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Related Experiment Videos

Mitochondrial dysfunction in the senescence accelerated mouse (SAM)

H Nakahara1, T Kanno, Y Inai

  • 1Institute of Medical Science, Center for Adult Diseases, Kuraashiki, Japan.

Free Radical Biology & Medicine
|January 22, 1998
PubMed
Summary
This summary is machine-generated.

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Mitochondrial dysfunction, including impaired energy production and calcium uptake, accelerates aging in senescence accelerated mice (SAMP8). These age-related changes in mitochondria may contribute to their shorter lifespan.

Area of Science:

  • Mitochondrial biology
  • Aging research
  • Cellular metabolism

Background:

  • Oxidative stress and damage to cellular components like DNA, proteins, and lipids are implicated in the aging process.
  • Mitochondria play a crucial role in cellular energy production and are susceptible to oxidative damage.

Purpose of the Study:

  • To investigate mitochondrial oxidative phosphorylation and function in senescence accelerated mice (SAMP8) compared to a resistant substrain (SAMR1).
  • To explore the relationship between mitochondrial dysfunction and the accelerated aging phenotype in SAMP8 mice.

Main Methods:

  • Estimation of oxidative phosphorylation in liver mitochondria from SAMP8 and SAMR1 mice at various ages.
  • Measurement of respiratory control ratio and ADP/O index to assess mitochondrial efficiency.

Related Experiment Videos

  • Assessment of dinitrophenol-dependent uncoupled respiration and calcium uptake in mitochondria.
  • Analysis of Bcl-x protein levels in liver mitochondria.

    • Main Results:

    • Liver mitochondria from aging SAMP8 mice showed decreased respiratory control ratio and ADP/O, indicating insufficient ATP synthesis.
    • A marked decrease in uncoupled respiration and dysfunctional calcium uptake were observed in aged SAMP8 liver mitochondria.
    • Similar, though milder, functional declines were noted in SAMR1 mice, with heart mitochondria in SAMP8 also showing dysfunction.
    • A slight decrease in Bcl-x protein was observed in SAMP8 liver mitochondria.

    Conclusions:

    • Mitochondrial dysfunction, characterized by impaired energy transfer and calcium handling, is evident in senescence accelerated mice.
    • These age-related mitochondrial functional deficits in SAMP8 mice are likely associated with their accelerated aging and shorter lifespan.