Sensitive method for measuring tissue alpha-tocopherol and alpha-tocopheryloxybutyric acid by high-performance liquid...

Area of Science:

• Biochemistry
• Pharmacology
• Analytical Chemistry

Background:

• Tocopherol analogs, d-alpha-tocopheryloxybutyric acid (TSE) and d-alpha-tocopheryl hemisuccinate (TS), exhibit anti-tumor properties.
• Understanding the in vivo behavior and distribution of these compounds is crucial for their therapeutic development.

Purpose of the Study:

• To develop and validate a sensitive high-performance liquid chromatography (HPLC) method for the simultaneous determination of TSE and alpha-tocopherol (alpha-T) in biological specimens.
• To investigate the accumulation of TSE and alpha-T in rat liver homogenates and HL-60 human leukemia cells after administration of TSE.

Main Methods:

• Development of a sensitive HPLC method with fluorometric detection for TSE and alpha-T analysis.
• Optimization of excitation (210 nm) and emission (300 nm) wavelengths for maximal sensitivity.
• Quantification using an internal standard (I.S.) method in biological matrices (rat liver homogenates, HL-60 cells).

Main Results:

• The developed HPLC method allows for sensitive and simultaneous determination of TSE and alpha-T.
• Administration of TSE-tris salt led to significant accumulation of TSE in rat liver homogenates and HL-60 cells.
• No significant accumulation of alpha-T was observed in either biological specimen following TSE treatment.

Conclusions:

• TSE, a nonhydrolysable tocopherol ether analog, selectively accumulates in liver and leukemia cells.
• The developed HPLC method is suitable for pharmacokinetic studies of tocopherol derivatives.
• Findings suggest differential cellular uptake and metabolism between TSE and endogenous alpha-T.