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Sepsis gene expression profiling: murine splenic compared with hepatic responses determined by using complementary
J Perren Cobb1, Jason M Laramie, Gary D Stormo
1Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA. cobb@msnotes.wustl.edu
Critical Care Medicine
|December 17, 2002
Summary
This study used DNA microarrays to profile gene expression in mice with sepsis, revealing tissue-specific changes and identifying novel genes involved in the inflammatory response.
Area of Science:
- Genomics
- Molecular Biology
- Immunology
Background:
- DNA microarrays enable genome-wide assessment of messenger RNA abundance, crucial for monitoring gene expression.
- Sepsis, a life-threatening condition, requires a deeper understanding of its molecular underpinnings.
Purpose of the Study:
- To gain experience in sepsis gene expression profiling using a murine polymicrobial abdominal sepsis model.
- To characterize the sepsis transcriptome and identify key genes involved in the host response.
Main Methods:
- A prospective animal study was conducted using C57BL/6 mice.
- Polymicrobial sepsis was induced via cecal ligation and puncture; sham laparotomy served as control.
- Spleen and liver tissues were collected 24 hours post-procedure for gene expression analysis using complementary DNA microarrays targeting 588 genes.
Main Results:
- Gene expression profiles of septic liver and spleen showed minimal overlap, highlighting organ-specific responses.
- Many identified genes are linked to inflammatory response regulation, with some novel associations found.
- Hierarchical clustering revealed coordinated gene expression in spleen affecting cell signaling and survival pathways, consistent with sepsis-induced apoptosis.
Conclusions:
- Microarray technology offers a powerful method for analyzing sepsis-induced, tissue-specific gene expression changes in animal models.
- This study represents the first report using microarrays to define the sepsis transcriptome.