Optimization of cytokine stability in stored amniotic fluid

Area of Science:

• Biochemistry
• Reproductive Biology
• Clinical Chemistry

Background:

• Amniotic fluid analysis is crucial for outcome-based research.
• Optimal storage methods for amniotic fluid samples are not well-established.
• Cytokine stability in stored samples impacts research accuracy.

Purpose of the Study:

• To evaluate the stability of key cytokines in amniotic fluid.
• To determine the effect of different storage temperatures on cytokine integrity.
• To assess the utility of a protease inhibitor in preserving cytokine levels.

Main Methods:

• Amniotic fluid samples were collected from patients undergoing genetic amniocentesis.
• Samples were stored for one year at 4°C, -20°C, and -80°C.
• Aprotinin (protease inhibitor) was used with select samples to evaluate its effect on cytokine stability.

Main Results:

• Cytokine levels (angiogenin, IL-6, VEGF) were significantly affected by storage temperature.
• Lowest cytokine levels were observed at 4°C, with highest levels at -80°C.
• Aprotinin improved the stability of angiogenin across all tested temperatures.

Conclusions:

• Cytokine degradation occurs in amniotic fluid stored above -80°C.
• Freezing at -80°C is recommended for long-term amniotic fluid sample storage.
• Protease inhibitors can mitigate degradation for specific cytokines.