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Postmortem RNA and protein stability in perinatal human lungs
Monique E De Paepe1, Quanfu Mao, Carol Huang
1Department of Pathology, Women and Infants' Hospital, Providence, RI 02905, USA. mdepaepe@wihri.org
Summary
Preserving fetal and neonatal lung tissue using RNA yields superior RNA and protein for molecular analysis compared to liquid nitrogen freezing. This method is effective even with prolonged postmortem intervals in live-born or nonmacerated stillborn infants.
Area of Science:
- Perinatal pathology
- Molecular biology
- Human lung development
Background:
- Fetal and neonatal lung tissue are crucial for studying human lung development.
- Effective tissue preservation methods are essential for molecular analysis.
Purpose of the Study:
- To compare the efficacy of RNA preservation versus liquid nitrogen freezing for perinatal lung tissue.
- To assess RNA and protein yield and integrity for molecular analyses.
Main Methods:
- Investigated mRNA and protein stability in perinatal lung tissues.
- Compared RNA preservation and liquid nitrogen (LN) freezing.
- Analyzed RNA integrity via spectrophotometry and gel electrophoresis.
- Assessed protein integrity using Western blot analysis.
Main Results:
- RNA preservation yielded more total RNA and protein than LN freezing.
- Both methods provided equivalent RNA integrity suitable for RT-PCR.
- Protein integrity was also equivalent between methods.
- Tissue from live-born or nonmacerated stillborn infants yielded suitable RNA and protein.
- Postmortem interval up to 41 hours did not affect yield or integrity.
Conclusions:
- RNA preservation is equivalent or superior to LN freezing for preserving postmortem human lung tissue.
- High-quality RNA and protein can be obtained from live-born and nonmacerated stillborn infants.
- This enables routine molecular analyses of developing human lungs.