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Related Experiment Videos

Mitochondrial complex I defects in aging

G Lenaz1, C Bovina, C Castelluccio

  • 1Dipartimento di Biochimica G. Moruzzi, University of Bologna, Italy.

Molecular and Cellular Biochemistry
|October 6, 1997
PubMed
Summary
This summary is machine-generated.

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Aging impacts NADH Coenzyme Q reductase (Complex I) activity, particularly in mitochondria. Subtle kinetic changes, not just overall activity loss, may indicate aging effects and serve as biomarkers.

Area of Science:

  • Biochemistry
  • Gerontology
  • Molecular Biology

Background:

  • The mitochondrial theory of aging posits that mitochondrial enzymes are significantly affected by aging.
  • NADH Coenzyme Q reductase (Complex I) is a key mitochondrial enzyme encoded by mitochondrial DNA, making it a candidate for age-related decline.
  • Subtle kinetic alterations in Complex I, such as changes in quinone affinity or inhibition sensitivity, may precede detectable overall activity loss during aging.

Purpose of the Study:

  • To investigate the impact of aging on NADH Coenzyme Q reductase (Complex I) activity in various tissues.
  • To evaluate different methods for assessing Complex I activity in aged organisms.
  • To identify potential biomarkers of aging and age-related diseases related to Complex I function.

Main Methods:

Related Experiment Videos

  • Assessing overall Complex I activity in tissues from aged rats using direct assays with artificial quinone acceptors.
  • Calculating Complex I activity using the 'pool equation' based on aerobic NADH oxidation for a more accurate assessment.
  • Analyzing NADH oxidation and rotenone sensitivity in synaptic and nonsynaptic mitochondria from aged rat brain cortex.
  • Measuring Complex I activity and rotenone inhibition titre in human platelet membranes from aged individuals.

Main Results:

  • Overall Complex I activity was decreased in several tissues from aged rats.
  • Direct assays may underestimate Complex I activity; the 'pool equation' revealed a greater decrease in aged animals.
  • Nonsynaptic mitochondria showed decreased NADH oxidation and rotenone sensitivity, unlike synaptic mitochondria.
  • Human platelet membranes from aged individuals showed unchanged Complex I activity but an increased rotenone half-inhibition titre.

Conclusions:

  • Aging leads to a significant decline in Complex I activity, which may be underestimated by direct assays.
  • The 'pool equation' provides a more accurate measure of age-related Complex I dysfunction.
  • Changes in rotenone sensitivity in human platelets may serve as a reliable biomarker for aging and age-related conditions.