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Phytol and peroxisome proliferation
Insights
Phytol, a phytanic acid precursor, promotes peroxisome proliferation in mice. This dietary intervention enhances metabolic capacity and alters lipid levels, offering insights into peroxisome function and related disorders.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Disorders
Background:
- Infantile Refsum's disease involves high phytanic acid and impaired hepatic peroxisomes.
- Phytol is a dietary precursor to phytanic acid.
Purpose of the Study:
- To investigate the in vivo effects of phytol on peroxisomes.
- To understand phytol's influence on metabolic pathways and organelle function.
Main Methods:
- Biochemical assays to measure enzyme activities.
- Morphological analysis of peroxisome proliferation.
- Dietary administration of phytol to adult mice.
Main Results:
- Phytol feeding led to hepatic peroxisome proliferation (5-fold increase in beta-oxidation).
- Increased acyl moiety exchange between peroxisomes and mitochondria (2-fold).
- Elevated catalase and butyryl-CoA dehydrogenase activities; decreased serum triglycerides.
Conclusions:
- Dietary phytol induces peroxisome proliferation and enhances metabolic functions in vivo.
- Phytol influences lipid metabolism and peroxisome activity in various tissues.
- Findings provide insights into phytanic acid metabolism and potential therapeutic strategies.
Abstract:
Infantile Refsum's disease is characterized by high levels of phytanic acid and the absence of normal hepatic peroxisomes. We investigated the in vivo influence of phytol, a precursor of phytanic acid, on peroxisomes by both biochemical and morphological methods. Enhanced supply of phytol in the diet of adult mice causes proliferation of hepatic peroxisomes. The peroxisomal beta-oxidizing capacity as well as exchanges of acyl moieties between peroxisomes and mitochondria are raised around 5- and 2-fold, respectively. In parallel a 1.5-fold increase of total catalase and mitochondrial butyryl-CoA dehydrogenase activities occurs, whereas peroxisomal urate oxidase and glycolate oxidase remain normally active. Serum triglyceride levels are decreased after 3 wk of phytol feeding; serum cholesterol levels remain unaffected. Phytol feeding also induces peroxisome proliferation in duodenal epithelium, in myocardium and in skin sebaceous glands, but not in kidney.