medical University, Harbin, China.

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Summary

A kinase interacting protein 1 (AKIP1) enhances mitochondrial respiration and ATP production in cardiomyocytes. AKIP1 upregulation may be an adaptive mechanism protecting the heart during cardiac stress.

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Area of Science:

  • Cardiology
  • Mitochondrial Biology
  • Molecular Signaling

Background:

  • A kinase interacting protein 1 (AKIP1) regulates protein kinase A and NF-κB signaling.
  • AKIP1 is implicated in cardiac stress response and localized to cardiomyocyte mitochondria.
  • The precise mitochondrial function of AKIP1 remains largely unknown.

Purpose of the Study:

  • To investigate the role of AKIP1 in mitochondrial function within a neonatal cardiomyocyte model of phenylephrine-induced hypertrophy.
  • To determine if AKIP1 influences mitochondrial respiration and oxidative stress.

Main Methods:

  • Neonatal rat cardiomyocytes were subjected to phenylephrine (PE) treatment.
  • AKIP1 was silenced or overexpressed using genetic techniques.
  • Mitochondrial oxygen consumption rate (OCR) and ATP production were measured using a Seahorse flux analyzer.
  • Mitochondrial superoxide production was assessed.

Main Results:

  • PE-induced increase in cardiomyocyte OCR was partially dependent on AKIP1 induction.
  • AKIP1 overexpression alone significantly increased mitochondrial OCR, particularly ATP-linked OCR, independent of glycolytic flux.
  • Increased OCR was not due to mitochondrial biogenesis, altered ETC density, or membrane potential changes.
  • AKIP1 modulated electron transport chain (ETC) coupling efficiency and reduced mitochondrial superoxide production.

Conclusions:

  • AKIP1 overexpression enhances mitochondrial respiration and ATP production without increasing oxidative stress.
  • AKIP1 plays a role in mitochondrial stress adaptation in cardiomyocytes.
  • Upregulation of AKIP1 during cardiac stress may serve as a protective adaptive mechanism for the heart.