Mitochondrial dysfunction in alcoholic patients as assessed by breath analysis

Area of Science:

• Hepatology
• Mitochondrial Biology
• Biochemistry

Background:

• Mitochondrial abnormalities are observed in alcoholic liver disease.
• In vitro studies show ethanol-induced mitochondrial dysfunction.
• The in vivo relevance of these findings remains unclear.

Purpose of the Study:

• To assess mitochondrial function noninvasively in alcoholic subjects using a breath test.
• To determine if impaired mitochondrial function is specific to excessive ethanol consumption.

Main Methods:

• Utilized the 2-keto[1-14C]isocaproic acid breath test to measure mitochondrial decarboxylation.
• Compared results in 17 alcoholic subjects with healthy controls and patients with nonalcoholic liver disease.
• Assessed conventional and quantitative liver function using aminopyrine breath test and galactose elimination capacity.

Main Results:

• Alcoholic patients exhibited significantly lower 14CO2 exhalation and 2-keto[1-14C]isocaproic acid decarboxylation compared to controls.
• Impaired decarboxylation was observed despite normal aminopyrine breath test and galactose elimination capacity.
• This indicates the impairment is not solely due to reduced functional liver mass.

Conclusions:

• Mitochondrial function, assessed by 2-keto[1-14C]isocaproic acid decarboxylation, is impaired in chronic alcoholic patients.
• The observed functional impairment is specific to excessive ethanol consumption, not general liver dysfunction or cirrhosis.
• The 2-keto[1-14C]isocaproic acid breath test may serve as a valuable marker for excessive alcohol intake.