A simplified method for preventing postmortem alterations of brain prostanoids for true in situ level quantification

Area of Science:

• Neuroscience
• Biochemistry
• Analytical Chemistry

Background:

• Postmortem prostanoid (PG) synthesis in the brain creates analytical artifacts.
• Accurate in situ endogenous PG quantification requires enzyme deactivation.
• Current gold standard microwave (MW) irradiation fixation is costly and lacks reproducibility.

Purpose of the Study:

• To develop and validate a simple, reproducible, and inexpensive method to prevent postmortem PG increase.
• To assess boiling as an alternative tissue fixation technique for PG analysis.
• To compare PG levels in unfixed, MW-fixed, and boiled brain tissues.

Main Methods:

• Mice were decapitated directly into boiling saline for tissue fixation.
• Brain temperature and PG synthesis inhibition were monitored during boiling.
• Basal and lipopolysaccharide (LPS)-induced PG levels were analyzed in unfixed, MW-fixed, and boiled brain tissues.

Main Results:

• Three minutes of boiling effectively prevented postmortem PG synthesis.
• PG levels in boiled brains were comparable to MW-fixed brains.
• Unfixed tissues showed significant postmortem PG increase, particularly under basal conditions.

Conclusions:

• Boiling is a viable, cost-effective, and accessible method for preventing postmortem PG alterations.
• This technique enables reproducible and accurate endogenous PG quantification.
• Boiling offers a practical alternative to MW irradiation for brain tissue fixation in PG studies.