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Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
Published on: October 12, 2017
Induction of lipid peroxidation and decrease of antioxidant defenses in symptomatic and asymptomatic patients with
Marion Deon1, Angela Sitta, Alethea G Barschak
1Serviço de Genética Médica, HCPA, Porto Alegre, RS, Brazil. marion_deon@yahoo.com.br
Summary
Oxidative stress and lipid peroxidation increase in X-linked adrenoleukodystrophy (X-ALD) patients, with higher levels in adrenomyeloneuropathy (AMN) and childhood cerebral (CCER) forms. Asymptomatic patients show normal antioxidant defenses, suggesting other factors influence X-ALD symptom severity.
Area of Science:
- Biochemistry
- Genetics
- Neurology
Background:
- X-linked adrenoleukodystrophy (X-ALD) involves demyelination and adrenal insufficiency due to very long chain fatty acid accumulation.
- X-ALD presents diverse clinical phenotypes, including childhood cerebral (CCER), adrenomyeloneuropathy (AMN), and asymptomatic forms.
- Previous research indicated oxidative stress in symptomatic X-ALD patients.
Purpose of the Study:
- To compare oxidative stress markers in plasma from CCER, AMN, and asymptomatic X-ALD patients.
- To investigate the role of lipid peroxidation and antioxidant status in X-ALD pathophysiology.
- To explore potential differences in oxidative stress between symptomatic and asymptomatic X-ALD individuals.
Main Methods:
- Measurement of thiobarbituric acid reactive substances (TBA-RS) as a marker of lipid peroxidation.
- Assessment of total antioxidant status (TAS) in patient plasma samples.
- Comparison of oxidative stress parameters across different X-ALD clinical variants (CCER, AMN, asymptomatic).
Main Results:
- Symptomatic and asymptomatic X-ALD patients exhibited significantly elevated plasma TBA-RS, indicating increased lipid peroxidation.
- Lipid peroxidation levels were notably higher in AMN patients compared to CCER and asymptomatic groups.
- Total antioxidant status (TAS) was reduced in symptomatic X-ALD patients but remained normal in asymptomatic individuals.
Conclusions:
- Elevated lipid peroxidation is a characteristic of both symptomatic and asymptomatic X-ALD.
- Asymptomatic X-ALD patients appear protected by normal antioxidant defenses, suggesting other pathogenic factors contribute to symptom severity.
- Further research is needed to identify factors beyond oxidative damage that drive X-ALD symptom progression.
