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Elevated MCU Expression by CaMKIIδB Limits Pathological Cardiac Remodeling.

Pei Wang1, Shangcheng Xu1, Jiqian Xu1

  • 1Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine (P.W., S.X., J.X., Y.X., H.Z., B.Z., R.T., W.W.), University of Washington, Seattle.

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|February 15, 2022
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Summary

Upregulating the mitochondrial calcium uniporter (MCU) protects the heart from stress-induced damage. This compensatory mechanism preserves calcium balance and cardiomyocyte survival, preventing heart failure.

Keywords:
calcium channelcalcium-calmodulin–dependent protein kinasecardiac hypertrophycardiomyocytesheart mitochondriaβ-adrenergic receptor

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Area of Science:

  • Cardiovascular Biology
  • Mitochondrial Physiology
  • Cardiac Pathophysiology

Background:

  • Calcium (Ca2+) is crucial for cellular energy metabolism.
  • Mitochondrial Ca2+ overload contributes to heart failure by damaging cardiomyocytes.
  • The mitochondrial Ca2+ uniporter (MCU) plays a key role in regulating mitochondrial Ca2+ uptake.

Purpose of the Study:

  • To investigate the regulation of the mitochondrial Ca2+ uniporter (MCU) under chronic stress.
  • To determine the role of MCU in pathological cardiac remodeling induced by beta-adrenergic stimulation.
  • To elucidate the signaling pathways involved in MCU regulation during cardiac stress.

Main Methods:

  • Utilized MCU knockout and transgenic mouse models.
  • Administered isoproterenol (ISO) to induce chronic cardiac stress in vivo and in vitro.
  • Assessed cardiac function, hypertrophy, fibrosis, and cardiomyocyte death.
  • Employed adenovirus-mediated gene manipulation in cultured cardiomyocytes.

Main Results:

  • Isoproterenol (ISO) increased MCU levels and mitochondrial Ca2+ uptake in cardiac mitochondria.
  • Mice lacking MCU exhibited exacerbated cardiac hypertrophy, fibrosis, and cardiomyocyte death upon ISO treatment.
  • Overexpression of MCU preserved cardiac function and prevented ISO-induced heart remodeling.
  • Identified the Ca2+/calmodulin kinase II deltaB (CaMKIIδB)/CREB pathway as a key regulator of MCU gene expression.

Conclusions:

  • The beta-adrenergic receptor/CaMKIIδB/CREB pathway upregulates MCU expression in the heart.
  • Increased MCU levels serve as a compensatory mechanism against pathological cardiac remodeling.
  • Maintaining mitochondrial Ca2+ homeostasis via MCU is vital for cardiomyocyte survival and cardiac function under stress.