Differential proteome analysis of the preeclamptic placenta using optimized protein extraction
Magnus Centlow1, Stefan R Hansson, Charlotte Welinder
1Department of Obstetrics & Gynecology, Lund University, BMC C14, 22184 Lund, Sweden.
Journal of Biomedicine & Biotechnology
|September 17, 2009
Summary
This study optimized protein extraction from human placenta, a challenging tissue due to lipids and glycogen. The developed protocol improves proteomic analysis, revealing accumulated apolipoprotein A1 in preeclamptic placentas.
Area of Science:
- Proteomics
- Biochemistry
Background:
- Human placenta presents challenges for proteomic analysis due to high lipid and glycogen content.
- Lipids and glycogen interfere with isoelectric focusing, a key step in two-dimensional polyacrylamide gel electrophoresis (2D-PAGE).
Purpose of the Study:
- To develop an optimized sample preparation protocol for placental proteins to enhance 2D-PAGE separation.
- To identify key steps for improving proteomic analysis of placental tissue.
Main Methods:
- Investigated two solubilization buffers: urea/CHAPS and Hepes.
- Evaluated six different precipitation methods.
- Assessed the impact of glycogen removal by centrifugation on proteome maps.
Main Results:
- Solubilization with urea/CHAPS combined with dichloromethane/methanol or acidified acetone precipitation yielded optimal results.
- Glycogen removal via centrifugation was critical for effective protein separation.
- The optimized protocol was applied to clinical samples, identifying apolipoprotein A1 accumulation in preeclamptic placentas.
Conclusions:
- An optimized protocol for placental protein preparation was successfully developed, overcoming lipid and glycogen interference.
- The findings suggest apolipoprotein A1 accumulation in preeclamptic placentas may have functional implications.
- This work facilitates more accurate proteomic studies of placental tissue and disease states.
