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August 13, 2026CirculationOpen Access

MCU upregulation counteracts stress-induced cardiac remodeling by preserving calcium homeostasis and cardiomyocyte viability.

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Why the study?

Impaired calcium homeostasis damages mitochondria and promotes pathological cardiac remodeling, but the regulation and role of the mitochondrial calcium uniporter under chronic stress remained unclear.

Population

MCU knockout or transgenic mice and primary cultured rodent adult cardiomyocytes

Comparison

MCU knockout vs transgenic mice with isoproterenol infusion, alongside in vitro treatments

Design

In vivo and in vitro animal experimental study

Follow-up

4 weeks

Key result

MCU upregulation counteracts stress-induced pathological cardiac remodeling by preserving calcium homeostasis and cardiomyocyte viability.

Discussion

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Overview

Hypothesis-generating for CaMKIIδB-MCU upregulation limiting stress remodeling in mice; leaves open human translation.

Key Points

  • To investigate the regulation and protective role of the mitochondrial Ca 2+ uniporter (MCU) in pathological cardiac remodeling caused by chronic stress.
  • MCU knockout and transgenic mice infused with isoproterenol (10 mg/kg per day for 4 weeks) to evaluate cardiac remodeling.
  • Echocardiography and histology assessed cardiac hypertrophy; intracellular Ca 2+ handling was monitored in cultured cardiomyocytes treated with isoproterenol.
  • Adenovirus-mediated gene manipulations performed in vitro to study implications of MCU regulation.
  • ISO increased MCU levels and mitochondrial Ca 2+ concentrations, exacerbating cardiac hypertrophy and dysfunction in MCU knockout mice.
  • Defective intracellular Ca 2+ handling and activation of cell death pathways were observed in cardiomyocytes lacking MCU or overexpressing dominant negative MCU.
  • Cardiac-specific overexpression of MCU preserved Ca 2+ homeostasis and prevented ISO-induced cardiac hypertrophy.

Structured PICO

P
Population
MCU knockout or transgenic mice, and primary cultured rodent adult cardiomyocytes
I
Intervention
Isoproterenol infusion (10 mg/kg per day for 4 weeks in vivo; 1 nmol/L for 48 hours in vitro) and MCU genetic manipulation (knockout or overexpression)
C
Comparator
Wild-type mice or control cardiomyocytes (implied)
O
Outcome
Cardiac hypertrophy and remodeling (evaluated by echocardiography and histology), intracellular Ca2+ handling, and cell death pathwayssurrogate

MCU upregulation via the β-adrenergic receptor/CaMKIIδB/CREB pathway serves as a compensatory mechanism to counteract stress-induced pathological cardiac remodeling.

Cite This Study

A 2022 study studied Pathological cardiac remodeling. MCU knockout or overexpression was evaluated on Cardiac hypertrophy and remodeling. MCU upregulation counteracts stress-induced pathological cardiac remodeling by preserving calcium homeostasis and cardiomyocyte viability.

synapsesocial.com/papers/6a7de0661c0f4dfc2773ca72https://doi.org/10.1161/circulationaha.121.055841
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