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Elevated oxygen consumption rate in response to acute low-glucose stress: Metformin restores rate to normal level

Emmanuel D Williams1, Steven C Rogers1, Xiaomin Zhang1

  • 1Donald W. Reynolds Institute on Aging and Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States.

Experimental Gerontology
|August 11, 2015
PubMed

Insights

Metformin helps manage blood glucose levels in older adults by restoring cellular oxygen consumption during low-glucose stress. This finding sheds light on hypoglycemia mechanisms and potential therapeutic strategies for cardiovascular disease.

Area of Science:

  • Gerontology
  • Metabolic research
  • Cardiovascular disease

Background:

  • Cardiovascular disease (CVD) is the leading cause of death in the US, especially in older adults.
  • Hyperglycemia is linked to premature age-related diseases, including CVD.
  • Hypoglycemia poses treatment challenges in elderly patients with high blood glucose, and its molecular mechanisms are unclear.

Purpose of the Study:

  • To investigate the mitochondrial metabolic response to short-term and long-term low-glucose stress.
  • To determine the effect of metformin on cellular metabolism under glucose stress.

Main Methods:

  • Mitochondrial metabolic profiling was performed.
  • Cells were subjected to short-term (up to 6 hours) and longer-term (12-24 hours) low-glucose stress.
  • The impact of metformin, a mitochondrial complex I inhibitor, was assessed.

Main Results:

  • Metformin normalized elevated oxygen consumption rates during short-term glucose stress.
  • This normalization restored oxygen consumption to levels seen in normal glucose conditions.
  • The effect of metformin was partly attributed to the activation of 5' AMP-activated protein kinase (AMPK).

Conclusions:

  • Metformin can mitigate metabolic dysregulation caused by short-term glucose stress.
  • AMPK activation may play a role in metformin's beneficial effects on cellular metabolism during hypoglycemia.
  • Understanding these mechanisms is crucial for managing CVD and age-related diseases in elderly populations.

Keywords:
Glucose stressMetforminMitochodria

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