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Related Experiment Videos

Age-related changes in apolipoprotein A-I expression

G N Shah1, N C Wong, A D Mooradian

  • 1St. Louis V.A. Medical Center, MO, USA.

Biochimica Et Biophysica Acta
|December 7, 1995
PubMed
Summary

Aging increases apolipoprotein A-I (ApoA1) levels in rats due to higher hepatic mRNA and potentially reduced clearance. Despite lower synthesis rates in aged rats, plasma ApoA1 concentrations rise significantly with age.

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Area of Science:

  • Biochemistry
  • Gerontology
  • Molecular Biology

Background:

  • Apolipoprotein A-I (ApoA1) is crucial for cholesterol transport.
  • Understanding age-related changes in ApoA1 is vital for metabolic health research.

Purpose of the Study:

  • To investigate age-dependent alterations in apolipoprotein A-I (ApoA1) expression and synthesis in male Fischer 344 rats.

Main Methods:

  • Immunoblot analysis of plasma ApoA1.
  • Quantification of hepatic ApoA1 mRNA levels.
  • In vitro translation assays.
  • Nuclear run-off assays for gene transcription.
  • [14C]leucine incorporation for in vivo synthesis rates.

Main Results:

  • Plasma ApoA1 concentrations were significantly higher in 12- and 26-month-old rats compared to 4-month-old rats.
  • Hepatic ApoA1 mRNA levels were approximately 2-fold higher in aged rats.
  • In vivo ApoA1 synthesis rates were reduced in aged rats, suggesting metabolic changes rather than mRNA issues.
  • Gene transcription rates decreased with age, implying reduced mRNA turnover contributes to higher hepatic mRNA.

Conclusions:

  • The age-related increase in plasma ApoA1 is likely due to reduced metabolic clearance or increased intestinal synthesis.
  • Hepatic ApoA1 mRNA accumulation in aged rats may result from decreased mRNA turnover.
  • Aging affects ApoA1 metabolism through complex regulatory mechanisms impacting both synthesis and clearance.

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