New insights into the role of mitochondrial dynamics and autophagy during oxidative stress and aging in the heart

Yoshiyuki Ikeda, Sebastiano Sciarretta, Narayani Nagarajan, Speranza Rubattu, Massimo Volpe, Giacomo Frati, Junichi Sadoshima

Research output: Contribution to journalArticle

Abstract

The heart is highly sensitive to the aging process. In the elderly, the heart tends to become hypertrophic and fibrotic. Stiffness increases with ensuing systolic and diastolic dysfunction. Aging also affects the cardiac response to stress. At the molecular level, the aging process is associated with accumulation of damaged proteins and organelles, partially due to defects in protein quality control systems. The accumulation of dysfunctional and abnormal mitochondria is an important pathophysiological feature of the aging process, which is associated with excessive production of reactive oxygen species. Mitochondrial fusion and fission and mitochondrial autophagy are crucial mechanisms for maintaining mitochondrial function and preserving energy production. In particular, mitochondrial fission allows for selective segregation of damaged mitochondria, which are afterward eliminated by autophagy. Unfortunately, recent evidence indicates that mitochondrial dynamics and autophagy are progressively impaired over time, contributing to the aging process. This suggests that restoration of these mechanisms could delay organ senescence and prevent age-associated cardiac diseases. Here, we discuss the current understanding of the close relationship between mitochondrial dynamics, mitophagy, oxidative stress, and aging, with a particular focus on the heart.

Original languageEnglish
Article number210934
JournalOxidative Medicine and Cellular Longevity
Volume2014
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Cell Biology
  • Ageing
  • Biochemistry
  • Medicine(all)

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