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Updated: Mar 18, 2026
Detection of microRNA Expression in Peritoneal Membrane of Rats Using Quantitative Real-time PCR
Published on: June 27, 2017
Direct Peritoneal Resuscitation Alters Hepatic miRNA Expression after Hemorrhagic Shock
Jessica L Weaver1, Paul J Matheson1, Ryan T Hurt2
1Department of Surgery, University of Louisville, Louisville, KY; Robley Rex Veterans Affairs Medical Center, Louisville, KY.
Background:
MicroRNAs (miRNAs) are small segments of noncoding RNA that regulate gene expression and protein function, and therefore are key regulators of cellular processes including those of the inflammatory cascade after hemorrhagic shock (HS). We have previously shown that direct peritoneal resuscitation (DPR), as an adjunct to traditional IV fluid resuscitation, improves visceral blood flow and reduces pro-inflammatory cytokines released during HS. The effects of DPR on hepatic miRNA (miR) expression patterns after resuscitated HS are not known.
Study Design:
Male Sprague-Dawley rats were divided into 3 groups: sham (no HS); conventional resuscitation (CR; HS, then resuscitated with shed blood and 2 volumes of saline); and DPR (CR plus 30 mL peritoneal dialysis solution). Animals were sacrificed at 4 hours, and miRNAs were measured using reverse transcription polymerase chain reaction.
Results:
Use of DPR downregulated 68 of 92 hepatic miRNAs compared with only 2 of 92 upregulated when compared with CR alone, p < 0.01). Specifically, miR-9-5p, miR-122-5p, and miR-146, which regulate NFκB, were downregulated 4.1-, 3.4-, and 0.86-fold, respectively; miR-29a and miR-126 were upregulated 0.88- and 3.7-fold when DPR was compared with CR.
Conclusions:
Adding DPR downregulated most hepatic miRNAs compared with CR alone. Some miRNAs were affected more significantly, suggesting that although this clinical intervention causes a near-global downregulation of hepatic miRNA, it still targets specific inflammatory pathways. Use of DPR for resuscitation of patients in HS may reduce hepatic inflammation to improve patient outcomes after hemorrhage.
Insights
Direct peritoneal resuscitation (DPR) significantly downregulates hepatic microRNAs (miRNAs) after hemorrhagic shock (HS). This suggests DPR may reduce liver inflammation and improve outcomes in HS patients.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- MicroRNAs (miRNAs) are crucial regulators of gene expression and cellular processes, including inflammation.
- Hemorrhagic shock (HS) triggers inflammatory responses, and hepatic miRNAs play a role in this cascade.
- Direct peritoneal resuscitation (DPR) is an adjunct therapy to conventional resuscitation (CR) that improves visceral blood flow and reduces pro-inflammatory cytokines in HS.
Purpose of the Study:
- To investigate the impact of DPR on hepatic miRNA expression patterns following resuscitated HS.
- To determine if DPR alters the expression of specific miRNAs involved in inflammatory pathways.
Main Methods:
- Male Sprague-Dawley rats underwent sham operation, CR, or CR with DPR (CR + peritoneal dialysis solution).
- Animals were sacrificed at 4 hours post-resuscitation.
- Hepatic miRNA expression was quantified using reverse transcription polymerase chain reaction (RT-PCR).
Main Results:
- DPR treatment resulted in the downregulation of 68 out of 92 hepatic miRNAs compared to CR alone (p < 0.01).
- Conversely, only 2 miRNAs were upregulated with DPR compared to CR.
- Specific miRNAs, including miR-9-5p, miR-122-5p, and miR-146 (regulating NFκB), were significantly downregulated with DPR.
Conclusions:
- Direct peritoneal resuscitation (DPR) broadly downregulates hepatic miRNA expression following hemorrhagic shock (HS).
- This global miRNA modulation suggests targeted effects on specific inflammatory pathways.
- DPR may serve as a therapeutic strategy to mitigate hepatic inflammation and enhance patient recovery after HS.
