Ethanol withdrawal hastens the aging of cytochrome c oxidase

Eunsun Jung, Xiaohua Ju, Daniel B. Metzger, James W. Simpkins

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We investigated whether abrupt ethanol withdrawal (EW) age-specifically inhibits a key mitochondrial enzyme, cytochrome c oxidase (COX), and whether estrogen mitigates this problem. We also tested whether this possible effect of EW involves a substrate (cytochrome c) deficiency that is associated with proapoptotic Bcl2-associated X protein (BAX) and mitochondrial membrane swelling. Ovariectomized young, middle age, and older rats, with or without 17β-estradiol (E2) implantation, underwent repeated EW. Cerebelli were collected to measure COX activity and the mitochondrial membrane swelling using spectrophotometry and the mitochondrial levels of cytochrome c and BAX using an immunoblot method. The loss of COX activity and the mitochondrial membrane swelling occurred only in older rats under control diet conditions but occurred earlier, starting in the young rats under EW conditions. E2 treatment mitigated these EW effects. EW increased mitochondrial BAX particularly in middle age rats but did not alter cytochrome c. Collectively EW hastens but E2 delays the age-associated loss of COX activity. This EW effect is independent of cytochrome c but may involve the mitochondrial overload of BAX and membrane vulnerability.

Original languageEnglish
Pages (from-to)618.e21-618.e32
JournalNeurobiology of Aging
Volume33
Issue number3
DOIs
StatePublished - 1 Jan 2012

Fingerprint

Electron Transport Complex IV
Ethanol
bcl-2-Associated X Protein
Mitochondrial Swelling
Cytochromes c
Mitochondrial Membranes
Oxidoreductases
Spectrophotometry
Mitochondrial Proteins
Estradiol
Estrogens
Diet
Membranes
Enzymes

Keywords

  • 17β-estradiol
  • Age
  • BAX (Bcl2-associated X protein)
  • Brain aging
  • Cytochrome c
  • Cytochrome c oxidase
  • Ethanol withdrawal
  • Female rats
  • Mitochondria
  • Mitochondrial membrane swelling
  • Mitochondrial respiration

Cite this

Jung, Eunsun ; Ju, Xiaohua ; Metzger, Daniel B. ; Simpkins, James W. / Ethanol withdrawal hastens the aging of cytochrome c oxidase. In: Neurobiology of Aging. 2012 ; Vol. 33, No. 3. pp. 618.e21-618.e32.
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Ethanol withdrawal hastens the aging of cytochrome c oxidase. / Jung, Eunsun; Ju, Xiaohua; Metzger, Daniel B.; Simpkins, James W.

In: Neurobiology of Aging, Vol. 33, No. 3, 01.01.2012, p. 618.e21-618.e32.

Research output: Contribution to journalArticle

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