PON1 enzyme activity assays for serum and heparinized plasma in horses and stability evaluation of the enzyme activity over different freeze-thaw cycles and mimic transportation.

This research study explores the effects of storage conditions (temperature and duration) and mimic transportation on the activity of PON1 (Paraoxonase and Arylesterase) enzymes in horse blood. Findings reveal that these factors significantly influence enzyme activity, with the potential to lead to protein degradation.

Study Overview

• The study primarily focuses on understanding how storage conditions and transportation influence the activity of PON1 enzymes in serum and heparinized plasma in horses.
• The researchers point out that there’s limited standardization procedures concerning the time of storage for frozen samples and their impact on enzyme activity.

Evaluation and Testing

• The experiment was conducted under different storage temperatures (-20 °C and -80 °C), involved three repetitive freeze/thaw cycles, and a 24-hour mimic transportation period.
• The activity of PON1 enzymes, which are critical in the protection and detoxification processes of reactive molecules, was then evaluated under these conditions.

Findings

• The activities of both paraoxonase and arylesterase enzymes were found to be significantly altered depending on the storage conditions and time.
• These conditions were shown to potentially cause protein degradation or other alterations.
• Specifically, both paraoxonase and arylesterase activities significantly decreased among storage temperatures, with the most significant effects seen at -20 °C.

Impact of Freezing and Transportation Conditions

• The results showed that repeated freeze/thaw cycles at -20 °C and 24-hour mimic transport conditions led to the degradation of arylesterase in both serum and heparinized plasma.
• Conversely, freeze/thaw cycles at -80 °C caused an increase in both arylesterase and paraoxonase activities in both types of samples.
• The research showed similar responses of enzyme activity between serum and heparinized plasma.