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Nrf2 stabilization prevents critical oxidative damage in Down syndrome cells

Emiliano Zamponi1, Nahuel Zamponi2, Pinar Coskun3

  • 1Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Cordoba, Argentina.

Aging Cell
|July 21, 2018
PubMed

Insights

Down syndrome cells rely on the Nrf2 pathway to combat oxidative stress and aging. Targeting mitochondria with catalase (mCAT) reduced oxidative damage and made the Nrf2 pathway less critical for cell health.

Area of Science:

  • Cellular Biology
  • Aging Research
  • Genetics

Background:

  • Chronic oxidative stress accelerates aging and is a hallmark of Down syndrome (DS).
  • DS cells exhibit elevated reactive oxygen species (ROS) and mitochondrial dysfunction.
  • The Nrf2 pathway normally protects cells by transcribing antioxidant response elements (ARE).

Purpose of the Study:

  • To investigate the role of Nrf2 pathway activation in DS cellular homeostasis.
  • To evaluate the therapeutic potential of mitochondria-targeted catalase (mCAT) in DS models.

Main Methods:

  • Studied caspase 3/PKCδ-dependent Nrf2 activation in DS and Dp16 mouse model cells.
  • Administered mitochondria-targeted catalase (mCAT) to DS cells.
  • Assessed oxidative stress markers, mitochondrial function, and cellular repair capacities.

Main Results:

  • Nrf2 pathway activation was crucial for protecting DS cells from oxidative damage and maintaining function.
  • mCAT treatment significantly reduced oxidative stress and improved mitochondrial structure and function.
  • mCAT normalized cellular replicative and wound healing capacities in DS cells.
  • mCAT intervention rendered the Nrf2-mediated antioxidant response non-essential.

Conclusions:

  • The Nrf2/ARE pathway is vital for maintaining cellular homeostasis in Down syndrome.
  • Mitochondrial-targeted interventions show promise as antioxidant and anti-aging therapies for DS.
Keywords:
Down syndromeDp16Nrf2PKCδmitochondrial catalaseoxidative stress

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